US3923099A
Expired / Lapsed
US
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Methods of well completion or workover of fluid containing subsurface formations
Assignee: NA Hardin 1977 Trust
•
Filing: 1975-03-27
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Granted: 1975-12-02
•
Expires: 1995-03-27
Abstract
Abstract The invention relates to well completion or workover of fluid containing subsurface formations by packing off that portion of the well bore adjacent the fluid containing formation from the well bore above this formation and thereafter creating a low pressure void in the packed off portion so as to cause a surge of fluid from the formation into the created low pressure void. This low pressure void impressed upon the fluid containing subsurface formation may be utilized as a source of seismic energy for delineating the type of fluid or formation existing in the subsurface formations adjacent to or surrounding the well bore.
Inventors
- 👤 Clarence W Brandon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:19
CPC Classifications
E; E21; E21B; E21B37/00; E21B37/10; E21B43/00; E21B43/25; E21B43/26; E21B43/263
Claims Analysis
Total Claims: 49
Claim 1
Independent Claim
149 words
A METHOD OF WELL COMPLETION OR WORKOVER OF OIL, GAS OR OTHER FLUID CONTAINING SUBSURFACE FORMATIONS INTO WHICH A WELL BORE HAS BEEN DRILLED, WHICH COMPRISES THE STEP OF PACKING OFF SAID FLUID CONTAINING SUBSURFACE FORMATION FROM SAID WELL BORE WHICH IS ABOVE SAID SUBSURFACE FORMATION WHILE PROVIDING CONTROLLABLE COMMUNICATION THROUGH TUBING BETWEEN SAID FLUID CONTAINING FORMATION AND A WELLHEAD AT THE SURFACE OF SAID WELL BORE, THEREAFTER CREATING SUBSTANTIALLY INSTANTANEOUSLY AT LEAST ONCE A LOW PRESSURE VOID OR ZONE OF RAREFACTION IN THAT PORTION OF THE WELL BORE WHICH IS IN COMMUNICATION WITH SAID FLUID CONTAINING SUBSURFACE FORMATION BUT BENEATH SAID CONTROLLED COMMUNICATION IN SAID TUBING, AND CREATING A NEGATIVE FLUID PULSE OR SURGE OF FLUID FROM SAID SUBSURFACE FORMATION INTO SAID CREATED LOW PRESSURE VOID OR ZONE OF RAREFACTION IN SAID PACKED OFF PORTION OF SAID WELL BORE THAT IS IN COMMUNICATION WITH SAID FLUID CONTAINING FORMATION.
Claim 2
Independent Claim
149 words
A METHOD OF WELL COMPLETION OR WORKOVER OF OIL, GAS OR OTHER FLUID CONTAINING SUBSURFACE FORMATIONS INTO WHICH A WELL BORE HAS BEEN DRILLED, WHICH COMPRISES THE STEP OF PACKING OFF SAID FLUID CONTAINING SUBSURFACE FORMATION FROM SAID WELL BORE WHICH IS ABOVE SAID SUBSURFACE FORMATION WHILE PROVIDING CONTROLLABLE COMMUNICATION THROUGH TUBING BETWEEN SAID FLUID CONTAINING FORMATION AND A WELLHEAD AT THE SURFACE OF SAID WELL BORE, THEREAFTER CREATING SUBSTANTIALLY INSTANTANEOUSLY AT LEAST ONCE A LOW PRESSURE VOID OR ZONE OF RAREFACTION IN THAT PORTION OF THE WELL BORE WHICH IS IN COMMUNICATION WITH SAID FLUID CONTAINING SUBSURFACE FORMATION BUT BENEATH SAID CONTROLLED COMMUNICATION IN SAID TUBING, AND CREATING A NEGATIVE FLUID PULSE OR SURGE OF FLUID FROM SAID SUBSURFACE FORMATION INTO SAID CREATED LOW PRESSURE VOID OR ZONE OF RAREFACTION IN SAID PACKED OFF PORTION OF SAID WELL BORE THAT IS IN COMMUNICATION WITH SAID FLUID CONTAINING FORMATION.
Claim 3
Dependent Claim
64 words
The method of claim 1 wherein said well bore has a casing or liner which is cemented through said fluid containing subsurface formation, comprising the additional step of packing off said cemented casing or liner above said fluid containing formation, providing communication between said lower packed off portion of said well bore and said fluid containing formation by perforating through said casing or liner.
Claim 4
Dependent Claim
31 words
The method of claim 2 including testing the production of fluid from said subsurface formation through said tubing having controlled communication with said wellhead at the top of said well bore.
Claim 5
Dependent Claim
29 words
The method of claim 3 inlcuding testing the production of fluid from said subsurface formation, and cementing or plugging through said tubing from said wellhead perforations producing undesired fluids.
Claim 6
Dependent Claim
53 words
The method of claim 1 including following said negative pulse or surge of fluid from said subsurface formation into said packed off portion of said well bore by an injection of fluid into said fluid containing formation through said tubing having controlled communication with said wellhead at the top of said well bore.
Claim 7
Dependent Claim
16 words
The method of claiM 5 wherein said injected fluid is inclusive of gases, solvents or emulsions.
Claim 8
Dependent Claim
14 words
The method of claim 5 wherein said injected fluid is a gas or solvent.
Claim 9
Dependent Claim
31 words
The method of claim 5 including thereafter testing production of fluid from said subsurface formation through said tubing having controlled communication with said wellhead at the top of said well bore.
Claim 10
Dependent Claim
75 words
The method of claim 1 wherein said fluid containing formation is fractured by establishing formation fluid pressures up to or near the formation breakdown pressure in said packed off lower portion of said well bore which is in communication with said fluid containing formation prior to said creating of said negative pulse or low pressure void by the injecting of fluids at said wellhead through said tubing having controlled communication with said fluid containing formation.
Claim 11
Dependent Claim
15 words
The method of claim 9 wherein said established formation fluid pressures have included therein gases.
Claim 12
Dependent Claim
18 words
The method of claim 9 wherein said formation fluid pressures are created by pressurized gases, solvents or emulsions.
Claim 13
Dependent Claim
45 words
The method of claim 9 including the further step of injecting additional fracturing fluids into said formation following said negative pulse or surge of fluid from said subsurface formation into said lower packed off portion of said well bore through said tubing from said wellhead.
Claim 14
Dependent Claim
17 words
The method of claim 12 wherein said additionally injected fluid is inclusive of gases, solvents or emulsions.
Claim 15
Dependent Claim
15 words
The method of claim 12 wherein said additionally injected fluid is a gas or solvent.
Claim 16
Dependent Claim
32 words
The method of claim 12 including thereafter testing production of fluid from said subsurface formation through said tubing having said controlled communication with said wellhead at the top of said well bore.
Claim 17
Independent Claim
163 words
A method of well completion or workover of oil, gas or other fluid containing subsurface formations into which a well bore has been drilled, which comprises the step of packing off said fluid containing subsurface formation from said well bore which is above said subsurface formation, thereafter creating substantially instantaneously a low pressure void or zone of rarefaction in that portion of the well bore which is in communication with said fluid containing subsurface formation, and creating a negative fluid pulse or surge of fluid from said substrate formation into said created low pressure void or zone of rarefaction in said packed off portion of said well bore that is in communication with said fluid containing formation, including following said negative pulse or surge of fluid from said subsurface formation into said packed off portion of said well bore by an injection of fluid into said fluid containing subsurface formation, wherein said injected fluid is inclusive of an acidizing agent or corrosion inhibitor.
Claim 18
Independent Claim
163 words
A method of well completion or workover of oil, gas or other fluid containing subsurface formations into which a well bore has been drilled, which comprises the step of packing off said fluid containing subsurface formation from said well bore which is above said subsurface formation, thereafter creating substantially instantaneously a low pressure void or zone of rarefaction in that portion of the well bore which is in communication with said fluid containing subsurface formation, and creating a negative fluid pulse or surge of fluid from said substrate formation into said created low pressure void or zone of rarefaction in said packed off portion of said well bore that is in communication with said fluid containing formation, including following said negative pulse or surge of fluid from said subsurface formation into said packed off portion of said well bore by an injection of fluid into said fluid containing subsurface formation, wherein said injected fluid is inclusive of an acidizing agent or corrosion inhibitor.
Claim 19
Independent Claim
160 words
A method of well completion or workover of oil, gas or other fluid containing subsurface formations into which a well bore has been drilled, which comprises the step of packing off said fluid containing subsurface formation from said well bore which is above said subsurface formation, thereafter creating substantially instantaneously a low pressure void or zone of rarefaction in that portion of the well bore which is in communication with said fluid containing subsurface formation, and creating a negative fluid pulse or surge of fluid from said substrate formation into said created low pressure void or zone of rarefaction in said packed off portion of said well bore that is in communication with said fluid containing formation, including following said negative pulse or surge of fluid from said subsurface formation into said packed off portion of said well bore by an injection of fluid into said fluid containing subsurface formation, wherein said injected fluid is heated prior to its injection.
Claim 20
Independent Claim
160 words
A method of well completion or workover of oil, gas or other fluid containing subsurface formations into which a well bore has been drilled, which comprises the step of packing off said fluid containing subsurface formation from said well bore which is above said subsurface formation, thereafter creating substantially instantaneously a low pressure void or zone of rarefaction in that portion of the well bore which is in communication with said fluid containing subsurface formation, and creating a negative fluid pulse or surge of fluid from said substrate formation into said created low pressure void or zone of rarefaction in said packed off portion of said well bore that is in communication with said fluid containing formation, including following said negative pulse or surge of fluid from said subsurface formation into said packed off portion of said well bore by an injection of fluid into said fluid containing subsurface formation, wherein said injected fluid is heated prior to its injection.
Claim 21
Independent Claim
161 words
A method of well completion or workover of oil, gas or other fluid containing subsurface formations into which a well bore has been driLled, which comprises the step of packing off said fluid containing subsurface formation from said well bore which is above said subsurface formation, thereafter creating substantially instantaneously a low pressure void or zone of rarefaction in that portion of the well bore which is in communication with said fluid containing subsurface formation, and creating a negative fluid pulse or surge of fluid from said subsurface formation into said created low pressure void or zone of rarefaction in said packed off portion of said well bore that is in communication with said fluid containing formation, including following said negative pulse or surge of fluid from said subsurface formation into said packed off portion of said well bore by an injection of fluid into said fluid containing subsurface formation, wherein said injected fluid is a formation cementing or plugging agent.
Claim 22
Independent Claim
161 words
A method of well completion or workover of oil, gas or other fluid containing subsurface formations into which a well bore has been driLled, which comprises the step of packing off said fluid containing subsurface formation from said well bore which is above said subsurface formation, thereafter creating substantially instantaneously a low pressure void or zone of rarefaction in that portion of the well bore which is in communication with said fluid containing subsurface formation, and creating a negative fluid pulse or surge of fluid from said subsurface formation into said created low pressure void or zone of rarefaction in said packed off portion of said well bore that is in communication with said fluid containing formation, including following said negative pulse or surge of fluid from said subsurface formation into said packed off portion of said well bore by an injection of fluid into said fluid containing subsurface formation, wherein said injected fluid is a formation cementing or plugging agent.
Claim 23
Independent Claim
213 words
A method of well completion or workover of oil, gas or other fluid containing subsurface formation into which is well bore has been drilled, which comprises the step of packing off said fluid containing subsurface formation from said well bore which is above said subsurface formation, thereafter creating substantially instantaneously a low pressure void or zone of rarefaction in that portion of the well bore which is in communication with said fluid containing subsurface formation, and creating a negative fluid pulse or surge of fluid from said subsurface formation into said created low pressure void or zone of rarefaction in said packed off portion of said well bore that is in communication with said fluid containing formation, wherein said fluid containing formation is fractured by establishing formation fluid pressure up to or near the formation breakdown pressure in said packed off lower portion of said well bore which is in communication with said fluid containing formation prior to said creating of said negative pulse or low pressure void, including the further step of injecting additional fracturing fluids into said formation following said negative pulse or surge of fluid from said subsurface formation into said lower packed off portion of said well bore, wherein said additional fracturing fluids are inclusive of an acidizing agent.
Claim 24
Independent Claim
213 words
A method of well completion or workover of oil, gas or other fluid containing subsurface formation into which is well bore has been drilled, which comprises the step of packing off said fluid containing subsurface formation from said well bore which is above said subsurface formation, thereafter creating substantially instantaneously a low pressure void or zone of rarefaction in that portion of the well bore which is in communication with said fluid containing subsurface formation, and creating a negative fluid pulse or surge of fluid from said subsurface formation into said created low pressure void or zone of rarefaction in said packed off portion of said well bore that is in communication with said fluid containing formation, wherein said fluid containing formation is fractured by establishing formation fluid pressure up to or near the formation breakdown pressure in said packed off lower portion of said well bore which is in communication with said fluid containing formation prior to said creating of said negative pulse or low pressure void, including the further step of injecting additional fracturing fluids into said formation following said negative pulse or surge of fluid from said subsurface formation into said lower packed off portion of said well bore, wherein said additional fracturing fluids are inclusive of an acidizing agent.
Claim 25
Independent Claim
229 words
A method of well completion or workover of oil, gas or other fluid containing subsurface formations into which a well bore has been drilled, which comprises the step of packing off said fluid containing subsurface formation from said well bore which is above said subsurface formation, thereafter creating substantially instantaneously a low pressure void or zone of rarefaction in that portion of the well bore which is in communication with said fluid containing subsurface formation, and creating a negative fluid pulse or surge of fluid from said subsurface formation into said created low pressure void or zone of rarefaction in said packed off portion of said well bore that is in communication with said fluid containing formation, wherein said fluid containing formation is fractured by establishing formation fluid pressure up to or near the formation breakdown pressure in said packed off lower portion of said well bore which is in communication with said fluid containing formation prior to said creating of said negative pulse or low pressure void, including the further step of injecting additional fracturing fluids into said formation following said negative pulse or surge of fluid from said subsurface formation into said lower packed off portion of said well bore, and thereafter testing production of fluid from said subsurface formation, and following said testing by cementing or plugging off undesired fluid production from said fluid containing formation.
Claim 26
Independent Claim
229 words
A method of well completion or workover of oil, gas or other fluid containing subsurface formations into which a well bore has been drilled, which comprises the step of packing off said fluid containing subsurface formation from said well bore which is above said subsurface formation, thereafter creating substantially instantaneously a low pressure void or zone of rarefaction in that portion of the well bore which is in communication with said fluid containing subsurface formation, and creating a negative fluid pulse or surge of fluid from said subsurface formation into said created low pressure void or zone of rarefaction in said packed off portion of said well bore that is in communication with said fluid containing formation, wherein said fluid containing formation is fractured by establishing formation fluid pressure up to or near the formation breakdown pressure in said packed off lower portion of said well bore which is in communication with said fluid containing formation prior to said creating of said negative pulse or low pressure void, including the further step of injecting additional fracturing fluids into said formation following said negative pulse or surge of fluid from said subsurface formation into said lower packed off portion of said well bore, and thereafter testing production of fluid from said subsurface formation, and following said testing by cementing or plugging off undesired fluid production from said fluid containing formation.
Claim 27
Independent Claim
176 words
A method of well completion or workover of oil, gas or other fluid containing subsurface formations into which a well bore has been drilled, which comprises the step of packing off said fluid contaIning subsurface formation from said well bore which is above said subsurface formation, thereafter creating substantially instantaneously a low pressure void or zone of rarefaction in that portion of the well bore which is in communication with said fluid containing subsurface formation, and creating a negative fluid pulse or surge of fluid from said subsurface formation into said created low pressure void or zone of rarefaction in said packed off portion of said well bore that is in communication with said fluid containing formation, including following said negative pulse or surge of fluid from said subsurface formation into said packed off portion of said well bore by an injection of fluid into said fluid containing subsurface formation, thereafter testing production of fluid from said subsurface formation, and following said testing by cementing or plugging off undesired fluid production from said fluid containing formation.
Claim 28
Independent Claim
176 words
A method of well completion or workover of oil, gas or other fluid containing subsurface formations into which a well bore has been drilled, which comprises the step of packing off said fluid contaIning subsurface formation from said well bore which is above said subsurface formation, thereafter creating substantially instantaneously a low pressure void or zone of rarefaction in that portion of the well bore which is in communication with said fluid containing subsurface formation, and creating a negative fluid pulse or surge of fluid from said subsurface formation into said created low pressure void or zone of rarefaction in said packed off portion of said well bore that is in communication with said fluid containing formation, including following said negative pulse or surge of fluid from said subsurface formation into said packed off portion of said well bore by an injection of fluid into said fluid containing subsurface formation, thereafter testing production of fluid from said subsurface formation, and following said testing by cementing or plugging off undesired fluid production from said fluid containing formation.
Claim 29
Independent Claim
178 words
A method of well completion or workover of oil, gas or other fluid containing subsurface formations into which a well bore has been drilled, which comprises the step of packing off said fluid containing subsurface formation from said well bore which is above said subsurface formation, thereafter creating substantially instantaneously a low pressure void or zone of rarefaction in that portion of the well bore which is in communication with said fluid containing subsurface formation, and creating a negative fluid pulse or surge of fluid from said subsurface formation into said created low pressure void or zone of rarefaction in said packed off portion of said well bore that is in communication with said fluid containing formation, wherein said low pressure void or zone of rarefaction is occasioned by a sonic wave generator, pump or compressor operated by a separate power source which imposes sonic waves or an increase of fluid pressure upon fluid contained in said well bore above said packed off lower portion of said well bore which is in communication with said fluid containing formation.
Claim 30
Independent Claim
178 words
A method of well completion or workover of oil, gas or other fluid containing subsurface formations into which a well bore has been drilled, which comprises the step of packing off said fluid containing subsurface formation from said well bore which is above said subsurface formation, thereafter creating substantially instantaneously a low pressure void or zone of rarefaction in that portion of the well bore which is in communication with said fluid containing subsurface formation, and creating a negative fluid pulse or surge of fluid from said subsurface formation into said created low pressure void or zone of rarefaction in said packed off portion of said well bore that is in communication with said fluid containing formation, wherein said low pressure void or zone of rarefaction is occasioned by a sonic wave generator, pump or compressor operated by a separate power source which imposes sonic waves or an increase of fluid pressure upon fluid contained in said well bore above said packed off lower portion of said well bore which is in communication with said fluid containing formation.
Claim 31
Dependent Claim
56 words
The method of claim 22 wherein fluid contained in said well bore above said packed off portion thereof includes an acidizing agent and said operation by said separate power source allows the injection of said agent into said fluid containing formation following said creating of said negative pulse or surge of fluid from said subsurface formation.
Claim 32
Dependent Claim
59 words
The method of claim 22 wherein fluid contained in said well bore above said packed off portion thereof includes or consists of gases or solvents and said operation by said separate power source allows the injection of said fluid into said fluid containing formation following said creation of said negative pulse or surge of fluid from said subsurface formation.
Claim 33
Dependent Claim
57 words
The method of claim 22 wherein fluid contained in said well bore above said packed off portion thereof is a formation pressuring fluid and said operation by said separate power source allows the injection of said formation pressuring fluid into said subsurface formation following said creation of said negative pulse or surge of fluid from said formation.
Claim 34
Dependent Claim
15 words
The method of claim 22 including thereafter testing production of fluid from said subsurface formation.
Claim 35
Dependent Claim
32 words
The method of claim 22 including thereafter testing production of fluid from said subsurface formation, and following said testing by cementing or plugging off undesired fluid production from said fluid containing formation.
Claim 36
Dependent Claim
56 words
The method of claim 22 wherein said fluid containing formation is fractured by establishing formation fluid pressures up to or near the formation breakdown pressure in said packed off lower portion of said well bore which is in communication with said fluid containing formation prior to said creating of said negative pulse or low pressure void.
Claim 37
Dependent Claim
39 words
The method of claim 28 including the further step of injecting additional fracturing fluids into said formation following said negative pulse or surge of fluid fRom said subsurface formation into said lower packed off portion of said well bore.
Claim 38
Dependent Claim
15 words
The method of claim 29 including thereafter testing production of fluid from said subsurface formation.
Claim 39
Dependent Claim
32 words
The method of claim 29 including thereafter testing production of fluid from said subsurface formation, and following said testing by cementing or plugging off undesired fluid production from said fluid containing formation.
Claim 40
Independent Claim
175 words
A method of well completion or workover of oil, gas or other fluid containing subsurface formations into which a well bore has been drilled, which comprises the step of packing off said fluid containing subsurface formation from said well bore which is above said subsurface formation, thereafter creating substantially instantaneously a low pressure void or zone of rarefaction in that portion of the well bore which is in communication with said fluid containing subsurface formation, and creating a negative fluid pulse or surge of fluid from said subsurface formation into said created low pressure void or zone of rarefaction in said packed off portion of said well bore that is in communication with said fluid containing formation, wherein said creation of said low pressure void or zone of rarefaction becomes a source of seismic energy within said subsurface formation, and wherein said source of seismic energy following its creation is recorded at adjacent well bores to indicate the type of fluid or formation existing between said source of seismic energy and said adjacent well bores.
Claim 41
Independent Claim
175 words
A method of well completion or workover of oil, gas or other fluid containing subsurface formations into which a well bore has been drilled, which comprises the step of packing off said fluid containing subsurface formation from said well bore which is above said subsurface formation, thereafter creating substantially instantaneously a low pressure void or zone of rarefaction in that portion of the well bore which is in communication with said fluid containing subsurface formation, and creating a negative fluid pulse or surge of fluid from said subsurface formation into said created low pressure void or zone of rarefaction in said packed off portion of said well bore that is in communication with said fluid containing formation, wherein said creation of said low pressure void or zone of rarefaction becomes a source of seismic energy within said subsurface formation, and wherein said source of seismic energy following its creation is recorded at adjacent well bores to indicate the type of fluid or formation existing between said source of seismic energy and said adjacent well bores.
Claim 42
Dependent Claim
66 words
The method of claim 32 wherein said low pressure void or zone of rarefaction is occasioned by a sonic wave generator, pump or compressor operated by a separate power source which imposes sonic waves or an increase of fluid pressure upon fluid contained in said well bore above said packed off lower portion of said well bore which is in communication with said fluid containing formation.
Claim 43
Dependent Claim
49 words
The method of claim 32 wherein said low pressure void or zone of rarefaction comprises a substantially instantaneous rarefaction or cavitational modulation imposed on a sonic wave in said fluid in said lower packed off portion of said well bore which is in communication with said fluid containing formation.
Claim 44
Dependent Claim
35 words
The method of claim 34 including varying the phase angle of said rarefaction or cavitational modulation in relation to said sonic wave, producing recognizable variations in said seismic energy recorded at said adjacent well bores.
Claim 45
Independent Claim
176 words
A method of well completion or workover of oil, gas or other fluid containing subsurface formations into which a well bore has been drilled, which comprises the step of packing off said fluid containing subsurface formation from said well bore which is above said subsurface formation, thereafter creating substantially instantaneously a low pressure void or zone of rarefaction in that portion of the well bore which is in communication with said fluid containing subsurface formation, and creating a negative fluid pulse or surge of fluid from said subsurface formation into said created low pressure void or zone of rarefaction in said packed off portion of said well bore that is in communication with said fluid containing formation, wherein said creation of said low pressure void or zone of rarefaction becomes a source of seismic energy within said subsurface formation, and wherein said source of seismic energy following its creation is recorded at the surface surrounding said well bore or at said well bore to indicate the type of fluid or formation existing in the subsurface formation.
Claim 46
Independent Claim
176 words
A method of well completion or workover of oil, gas or other fluid containing subsurface formations into which a well bore has been drilled, which comprises the step of packing off said fluid containing subsurface formation from said well bore which is above said subsurface formation, thereafter creating substantially instantaneously a low pressure void or zone of rarefaction in that portion of the well bore which is in communication with said fluid containing subsurface formation, and creating a negative fluid pulse or surge of fluid from said subsurface formation into said created low pressure void or zone of rarefaction in said packed off portion of said well bore that is in communication with said fluid containing formation, wherein said creation of said low pressure void or zone of rarefaction becomes a source of seismic energy within said subsurface formation, and wherein said source of seismic energy following its creation is recorded at the surface surrounding said well bore or at said well bore to indicate the type of fluid or formation existing in the subsurface formation.
Claim 47
Dependent Claim
66 words
The method of claim 36, wherein said low pressure void or zone of rarefaction is occasioned by a sonic wave generator, pump or compressor operated by a separate power source which imposes sonic waves or an increase of fluid pressure upon fluid contained in said well bore above said packed off lower portion of said well bore which is in communication with said fluid containing formation.
Claim 48
Dependent Claim
49 words
The method of claim 36 wherein said low pressure void or zone of rarefaction comprises a substantially instanaeous rarefraction or cavitational modulation imposed on a sonic wave in said fluid in said lower packed off portion of said well bore which is in communication with said fluid containing formation.
Claim 49
Dependent Claim
38 words
The method of claim 38 including varying the phase angle of said rarefaction or cavitational modulation in relation to said sonic wave, producing recognizable variations in said seismic energy recorded at said surface or at said well bore.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-01 | 1979-06-02 | 1979-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-01 | 1983-06-02 | 1983-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-01 | 1987-06-02 | 1987-12-02 | $7700.00 | Window Closed / Lapsed |