US3842912A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for deep gas well completions
Assignee: Lindsey Completion Systems Inc
•
Filing: 1973-09-04
•
Granted: 1974-10-22
•
Expires: 1993-09-04
Abstract
Abstract A tubular assembly having spaced-apart receptacles with polished bores is disposable in a well bore cementing dementing in place with the receptacle bores disposed above and below a producing formation. Upper and lower seal assemblies which are slidably and sealingly receivable in the spaced-apart receptacle bores are carried by a ''''long'''' tubing string and close off the receptacle bores to form an enclosed volume and provide a fluid conduit for fluids below the lower seal assembly. The upper seal assembly has an opening therethrough to the enclosed volume and is connectable to a ''''short'''' string of tubing. The effective cross-sectional area across the lower seal assembly is made equal to the effective cross-sectional area across the upper seal assembly by adjustment of the area of the opening through the upper seal assembly. The balancing of the effective cross-sectional areas eliminates movement of the seal assemblies during treating operations and eliminates the need for equipment to anchor the seal assemblies during treating operations.
Inventors
- 👤 H Lindsey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:20
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/10; E21B33/12; E21B33/124; E21B43/00; E21B43/14; E21B43/25
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
132 words
A method for treating at least two spaced-apart strata in a well bore traversing earth formations where said strata are opened to the interior of a tubular assembly and the assembly has upper and lower packer bores disposed to straddle the upper strata, closing off said upper and lower packer bores with substantially equal, effective cross-sectional upper and lower areas while providing with a first string of tubing a flow conduit through said packer bores where the flow conduit extends from the earth''s surface to the lower strata, connecting a second tubing string through the closed upper packer bore to the volume defined between the upper and lower areas, and applying weight on the first string of tubing while introducing a fluid to the upper strata through the second string of tubing.
Claim 2
Independent Claim
132 words
A method for treating at least two spaced-apart strata in a well bore traversing earth formations where said strata are opened to the interior of a tubular assembly and the assembly has upper and lower packer bores disposed to straddle the upper strata, closing off said upper and lower packer bores with substantially equal, effective cross-sectional upper and lower areas while providing with a first string of tubing a flow conduit through said packer bores where the flow conduit extends from the earth''s surface to the lower strata, connecting a second tubing string through the closed upper packer bore to the volume defined between the upper and lower areas, and applying weight on the first string of tubing while introducing a fluid to the upper strata through the second string of tubing.
Claim 3
Independent Claim
189 words
A method for treating at least two spaced-apart strata in a well bore traversing earth formations where said strata are opened to the interior of a tubular assembly and the assembly has upper and lower packer bores disposed to straddle the upper strata, closing off said upper and lower packer bores with substantially equal, effective cross-sectional upper and lower areas while providing with a first string of tubing, a flow conduit through said packer bores where the flow conduit extends from the earth''s surface to the lower strata, applying weight on the first string of tubing to accommodate changes in tubing length due to temperature, lowering a second tubing string to the upper packer bore and introducing an inhibiting fluid to volume defined between the upper and lower areas, connecting said second tubing string through the closed upper packer bore to the volume defined between the upper and lower areas, introducing acid through said first string of tubing to said lower strata, flushing said acid from said lower strata, introducing acid through said second string of tubing to said upper strata, and flushing said acid from said upper strata.
Claim 4
Independent Claim
189 words
A method for treating at least two spaced-apart strata in a well bore traversing earth formations where said strata are opened to the interior of a tubular assembly and the assembly has upper and lower packer bores disposed to straddle the upper strata, closing off said upper and lower packer bores with substantially equal, effective cross-sectional upper and lower areas while providing with a first string of tubing, a flow conduit through said packer bores where the flow conduit extends from the earth''s surface to the lower strata, applying weight on the first string of tubing to accommodate changes in tubing length due to temperature, lowering a second tubing string to the upper packer bore and introducing an inhibiting fluid to volume defined between the upper and lower areas, connecting said second tubing string through the closed upper packer bore to the volume defined between the upper and lower areas, introducing acid through said first string of tubing to said lower strata, flushing said acid from said lower strata, introducing acid through said second string of tubing to said upper strata, and flushing said acid from said upper strata.
Claim 5
Independent Claim
204 words
A method for completing a well traversing earth formations comprising the steps of: locating a tubular packer bore receptacle assembly having upper and lower packer bores in a borehole so that such packer bores straddle an earth strata for production of hydrocarbons, cementing said receptacle assembly in such a location and placing said earth strata into fluid communication with the bore of such packer bore receptacle assembly intermediate of such upper and lower packer bores, closing off the lower and upper packer bores with packing means associated with a string of tubing to form an enclosed volume between said lower and upper packer bores where said enclosed volume is defined by the bore of packer bore receptacle assembly and the upper and lower cross-sectional areas exclusive of the cross-sectional area of such string of tubing, introducing a well treating fluid under pressure through said upper packing means to said enclosed volume where said upper and lower cross-sectional areas are adjusted to substantially balance the said upper and lower cross-sectional areas to effectively equal amounts thereby to equalize the upward and downward forces on the string of tubing within said enclosed volume and treating the earth strata intermediate of said upper and lower packer bores.
Claim 6
Independent Claim
204 words
A method for completing a well traversing earth formations comprising the steps of: locating a tubular packer bore receptacle assembly having upper and lower packer bores in a borehole so that such packer bores straddle an earth strata for production of hydrocarbons, cementing said receptacle assembly in such a location and placing said earth strata into fluid communication with the bore of such packer bore receptacle assembly intermediate of such upper and lower packer bores, closing off the lower and upper packer bores with packing means associated with a string of tubing to form an enclosed volume between said lower and upper packer bores where said enclosed volume is defined by the bore of packer bore receptacle assembly and the upper and lower cross-sectional areas exclusive of the cross-sectional area of such string of tubing, introducing a well treating fluid under pressure through said upper packing means to said enclosed volume where said upper and lower cross-sectional areas are adjusted to substantially balance the said upper and lower cross-sectional areas to effectively equal amounts thereby to equalize the upward and downward forces on the string of tubing within said enclosed volume and treating the earth strata intermediate of said upper and lower packer bores.
Claim 7
Dependent Claim
159 words
Apparatus for use in oil and gas wells which traverse earth formations comprising: a packer bore receptacle assembly adapted for cementing in place in a borehole, said receptacle assembly having upper and lower packer bores, packer sealing means including an upper packer sealing assembly and a lower packer sealing assembly, said sealing assemblies being constructed and arranged for a sliding and sealing reception respectively in said upper and lower packer bores, said sealing assemblies being coupled to one another and spaced-apart by a section of tubing so that when said upper packer sealing assembly and said lower packer sealing assembly are slidingly and sealingly received in said upper and lower packer bores that upper and lower cross-sectional areas are defined, means defining a flow conduit through said upper cross-sectional area, said flow conduit means being sized in cross-sectional area relative to said upper cross-sectional area whereby the effective areas of said upper and lower cross-sectional areas are substantially equal.
Claim 8
Dependent Claim
159 words
Apparatus for use in oil and gas wells which traverse earth formations comprising: a packer bore receptacle assembly adapted for cementing in place in a borehole, said receptacle assembly having upper and lower packer bores, packer sealing means including an upper packer sealing assembly and a lower packer sealing assembly, said sealing assemblies being constructed and arranged for a sliding and sealing reception respectively in said upper and lower packer bores, said sealing assemblies being coupled to one another and spaced-apart by a section of tubing so that when said upper packer sealing assembly and said lower packer sealing assembly are slidingly and sealingly received in said upper and lower packer bores that upper and lower cross-sectional areas are defined, means defining a flow conduit through said upper cross-sectional area, said flow conduit means being sized in cross-sectional area relative to said upper cross-sectional area whereby the effective areas of said upper and lower cross-sectional areas are substantially equal.
Claim 9
Dependent Claim
140 words
The apparatus of claim 4 wherein said upper packer bore has a first polished uniform diameter extending between a first, inwardly extending shoulder and a second, outwardly extending shoulder, where said second shoulder is disposed abOve said first shoulder, said lower packer bore has a second polished uniform diameter extending between a third, inwardly extending shoulder and a fourth, outwardly extending shoulder, where said fourth shoulder is disposed above said third shoulder, said upper and lower packer sealing assemblies respectively having first and second sealing elements thereon, fifth and sixth downwardly facing shoulders, respectively located below each of said sealing elements, said section of tubing spacing, said fifth and sixth shoulders from one another so that upon engagement of the fifth shoulder with the third, inwardly extending shoulder, that the sixth shoulder is located above the first, inwardly extending shoulder.
Claim 10
Dependent Claim
28 words
The apparatus of claim 5 wherein said first and second sealing elements are slightly compressible and slightly greater in diameter than the diameters of the respective packer bores.
Claim 11
Dependent Claim
44 words
The apparatus of claim 4 wherein said flow conduit means includes an upper polished bore with an inwardly extending shoulder and a tubular member constructed and arranged for sliding and sealing reception into said upper polished bore and engagement with said inwardly extending shoulder.
Claim 12
Dependent Claim
22 words
The apparatus of claim 4 wherein said packer bore receptacle assembly includes means for anchoring said assembly within another tubular well member.
Claim 13
Dependent Claim
69 words
The apparatus of claim 4 wherein the effective area of said upper cross-sectional area is defined by the diameter of said upper packer bore less the cross-sectional area for said flow conduit and the cross-sectional area for said section of tubing and the effective area of said lower cross-sectional area is defined by the diameter of said lower packer bore less the cross-sectional area for said section of tubing.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-21 | 1978-04-22 | 1978-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-21 | 1982-04-22 | 1982-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-21 | 1986-04-22 | 1986-10-22 | $7700.00 | Window Closed / Lapsed |