Patent US3658138A successfully refreshed from Google Patents.
US3658138A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for optimizing the penetration speed of a drilling tool driven by a motor whose torque decreases with an increasing running speed and apparatus therefor
Assignee: IFP Energies nouvelles
•
Filing: 1970-04-21
•
Granted: 1972-04-25
•
Expires: 1990-04-21
Abstract
Abstract A process for optimizing the penetration speed of a drilling tool driven by a motor whose torque decreases with an increasing running speed and vice-versa, comprising the steps of alternately increasing and decreasing the load on the tool about its optimum value by acting on the tensile stress exerted on the drill string, thereby defining periods of increase and periods of decrease of the ratio -( Delta Va/T) which is, with a changed sign the ratio between the variation of the penetration speed of the tool and the corresponding variation of the tensile stress exerted on the drill string, of controlling the passage from a tensile stress-increasing period, at the latest when the ratio ( Delta Va/T) attains, while decreasing, a lower limit value and of controlling the passage from a tensile stress-decreasing period to a tensile stress-increasing period at the latest when said ratio attains, while increasing, an upper limit-value, said lower and upper limit values being preselected and adjustable.
Inventors
- 👤 Jean Charles Gosselin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:21
CPC Classifications
E; E21; E21B; E21B45/00; E21B19/00; E21B19/08; E21B19/084; E21B19/22
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
155 words
A process for optimizing the penetration speed of a drilling tool driven by a motor whose torque decreases with an increasing running speed and vice-versa, comprising the steps of alternately increasing and decreasing the load on the tool about its optimum value by acting on the tensile stress exerted on the drill string, thereby defining periods of increase and periods of decrease of the ratio - ( Delta Va/ Delta T) which is, with a changed sign the ratio between the variation of the tensile stress exerted on the drill string, of controlling the passage from a tensile stress-increasing period, at the latest when the ratio - ( Delta Va/ Delta T) attains, while decreasing, a lower limit-value and of controlling the passage from a tensile stressdecreasing period to a tensile stress-increasing period at the latest when said ratio attains, while increasing, an upper limitvalue, said lower and upper limit values being preselected and adjustable.
Claim 2
Dependent Claim
155 words
A process for optimizing the penetration speed of a drilling tool driven by a motor whose torque decreases with an increasing running speed and vice-versa, comprising the steps of alternately increasing and decreasing the load on the tool about its optimum value by acting on the tensile stress exerted on the drill string, thereby defining periods of increase and periods of decrease of the ratio - ( Delta Va/ Delta T) which is, with a changed sign the ratio between the variation of the tensile stress exerted on the drill string, of controlling the passage from a tensile stress-increasing period, at the latest when the ratio - ( Delta Va/ Delta T) attains, while decreasing, a lower limit-value and of controlling the passage from a tensile stressdecreasing period to a tensile stress-increasing period at the latest when said ratio attains, while increasing, an upper limitvalue, said lower and upper limit values being preselected and adjustable.
Claim 3
Dependent Claim
43 words
A process according to claim 1 wherein said ratio - ( Delta Va/ Delta T) is determined from average values of the penetration speed Va and tensile stress T over time intervals equal to the pulsing period of the drilling fluid circulation pumps.
Claim 4
Dependent Claim
183 words
Automatic apparatus for optimizing the penetration rate of a drilling tool driven by a motor whose torque decreases with an increasing running speed and vice-versa, comprising in combination means for progressively varying the weight on the tool, means for reversing the direction of said weight variation, means for measuring the algebraic value of the ratio - ( Delta Va/ Delta T) which is, with a changed sign, the ratio between the variation of the penetration speed of the tool and the corresponding variation of the tensile stress exerted on the drill string, means for setting up an upper limit-value and a lower limit-value of said ratio, and means for comparing the value of said ratio with said limit-values, said means for comparing being connected to said means for measuring said ratio and to said means for reversing the direction of variation of the weight on the tool and being adapted to initiate a decrease in this weight at the latest when the value of said ratio attains said lower limit-value and an increase of this weight when said ratio attains said upper limit-value.
Claim 5
Dependent Claim
183 words
Automatic apparatus for optimizing the penetration rate of a drilling tool driven by a motor whose torque decreases with an increasing running speed and vice-versa, comprising in combination means for progressively varying the weight on the tool, means for reversing the direction of said weight variation, means for measuring the algebraic value of the ratio - ( Delta Va/ Delta T) which is, with a changed sign, the ratio between the variation of the penetration speed of the tool and the corresponding variation of the tensile stress exerted on the drill string, means for setting up an upper limit-value and a lower limit-value of said ratio, and means for comparing the value of said ratio with said limit-values, said means for comparing being connected to said means for measuring said ratio and to said means for reversing the direction of variation of the weight on the tool and being adapted to initiate a decrease in this weight at the latest when the value of said ratio attains said lower limit-value and an increase of this weight when said ratio attains said upper limit-value.
Claim 6
Dependent Claim
59 words
Apparatus according to claim 3 further comprising means for comparing the value of at least one other drilling parameter with a preset safety limit, said means being also connected to said means for reversing the direction of variation of the weight on the tool, so as to actuate the latter when the value of said parameter attains said limit.
Claim 7
Dependent Claim
108 words
A process for controlling the penetration speed of a drilling tool driven by a motor, the torque of which varies in inverse proportion to the running speed, comprising the steps of : measuring the penetration speed of the drilling tool ; detecting a change in said penetration speed; measuring the tensile stress exerted on the drilling tool; detecting the change in said tensile stress; determining the ratio of a change in said penetrating speed for a change in said tensile stress negative with respect thereto; and maintaining said ratio within prescribed maximum and minimum limits by controlling the load on the drilling tool in response to said ratio.
Claim 8
Dependent Claim
108 words
A process for controlling the penetration speed of a drilling tool driven by a motor, the torque of which varies in inverse proportion to the running speed, comprising the steps of : measuring the penetration speed of the drilling tool ; detecting a change in said penetration speed; measuring the tensile stress exerted on the drilling tool; detecting the change in said tensile stress; determining the ratio of a change in said penetrating speed for a change in said tensile stress negative with respect thereto; and maintaining said ratio within prescribed maximum and minimum limits by controlling the load on the drilling tool in response to said ratio.
Claim 9
Dependent Claim
40 words
A method according to claim 5, wherein said ratio is determined from the average values of the penetrating speed and tensile stress over time intervals equal to the pulsing period of the fluid circulation pumps for the drilling fluid .
Claim 10
Dependent Claim
53 words
A method according to claim 5, wherein said step of controlling the load on the drill tool comprises the steps of alternately increasing the load on the tool until said ratio reaches said prescRibed minimum limit and then decreasing the load exerted on the tool until said ratio reaches said prescribed maximum limit.
Claim 11
Dependent Claim
39 words
A method according to claim 7, wherein said step of increasing the load on the tool includes the step of driving the drill string downwardly with a feed break greater than the maximum penetrating speed of the drilling tool.
Claim 12
Dependent Claim
37 words
A method according to claim 7, wherein said step of decreasing the load exerted on the tool comprises the step of terminating the displacement of the drill string to thereby release the load on the drill tool.
Claim 13
Dependent Claim
31 words
A method according to claim 7, wherein said step of controlling the load on said drill tool further includes comparing said ratio with each of said prescribed maximum and minimum limits.
Claim 14
Dependent Claim
38 words
A method according to claim 10, wherein said step of driving said drill string comprises the step of driving said drill string at a linear speed substantially equal to about twice the penetration speed of the drill tool.
Claim 15
Independent Claim
145 words
An apparatus for controlling the penetration rate of a drilling tool by a motor , the torque of which varies inversely with respect to the running speed, comprising: first means for controlling the penetration speed of the drill tool; second means, responsive to said first means, for detecting a change in said penetrating speed; third means for measuring the tensile stress exerted on the drill string; fourth means, responsive to said third means for detecting a change in said tensile stress ; fifth means, responsive to said second and fourth means, for determining the rate of a change in said penetrating speed for a change in said tensile stress negative with respect thereto; and sixth means, responsive to said fifth means, for maintaining said ratio within prescribed maximum and minimum limits by controlling the load on the drill tool in response to said ratio .
Claim 16
Independent Claim
145 words
An apparatus for controlling the penetration rate of a drilling tool by a motor , the torque of which varies inversely with respect to the running speed, comprising: first means for controlling the penetration speed of the drill tool; second means, responsive to said first means, for detecting a change in said penetrating speed; third means for measuring the tensile stress exerted on the drill string; fourth means, responsive to said third means for detecting a change in said tensile stress ; fifth means, responsive to said second and fourth means, for determining the rate of a change in said penetrating speed for a change in said tensile stress negative with respect thereto; and sixth means, responsive to said fifth means, for maintaining said ratio within prescribed maximum and minimum limits by controlling the load on the drill tool in response to said ratio .
Claim 17
Dependent Claim
47 words
An apparatus according to claim 12, wherein said sixth means comprises means for alternately increasing the load on the drill tool until said ratio reaches said predetermined minimum limit and means for decreasing the load exerted on the tool until said ratio reaches said predetermined maximum limit.
Claim 18
Dependent Claim
40 words
An apparatus according to claim 13, wherein said means for increasing the load exerted on the drill tool comprises means for driving the drill string downwardly with a feed rate greater than the maximum penetration speed of the drilling tool.
Claim 19
Dependent Claim
37 words
An apparatus according to claim 14, wherein said means for decreasing the load exerted on the drill tool comprises means for terminating the displacement of the drill string to thereby release the load on the drill tool.
Claim 20
Dependent Claim
25 words
An apparatus according to claim 12, wherein said sixth means includes means for comparing said ratio with each of said prescribed maximum and minimum limits.
Claim 21
Dependent Claim
33 words
An apparatus according to claim 16, wherein said driving means comprises means for driving said drill string at a linear speed substantially equal to about twice the penetration speed of said drill tool.
Claim 22
Dependent Claim
51 words
An apparatus according to claim 16, wherein said comparing means includes means for comparing the value of at least one other drilling parameter with a preset safety limit, being connected to said displacement terminating means, so as to actuate said terminating means when the value of said parameter attains said limit.
References Cited (Backward Citations)
US3039543A
Cited
US3550697A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-04-25 | 1975-10-25 | 1976-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-25 | 1979-10-25 | 1980-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-25 | 1983-10-25 | 1984-04-25 | $7700.00 | Window Closed / Lapsed |