IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0984052
(2011-01-04)
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등록번호 |
US-8467268
(2013-06-18)
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발명자
/ 주소 |
|
출원인 / 주소 |
- Welltronics Applications, LLC
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대리인 / 주소 |
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인용정보 |
피인용 횟수 :
5 인용 특허 :
8 |
초록
▼
A pressure release encoding system for communicating downhole information through a wellbore to a surface location include a downhole tool with a valve for providing a fluid restriction to fluid passing in the wellbore, a sensor positioned in the wellbore for sensing a downhole condition in the well
A pressure release encoding system for communicating downhole information through a wellbore to a surface location include a downhole tool with a valve for providing a fluid restriction to fluid passing in the wellbore, a sensor positioned in the wellbore for sensing a downhole condition in the wellbore, a brake cooperative with the valve for moving the valve between at least two positions in timed relation to the downhole condition sensed by the sensor, and a detector positioned at the surface location for providing a measurement value at the surface location correlative to the time between the changes of the pressure of the fluid in the wellbore. The system associates position of the valve with pressure transduction. The sensor is an inclination sensor for sensing an angle of inclination of the wellbore.
대표청구항
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1. A method of communicating within a wellbore, the wellbore having a drilling mud circulation system therein, the circulation system being through a drill string, a drilling sub affixed to said drill string, a drill bit and an interior of said wellbore, the method comprising: positioning a valve me
1. A method of communicating within a wellbore, the wellbore having a drilling mud circulation system therein, the circulation system being through a drill string, a drilling sub affixed to said drill string, a drill bit and an interior of said wellbore, the method comprising: positioning a valve means in a fluid passageway of said drilling sub;positioning a brake with a brake piston in said drilling sub, said brake piston being cooperative with said valve means;forming a flow restriction within the circulation system at said drilling sub, said flow restriction being said valve means;applying a quantified flow of drilling mud in the circulation system against said flow restriction so as to cause a pressure drop across said valve means;sensing a quantifiable downhole condition;receding said brake piston from a first receded fixed position to a second receded fixed position so as to cause said valve means to release a first percentage of said pressure;releasing said first percentage of pressure across said valve means within said flow restriction at a first time;releasing a second percentage of pressure across said valve means within said flow restriction at a second time, a time between said first time and said second time being correlative to the downhole condition; anddetermining downhole condition changes from a surface location by sensing the time between said first time and said second time. 2. The method of communicating within a wellbore, according to claim 1, said step of sensing comprising: sensing an angle of the drilling sub, said drilling sub being aligned with said wellbore, said downhole condition being the angle of inclination. 3. The method of communicating within a wellbore, according to claim 1, wherein the step of receding said brake piston comprises setting said first receded position at a first equilibrium state of said valve means, and wherein the step of releasing said second percentage of pressure comprises setting said second receded position at a second equilibrium state of said valve means. 4. The method of communicating within a wellbore, according to claim 1, wherein said first receded fixed position corresponds to a first equilibrium state of said valve means after starting the circulation system, said second receded fixed position corresponding to a second equilibrium state of said valve means after releasing a first percentage of pressure. 5. The method of communicating within a wellbore, according to claim 3, said step of determining comprising: measuring a time between release of said first percentage and release of said second percentage; andcorrelating said time to the downhole condition. 6. The method of communicating within a wellbore, according to claim 2, wherein the drilling string has a bit sub interconnected thereto, and wherein said quantifiable downhole condition is comprised of a sensed angle of inclination of said bit sub, the method further comprising: assigning a time value to a sensed angle of inclination of said bit sub; andmoving said brake between said first receded fixed position and said second receded fixed position at a time equal to said time value. 7. The method of communicating within a wellbore, according to claim 1, wherein said brake is a hydraulic brake, the hydraulic brake being comprised of a hydraulic chamber filled with oil, a sliding piston, a return spring, a control means for preventing displacement of oil when said sliding piston pushes against said oil, and a hydraulic oil pressure sensor means, and wherein the step of receding said brake piston correlates with detection of mud flow via a pressure measurement of said oil in said hydraulic chamber by a hydraulic oil pressure sensor means from force applied by said valve means when restricting said flow of drilling mud in a partially open position and when starting said flow of drilling mud through said wellbore. 8. The method of communicating within a wellbore, according to claim 7, wherein said detection of mud flow is comprised of a pressure measurement cooperative with differential pressure across said valve means by said hydraulic oil pressure sensor means. 9. The method of communicating within a wellbore, according to claim 1, further comprising the step of: increasing flow restriction to an original state when flow through the flow restriction has returned to zero. 10. A method of communicating within a wellbore, the wellbore having a drilling mud circulation system therein, the circulation system being through a drill string, a drilling sub affixed to said drill string, and an interior of said wellbore, the method comprising: positioning a valve means in a fluid passageway of said drilling sub;positioning a brake with a brake piston in said drilling sub, said brake piston being cooperative with said valve means;sensing a quantifiable downhole condition;forming a flow restriction within the circulation system at said drilling sub, said flow restriction being comprised of said valve means and said brake;applying a quantified pressure of drilling mud in the circulation system against said flow restriction;releasing a first percentage of pressure within said flow restriction at a first time;releasing a second percentage of pressure within said flow restriction at a second time, a time between said first time and said second time being correlative to the downhole condition; anddetermining the downhole condition at a surface location by sensing the time between said first time and said second time. 11. The method of claim 10, said step of sensing comprising: sensing an angle of inclination of a drill bit within the wellbore, said downhole condition being the angle of inclination. 12. The method of claim 10, further comprising: moving said brake piston between a first position and a second position so as to cause said valve means to release said first percentage and said second percentage. 13. The method of claim 10, said step of determining comprising: measuring a time between release of said first percentage and release of said second percentage; andcorrelating said time to the downhole condition. 14. The method of claim 11, a drill bit being interconnected to an end of said drilling sub, said step of sensing comprising sensing an angle of inclination of the drill bit, the method further comprising: assigning a time value to a sensed angle of inclination; andmoving said actuator piston between said first position and said second position at a time equal to said time value. 15. A method of communicating within a wellbore, the wellbore having a drilling mud circulation system therein, the circulation system being through a drill string, a drilling sub affixed to said drill string, and an interior of said wellbore, the method comprising: positioning a valve means in a fluid passageway of said drilling sub;positioning a brake with a brake piston in said drilling sub, said brake piston being cooperative with said valve means;sensing a quantifiable downhole condition;forming a flow restriction within the circulation system at said drilling sub, said flow restriction being comprised of said valve means and said brake;applying a quantified pressure of drilling mud in the circulation system against said flow restrictionreleasing a percentage of pressure across said valve means by activating said brake piston from a first receded fixed position to a subsequent receded fixed position at a time interval, said time interval being associated with the sensing of said quantifiable downhole condition;repeating the sensing and releasing according to subsequent quantifiable downhole conditions at subsequent time intervals; anddetermining downhole condition changes from a surface location by analysis of the time intervals. 16. The method of communicating within a wellbore, according to claim 15, the step of releasing said percentage of pressure by activating said brake piston comprising: activating a solenoid pilot valve to lock said valve means to a partially open position and said brake in said first receded fixed position.
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