IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0018212
(2011-01-31)
|
등록번호 |
US-8824241
(2014-09-02)
|
발명자
/ 주소 |
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
1 인용 특허 :
15 |
초록
▼
A method for a pressure release encoding system for communicating downhole information through a wellbore to a surface location includes positioning a valve and a brake in a drilling mud circulation system, initiating flow of drilling mud through the system, sensing flow through the valve and settin
A method for a pressure release encoding system for communicating downhole information through a wellbore to a surface location includes positioning a valve and a brake in a drilling mud circulation system, initiating flow of drilling mud through the system, sensing flow through the valve and setting the brake at predefined pressure levels, sensing downhole conditions and releasing corresponding percentages of pressure across the valve at time intervals, and determining the downhole conditions at the surface by analyzing those associated time intervals. The method includes activation of the encoding system using drilling mud flow and setting predefined pressure levels, so that the pressure drops in the encoding process are from predefined levels at equilibrium and independent of fluid flow.
대표청구항
▼
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;sensing a quantifiable downhole condition;initiating a flow of drilling mud through said circulation system;forming a flow restriction within the circulation system at said drilling sub, said flow restriction being said valve means;sensing said flow of drilling mud through said valve means, wherein said valve means is opened according to a predefined pressure drop across said valve means;activating said brake piston from a first receded fixed position to a second receded fixed position so as to allow said valve means to release a first percentage of 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 activating said brake piston from said first receded fixed position comprising: switching on a solenoid pilot valve to lock said valve means to a partially open position and said brake in a set position; andpopping off said brake from said set position to said first receded fixed position, corresponding to a predetermined first starting pressure across said valve means. 3. The method of communicating within a wellbore, according to claim 1, said step of sensing said quantifiable downhole condition comprising: sensing an angle of the drilling sub, said drilling sub being aligned with said wellbore, said downhole condition being the angle of inclination. 4. The method of communicating within a wellbore, according to claim 1, wherein the step of activating said brake piston comprises: setting said first receded position at a first equilibrium state of said valve means before said release of said first percentage of pressure; andsetting said second receded position at a second equilibrium state of said valve means,wherein the step of releasing said second percentage of pressure follows the step of setting said second receded position at said second equilibrium state of said valve means. 5. 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. 6. The method of communicating within a wellbore, according to claim 4, 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. 7. The method of communicating within a wellbore, according to claim 3, wherein the drilling string has a bit sub interconnected thereto, 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 for said first release of pressure and said second receded fixed position for said second release of pressure at a time equal to said time value. 8. 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 activating 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. 9. The method of communicating within a wellbore, according to claim 8, 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. 10. 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. 11. 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;initiating a flow of drilling mud through said circulation system;forming a flow restriction within the circulation system at said drilling sub, said flow restriction being said valve means;sensing said flow of drilling mud through said valve means, wherein said valve means is opened according to a predefined pressure drop across said valve means;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. 12. The method of communicating within a wellbore, according to claim 11, said step of releasing said first percentage of pressure comprising: activating said brake piston from a first receded fixed position to a second receded fixed position, wherein said first receded fixed position is set by activating a solenoid pilot valve to lock said valve means to a partially open position and said brake in a set position and popping off said brake from said set position to said first receded fixed position, corresponding to a predetermined first starting pressure across said valve means. 13. The method of communicating within a wellbore, according to claim 11, further comprising the step of: increasing flow restriction to an original state when flow through the flow restriction has returned to zero. 14. The method of claim 11, 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. 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 and a drilling sub affixed to said drill string, and being movable within 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;initiating a flow of drilling mud through said circulation system;forming a flow restriction within the circulation system at said drilling sub, said flow restriction being said valve means;sensing said flow of drilling mud through said valve means, wherein said valve means is opened according to a predefined pressure drop across said valve means and wherein said brake is placed in a set position;popping off said brake from said set position to a first receded fixed position, corresponding to a predetermined first starting pressure across said valve means;releasing a percentage of pressure across said valve means by activating said brake piston from said 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.
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