IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0466460
(2009-05-15)
|
등록번호 |
US-8583378
(2013-11-12)
|
우선권정보 |
FR-08 53208 (2008-05-16) |
발명자
/ 주소 |
- Jacques, Antoine
- Boutaud De La Combe, Jean-Luc
- Berest, Pierre
- Brouard, Benoit
|
출원인 / 주소 |
|
대리인 / 주소 |
Patzik, Frank & Samotny Ltd.
|
인용정보 |
피인용 횟수 :
3 인용 특허 :
7 |
초록
▼
A well passing through a geological formation is fitted with a tube, open at its bottom end, that is filled with a fluid. Another fluid is in the annular space between the tube and the wall of the well, the two fluids exhibiting an interface situated in the annular space. A hydraulic balance of the
A well passing through a geological formation is fitted with a tube, open at its bottom end, that is filled with a fluid. Another fluid is in the annular space between the tube and the wall of the well, the two fluids exhibiting an interface situated in the annular space. A hydraulic balance of the fluids of the well is disturbed and the trend of certain quantities is measured. These measurements are moreover simulated by computer by using different sets of values for the physical parameters, and efforts are made to estimate the geological formation. A comparison of the measurements with the simulation results makes it possible to identify an optimum set of values for the parameters.
대표청구항
▼
1. Method of estimating physical parameters of a geological formation having a plurality of layers, comprising the following steps: equipping a well passing through the geological formation with a tube open at its bottom end;filling the tube and a bottom part of an annular space situated around the
1. Method of estimating physical parameters of a geological formation having a plurality of layers, comprising the following steps: equipping a well passing through the geological formation with a tube open at its bottom end;filling the tube and a bottom part of an annular space situated around the tube in the well with a first fluid;filling the rest of the annular space with at least one second fluid so that the fluids exhibit an interface in the annular space;disturbing a hydraulic balance of the fluids in the well;measuring the trend of quantities relating to properties of the fluids in the well based on all of the plurality of layers in contact with the first and second fluids;performing computer simulations of the hydraulic behaviour of the fluids having a disturbed balance in the well, each simulation using a model taking into account the plurality of layers, calculating a permeation flow rate of the first fluid into the layers of the plurality of layers in contact with the first fluid, calculating a permeation flow rate of the second fluid into the layers of the plurality of layers in contact with the second fluid, and using a set of values for said physical parameters of the plurality of layers of the geological formation and giving rise to a simulated trend of said quantities; andcomparing the measured and simulated trends of said quantities to identify an optimum set of values for said physical parameters of the plurality of layers of the geological formation. 2. Method according to claim 1, wherein said interface is successively positioned at different depths by adjusting the amount of the first and second fluids in the well, and, for each depth, the balance of the fluids is disturbed and the trend of the quantities is measured. 3. Method according to claim 1, wherein said interface is displaced between at least two depths by adjusting the amount of the first and second fluids in the well, and, while the interface is being displaced, the balance of the fluids is disturbed and the trend of the quantities is measured. 4. Method according to claim 1, wherein the hydraulic balance of the well is disturbed by injecting or subtracting a predetermined volume of fluid in the tube and/or in the annular space. 5. Method according to claim 1, wherein each simulation comprises an estimation of the permeation flow rates of the fluids towards the geological formation, then an estimation of the simulated trend of said quantities relating to properties of the fluids in the well. 6. Method according to claim 5, wherein each simulation also comprises an estimation of the depth of said interface in the annular space based on estimated permeation flow rates. 7. Method according to claim 1, wherein the first and second fluids are liquids. 8. Method according to claim 1, wherein said physical parameters comprise at least one parameter out of the permeability and the porosity of at least one layer of materials of the geological formation. 9. Method according to claim 1, wherein said physical parameters comprise the natural pressure of at least one layer of materials of the geological formation. 10. Method according to claim 1, wherein the first fluid is denser than the second fluid. 11. Method according to claim 1, wherein said quantities relating to properties of the fluids in the well comprise the depth of said interface along the annular space. 12. Method according to claim 1, wherein said quantities relating to properties of the fluids in the well comprise a flow rate of injection or removal of fluid at the well head. 13. Method according to claim 1, wherein the well is also fitted with a servo-control for one of the quantities relating to fluid properties. 14. Method according to claim 1, wherein the measurement sequences are executed in succession, each measurement sequence comprising: positioning said interface at a determined depth for said sequence by adjusting the amount of the first and second fluids in the well;disturbing a hydraulic balance of the fluids in the well by injecting or subtracting a predetermined volume of fluid in the tube and/or in the annular space. 15. Method according to claim 1, wherein said quantities relating to properties of the fluids in the well comprise a pressure inside the tube, and a pressure in the annular space. 16. Method according to claim 15, wherein said pressures are measured at the well head. 17. Method according to claim 16, wherein one of said pressures is considered to be a reference pressure, and wherein each measurement sequence comprises at least the following steps: (a1) displacing the interface in the well to a predetermined position,(a2) disturbing a balance of the fluids of the well by injecting a first volume of fluid, the reference pressure varying from an initial pressure value to a final pressure value,(a3) observing the variations of said pressures, and(a4) returning the fluids of the well to balance by subtracting a second volume of fluid, the reference pressure varying to roughly the initial pressure value. 18. Method according to claim 17, wherein, in the step (a1), said interface is positioned at a depth that is different from one measurement sequence to another. 19. Method according to claim 18, wherein the geological formation comprises several layers passed through by the well, and wherein, in the step (a1), said interface is positioned facing a different layer of materials from one measurement sequence to another. 20. Method according to claim 1, wherein one of said pressures is considered to be a reference pressure, and wherein each measurement sequence comprises at least the following steps: (a1) displacing the interface in the well to a predetermined position,(a2) disturbing a balance of the fluids of the well by injecting a first volume of fluid, the reference pressure varying from an initial pressure value to a final pressure value,(a3) observing the variations of said pressures, and(a4) returning the fluids of the well to balance by subtracting a second volume of fluid, the reference pressure varying to roughly the initial pressure value. 21. Method according to claim 20, wherein, in the step (a1), said interface is positioned at a depth that is different from one measurement sequence to another. 22. Method according to claim 18, wherein the geological formation comprises several layers passed through by the well, and wherein, in the step (a1), said interface is positioned facing a different layer of materials from one measurement sequence to another.
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