RU2686885C1 - Reservoir fluid sampler - Google Patents

Abstract

FIELD: sampling.SUBSTANCE: invention relates to hydrogeological investigations of wells and is intended for extraction of bottom-hole fluid samples in wells. Reservoir fluid sampler comprises a fluid sampling system with a reservoir fluid sampling and storage valve, a logic electrohydraulic system for fixing and releasing the sampler, which includes a first motor, which is connected to the first pump connected to the first distributor through the first check valve, to the first filter, to the first safety valve connected to the tank, wherein the pressure port of the first distributor is also connected to the second distributor and the reservoir fluid sampling and storage valve, wherein first distributor is connected to piston cavities of first, second and third hydraulic cylinders, rod cavities of which are connected to third distributor, to hydraulic accumulator and sensors, and second distributor is connected to drain cavity of third hydraulic cylinder via second check valve. Sampler comprises second and third filters of first tank, wherein sensors are made in form of first oil pressure sensor, second oil pressure sensor, first pressure sensor of reservoir fluid, reservoir fluid temperature sensor and connected to the first and second valves of the pumping module, which additionally includes the fourth distributor, the pressure cavity of which is connected through the third check valve to the fifth distributor, and the fourth distributor drain cavity is connected to the fifth distributor by the fourth check valve, wherein pressure port of second distributor is connected to pressure port of three-position distributor, and drain port through fifth check valve and second check valve is connected to drain port of three-position distributor, first port of which is connected to first storage chamber valve, and second port is connected to second storage chamber valve, fluid channels of which are connected to humidity sensor and resistivity sensor, and piston cavities are connected to sixth and seventh check valves, wherein the resistivity sensor is connected to the second formation pressure sensor which is connected to the pumping module, the rod of which is connected to the displacement sensor, and the oil ports of the pumping module are connected to the fifth distributor, the pressure chamber of which is connected to the third oil pressure sensor, and the drain cavity with the fourth filter, wherein the third oil pressure sensor is connected to the fifth filter through the eighth check valve and through the second safety valve, which drain cavity is connected to the sixth filter and to the second pump, which is connected to the second electric motor and to the fourth oil pressure sensor, which cavity is connected to equalizing valve, besides, all distributors are made with electromagnetic control and spring-return mechanism.EFFECT: claimed invention ensures high reliability of sampler, automation of sampling due to application of logic electrohydraulic system and selection of at least two qualitative samples of reservoir fluid per one descent of sampler into well.1 cl, 1 dwg

Description

The invention relates to hydro-geological studies of wells and is intended for sampling deep fluid samples in wells.

Known sampler (patent RU2199009, IPC Е21В 49/00, publ. 20.02.2003), which includes a system for remote control of the processes of unclamping, the influx of reservoir fluid, pressure recovery in the sub-packer or interpacker zone and the subsequent automatic unlocking.

A disadvantage of the known sampler is the presence of rubber elements that uncouple the sampler in the well and have a small resource due to the rapid wear of the material. The number of samples is limited — only one fluid sample can be obtained in one descent, which limits the functionality of the sampler.

Known sampler reservoir fluid (patent RU2371577, IPC Е21В49 / 08, publ. 10/27/2009), including a valve for sampling and storing a sample of formation fluid, an electric motor with a pump and filter, a first distributor with a check valve with a safety valve and a second distributor, the first, second, third and fourth pressure sensors, the first, second and third hydraulic cylinders, the rod end of which is connected to the third distributor and hydroaccumulator.

A disadvantage of the known solution is the arbitrary cleaning of the rods of the first, second and third cylinders during operation of the sampling valve and storing the reservoir fluid sample, the absence of valves that control the sampling process and storing the reservoir fluid sample, and that in the case of low flow rates, the working fluid from pump, the first, second and third valves work with low reliability, as they have hydraulic control.

The closest in technical essence and the achieved result to the proposed is a sampler of reservoir fluid (patent RU2465457, IPC Е21В49 / 08, publ. 10/27/2012), containing a valve for sampling and storing a sample of formation fluid, an electric motor, a pump, the first distributor with a check valve and with a filter, a safety valve with a second distributor, which is connected to the tank, the first, second, third and fourth pressure sensors, the first, second and third hydraulic cylinder, the drain cavity of which is connected to the third distribution elem and accumulator, to a fifth pressure sensor. The sampler also includes a system for regulating the sampling rate of formation fluid, which includes storage chambers with non-return valves, a hydraulic cylinder with a proportional flow regulator.

The disadvantages of the prototype include the absence of valves that control the process of sampling and storing samples of reservoir fluid, as well as the fact that in the case of low flow rates of the working fluid coming from the pump, the third distributor works with low reliability, since it has hydraulic control.

The objective of the invention is to increase the reliability of the reservoir fluid sampler and the expansion of functionality.

The technical result is increased reliability of the device. The task is solved, and the technical result is achieved by a reservoir fluid sampler, including a fluid sampling system with a sampling valve and storing a reservoir fluid sample, a logical electro-hydraulic system for fixing and uncoupling the sampler, which includes the first electric motor connected to the first pump the first valve through the first non-return valve, with the first filter, with the first safety valve connected to the tank, the pressure port of the first the distributor is also connected to the second distributor and sampling and storage valve of the reservoir fluid sample, the first distributor being connected to the piston cavities of the first, second and third hydraulic cylinders, the rod cavities of which are connected to the third distributor, to the accumulator and sensors, and the second distributor a hydraulic cylinder through a second check valve, characterized in that the sampler contains the second and third filters of the first tank, while the sensors are made in the form of a first about the oil pressure sensor, the second oil pressure sensor, the first pressure sensor of the reservoir fluid, the temperature sensor of the reservoir fluid, and are connected to the first and second valves of the pumping module, which additionally includes a fourth valve, the pressure chamber of which is connected through the third check valve to the fifth valve, and the drain the cavity of the fourth distributor is connected to the fifth distributor by means of the fourth check valve, and the pressure port of the second distributor is connected to the pressure port of three positions through the fifth check valve and the second check valve is connected to the drain port of the three-position distributor, the first port of which is connected to the valve of the first storage chamber, and the second port is connected to the valve of the second storage chamber, the fluid channels of which are connected to the humidity sensor and specific sensor resistance, and the piston cavities are connected to the sixth and seventh check valves, and the resistivity sensor is connected to the second reservoir pressure sensor, which is connected to the pumping module, the rod of which is connected to the displacement sensor, and the oil ports of the pumping module are connected to the fifth distributor, the pressure cavity of which is connected to the third oil pressure sensor, and the drain cavity to the fourth filter, and the third oil pressure sensor is connected to the fifth filter through the eighth check valve and through the second safety valve, the drain cavity of which is connected to the sixth filter and to the second pump, which is connected to the second electric motor and to the fourth oil pressure sensor, the cavity which is connected with a balancing valve, all valves are made with electromagnetic control and spring return mechanism.

Improving the reliability of the sampler is achieved by using the first, second, third, fourth, fifth distributors and three-position distributors, which are controlled by electromagnets and, unlike the prototype, their speed does not depend on the supply of the first pump. For reliable fixation of the sampler in the wellbore during sampling, eight check valves are provided, and six filters are provided for reliable operation of all valves.

The invention is illustrated by the drawing, which shows a schematic hydraulic diagram of the reservoir fluid sampler.

The diagram shows:

1. first electric motor

2. first pump

3. the first distributor

4. first check valve

5. first filter

6. first safety valve

7. second filter

8. tank

9. third filter

10. second distributor

11. sampling valve

12. first cylinder

13. third distributor

14. battery

15. second cylinder

16. The first oil pressure sensor

17. second oil pressure sensor

18. third cylinder

19. the first sensor pressure of the reservoir fluid

20. the second sensor pressure of the reservoir fluid

21. humidity sensor

22. temperature sensor

23. resistivity sensor

24. the first valve of the pumping module

25. second valve pumping module

26. pumping module

27. fourth distributor

28. third check valve

29. three position valve

30. fourth check valve

31. fifth check valve

32. valve of the first chamber

33. first camera

34. valve second chamber

35. second camera

36. sixth check valve of the first chamber

37. seventh check valve of the second chamber

38. second check valve

39. displacement sensor

40. fifth distributor

41. third oil pressure sensor

42. fourth filter

43. eighth check valve

44. second pump

45. fifth filter

46. second safety valve

47. sixth filter

48. fourth oil pressure sensor

49. balancing valve

50. second electric motor

The reservoir fluid sampler contains the first electric motor 1, which is connected to the first pump 2. The first pump 2 is connected to the first distributor 3 through the first check valve 4, to the first filter 5, to the first safety valve 6 and to the second filter 7, which is connected to the tank 8 and to the third filter 9. The first pump 2 is connected through the first filter 5 and the auxiliary pressure line to the second valve 10 of the sampling valve 11. The first valve 3 is connected to the first cylinder 12, which is connected to the third pipe The separator 13 and the accumulator 14, as well as to the second cylinder 15 with the first 16 and second 17 oil pressure sensors and to the third cylinder 18. The sampling valve 11 is connected to the first 19 and second 20 sensors of the pressure of the formation fluid, with a humidity sensor 21, a temperature sensor 22 and the resistivity sensor 23. The second sensor of the pressure of the reservoir fluid 20 is connected to the first 24 and the second 25 valves of the pumping module 26. The first 24 and second 25 valves of the pumping module 26 are connected to the fourth distributor 27, the pressure chamber of which is connected and through the third check valve 28 to the fifth distributor 40, and the drain cavity of the fourth valve 27 through the fourth check valve 30 is connected to the drain cavity of the fifth valve 40. The drain port of the second valve 10 is connected to the third hydraulic cylinder 18 through the second check valve 38, as well as through the fifth a check valve 31 with a three-position valve 29, the first port of which is connected to the valve 32 of the first chamber 33, the second port with the valve 34 of the second chamber 35, whose fluid cavities contain the sixth 36 and seventh 37 check valves. The stem of the pumping module 26 is connected to the displacement sensor 39, and the oil ports with the fifth distributor 40, the pressure cavity of which is connected to the third oil pressure sensor 41, and the drain cavity to the fourth filter 42. The third oil pressure sensor 41 is connected to the eighth check valve 43, which connected to the second pump 44 through the fifth filter 45. The eighth check valve 43 is also connected to the second safety valve 46, which in turn is connected to the sixth filter 47 and the fourth oil pressure sensor 48 with equalization valve 49. W The pump 44 is connected to the second electric motor 50.

The proposed sampler works as follows. An electric signal is applied to the first electric motor 1, which drives the first pump 2. The first pump 2 creates a working pressure in the system, controlled by the first safety valve 6 and the first 17 and second 16 oil pressure sensors, and also provides the set flow rate of the working fluid transmitted by the first distributor 3 into the piston cavities of the first 12, second 15, third 18 hydraulic cylinders and to the hydraulic accumulator 14 using the third distributor 13. At the same time with the first distributor 3, the third distributor 13 operates, which communicates the rod end of the first 12, second 15, third 18 hydraulic cylinders with a drain line. In the absence of a control signal, the first valve 3 communicates the piston cavities of the first 12, second 15 and third 18 hydraulic cylinders with a drain line, and the rod end cavities using the third valve 13 - with the hydraulic accumulator line 14, due to which the return pistons of all hydraulic cylinders occur. In case of failure of the hydraulic accumulator 14, the first distributor 3 communicates the rod cavities of the first 12, second 15, third 18 hydraulic cylinders with a pressure line, and piston cavities with a drain line, which allows uncoupling of the sampler in the presence of an electrical signal. For reliability of the hydraulic system, the first 5 and second 7 filters are installed at the inlet and at the outlet of the first pump 2, and the working fluid in the drain line of the first distributor 3 passes through the third filter 9 and further into the tank 8. After the first 12, second 15 and third rods 18 hydraulic cylinders, begins to make a reciprocating movement of the piston of the pumping module 26, which is controlled by the fifth valve 40, and the movement of the piston is recorded by the displacement sensor 39. To control the process of sampling and storing the sample The first 24 and second 25 control valves, which are controlled by the fourth distributor 27, the third 28, and the fourth 30 non-return valves, are used. The parameters of the reservoir fluid are monitored during sampling and storage by the first 19 and second 20 sensors of the pressure of the reservoir fluid, the resistivity sensor 23, the humidity sensor 21 and the temperature sensor of the reservoir fluid 22. To exclude an involuntary return stroke of the first 12, 15 cylinders during sampling and storage of the sample before entering the first hydraulic distributor 3, the first non-return valve 4 is installed. To control the process of sampling the first chamber 33 and chamber 35 uses the second three-position valve 29 and the first 32 and second 34 valves of the storage chambers, and when sampling the fluid channel can be blocked by the sampling valve 11, which is controlled by the second valve 10. For the involuntary actuation of the first 33 and second 35 chambers, as well as the selection valve samples 11 in the drain port of the second valve 10 and the three-position valve 29 are installed the second 38 and fifth 31 check valves, and to save the pressures of the reservoir fluid in the first 35 and second 35 chambers are installed above stop 36 and seventh 37 check valves. For pumping oil into the fifth valve 40, a second motor 50 is used in the system, which drives the second pump 44. For reliable operation of the pumping module 26, the fourth 42, fifth 45 and sixth 47 filters with the eighth check valve 43 and the second safety valve 46 are used. the inlet to the second pump 44 is equalized with the pressure of the well by means of a balancing valve 49, which is controlled by the fourth oil pressure sensor 48. At the outlet of the second pump 44, the pressure is controlled by the third sensor ohm oil pressure 41.

The claimed invention provides high reliability of the sampler, the automation of sampling through the use of a logical electro-hydraulic system and the selection of at least two high-quality samples of formation fluid during one descent of the sampler into the well. The advantage of the inventive sampler fluid reservoir is the high accuracy of the results due to the reliability of fixation and uncoupling of the sampler in the well and high performance through the use of a pumping module with a valve.

Claims (1)

Sampling fluid sampler, including a fluid sampling system with a sampling valve and storing fluid sampling, a logical electrohydraulic system for fixing and uncoupling the sampler, which includes the first electric motor connected to the first pump connected to the first distributor via the first non-return valve, with the first filter with the first safety valve connected to the tank, and the discharge port of the first distributor is also connected to the second valve and the valve and storing a sample of a reservoir fluid, the first distributor being connected to the piston cavities of the first, second and third hydraulic cylinders, the rod cavities of which are connected to the third distributor, to the hydraulic accumulator and sensors, and the second distributor connected to the drain cavity of the third hydraulic cylinder through a second non-return valve, distinguished by that the sampler contains the second and third filters of the first tank, while the sensors are made in the form of the first oil pressure sensor, the second oil pressure sensor, the first sensor The pressure of the reservoir fluid is ik, the temperature of the reservoir fluid temperature sensor is connected to the first and second valves of the pumping module, which additionally includes a fourth distributor, the pressure cavity of which is connected through the third check valve to the fifth distributor, and the drain cavity of the fourth distributor is connected to the fifth distributor , the pressure port of the second distributor is connected to the pressure port of the three-position distributor, and the drain port through the fifth check valve and the second check valve is connected to the drain port of the three-position distributor, the first port of which is connected to the valve of the first storage chamber, and the second port is connected to the valve of the second storage chamber, whose fluid channels are connected to the humidity sensor and resistivity sensor, and the piston cavities are connected to the sixth and seventh non-return valves, wherein the resistivity sensor is connected to the second sensor of the pressure of the reservoir fluid, which is connected to the pumping module, the rod of which is connected to the displacement sensor, and Oil ports of the pumping module are connected to the fifth distributor, the pressure cavity of which is connected to the third oil pressure sensor, and the drain cavity to the fourth filter, the third oil pressure sensor is connected to the fifth filter through the eighth check valve and through the second safety valve, the drain cavity of which is connected to the sixth filter and the second pump, which is connected to the second electric motor and the fourth oil pressure sensor, the cavity of which is connected to a balancing valve, all of the distributor formed and electromagnetically controlled spring-return mechanism.

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