Sampling device of formation tester

Abstract

The invention discloses a formation tester sampling device which comprises an upper connector module, a control module, a sampling barrel module, a switching module, a lower connector module and an electric fluid bus, and the electric fluid bus sequentially penetrates through the upper connector module, the control module, the sampling barrel module, the switching module and the lower connector module. A sample cavity and a slurry cavity corresponding to the sample cavity are formed in the sampling barrel module, and the sample cavity and the slurry cavity are arranged to be capable of storing corresponding media by correspondingly changing the volumes of the sample cavity and the slurry cavity; the electric fluid bus comprises a fluid pipeline, a pressure pipeline and an oil return pipeline, the fluid pipeline is communicated with the sample cavity through a branch pipeline, the branch pipeline is provided with an on-off sample transfer port, and the control module is respectively connected with the fluid pipeline and the pressure pipeline and is used for controlling the on-off of the branch pipeline. According to the invention, the sampling device of the formation tester meets the requirement of inverted hooking operation, and the problem that the capacity of the sampling barrel is relatively small can be improved, so that the requirement of on-site large-capacity conventional sampling is met.

Description

Technical Field

[0001] The invention belongs to the technical field of oil well sampling, and in particular relates to a formation tester sampling device. Background Art

[0002] The development of offshore oil and gas resources is the hotspot and focus of the current development of the world's marine economy. Offshore oil and gas resources are not only large in reserves, but modern science and technology have already possessed great capabilities for their development. The offshore oil and gas industry has developed into an emerging and high-value-added leading industry in the marine economy. At present, with the promotion and application of EFDT formation testers, the demand for inverted instrument string operation configuration is becoming more and more urgent.

[0003] However, the sampling device in the related art has no through-fluid and electrical bus, and can only be connected to the bottom of the instrument string, which cannot meet the requirements of inverted hanging operation of the bottom test instrument, and the richness of instrument configuration and functions are limited. At the same time, the sampling device in the related art has limited volume, which cannot meet the needs of large-capacity conventional sampling on site, and needs to be improved. Summary of the invention

[0004] In order to solve all or part of the above-mentioned problems, the purpose of the present invention is to provide a formation tester sampling device, in which the fluid and electrical buses run through the formation tester sampling device to meet the inverted hanging operation requirements of the formation tester sampling device, improve the richness of instrument configuration and functional diversity, and improve the problem of small sampling tube capacity to meet the needs of large-capacity conventional sampling on site.

[0005] The present invention provides a formation tester sampling device, comprising an upper joint module, a control module, a sampling barrel module, a switching module, a lower joint module and an electrical fluid bus, wherein the upper joint module, the control module, the sampling barrel module, the switching module and the lower joint module are connected in sequence, and the electrical fluid bus passes through the upper joint module, the control module, the sampling barrel module, the switching module and the lower joint module in sequence;

[0006] The sampling tube module is provided with a sample cavity and a mud cavity corresponding to the sample cavity, the sample cavity and the mud cavity are configured to store corresponding media by correspondingly changing their own volumes, and the mud cavity is provided with a mud port that can be switched on and off;

[0007] The electrical fluid bus includes a fluid pipeline, a pressure pipeline and an oil return pipeline. The fluid pipeline is connected to the sample chamber through a branch pipeline. The branch pipeline is provided with a sample transfer port that can be opened and closed. The control module is respectively connected to the fluid pipeline and the pressure pipeline, and is used to control the opening and closing of the branch pipeline.

[0008] Optionally, the sampling cylinder module includes a sampling cylinder body, a piston and a wire passing tube, the wire passing tube is coaxially arranged in the sampling cylinder body, the piston is sealed and slidably connected between the wire passing tube and the sampling cylinder body, the piston divides the interior of the sampling cylinder body into the sample chamber and the mud chamber, and the fluid pipeline, the pressure pipeline and the return oil pipeline respectively pass through the wire passing tube.

[0009] Optionally, the sampling cylinder includes an upper cylinder, an intermediate joint and a lower cylinder connected in sequence, the piston includes an upper piston arranged in the upper cylinder and a lower piston arranged in the lower cylinder, the lower cylinder is provided with a first mud port, and the intermediate joint is provided with a second mud port that can be switched on and off;

[0010] The sample chamber includes a first sample chamber and a second sample chamber, and the mud chamber includes a first mud chamber and a second mud chamber. The first sample chamber and the first mud chamber are separated in the upper cylinder by the upper piston, and the second sample chamber and the second mud chamber are separated in the lower cylinder by the lower piston. The first mud chamber and the second mud chamber are arranged near the middle joint and are respectively connected to the second mud port.

[0011] Optionally, the branch pipeline includes a first sample line and a second sample line, the first sample line connects the fluid line and the first sample chamber, the second sample line connects the fluid line and the second sample chamber, and the sample transfer port includes a first sample transfer port arranged on the first sample line and a second sample transfer port arranged on the second sample line.

[0012] Optionally, the control module includes a first mechanical valve and a first manual valve arranged on the first sample pipeline, a second mechanical valve and a second manual valve arranged on the second sample pipeline, a first solenoid valve connecting the pressure line and the first mechanical valve, and a third solenoid valve connecting the pressure line and the second mechanical valve.

[0013] Optionally, the control module further includes a second solenoid valve connecting the first solenoid valve and the third solenoid valve.

[0014] Optionally, the sampling cylinder is configured as a long cylinder, the piston includes an intermediate piston, the sample chamber includes a third sample chamber, the mud chamber includes a third mud chamber, and the third sample chamber and the third mud chamber are separated in the sampling cylinder by the intermediate piston.

[0015] Optionally, the branch pipeline includes a third sample pipeline and / or a fourth sample pipeline, the third sample pipeline connects the fluid pipeline with the third sample chamber, and / or the fourth sample pipeline connects the fluid pipeline with the third mud chamber;

[0016] The sample transfer port includes a first sample transfer port disposed on the third sample line, and / or a second sample transfer port disposed on the fourth sample line.

[0017] Optionally, the control module includes a first mechanical valve and a first manual valve arranged on the third sample pipeline, a second mechanical valve and a second manual valve arranged on the fourth sample pipeline, a first solenoid valve connecting the pressure line and the first mechanical valve, and a third solenoid valve connecting the pressure line and the second mechanical valve.

[0018] Optionally, the control module further includes a second solenoid valve connecting the first solenoid valve and the third solenoid valve.

[0019] It can be seen from the above technical solution that the formation tester sampling device provided by the present invention has the following advantages:

[0020] (1) The formation tester sampling device adopts a modular design. At the same time, the electrical fluid bus runs through the entire device, which enables the formation tester sampling device to be hung at any position in the instrument string, thereby enriching the configuration of the instrument string and increasing the flexibility of the instrument string in sampling operations;

[0021] (2) The formation tester sampling device can take two independent sampling volumes of body samples, each sampling volume can be controlled separately, which is convenient for taking formation fluid samples at different points;

[0022] (3) The formation tester sampling device can obtain a fluid sample with a larger sampling volume by replacing a cylinder, thereby realizing the replacement of two sampling volume modes to meet the large-capacity and multi-requirement sampling needs of the instrument.

[0023] Other features and advantages of the present invention will be set forth in the description which follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings are used to provide a further understanding of the technical solution of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the technical solution of the present invention and do not constitute a limitation on the technical solution of the present invention.

[0025] Figure 1 This is a schematic diagram of the overall structure of the formation tester sampling device in Example 1 of the present invention;

[0026] Figure 2 This is a schematic diagram of the structure of the formation tester sampling device in Example 1 of the present invention;

[0027] Figure 3 This is a schematic diagram of the structure of the electrical fluid bus in Example 1 of the present invention;

[0028] Figure 4 This is a schematic diagram of the overall structure of the formation tester sampling device in Example 2 of the present invention;

[0029] Figure 5 It is a schematic diagram of the structure of the formation tester sampling device in Example 2 of the present invention;

[0030] Figure 6 Schematic diagram of the structure of the electrical fluid bus in Example 2 of the present invention. DETAILED DESCRIPTION

[0031] To make the purpose, technical solution and advantages of the present invention more clear, the embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the embodiments and features in the embodiments of the present invention can be combined with each other arbitrarily without conflict.

[0032] Example 1

[0033] like Figure 1 , Figure 2 , Figure 3 Embodiment 1 of the present invention is shown, in which a formation tester sampling device is disclosed, including an upper joint module 1, a control module 2, a sampling tube module 3, an adapter module 4, a lower joint module 5 and an electrical fluid bus 6. The upper joint module 1, the control module 2, the sampling tube module 3, the adapter module 4 and the lower joint module 5 are connected in sequence, and the electrical fluid bus 6 passes through the upper joint module 1, the control module 2, the sampling tube module 3, the adapter module 4 and the lower joint module 5 in sequence.

[0034] Reference Figure 1 , Figure 2 The sampling tube module 3 is provided with a sample chamber 31 and a mud chamber 32 corresponding to the sample chamber 31. The sample chamber 31 and the mud chamber 32 are configured to store corresponding media by correspondingly changing their own volumes. At the same time, the mud chamber 32 is provided with switchable mud ports (Q1, Q2).

[0035] Reference Figure 1 , Figure 2 , Figure 3 The electrical fluid bus 6 includes a fluid pipeline 61, a pressure pipeline 62 and an oil return pipeline 63. The fluid pipeline 61 is connected to the sample chamber 31 through a branch pipeline, and a switchable sample transfer port (Z1, Z2) is provided on the branch pipeline. At the same time, the control module 2 is connected to the pressure pipeline 62 and the fluid pipeline 61 respectively, and is used to control the branch pipeline to be switched on and off.

[0036] When the formation tester sampling device is used, the formation tester sampling device is connected in series with the instrument and then inserted into the well. As the depth of the well increases, the wellbore fluid enters the mud chamber 32 from the mud port (Q1, Q2). Under the action of the wellbore fluid, the cavity of the mud chamber 32 increases and the cavity of the sample chamber 31 decreases until the cavity of the sample chamber 31 reaches the minimum.

[0037] When the instrument string reaches the operation point and meets the sampling conditions, the control device 2 connects the fluid pipeline 61 with the sample chamber 31, controls the sample transfer ports (Z1, Z2) to be closed, and the mud ports (Q1, Q2) to be opened. At this time, the sample liquid in the fluid pipeline 61 enters the sample chamber 31. Under the action of the pumping pressure, the sample liquid is continuously filled into the sample chamber 31, so that the cavity of the sample chamber 31 increases, while the cavity of the mud chamber 32 gradually decreases, and the wellbore fluid is discharged from the mud ports (Q1, Q2). When the sample chamber 32 is filled with the sample liquid, the control device 2 controls the fluid pipeline 61 to be disconnected from the sample chamber 31, so that the sample liquid is enclosed in the sample chamber 31, thereby completing the sampling operation.

[0038] When the instrument serial sampling operation is completed and reaches the ground, the sample transfer port (Z1, Z2) is connected to the sample transfer device and the sample transfer port (Z1, Z2) is opened. At the same time, the mud port (Q1, Q2) is connected to the high-pressure gas source, and high-pressure gas is blown from the mud port (Q1, Q2) to increase the cavity of the mud cavity 32. At this time, the sample in the sample cavity 31 enters the sample storage bottle through the sample transfer port (Z1, Z2), thereby completing the sample transfer operation.

[0039] The formation tester sampling device in the embodiment of the present invention adopts a modular design, and the electrical fluid bus 6 runs through the entire device, so that the formation tester sampling device can be hung at any position in the instrument string, thereby enriching the instrument string configuration and increasing the flexibility of the instrument string in sampling operations.

[0040] Reference Figure 1 , Figure 2 The sampling cylinder module 3 includes a sampling cylinder body 33, a piston 34 and a wire passing tube 35. The wire passing tube 35 is coaxially arranged in the sampling cylinder body 33, and one end of the wire passing tube 35 is fixedly connected to the control module 2, and the other end is fixedly connected to the adapter module 4. The piston 34 is annular, and the piston 34 is sealed and slidably connected between the sampling cylinder body 33 and the wire passing tube 35, that is, the piston 34 is slidably sleeved on the wire passing tube 35, and the inner wall of the piston 34 is tightly abutted against the outer wall of the wire passing tube 35, and the outer wall of the piston 34 is tightly abutted against the inner wall of the sampling cylinder body 33 to achieve a sealed sliding fit.

[0041] Reference Figure 1 , Figure 2The piston 34 divides the interior of the sampling cylinder 33 into a sample chamber 31 and a mud chamber 32. The fluid pipeline 61, the pressure pipeline 62 and the return oil pipeline 63 pass through the wire pipe 35 respectively. That is, the fluid pipeline 61, the pressure pipeline 62 and the return oil pipeline 63 are routed inside the wire pipe 35.

[0042] Since the fluid pipeline 61, the pressure pipeline 62 and the return oil pipeline 63 are arranged through the wire pipe 35, the arrangement of the fluid pipeline 61, the pressure pipeline 62 and the return oil pipeline 63 is more flexible, and the protection of the fluid pipeline 61, the pressure pipeline 62 and the return oil pipeline 63 is achieved, and the modular configuration of the formation tester sampling device can be further made more diverse.

[0043] Reference Figure 1 , Figure 2 The sampling cylinder 33 includes an upper cylinder 331, an intermediate joint 332 and a lower cylinder 333 which are connected in sequence. The piston 34 includes an upper piston 341 arranged in the upper cylinder 331 and a lower piston 342 arranged in the lower cylinder 333. The intermediate joint 332 is provided with a second mud port Q1 which can be switched on and off, and the lower cylinder 333 is provided with a first mud port Q2.

[0044] Reference Figure 1 , Figure 2 The sample chamber 31 includes a first sample chamber U1 and a second sample chamber D2, and the mud chamber 32 includes a first mud chamber U2 and a second mud chamber D1, that is, the upper piston 341 divides the interior of the upper cylinder 331 into the first sample chamber U1 and the first mud chamber U2, and the lower piston 342 divides the lower cylinder 333 into the second sample chamber D2 and the second mud chamber D1. At the same time, the first mud chamber U2 and the second mud chamber D1 are close to the middle joint 332 and are respectively connected to the second mud port Q1.

[0045] Reference Figure 1 , Figure 2 The branch pipeline includes a first sample pipeline 611 and a second sample pipeline 612. The first sample pipeline 611 connects the fluid pipeline 61 with the first sample chamber U1, and the second sample pipeline 612 connects the fluid pipeline 61 with the second sample chamber D2. The sample transfer port includes a first sample transfer port Z1 disposed in the first sample pipeline 611 and a second sample transfer port Z2 disposed in the second sample pipeline 612.

[0046] Reference Figure 2 , Figure 3The control module 2 includes a first mechanical valve V1 and a first manual valve F1 arranged on the first sample pipeline 611, a second mechanical valve V2 and a second manual valve F2 arranged on the second sample pipeline 612, a first solenoid valve S1 connecting the pressure pipeline 62 and the first mechanical valve V1, a third solenoid valve S3 connecting the pressure pipeline 62 and the second mechanical valve V2, and a second solenoid valve S2 connecting the first solenoid valve S1 and the third solenoid valve S3.

[0047] The formation tester sampling device has two sampling modes, which are described as follows:

[0048] Mode 1: Dual-tube sampling (two sampling tubes sample the sample liquid separately)

[0049] Before the formation tester sampling device is lowered into the well, the first sample transfer port Z1 is controlled to be in a closed state, the first manual valve F1 is in an open state, the second mud port Q1 is in an open state, and the first mud port Q2 is in a closed state. When the formation tester sampling device is connected to the instrument and serially inserted into the well, the wellbore fluid enters the first mud chamber U2 and the second mud chamber D1 of the sampling barrel 33 from the second mud port Q1 on the intermediate joint 332. Under the pressure of the wellbore fluid, the upper piston 341 moves along the wire tube 35 to the leftmost end of the first sample chamber U1. Similarly, the lower piston 342 moves along the wire tube 35 to the rightmost end of the second sample chamber D2.

[0050] When the sampling conditions are met, the first solenoid valve S1 is opened, and the high-pressure hydraulic oil in the pressure pipeline 62 opens the first mechanical valve V1. At this time, the sample liquid in the fluid pipeline 61 flows through the first mechanical valve V1, the first sample transfer port Z1, and the first manual valve F1, and enters the first sample chamber U1 through the upper sample inlet J1. Under the action of the pumping pressure, the sample liquid is continuously filled into the first sample chamber U1, and the upper piston 341 moves to the right along the wire pipe 35, so that the wellbore fluid in the first mud chamber U2 is discharged through the second mud port Q1 on the intermediate joint 332. When the first sample chamber U1 is filled with sample liquid, the first solenoid valve S1 is closed and the second solenoid valve S2 is opened, so that the first mechanical valve V1 can be closed, and the sample is sealed in the first sample chamber U1, thereby completing the sampling operation of the upper cylinder 331.

[0051] Before the instrument string reaches another operation point and goes down the well, the second sample transfer port Z2 is controlled to be in a closed state, the second manual valve F2 is in an open state, the second mud port Q1 is in an open state, and the first mud port Q2 is in a closed state. After the reciprocating pump discharges the sample to meet the sampling conditions, the third solenoid valve S3 is opened, and the high-pressure hydraulic oil in the pressure pipeline 62 opens the second mechanical valve V2. At this time, the sample liquid in the fluid pipeline 61 flows through the second mechanical valve V2, the second sample transfer port Z2, the second manual valve F2, and enters the second sample chamber D2 through the lower sample inlet J2. Under the action of the pumping pressure, the sample liquid is continuously filled into the second sample chamber D2, and the lower piston 342 moves to the left along the wire pipe 35, so that the wellbore fluid in the second mud chamber D1 is discharged through the second mud port Q1 on the intermediate joint 332. When the second sample chamber D2 is filled with the sample, the third solenoid valve S3 is closed and the second solenoid valve S2 is opened, so that the second mechanical valve V2 can be closed to seal the sample liquid in the second sample chamber D2, thereby completing the sampling operation of the lower cylinder 333.

[0052] When the instrument serial sampling operation is completed and reaches the ground, the first manual valve F1 is closed, the first sample transfer port Z1 is connected to the sample transfer device, and the first manual valve F1 is opened. High-pressure gas is blown from the second mud port Q1 on the intermediate joint 332 to drive the upper piston 341 to move leftward along the wire tube 35, and the sample in the first sample chamber U1 passes through the upper sample inlet J1, the first manual valve F1, and the first sample transfer port Z1 into the sample storage bottle, thereby completing the sample transfer operation of the upper cylinder 331. Similarly, the second manual valve F2 is closed, the second sample transfer port Z2 is connected to the sample transfer device, and the second manual valve F2 is opened. High-pressure gas is blown from the second mud port Q1 on the intermediate joint 332 to drive the lower piston 342 to move rightward along the wire tube 35, and the sample in the second sample chamber D2 passes through the lower sample inlet J2, the second manual valve F2, and the second sample transfer port Z2 into the sample storage bottle, thereby completing the sample transfer operation of the lower cylinder 333.

[0053] Mode 2: Single-cylinder sampling (sampling the sample liquid through only one sampling cylinder)

[0054] Before the formation tester sampling device is lowered into the well, the first sample transfer port Z1 is controlled to be in a closed state, the first manual valve F1 is in an open state, the second mud port Q1 is in an open state, and the first mud port Q2 is in an open state. When the formation tester sampling device is connected to the instrument and connected to the well, the wellbore fluid enters the first mud chamber U2, the second mud chamber D1, and the second sample chamber D2 from the second mud port Q1 and the first mud port Q2. Under the pressure of the wellbore fluid, the upper piston 341 moves along the wire tube 35 to the leftmost end of the first sample chamber U1, and the lower piston 342 is located in the middle of the lower cylinder 333, and a dynamic balance is achieved.

[0055] When the sampling conditions are met, the first solenoid valve S1 is opened, and the high-pressure hydraulic oil in the pressure pipeline 62 opens the first mechanical valve V1. At this time, the sample liquid in the fluid pipeline 61 flows through the first mechanical valve V1, the first sample transfer port Z1, and the first manual valve F1, and enters the first sample chamber U1 through the upper sample inlet J1. Under the action of the pumping pressure, the sample liquid is continuously filled into the first sample chamber U1, and the upper piston 341 moves to the right along the wire pipe 35, so that the wellbore fluid in the first mud chamber U2 is discharged through the second mud port Q1 on the intermediate joint 332. When the first sample chamber U1 is filled with sample liquid, the first solenoid valve S1 is closed and the second solenoid valve S2 is opened, so that the first mechanical valve V1 can be closed, and the sample is sealed in the first sample chamber U1, thereby completing the sampling operation of the upper cylinder 331.

[0056] When the instrument serial sampling operation is completed and reaches the ground, the first manual valve F1 is closed, the first sample transfer port Z1 is connected to the sample transfer device, and the first manual valve F1 is opened. High-pressure gas is blown from the second mud port Q1 on the middle joint 332 to drive the upper piston 341 to move leftward along the wire pipe 35, and the sample in the first sample chamber U1 passes through the upper sample inlet J1, the first manual valve F1, and the first sample transfer port Z1 into the sample storage bottle, thereby completing the sample transfer operation of the upper cylinder 331.

[0057] The formation tester sampling device in this embodiment can take body samples of two independent sampling volumes, and each sampling volume can be controlled separately, which is convenient for taking formation fluid samples at two different points. At the same time, it can also sample sample liquids at two different layers, making the sampling operation more convenient.

[0058] Not only that, the bottom tester sampling device can meet a variety of sampling needs. When the staff needs to take a small amount of sample liquid, they can choose the single-barrel sampling mode. If the staff needs to take samples from the same location twice, or take samples from different locations separately, they can choose the double-barrel sampling mode. The operation is more flexible and varied to meet different sampling needs.

[0059] Example 2

[0060] like Figure 4 , Figure 5 , Figure 6 The embodiment 2 of the present invention is shown, which is different from the embodiment 1 in that the sampling cylinder 33 is configured as a long cylinder 334, and the long cylinder 334 is at least the sum of the lengths of the two sampling cylinders in the embodiment 1. The piston 34 includes an intermediate piston 343, the sample chamber 31 includes a third sample chamber A1, the mud chamber 32 includes a third mud chamber A2, and the intermediate piston 343 divides the long cylinder 334 into the third sample chamber A1 and the third mud chamber A2.

[0061] Reference Figure 4 , Figure 5 The branch pipeline includes a third sample pipeline 613 and / or a fourth sample pipeline 614. The third sample pipeline 613 connects the fluid pipeline 61 with the third sample chamber A1, and / or the fourth sample pipeline 614 connects the fluid pipeline 61 with the third mud chamber A2. The sample transfer port includes a first sample transfer port Z1 disposed in the third sample pipeline 613, and / or a second sample transfer port Z2 disposed in the fourth sample pipeline 614.

[0062] Reference Figure 5 , Figure 6 The control module 2 includes a first mechanical valve V1 and a first manual valve F1 arranged on the third sample pipeline 613, a second mechanical valve V2 and a second manual valve F2 arranged on the fourth sample pipeline 614, a first solenoid valve S1 connecting the pressure pipeline 62 and the first mechanical valve V1, a third solenoid valve S3 connecting the pressure pipeline 62 and the second mechanical valve V2, and a second solenoid valve S2 connecting the first solenoid valve S1 and the third solenoid valve S3.

[0063] Compared with Example 1, this embodiment only requires removing the upper cylinder 331, the middle joint 332, the lower cylinder 333 and a piston (341 or 342), and replacing the long cylinder 334 to meet the sampling operation requirements of large volume sample liquid.

[0064] Before the formation tester sampling device is connected to the instrument string and lowered into the well, the first sample transfer port Z1 is controlled to be in a closed state, the first manual valve F1 is in an open state, the second manual valve F2 is in a closed state, and the first mud port Q2 is in an open state. After the formation tester sampling device is connected to the instrument string and lowered into the well, as the depth of the well increases, the wellbore fluid will enter the third mud chamber A2 from the first mud port Q2. Under the action of pressure, the intermediate piston 343 moves along the wire tube 35 to the leftmost end of the third sample chamber A1.

[0065] After the instrument string reaches the operation point and the sample is discharged by the reciprocating pump to meet the sampling conditions, the first solenoid valve S1 is opened, and the high-pressure hydraulic oil in the pressure pipeline 62 opens the first mechanical valve V1. At this time, the sample liquid in the fluid pipeline 61 flows through the first mechanical valve V1, the first sample transfer port Z1, the first manual valve F1, and enters the third sample chamber A1 through the upper sample inlet J1. Under the action of the pumping pressure, the sample liquid is continuously filled into the third sample chamber A1, and the intermediate piston 343 moves to the right along the wire pipe 35, so that the wellbore fluid in the third mud chamber A2 is discharged from the first mud port Q2. When the third sample chamber A1 is full of samples, the first solenoid valve S1 is closed and the second solenoid valve S2 is opened, so that the first mechanical valve V1 can be closed, and the sample is sealed in the third sample chamber A1, thereby completing the sampling operation of the third sample chamber A1.

[0066] When the instrument serial sampling operation is completed and reaches the ground, close the first manual valve F1, open the first sample transfer port Z1 to connect the sample transfer device, and then open the first manual valve F1, blow high-pressure gas from the first mud port Q2, drive the intermediate piston 343 to move left along the wire pipe 35, and the sample in the third sample chamber A1 passes through the upper sample inlet J1, the first manual valve F1, and the first sample transfer port Z1 into the sample storage bottle, thereby completing the sample transfer operation of the sampling tube module 3.

[0067] In other embodiments, a fourth sample line 614 and a second mechanical valve V2 and a second manual valve F2 are added. In this configuration, the fourth sample line 614 can be used when needed. In the above embodiment, the fourth sample line 614 is in a closed state.

[0068] The formation tester sampling device in this embodiment meets the needs of large-volume sample liquid sampling operations, and only by replacing the cylinder, a fluid sample with a larger sampling volume can be taken, thereby realizing the replacement of two sampling volume modes and meeting the instrument's large-capacity and multi-requirement sampling needs.

[0069] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the present invention should have the common meanings understood by those skilled in the art to which the present invention belongs.

[0070] In addition, the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the present invention, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0071] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A formation tester sampling device, characterized in that: It includes an upper joint module, a control module, a sampling barrel module, an adapter module, a lower joint module and an electrical fluid bus, wherein the upper joint module, the control module, the sampling barrel module, the adapter module and the lower joint module are connected in sequence, and the electrical fluid bus passes through the upper joint module, the control module, the sampling barrel module, the adapter module and the lower joint module in sequence; The sampling tube module is provided with a sample cavity and a mud cavity corresponding to the sample cavity, the sample cavity and the mud cavity are configured to store corresponding media by correspondingly changing their own volumes, and the mud cavity is provided with a mud port that can be switched on and off; The electrical fluid bus includes a fluid pipeline, a pressure pipeline and an oil return pipeline. The fluid pipeline is connected to the sample chamber through a branch pipeline. The branch pipeline is provided with a sample transfer port that can be opened and closed. The control module is respectively connected to the fluid pipeline and the pressure pipeline, and is used to control the opening and closing of the branch pipeline.

2. The formation tester sampling device according to claim 1, characterized in that: The sampling cylinder module includes a sampling cylinder body, a piston and a wire passing tube. The wire passing tube is coaxially arranged in the sampling cylinder body. The piston is sealed and slidably connected between the wire passing tube and the sampling cylinder body. The piston divides the interior of the sampling cylinder body into the sample chamber and the mud chamber, and the fluid pipeline, the pressure pipeline and the return oil pipeline pass through the wire passing tube respectively.

3. The formation tester sampling device according to claim 2, characterized in that: The sampling cylinder includes an upper cylinder, an intermediate joint and a lower cylinder connected in sequence, the piston includes an upper piston arranged in the upper cylinder and a lower piston arranged in the lower cylinder, the lower cylinder is provided with a first mud port, and the intermediate joint is provided with a second mud port that can be switched on and off; The sample chamber includes a first sample chamber and a second sample chamber, and the mud chamber includes a first mud chamber and a second mud chamber. The first sample chamber and the first mud chamber are separated in the upper cylinder by the upper piston, and the second sample chamber and the second mud chamber are separated in the lower cylinder by the lower piston. The first mud chamber and the second mud chamber are arranged near the middle joint and are respectively connected to the second mud port.

4. The formation tester sampling device according to claim 3, characterized in that: The branch pipeline includes a first sample pipeline and a second sample pipeline, the first sample pipeline connects the fluid pipeline and the first sample chamber, the second sample pipeline connects the fluid pipeline and the second sample chamber, and the sample transfer port includes a first sample transfer port arranged on the first sample pipeline and a second sample transfer port arranged on the second sample pipeline.

5. The formation tester sampling device according to claim 4, characterized in that: The control module includes a first mechanical valve and a first manual valve arranged on the first sample pipeline, a second mechanical valve and a second manual valve arranged on the second sample pipeline, a first solenoid valve connecting the pressure pipeline and the first mechanical valve, and a third solenoid valve connecting the pressure pipeline and the second mechanical valve.

6. The formation tester sampling device according to claim 5, characterized in that: The control module further includes a second solenoid valve connecting the first solenoid valve and the third solenoid valve.

7. The formation tester sampling device according to claim 2, characterized in that: The sampling cylinder is configured as a long cylinder, the piston includes a middle piston, the sample chamber includes a third sample chamber, the mud chamber includes a third mud chamber, and the third sample chamber and the third mud chamber are separated in the sampling cylinder by the middle piston.

8. The formation tester sampling device according to claim 7, characterized in that: The branch pipeline includes a third sample pipeline and / or a fourth sample pipeline, the third sample pipeline connects the fluid pipeline with the third sample chamber, and / or the fourth sample pipeline connects the fluid pipeline with the third mud chamber; The sample transfer port includes a first sample transfer port disposed on the third sample line, and / or a second sample transfer port disposed on the fourth sample line.

9. The formation tester sampling device according to claim 8, characterized in that: The control module includes a first mechanical valve and a first manual valve arranged on the third sample pipeline, a second mechanical valve and a second manual valve arranged on the fourth sample pipeline, a first solenoid valve connecting the pressure pipeline and the first mechanical valve, and a third solenoid valve connecting the pressure pipeline and the second mechanical valve.

10. The formation tester sampling device according to claim 9, characterized in that: The control module further includes a second solenoid valve connecting the first solenoid valve and the third solenoid valve.

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