A formation tester sampling device

Abstract

The present invention discloses a formation tester sampling device, comprising 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 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; a sample chamber and a mud chamber corresponding to the sample chamber are provided in the sampling barrel module, and the sample chamber and the mud chamber are configured to store corresponding media by correspondingly changing their own volumes; the electrical fluid bus comprises a fluid pipeline, a pressure pipeline, and an oil return pipeline, the fluid pipeline is connected to the sample chamber via a branch pipeline, and a switchable sample port is provided on the branch pipeline, and the control module is connected to the fluid pipeline and the pressure pipeline respectively, and is used to control the opening and closing of the branch pipeline. The present invention enables the formation tester sampling device to meet the requirements of inverted hanging operations, and can also improve the problem of the small capacity of the sampling barrel, so as to meet the requirements of large-capacity conventional sampling on site.

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 a hot topic and a key focus of the current global marine economic development. Marine oil and gas resources are not only vast in reserves, but modern science and technology have already enabled their enormous development potential. The offshore oil and gas industry has become a leading, emerging sector in the marine economy with high output value. Currently, with the widespread application of EFDT formation testers, the demand for inverted instrument string configurations is becoming increasingly urgent.

[0003] However, the sampling devices in the related art lack fluid and electrical buses, requiring them to be connected to the bottom of the instrument cluster. This fails to meet the requirements for inverted mounting of bottom-level test instruments, limiting instrument configuration and functionality. Furthermore, the sampling devices in the related art have limited capacity, making them incapable of meeting the needs of routine large-volume sampling on-site, and thus require improvement. Summary of the Invention

[0004] In order to solve all or part of the above 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 connector module, a control module, a sampling cylinder module, an adapter module, a lower connector module, and an electrical fluid bus, wherein the upper connector module, the control module, the sampling cylinder module, the adapter module, and the lower connector module are connected in sequence, and the electrical fluid bus passes through the upper connector module, the control module, the sampling cylinder module, the adapter module, and the lower connector 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 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 connected to the fluid pipeline and the pressure pipeline respectively, 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 pass through the wire passing tube respectively.

[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 line and / or a fourth sample line, the third sample line connects the fluid line and the third sample chamber, and / or the fourth sample line connects the fluid line and the third mud chamber;

[0016] The sample transfer port includes a first sample transfer port provided on the third sample line, and / or a second sample transfer port provided 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 pipeline and the first mechanical valve, and a third solenoid valve connecting the pressure pipeline 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] As can be seen from the above technical solution, 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 and 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 instrument string configuration 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, making it easy to take 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 that 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 to 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 structural diagram of a formation tester sampling device in Example 1 of the present invention;

[0027] Figure 3 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 This is a schematic structural diagram of a formation tester sampling device in Example 2 of the present invention;

[0030] Figure 6 This is a 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 solutions and advantages of the present invention more clearly understood, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that, in the absence of conflict, the embodiments of the present invention and the features therein can be combined with each other in any manner.

[0032] Example 1

[0033] like Figure 1 、 Figure 2 、 Figure 3 The figure shows embodiment 1 of the present invention, which discloses a formation tester sampling device, 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 be able 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 the branch pipeline is provided with a switchable sample port (Z1, Z2). 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 opening and closing of the branch pipeline.

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

[0037] When the instrument string reaches the operating point and meets the sampling conditions, the control device 2 connects the fluid line 61 to the sample chamber 31, controls the sample transfer ports (Z1, Z2) to close, and the mud ports (Q1, Q2) to open. At this time, the sample liquid in the fluid line 61 enters the sample chamber 31. Under the action of the pumping pressure, the sample liquid continuously fills 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 line 61 to be disconnected from the sample chamber 31, so that the sample liquid is sealed in the sample chamber 31, thereby completing the sampling operation.

[0038] When the instrument serial sampling operation is completed and reaches the surface, the sample transfer ports (Z1, Z2) are connected to the sample transfer device and opened. At the same time, the mud ports (Q1, Q2) are connected to a high-pressure gas source. High-pressure gas is blown through the mud ports (Q1, Q2) to expand the mud chamber 32. At this time, the sample in the sample chamber 31 enters the sample storage bottle through the sample transfer ports (Z1, Z2), thus 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 side wall of the piston 34 is tightly abutted against the outer side wall of the wire passing tube 35, and the outer side wall of the piston 34 is tightly abutted against the inner side 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 richer and 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 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 that can be turned 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, while the mud chamber 32 includes a first mud chamber U2 and a second mud chamber D1. Specifically, the upper piston 341 divides the interior of the upper cylinder 331 into the first sample chamber U1 and the first mud chamber U2, while the lower piston 342 divides the lower cylinder 333 into the second sample chamber D2 and the second mud chamber D1. Furthermore, the first mud chamber U2 and the second mud chamber D1 are located near the intermediate joint 332 and are connected to the second mud port Q1.

[0045] Reference Figure 1 、 Figure 2 The branch line includes a first sample line 611 and a second sample line 612. The first sample line 611 connects the fluid line 61 to the first sample chamber U1, and the second sample line 612 connects the fluid line 61 to the second sample chamber D2. The sample transfer port includes a first sample transfer port Z1 provided on the first sample line 611 and a second sample transfer port Z2 provided on the second sample line 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-cylinder sampling (two sampling cylinders sample the sample liquid separately)

[0049] Before the formation tester sampling device is lowered into the wellbore, the first sample transfer port Z1 is closed, the first manual valve F1 is open, the second mud port Q1 is open, and the first mud port Q2 is closed. Once the formation tester sampling device is connected to the instrument and inserted into the wellbore, wellbore fluid enters the first mud chamber U2 and second mud chamber D1 of the sampling barrel 33 through the second mud port Q1 on the intermediate connector 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 opens, and the high-pressure hydraulic oil in the pressure line 62 opens the first mechanical valve V1. At this point, the sample liquid in the fluid line 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 pumping pressure, the sample liquid continuously fills the first sample chamber U1, and the upper piston 341 moves rightward along the line pipe 35, allowing the wellbore fluid in the first mud chamber U2 to be 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 closes, and the second solenoid valve S2 opens. This closes the first mechanical valve V1, sealing the sample in the first sample chamber U1, thus completing the sampling operation of the upper cylinder 331.

[0051] Before the instrument string reaches another operating point and goes downhole, 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 line 62 opens the second mechanical valve V2. At this time, the sample liquid in the fluid line 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 line 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, thereby closing the second mechanical valve V2 to seal the sample liquid in the second sample chamber D2, thereby completing the sampling operation of the lower cylinder 333.

[0052] After the instrument serial sampling operation is completed and the instrument reaches the surface, 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, driving the upper piston 341 to the left along the wire tube 35. 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, thus completing the sample transfer operation in 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, driving the lower piston 342 to the right along the wire tube 35. 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, thus completing the sample transfer operation in 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 wellbore, the first sample transfer port Z1 is closed, the first manual valve F1 is open, the second mud port Q1 is open, and the first mud port Q2 is open. Once the formation tester sampling device is connected to the instrument and lowered into the wellbore, wellbore fluid flows from the second mud port Q1 and the first mud port Q2 into the first mud chamber U2, the second mud chamber D1, and the second sample chamber D2. 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 positioned in the middle of the lower cylinder 333, achieving dynamic equilibrium.

[0055] When the sampling conditions are met, the first solenoid valve S1 opens, and the high-pressure hydraulic oil in the pressure line 62 opens the first mechanical valve V1. At this point, the sample liquid in the fluid line 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 pumping pressure, the sample liquid continuously fills the first sample chamber U1, and the upper piston 341 moves rightward along the line pipe 35, allowing the wellbore fluid in the first mud chamber U2 to be 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 closes, and the second solenoid valve S2 opens. This closes the first mechanical valve V1, sealing the sample in the first sample chamber U1, thus completing the sampling operation of the upper cylinder 331.

[0056] When the instrument serial sampling operation is completed and reaches the surface, 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, driving the upper piston 341 to move leftward along the wire tube 35. 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, thus completing the sample transfer operation of the upper cylinder 331.

[0057] The formation tester sampling device in this embodiment 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 two different points, and can also sample sample liquids at two different layers at the same time, making sampling operations 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 two samples at the same location, or take samples at 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 second embodiment of the present invention is shown. This embodiment differs from the first embodiment in that the sampling cylinder 33 is configured as an elongated cylinder 334, and the elongated cylinder 334 is at least the sum of the lengths of the two sampling cylinders in the first embodiment. The piston 34 includes an intermediate piston 343. The sample chamber 31 includes a third sample chamber A1, and the mud chamber 32 includes a third mud chamber A2. The intermediate piston 343 divides the elongated 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 line 613 and / or a fourth sample line 614. The third sample line 613 connects the fluid line 61 with the third sample chamber A1, and / or the fourth sample line 614 connects the fluid line 61 with the third mud chamber A2. The sample transfer port includes a first sample transfer port Z1 provided in the third sample line 613 and / or a second sample transfer port Z2 provided in the fourth sample line 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 closed, the first manual valve F1 is open, the second manual valve F2 is closed, and the first mud port Q2 is open. After the formation tester sampling device is connected to the instrument string and lowered into the well, as the depth increases, wellbore fluid enters the third mud chamber A2 from the first mud port Q2. Under the influence 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 operating point and the reciprocating pump discharges samples to meet the sampling conditions, the first solenoid valve S1 opens, and the high-pressure hydraulic oil in the pressure line 62 opens the first mechanical valve V1. At this time, the sample liquid in the fluid line 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 pumping pressure, the sample liquid continuously fills the third sample chamber A1, and the intermediate piston 343 moves rightward along the line pipe 35, causing the wellbore fluid in the third mud chamber A2 to be discharged from the first mud port Q2. When the third sample chamber A1 is full of sample, the first solenoid valve S1 is closed and the second solenoid valve S2 is opened. This closes the first mechanical valve V1, sealing the sample in the third sample chamber A1, thus completing the sampling operation of the third sample chamber A1.

[0066] When the instrument string 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, then open the first manual valve F1, blow high-pressure gas from the first mud port Q2, drive the intermediate piston 343 to move to the 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 cylinder module 3.

[0067] In other embodiments, a fourth sample line 614 and a second mechanical valve V2 and a second manual valve F2 are provided thereon. 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 needs to replace the cylinder to obtain a fluid sample with a larger sampling volume, thereby realizing the replacement of two sampling volume modes and meeting the large-capacity and multi-requirement sampling needs of the instrument.

[0069] It should be noted that, unless otherwise specified, the technical 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 the technical features indicated. In the description of the present invention, "plurality" means more than two, unless otherwise 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 make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions 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 description of the present invention. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments 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: The device comprises an upper connector module, a control module, a sampling cylinder module, an adapter module, a lower connector module and an electrical fluid bus, wherein the upper connector module, the control module, the sampling cylinder module, the adapter module and the lower connector module are connected in sequence, and the electrical fluid bus passes through the upper connector module, the control module, the sampling cylinder module, the adapter module and the lower connector 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 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 switchable sample port. The control module is connected to the fluid pipeline and the pressure pipeline respectively, and is used to control the opening and closing of the branch pipeline. The sampling cylinder module includes a sampling cylinder, a piston and a wire tube, wherein the wire tube is coaxially arranged in the sampling cylinder, the piston is sealed and slidably connected between the wire tube and the sampling cylinder, the piston divides the interior of the sampling cylinder 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 tube; 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 opened and closed; 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.

2. The formation tester sampling device according to claim 1, characterized in that: 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 provided on the first sample line and a second sample transfer port provided on the second sample line.

3. The formation tester sampling device according to claim 2, 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.

4. The formation tester sampling device according to claim 3, characterized in that: The control module further includes a second solenoid valve connecting the first solenoid valve and the third solenoid valve.

5. The formation tester sampling device according to claim 1, characterized in that: The sampling cylinder is configured as a long cylinder, the piston includes a middle piston, the sample cavity includes a third sample cavity, the mud cavity includes a third mud cavity, and the third sample cavity and the third mud cavity are separated in the sampling cylinder by the middle piston.

6. The formation tester sampling device according to claim 5, 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 and the third sample chamber, and / or the fourth sample pipeline connects the fluid pipeline and the third mud chamber; The sample transfer port includes a first sample transfer port provided on the third sample line, and / or a second sample transfer port provided on the fourth sample line.

7. The formation tester sampling device according to claim 6, characterized in that: The control module includes a first mechanical valve and a first manual valve arranged on the third sample line, a second mechanical valve and a second manual valve arranged on the fourth sample line, 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.

8. The formation tester sampling device according to claim 7, 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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