Fluid control nipple of underground stratum sampling device

Abstract

The invention discloses a fluid control short section of an underground stratum sampling device. The technical problem that slurry and other liquids which do not need to be sampled enter a sampling short section is solved. The fluid control pup joint comprises a pup joint body, a hydraulic pipeline, an oil return pipeline and a fluid pipeline are arranged in the pup joint body in a penetrating mode, a hydraulic control valve set is arranged on the pup joint body, and the hydraulic control valve set is used for controlling connection and disconnection of the fluid pipeline so that stratum liquid can enter a sampling pup joint of the stratum sampling device through the fluid pipeline. Or the water is discharged into the stratum through a discharging short section of the stratum sampling device. The on-off control of the fluid pipeline can be realized, after the fluid pipeline is closed, slurry and other liquids which do not need to be sampled can be directly discharged into the stratum through the discharging short section of the stratum sampling device, and a worker does not need to perform screening and other operations on a liquid sample in the sampling short section, so that the burden of the worker can be reduced, and the sampling efficiency is improved. And the operation time efficiency can be improved.

Description

Technical Field

[0001] The invention belongs to the technical field of control systems, and in particular relates to a fluid control nipple of a downhole formation sampling device. Background Art

[0002] The development of marine oil and gas resources is the hotspot and focus of the current world marine economic development. Marine oil and gas resources are not only large in reserves, but modern science and technology have great capabilities for their development. The marine oil and gas industry has developed into a new and high-value-added leading industry in the marine economy. The significance of underground formation sampling is to obtain underground rock and liquid samples. By analyzing these samples, important data support is provided for geological exploration, which is helpful to predict the distribution of mineral resources and assess the risk of geological disasters.

[0003] When the formation sampling device in the related technology samples liquid samples, mud and other liquids that do not need to be sampled will also enter the sampling pup joint through the fluid pipeline. Subsequently, the liquid samples in the sampling pup joint will need to be screened and other operations will increase the burden on the staff and affect the operation timeliness, which needs to be improved. 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 fluid control short section of a downhole formation sampling device, which can realize the on-off control of the fluid pipeline, so that mud and other liquids that do not need to be sampled can be directly discharged into the formation. The staff does not need to screen the liquid samples in the sampling short section, which can not only reduce the burden on the staff, but also improve the time efficiency of the operation.

[0005] The present invention provides a fluid control nipple of a downhole formation sampling device, comprising: The short section body has two ends respectively used to connect with the corresponding short sections of the formation sampling device; A hydraulic pipeline is passed through the main body of the short section; An oil return pipeline is arranged inside the main body of the short section; A fluid pipeline is passed through the main body of the short section; A hydraulically controlled valve group is arranged on the main body of the short section; The hydraulic control valve group is used to control the on-off of the fluid pipeline so that the formation liquid enters the sampling nipple of the formation sampling device through the fluid pipeline, or is discharged into the formation through the discharge nipple of the formation sampling device.

[0006] Optionally, the hydraulically controlled valve group includes: A fluid hydraulic control valve connected to the fluid pipeline; A hydraulic control line, one end of which is connected to the hydraulic line and the other end of which is connected to the hydraulic end of the fluid hydraulic control valve; An electromagnetic control valve, a hydraulic end of which is connected to the hydraulic control pipeline, and an oil return end of which is connected to the oil return pipeline; Among them, the electromagnetic control valve is used to control the on-off of the hydraulic control pipeline, so that the valve core in the fluid hydraulic control valve can move under the joint action of its internal return spring and hydraulic oil, thereby realizing the on-off control of the fluid pipeline.

[0007] Optionally, the hydraulic control valve group further includes: A one-way valve is connected to the hydraulic control line. The one-way valve is located between the fluid hydraulic control valve and the electromagnetic control valve, and is used to limit the hydraulic oil to flow only from the electromagnetic control valve toward the fluid hydraulic control valve.

[0008] Optionally, the hydraulic control valve group further includes: The pressure relief solenoid valve is arranged between the one-way valve and the fluid hydraulic control valve, and the fluid inlet end of the pressure relief solenoid valve is connected to the hydraulic control pipeline, and the oil return end of the pressure relief solenoid valve is connected to the oil return pipeline.

[0009] Optionally, the hydraulic control valve group further includes: The overflow valve is arranged between the one-way valve and the pressure relief solenoid valve, and the liquid inlet end of the overflow valve is connected to the hydraulic control pipeline, and the oil return end of the overflow valve is connected to the oil return pipeline.

[0010] Optionally, the fluid control sub also includes: The pressure regulating valve group is connected to the hydraulic pipeline and is used to adjust the pressure of the hydraulic oil in the hydraulic pipeline.

[0011] Optionally, the pressure regulating valve group includes multiple pressure regulating pipelines connected in parallel to the hydraulic pipeline, each of the pressure regulating pipelines is respectively connected to a pressure regulating solenoid valve and a pressure regulating valve, and the pressure regulation values ​​of the multiple pressure regulating valves increase or decrease sequentially.

[0012] Optionally, the fluid control sub also includes: A wire storage bin is arranged on the main body of the short section for allowing pipelines to pass through or be stored.

[0013] Optionally, connecting parts are respectively provided at both ends of the pup joint body for connecting the pup joint body with a corresponding pup joint of a formation sampling device.

[0014] Optionally, electrical connection plugs are respectively provided in the two connection parts for electrically connecting the short section body to the corresponding short section of the formation sampling device.

[0015] It can be seen from the above technical solution that the fluid control nipple of the downhole formation sampling device provided by the present invention has the following advantages: The fluid control nipple can realize the on-off control of the fluid pipeline. When the fluid pipeline is closed, mud and other liquids that do not need to be sampled can be directly discharged into the formation through the discharge nipple of the formation sampling device. The staff does not need to screen the liquid samples in the sampling nipple, etc., which can not only reduce the burden on the staff, but also improve the operation efficiency.

[0016] Other features and advantages of the present invention will be set forth in the description which follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] 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.

[0018] Figure 1 It is a schematic diagram of the overall structure of the fluid control nipple in an embodiment of the present invention; Figure 2 It is a schematic diagram of the structure of the pipeline in the fluid control nipple in an embodiment of the present invention.

[0019] Description of reference numerals: 1. Pup joint body; 2. Connecting part; 3. Hydraulic pipeline; 4. Oil return pipeline; 5. Fluid pipeline; 6. Hydraulic control valve group; 61. Fluid hydraulic control valve; 62. Hydraulic control pipeline; 63. Solenoid control valve; 64. Check valve; 65. Pressure relief solenoid valve; 66. Overflow valve; 7. Pressure regulating valve group; 71. Pressure regulating pipeline; 72. Pressure regulating solenoid valve; 73. Pressure regulating valve; 8. Line storage bin. DETAILED DESCRIPTION

[0020] 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.

[0021] like Figure 1 , Figure 2 The figure shows an embodiment of the present invention, which discloses a fluid control nipple of a downhole formation sampling device, including a nipple body 1, and connecting parts 2 are respectively provided at both ends of the nipple body 1, one of the connecting parts 2 is used to connect with the sampling nipple of the formation sampling device, and the other connecting part 2 is used to connect with the discharge nipple of the formation sampling device. At the same time, electrical connection plugs (not shown in the figure) are respectively provided in the two connecting parts 2, so as to electrically connect the nipple body 1 with the corresponding nipple of the formation sampling device.

[0022] In one embodiment, Figure 1 , Figure 2As shown, a hydraulic pipeline 3, an oil return pipeline 4 and a fluid pipeline 5 are passed through the pup joint body 1, and both ends of the hydraulic pipeline 3, the oil return pipeline 4 and the fluid pipeline 5 are respectively connected to the pipeline plugs in the corresponding pup joints of the formation sampling device, and the discharge pipe in the discharge pup joint is connected to the fluid pipeline 5.

[0023] In one embodiment, Figure 1 , Figure 2 As shown, a hydraulic control valve group 6 is provided on the main body 1 of the sub. When the formation liquid is a sample liquid, the fluid pipeline 5 is controlled to be opened by the hydraulic control valve group 6, and the discharge pipe of the discharge sub is ensured to be in a closed state. At this time, the sample liquid can enter the sampling sub of the formation sampling device through the fluid pipeline 5. When the formation liquid is a non-sample liquid such as mud, the fluid pipeline 5 is controlled to be closed by the hydraulic control valve group 6, and the discharge pipe in the discharge sub is opened. At this time, the non-sample liquid such as mud can enter the discharge sub through the fluid pipeline 5, and be discharged into the formation through the discharge channel in the discharge sub.

[0024] In this embodiment, the formation liquid is judged to be a sample liquid or a non-sample liquid by means of a density sensor and a viscosity sensor on the formation sampling device, that is, the density sensor and the viscosity sensor are located at the liquid inlet end of the fluid pipeline. Since the density and viscosity of the sample liquid (oil, gas and water) are different from those of the non-sample liquid (mud), when the formation liquid flows through the density sensor and the viscosity sensor, the density sensor and the viscosity sensor can judge whether the formation liquid is a sample liquid, thereby achieving the effect of formation liquid identification.

[0025] The fluid control pup joint of the downhole formation sampling device in this embodiment controls the on-off of the fluid pipeline 5 so that liquids such as mud that do not need to be sampled can be directly discharged into the formation through the discharge pup joint of the formation sampling device. The staff does not need to screen the liquid samples in the sampling pup joint, which can not only reduce the burden on the staff but also improve the working efficiency.

[0026] In this embodiment, if the formation testing device does not have a discharge nipple, a discharge pipe can be added to the nipple body 1, and a control valve can be added to the discharge pipe, while ensuring that the hydraulic control valve group 6 is located between the sampling nipple and the discharge pipe, so that non-sampling liquids such as mud can be discharged through the discharge pipe.

[0027] In one embodiment, Figure 1 , Figure 2 As shown, the hydraulic control valve group 6 includes a fluid hydraulic control valve 61, a hydraulic control pipeline 62 and an electromagnetic control valve 63. The fluid hydraulic control valve 61 is connected to the fluid pipeline 5, one end of the hydraulic control pipeline 62 is connected to the hydraulic pipeline 3, and the other end is connected to the hydraulic end of the fluid hydraulic control valve 61, the hydraulic end of the electromagnetic control valve 63 is connected to the hydraulic control pipeline 62, and the return oil end is connected to the return oil pipeline 4.

[0028] In one embodiment, Figure 1 , Figure 2 As shown, the hydraulic control valve group 6 also includes a one-way valve 64, a pressure relief solenoid valve 65 and a relief valve 66 which are arranged in sequence, the one-way valve 64 is close to the electromagnetic control valve 63, and the relief valve 66 is close to the fluid hydraulic control valve 61. The one-way valve 64 is connected to the hydraulic control pipeline 62, and is used to limit the hydraulic oil to flow only from the electromagnetic control valve 63 to the fluid hydraulic control valve 61, and the liquid inlet ends of the pressure relief solenoid valve 65 and the relief valve 66 are respectively connected to the hydraulic control pipeline 62, and the oil return ends are respectively connected to the oil return pipeline 4.

[0029] When the electromagnetic control valve 63 is opened, the hydraulic control line 62 is connected, and the hydraulic oil in the hydraulic line 3 enters the fluid hydraulic control valve 61 and pushes the valve core in the fluid hydraulic control valve 61 to move, so that the fluid pipeline 5 is connected. At this time, under the pressure stabilizing effect of the one-way valve 64, the pressure of the hydraulic oil in the fluid hydraulic control valve 61 is guaranteed to be stable, so that the fluid pipeline 5 remains in a stable conductive state.

[0030] When the electromagnetic control valve 63 is closed and the pressure relief electromagnetic valve 65 is opened, the hydraulic control line 62 is connected to the oil return line 4, and the hydraulic oil in the hydraulic line 3 flows through the electromagnetic control valve 63 and flows back to the oil return line 4. At the same time, the return spring in the fluid hydraulic control valve 61 pushes the valve core to reset, and the hydraulic oil in the fluid hydraulic control valve 61 enters the pressure relief electromagnetic valve 65 and flows back to the oil return line 4, so that the fluid pipeline 5 is disconnected.

[0031] The hydraulic control valve group 6 uses the pressure of hydraulic oil to realize the on-off control of the fluid pipeline 5, which is more convenient and quick to operate, and the control effect is more stable. At the same time, the one-way valve 64 has a pressure stabilizing effect to ensure that the fluid pipeline 5 maintains a stable conduction state, and the overflow valve 66 can realize the protection of the hydraulic control pipeline 62, that is, when the pressure of the hydraulic oil in the hydraulic control pipeline 62 is too high, the hydraulic oil can automatically flow back to the return oil pipeline 4 through the overflow valve 66.

[0032] Moreover, the pressure relief solenoid valve 65 in the hydraulic control valve group 6 has two functions. One is to realize the pressure relief of the hydraulic oil in the fluid hydraulic control valve 61, and the other is to realize the pressure relief of the hydraulic oil in the hydraulic control pipeline. That is, when the fluid control nipple is inspected and maintained, the pressure relief solenoid valve 65 can be controlled to be open for a period of time to completely discharge the hydraulic oil in the hydraulic control pipeline 62 to ensure the safety of the staff.

[0033] In one embodiment, Figure 1 , Figure 2 As shown, the fluid control nipple also includes a pressure regulating valve group 7 connected to the hydraulic pipeline 3, and the pressure regulating valve group 7 is used to adjust the pressure of the hydraulic oil in the hydraulic pipeline 3 so that the sampling drill bit of the formation sampling device can adapt to different formations.

[0034] In one embodiment, Figure 1 , Figure 2 As shown, the pressure regulating valve group 7 includes multiple pressure regulating pipelines 71 connected in parallel to the hydraulic pipeline 3, each pressure regulating pipeline 71 is connected to a pressure regulating solenoid valve 72 and a pressure regulating valve 73, and the pressure regulating values ​​of the multiple pressure regulating valves 73 increase or decrease in sequence.

[0035] The pressure regulating valve 73 in this embodiment is a rated pressure regulating valve, and three pressure regulating valves 73 are provided on the pressure regulating pipeline 71. The pressure regulating values ​​of the three pressure regulating valves 73 are 200psi, 300psi, and 800psi, respectively. When the required pressure of the hydraulic oil is 300psi, the pressure regulating solenoid valve 72 on the corresponding pressure regulating pipeline 71 is opened, and the other two pressure regulating solenoid valves 72 are closed. At this time, the pressure of the pressure oil in the hydraulic pipeline 3 can be guaranteed to be 300psi.

[0036] The pressure regulation principle in this embodiment is as follows: since the pressure regulating pipeline 71 is connected to the hydraulic pipeline 3, the pressure regulating pipeline 71 and the hydraulic pipeline 3 constitute an isobaric pipeline. When the hydraulic oil flows through the pressure regulating valve 73, the pressure is overflowed and the pressure is relieved under the action of the spring pressure regulation in the pressure regulating valve 73, that is, the oil pressure in the pressure regulating pipeline 71 changes, and the pressure regulating pipeline 71 and the hydraulic pipeline 3 constitute an isobaric pipeline. Therefore, the oil pressure of the hydraulic pipeline 3 also changes accordingly (the same as the oil pressure of the pressure regulating pipeline 71), thereby realizing the pressure regulation of the hydraulic pipeline 3.

[0037] In one embodiment, Figure 1 , Figure 2 As shown, the fluid control nipple also includes a wire storage bin 8 disposed on the nipple body 1, and the wire storage bin 8 is for the pipeline to pass through or store, so that the pipeline can turn in the wire storage bin 8, thereby facilitating the staff to arrange the pipeline and improving the compactness of the design.

[0038] As can be seen from the above, the use of the fluid control nipple allows liquids such as mud that do not need to be sampled to be directly discharged into the formation, that is, liquids such as mud will not enter the sampling nipple. Therefore, the staff does not need to perform operations such as screening the liquid samples in the sampling nipple, which can not only reduce the burden on the staff, but also improve the time efficiency of the operation. In addition, integrating the hydraulic control part into a nipple shortens the overall length of the formation sampling device, which is more conducive to the compact design of the formation sampling device.

[0039] 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.

[0040] 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.

[0041] 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 fluid control nipple of a downhole formation sampling device, characterized in that: include: The two ends of the short section body (1) are respectively used to connect with the corresponding short sections of the formation sampling device; A hydraulic pipeline (3) is passed through the pup joint body (1); An oil return pipeline (4) is passed through the nipple body (1); A fluid pipeline (5) is passed through the short section body (1); A hydraulically controlled valve group (6) is arranged on the short joint body (1); The hydraulic control valve group (6) is used to control the on / off of the fluid pipeline (5) so that the formation liquid can enter the sampling nipple of the formation sampling device through the fluid pipeline (5), or be discharged into the formation through the discharge nipple of the formation sampling device; The hydraulic control valve group (6) comprises: A fluid hydraulic control valve (61) connected to the fluid pipeline (5); A hydraulic control line (62), one end of which is connected to the hydraulic line (3) and the other end of which is connected to the hydraulic end of the fluid hydraulic control valve (61); An electromagnetic control valve (63), the hydraulic end of which is connected to the hydraulic control pipeline (62) and the oil return end of which is connected to the oil return pipeline (4); The electromagnetic control valve (63) is used to control the on-off of the hydraulic control pipeline (62), so that the valve core in the fluid hydraulic control valve (61) can move under the combined action of its internal return spring and hydraulic oil, thereby realizing the on-off control of the fluid pipeline (5).

2. The fluid control nipple according to claim 1, characterized in that: The hydraulic control valve group (6) also includes: A one-way valve (64) is connected to the hydraulic control pipeline (62). The one-way valve (64) is located between the fluid hydraulic control valve (61) and the electromagnetic control valve (63). The one-way valve (64) is used to limit the flow of hydraulic oil from the electromagnetic control valve (63) to the fluid hydraulic control valve (61).

3. The fluid control nipple according to claim 2, characterized in that: The hydraulic control valve group (6) also includes: The pressure relief solenoid valve (65) is arranged between the one-way valve (64) and the fluid hydraulic control valve (61), and the liquid inlet end of the pressure relief solenoid valve (65) is connected to the hydraulic control pipeline (62), and the oil return end is connected to the oil return pipeline (4).

4. The fluid control nipple according to claim 3, characterized in that: The hydraulic control valve group (6) also includes: The overflow valve (66) is arranged between the one-way valve (64) and the pressure relief solenoid valve (65), and the liquid inlet end of the overflow valve (66) is connected to the hydraulic control pipeline (62), and the oil return end is connected to the oil return pipeline (4).

5. The fluid control nipple according to claim 1, characterized in that: The fluid control nipple also includes: The pressure regulating valve group (7) is connected to the hydraulic pipeline (3) and is used to regulate the pressure of the hydraulic oil in the hydraulic pipeline (3).

6. The fluid control nipple according to claim 5, characterized in that: The pressure regulating valve group (7) comprises a plurality of pressure regulating pipelines (71) connected in parallel to the hydraulic pipeline (3), each of the pressure regulating pipelines (71) being respectively connected to a pressure regulating solenoid valve (72) and a pressure regulating valve (73), and the pressure regulating values ​​of the plurality of pressure regulating valves (73) are increased or decreased in sequence.

7. The fluid control nipple according to claim 1, characterized in that: The fluid control nipple also includes: A wire storage bin (8) is arranged on the short section body (1) for allowing pipelines to pass through or be stored.

8. The fluid control nipple according to claim 1, characterized in that: Both ends of the pup joint body (1) are respectively provided with connecting parts (2) for connecting the pup joint body (1) with corresponding pup joints of a formation sampling device.

9. The fluid control nipple according to claim 8, characterized in that: Electrical connection plugs are respectively arranged in the two connecting parts (2) for electrically connecting the short section body (1) to the corresponding short section of the formation sampling device.

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