Method for using a formation fluid sampling device

Abstract

The application discloses a kind of formation fluid sampling device's use method, solve the technical problem that manual control valve cannot detect, sampling success rate is difficult to guarantee.The formation fluid sampling device includes sample cylinder body, energy storage mechanism, sampling connector, sampling channel, sampling interface and manual control valve, further includes: inspection port, is set on sampling connector, and with sampling channel communication;Inspection plug, is screw-connected in inspection port;Pressure relief port, is set on sampling connector, and with sampling channel communication;Pressure relief valve, is screw-connected in pressure relief port;First check valve, is set in sampling channel, and is located between sampling interface and pressure relief valve, manual control valve is between inspection port and pressure relief port.The application can realize the detection of manual control valve, also can prevent sample liquid from flowing out of sampling device, improve the use reliability of sampling device, guarantee sampling success rate.

Description

Technical Field

[0001] The invention belongs to the technical field of formation fluid sampling, and in particular relates to a method for using a formation fluid sampling device. Background Art

[0002] Today, marine oil and gas resources are not only vast in reserves, but modern science and technology have enabled their development. The marine oil and gas industry has become a new, high-value, and leading sector in the marine economy. Formation fluid sampling devices, also known as formation fluid sampling tubes or formation fluid samplers, are devices used to sample and store fluids within formations.

[0003] The formation fluid sampling device in the related technology usually includes a sample cylinder, an energy storage mechanism is provided in the sample cylinder, a sampling joint is provided at the end of the sample cylinder, a sampling channel connected to the sample cylinder is provided in the sampling joint, and a sampling interface is provided at the port of the sampling channel. At the same time, a manual control valve is provided on the sampling joint.

[0004] When sampling the fluid in the formation, the formation fluid sampling device is installed on the sampling instrument body, the sampling instrument is lowered to the target well depth, and the suction pump inside the instrument body is used to extract the formation fluid and inject it into the sampling cylinder. After the injection is completed, the sampling instrument is raised to the wellhead, the manual valve is closed, and the sampling device is disassembled to complete the sampling operation. When the sample liquid is transferred out, the manual control valve is slowly opened. At this time, the sample liquid is automatically discharged through the sampling channel under the action of the energy storage mechanism, thereby achieving rapid transfer of the sample liquid.

[0005] The formation fluid sampling device in the related art has the following disadvantages:

[0006] 1. Before the sampling device is lowered into the well, the open and closed status of the manual control valve can only be judged by visual inspection, and the quality of the manual control valve cannot be judged;

[0007] 2. After the filling operation is completed, if the filling stop valve fails and cannot be closed, the filled sample liquid will flow out of the sampling device, causing the sampling operation to fail.

[0008] It can be seen that improving the reliability of sampling devices and ensuring the success rate of sampling are of great significance to the exploration and development of oil and gas resources. Summary of the Invention

[0009] In order to solve all or part of the above problems, the purpose of the present invention is to provide a method for using a formation fluid sampling device, which can realize the detection of a manual control valve, prevent the sample liquid from flowing out of the sampling device, improve the reliability of the sampling device, and ensure the success rate of sampling.

[0010] The present invention provides a formation fluid sampling device, comprising a sampling cylinder, an energy storage mechanism, and a sampling joint, wherein a sampling channel is provided in the sampling joint, a sampling interface is provided at the end of the sampling channel, and a manual control valve is provided on the sampling joint. The formation fluid sampling device further comprises:

[0011] An inspection port is provided on the sampling connector and is connected to the sampling channel;

[0012] An inspection plug, threadedly connected to the inspection port;

[0013] A pressure relief port is provided on the sampling joint and is in communication with the sampling channel;

[0014] a pressure relief valve, threadedly connected to the pressure relief port;

[0015] Wherein, the manual control valve is located between the inspection port and the pressure relief port.

[0016] Optionally, a first one-way valve is provided in the sampling channel, the first one-way valve is located between the sampling interface and the pressure relief valve, and the first one-way valve can limit the sample liquid to enter the sampling channel only from the formation.

[0017] Optionally, a mounting hole is provided at one end of the sampling connector close to the sampling interface, the mounting hole is communicated with the sampling channel, and the first one-way valve can be removed from the mounting hole, and a sealing plug is threadedly connected to the mounting hole.

[0018] Optionally, the sampling connector is threadedly connected to the sample cylinder, and an elastic sealing ring is provided between the sampling connector and the sample cylinder.

[0019] Optionally, the energy storage mechanism includes:

[0020] A nitrogen filling piston is slidably connected to the sample cylinder;

[0021] A separating piston is slidably connected to the sample cylinder body, and the separating piston is located between the sampling connector and the nitrogen filling piston;

[0022] a nitrogen charging channel, provided on the nitrogen charging piston;

[0023] A nitrogen charging interface is provided at a port of the nitrogen charging channel away from the separating piston and is used for connecting to an external nitrogen charging pipeline;

[0024] a second one-way valve, disposed in the nitrogen charging channel and capable of limiting nitrogen gas from passing through the nitrogen charging channel and entering between the nitrogen charging piston and the separating piston;

[0025] A balancing plug is provided at one end of the sample cylinder away from the sampling connector;

[0026] A balancing channel is provided on the balancing plug, and an external nitrogen filling pipeline can pass through the balancing channel.

[0027] Optionally, a stirring ball is movably provided in the sample cylinder body, the stirring ball is located between the sampling connector and the separation piston, and the diameter of the stirring ball is smaller than the inner diameter of the sample cylinder body.

[0028] Optionally, a clearance groove is provided on each side of the separation piston and the sampling joint close to each other, and both sides of the stirring ball can enter the corresponding clearance groove respectively.

[0029] Optionally, the inner side walls of the two give way grooves are hemispherical, and the inner diameter of the give way groove is not less than the diameter of the stirring ball, so that the separating piston can abut against the sampling connector, and the stirring ball can be located in the spherical cavity formed by the two give way grooves.

[0030] Optionally, the balancing plug is threadedly connected to the sample cylinder, and an elastic sealing ring is provided between the balancing plug and the sample cylinder.

[0031] Optionally, a sealing O-ring is provided on each of the separating piston and the nitrogen-filling piston, and the sealing O-ring is in tight contact with the inner wall of the sample cylinder to achieve sealing.

[0032] As can be seen from the above technical solutions, the formation fluid sampling device provided by the present invention has the following advantages:

[0033] This formation fluid sampling device can detect the manual control valve and prevent the sample liquid from flowing out of the sampling device, thereby improving the reliability of the sampling device and ensuring the sampling success rate. At the same time, the formation fluid sampling device can also ensure the smooth transfer of sample liquid, reduce the risk of sample liquid splashing, and improve the safety of the formation fluid sampling device.

[0034] Other features and advantages of the present invention will be set forth in the description that follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] 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.

[0036] Figure 1 is a cross-sectional view of a formation fluid sampling device according to an embodiment of the present invention;

[0037] Figure 2 is a cross-sectional view of a sampling connector according to an embodiment of the present invention;

[0038] Figure 3 2 is a cross-sectional view of a nitrogen-filling piston in an embodiment of the present invention.

[0039] Description of reference numerals:

[0040] 1. Sample cylinder; 2. Energy storage mechanism; 201. Nitrogen charging piston; 202. Separating piston; 203. Nitrogen charging channel; 204. Nitrogen charging interface; 205. Second one-way valve; 3. Sampling connector; 4. Sampling channel; 5. Sampling interface; 6. Manual control valve; 7. Inspection port; 8. Inspection plug; 9. Pressure relief port; 10. Pressure relief valve; 11. First one-way valve; 12. Mounting hole; 13. Sealing plug; 14. Sealing ring; 15. O-ring; 16. Balancing plug; 17. Balancing channel; 18. Stirring ball; 19. Give way groove; 20. Sealing ring; 21. Sealing O-ring; 22. Process flow channel hole; 23. Process plug. DETAILED DESCRIPTION

[0041] 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.

[0042] like Figure 1 、 Figure 2 、 Figure 3 The present invention is shown in an embodiment, which discloses a method for using a formation fluid sampling device. The formation fluid sampling device includes a cylindrical sampling barrel 1, an energy storage mechanism 2 disposed within the sampling barrel 1, and a sampling connector 3 disposed at the end of the sampling barrel 1. The sampling connector 3 is provided with a sampling channel 4 that communicates with the sampling barrel 1, and a sampling interface 5 is provided at the end of the sampling channel 4. The sampling interface 5 is used to connect to an external sampling device. At the same time, a manual control valve 6 is provided on the sampling connector 3 to control the opening and closing of the sampling channel 4.

[0043] In one embodiment, Figure 1 、 Figure 2 As shown, the sampling connector 3 is provided with an inspection port 7 and a pressure relief port 9, which are respectively connected to the sampling channel 4, and the manual control valve 6 is located between the inspection port 7 and the pressure relief port 9. At the same time, the inspection port 7 is internally threadedly connected to an inspection plug 8, and the pressure relief port 9 is internally threadedly connected to a pressure relief valve 10.

[0044] Before the formation fluid sampling device is lowered into the well, the status of the manual control valve 6 can be judged by visual inspection, and then the manual control valve 6 is closed, and the pressure relief valve 10 is controlled to open at the same time. The inspection plug 8 is removed and gas is blown into the inspection port 7. If gas is discharged from the pressure relief valve 10, it proves that there is a problem with the manual control valve 6. If no gas is discharged from the pressure relief valve 10, it proves that the manual control valve 6 is in good condition.

[0045] The formation fluid sampling device of this embodiment can detect the condition of the manual control valve 6, ensuring that the sampling device is in good condition before being lowered into the well, improving the reliability of the sampling device and ensuring the success rate of sampling. Furthermore, by providing a pressure relief valve 10, when the sampling device is removed from the external sampling equipment, the high-pressure sample liquid in the sampling channel 4 can be discharged through the pressure relief valve 10, reducing the risk of sample liquid splashing and ensuring operational safety.

[0046] In this embodiment, the sampling channel 4 adopts a large diameter flow channel, that is, the inner diameter of the sampling channel 4 is made as large as possible to increase the displacement. When the sample liquid is heavy oil, it can ensure that the heavy oil is smoothly transferred out.

[0047] In one embodiment, Figure 1 、 Figure 2 As shown, a first one-way valve 11 is provided in the sampling channel 4. The first one-way valve 11 is located between the sampling interface 5 and the pressure relief valve 10. The first one-way valve 11 can limit the sample liquid to enter the sampling channel 4 only from the formation, so as to prevent the loss of the sample liquid and ensure the success rate of sampling.

[0048] In one embodiment, Figure 1 、 Figure 2 As shown, a mounting hole 12 is provided at one end of the sampling connector 3 near the sampling interface 5. The mounting hole 12 is connected to the sampling channel 4. The first one-way valve 11 is threadedly connected to the sampling channel 4. The first one-way valve 11 can be removed from the mounting hole 12 to enable replacement of the first one-way valve 11. At the same time, a sealing plug 13 is threadedly connected to the inner thread of the mounting hole 12 to achieve blocking of the end of the mounting hole 12.

[0049] In this embodiment, if Figure 2 As shown, the sampling channel 4 is divided into two sections, and the two sections of the sampling channel 4 are connected by a sample liquid flow channel. The sampling interface 5 is provided at the end of the first section of the sampling channel 4. The mounting hole 12 and the pressure relief port 9 are respectively connected to the first section of the sampling channel 4. The manual control valve 6 is provided on the second section of the sampling channel 4, and the inspection port is connected to the second section of the sampling channel 4. At the same time, the sampling connector 3 is provided with a process flow channel hole 22 connected to the first section of the sampling channel 4, and a process plug 23 is connected to the internal thread of the process flow channel hole 22.

[0050] In one embodiment, Figure 1 、 Figure 2As shown, the sampling connector 3 is inserted into the sample barrel 1 and is threadedly connected to the sample barrel 1. At the same time, an elastic sealing ring 14 is provided between the sampling connector 3 and the sample barrel 1 to achieve a good sealing effect.

[0051] In this embodiment, the outer wall of the sampling connector 3 is provided with two annular grooves, each of which is provided with a sealing ring 14, and the sealing ring 14 can be tightly abutted against the inner wall of the sample cylinder 1. The sealing ring 14 in this embodiment is made of rubber, silicone or latex material. In other embodiments, the sealing ring 14 can also be made of other elastic materials.

[0052] In this embodiment, O-rings 15 can also be additionally provided between the sealing plug 13 and the mounting hole 12, between the first one-way valve 11 and the sampling channel, between the pressure relief valve 10 and the pressure relief port 9, between the manual control valve 6 and the sampling connector 3, and between the inspection plug 8 and the inspection port 7 to ensure the sealing effect.

[0053] In one embodiment, Figure 1 、 Figure 3 As shown, the energy storage mechanism 2 includes a nitrogen-charging piston 201 and a separating piston 202 that are slidably connected to the sample cylinder 1, with the separating piston 202 located between the sampling connector 3 and the nitrogen-charging piston 201. A nitrogen-charging channel 203 is provided through the nitrogen-charging piston 201. A nitrogen-charging interface 204 is provided at the end of the nitrogen-charging channel 203 away from the separating piston 202, and the nitrogen-charging interface 204 is used to connect to an external nitrogen-charging pipeline.

[0054] In one embodiment, Figure 1 、 Figure 3 As shown, a second one-way valve 205 is fixedly connected to the nitrogen filling channel 203. The second one-way valve 205 can restrict nitrogen gas from passing through the nitrogen filling channel 203 and entering between the nitrogen filling piston 201 and the separating piston 202. At the same time, a balancing plug 16 is provided at the end of the sample cylinder 1 away from the sampling connector 3. The balancing plug 16 is penetrated by a balancing channel 17, and the external nitrogen filling pipeline can pass through the balancing channel 17.

[0055] The external nitrogen-filling pipe is passed through the balancing passage 17 and connected to the nitrogen-filling port 204. Subsequently, nitrogen is filled into the sample cylinder 1 through the nitrogen-filling device. At this point, the nitrogen-filling piston 201 and the separating piston 202 move away from each other until the space between the nitrogen-filling piston 201 and the separating piston 202 is filled with nitrogen. The external nitrogen-filling pipe can then be removed. In this embodiment, the balancing passage 17 connects the sample cylinder 1 to the external environment, thereby balancing the pressure within the well.

[0056] When the sample liquid is poured into the sample cylinder 1, the separating piston 202 moves toward the nitrogen filling piston 201 under the action of the sample liquid, compressing the nitrogen between the nitrogen filling piston 201 and the separating piston 202. When the sample liquid is transferred out, the separating piston 202 moves toward the side away from the nitrogen filling piston 201 under the action of the nitrogen pressure, and pushes the sample liquid out, so that the sample liquid can be transferred out smoothly.

[0057] In one embodiment, Figure 1 As shown, a stirring ball 18 is movably provided in the sample cylinder 1. The stirring ball 18 is located between the sampling connector 3 and the separation piston 202, and the diameter of the stirring ball 18 is smaller than the inner diameter of the sample cylinder 1, so as to achieve stirring of the sample liquid and reduce the risk of sample liquid precipitation.

[0058] In one embodiment, Figure 1 As shown, a clearance groove 19 is provided on the side where the separating piston 202 and the sampling connector 3 are close to each other, and the inner side walls of the two clearance grooves 19 are hemispherical, so that the separating piston 202 can abut against the sampling connector 3, and the stirring ball 18 can be located in the spherical cavity formed by the two clearance grooves 19.

[0059] Since the separating piston 202 can abut against the sampling connector 3, the distance between the separating piston 202 and the nitrogen filling piston 201 is increased as much as possible, so that more nitrogen can be filled between the separating piston 202 and the nitrogen filling piston 201, and greater pressure is provided for the sample liquid, so that the sample liquid can be transferred out smoothly.

[0060] In one embodiment, Figure 1 As shown, the balancing plug 16 is threadedly connected to the sample cylinder 1, and an elastic sealing ring 20 is provided between the balancing plug 16 and the sample cylinder 1 to improve the sealing effect between the balancing plug 16 and the sample cylinder 1.

[0061] In this embodiment, the outer wall of the balancing plug 16 is provided with two annular grooves, each of which is provided with a sealing ring 20, and the sealing ring 20 can be tightly abutted against the inner wall of the sample cylinder 1. The sealing ring 20 in this embodiment is made of rubber, silicone or latex material. In other embodiments, the sealing ring 20 can also be made of other elastic materials.

[0062] In one embodiment, Figure 1 、 Figure 3 As shown, the outer walls of the separating piston 202 and the nitrogen-filling piston 201 are respectively provided with annular grooves, and a sealing O-ring 21 is respectively snap-fitted in each annular groove, and the sealing O-ring 21 is tightly abutted against the inner wall of the sample cylinder body 1 to achieve sealing between the separating piston 202 and the nitrogen-filling piston 201 and the sample cylinder body 1.

[0063] As can be seen from the above, this formation fluid sampling device, while meeting the most basic sampling and storage functions, also incorporates additional features such as anti-blocking, anti-sample loss, and pressure relief and splash prevention. The anti-blocking function addresses issues such as clogging and time-consuming heavy oil sample transfer. The sample loss prevention function addresses sample fluid loss from the sampling device. The pressure relief and splash prevention function addresses the risk of high-pressure sample spray injuries when the sampling device is removed from an external sampling instrument. These multiple features can, to a certain extent, ensure the success rate of sampling operations, improve the efficiency of sampling and sample transfer operations, and ensure the personal safety of personnel.

[0064] 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.

[0065] 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.

[0066] 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 method for using a formation fluid sampling device, the formation fluid sampling device comprising a sampling barrel (1), an energy storage mechanism (2) and a sampling joint (3), wherein a sampling channel (4) is provided in the sampling joint (3), a sampling interface (5) is provided at the end of the sampling channel (4), and a manual control valve (6) is provided on the sampling joint (3), characterized in that: The formation fluid sampling device further comprises: An inspection port (7) is provided on the sampling connector (3) and is in communication with the sampling channel (4); An inspection plug (8) is threadedly connected to the inspection port (7); A pressure relief port (9) is provided on the sampling connector (3) and is in communication with the sampling channel (4); a pressure relief valve (10) threadedly connected to the pressure relief port (9); Wherein, the manual control valve (6) is located between the inspection port (7) and the pressure relief port (9); The method of use comprises the following steps: Before the formation fluid sampling device is lowered into the well, the state of the manual control valve (6) is determined by visual inspection, and then the manual control valve (6) is closed, while the pressure relief valve (10) is controlled to open; Remove the inspection plug (8) and blow gas into the inspection port (7). If gas is discharged from the pressure relief valve (10), it proves that there is a problem with the manual control valve (6). If no gas is discharged from the pressure relief valve (10), it proves that the manual control valve (6) is in good condition. When the formation fluid sampling device is disassembled from the external sampling equipment, the high-pressure sample liquid in the sampling channel (4) is discharged through the pressure relief valve (10), thereby reducing the risk of sample liquid splashing and ensuring operation safety.

2. The method for using the formation fluid sampling device according to claim 1, characterized in that: A first one-way valve (11) is provided in the sampling channel (4), and the first one-way valve (11) is located between the sampling interface (5) and the pressure relief valve (10). The first one-way valve (11) can limit the sample liquid to enter the sampling channel (4) only from the formation.

3. The method for using the formation fluid sampling device according to claim 2, characterized in that: A mounting hole (12) is provided at one end of the sampling connector (3) close to the sampling interface (5), the mounting hole (12) is communicated with the sampling channel (4), and the first one-way valve (11) can be removed from the mounting hole (12), and a sealing plug (13) is connected to the inner thread of the mounting hole (12).

4. The method for using the formation fluid sampling device according to claim 1, characterized in that: The sampling connector (3) is threadedly connected to the sample cylinder (1), and an elastic sealing ring (14) is provided between the sampling connector (3) and the sample cylinder (1).

5. The method for using the formation fluid sampling device according to claim 1, characterized in that: The energy storage mechanism (2) comprises: A nitrogen-filling piston (201) is slidably connected to the sample cylinder (1); A separating piston (202) is slidably connected to the sample cylinder (1), and the separating piston (202) is located between the sampling connector (3) and the nitrogen filling piston (201); A nitrogen charging channel (203) is provided on the nitrogen charging piston (201); A nitrogen charging interface (204) is provided at a port of the nitrogen charging channel (203) away from the separating piston (202) and is used for connecting to an external nitrogen charging pipeline; a second one-way valve (205) disposed in the nitrogen charging channel (203) and capable of limiting nitrogen gas from passing through the nitrogen charging channel (203) and entering between the nitrogen charging piston (201) and the separating piston (202); A balancing plug (16) is provided at one end of the sample cylinder (1) away from the sampling connector (3); A balancing channel (17) is provided on the balancing plug (16), and an external nitrogen filling pipeline can pass through the balancing channel (17).

6. The method for using the formation fluid sampling device according to claim 5, characterized in that: A stirring ball (18) is movably arranged in the sample cylinder (1), and the stirring ball (18) is located between the sampling connector (3) and the separation piston (202), and the diameter of the stirring ball (18) is smaller than the inner diameter of the sample cylinder (1).

7. The method for using the formation fluid sampling device according to claim 6, characterized in that: A clearance groove (19) is provided on each side of the separation piston (202) and the sampling joint (3) close to each other, and both sides of the stirring ball (18) can enter the corresponding clearance groove (19) respectively.

8. The method for using the formation fluid sampling device according to claim 7, characterized in that: The inner side walls of the two clearance grooves (19) are respectively hemispherical, and the inner diameter of the clearance groove (19) is not less than the diameter of the stirring ball (18), so that the separation piston (202) can abut against the sampling connector (3), and the stirring ball (18) can be located in the spherical cavity formed by the two clearance grooves (19).

9. The method for using the formation fluid sampling device according to claim 5, characterized in that: The balancing plug (16) is threadedly connected to the sample cylinder (1), and an elastic sealing ring (20) is provided between the balancing plug (16) and the sample cylinder (1).

10. The method for using the formation fluid sampling device according to claim 5, characterized in that: The separating piston (202) and the nitrogen filling piston (201) are respectively provided with sealing O-rings (21), and the sealing O-rings (21) are in close contact with the inner wall of the sample cylinder (1) to achieve sealing.

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