Hydraulic control type high-pressure sample transfer valve

Abstract

The invention discloses a hydraulic control type high-pressure sample transfer valve, and belongs to the technical field of sample transfer control devices for high-pressure samples in laboratories. Comprising a piston assembly and a sample transfer valve body, the piston assembly comprises a piston outer cylinder; one end of the sample transfer valve body is matched and connected with the piston outer cylinder, and the other end of the sample transfer valve body is provided with a first connecting screw thread for connecting a sampler valve; one end of the piston is connected with a piston rod, and the other end of the piston is connected with a piston stroke rod; one end of the piston stroke rod extends out of the piston outer cylinder; a hand pump pipeline connector is arranged on the wall face of a closed cavity formed by the piston outer cylinder and the piston. A needle valve assembly and a sample transfer high-pressure pipeline interface are arranged on the sample transfer valve body, and the sample transfer high-pressure pipeline interface is used for being connected with test equipment or a high-pressure brine pump; the piston of the sample transfer valve can be remotely controlled by the hand pump to perform opening and closing operation, and the hand pump is far away from the sampler, so that the safety of operators can be well protected.

Description

Technical Field

[0001] The invention belongs to the technical field of sample transfer control devices for high-pressure samples in laboratories, and relates to a hydraulically controlled high-pressure sample transfer valve. Background Art

[0002] The reservoir of the "three super" gas well is buried more than 8,000 meters deep, the reservoir temperature exceeds 180℃, and the reservoir pressure exceeds 130MPa. In order to formulate a reasonable development plan, it is necessary to lower the downhole fluid sampling tool to obtain the reservoir fluid in the original state to obtain accurate reservoir fluid test data. After the downhole fluid sampler obtains the high-temperature and high-pressure fluid sample in the well, it is necessary to transfer the high-temperature and high-pressure fluid sample from the sampler to the test and analysis equipment through the sample transfer valve in the laboratory. When the conventional sample transfer valve is used, due to the huge pressure difference between the inside and outside of the sample transfer valve, all the pressure inside the sample transfer valve acts on the valve top rod. The higher the pressure, the greater the outward push force on the valve top rod. In the field test, when the pressure reaches 45MPa, it is very difficult for the valve top rod to rotate (the valve top rod diameter is 8mm). Forcibly rotating the sample transfer valve to operate the valve stem is likely to cause thread damage and lead to high-pressure fluid leakage. The ultra-high pressure difference may even shear the thread, causing the sample transfer valve to jump off, which is harmful to the personal safety of the on-site operators and poses a major safety hazard. Summary of the invention

[0003] The purpose of the present invention is to solve the technical problem in the prior art that the sample transfer valve is prone to popping off due to excessive internal and external pressure difference when transferring samples, which endangers the personal safety of on-site operators, and to provide a hydraulically controlled high-pressure sample transfer valve.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] In the first aspect, the present invention provides a hydraulically controlled high-pressure sample transfer valve, comprising a piston assembly and a sample transfer valve body; the piston assembly comprises a piston outer cylinder; one end of the sample transfer valve body is cooperatively connected with the piston outer cylinder, and the other end is provided with a first connecting thread for connecting to a sampler valve; a piston is provided in the piston outer cylinder; one end of the piston is connected to a piston rod, and the other end is connected to a piston travel rod; one end of the piston travel rod extends out of the piston outer cylinder; a hand pump pipeline interface is provided on the wall surface of the closed cavity formed by the piston outer cylinder and the piston; The sample transfer valve body is provided with a needle valve assembly and a sample transfer high-pressure pipeline interface, and the sample transfer high-pressure pipeline interface is used to connect a testing device or a high-pressure brine pump; the sample transfer valve body is also provided with a push rod which is coaxial with and matingly connected to the piston rod, and the push rod is used to push open the valve core of the sampler valve assembly; the mating connection between the piston outer cylinder and the piston stroke rod, the mating connection between the piston and the piston outer cylinder, the mating connection between the sample transfer valve body and the piston rod, and the mating connection between the sample transfer valve body and the sampler valve assembly are all provided with sealing devices.

[0006] The present invention is further improved in that:

[0007] The piston outer cylinder is connected to the sample transfer valve body through a second connecting thread.

[0008] The thread spacing of the first connecting thread is 3 mm.

[0009] The ratio of the piston area to the piston rod area of ​​the piston is 9:1.

[0010] The needle valve assembly is provided with a valve needle for controlling the on-off of the fluid; a needle valve baffle is also fixed to the needle valve assembly by bolts to prevent the valve needle from being twisted off; the needle valve assembly adopts a long wrench switch.

[0011] The length of the piston rod is smaller than the length of the push rod; the diameter of the piston rod is smaller than the diameter of the push rod.

[0012] The piston rod is connected to the push rod via threads.

[0013] The sealing device is a sealing O-ring.

[0014] The needle valve assembly is connected to the transfer valve body by coarse threads.

[0015] The hand pump pipeline interface is a compression-type metal seal.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The present invention discloses a hydraulically controlled high-pressure sample transfer valve. A hand pump pipeline interface is provided on the wall surface of the closed cavity formed by the piston outer cylinder and the piston. When the hydraulically controlled high-pressure sample transfer valve is working, a hand pump is externally connected. The hand pump is operated to pump hydraulic oil to push the piston downward. The piston rod pushes the push rod to open the valve of the sampler. The interior of the sampler is connected to the sample transfer valve. The hand pump is depressurized. The spring of the valve pushes the sample transfer valve piston to reset. The valve of the sampler is closed. Repeated operation of the hand pump can open the valve of the sampler again. In addition, a piston stroke rod is also provided. Whether the valve of the sampler is open can be observed through the piston stroke rod. The present invention can remotely control the piston of the sample transfer valve through the hand pump to perform switch operation, away from the sampler, and can well protect the safety of the operator.

[0018] Furthermore, the thread pitch of the second connecting thread is changed from the traditional 1.5mm to 3mm, which can increase the allowable shear force of the thread, and a sealing O-ring is provided at the front section of the connecting thread, which reduces the force area of ​​the connecting thread and the shear force it is subjected to, thereby increasing the connection safety of the hydraulically controlled high-pressure transfer valve.

[0019] Furthermore, the ratio of the piston area to the piston rod area is 9:1. When the pressure of the fluid in the sampler is 140MPa, the pressure that needs to be applied by the piston of the sample transfer valve is P=140÷9≈15.56MPa. In fact, only 15.56MPa of pressure is needed to open the sampler valve. When the back pressure in the space between the sampler and the sample transfer valve is 90MPa, applying 10MPa of pressure to the piston can push the push rod to open the sampler valve, so that the inside of the sample transfer valve is connected to the sampler. Low pressure drives high pressure, which is safer and more reliable.

[0020] Furthermore, the needle valve assembly adopts a long wrench switch, which makes the operation safer.

[0021] Furthermore, the length of the piston rod is smaller than the length of the push rod; the diameter of the piston rod is smaller than the diameter of the push rod, the valve stem is short, the push rod is thick and long, and the thrust is stronger. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0023] Figure 1 This is a schematic diagram of the main cross-sectional structure of a conventional rotary valve;

[0024] Figure 2 It is a schematic diagram of the main cross-sectional structure of the hydraulically controlled high-pressure transfer valve in the present invention;

[0025] Figure 3 It is a schematic diagram of the main cross-sectional structure of the hydraulically controlled high-pressure sample transfer valve in the open state of the present invention;

[0026] Figure 4 It is a schematic diagram of the working principle of the hydraulically controlled high-pressure sample transfer valve in the present invention;

[0027] Figure 5 A hexagonal wrench is provided for lengthening the switch of the needle valve in the present invention.

[0028] Among them: 101-handle; 102-operating valve stem; 103-pressure cap; 104-valve body; 105-high-pressure pipeline interface; 106-needle valve; 107-operating valve stem thread; 108-operating valve stem sealing gasket; 109-sampler connection thread; 110-sealing ring; 111-needle valve sealing gasket; 201-piston travel rod; 202-travel rod sealing O-ring; 203-piston; 204-piston rod; 205-piston outer cylinder; 206-hand pump pipeline interface; 207-second connection thread; 208-piston rod sealing O-ring; 20 9- sample transfer valve body; 210- valve needle; 211- needle valve sealing gasket; 212- first connecting thread; 213- valve body sealing O-ring; 214- sample transfer high-pressure pipeline interface; 215- push rod; 216- hand pump; 217- three-way valve; 218- hydraulic pipeline and connector; 219- extended hexagonal wrench; 220- piston assembly; 221- needle valve assembly; 222- valve needle baffle; 301- sampler vane valve assembly; 302- sampler; 401- sample heating device; 501- sample testing device; 601- high-pressure brine pump. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0032] In the description of the embodiments of the present invention, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. indicate an orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the invention is usually placed when in use, it is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0033] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", which does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0034] In the description of the embodiments of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] The present invention is further described in detail below in conjunction with the accompanying drawings:

[0036] See also Figure 2 and Figure 3 The embodiment of the present invention discloses a hydraulically controlled high-pressure sample transfer valve, comprising a piston assembly 220 and a sample transfer valve body 209; the piston assembly 220 comprises a piston outer cylinder 205; one end of the sample transfer valve body 209 is connected to the piston outer cylinder 205 through a second connecting thread 207, and the other end is provided with a first connecting thread 212 for connecting a sampler valve, and the thread distance of the first connecting thread 212 is 3mm; a piston 203 is provided in the piston outer cylinder 205; one end of the piston 203 is connected to a piston rod 2 04, and the other end is connected with a piston travel rod 201; the ratio of the piston area of ​​the piston 203 to the area of ​​the piston rod 204 is 9:1, and one end of the piston travel rod 201 extends out of the piston outer tube 205; a hand pump pipeline interface 206 is arranged on the wall surface of the closed cavity formed by the piston outer tube 205 and the piston 203, and the hand pump pipeline interface 206 is a compression type metal seal, a conical sealing block is inserted into the pipeline, and a sealing effect is achieved by tightening the nut with a wrench, which is similar to a swagelok joint.

[0037] The piston outer tube is designed with a corresponding female buckle to connect with it, which is located on the side of the outer tube, 5mm away from the top of the piston cavity. The sample transfer valve body 209 is connected to the needle valve assembly 221 and the sample transfer high-pressure pipeline interface 214 through a thick thread. The sample transfer high-pressure pipeline interface 214 is used to connect the test equipment or the high-pressure brine pump; the needle valve assembly 221 is provided with a valve needle 210 for controlling the fluid channel switch, and a valve needle baffle 222 is also provided to prevent the valve needle 210 from being twisted off when it is opened.

[0038] See also Figure 5 The needle valve assembly 221 is switched by a long hexagonal wrench; the sample transfer valve body 209 is also provided with a push rod 215 which is coaxial with the piston rod 204 and connected by threaded fit, and the push rod 215 is used to push open the valve core of the sampler valve assembly 301; the length of the piston rod 204 is less than the length of the push rod 215; the diameter of the piston rod 204 is less than the diameter of the push rod 215. Figure 2 As shown, it is a schematic diagram of the structure of a conventional sample transfer valve, the operating valve stem 102 is 137mm long and 8mm in outer diameter. The hydraulically controlled high-pressure sample transfer valve in the embodiment of the present invention divides the valve stem into two parts, the piston rod 204 integrated with the piston 203 is 45mm long (shortened from 137mm to 45mm, outer diameter 8mm), and the other part is the push rod 215, the outer diameter of the push rod 215 is increased from 8mm to 12mm, and the length is 92mm (92+45=137mm original valve stem length). The piston rod 204 is short, the push rod 215 is thick and long, and the thrust is stronger. A travel rod sealing O-ring 202 is provided at the matching connection between the piston outer tube 205 and the piston travel rod 201; a sealing O-ring is provided at the matching connection between the piston 203 and the piston outer tube 205; two piston rod sealing rings 208 are provided at the matching connection between the sample transfer valve body 209 and the piston rod 204; two valve body sealing O-rings 213 are provided at the matching connection between the sample transfer valve body 209 and the sampler valve assembly 301, and the two valve body sealing O-rings 213 are arranged in front of the first connecting thread 212.

[0039] The assembly process of the present invention is as follows:

[0040] The piston assembly 220 (piston stroke rod 201, piston 203, piston rod 204) is installed into the piston outer tube 205, the piston rod 204 is inserted into the transfer valve body 209 from the upper part and the second connecting thread 207 is tightened, the push rod 215 is inserted from the bottom of the transfer valve body 209 and threadedly connected with the piston rod 204, the needle valve assembly 210 and the sealing gasket are installed, the transfer valve body sealing O-ring 213, and the hydraulically controlled high-pressure transfer valve is assembled.

[0041] like Figure 3As shown, the sample transfer valve body 209 is connected to the sampler valve assembly 301, and the hand pump pipeline is connected to the hand pump pipeline interface 206. The hand pump 216 is operated to inject hydraulic oil to push the piston 203 downward, and the piston rod 204 pushes the push rod 215 to open the sampler valve assembly 301. The interior of the sampler 302 is connected to the sample transfer valve, and the hand pump 216 releases pressure. Under the action of the spring of the valve, the piston 203 of the sample transfer valve is pushed to reset, and the sampler valve is closed. Repeating the operation of the hand pump 216 can open the sampler valve assembly 301 again.

[0042] The working process of the present invention is as follows:

[0043] See also Figure 4 , connected with the sampler valve assembly 301 through the first connecting thread 212, the valve body sealing O-ring 213 and the joint sealing end face of the sampler valve assembly 301 form a seal; the hydraulic pipeline and the joint 218 are connected to the hand pressure pump pipeline interface 206, the valve needle 210 of the needle valve assembly 221 is opened, and the hand pressure pump 216 is used to open the sampler valve, and then the brine in the high-pressure brine pump 601 is used to drive all the samples in the sampler 302 into the sample testing device 501, because there is high pressure in the sampler 302 and the sample testing device 501 during the whole sample transfer process, and the pressure remains unchanged, so brine is needed for displacement. Injecting brine into the hydraulically controlled high-pressure sample transfer valve is used to balance the internal and external pressure difference of the sampler valve, waiting for the pressure in the sampler valve and the hydraulically controlled high-pressure sample transfer valve to be approximately equal to the internal pressure of the sampler 302, and the brine is located in the high-pressure brine pump 601. Then operate the hand pump 216 to inject hydraulic oil to push the piston 203 and the push rod 215 to open the sampler valve. After observing that the piston stroke rod 201 gradually enters the piston outer cylinder 205, it is proved that the sampler valve is fully opened. Close the needle valve on one side of the three-way valve 217 to keep the sampler valve on one side in an open state; open the needle valve on the other side of the three-way valve, open the sample transfer valve at the other end in the same way, open the valve needle 210 of the needle valve assembly 221, and the sample in the sampler 302 enters the test device through the high-pressure pipeline to complete the sample transfer operation. After the sample transfer is completed, remove the pressure of the hand pump 216, and the piston 203 of the sample transfer valve returns to its original position under the action of the spring of the sampler valve, and the piston stroke rod 201 extends out of the piston outer cylinder 205.

[0044] The function of the sample heating device 401 is to heat the sample in the sampler 302 to the original high temperature and high pressure state underground. The hydraulic high-pressure sample transfer valve on one side of the sampler 302 is connected to the high-pressure brine pump 601, and the hydraulic high-pressure sample transfer valve on the other side is connected to the sample testing device 501. Salt water is used to drive all the samples in the sampler into the sample testing device 501.

[0045] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A hydraulically controlled high-pressure sample transfer valve, characterized in that: The invention comprises a piston assembly (220) and a sample transfer valve body (209); the piston assembly (220) comprises a piston outer cylinder (205); one end of the sample transfer valve body (209) is connected to the piston outer cylinder (205), and the other end is provided with a first connection thread (212) for connecting to a sampler valve; a piston (203) is provided in the piston outer cylinder (205); one end of the piston (203) is connected to a piston rod (204), and the other end is connected to a piston travel rod (201); one end of the piston travel rod (201) extends out of the piston outer cylinder (205); a hand pump pipeline interface (206) is provided on the wall surface of the closed cavity formed by the piston outer cylinder (205) and the piston (203); A needle valve assembly (221) and a sample transfer high-pressure pipeline interface (214) are provided, and the sample transfer high-pressure pipeline interface (214) is used to connect a test device or a high-pressure brine pump; a push rod (215) coaxial with and matched with the piston rod (204) is also provided in the sample transfer valve body (209), and the push rod (215) is used to push open the valve core of the sampler valve assembly (301); the matching connection between the piston outer cylinder (205) and the piston stroke rod (201), the matching connection between the piston (203) and the piston outer cylinder (205), the matching connection between the sample transfer valve body (209) and the piston rod (204), and the matching connection between the sample transfer valve body (209) and the sampler valve assembly (301) are all provided with sealing devices.

2. The hydraulically controlled high-pressure sample transfer valve according to claim 1, characterized in that: The piston outer cylinder (205) is connected to the sample transfer valve body (209) via a second connecting thread (207).

3. The hydraulically controlled high-pressure sample transfer valve according to claim 1, characterized in that: The thread length of the first connecting thread (212) is 3 mm.

4. The hydraulically controlled high-pressure sample transfer valve according to claim 1, characterized in that: The ratio of the piston area of ​​the piston (203) to the area of ​​the piston rod (204) is 9:

1.

5. The hydraulically controlled high-pressure sample transfer valve according to claim 1, characterized in that: The needle valve assembly (221) is provided with a valve needle (210) for controlling the on / off of a fluid; a needle valve baffle (222) is also fixed to the needle valve assembly (221) by bolts to prevent the valve needle (210) from being twisted off; and the needle valve assembly (221) adopts a long wrench switch.

6. The hydraulically controlled high-pressure sample transfer valve according to claim 1, characterized in that: The length of the piston rod (204) is smaller than the length of the push rod (215); and the diameter of the piston rod (204) is smaller than the diameter of the push rod (215).

7. The hydraulically controlled high-pressure sample transfer valve according to claim 7, characterized in that: The piston rod (204) and the push rod (215) are connected via threads.

8. The hydraulically controlled high-pressure sample transfer valve according to claim 1, characterized in that: The sealing device is a sealing O-ring.

9. The hydraulically controlled high-pressure sample transfer valve according to claim 1, characterized in that: The needle valve assembly (221) is connected to the transfer valve body (209) by coarse thread.

10. The hydraulically controlled high-pressure sample transfer valve according to claim 1, characterized in that: The hand pump pipeline interface (206) is a compression-type metal seal.

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