Flow choking device

Abstract

The invention belongs to the technical field of petroleum logging, and particularly relates to a flow choking device. The flow choking device provided by the embodiment of the invention is provided with a cable channel for a cable to pass through, and the flow choking device comprises a main body, two pistons which are oppositely arranged, an oil supply assembly, a sealing element and two ejector rods. The two pistons which are oppositely arranged are movably arranged in the main body, an oil cavity is defined by the two pistons and the main body, and mounting channels are formed in the opposite sides of the two pistons; the oil supply assembly communicates with the oil cavity so that hydraulic oil can be fed into or pumped out of the oil cavity. The sealing element is mounted in the mounting channel, a first through hole is formed in the sealing element, the first through hole is formed in the cable channel, and the cable is assembled in the first through hole; the two ejector rods are arranged on the two sides of the body respectively, one end of each ejector rod is connected with the body, and the other end of each ejector rod is arranged in the mounting channel on the same side and makes contact with the sealing piece.

Description

Technical Field

[0001] The present invention relates to the technical field of petroleum well logging, and in particular to a flow blocking device. Background Art

[0002] When testing and adjusting the water injection wells in oil fields, the test instrument should be lowered into the well with a cable to test and adjust the well section. Since the wellhead pressure is greater than zero, there are problems of blowout and overflow, so a blowout preventer should be installed at the wellhead. At present, in the process of testing water injection wells in major oil fields in my country, the wellhead blowout prevention sealing devices commonly used mostly use threaded buckles to tighten the packing pads to enhance the sealing effect. Although high-pressure blowout prevention control devices are used, due to the high pressure in the water injection wells, overflow still occurs more or less, and the overflow volume changes with the pressure in the well, the change of cable thickness, and the tightness of the control device. Most of the overflowed well fluid is discharged to the well site, which pollutes the environment and brings great inconvenience to the on-site operators.

[0003] It can be seen from the current situation and existing problems that solving the overflow and leakage of test equipment is the fundamental to achieving high quality and zero pollution in refined water injection. Therefore, how to further improve the sealing effect of the cable and reduce the pollution caused by overflow and leakage during operation is an urgent problem to be solved. Summary of the invention

[0004] The present application aims to solve the technical problems of low cable sealing effect and high wellhead overflow in the related technology to a certain extent. To this end, the present application provides a flow blocking device.

[0005] The blocking device provided in the embodiment of the present application has a cable channel for the cable to pass through, including:

[0006] main body;

[0007] Two pistons are arranged opposite to each other and are movably arranged in the main body. The two pistons and the main body form an oil chamber, and a mounting channel is arranged on the opposite sides of the two pistons.

[0008] An oil supply assembly, connected to the oil chamber, to pass hydraulic oil into or out of the oil chamber;

[0009] A sealing member is installed in the installation channel, and the sealing member is provided with a first through hole, the first through hole is arranged in the cable channel, and the cable is assembled in the first through hole;

[0010] Two push rods are arranged on both sides of the main body, one end of the push rod is connected to the main body, and the other end is arranged in the installation channel on the same side and contacts the sealing component.

[0011] In some embodiments, the main body includes an intermediate joint and two oppositely arranged outer shells, both ends of the intermediate joint are respectively arranged in the two outer shells, and the two pistons are movably arranged in the two outer shells, and the intermediate joint and the two pistons form the oil chamber.

[0012] In some embodiments, a sealing ring is provided between the two shells and the middle joint.

[0013] In some embodiments, the sealing ring is an O-type fluororubber ring.

[0014] In some embodiments, the piston includes a piston body and a piston cylinder connected to the piston body, the intermediate joint and the two piston bodies form the oil chamber, and the mounting channel is disposed in the piston cylinder.

[0015] In some embodiments, the oil supply assembly includes an oil receiving pipe, an oil pump, and an oil tank that are connected in sequence, and the oil receiving pipe is in communication with the oil chamber.

[0016] In some embodiments, the oil pump is an electric hydraulic pump.

[0017] In some embodiments, the oil receiving pipe is a right-angle elbow.

[0018] In some embodiments, the seal comprises a plurality of closely spaced sealing pads.

[0019] In some embodiments, the material of the sealing member is polyurethane.

[0020] The choke device proposed in the embodiment of the present application has the following characteristics: when the oil supply assembly passes the hydraulic oil into the oil chamber, the hydraulic pressure pushes the two pistons to move in opposite directions, and the seal also moves accordingly. Since the seal is in contact with the push rod at the same time, the seal is pressurized, expanded and compressed under the push of the piston, so that the gap between the inner wall of the first through hole and the cable is reduced, thereby avoiding the movement of the cable, effectively improving the sealing effect of the cable, and reducing the occurrence of overflow to a certain extent. In addition, the choke device is provided with double pistons, so that both ends of the cable can be effectively sealed, thereby enhancing the sealing effect, thereby further enhancing the choke effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following is a brief introduction to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 A schematic structural diagram of the flow blocking device is shown.

[0023] Reference numerals:

[0024] 100- flow blocking device, 110- main body, 111- shell, 112- middle joint, 120- piston, 121- piston body, 122- piston cylinder, 130- oil supply assembly, 131- oil connecting pipe, 132- oil pump, 140- seal, 141- seal pad, 150- push rod, 160- seal ring. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0026] It should be noted that all directional indications in the embodiments of the present application are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0027] In this application, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" 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 an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0028] In addition, in this application, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0029] The water injection status of oil fields is directly related to the increase and stability of oil field production. In the past, most of the water injection in oil fields was general water injection. In recent years, in order to improve the final recovery rate, oil fields have begun to finely inject water, that is, stratified quantitative water injection. This operation technology has gradually developed from the initial steel wire casting and catching operation to the cable direct reading measurement and adjustment technology with more intuitive, strong operability and high operation efficiency. In order to improve the accuracy of single-layer injection, the use of cable direct reading and adjustment technology has become the mainstream process of fine water injection.

[0030] When testing and adjusting the water injection well in the oil field, the test instrument should be lowered into the well with a cable to test and adjust the well section. Since the wellhead pressure is greater than zero, there are problems of blowout and overflow, so a blowout preventer should be installed at the wellhead, and the cable connecting the test instrument should pass through the middle of the blowout preventer. Since the surface of the cable is armored and not smooth, the seal between the blowout preventer and the cable cannot be guaranteed, and well fluid will flow out, which is called overflow. The overflowing well fluid will pollute the environment.

[0031] In the related technology, in the process of testing water injection wells in major oil fields, the wellhead blowout prevention sealing devices commonly used mostly use threaded buckles to tighten the packing pads to enhance the sealing effect. Although a high-pressure blowout prevention control device is used, due to the high pressure in the water injection well, overflow still occurs to a greater or lesser extent. The overflow volume also changes with the pressure in the well, the change in the thickness of the cable, and the tightness of the control device. Most of the overflowed well fluid is discharged to the well site, which pollutes the environment and brings great inconvenience to the operators on site. When testing the downhole cable, there is also a method of using a wellhead grease sealing device to seal the wellhead. However, although this method can meet the on-site use environment, it is difficult to meet the ideal requirements due to its too long structure, the relatively complex structure, the time-consuming and labor-intensive work, the difficulty and intensity are relatively large, and it is rarely promoted and adopted in well testing.

[0032] In order to solve the problems in the related art to a certain extent, the embodiment of the present application provides a flow blocking device, which effectively improves the sealing effect of the cable and reduces the occurrence of overflow to a certain extent.

[0033] The present application is described below with reference to the accompanying drawings and specific embodiments:

[0034] Combination Figure 1The embodiment of the present application provides a flow blocking device 100, which has a cable channel for the cable to pass through. The flow blocking device 100 includes a main body 110, two pistons 120 arranged opposite to each other, an oil supply assembly 130, a seal 140 and two push rods 150. The two pistons 120 arranged opposite to each other are movably arranged in the main body 110, and the two pistons 120 and the main body 110 form an oil chamber, and the two pistons 120 are provided with a mounting channel on the opposite side; the oil supply assembly 130 is connected to the oil chamber to pass the hydraulic oil into or out of the oil chamber; the seal 140 is installed in the mounting channel, and the seal 140 is provided with a first through hole, the first through hole is arranged in the cable channel, and the cable is assembled in the first through hole; the two push rods 150 are arranged on both sides of the main body 110, one end of the push rod 150 is connected to the main body 110, and the other end is arranged in the mounting channel on the same side and contacts the seal 140.

[0035] The cable needs to pass through the flow blocking device 100, that is, the components involved in the flow blocking device 100 need to be opened accordingly to allow the cable to pass through, and the channel matches the outer diameter of the cable. The main body 110 is the basic component of the flow blocking device 100 of the present application. The main body 110 can provide an installation basis for other at least some components of the flow blocking device 100, and can also serve the purpose of protecting other at least some components of the flow blocking device 100. The main body 110 can be made of titanium alloy material, and two pistons 120 arranged oppositely are movably arranged in the main body 110. The two pistons 120 and the main body 110 surround an oil chamber, that is, the piston 120 can move along the length direction of the main body 110, the oil chamber is arranged between the two pistons 120, and the oil supply assembly 130 is connected to the oil chamber. When the oil supply assembly 130 passes hydraulic oil into the oil chamber, the two pistons 120 will move in opposite directions under the hydraulic action.

[0036] The two pistons 120 are provided with a mounting channel on the opposite side, and the seal 140 is installed in the mounting channel, that is, the seal 140 is in contact with the inner wall of the mounting channel. The seal 140 is provided with a first through hole arranged in the cable channel, and a cable is installed in the first through hole to prevent the cable from being worn. Of course, since there are two pistons 120, there are also two seals 140, and they are arranged one by one with the ejector rods 150. One end of the push rod 150 is connected to the main body 110, and the other end is arranged in the installation channel on the same side and contacts the seal 140, that is, the push rod 150 is fixed on the main body 110. When the oil supply assembly 130 passes the hydraulic oil into the oil chamber, the hydraulic pressure pushes the two pistons 120 to move oppositely, and the seal 140 also moves accordingly. Since the seal 140 is in contact with the push rod 150 at the same time, the seal 140 is pressurized, expanded and compressed under the push of the piston 120, so that the gap between the inner wall of the first through hole and the cable is reduced, thereby preventing the cable from moving, effectively improving the sealing effect of the cable, and reducing the occurrence of overflow to a certain extent.

[0037] Furthermore, the flow blocking device 100 is provided with double pistons 120, so that both ends of the cable can be effectively sealed, thereby enhancing the sealing effect on the cable and further enhancing the flow blocking effect.

[0038] In some embodiments, the main body 110 includes an intermediate joint 112 and two oppositely arranged outer shells 111, the two ends of the intermediate joint 112 are respectively arranged in the two outer shells 111, and the two pistons 120 are movably arranged in the two outer shells 111, and the intermediate joint 112 and the two pistons 120 form an oil chamber.

[0039] The two ends of the intermediate joint 112 are respectively sleeved in the two shells 111 to connect the two shells 111. The oil supply assembly 130 can be connected to the intermediate joint 112 to communicate with the oil chamber. Of course, it is obvious that the main body 110, the push rod 150, the intermediate joint 112, and the piston 120 are also provided with channels for the cable to pass through.

[0040] To prevent the hydraulic oil in the oil chamber from leaking out, a sealing ring 160 is provided between the two housings 111 and the intermediate joint 112 to ensure the sealing of the oil chamber. Specifically, the sealing ring 160 can be an O-type fluororubber ring, and one, two or more sealing rings 160 can be provided, without limitation.

[0041] In some embodiments, the piston 120 includes a piston 120 body and a piston 120 cylinder connected to the piston 120 body, the middle joint 112 and the two piston 120 bodies form an oil chamber, and the mounting channel is provided in the piston 120 cylinder.

[0042] That is, the interior of the piston 120 is configured as an installation channel for installing the seal 140. The seal 140 may include a plurality of closely arranged sealing pads 141. Of course, the plurality of sealing pads 141 are all provided with through holes and are coaxially arranged so that the plurality of through holes form a first through hole.

[0043] Specifically, the sealing gasket 141 can be made of wear-resistant polyurethane material.

[0044] In some embodiments, the oil supply assembly 130 includes an oil receiving pipe 131 , an oil pump 132 , and an oil tank that are sequentially connected, and the oil receiving pipe 131 is in communication with the oil chamber.

[0045] By turning on the oil pump 132, the hydraulic oil in the oil tank can be passed into or drawn out of the oil chamber through the oil receiving pipe 131. Specifically, the oil pump 132 can be an electric hydraulic pump, and the oil receiving pipe 131 can be a right-angle elbow.

[0046] The blocking device 100 proposed in the embodiment of the present application, during the water injection well testing process, introduces hydraulic oil into the oil chamber through the oil supply assembly 130 to push the two pistons 120 to move away from each other, so that the two seals 140 are pressurized, expanded and compressed under the thrust of the pistons 120, preventing the cable from moving, and further preventing the test water flow from rising with the cable to form an overflow, thereby achieving double flow blocking and playing a better sealing role. Combined with the actual well logging construction, overflow control is achieved without increasing a lot of costs.

[0047] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification.

[0048] In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0049] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A flow blocking device, characterized in that: The device has a cable channel for the cable to pass through, and includes: main body; Two pistons are arranged opposite to each other and are movably arranged in the main body. The two pistons and the main body form an oil chamber, and a mounting channel is arranged on the opposite sides of the two pistons. An oil supply assembly, connected to the oil chamber, to pass hydraulic oil into or out of the oil chamber; A sealing member is installed in the installation channel, and the sealing member is provided with a first through hole, the first through hole is arranged in the cable channel, and the cable is assembled in the first through hole; Two push rods are arranged on both sides of the main body, one end of the push rod is connected to the main body, and the other end is arranged in the installation channel on the same side and contacts the sealing component.

2. The flow blocking device according to claim 1, characterized in that: The main body comprises an intermediate joint and two oppositely arranged outer shells, the two ends of the intermediate joint are respectively arranged in the two outer shells, and the two pistons are movably arranged in the two outer shells, and the intermediate joint and the two pistons form the oil chamber.

3. The flow blocking device according to claim 2, characterized in that: A sealing ring is arranged between the two shells and the middle joint.

4. The flow blocking device according to claim 3, characterized in that: The sealing ring is an O-type fluororubber ring.

5. The flow blocking device according to any one of claims 1 to 4, characterized in that: The piston comprises a piston body and a piston cylinder connected to the piston body, the intermediate joint and the two piston bodies form the oil chamber, and the mounting channel is arranged in the piston cylinder.

6. The flow blocking device according to any one of claims 1 to 4, characterized in that: The oil supply assembly comprises an oil receiving pipe, an oil pump and an oil tank which are connected in sequence, and the oil receiving pipe is communicated with the oil chamber.

7. The flow blocking device according to claim 6, characterized in that: The oil pump is an electric hydraulic pump.

8. The flow blocking device according to claim 1, characterized in that: The oil receiving pipe right angle elbow.

9. The flow blocking device according to claim 1, characterized in that: The sealing member comprises a plurality of sealing pads which are arranged closely.

10. The flow blocking device according to claim 1, characterized in that: The material of the sealing element is polyurethane.

Images