Downhole high-pressure sealed plug-in connector valve

Abstract

The invention belongs to the field of petroleum workover treatment, and discloses an underground high-pressure sealed type plug-in connector valve which is characterized in that a wire A is welded with a central inserting rod, a thread is arranged at the left end of an outer sleeve, a locking ring A is in threaded connection with the outer sleeve, the locking ring A sequentially presses a sealing cap, a nut, a centralizing block and a sealing ring, the nut is in threaded connection with the central inserting rod, and an upper catching head is in threaded connection with a movable sleeve; the right end of the shell is provided with threads, the centralizing sleeve is in threaded connection with the shell and centralizes the conductive base, the conductive base is welded to the wire B, and the locking ring B is in threaded connection with the shell and sequentially presses the conductive base, the centralizing sleeve and the upper seal. The device is used for circuit butt joint in high-temperature and high-pressure formation fluid, a special sealing isolation mechanism is designed, and it can be guaranteed that the problem of electric leakage cannot occur.

Description

Technical Field

[0001] The invention belongs to the field of petroleum well repairing operations, and in particular relates to an underground high-pressure sealed connector valve. Background Art

[0002] In the current oilfield operation field, electric control well repair operation is a new branch that has just emerged in the well repair operation field. In underground electric control operations, a remote cable docking device is sometimes needed to achieve docking with the underground electric control tool. The male plug of the docking device is lowered into the well with a cable, and docked with the female plug after reaching the position. After docking, it can not only transmit the electric energy on the well to the underground electric control device through the cable, but also transmit the signal data up and down, so as to realize operations such as rotating the motor or opening and closing the valve. When the operation is completed, the cable is lifted up, and the connector is pulled out of the wellhead, thus ensuring a good passage in the well.

[0003] This device is a key tool for the electric control tool, and its performance determines the success of the construction. It has the following difficulties: Oil and water wells are usually filled with a large amount of high-temperature and high-pressure formation fluid, which contains a large amount of sand and scale particles and conductive ions. When the plug is docked in the fluid, it will cause the electrode to contact the conductive medium, resulting in a short circuit fault, which will lead to the failure of the operation. Therefore, it is necessary to develop a reliable downhole connector to solve the above problems. Summary of the invention

[0004] The invention provides a downhole high-pressure sealed connector, which can complete a reliable sealing docking function in formation fluid.

[0005] The above object of the present invention is achieved through the following technical solutions:

[0006] Downhole high-pressure sealed connector valve, wire A is welded to the center rod, the left end of the outer jacket is provided with a thread, the locking ring A is threadedly connected to the outer jacket, the locking ring A compresses the sealing cap, nut, straightening block, and sealing ring in sequence, the nut is threadedly connected to the center rod, the upper capture head is threadedly connected to the movable sleeve, the right end of the outer shell is provided with a thread, the straightening sleeve is threadedly connected to the outer shell, the straightening sleeve straightens the conductive seat, the conductive seat is welded to the wire B, the locking ring B is threadedly connected to the outer shell, and the conductive seat, the straightening sleeve, and the upper seal are pressed in sequence.

[0007] Furthermore, a threaded electronic control short section or a weighted short section is provided at the left end of the outer sleeve.

[0008] Furthermore, the right end of the shell is provided with a threaded connection for underground electrical equipment.

[0009] Furthermore, the upper seal is made of soft rubber.

[0010] Furthermore, the lower seal is made of soft rubber.

[0011] The specific construction process is as follows:

[0012] (1) Connect the delivery plug according to actual needs, and lower the delivery plug into the well along with the cable;

[0013] (2) The docking socket is connected to the upper part of the underground electrical appliance. When the delivery plug reaches the docking socket, the delivery plug is inserted into the docking socket under the action of gravity;

[0014] (3) The central plug inside the delivery plug contacts the conductive seat inside the docking seat, and the electrical energy or electrical signal is transmitted to the wire B, which is connected to the downhole electrical appliance below to supply power to the downhole electrical appliance;

[0015] (4) Release: When the electric energy is used up, pull the working cable, the cable moves upward, driving the delivery plug upward, and the delivery plug is separated from the docking seat;

[0016] (5) Continue to pull up the cable and remove the delivery plug from the wellhead.

[0017] Furthermore, a weight component is connected to the upper portion of the delivery plug in step (1);

[0018] Furthermore, the weighting component is a weighting rod.

[0019] The beneficial effects of the present invention compared with the prior art are:

[0020] The device is used for circuit docking in high-temperature and high-pressure formation fluid. Since the well is full of formation fluid, this fluid is generally an oil-water mixture, accompanied by a large amount of conductive ions and a small amount of formation sand, and the fluid temperature can reach 120°C and the pressure can reach 30MPa. In such an environment, it is very difficult to dock a plug that needs to reverse high-voltage electricity and ensure that there is no leakage or short circuit. In view of this problem, the present invention designs a special sealing isolation mechanism to ensure that there is no leakage problem. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0022] Figure 1 This is a schematic diagram of the structure of the present invention, with the delivery plug on the left and the docking seat on the right;

[0023] Figure 2 This is a schematic diagram of the construction process;

[0024] Figure 3 It is a schematic diagram of the docking process status. State a is when the delivery plug and the docking socket are not in contact, state b is when the delivery plug and the docking socket are just in contact, and state c is when the delivery plug and the docking socket continue to contact until the center plug rod contacts the conductive socket to complete the electrical docking.

[0025] Wherein: 1 conductor A, 2 locking ring A, 3 sealing cap, 4 nut, 5 straightening block, 6 sealing ring, 7 outer sleeve, 8 silicone grease A, 9 movable sleeve, 10 center plug rod, 11 upper capture head, 12 upper seal, 13 lower seal, 14 outer shell, 15 straightening sleeve, 16 sealing ring, 17 silicone grease B, 18 conductive seat, 19 locking ring B, 20 conductor B. DETAILED DESCRIPTION

[0026] In order to have a clearer understanding of the technical features, purposes and beneficial effects of the present invention, the technical scheme of the present invention is now described in detail in conjunction with the following specific embodiments, but it should not be understood as limiting the scope of the present invention. Unless otherwise specified, the experimental methods used in the present invention are all conventional methods, and the equipment used can be obtained from commercial channels.

[0027] Example 1

[0028] Invent a downhole high pressure sealed connector, the device is divided into two parts, the left one is the delivery plug, the right one is the docking seat. See the attached structure Figure 1 , the left side is the top, and the right side is the bottom. It includes wire A1, wire B20, locking ring A2, locking ring B19, sealing cap 3, nut 4, straightening block 5, sealing ring 6, etc.

[0029] The delivery plug is composed of: a conductor A1, a locking ring A2, a sealing cap 3, a nut 4, a straightening block 5, a sealing ring 6, a jacket 7, silicone grease A8, a movable sleeve 9, a center plug rod 10, an upper capture head 11, and an upper seal 12.

[0030] The docking seat is composed of: a lower seal 13, an outer shell 14, a straightening sleeve 15, a sealing ring 16, silicone grease B17, a conductive seat 18, a locking ring B19, and a wire B20.

[0031] Connection instructions: Wire A1 plays a conductive role and is welded together with the center plug rod 10 to play the role of electrical connection. The left end of the outer sleeve 7 is a thread, which is reserved for the connection thread of other equipment (such as electronic control short sections or weighted short sections). The locking ring A2 is threadedly connected to the outer sleeve 7, and the locking ring A2 can compress the sealing cap 3+nut 4+righting block 5+sealing ring 6. The nut 4 is threadedly connected to the center plug rod 10. The upper capture head 11 is threadedly connected to the movable sleeve 9. The upper seal 12 is soft rubber, which can play a role in isolating from the formation fluid.

[0032] The lower seal 13 is made of soft rubber and can be isolated from the formation fluid. The right end of the outer shell 14 is threaded, and this thread is reserved for connecting the downhole electrical equipment. The straightening sleeve 15 is threadedly connected to the outer shell 14, and the straightening sleeve 15 straightens the conductive seat 18. The conductive seat 18 is welded to the wire B20 to play the role of electrical connection. The locking ring B19 is threadedly connected to the outer shell 14 to compress the conductive seat 18+the straightening sleeve 15+the upper seal 12.

[0033] Principle description: Figure 3 Shown

[0034] (1) As the tool moves downward, the formation fluid pressure increases, and the formation fluid automatically squeezes the movable sleeve 9, causing the movable sleeve 9 to move slightly inward. However, the inside of the tool is filled with silicone grease A8, and the internal and external pressures are instantly balanced. See attached. Figure 3 a in;

[0035] (2) When the delivery plug and the docking seat just come into contact, the chamfers on the upper side of the upper catch head 11 and the housing 14 play a role in centering the docking. Figure 3 b in;

[0036] (3) Continue to press down the plug downward, the center rod 10 pierces the upper seal 12 and the lower seal 13, and enters the conductive seat 18. The center rod 10 and the conductive seat 18 are in contact to complete the electrical connection. See attached. Figure 3 c in.

[0037] This device is used for circuit connection in high temperature and high pressure formation fluid. The connection diagram is attached. Figure 1 , the tool action status diagram is attached Figure 3 The specific construction process is as follows:

[0038] (1) Connect the delivery plug according to actual needs, see attached Figure 2 The delivery plug is lowered into the well along with the cable, and a weight-reducing component such as a weight-reducing rod is generally connected to the upper part of the delivery plug;

[0039] (2) The docking socket is connected to the upper part of the underground electrical appliance. When the delivery plug reaches the docking socket, the delivery plug can be inserted into the docking socket under the action of gravity;

[0040] (3) The central plug 10 inside the delivery plug contacts the conductive seat 18 inside the docking seat, so that the electrical energy or electrical signal is transmitted to the wire B20, and the wire B20 is connected to the downhole electrical appliance below, thereby realizing the function of supplying power to the downhole electrical appliance;

[0041] (4) Disengagement: When the electric energy is used up, the operating cable is pulled up, and the cable moves upward, thereby driving the delivery plug upward, and the delivery plug is separated from the docking seat, thereby achieving the disengagement action;

[0042] (5) Continue to pull up the cable and remove the delivery plug from the wellhead.

[0043] The above-described embodiments are only preferred embodiments of the present invention, but not all feasible embodiments of the present invention. For those skilled in the art, any obvious changes made thereto without departing from the principles and spirit of the present invention should be considered to be included in the scope of protection of the claims of the present invention.

Claims

1. Downhole high pressure sealed connector valve, characterized in that: The conductor A (1) is welded to the central plug rod (10), the left end of the outer sleeve (7) is provided with a thread, the locking ring A (2) is threadedly connected to the outer sleeve (7), the locking ring A (2) sequentially presses the sealing cap (3), the nut (4), the straightening block (5), and the sealing ring (6), the nut (4) is threadedly connected to the central plug rod (10), the upper capture head (11) is threadedly connected to the movable sleeve (9), the right end of the outer shell (14) is provided with a thread, the straightening sleeve (15) is threadedly connected to the outer shell (14), the straightening sleeve (15) straightens the conductive seat (18), the conductive seat (18) is welded to the conductor B (20), the locking ring B (19) is threadedly connected to the outer shell (14), and sequentially presses the conductive seat (18), the straightening sleeve (15), and the upper seal (12).

2. The downhole high pressure sealed connector valve according to claim 1, characterized in that: The left end of the outer sleeve (7) is provided with a threaded connection electronic control short section or a weighted short section.

3. The downhole high pressure sealed connector valve according to claim 1, characterized in that: The right end of the housing (14) is provided with a thread for connecting underground electrical equipment.

4. The downhole high pressure sealed connector valve according to claim 1, characterized in that: The upper seal (12) is made of soft rubber.

5. The downhole high pressure sealed connector valve according to claim 1, characterized in that: The lower seal (13) is made of soft rubber.

6. The plug-in method of the underground high-pressure sealed plug-in valve according to claim 1, characterized in that: The following steps are involved: (1) Connect the delivery plug according to actual needs, and lower the delivery plug into the well along with the cable; (2) The docking socket is connected to the upper part of the underground electrical appliance. When the delivery plug reaches the docking socket, the delivery plug is inserted into the docking socket under the action of gravity; (3) The central plug (10) inside the delivery plug contacts the conductive seat (18) inside the docking seat, and the electric energy or electric signal is transmitted to the wire B (20). The wire B (20) is connected to the underground electrical equipment below to supply power to the underground electrical equipment; (4) Release: When the electric energy is used up, pull the working cable, the cable moves upward, driving the delivery plug upward, and the delivery plug is separated from the docking seat; (5) Continue to pull up the cable and remove the delivery plug from the wellhead.

7. The plug-in method of the underground high-pressure sealed plug-in valve according to claim 6, characterized in that: Step (1) A weight component is connected to the upper part of the delivery plug.

8. The plug-in method of the underground high-pressure sealed plug-in valve according to claim 7, characterized in that: The weighted component is a weighted rod.

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