Device for sealing wellhead cable of intelligent layered producing well and using method

Abstract

The invention relates to the technical field of oil field oil production engineering, and discloses a device for sealing a wellhead cable of an intelligent layered producing well, which comprises a sealing mechanism for connecting to a wellhead and ensuring the sealing property of the cable entering the wellhead; the pressing cap is used for fixing the cable in the sealing mechanism by applying uniform force; the copper ball is used for increasing uniform pressure on the cable when the pressing cap is screwed, ensuring that the cable is fastened and preventing external substances from entering; and the sealing gland is used for ensuring the sealing performance and protection of the whole system and preventing external liquid, impurities or solid particles from entering the sealing device. According to the sealing device, a cable can vertically penetrate out, the probability that the cable is damaged when the intelligent production well is led out of a casing gate during well completion is greatly reduced, meanwhile, the sealing device is provided with a lateral testing channel, compared with an original casing gate testing channel, the size of an instrument connector is reduced, the device is located above a well mouth, the labor intensity of workers can be reduced, and the working efficiency is improved. And collision is not easy to occur.

Description

Technical Field

[0001] The invention relates to the technical field of oil field production engineering, and in particular to a device design for sealing a wellhead cable of an intelligent stratified oil production well. Background Art

[0002] At present, the stratified production technology of domestic oil fields and wells is gradually developing towards intelligence. The cable-controlled intelligent stratified oil production technology developed at this stage mostly uses cables and downhole intelligent production distributors to control the downhole intelligent production distributors on the ground. It can collect downhole temperature, pressure, flow and other data in real time and can directly control downhole production. During the construction of the cable-controlled intelligent stratified oil production process, it is necessary to first lower the stratified production tubing string into the predetermined position in the well, hydraulically seal the packer and release it, and then lower the pumping tubing string carrying the cable to connect with the docking device of the production tubing string to realize the power supply and measurement and adjustment functions of the ground and downhole production tubing strings.

[0003] Since the cable control equipment needs to reserve a cable connector at the wellhead to provide a wiring interface for the ground control equipment. Affected by the weather environment at the production well site and the construction of the well site personnel, the cable head is external and has no fixed mechanism, which is easy to be damaged; at the same time, various tests need to be carried out regularly during the production process of the oil well, and most of the existing wellhead cable sealing devices are directly placed above the cable. When testing, the wellhead cable sealing device needs to be unlocked before testing can be carried out, which is inconvenient to use. Therefore, a device design for the wellhead cable sealing of intelligent stratified oil production wells is proposed to solve the above problems. Summary of the invention

[0004] In view of the deficiencies of the prior art, the present invention provides a device for sealing the wellhead cable of an intelligent stratified oil production well, which solves the problems in the prior art that the cable head is externally placed without a fixing mechanism and is easily damaged and inconvenient to use during testing.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: a device design for sealing the wellhead cable of an intelligent stratified oil production well, including a sealing mechanism for connecting to the wellhead and ensuring the sealing of the cable entering the wellhead; The compression cap secures the cable in the sealing mechanism by applying uniform force; The copper ball is used to increase the uniform pressure on the cable when the pressure cap is tightened, ensuring that the cable is tightened and preventing the entry of foreign substances; Sealing gland, used to ensure the sealing and protection of the entire system, preventing external liquids, impurities or solid particles from entering the sealing device; The port gland is used to cover and protect the port of the sealing mechanism to prevent foreign matter from entering the sealing device; Port seals, located inside the port gland, are used to provide additional sealing.

[0006] Preferably, a through hole is provided at the top of the sealing mechanism for a reserved cable connector to pass through.

[0007] Preferably, an outer wall of the port of the sealing mechanism is provided with an external thread, an inner wall of the sealing gland is provided with an internal thread, and the sealing gland is threadedly connected to the top of the sealing mechanism via the internal thread.

[0008] Preferably, a groove matching the size of the copper ball is provided in the middle of the sealing mechanism, and the copper ball is placed in the groove.

[0009] Preferably, an inner side wall of the top of the sealing mechanism is provided with an internal thread, an outer side wall of the pressure cap is provided with an external thread, and the pressure cap is threadedly connected to the top of the sealing mechanism.

[0010] Preferably, a cavity is provided in the middle of the sealing mechanism for accommodating the cable, and the cavity is in a "T" shape.

[0011] A method for using a device for sealing a wellhead cable of an intelligent stratified oil production well, comprising the following steps: Step 1: Connect the sealing device to the wellhead, and connect the sealing mechanism of the sealing device to the wellhead of the intelligent stratified oil production well; Step 2: reserve the cable and reserve enough space in the sealing groove of the sealing mechanism to accommodate the cable; Step 3: Place the copper ball carefully into the groove of the sealing mechanism; Step 4: Tighten the pressure cap to make it fit tightly with the sealing mechanism; Step 5: Install the sealing gland. After the cable is fixed and compressed, install the sealing gland on top of the pressure cap and tighten it. Step 6: Install the port sealing ring on the side port of the sealing mechanism; Step seven, install the port gland, install the port gland on the port of the sealing mechanism, and tighten it.

[0012] Preferably, when tightening the gland and the sealing cover, do not over-tighten to avoid damaging the cable or the sealing device.

[0013] Preferably, after all components are installed, a leak tightness check is performed.

[0014] Preferably, the installation steps need to be performed strictly in the above order to ensure that each component can be correctly placed and fixed.

[0015] Working principle: During on-site construction, after the cable-controlled intelligent stratified oil production process is completed, first connect the sealing mechanism to the eccentric wellhead, reserve the cable in the sealing mechanism, put the copper ball into the groove of the sealing mechanism, put the copper ball in, tighten the pressure cap, squeeze the copper ball, thereby compressing the cable, and finally cover the sealing cover to achieve sealing.

[0016] The present invention provides a device design for sealing the wellhead cable of an intelligent layered oil production well. It has the following beneficial effects: 1. The present invention does not occupy the casing gate and does not affect the normal production of the oil well.

[0017] 2. The sealing device of the present invention allows the cable to pass vertically, greatly reducing the probability of cable damage when it is led out from the casing gate during the completion of the intelligent production well.

[0018] 3. The sealing device of the present invention is designed with a side test channel. Compared with the original casing gate test channel, the volume of the instrument connection joint is reduced. At the same time, the device is located above the wellhead, which can reduce the labor intensity of workers and is not prone to collision. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic structural diagram of a wellhead cable sealing device of the present invention; Among them, 1. sealing cover; 2. pressure cap; 3. copper ball; 4. sealing mechanism; 5. port cover; 6. port sealing ring; 7. groove; 8. cavity. Implementation

[0020] The following will be combined with the drawings in the specification of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. 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. Example

[0021] Please see attached Figure 1 An embodiment of the present invention provides a device for sealing the wellhead cable of an intelligent stratified oil production well, including a sealing mechanism 4, which is used to be connected to the wellhead and ensure the sealing of the cable entering the wellhead; a through hole is opened on the top of the sealing mechanism 4 for the reserved cable connector to pass through; a cavity 8 is opened in the middle of the sealing mechanism 4 for accommodating the cable, and the cavity 8 is "T"-shaped.

[0022] The pressing cap 2 fixes the cable in the sealing mechanism 4 by applying uniform force; the inner wall of the top of the sealing mechanism 4 is provided with an internal thread, and the outer wall of the pressing cap 2 is provided with an external thread, and the pressing cap 2 is threadedly connected to the top of the sealing mechanism 4.

[0023] The copper ball 3 is used to increase the uniform pressure on the cable when the pressure cap 2 is tightened, so as to ensure the cable is fastened and prevent the entry of foreign substances; a groove 7 matching the size of the copper ball 3 is opened in the middle of the sealing mechanism 4, and the copper ball 3 is placed in the groove 7.

[0024] The sealing gland 1 is used to ensure the sealing and protection of the entire system to prevent external liquids, impurities or solid particles from entering the sealing device; the outer wall of the port of the sealing mechanism 4 is provided with an external thread, and the inner wall of the sealing gland 1 is provided with an internal thread, and the sealing gland 1 is threadedly connected to the top of the sealing mechanism 4 through the internal thread.

[0025] The port gland 5 is used to cover and protect the port of the sealing mechanism 4 to prevent foreign matter from entering the sealing device; The port sealing ring 6 is located inside the port gland 5 and is used to provide additional sealing.

[0026] The device can solve the problem of fixing and sealing the pre-installed joint of the wellhead cable, and can also provide a test channel. The device can seal the cable core wire head reserved outside the wellhead after the well is completed. The sealing head fixes and seals the cable head by pressing the copper ball 3 with the pressure cap 2. Each time the test is adjusted, the pressure cap 2 is unscrewed, and the instrument is connected to the core wire head. After the test is completed, the pressure cap 2 is tightened again to protect the cable head from damage. It can be reused many times. The device is small in size and placed above the wellhead, which does not affect the daily maintenance of the wellhead by the workers on the well. At the same time, the joint is designed with a standard buckle-type side channel, which can meet various test operations.

[0027] A method for using a device for sealing a wellhead cable of an intelligent stratified oil production well comprises the following steps, and the installation steps need to be performed strictly in the following order to ensure that each component can be correctly placed and fixed.

[0028] Step 1: Connect the sealing device to the wellhead, connect the sealing mechanism 4 of the sealing device to the wellhead of the intelligent stratified oil production well, ensure that the bottom of the sealing mechanism is aligned with the wellhead and connected tightly, and ensure that there is no gap; Step 2: reserve the cable, reserve enough space in the sealing groove of the sealing mechanism 4 to accommodate the cable, and ensure that the cable is in close contact with the sealing mechanism 4 to prevent the entry of liquid and impurities; Step 3: insert the copper ball 3 and carefully place the copper ball 3 into the groove of the sealing mechanism 4. The main function of the copper ball 3 is to provide uniform force when pressing the cable and ensure that the cable is firmly fixed in the sealing mechanism 4; Step 4: Tighten the pressure cap 2 so that it fits tightly with the sealing mechanism 4 and firmly fixes the cable in the sealing mechanism 4. By tightening the pressure cap 2, the copper ball 3 is compressed to increase the pressure on the cable to ensure the tightness and sealing of the cable. Step five, install the sealing gland 1. After completing the cable fixation and compression, install the sealing gland 1 on top of the pressure cap 2 and tighten it. The main function of the sealing gland 1 is to ensure the sealing and protection of the entire system; when tightening the pressure cap 2 and the sealing gland 1, do not over-tighten to avoid damaging the cable or the sealing device.

[0029] Step 6: Install the port seal ring 6. Install the port seal ring 6 on the side port of the sealing mechanism 4. The function of the port seal ring 6 is to provide additional sealing to prevent liquid, gas or impurities from penetrating into the device through the connection and increase the sealing effect. Step 7: Install the port gland 5, install the port gland 5 on the port of the sealing mechanism 4, and tighten it. The port gland 5 is used to cover and protect the connection to further ensure the sealing and maintain the safety of the wellhead equipment.

[0030] After all components have been installed, a leak check is required. This can be done using a test liquid or other suitable method to ensure that the seals are leak-free.

[0031] After the well is completed in the intelligent stratified oil production process, the downhole cable is led out from the eccentric channel of the wellhead, and the cable core wire head of appropriate length is cut after passing through the wellhead sealing mechanism. The cable is compressed by using the copper ball 3 and the pressure cap 2, and the sealing pressure cap 1 is screwed on to effectively protect the cable and prevent the cable from corrosion and damage.

[0032] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for sealing the wellhead cable of an intelligent stratified oil production well, characterized in that: It includes a sealing mechanism (4) for connecting to the wellhead and ensuring the sealing of the cable entering the wellhead; A pressure cap (2) which secures the cable in the sealing mechanism (4) by applying a uniform force; The copper ball (3) is used to increase the uniform pressure on the cable when the pressure cap (2) is tightened, so as to ensure that the cable is fastened and prevent the entry of foreign matter; A sealing gland (1) is used to ensure the sealing and protection of the entire system and prevent external liquids, impurities or solid particles from entering the sealing device; The port gland (5) is used to cover and protect the port of the sealing mechanism (4) to prevent foreign matter from entering the sealing device; The port sealing ring (6) is located inside the port gland (5) to provide additional sealing.

2. The device for sealing the wellhead cable of an intelligent stratified oil production well according to claim 1, characterized in that: A through hole is provided on the top of the sealing mechanism (4) for a reserved cable connector to pass through.

3. The device for sealing the wellhead cable of an intelligent stratified oil production well according to claim 1, characterized in that: The outer wall of the port of the sealing mechanism (4) is provided with an external thread, the inner wall of the sealing gland (1) is provided with an internal thread, and the sealing gland (1) is threadedly connected to the top of the sealing mechanism (4) via the internal thread.

4. The device for sealing the wellhead cable of an intelligent stratified oil production well according to claim 1, characterized in that: A groove (7) matching the size of the copper ball (3) is provided in the middle of the sealing mechanism (4), and the copper ball (3) is placed in the groove (7).

5. The device for sealing the wellhead cable of an intelligent stratified oil production well according to claim 1, characterized in that: The inner side wall of the top of the sealing mechanism (4) is provided with an internal thread, the outer side wall of the pressing cap (2) is provided with an external thread, and the pressing cap (2) is threadedly connected to the top of the sealing mechanism (4).

6. The device for sealing the wellhead cable of an intelligent stratified oil production well according to claim 1, characterized in that: A cavity (8) is provided in the middle of the sealing mechanism (4) for accommodating the cable, and the cavity (8) is in a "T" shape.

7. A method for using a device for sealing a wellhead cable in an intelligent stratified oil production well, characterized in that: The device for sealing the wellhead cable of an intelligent stratified oil production well according to any one of claims 1 to 6 comprises the following steps: Step 1, connecting the sealing device to the wellhead, and connecting the sealing mechanism (4) of the sealing device to the wellhead of the intelligent stratified oil production well; Step 2: reserve a cable and reserve enough space in the sealing groove of the sealing mechanism (4) to accommodate the cable; Step 3: insert the copper ball (3) and carefully place the copper ball (3) into the groove of the sealing mechanism (4); Step 4: tighten the pressure cap (2) so that it fits tightly with the sealing mechanism (4); Step 5: Install the sealing gland (1). After the cable is fixed and compressed, install the sealing gland (1) on top of the pressure cap (2) and tighten it. Step 6: Install the port sealing ring (6), and install the port sealing ring (6) on the side port of the sealing mechanism (4); Step 7: Install the port gland (5). Install the port gland (5) on the port of the sealing mechanism (4) and tighten it.

8. The method for using the device for sealing the wellhead cable of an intelligent stratified oil production well according to claim 7, characterized in that: When tightening the gland (2) and the gland (1), do not over-tighten to avoid damaging the cable or the seal.

9. The method for using the device for sealing the wellhead cable of an intelligent stratified oil production well according to claim 7, characterized in that: After all components have been installed, a leak check is required.

10. The method for using the device for sealing the wellhead cable of an intelligent stratified oil production well according to claim 7, characterized in that: The installation steps need to be performed in strict accordance with the above order to ensure that each component can be properly placed and fixed.

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