Water injection well Christmas tree cable penetrating flange connecting device

Abstract

The utility model relates to the technical field of oil field cable connecting devices, in particular to a water injection well Christmas tree cable penetrating flange connecting device which comprises a connecting flange used for being connected between a wellhead oil extraction four-way flange and a gate. The cable penetrating component comprises an upper short circuit, a temporary valve and a lower short circuit, the upper short circuit, the temporary valve and the lower short circuit are sequentially and fixedly installed from top to bottom, a sealing gland is installed at the upper end of the upper short circuit in a sealing mode, a first limiting boss is arranged in the lower portion of the lower short circuit, and a first-stage sealing cavity is formed in the portion, above the first limiting boss, in the lower short circuit. On the premise that the technological process of a water injection wellhead is not changed, the signal transmission cable is connected, and the pressure in the well is sealed, so that the signal transmission cable does not need to penetrate through a wellhead sleeve gate and a test gate, control of the gate on the pressure in the well is not hindered, and the problem that the signal transmission cable is cut off or damaged due to misoperation of the gate is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of oil field cable connection devices, in particular to a water injection well Christmas tree cable through flange connection device. Background Art

[0002] The deep heavy oil in Jimusarji 7 well area is mined by cold water injection. In order to achieve fine water injection, two methods, intelligent sub-injection and downhole pressurized water injection, are used for water injection. At present, both water injection methods require the signal transmission cable to be connected to the downhole intelligent water distributor. The signal transmission cable needs to pass through the wellhead casing gate (or main gate) and the test gate to connect to the ground control device to achieve remote control of the size of the downhole water nozzle and achieve the purpose of fine water injection. When the signal transmission cable passes through the wellhead casing gate (or main gate) and the test gate, the gate will lose control of the pressure in the well; in addition, when the operator misoperates the gate, there is a risk of cutting or damaging the signal transmission cable. At the same time, the signal transmission cable is connected and installed outside the wellhead insulation box of the wellhead sealing device. In winter, at -20℃ to -30℃, there is a risk of freezing and cracking the cable connection sealing device, and the wellhead loses control, causing oil to overflow and pollute the environment. At the same time, the overflowed high-pressure oil and other pressures pose a safety hazard to the staff. Summary of the invention

[0003] The utility model provides a water injection well Christmas tree cable through the flange connection device, which overcomes the shortcomings of the above-mentioned prior art. The signal transmission cable does not need to pass through the wellhead casing gate and the test gate, thereby not hindering the gates (i.e. the wellhead casing gate and the test gate) from controlling the pressure in the well.

[0004] The technical scheme of the utility model is realized through the following measures: a cable crossing flange connection device for an oil production tree in a water injection well, comprising a connection flange for connecting between a wellhead oil production four-way flange and a gate, a cable crossing component fixedly connected in the middle of the connection flange, the cable crossing component comprising an upper short-circuit, a temporary valve and a lower short-circuit, the upper short-circuit, the temporary valve and the lower short-circuit are fixedly installed in sequence from top to bottom, a sealing gland is sealedly installed at the upper end of the upper short-circuit, a first limiting boss is arranged in the lower part of the lower short-circuit, a primary sealing chamber is formed inside the lower short-circuit above the first limiting boss, a second limiting boss is arranged in the lower part of the upper short-circuit, a secondary sealing chamber is formed inside the upper short-circuit above the second limiting boss, and sealing components are fixedly installed in both the primary sealing chamber and the secondary sealing chamber.

[0005] The following are further optimizations and / or improvements to the above utility model technical solution:

[0006] The above-mentioned connecting flange may include a flange body, with a left flange and a right flange respectively fixed at the left end and the right end of the flange body, an intermediate flange fixed on the flange body between the left flange and the right flange, a mounting groove is provided at the intermediate flange, a lower short-circuit is fixed at the mounting groove, and a cable inlet for connecting the lower short-circuit with the inside of the flange body is provided at the flange body corresponding to the mounting groove.

[0007] The sealing gland may be provided with a cable outlet.

[0008] The lower end of the upper short-circuit and the upper end of the temporary valve can be fixedly connected by welding.

[0009] The sealing gland and the upper end of the upper short-circuit can be fixedly connected by threads, the lower end of the upper short-circuit and the upper end of the temporary valve can be fixedly connected by threads, and the lower end of the temporary valve and the upper end of the lower short-circuit can be fixedly connected by threads.

[0010] At least one sealing ring may be provided between the sealing gland and the upper end of the upper short-circuit, at least one sealing ring may be provided between the lower end of the upper short-circuit and the upper end of the temporary valve, and at least one sealing ring may be provided between the lower end of the temporary valve and the upper end of the lower short-circuit.

[0011] The sealing member may include at least one sealing ring, and the sealing ring is a metal sealing ring.

[0012] The utility model connects the signal transmission cable and seals the pressure in the well without changing the process flow of the water injection wellhead, so that the signal transmission cable does not need to pass through the wellhead casing gate and the test gate, thereby not hindering the gates (i.e., the wellhead casing gate and the test gate) from controlling the pressure in the wellhead, and eliminating the problem of the signal transmission cable being cut or damaged due to misoperation of the gates. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Attached Figure 1 It is a schematic diagram of the main partial cross-sectional structure of the utility model.

[0014] The codes in the accompanying drawings are: 1 for upper short circuit, 2 for temporary valve, 3 for lower short circuit, 4 for sealing cover, 5 for, 6 for the first limiting boss, 7 for the primary sealing chamber, 8 for the second limiting boss, 9 for the secondary sealing chamber, 10 for sealing, 11 for flange body, 12 for left flange, 13 for right flange, 14 for middle flange, and 15 for cable inlet. DETAILED DESCRIPTION

[0015] The present invention is not limited by the following embodiments, and specific implementation methods can be determined according to the technical solution of the present invention and actual conditions.

[0016] In the present invention, for the convenience of description, the relative position relationship of each component is described according to the attached manual. Figure 1The layout is described in detail, such as the positional relationship of front, back, top, bottom, left, right, etc., which is based on the attached manual. Figure 1 It is determined by the layout direction.

[0017] In the utility model, the cable is a signal transmission cable or other cables.

[0018] The present invention is further described below in conjunction with the embodiments and drawings:

[0019] Embodiment 1: As attached Figure 1 As shown, the cable crossing flange connection device of the oil production tree of the water injection well includes a connecting flange for connecting between the wellhead oil production four-way flange and the gate, a cable crossing component is fixedly connected in the middle of the connecting flange, and the cable crossing component includes an upper short-circuit 1, a temporary valve 2 and a lower short-circuit 3, the upper short-circuit 1, the temporary valve 2 and the lower short-circuit 3 are fixedly installed in sequence from top to bottom, a sealing gland 4 is sealedly installed at the upper end of the upper short-circuit 1, a first limiting boss 6 is arranged in the lower part of the lower short-circuit 3, a primary sealing chamber 7 is formed in the lower short-circuit 3 above the first limiting boss 6, a second limiting boss 8 is arranged in the lower part of the upper short-circuit 1, a secondary sealing chamber 9 is formed in the upper short-circuit 1 above the second limiting boss 8, and a sealing member 10 is fixedly installed in both the primary sealing chamber 7 and the secondary sealing chamber 9.

[0020] Without changing the process flow of the water injection wellhead, the device connects the signal transmission cable and seals the pressure in the well, so that the signal transmission cable does not need to pass through the wellhead casing gate and the test gate, thereby not hindering the control of the wellhead pressure by the gates (i.e., the wellhead casing gate and the test gate), and eliminating the problem of the signal transmission cable being cut or damaged due to misoperation of the gates.

[0021] The device is installed between the wellhead oil production four-way flange and the wellhead casing gate.

[0022] When the seals 10 in the primary sealing chamber 7 and the secondary sealing chamber 9 fail, the seals 10 can be replaced online. The temporary valve 2 can be a conventional sealing valve.

[0023] The utility model is suitable for the scene where there is a cable in the oil field well that needs to be connected and installed with the ground equipment. Through the two-stage seal and the temporary valve 2 seal combination, the pressure in the well is effectively controlled. At the same time, the device is safe, reliable and easy to install.

[0024] Currently, intelligent injection and downhole pressurized water injection have become the dominant methods in China. According to incomplete statistics, there are 18,000 water injection wells in China. With the optimization of water injection methods, intelligent injection and downhole pressurized water injection will be fully promoted and applied, giving the utility model broad market application prospects.

[0025] In winter, when temperatures are low, the signal transmission cable can utilize the heat inside the gate to keep warm, eliminating the risk of freezing and cracking.

[0026] Handles 5 can be provided on the left and right sides of the temporary valve 2 .

[0027] According to actual needs, the above-mentioned water injection well Christmas tree cable through flange connection device can be further optimized and / or improved:

[0028] Embodiment 2: As an optimization of the above embodiment, as shown in the attached Figure 1 As shown, the connecting flange includes a flange body 11, a left flange 12 and a right flange 13 are respectively fixed at the left and right ends of the flange body 11, an intermediate flange 14 is fixed on the flange body 11 between the left flange 12 and the right flange 13, a mounting groove is provided at the intermediate flange 14, the lower short-circuit 3 is fixed at the mounting groove, and a cable introduction port 15 for connecting the lower short-circuit 3 with the inside of the flange body 11 is provided at the flange body 11 corresponding to the mounting groove.

[0029] The left flange 12 of the connecting flange is connected to the wellhead oil production four-way flange, and the right flange 13 is connected to the wellhead casing gate.

[0030] Embodiment 3: As an optimization of the above embodiment, the sealing gland 4 is provided with a cable outlet as required.

[0031] The signal transmission cable can be connected to the ground equipment through the cable outlet.

[0032] Embodiment 4: As an optimization of the above embodiment, as needed, the lower end of the upper short-circuit 1 and the upper end of the temporary valve 2 are fixedly connected by welding.

[0033] Example 5: The difference from Example 4 is that the sealing cover 4 is fixedly connected to the upper end of the upper short-circuit 1 by means of threads, the lower end of the upper short-circuit 1 is fixedly connected to the upper end of the temporary valve 2 by means of threads, and the lower end of the temporary valve 2 is fixedly connected to the upper end of the lower short-circuit 3 by means of threads.

[0034] The device can select a connection method according to actual needs, such as welding or threaded connection.

[0035] Embodiment 6: As an optimization of the above-mentioned embodiment 5, when the various structures of the cable crossing component are connected by threads, in order to further improve the sealing performance, at least one sealing ring is provided between the sealing cover 4 and the upper end of the upper short-circuit 1, at least one sealing ring is provided between the lower end of the upper short-circuit 1 and the upper end of the temporary valve 2, and at least one sealing ring is provided between the lower end of the temporary valve 2 and the upper end of the lower short-circuit 3.

[0036] Embodiment 7: As an optimization of the above embodiment, the sealing member 10 includes at least one sealing ring, and the sealing ring is a metal sealing ring.

[0037] The above technical features constitute the best implementation example of the present utility model, which has strong adaptability and best implementation effect. Non-essential technical features can be added or removed according to actual needs to meet the requirements of different situations.

[0038] The use process of the best embodiment of the utility model: When the utility model is used, the left side of the connecting flange is connected to the wellhead oil production four-way flange, and the other side is connected to the gate (the gate is a wellhead casing gate), the downhole cable enters the connecting flange from the left side, and then passes through the cable introduction port 15 to the primary sealing chamber 7, and then passes through the temporary valve 2 and the secondary sealing chamber 9, and the cable is sealed by the sealing member 10 in the primary sealing chamber 7 and the secondary sealing chamber 9. When the sealing member 10 of the secondary sealing chamber 9 fails, close the temporary valve 2, seal the pressure in the well, remove the cable sealing gland 4, replace the sealing member 10 in the secondary sealing chamber 9, tighten the sealing gland 4, and resume normal production.

Claims

1. A cable through flange connection device for a water injection well Christmas tree, characterized in that It comprises a connecting flange for connecting between a wellhead oil production four-way flange and a gate, a cable crossing component is fixedly connected in the middle of the connecting flange, the cable crossing component comprises an upper short-circuit, a temporary valve and a lower short-circuit, the upper short-circuit, the temporary valve and the lower short-circuit are fixedly installed in sequence from top to bottom, a sealing gland is sealed at the upper end of the upper short-circuit, a first limiting boss is arranged in the lower part of the lower short-circuit, a primary sealing chamber is formed in the lower short-circuit above the first limiting boss, a second limiting boss is arranged in the lower part of the upper short-circuit, a secondary sealing chamber is formed in the upper short-circuit above the second limiting boss, and sealing components are fixedly installed in both the primary sealing chamber and the secondary sealing chamber.

2. The cable through flange connection device for a water injection well Christmas tree according to claim 1, characterized in that The connecting flange includes a flange body, a left flange and a right flange are respectively fixed at the left and right ends of the flange body, an intermediate flange is fixed on the flange body between the left flange and the right flange, a mounting groove is arranged at the intermediate flange, a lower short-circuit is fixed at the mounting groove, and a cable inlet for connecting the lower short-circuit with the inside of the flange body is arranged at the flange body corresponding to the mounting groove.

3. The cable passing flange connection device for a water injection well Christmas tree according to claim 1 or 2, characterized in that The sealing gland is provided with a cable outlet.

4. The cable passing flange connection device for a water injection well Christmas tree according to claim 1 or 2, characterized in that The lower end of the upper short-circuit is fixedly connected to the upper end of the temporary valve by welding.

5. The cable passing flange connection device for a water injection well Christmas tree according to claim 3 is characterized in that The lower end of the upper short-circuit is fixedly connected to the upper end of the temporary valve by welding.

6. The cable passing flange connection device for a water injection well Christmas tree according to claim 1 or 2, characterized in that At least one sealing ring is arranged between the sealing gland and the upper end of the upper short-circuit, at least one sealing ring is arranged between the lower end of the upper short-circuit and the upper end of the temporary valve, and at least one sealing ring is arranged between the lower end of the temporary valve and the upper end of the lower short-circuit.

7. The cable passing flange connection device for a water injection well Christmas tree according to claim 3 is characterized in that At least one sealing ring is arranged between the sealing gland and the upper end of the upper short-circuit, at least one sealing ring is arranged between the lower end of the upper short-circuit and the upper end of the temporary valve, and at least one sealing ring is arranged between the lower end of the temporary valve and the upper end of the lower short-circuit.

8. The cable-through-flange connection device for a water injection well Christmas tree according to claim 6, characterized in that The sealing element comprises at least one sealing ring, and the sealing ring is a metal sealing ring.

9. The cable-through-flange connection device for a water injection well Christmas tree according to claim 7, characterized in that The sealing element comprises at least one sealing ring, and the sealing ring is a metal sealing ring.

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