Cable blowout preventer for well logging

Abstract

The utility model discloses a cable blowout preventer for well logging, which comprises a wellhead crossover flange, a pumping tee joint, a blowout preventer, a blowout prevention pipe and a grease injection sealing control head which are sequentially connected from bottom to top, and further comprises an oil injection blowout prevention joint which is arranged between the blowout prevention pipe and the grease injection sealing control head. A cavity is formed in the oil injection blowout prevention connector, and sealing oil is arranged in the cavity. The grease injection blowout prevention connector is arranged, an isolation area is formed between rising gas and the packing in the grease injection sealing control head, the gas can be prevented from making direct contact with the packing, therefore, the packing can be prevented from being corroded by corrosive gas, the working performance and the service life of the packing can be guaranteed, and the device is compact in overall structure and stable in connection.

Description

Technical Field

[0001] The utility model relates to the technical field of oilfield mining equipment, in particular to a cable blowout prevention device for well logging. Background Art

[0002] The cable blowout prevention device is used to provide a buffer zone and a transition zone for the instrument to pass through when the cable is lowered into the well in the oil field. It can seal the wellhead when the cable is in a static and dynamic state during the operation, or close the wellhead when there is overflow and uncontrollable or other unexpected situations during the operation to prevent the occurrence of blowout accidents. However, for oil wells containing corrosive gases, after the oil well gate is opened, gas will be pushed upward to form a gas blockage, blocking the packing and making it impossible to lower the cable. Usually, a weighted pipe is added to allow the cable to continue to be lowered, but the gas contains corrosive gases such as carbon dioxide, which will corrode the packing and make the sealing effect of the device worse.

[0003] Publication (announcement) number: CN114482905B, discloses a blowout prevention technology for sealed external cable oil pipes used in the construction of oil and water wells and oil and gas wells, specifically relates to a blowout prevention device for sealed external cable oil pipes, a static seal pressure operation blowout prevention system and a pressure construction operation method. It solves the technical problem that the prior art cannot effectively seal the external cable and the oil pipe at the same time, and cannot meet the blowout prevention sealing requirements of the pressure-enclosed lifting and lowering of the external cable pipe column. The device includes a primary sealing assembly, a grease injection connection plate and a secondary sealing assembly; the primary sealing assembly and the secondary sealing assembly both include a shell, an annular piston, a variable pressure plate, a rubber sleeve, a hook, a pin, a return spring, and an annular U-mouth pressure plate; the shell is fixedly connected to the grease injection connection plate, and the annular piston axially pushes the variable pressure plate to squeeze the rubber sleeve, and the rubber sleeve deforms and hugs the oil pipe and cable, thereby sealing the oil pipe and cable at the same time. The invention also provides a blowout prevention system formed by combining the blowout prevention device and a pressure operation blowout prevention method based on the blowout prevention system.

[0004] The prior art has the technical problems that after the oil well gate is opened, gas will be pushed out upward to form gas blockage, blocking the packing so that the cable cannot be lowered, and corroding the packing, which deteriorates the sealing effect of the device.

[0005] Publication (announcement) number: CN114458219B, discloses an electric submersible pump cable wellhead crossing device and a crossing method for 370℃ thermal recovery wells, wherein the head end of the cable / hydraulic control pipeline hanger is connected to the lifting short section, the tail end of the cable / hydraulic control pipeline hanger is connected to the head end of the insulated oil pipe, the cable / hydraulic control pipeline hanger is seated at the wellhead, the tail end of the high-temperature power cable passes through the cable / hydraulic control pipeline hanger and is fixed to the outer wall of the insulated oil pipe through a reverse coupling shield, the head end of the high-temperature power cable is located on the upper surface of the cable / hydraulic control pipeline hanger, the tail end of the insulated oil pipe extends into the oil pipe head, a through hole is opened on the side wall of the oil pipe head and passes through the side wall of the oil pipe head, and a tee of the oil pipe head is installed at the through hole to form a cable crossing channel. By passing the cable through the side of the tubing head, the high-temperature area of ​​the wellhead tubing hanger and the flange under the oil tree during steam injection is avoided, so that the high-temperature power cable with a temperature resistance of 250°C can be used in high-temperature heavy oil thermal recovery wells with a temperature of 370°C.

[0006] The prior art has the technical problems that after the oil well gate is opened, gas will be pushed out upward to form gas blockage, blocking the packing so that the cable cannot be lowered, and corroding the packing, which deteriorates the sealing effect of the device.

[0007] Publication (Announcement) No.: CN204804750U, discloses a cable blowout prevention device, including cable slips, hydraulically controlled three-gate cable blowout preventer, hydraulically controlled lower catcher, blowout prevention joint, blowout prevention pipe, hydraulically controlled upper catcher, and grease injection sealing head, wherein the cable slips are fixed on the lower side of the hydraulically controlled three-gate cable blowout preventer, the hydraulically controlled lower catcher is fixed on the upper side of the hydraulically controlled three-gate cable blowout preventer, the blowout prevention joint is fixed on the upper side of the hydraulically controlled lower catcher, the blowout prevention pipe is fixed on the upper side of the blowout prevention joint, the hydraulically controlled upper catcher is fixed on the upper side of the blowout prevention pipe, and the grease injection sealing head is fixed on the upper side of the hydraulically controlled upper catcher. The structural design is simple and reasonable, and can accurately determine the designated position of the cable; it can remind operators, wellhead workers, etc. to pay attention to safe operation, avoid failures, and prevent underground accidents.

[0008] The prior art has the technical problems that after the oil well gate is opened, gas will be pushed out upward to form gas blockage, blocking the packing so that the cable cannot be lowered, and corroding the packing, which deteriorates the sealing effect of the device.

[0009] In short, the technical solutions of the above-disclosed technologies, the technical problems to be solved and the beneficial effects produced are all different from the present utility model. Regarding more technical features, technical problems to be solved and the beneficial effects of the present utility model, there is no technical inspiration in the above-disclosed technical documents. Summary of the invention

[0010] In view of the above-mentioned defects in the prior art, the purpose of the utility model is to provide a cable blowout preventer for logging, which can avoid direct contact between the rising gas and the packing, prevent the packing from being corroded and affect the use of the device.

[0011] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0012] A cable blowout prevention device for well logging comprises a blowout prevention pipe and a grease-injected sealed control head, wherein a gas isolation device is arranged between the blowout prevention pipe and the grease-injected sealed control head.

[0013] Further, the gas isolation device includes an oil injection anti-blowout joint;

[0014] Specifically, a cavity is provided in the oil injection and anti-blowout joint, and the oil injection and anti-blowout joint is provided with an upper joint and a lower joint, and the cavity is provided below the upper joint;

[0015] Specifically, the upper joint is connected to the lower end of the grease injection sealing control head, and the lower joint is connected to the upper end of the blowout preventer;

[0016] Specifically, sealing oil is arranged in the cavity; an oil filling port is arranged on the cavity wall of the cavity;

[0017] Specifically, a cable through hole is provided at the lower end of the cavity so that the cable can pass through the oil injection and anti-blowout joint.

[0018] Further, the refueling port is a countersunk threaded hole, connecting the cavity with the outside;

[0019] Specifically, sealing oil is filled in the cavity through the countersunk threaded hole, and then a bolt is arranged to close the countersunk threaded hole.

[0020] Further, the gas isolation device also includes an extruded wire plug;

[0021] Specifically, a countersunk hole is provided at the lower end of the cable through hole of the oil injection anti-spray joint, the aperture of the countersunk hole is larger than the cable through hole, and the upper end of the extruded wire plug is connected to the lower end of the countersunk hole;

[0022] Specifically, a through hole is provided in the extruded wire plug so that the cable can pass through;

[0023] Specifically, a second cavity is formed between the top surface of the extruded wire plug and the inner top surface of the counterbore.

[0024] Furthermore, the sealing oil is aviation white oil.

[0025] Further, the lower end of the lubricant preventer is connected to a blowout preventer;

[0026] Specifically, the lower end of the blowout preventer is connected to a pump-in tee;

[0027] Specifically, the lower end of the pump-in tee is connected to the wellhead conversion flange.

[0028] Furthermore, a quick pressure test joint assembly and a hydraulically controlled lower catcher are provided between the blowout preventer and the blowout preventer; the quick pressure test joint assembly is below the hydraulically controlled lower catcher.

[0029] Furthermore, a stopcock is provided on the pump-in tee.

[0030] Furthermore, the blowout preventer is a three-gate blowout preventer.

[0031] Furthermore, the lower end of the wellhead conversion flange is connected to the wellhead.

[0032] Compared with the prior art, the utility model has the following beneficial effects:

[0033] The utility model provides an oil injection blowout prevention joint and an extruded wire plug between the blowout prevention pipe and the grease injection sealing control head, and injects aviation white oil into the cavity of the oil injection blowout prevention joint, so that an isolation zone can be formed between the rising gas and the packing in the grease injection sealing control head, and direct contact between the gas and the packing can be avoided, so that corrosion of the packing by corrosive gas can be avoided, and the working performance and service life of the packing can be guaranteed. The overall structure of the device is compact and the connection is stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a structural schematic diagram of a cable blowout prevention device for well logging according to the utility model;

[0035] Figure 2 It is a structural schematic diagram of an oil injection blowout prevention joint of a cable blowout prevention device for well logging according to the utility model;

[0036] Figure 3 It is a structural schematic diagram of an extruded wire plug of a cable blowout prevention device for well logging according to the utility model;

[0037] In the figure: 1. Wellhead conversion flange; 2. Pump-in tee; 3. Blowout preventer; 4. Quick pressure test joint assembly; 5. Hydraulic control lower catcher; 6. Blowout preventer; 7. Oil injection blowout preventer joint; 8. Extrusion wire plug; 9. Grease injection sealing control head; 10. Cavity; 11. Through hole; 12. Countersunk hole. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0039] Embodiment 1:

[0040] Reference Figure 1 to Figure 2 The utility model provides a cable blowout preventer for well logging, comprising a wellhead conversion flange 1, a pump-in tee 2, a blowout preventer 3, a quick pressure test joint assembly 4, a quick pressure test joint assembly 4, a hydraulically controlled lower catcher 5, a blowout preventer 6, and a grease injection sealing control head 9, which are sequentially connected from bottom to top; the lower end of the wellhead conversion flange 1 is connected to the wellhead, and the pump-in tee 2 is provided with a plug valve.

[0041] An oil injection anti-blowout joint 7 is provided between the anti-blowout pipe 6 and the grease injection sealing control head 9 .

[0042] The oil injection anti-spray joint 7 is provided with an upper joint and a lower joint, a cavity 10 is provided below the upper joint, a countersunk threaded hole is provided on the cavity wall of the cavity 10, the cavity 10 is connected with the outside, aviation white oil is filled in the cavity 10 through the countersunk threaded hole, and then bolts are provided to close the countersunk threaded hole. Aviation white oil can fill the gap between the cable and the cavity 10, and can separate corrosive gas from the packing to prevent the packing from corrosion.

[0043] A cable through hole is provided at the lower end of the cavity 10 so that the cable can pass through the oil injection and anti-blowout joint 7.

[0044] Embodiment 2:

[0045] When the cable moves downward, a portion of the aviation white oil will be brought into the lower part of the cavity due to the viscosity of the fluid. Figure 3 , an extrusion wire plug 8 is provided;

[0046] A countersunk hole 12 is provided at the lower end of the cable through hole of the oil-filled anti-blowout joint 7, and the aperture of the countersunk hole 12 is larger than the cable through hole. An internal thread is provided at the lower end of the countersunk hole 12, and an extrusion wire plug 8 is connected to the internal thread. A through hole 11 is provided in the extrusion wire plug 8 so that the cable can pass through. A second cavity is formed between the top surface of the extrusion wire plug 8 and the top surface inside the countersunk hole 12. The second cavity can retain a part of the aviation white oil brought into the bottom of the cavity, so that the work can continue, thereby reducing waste, extending the refueling time, and reducing the workload of workers.

[0047] It should be noted that the wellhead conversion flange 1 is used to connect the cable blowout preventer to the wellhead, which belongs to the prior art. For example, the upper end is a union-connected pump inlet tee 2, and the lower end is a flange connected to the wellhead. Those skilled in the art are clear about this.

[0048] The pumping tee 2 belongs to the prior art. For example, the pumping tee disclosed in CN210033359U, a lower catcher and a blowout preventer including a lower catcher, comprises a tee body, a lower union, a pressure gauge and a plug valve, which is used for a pump truck to pump liquid into the well through a fracturing pipeline or a water hose to wash the well or to inject water into the blowout preventer 6 for pressure self-test, or to discharge the remaining liquid in the blowout preventer 6 after the wellhead gate is closed and the blowout preventer 6 is depressurized. The plug valve is used to seal the wellhead after water injection and pressurization or pumping liquid into the well to disassemble the water hose, and can also be used to discharge the pressurized liquid in the well or the blowout preventer 6 through the water hose; it is used to seal the wellhead when the grease injection sealing control head 9 cannot be effectively sealed during operation or when the cable outer armor steel wire breaks and causes a bird's nest at the lower part of the grease injection sealing control head 9; those skilled in the art are clear about this.

[0049] The blowout preventer 3 uses a three-gate blowout preventer, which is a prior art and can be a CN206290235U coiled tubing four-gate blowout preventer. After deleting the shear gate, it has the form of a full-closed gate, a hanging gate, and a semi-closed gate, which is clear to those skilled in the art.

[0050] The quick pressure test joint assembly 4 belongs to the prior art. For example, CN210033359U discloses a lower catcher and a blowout preventer including a lower catcher, wherein the quick pressure test assembly includes an upper and lower joint body, a union nut and a pressure measuring valve assembly. When a problem is found after the instrument is lowered into the well and the wellhead needs to be repaired or the blowout preventer 6 needs to be disassembled when the perforating gun is replaced during segmented perforating operations, it is disassembled from the union connection of the quick pressure test joint assembly 4. When the perforating gun and the bridge plug are replaced or the blowout preventer 6 is connected to the inlet again after the instrument is repaired, it is also connected from here. After the connection is completed, only a small amount of hydraulic oil needs to be injected into the middle of the two sealing rings at the union connection of the quick pressure test joint assembly 4 with a hand pump to reach the well pressure, so as to quickly test whether the connection and sealing are reliable. Those skilled in the art are clear about this.

[0051] The hydraulically controlled lower catcher 5 belongs to the prior art. For example, CN210033359U discloses a lower catcher and a blowout prevention device including the lower catcher. The hydraulically controlled lower catcher is provided with a discharge nozzle and a pressure gauge is installed on the discharge nozzle. When the downhole tool string is lifted up and the horizontal blocking fork in the hydraulically controlled lower catcher 5 is knocked open to enter the blowout prevention pipe 6, the blocking fork automatically resets to a horizontal state, blocking the tool string in the blowout prevention pipe 6 to prevent it from accidentally falling into the well. When the tool string is lowered into the well, the blocking fork is erected by hydraulic control to allow the tool string to pass. The discharge nozzle is used to release the residual pressure in the blowout prevention pipe 6 after the tool string is lifted from the well into the blowout prevention pipe 6 and the wellhead valve is closed, so as to disassemble the cable blowout prevention device. Those skilled in the art are clear about this.

[0052] The lubricant preventer 6 belongs to the prior art, such as the CN102337850B titanium alloy lubricant preventer, which includes an upper joint, a pipe body, a union joint and a union nut, and provides a pressure buffer zone for the tool string going down the well and a transition zone for the instrument to pass through. According to needs, multiple lubricant preventers 6 can be selected for serial combination and use, and technical personnel in this field are clear about this.

[0053] The grease injection sealing control head 9 belongs to the prior art, such as CN216381301U, a steel wire grease injection sealing control device, which realizes static and dynamic sealing of the cable wellhead by injecting high-pressure and high-viscosity sealing grease. The device comprises a main body, and a grease injection port and a grease return port are provided on the main body. A plurality of choke tubes suitable for the pressure conditions in the well are installed in the main body, and the device also comprises a blowout preventer box and a cable scraper. The blowout preventer box and the cable scraper each have a section of rubber packing. The rubber packing is compressed by the piston in the hydraulically controlled blowout preventer box to hold the cable tightly, which plays the role of dynamic auxiliary seal and static main seal and scrapes off the sealing grease on the upward cable. The lower end of the grease injection sealing control head 9 is directly connected to the oil injection blowout preventer joint 7 by a non-ferrous connection joint, on which a safety choke ball valve is provided. Once the cable is accidentally pulled off or broken from the cable head, the safety choke ball valve blocks the cable hole under the action of high-pressure liquid flow or air flow to automatically choke and seal the wellhead. Those skilled in the art are clear about this.

[0054] It needs to be explained again that 1. wellhead conversion flange; 2. pump-in tee; 3. blowout preventer; 4. quick pressure test joint assembly; 5. hydraulically controlled lower catcher; 6. blowout preventer; 9. grease-injected sealing control head, the above components are all prior art, which may be the prior art given in this embodiment or other prior art, and those skilled in the art are clear about this.

[0055] All components and connection methods of components not discussed in this application belong to the known technologies in this technical field and can be directly applied without further explanation.

[0056] In the present invention, the term "plurality" means two or more than two, unless otherwise clearly defined. The terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0057] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by terms such as "up", "down", "left", "right", "front" and "back" are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation, and therefore, cannot be understood as a limitation on the present invention.

[0058] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", 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 utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0059] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A cable blowout prevention device for logging, comprising a blowout prevention pipe, a grease-injected sealing control head, It is characterized in that A gas isolation device is provided between the blowout preventer and the grease injection seal control head; The gas isolation device includes an oil injection anti-blowout joint; A cavity is provided in the oil injection and anti-blowout joint, and the oil injection and anti-blowout joint is provided with an upper joint and a lower joint, and the cavity is provided below the upper joint; The upper joint is connected to the lower end of the grease injection seal control head, and the lower joint is connected to the upper end of the blowout preventer; Sealing oil is arranged in the cavity; an oil filling port is arranged on the cavity wall of the cavity; A cable through hole is arranged at the lower end of the cavity so that the cable can pass through the oil injection anti-blowout joint.

2. A cable blowout prevention device for well logging according to claim 1, characterized in that: The refueling port is a countersunk threaded hole that connects the cavity with the outside world; The cavity is filled with sealing oil through the countersunk threaded hole, and then a bolt is set to close the countersunk threaded hole.

3. A cable blowout prevention device for logging according to claim 1, characterized in that: The gas isolation device also includes an extruded wire plug; A countersunk hole is provided at the lower end of the cable through hole of the oil injection anti-spray joint, the diameter of the countersunk hole is larger than the cable through hole, and the upper end of the extruded wire plug is connected to the lower end of the countersunk hole; A through hole is provided in the extruded wire plug so that the cable can pass through; A second cavity is formed between the top surface of the extruded wire plug and the inner top surface of the countersunk hole.

4. A cable blowout prevention device for well logging according to any one of claims 1 to 3, characterized in that: The sealing oil is aviation white oil.

5. A cable blowout prevention device for logging according to claim 1, characterized in that: The lower end of the blowout preventer is connected to the blowout preventer; The lower end of the blowout preventer is connected to a pump-in tee; The lower end of the pump-in tee is connected to the wellhead conversion flange.

6. A cable blowout prevention device for well logging according to claim 5, characterized in that: A quick pressure test joint assembly and a hydraulically controlled lower catcher are also provided between the blowout preventer and the blowout preventer; the quick pressure test joint assembly is below the hydraulically controlled lower catcher.

7. A cable blowout prevention device for well logging according to claim 5, characterized in that: A stopcock is arranged on the pump inlet tee.

8. A cable blowout prevention device for well logging according to claim 5, characterized in that: The blowout preventer is a three-gate blowout preventer.

9. A cable blowout prevention device for well logging according to claim 5, characterized in that: The lower end of the wellhead conversion flange is connected to the wellhead.

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