A universal three-type pressure operation device for oilfield rod and pipe

Abstract

A universal Class III pressure operation device for oilfield rods and pipes. The device mainly solves the problems of high construction cost and inability to operate under pressure during the entire process of existing Class III oilfield well pressure operation. The bottom of the movable slip (1) is connected to an upper blowout preventer (2), the bottom of the upper blowout preventer (2) is connected to a telescopic working cylinder (4), the bottom of the telescopic working cylinder (4) is connected to a balanced pressure relief device (8), the bottom of the balanced pressure relief device (8) is connected to a lower blowout preventer (12), the bottom of the lower blowout preventer (12) is connected to a fixed bearing base (9), and the bottom of the fixed bearing base (9) is connected to a three-gate blowout preventer (11). The device can realize pressure operation during the entire process, meet the requirements of environmental protection construction, and has low construction cost and low maintenance cost.

Description

Technical Field

[0001] The invention relates to the field of oilfield oil and water well operations, in particular to a universal three-type pressure operation device for oilfield rods and pipes. Background Art

[0002] At present, the number of wells under pressure in oil fields is increasing year by year, among which wells with wellhead pressure of less than 7MPa account for 80.0%. In terms of the type of pressure operation, this type of well is a Class III well (with the lowest construction difficulty and the lowest safety risk), but the oil field does not have targeted Class III pressure operation equipment. Wells with wellhead pressure of less than 7MPa use 21 / 35MPa or 14 / 21MPa equipment, resulting in over-matching, which not only increases construction costs, maintenance costs, and depreciation costs, but also because the equipment and tools are complex in structure and high in height (about 5m), it takes a long time to transport and install, affecting the construction progress. Another problem is that there is no mature technology for oil well pump rod pressure operation equipment in China, and innovation and iteration are needed, resulting in the inability of oil well pressure operation construction to operate under pressure throughout the entire process, and it also cannot meet the requirements of environmental protection construction. Summary of the invention

[0003] In order to overcome the problems of high construction cost and inability to carry out pressure operation throughout the entire process during existing Class III oilfield well pressure operation, the present invention provides a universal Class III pressure operation device for oilfield rods and pipes, which can realize pressure operation throughout the entire process, meet the requirements of environmentally friendly construction, and has low construction cost and maintenance cost.

[0004] The technical solution of the present invention is: a universal three-type pressure operation device for oilfield rods and pipes, comprising a traveling slip, the bottom of the traveling slip is connected to an upper blowout preventer, the bottom of the upper blowout preventer is connected to a telescopic working cylinder, the bottom of the telescopic working cylinder is connected to a balanced pressure relief device, the bottom of the balanced pressure relief device is connected to a lower blowout preventer, the bottom of the lower blowout preventer is connected to a fixed bearing base, and the bottom of the fixed bearing base is connected to a three-gate blowout preventer.

[0005] The upper part of the fixed bearing base is connected with four fixed bearing cylinders, the upper part of the fixed bearing cylinder is connected with an operating platform, and the operating platform is located between the upper blowout preventer and the telescopic working cylinder, and the bottom of the fixed bearing base is connected with fixed bearing legs.

[0006] The traveling slip comprises a traveling slip shell, a capsule type wax scraping rubber core is arranged inside the traveling slip shell, and the upper part of the capsule type wax scraping rubber core is limited by an elastic retaining ring.

[0007] The upper blowout preventer comprises a blowout preventer shell, a sealing rubber core is arranged inside the blowout preventer shell, the outer side of the blowout preventer shell is connected to a jack shell, and the sealing rubber core is connected to a jack plunger rod.

[0008] A metal support plate is provided inside the sealant core. The metal support plate is L-shaped and is vulcanized inside the sealant core.

[0009] The fixed bearing base comprises a shell, a pressure cover is fixed on one side of the shell, a probe rod is arranged in the pressure cover, a joint is fixed at the front end of the probe rod, a probe wheel is connected to the front end of the joint, and an alarm sensor is connected to the rear end of the probe rod.

[0010] A bearing is provided at the connection between the joint and the probe wheel.

[0011] The three-gate blowout preventer comprises a shell, and the shell is provided with a shear blowout preventer, a tubing blowout preventer and a sucker rod blowout preventer in sequence from top to bottom.

[0012] The tubing blowout preventer comprises a tubing suspension gate and a tubing sealing rubber core. A tubing blowout preventer piston is arranged outside the tubing suspension gate, and a tubing blowout preventer lead screw is connected to the tubing blowout preventer piston.

[0013] The sucker rod blowout preventer comprises a rod suspension gate and a rod sealing rubber core. A rod blowout preventer piston is arranged outside the rod suspension gate, and a rod blowout preventer lead screw is connected to the rod blowout preventer piston.

[0014] The present invention has the following beneficial effects: due to the adoption of the above scheme, the pressure operation device is mainly used for three types of wells, that is, it can be used for oil pipe operation and pumping rod operation. The rod and pipe operation can be sealed, and the whole process of pressure operation construction can be realized, and the construction cost and maintenance cost are low. The problem that the conventional pressure operation rod and pipe move up and down while the annular blowout preventer does not move, thereby wearing the annular blowout preventer rubber core and shortening the working life of the annular blowout preventer rubber core is solved; during the process of pulling out the rod and pipe, the outer wall of the rod and pipe can be cleaned and scraped to avoid environmental pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the present invention;

[0016] Figure 2 It is a schematic diagram of the swimming kava;

[0017] Figure 3 It is a schematic diagram of the upper blowout preventer;

[0018] Figure 4 is a schematic diagram of a telescopic working cylinder;

[0019] Figure 5 is a schematic diagram of a fixed bearing base;

[0020] Figure 6 It is a three-dimensional diagram of a fixed bearing base;

[0021] Figure 7 It is a schematic diagram of the probe wheel in the fixed bearing base;

[0022] Figure 8 is a schematic diagram of the joint in the fixed bearing base;

[0023] Fig. 9 It is a schematic diagram of a three-gate blowout preventer.

[0024] In the figure, 1-traveling slip, 2-upper blowout preventer, 3-operating platform, 4-telescopic working cylinder, 5-hydraulic cylinder, 6-pipe valve, 7-fixed bearing cylinder, 8-balanced pressure relief device, 9-fixed bearing base, 10-fixed bearing leg, 11-three-gate blowout preventer, 12-lower blowout preventer, 13-bladder type wax scraping rubber core, 14-elastic retaining ring, 15-traveling slip shell, 21-high pressure cleaning joint, 22-blowout preventer shell, 23-sealing rubber core, 24-side cover, 25-jack shell, 26-jack plunger rod, 27-metal support plate, 41-fixed cylinder, 42-secondary Moving cylinder, 43-first-stage moving cylinder, 91-housing, 92-probe wheel, 93-joint, 94-pressure cover, 95-thrust spring, 96-probe rod, 97-alarm sensor, 98-elastic baffle, 99-bearing, 101-housing, 102-shear blowout preventer, 103-oil pipe blowout preventer, 104-sucker rod blowout preventer, 105-pipe suspension gate, 106-pipe sealing rubber core, 107-pipe blowout preventer piston, 108-pipe blowout preventer lead screw, 109-rod blowout preventer piston, 110-rod blowout preventer lead screw, 111-rod suspension gate, 112-rod sealing rubber core. DETAILED DESCRIPTION

[0025] The present invention will be further described below in conjunction with the accompanying drawings:

[0026] Depend on Figures 1 to 9 As shown, a three-type pressure operation device for oilfield rod and pipe is generally used, including a traveling slip 1, the bottom of the traveling slip 1 is connected to the upper blowout preventer 2, the bottom of the upper blowout preventer 2 is connected to the telescopic working cylinder 4, the bottom of the telescopic working cylinder 4 is connected to the balanced pressure relief device 8, the bottom of the balanced pressure relief device 8 is connected to the lower blowout preventer 12, the bottom of the lower blowout preventer 12 is connected to the fixed bearing base 9, and the fixed bearing base 9 is connected to the three-gate blowout preventer 11. Four fixed bearing cylinders 7 are connected to the four corners of the fixed bearing base 9, the upper part of the fixed bearing cylinder 7 is connected to the operating platform 3, the position of the operating platform 3 corresponds to between the upper blowout preventer 2 and the balanced pressure relief device 8, and the bottom of the fixed bearing base 9 is connected to four fixed bearing legs 10. At the same time, the outside of the telescopic working cylinder 8 is connected to the four fixed bearing cylinders 7 through fixed claws, so that the device is more stable as a whole.

[0027] The traveling slip 1 comprises a traveling slip housing 15, and a capsule-type wax scraping rubber core 13 is arranged inside the traveling slip housing 15, and the upper part of the capsule-type wax scraping rubber core 13 is limited by an elastic retaining ring 14. The capsule-type wax scraping rubber core 13 can realize the self-sealing wax scraping function of the rod tube through the airbag rubber core, so as to meet the problem of large diameter difference caused by the use of the centralizer of the sucker rod, and there is no self-sealing problem. When the rod tube is out of the well and the shackle is rotated, the outer wall oil wax will not be thrown to the ground to pollute the environment, thereby reducing the construction cost of ground wax cleaning and improving the construction efficiency.

[0028] The upper BOP 2 includes a BOP housing 22, the upper end of which is connected to the floating slip 1 through a flange, a high-pressure cleaning joint 21 is connected to the BOP housing 22, and a sealant core 23 is arranged inside the BOP housing 22. A metal support plate 27 is arranged inside the sealant core 23, and the metal support plate 27 is L-shaped and vulcanized inside the sealant core to increase the strength of the sealant core. The outer side of the BOP housing 22 is connected to the jack housing 25, and the sealant core 23 is connected to the jack plunger rod 26. The jack plunger rod 26 is controlled by the hydraulic system to push the sealant core 23 to switch, seal the annular space of the oil casing when lifting and lowering the pipe string, and after balanced pressure relief, the sealant core 23 is opened and connected to the hot water steam pipeline of the environmental protection tank through the high-pressure cleaning joint 21, so as to high-pressure clean the oil wax on the outer wall of the rod pipe. The lower BOP 12 has the same structure as the upper BOP 2, is installed at the bottom of the balanced pressure relief device 8, and has the dual functions of a working BOP and a safety BOP.

[0029] The telescopic working cylinder 4 includes a fixed cylinder 41, a primary movable cylinder 43 and a secondary movable cylinder 42. The secondary movable cylinder 42 is arranged inside the fixed cylinder 41, and the primary movable cylinder 43 is arranged inside the secondary movable cylinder 42. Steps are respectively provided between the fixed cylinder 41 and the secondary movable cylinder 42, and between the secondary movable cylinder 42 and the primary movable cylinder 43, so that the fixed cylinder 41 and the secondary movable cylinder 42 are telescopically extended and retracted in the axial direction.

[0030] The fixed bearing base 9 includes a shell 91, the outer surface of the shell 91 is square, the four corners of the square are connected to the fixed bearing tube 7, the inner surface of the square is connected to the crossbeam, a pressure cover 94 is fixed on one side of the crossbeam, and a through hole is opened on the crossbeam corresponding to the pressure cover 94. A probe rod 96 is arranged inside the pressure cover 94, and a joint 93 is fixed at the front end of the probe rod 96, and the front end of the joint 93 is connected to the longitudinal probe wheel 92. A bearing 99 is arranged on the joint 93, and the joint 93 is fixed to the outer ring of the bearing. The probe wheel 92 includes two probe wheel monomers, which are connected by a shaft sleeve, and the shaft sleeve is fixed to the inner ring of the bearing through the internal shaft, so that the probe wheel 92 can rotate freely. The rear end of the probe rod 96 is connected to the alarm sensor 97, and an elastic baffle 98 is arranged on the outer circumference of the rear end of the probe rod 96, and the elastic baffle 98 is located on the outer side of the pressure cover 94; at the same time, a spring 95 is arranged at the rear end of the probe rod 96 and the pressure cover 94, and the probe rod 96 is pushed toward the center by the spring 95 in a free state.

[0031] The three-gate blowout preventer 11 comprises a housing 101, on which a shear blowout preventer 102, a tubing blowout preventer 103 and a sucker rod blowout preventer 104 are arranged in order from top to bottom. The tubing blowout preventer 103 comprises a pipe hanging gate 105 and a pipe sealant core 106, on which teeth are arranged at the upper and lower sides, and a pipe blowout preventer piston 107 is arranged outside the pipe hanging gate 105, on which a pipe blowout preventer lead screw 108 is connected. The manual pipe blowout preventer piston 107 is driven by the hydraulic system to push the pipe hanging gate 105 forward, so that the pipe sealant core 106 can hold the oil pipe; at the same time, the pipe blowout preventer lead screw 108 can be manually rotated to push the pipe blowout preventer piston 107 forward, so that the pipe sealant core 106 can also hold the oil pipe. The sucker rod blowout preventer 104 includes a rod suspension gate 111 and a rod sealant core 112. The rod sealant core 112 is provided with teeth at the upper and lower sides. A rod blowout preventer piston 109 is provided outside the rod suspension gate 111. The rod blowout preventer piston 109 is connected to a rod blowout preventer lead screw 110. The rod suspension gate 111 can be pushed forward by driving the manual rod blowout preventer piston 109 through the hydraulic system, so that the rod sealant core 112 can hold the oil pipe; at the same time, the rod blowout preventer lead screw 110 can also be manually rotated to push the pipe blowout preventer piston 109 forward, so that the rod sealant core 112 can also hold the oil pipe.

[0032] During operation, the traveling slip 1 holds the rod pipe body, closes the upper blowout preventer 2, and the telescopic working cylinder 4 moves up and down with the hydraulic cylinder. After the rising stroke is completed, the lower blowout preventer 12 and the three-gate blowout preventer 11 are closed, the balanced pressure relief device 8 is opened, and after the casing annulus pressure is removed, the traveling slip 1 and the upper blowout preventer 2 are opened, and the hydraulic cylinder drives the traveling slip 1 downward to scrape the oil wax on the rod pipe body, the upper blowout preventer 2 moves downward to clean the oil wax on the rod pipe body with high pressure, and the moving cylinder of the telescopic working cylinder 4 moves downward, and the reciprocating operation realizes safe and environmentally friendly pressurized operation without dirty oil and sewage falling to the ground.

Claims

1. A universal type III pressure operation device for oilfield rod and pipe, comprising a traveling slip (1), characterized in that: The bottom of the movable slip (1) is connected to the upper blowout preventer (2), the bottom of the upper blowout preventer (2) is connected to the telescopic working cylinder (4), the bottom of the telescopic working cylinder (4) is connected to the balanced pressure relief device (8), the bottom of the balanced pressure relief device (8) is connected to the lower blowout preventer (12), the bottom of the lower blowout preventer (12) is connected to the fixed bearing base (9), and the bottom of the fixed bearing base (9) is connected to the three-gate blowout preventer (11); The fixed bearing base (9) comprises a shell (91), a pressure cover (94) is fixed on one side of the shell (91), a probe rod (96) is arranged inside the pressure cover (94), a joint (93) is fixed at the front end of the probe rod (96), a front end of the joint (93) is connected to a probe wheel (92), a bearing (99) is arranged at the connection between the joint (93) and the probe wheel (92), the joint (93) and the outer ring of the bearing are fixed together, the probe wheel (92) comprises two probe wheel monomers, the two probe wheel monomers are connected by a shaft sleeve, and the shaft sleeve is fixed to the inner ring of the bearing through an internal shaft; the rear end of the probe rod (96) is connected to an alarm sensor (97), an elastic baffle (98) is arranged on the outer circumference of the rear end of the probe rod (96), and the elastic baffle (98) is located outside the pressure cover (94); at the same time, a spring (95) is arranged between the rear ends of the probe rod (96) and the pressure cover (94), and the probe rod (96) is pushed toward the center by the spring (95) in a free state.

2. The universal Class III pressure operation device for oil field rod and pipe according to claim 1 is characterized by: The upper portion of the fixed bearing base (9) is connected to four fixed bearing cylinders (7), the upper portion of the fixed bearing cylinders (7) is connected to an operating platform (3), and the operating platform (3) is located between the upper blowout preventer (2) and the telescopic working cylinder (4), and the bottom of the fixed bearing base (9) is connected to a fixed bearing leg (10).

3. The universal Class III pressure operation device for oil field rod and pipe according to claim 1 is characterized by: The traveling slip (1) comprises a traveling slip housing (15), wherein a capsule-type wax scraping rubber core (13) is arranged inside the traveling slip housing (15), and the upper part of the capsule-type wax scraping rubber core (13) is limited by an elastic retaining ring (14).

4. The universal Class III pressure operation device for oil field rod and pipe according to claim 1 is characterized by: The upper blowout preventer (2) comprises a blowout preventer housing (22), a sealing rubber core (23) is provided inside the blowout preventer housing (22), the outside of the blowout preventer housing (22) is connected to a jack housing (25), and the sealing rubber core (23) is connected to a jack plunger rod (26).

5. The universal Class III pressure operation device for oil field rod and pipe according to claim 4 is characterized in that: A metal support plate (27) is provided inside the sealant core (23); the metal support plate (27) is L-shaped and is vulcanized inside the sealant core (23).

6. The universal Class III pressure operation device for oil field rod and pipe according to claim 1 is characterized by: The three-gate blowout preventer (11) comprises a housing (101), and the housing (101) is provided with a shear blowout preventer (102), a tubing blowout preventer (103) and a sucker rod blowout preventer (104) in sequence from top to bottom.

7. The universal Class III pressure operation device for oil field rod and pipe according to claim 6 is characterized by: The tubing blowout preventer (103) comprises a tubing suspension gate (105) and a tubing sealant core (106). A tubing blowout preventer piston (107) is arranged outside the tubing suspension gate (105), and a tubing blowout preventer lead screw (108) is connected to the tubing blowout preventer piston (107).

8. The universal Class III pressure operation device for oil field rod and pipe according to claim 6 is characterized by: The sucker rod blowout preventer (104) comprises a rod suspension gate (111) and a rod sealing rubber core (112); a rod blowout preventer piston (109) is arranged outside the rod suspension gate (111); and a rod blowout preventer lead screw (110) is connected to the rod blowout preventer piston (109).

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