Injection device in operation field

Abstract

An injection device in the operation field belongs to the technical field of oil field engineering operation and comprises a left annular space sealing device and a right annular space sealing device, an upper flange and a lower flange are connected with a wellhead device in a sealed mode, an oil pipe in the wellhead device is connected in a clamped mode, and the upper flange and the lower flange are provided with flange center holes for the oil pipe to penetrate through. A sealing cutter sealing groove without an inner cavity and a sealing cutter sealing groove with an injection cavity are formed in the left side annular space sealing device, a sealing cutter sealing channel without an inner cavity and a sealing cutter sealing channel with an injection cavity are formed in the right side annular space sealing device, and a sealing cutter without an inner cavity is arranged in the sealing cutter sealing channel without the inner cavity. And a sealing cutter with an injection cavity is arranged in the sealing cutter sealing channel with the injection cavity. The problem that the pressure in the oil pipe is out of control in the pipe lifting process is solved by combining various existing operation technological means such as under-pressure, overhaul, gas wells and continuous oil pipes, the construction technology is simple, and the cost is low.

Description

Technical Field

[0001] This invention belongs to the field of oilfield engineering operation technology, and specifically relates to an injection device for operation fields. Background Technology

[0002] Live well operation technology is a key technology developed in recent years to protect formation energy and prevent environmental pollution, playing a significant role in oilfield development and production. Tubing plugging technology is the most critical technical aspect of live well operation. Over the years, it has evolved from initially plugging the water distributor to plugging any position on the tubing string; from requiring plugging tools to be inserted and retrieved at any time; from wire-stretched sealing to self-sealing by liquid pressure; and from pressure resistance ratings of 5 MPa to the current maximum of 40 MPa. However, it remains unable to solve the special situation of sudden plugging failure during tubing tripping, especially as oilfields across the country have entered the middle and late stages of development, with severe scaling inside the tubing and extremely poor stability of plugging devices. Situations frequently occur where plugging devices fly out of the tubing during tripping, causing large-scale land pollution and contamination of surrounding rivers, cities, and villages due to high well pressure. Currently, besides relatively primitive well-killing methods, even well-killing requires top-jet installation of kill lines, and there are no effective remedial measures. Summary of the Invention

[0003] To address the aforementioned problems, this invention proposes an injection device for a working area, comprising a left annular space sealing device and a right annular space sealing device. The left and right annular space sealing devices are sealed to a wellhead device via an upper flange and a lower flange. The upper and lower flanges are provided with flange center holes for the tubing to pass through. The left and right annular space sealing devices clamp and connect the tubing within the wellhead device. The left annular space sealing device and the right annular space sealing device push a hydraulic cylinder... The right annular space sealing device is connected to the right annular space sealing device drive cylinder. The left annular space sealing device is equipped with a sealing cutter groove without an inner cavity and a sealing cutter groove with an injection cavity. The right annular space sealing device is equipped with a sealing cutter channel without an inner cavity and a sealing cutter channel with an injection cavity. The sealing cutter channel without an inner cavity is equipped with a sealing cutter without an inner cavity. The sealing cutter without an inner cavity is connected to the sealing cutter drive cylinder without an inner cavity. The sealing cutter channel with an injection cavity is equipped with a sealing cutter with an injection cavity. The sealing cutter with an injection cavity is connected to the sealing cutter drive cylinder with an injection cavity.

[0004] Furthermore, the sealing cutter with injection chamber has a sealing cutter inner cavity, one end of the sealing cutter inner cavity is provided with a cutter oil pipe injection port, the cutter oil pipe injection port is arranged opposite to the oil pipe cut below, and the other end of the sealing cutter inner cavity is connected to an external tanker truck containing injection medium through a cutter injection medium connector.

[0005] Furthermore, the hydraulic cylinder driving the sealing cutter with the injection chamber is connected to the sealing cutter with the injection chamber via a seal.

[0006] Furthermore, the injection medium carried by the external tanker is brine, a chemical fluid bridge plug, or cement.

[0007] Furthermore, the blade of the sealing cutter with the injection cavity has a sharp shape.

[0008] Furthermore, the blade of the cavityless sealing cutter has a straight blade head shape.

[0009] Furthermore, the left annular space sealing device is connected to the left annular space sealing device push cylinder via a left annular space sealing device connector.

[0010] Furthermore, the right-side annular space sealing device is connected to the right-side annular space sealing device drive cylinder via the right-side annular space sealing device cylinder connector.

[0011] The beneficial effects of this invention are as follows: This invention can combine various existing operational techniques such as live tubing, overhaul, gas wells, and coiled tubing to solve the problem of uncontrolled internal pressure in the tubing during the tubing tripping process. At the same time, the construction cost is low, the construction process is simple, and the effect is good.

[0012] 1. Solved difficult well plugging problems, especially those involving severe scaling inside the pipe, complex debris such as steel wires and small parts inside the pipe, and pipe bending.

[0013] 2. Improved construction efficiency: After the high pressure inside the oil pipe is blocked by the injected medium, the construction difficulty is the same as that of ordinary minor repair work, which greatly reduces the difficulty of the operation and improves the efficiency of the operation.

[0014] 3. It has a wide range of applications. In addition to being used in pressurized operations, it can also be used in many fields such as overhaul, gas wells, and coiled tubing, and can solve the problem of uncontrolled pressure in the tubing in many fields.

[0015] 4. This invention can achieve instantaneous well sealing by cutting off the oil tubing inside the well, and can also achieve well sealing without oil tubing;

[0016] 5. Prevent high-pressure fluids inside the well from polluting the environment, villages, and other sensitive areas. Attached Figure Description

[0017] Figure 1This is a schematic diagram of the injection device structure of the present invention;

[0018] Figure 2 This is a schematic diagram of the sealing cutter structure with an injection cavity of the present invention;

[0019] Figure 3 This is a schematic diagram of the cavity-free sealing cutter structure of the present invention;

[0020] Figure 4 This is a schematic diagram of the annular space sealing device of the present invention.

[0021] 1. Upper flange; 2. Flange center hole; 3. Left annular space sealing device; 31. Sealing cutter groove without inner cavity; 32. Sealing cutter groove with injection cavity; 4. Right annular space sealing device; 41. Sealing cutter channel without inner cavity; 42. Sealing cutter channel with injection cavity; 5. Right annular space sealing device hydraulic cylinder connector; 6. Right annular space sealing device drive hydraulic cylinder; 7. Sealing cutter without inner cavity; 8. Sealing cutter with injection cavity; 9. Sealing cutter drive hydraulic cylinder without inner cavity; 10. Sealing cutter inner cavity; 11. Sealing cutter drive hydraulic cylinder with injection cavity; 12. Cutter injection medium connector; 13. Cutter oil pipe injection port; 14. Lower flange; 15. Left annular space sealing device push hydraulic cylinder; 16. Left annular space sealing device connector; 17. Seal. Detailed Implementation

[0022] To make the technical means and objectives of this invention easier to understand, the invention is further described below in conjunction with specific embodiments. An injection device for a working field includes a left annular space sealing device 3 and a right annular space sealing device 4. The left annular space sealing device 3 and the right annular space sealing device 4 are sealed to the wellhead device via an upper flange 1, and are also sealed to the wellhead device via a lower flange 14. The upper flange 1 and the lower flange 14 are provided with flange center holes 2 for the tubing to pass through. The left annular space sealing device 3 and the right annular space sealing device 4 clamp and connect the tubing inside the wellhead device. The left annular space sealing device 3 and the right annular space sealing device 4 are sealed to the left annular space sealing device. The sealing device is connected to the push cylinder 15. The right annular space sealing device 4 is connected to the right annular space sealing device drive cylinder 6. The left annular space sealing device 3 is provided with a sealing cutter sealing groove 31 without an inner cavity and a sealing cutter sealing groove 32 with an injection cavity. The right annular space sealing device 4 is provided with a sealing cutter sealing channel 41 without an inner cavity and a sealing cutter sealing channel 42 with an injection cavity. A sealing cutter 7 without an inner cavity is provided in the sealing cutter sealing channel 41 without an inner cavity. The sealing cutter 7 without an inner cavity is connected to the sealing cutter drive cylinder 9 without an inner cavity. A sealing cutter 8 with an injection cavity is provided in the sealing cutter sealing channel 42 with an injection cavity. The sealing cutter 8 with an injection cavity is connected to the sealing cutter drive cylinder 11 with an injection cavity.

[0023] The sealing cutter 8 with injection chamber has a sealing cutter inner cavity 10. One end of the sealing cutter inner cavity 10 is provided with a cutter oil pipe injection port 13, which is positioned opposite to the oil pipe cut below. The other end of the sealing cutter inner cavity 10 is connected to an external tanker truck containing injection medium through a cutter injection medium connector 12.

[0024] The sealing cutter drive cylinder 11 with injection cavity is connected to the sealing cutter 8 with injection cavity through a sealing element 17.

[0025] The external tanker truck carries an injection medium that is either brine, a chemical fluid bridge plug, or cement.

[0026] The blade of the sealing cutter 8 with the injection cavity has a sharp shape.

[0027] The sealing cutter 7 without an inner cavity has a flat cutter head.

[0028] The left annular space sealing device 3 is connected to the left annular space sealing device push cylinder 15 via the left annular space sealing device connector 16.

[0029] The right annular space sealing device 4 is connected to the right annular space sealing device drive cylinder 6 via the right annular space sealing device cylinder connector 5.

[0030] Its structural features include: after the oil pipe enters the device through the flange center hole 2, the annular sealing device closes under the push of the hydraulic cylinder, clamping the oil pipe and sealing the annular space of the oil pipe. The sealing cutter 8 with an injection cavity cuts the oil pipe under the push of the hydraulic cylinder. Since the oil pipe is generally made of K55 and J55, which are brittle, the cut surface is relatively neat, leaving sufficient space for the required medium to be injected into the oil pipe from the inner cavity of the sealing cutter 8 with an injection cavity. Before the sealing cutter 8 with an injection cavity begins injection, the sealing cutter 7 without an inner cavity cuts the upper end of the oil pipe, achieving a second sealing effect and preventing the injected high-pressure medium from overflowing from the top of the device, thus avoiding construction risks and environmental pollution—a double protection. After the sealing cutter 7 without an inner cavity closes, the medium enters the cavity of the sealing cutter 8 with an injection cavity through the cutter injection medium connector 12 and is injected into the oil pipe from the cutter oil pipe injection port 13, achieving the purpose of sealing the pressure inside the oil pipe, and then proceeding to the next operation.

[0031] The upper flange 1 connects to the wellhead device and can effectively seal the pressure inside the well;

[0032] The diameter of flange center hole 2 meets the dimensions of downhole fittings and tools;

[0033] The left annular space sealing device 3 is equipped with a running slide rail to ensure stable operation during the opening and closing process. At the same time, the left annular sealing device has two sealing grooves inside. When the two cutters cut the oil pipe, they are inserted into the sealing groove 31 of the sealing cutter without an inner cavity and the sealing groove 32 of the sealing cutter with an injection cavity to effectively seal the well pressure that surges up from the oil pipe and the annular space.

[0034] The right-side annular sealing device 4 has two sealing channels, which can seal the pressure inside the annular space well while sealing the gap between the cutter and the channel.

[0035] The hydraulic cylinder connector 5 of the right annular space sealing device can ensure that the driving hydraulic cylinder can effectively drive the right annular space sealing device 4.

[0036] The right-side annular space sealing device pushes the liquid cylinder 6, providing the sealing force of the right-side annular space sealing device 4.

[0037] The cavityless sealing cutter 7 is designed with a straight cutter head, which has strong cutting stability, strong sealing performance, and good durability. When the cutter head is driven by the cavityless sealing cutter drive cylinder 9, it is completely inserted into the left annular space sealing device 3. The tail of the cutter head is still in the sealing channel 41 of the right annular sealing device, ensuring that the cutter is always in a sealed state, effectively sealing the upward pressure in the well and preventing it from escaping to the outside of the device through the gap at the cutter tail.

[0038] The sealing cutter 8 with injection cavity is designed with a sharp shape to effectively penetrate the oil pipe and ensure a clean cut. After the oil pipe is cut, it can rise along the bevel of the cutter head to prevent damage to the cutter. The cutter is designed so that when the cutter enters the left sealing groove, the injection port of the cutter cavity is exactly aligned with the cut of the oil pipe below, ensuring that the medium is injected into the inner cavity of the lower oil pipe while maintaining a seal.

[0039] The cutting tool injection medium connector 12, in conjunction with an external tanker truck or pump truck, injects the selected medium into the tubing through the connector and the sealed inner cavity 10 of the cutting tool. The medium can be brine to achieve well control, chemical fluid bridge plugs to seal long lengths of tubing in the well, or cement to seal more complex tubing or other drilling tools.

[0040] The cutter tubing injection port 13 is designed with a reasonable diameter, achieving a flow rate of 40L / S and an injection pressure of 60MPa to cope with extreme downhole conditions.

[0041] Lower flange 14 ensures a sealed connection between the device and the wellhead equipment;

[0042] The left-side annular space sealing device drives the liquid cylinder 15 to ensure the effective operation of the annular sealing device;

[0043] A sealing element 17 is installed between the inner cavity cutter and the hydraulic cylinder. Due to the nature of this invention, the cutter is needed as a medium to effectively connect the outside and inside of the device. The cutter needs to travel through the center of the hydraulic cylinder, and the sealing element prevents internal pressure from leaking out of the device. Through the configuration of 1-17 and its multiple functions, it is possible to seal uncontrolled pressure in the tubing within the well, and to seal open wells. Besides live-line operations, when used in conjunction with wellhead devices, it can achieve optimal results in various high-pressure operation fields.

[0044] To address the issue of pressure runaway during tubing installation, a multi-purpose, multi-functional device is designed to fundamentally resolve the potential risks at their source. When pressure runaway occurs within the tubing, the device cuts off the tubing and simultaneously seals the annular space. After sealing the annular space, brine, liquid bridge plugs, or cement are injected into the tubing through the inner cavity of the cutter, achieving well control or sealing the pressure within the tubing. This completely resolves the problem of pressure runaway during construction, while also avoiding the construction risks and environmental pollution risks associated with conventional top-spraying workovers after a runaway. Besides pressurized operations, this device can also be used in workovers, gas wells, coiled tubing, and other fields. It can solve problems such as plugging device failure, well blockages (such as wire or small objects), and emergency well sealing. Its effectiveness is significant, and its applications are wide-ranging.

[0045] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A field injection device, characterized in that, It includes a left annular space sealing device (3) and a right annular space sealing device (4). The left annular space sealing device (3) and the right annular space sealing device (4) are sealed to the wellhead device through an upper flange (1). The left annular space sealing device (3) and the right annular space sealing device (4) are sealed to the wellhead device through a lower flange (14). The upper flange (1) and the lower flange (14) are provided with flange center holes (2) for the tubing to pass through. The left annular space sealing device (3) and the right annular space sealing device (4) clamp and connect the tubing in the wellhead device. The left annular space sealing device (3) is connected to the left annular space sealing device push cylinder (15). The right annular space sealing device (4) is connected to the right annular space sealing device push cylinder (15). The annular space sealing device is connected to the driving cylinder (6). The left annular space sealing device (3) is provided with a sealing cutter groove (31) without an inner cavity and a sealing cutter groove (32) with an injection cavity. The right annular space sealing device (4) is provided with a sealing cutter channel (41) without an inner cavity and a sealing cutter channel (42) with an injection cavity. A sealing cutter (7) without an inner cavity is provided in the sealing cutter channel (41). The sealing cutter (7) without an inner cavity is connected to the sealing cutter driving cylinder (9) without an inner cavity. A sealing cutter (8) with an injection cavity is provided in the sealing cutter channel (42). The sealing cutter (8) with an injection cavity is connected to the sealing cutter driving cylinder (11) with an injection cavity.

2. The injection device for the work area as described in claim 1, characterized in that, The sealing cutter (8) with injection cavity is provided with a sealing cutter inner cavity (10). One end of the sealing cutter inner cavity (10) is provided with a cutter oil pipe injection port (13). The cutter oil pipe injection port (13) is arranged opposite to the oil pipe cut below. The other end of the sealing cutter inner cavity (10) is connected to an external tanker truck containing injection medium through a cutter injection medium connector (12).

3. The injection device for the work area as described in claim 2, characterized in that, The hydraulic cylinder (11) for driving the sealing cutter with the injection chamber is connected to the sealing cutter (8) with the injection chamber via a seal (17).

4. The injection device for the work area as described in claim 2, characterized in that, The external tanker truck carries an injection medium that is either brine, a chemical fluid bridge plug, or cement.

5. The injection device for the work area as described in claim 1, characterized in that, The blade of the sealing cutter (8) with injection cavity has a sharp shape.

6. The work area injection device as described in claim 1, characterized in that, The blade of the cavityless sealing cutter (7) has a straight blade head.

7. The injection device for the work area as described in claim 1, characterized in that, The left annular space sealing device (3) is connected to the left annular space sealing device push cylinder (15) through the left annular space sealing device connector (16).

8. The injection device for the work area as described in claim 1, characterized in that, The right annular space sealing device (4) is connected to the right annular space sealing device drive cylinder (6) through the right annular space sealing device cylinder connector (5).

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