CN111963093A - Cluster pipe crossing type wellhead suspension device and ground suspension device - Google Patents

Abstract

The invention provides a cluster pipe through type wellhead suspension device and a ground suspension device, wherein the cluster pipe through type wellhead suspension device comprises: the outer slip connector is of a sleeve-shaped structure with openings at two ends; one end of the radish head hanger body is fixedly connected with one end of the outer slip connector, the radish head hanger body is provided with an axial through hole, and the axial through hole is communicated with an inner hole of the outer slip connector to form a connecting channel; the outer pipe of the bundling pipe penetrates through the connecting channel and is fixedly connected with the inner wall of the outer slip connector; the inner tube of the bundling tube is arranged in the outer tube of the bundling tube in a penetrating way. The method can be carried out under the condition of pressure in the whole process, so that the damage to a reservoir by killing a well and the consumption of raw materials such as killing fluid are avoided; the well head operation with less movement or no movement can be realized, the labor intensity is reduced, the operation efficiency is improved, and the gas production flow recovery cost caused by the change of a gas production tree after construction is avoided; the standardization and the unification of the production well mouth of the gas well on site are facilitated.

Description

Cluster pipe crossing type wellhead suspension device and ground suspension device

technical field

The invention relates to the field of oil and gas exploitation, in particular to a cluster pipe crossing type wellhead suspension device and a ground suspension device.

Background technique

For a well containing multiple layers of sandstone or coal seams, the main mining methods in the prior art are two methods: multi-layer commingled mining and multi-channel mining in the same well. Direct commingled production of reservoirs, and multi-channel production in the same well are mainly suitable for multiple storage and separate production with large differences in pressure systems. For the strata containing sandstone gas and coalbed methane in the same area, because the pressure systems of the two are quite different, and the physical properties of the two are also quite different, the main mining method is to use two wells to mine separately, and this mining method produces Higher cost and larger area. At present, there is no precedent for the combined production of sandstone gas and coalbed methane in the same well.

In recent years, with the continuous development of coiled tubing technology, the advantages of high efficiency, continuous circulation, pressurized operation, easy passage and better safety have made the application range of coiled tubing operation technology more and more extensive. The column has achieved good test and field operation effects during the well completion process, greatly improving work efficiency and reducing production costs. Therefore, the application of coiled tubing operation technology to the co-production of coalbed methane and sandstone gas has gradually become a research hotspot, and the feasibility of this method has been gradually verified.

Among them, for gas well completion, conventional tubing is usually used for well-killing. The well-killing operation causes great damage to the formation and affects the gas well production. However, using a pressure-operated device to run conventional tubing, although well-killing is avoided, there are also problems. The operation cost is high and the construction efficiency is low.

SUMMARY OF THE INVENTION

The invention provides a cluster pipe crossing-type wellhead suspension device and a ground suspension device, so as to achieve the purpose of improving operation efficiency.

The technical solution adopted by the present invention to solve the technical problem is as follows: a cluster pipe crossing type wellhead suspension device, comprising: an outer slip connector, which is a sleeve-like structure with two ends open; a radish head hanger body, one end connected to the outer One end of the slip connector is fixedly connected, the body of the radish head hanger is provided with an axial through hole, and the axial through hole communicates with the inner hole of the outer slip connector to form a connecting channel; the outer tube of the cluster tube is penetrated through the connecting channel The inner tube is fixedly connected with the inner wall of the outer slip connector; the inner tube of the cluster tube is penetrated in the outer tube of the cluster tube.

Further, the inner tube of the cluster tube is coaxially disposed inside the outer tube of the cluster tube, and an annular space is formed between the outer tube of the cluster tube and the inner tube of the cluster tube.

Further, the inner tube of the cluster tube is provided with two channels which are independent from each other and are arranged in parallel and spaced apart, and the axis of the channels is parallel to the axis of the outer tube of the cluster tube.

Further, a stage stage is provided on the outer periphery of the radish head hanger body, and the cluster pipe crossing wellhead suspension device further includes a bottom sealing pup joint, which is sleeved on the outer periphery of the radish head hanger body and is clamped with the stage stage.

Further, the stage stage includes a first step and a second step spaced along the axial direction, and the bottom seal sub joint includes: a compression rubber cylinder, which is arranged at the first step; a compression ring, which is arranged at the second step and is connected with the compression rubber. The rubber cylinders are arranged at intervals; the compression rubber cylinder pressing ring is sleeved on the outer periphery of the radish head hanger body and is located between the compressed rubber cylinder and the pressing ring, and the two ends of the compressed rubber cylinder pressing ring are respectively abutted with the compressed rubber cylinder and the pressing ring.

Further, one end of the axial through hole is provided with an inner thread segment, and an outer wall of one end of the outer slip connector is provided with an outer thread segment matched with the inner thread segment.

The invention also provides a ground suspension device, including the above-mentioned cluster pipe crossing type wellhead suspension device, the ground suspension device further includes a suspension short joint, and the radish head hanger body is clamped in the axial inner hole of the suspension short joint.

Further, the ground suspension device further includes a jack wire, which is arranged on the upper end of the suspension short section and can press the radish head hanger body against the suspension short section.

Further, the main valve, the blowout preventer, the four-ram blowout preventer, the blowout preventer box and the injection head are sequentially connected above the suspension short joint.

Further, the suspension sub joint and the main valve are connected through the oil pipe head.

The beneficial effect of the present invention is that the embodiment of the present invention can be carried out under the condition of pressure in the whole process, so as to avoid the well killing damage to the reservoir and the consumption of raw materials such as killing fluid; it can realize the operation of the wellhead with less movement or not move the wellhead, and reduce the labor intensity , which improves the operation efficiency and at the same time avoids the recovery cost of the gas production process caused by the change of the gas tree after construction; the wellhead after construction is basically unchanged from the original wellhead, which is conducive to the standardization and unification of the production wellhead of the gas well on site.

Description of drawings

The accompanying drawings forming a part of the present application are used to provide further understanding of the present invention, and the exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the attached image:

FIG. 1 is a schematic structural diagram of an embodiment of a cluster pipe crossing-type wellhead suspension device according to the present invention;

Fig. 2 is the assembly drawing of the cluster pipe crossing-type wellhead suspension device and the suspension short joint;

FIG. 3 is a schematic structural diagram of the ground suspension device of the present invention.

Reference symbols in the figure: 1. Outer slip connector; 2. Outer tube of cluster tube; 3. Inner tube of cluster tube; 4. Body of radish head hanger; Compressed rubber cartridge; 8. Injection head; 9. Blowout preventer; 10. Four-ram BOP; 11. Blowout preventer; 12. Main valve; 13. Tubing head; 14. Top wire; 15. Suspension nipple .

Detailed ways

It should be noted that the embodiments in the present application and the features of the embodiments may be combined with each other in the case of no conflict. The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

As shown in FIG. 1 , an embodiment of the present invention provides a cluster pipe crossing type wellhead suspension device, including: an outer slip connector 1 , a radish head hanger body 4 , an outer cluster tube 2 and an inner cluster tube 3 . The outer slip connector 1 has a sleeve-like structure with two ends open. One end of the radish head hanger body 4 is fixedly connected with one end of the outer slip connector 1, the radish head hanger body 4 is provided with an axial through hole, and the axial through hole communicates with the inner hole of the outer slip connector 1 and forms connection channel. The outer tube 2 of the cluster tube is passed through the connecting channel and is fixedly connected with the inner wall of the outer slip connector 1 . The inner tube 3 of the cluster tube is inserted into the outer tube 2 of the cluster tube.

The embodiment of the present invention can be carried out under the condition of full pressure, avoiding the well killing damage to the reservoir and the consumption of raw materials such as killing fluid; it can realize the operation of the wellhead less moving or not moving the wellhead, reduce the labor intensity, improve the operation efficiency, and at the same time The cost of recovering the gas production process caused by the change of the gas tree after the construction is avoided; the wellhead after the construction is basically unchanged from the original wellhead, which is conducive to the standardization and unification of the production wellhead of the on-site gas well.

The inner tube 3 of the cluster tube is coaxially disposed inside the outer tube 2 of the cluster tube, and an annular space is formed between the outer tube 2 of the cluster tube and the inner tube 3 of the cluster tube. The annular space can be used as a collection channel for sandstone gas, which facilitates collection of sandstone gas corresponding to the annular space.

It should be noted that, in this embodiment, the inner tube 3 of the cluster tube is provided with two channels that are independent of each other and are arranged in parallel and spaced apart, and the axes of the channels are parallel to the axis of the outer tube 2 of the cluster tube. One of the above two channels is used as a gas injection channel, and the other is used as a gas production channel, so that the purpose of non-interference between gas injection and gas production can be achieved.

A stage stage is arranged on the outer periphery of the radish head hanger body 4, and the cluster pipe crossing wellhead suspension device also includes a bottom sealing pup joint, which is sleeved on the outer periphery of the radish head hanger body 4 and is clamped with the stage stage. Under the action of the pipe weight of the inner tube 3 of the bundled tube and the outer tube 2 of the bundled tube, the sub-seal sub-joint can be compressed and expanded and deformed so as to achieve the purpose of secondary sealing.

Specifically, the stage stage includes a first step and a second step spaced apart in the axial direction, and the bottom seal sub-section includes a compression rubber cylinder 7 , a pressure ring 5 and a compression rubber cylinder pressure ring 6 . The compression rubber cylinder 7 is arranged at the first step; the pressure ring 5 is arranged at the second step, and is arranged at an interval with the compression rubber cylinder 7; Between the cylinder 7 and the pressure ring 5 , the two ends of the compression rubber cylinder pressure ring 6 are respectively abutted against the compressed rubber cylinder 7 and the pressure ring 5 .

During operation, the pressing ring 5 , the pressing ring 6 of the compressed rubber cylinder and the compressed rubber cylinder 7 are distributed on the outer ring of the body 4 of the radish head hanger from bottom to top. Under the action of the tube weight of the inner tube 3 of the cluster tube and the outer tube 2 of the cluster tube, the compression rubber cylinder 7 expands and deforms to achieve secondary sealing.

As shown in FIG. 1 , one end of the axial through hole in the embodiment of the present invention is provided with an internal thread segment, and an outer wall of one end of the outer slip connector 1 is provided with an external thread segment matched with the internal thread segment. The outer slip connector 1 can be connected to the axial through hole through the threaded section, so as to ensure that the load bearing of the inner tube 3 and the outer tube 2 of the cluster tube is transferred from the outer slip connector 1 to the body 4 of the radish head hanger.

As shown in FIG. 2 and FIG. 3 , an embodiment of the present invention further provides a ground suspension device, including the above-mentioned cluster pipe crossing-type wellhead suspension device, the ground suspension device further includes a suspension short joint 15, and the radish head hanger body 4 clamps Connected to the axial inner hole of the suspension short joint 15 .

During installation, the radish head hanger body 4 is snapped into the axial inner hole of the suspension short joint 15 and the top wire 14 is set on the upper end of the suspension short joint 15, so that the radish head hanger body 4 is pressed against the suspension short joint. 15.

Specifically, the main valve 12 , the blowout preventer 11 , the four-ram blowout preventer 10 , the blowout preventer box 9 and the injection head 8 are sequentially connected above the suspension short joint 15 . Wherein, the suspension short joint 15 and the main valve 12 are connected through the oil pipe head 13 . The specific working method of the ground suspension device is as follows:

After the fracturing of the new production well is completed, the operation team will connect the suspension sub-joint 15 to the tubing hanger of the original well, and then sit in the tubing head of the original wellhead together, and restore the gas production wellhead and flow.

As shown in FIG. 3 , the injection head 8 , the blowout preventer 9 , the four-ram BOP 10 and the blowout preventer 11 are directly connected to the main valve 12 in sequence, and the main valve 12 is opened to run the manifold to the designed well depth.

Start the semi-sealing and hanging rams of the four-ram BOP 10, temporarily suspend the cluster pipe at the wellhead, disassemble it from the connection between the BOP 9 and the four-ram BOP 10, and raise the BOP box. 9 To a certain height, the upper end of the four-ram BOP 10 is reserved for the installation allowance of the outer slip connector and the radish head hanger body 4, and the cluster pipe is cut with a manual cutter, and the wellhead device such as the injection head is removed.

Install the outer slip connector, the seat seal short joint and the radish head hanger body 4 in sequence at the cluster tube suspended from the wellhead, and install the hydraulically controlled retractable salvage spear and other feeding tools at the lower end of the cluster tube clamped by the injection head 8 in sequence. .

The feeding tool and the seat seal sub-joint are connected at the wellhead, and the wellhead is connected, loosen the suspension of the four-ram BOP 10 and the semi-sealing ram, and then the seat seal sub-joint is slowly fed by the injection head 8 into the suspension nipple 15, as shown in Figure 2.

The ground-operated retractable salvage spear and other tools are released from the seat seal short joint, the injection head 8 is lifted up and the feeding tool is taken out, and the radish head hanger body 4 is held up by the jacking wire 14 to further strengthen the compression rubber cylinder 7 sealing effect.

Thereby, all the installation and operation steps of the cluster pipe crossing-type wellhead suspension method of the present invention are completed. From the above description, it can be seen that the above-mentioned embodiments of the present invention achieve the following technical effects: the embodiments of the present invention can be carried out under the condition of full pressure, so as to avoid well killing damage to the reservoir and consumption of raw materials such as killing fluid; It can realize less moving wellhead or no wellhead operation, reduce labor intensity, improve operation efficiency, and avoid the recovery cost of gas production process caused by the change of Christmas tree after construction; the wellhead after construction is basically unchanged from the original wellhead , which is conducive to the standardization and unification of on-site gas well production wellheads.

The above descriptions are only specific embodiments of the present invention, and cannot limit the scope of implementation of the invention. Therefore, the replacement of equivalent components, or the equivalent changes and modifications made according to the scope of the patent protection of the present invention should still be covered by this patent. category. In addition, in the present invention, the technical features and the technical features, the technical features and the technical solutions, and the technical solutions and the technical solutions can be freely combined and used.

Claims (10)

1. A bundled pipe crossing type wellhead suspension device is characterized in that, comprising: The outer slip connector (1) has a sleeve-like structure with openings at both ends; The radish head hanger body (4) has one end fixedly connected with one end of the outer slip connector (1), the radish head hanger body (4) is provided with an axial through hole, and the axial through hole is connected with the outer slip The inner hole of the device (1) communicates and forms a connection channel; an outer tube (2) of the cluster tube, which is penetrated in the connecting channel and is fixedly connected with the inner wall of the outer slip connector (1); The inner tube (3) of the cluster tube is penetrated in the outer tube (2) of the cluster tube. 2 . The bundled tube crossing type wellhead suspension device according to claim 1 , wherein the bundled tube inner tube (3) is coaxially inserted into the bundled tube outer tube (2) at a coaxial interval, and the bundled tube outer tube (2) An annulus is formed with the inner tube (3) of the cluster tube. 3 . The cluster tube crossing type wellhead suspension device according to claim 2 , wherein the inner tube ( 3 ) of the cluster tube is provided with two channels that are independent of each other and are arranged in parallel and spaced apart, and the axis of the channels is connected to the outer tube of the cluster tube. 4 . The axes of (2) are parallel. 4 . The bundled tube crossing type wellhead suspension device according to claim 1 , wherein a stage stage is provided on the outer periphery of the radish head hanger body (4), and the bundled tube crossing type wellhead suspension device further comprises a bottom sealing pup joint. 5 . , which is sleeved on the outer periphery of the radish head hanger body (4) and is clamped with the stage. 5 . The bundled pipe crossing type wellhead suspension device according to claim 4 , wherein the stage stage comprises a first step and a second step spaced apart along the axial direction, and the bottom seal sub joint comprises: 6 . A compressed rubber cylinder (7), arranged at the first step; a pressure ring (5), arranged at the second step, and arranged at an interval from the compressed rubber cylinder (7); The compression rubber cylinder pressing ring (6) is sleeved on the outer periphery of the radish head hanger body (4) and is located between the compression rubber cylinder (7) and the pressing ring (5), and the two ends of the compression rubber cylinder pressing ring (6) are respectively Abut with the compressed rubber cylinder (7) and the pressure ring (5). 6. The wellhead suspension device of claim 1, wherein one end of the axial through hole is provided with an internal thread section, and one end of the outer wall of the outer slip connector (1) is provided with a The male thread segment that the female thread segment mates with. 7. A ground suspension device, comprising the cluster pipe crossing type wellhead suspension device according to any one of claims 1 to 6, characterized in that the ground suspension device further comprises a suspension short joint (15), a radish head hanging The device body (4) is clamped in the axial inner hole of the suspension short joint (15). 8. The ground suspension device according to claim 7, characterized in that, the ground suspension device further comprises a jack wire (14), which is arranged at the upper end of the suspension short joint (15) and capable of attaching the radish head hanger body (4). ) pressed against the suspension sub joint (15). 9. The ground suspension device according to claim 8, characterized in that the main valve (12), the blowout preventer (11), the four-ram blowout preventer (10), Blowout preventer (9) and injection head (8). 10 . The ground suspension device according to claim 9 , wherein the suspension sub joint ( 15 ) and the main valve ( 12 ) are connected through an oil pipe head ( 13 ). 11 .

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