Cluster well preassembled well head gland

Abstract

The invention discloses a preassembled well head gland of a cluster well. The preassembled well head gland comprises a gland body, a sealing rubber mat and a fixed tray which are sequentially connected from top to bottom, the gland body is composed of a main gland body and an auxiliary gland body which are connected through a connecting assembly. The connecting assembly comprises a main horizontal nut, an auxiliary horizontal nut and a horizontal pressing rod connected between the main horizontal nut and the auxiliary horizontal nut. The device is simple in structure and convenient to use, well heads of a single-barrel single well and a single-barrel double well can be effectively sealed, and a powerful guarantee is provided for safe and smooth implementation of drilling operation.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of drilling and completion operation in the oil industry, and particularly relates to a cluster well pre-installed wellhead head cover. BACKGROUND

[0002] In drilling engineering, when multiple wells on the same platform are developed at the same time, in order to improve the operation efficiency, batch drilling operation is often used for each well section. When surface batch drilling operation is carried out, due to the small distance between adjacent pile pipes and the thin middle partition wall, it is easy to occur cross leakage with adjacent pile pipes during drilling, so that the accumulation of cuttings in the wellbore may cause the occurrence of sticking and other conditions. If the wellhead head is pre-installed on the adjacent pile pipe in advance, and then the wellhead is sealed, the cross leakage with the adjacent pile pipe can be effectively avoided. In addition, for single-cylinder double wells, when the first well is operated, the wellhead of the second well also needs to be sealed to establish a closed circulation. Therefore, whether it is a single-cylinder single well or a single-cylinder double well, it is necessary to effectively seal the wellhead head. SUMMARY

[0003] The present application is proposed to solve the sealing problem of the pre-installed wellhead head of the cluster well in the existing drilling engineering, and the purpose is to provide a cluster well pre-installed wellhead head cover.

[0004] The present application is realized by the following technical scheme: A cluster well pre-installed wellhead head cover, comprising a cover body, a sealing gasket and a fixed tray connected in sequence from top to bottom; the cover body is composed of a main cover and an auxiliary cover connected by a connecting assembly; the connecting assembly comprises a main horizontal nut, an auxiliary horizontal nut and a horizontal pressure rod connected between the main horizontal nut and the auxiliary horizontal nut.

[0005] In the above technical scheme, the cover body, the sealing gasket and the fixed tray are connected by fixed bolts.

[0006] In the above technical scheme, the main horizontal nut is fixed on the top surface of the main cover; the auxiliary horizontal nut is fixed on the top surface of the auxiliary horizontal nut; the main horizontal nut, the auxiliary horizontal nut and the horizontal pressure rod are coaxially arranged.

[0007] In the above technical scheme, the cover body is a disc-shaped structure composed of the main cover and the auxiliary cover; the abutting end faces of the main cover and the auxiliary cover are both inclined surfaces, and the end face of the main cover and the abutting end face of the auxiliary cover are arranged in reverse mirror image.

[0008] In the above technical scheme, the periphery of the cover body is uniformly distributed with a plurality of bolt holes, and the distribution positions of the bolt holes are consistent with the bolt positions on the upper end surface of the wellhead head.

[0009] In the above technical scheme, a fixed bolt hole is formed in the middle of the bottom surface of the cover body.

[0010] In the above technical solution, the material of the gland body, the fixed tray and the fixed bolt is metal; and the material of the sealing rubber pad is rubber.

[0011] In the above technical solution, the material of the gland body, the fixed tray and the fixed bolt is metal; and the material of the sealing rubber pad is rubber.

[0012] The beneficial effects of the present application are: The present application provides a special gland for sealing the pre-installed well head of a cluster well, which is designed according to the actual needs of field operation, has a simple structure, is safe and convenient to use, can effectively seal the well head, and can prevent the adjacent pile pipes from leaking by pre-installing the well head and sealing the well head.

[0013] The device has simple principle and structure, is safe and convenient to use, uses rubber sealing, has low production cost and can be reused, and has a variety of sealing positions and is more convenient to use, as the sealing position is the inner chamfer end face of the top of the well head, which breaks through the limitations of conventional steel ring sealing, such as high processing precision requirement, easy deformation and sealing failure due to collision, and rusting and difficult cleaning of the steel ring groove, and the device can be used for single-cylinder single well and single-cylinder double well by selecting the auxiliary gland for connection and removal, and can be used for different diameters of the inner chamfer of the top of the well head by using the semi-spherical sealing, so the device has a wider application range. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 is the front view of the present application; Figure 2 is the test view of the present application.

[0015] Among them: 1, gland body; 11, main body gland; 12, auxiliary gland; 13, fixed bolt hole; 14, bolt hole; 2, sealing rubber pad; 3, fixed tray; 4, fixed bolt; 5, main horizontal nut; 6, auxiliary horizontal nut; 7, horizontal pressing rod.

[0016] For ordinary skilled persons in the art, other related drawings can be obtained according to the above drawings without creative labor. DETAILED DESCRIPTION

[0017] In order to enable the personnel in the technical field to better understand the technical solutions of the present application, the technical solutions of the present application will be further described below by combining with the drawings of the specification and through specific embodiments.

[0018] As Figure 1 , Figure 2As shown, a cluster well pre-installed wellhead cap includes a cap body 1, a sealing gasket 2, and a fixing tray 3 arranged sequentially from top to bottom. The cap body 1, the sealing gasket 2, and the fixing tray 3 are connected by fixing bolts 4. The pressure cap body 1 is composed of a main pressure cap 11 and an auxiliary pressure cap 12, which are connected by a connecting component. The connecting assembly includes a main horizontal nut 5, an auxiliary horizontal nut 6, and a horizontal pressure rod 7 connecting the main horizontal nut 5 and the auxiliary horizontal nut 6; the main horizontal nut 5 is fixed to the top surface of the main body cover 11; the auxiliary horizontal nut 6 is fixed to the top surface of the auxiliary horizontal nut 6; the main horizontal nut 5, the auxiliary horizontal nut 6, and the horizontal pressure rod 7 are arranged coaxially. The main horizontal nut 5 and the auxiliary horizontal nut 6 can be used as lifting lugs, and can also be used to connect and level the main cover and the auxiliary cover by using two horizontal pressure rods, so that the main cover and the auxiliary cover are combined into a regular pie chart shape. The pressure cap body 1 is a disc-shaped structure composed of a main pressure cap 11 and an auxiliary pressure cap 12; The cut edges of the main pressure cap 11 and the auxiliary pressure cap 12 that are in contact with each other are both beveled, and the end face of the main pressure cap 11 and the cut edge of the auxiliary pressure cap 12 that are in contact with each other are mirror images of each other, that is, the cut edge of the main pressure cap 11 and the auxiliary pressure cap 12 can be completely attached and achieve the function of pressing and sealing. The pressure cap body 1 has a plurality of bolt holes 14 evenly distributed around its four edges. The distribution of the bolt holes 14 is consistent with the bolt position on the upper end face of the wellhead, and is used to connect the bolt to the wellhead. A fixing bolt hole 13 is formed in the middle of the bottom surface of the pressure cap body 1, which is used to connect the sealing gasket and the fixing tray through the fixing bolt; The sealing gasket 2 is hemispherical, and its upper and lower end faces are both flat. The upper end face is in close contact with the bottom surface of the pressure cap body 1, and the lower end face is in contact with the fixed tray 3. The sealing is achieved by the hemispherical surface of the sealing gasket 2 being in close contact with the inner chamfered end face of the top of the wellhead. The pressure cap body 1, the fixing tray 3, and the fixing bolt 4 are all made of metal.

[0019] The sealing gasket 2 is made of rubber.

[0020] How to use this invention: When a single-tube double-wellhead needs to be sealed, connect the main body cover, sealing gasket, and fixing tray with fixing bolts. Then, apply grease evenly to the hemispherical surface of the sealing gasket and clean the inner chamfered end face of the top of the wellhead body. Hoist the device to the top of the wellhead, aligning the bolt holes on the main body cover with the connecting bolts on the wellhead. Slowly lower the device so that the connecting bolts on the wellhead pass through the bolt holes on the main body cover, and ensure that the surface of the rubber hemisphere fits tightly against the inner chamfered end face of the top of the wellhead body. Finally, tighten the nuts that match the connecting bolts on the wellhead to achieve a wellhead seal.

[0021] The operating steps for a single-tube dual-well system are as follows: S1. Connect the main body cover to the sealing gasket and the fixing tray using fixing bolts; S2. Apply grease evenly to the surface of the sealing gasket hemispherical surface and clean the inner chamfered end face of the top of the wellhead body; S3. Hoist the device to the top of the wellhead, so that the bolt holes on the main body cover are aligned with the connecting bolts on the wellhead. Then slowly lower the device so that the connecting bolts on the wellhead pass through the bolt holes on the main body cover and the rubber hemispherical surface fits tightly against the inner chamfered end face of the top of the wellhead body. S4. Tighten the nuts that match the connecting bolts on the wellhead to achieve a wellhead seal.

[0022] When a single-tube, single-well wellhead needs sealing, the auxiliary cover and the main cover are connected and fixed using a horizontal pressure rod. Then, the entire cover is connected to the sealing gasket and the fixing tray using fixing bolts. Next, apply grease evenly to the hemispherical surface of the sealing gasket and clean the inner chamfered end face of the top of the wellhead body. Then, hoist the device to the top of the wellhead, aligning the bolt holes on the main cover and auxiliary cover with the connecting bolts on the wellhead. Then, slowly lower the device so that the connecting bolts on the wellhead pass through the bolt holes and the rubber hemispherical surface fits tightly against the inner chamfered end face of the top of the wellhead body. Finally, tighten the nuts that match the connecting bolts on the wellhead to achieve wellhead sealing.

[0023] The operating steps for a single-tube single-well are as follows: S1. Connect and fix the auxiliary cover and the main cover using a horizontal pressure bar; S2. Connect the entire gland to the sealing gasket and the fixing tray using fixing bolts; S3. Apply grease evenly to the surface of the sealing gasket hemispherical surface and clean the inner chamfered end face of the top of the wellhead body; S4. Hoist the device to the top of the wellhead, aligning the bolt holes on the main cover and auxiliary cover with the connecting bolts on the wellhead. Then slowly lower the device so that the connecting bolts on the wellhead pass through the bolt holes and the rubber hemispherical surface fits tightly against the inner chamfered end face of the top of the wellhead body. S5. Tighten the nuts that match the connecting bolts on the wellhead to achieve a wellhead seal.

[0024] This invention innovatively employs a hemispherical rubber gasket that tightly adheres to the inner chamfered end face of the wellhead to achieve a wellhead seal. Firstly, the use of rubber sealing not only reduces production costs but also allows for reuse. Secondly, the sealing location is the inner chamfered end face of the wellhead, overcoming the limitations of conventional steel ring seals, such as high processing precision requirements, susceptibility to deformation leading to seal failure, and difficulty in cleaning due to rust in the steel ring groove. This allows for diverse sealing locations and greater ease of use. Furthermore, by selecting and removing auxiliary pressure caps, this invention is suitable for both single-tube single-well and single-tube double-well applications. The hemispherical seal also allows for various diameters of the inner chamfered end face of the same wellhead, broadening its applicability.

[0025] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0026] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0027] The applicant declares that the above description is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention fall within the protection and disclosure scope of the present invention.

Claims

1. A pre-installed wellhead cap for cluster wells, characterized in that: It includes a pressure cap body (1), a sealing gasket (2) and a fixing tray (3) connected from top to bottom; the pressure cap body (1) consists of a main pressure cap (11) and an auxiliary pressure cap (12) connected by a connecting assembly; the connecting assembly includes a main horizontal nut (5), an auxiliary horizontal nut (6) and a horizontal pressure bar (7) connecting the main horizontal nut (5) and the auxiliary horizontal nut (6).

2. The pre-installed wellhead cap for cluster wells according to claim 1, characterized in that: The pressure cap body (1), sealing gasket (2) and fixing tray (3) are connected by fixing bolts (4).

3. The pre-installed wellhead cap for cluster wells according to claim 1, characterized in that: The main horizontal nut (5) is fixed to the top surface of the main body cover (11); the auxiliary horizontal nut (6) is fixed to the top surface of the auxiliary horizontal nut (6); the main horizontal nut (5), the auxiliary horizontal nut (6) and the horizontal pressure rod (7) are arranged coaxially.

4. The pre-installed wellhead cap for cluster wells according to claim 1, characterized in that: The pressure cap body (1) is a disc-shaped structure composed of a main pressure cap (11) and an auxiliary pressure cap (12); the cut edges of the main pressure cap (11) and the auxiliary pressure cap (12) are both beveled, and the end face of the main pressure cap (11) and the cut edge of the auxiliary pressure cap (12) are mirror images of each other.

5. The pre-installed wellhead cap for cluster wells according to claim 1, characterized in that: The pressure cap body (1) has multiple bolt holes (14) evenly distributed around its perimeter, and the distribution of the bolt holes (14) is consistent with the bolt position on the upper end face of the wellhead.

6. The pre-installed wellhead cap for cluster wells according to claim 1, characterized in that: A fixing bolt hole (13) is formed in the middle of the bottom surface of the pressure cap body (1).

7. The pre-installed wellhead cap for cluster wells according to claim 1, characterized in that: The sealing gasket (2) is a frustum-shaped structure with a spherical circumferential wall, and its large-diameter end face is in close contact with the bottom surface of the gland body (1).

8. The pre-installed wellhead cap for cluster wells according to claim 1, characterized in that: The pressure cap body (1), the fixing tray (3) and the fixing bolt (4) are all made of metal; the sealing gasket (2) is made of rubber.

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