Single-cylinder double-well casing drilling fluid recovery device

Abstract

The utility model provides a single-cylinder double-well casing drilling fluid recovery device which comprises a drilling fluid recovery device body, a return outlet and a sealing gasket, the drilling fluid recovery device body is of a cylinder structure, the return outlet is formed in the drilling fluid recovery device body, and the sealing gasket is arranged on the connecting portion of the lower end face of the drilling fluid recovery device body and a well mouth base. A connecting limiting base is arranged at the bottom of the drilling fluid recycling device body and is an annular base. A plurality of fixing holes are formed in the connection limiting base, fixing bolts are arranged in the fixing holes, and the fixing bolts are connected with hoisting holes formed in the wellhead base. The method has the beneficial effects that the scheme is improved aiming at the current situation that many technical problems occur in a mode that a single-barrel double-well in an oil field can only use an occupied drilling tool to recycle drilling fluid, the drilling time efficiency is greatly improved, and the risk that the occupied drilling tool cannot be pulled out of a well hole to be scrapped is avoided. The device is simple in structure, convenient to machine, convenient to operate by workers and high in universality.

Description

Technical Field

[0001] The present invention relates to the field of drilling fluid recovery devices, and more specifically to a single-barrel double-well casing drilling fluid recovery device. Background Art

[0002] At present, the single-barrel double-well drilling technology in the Bohai Oilfield is widely used in offshore oil and gas development projects. This technology realizes the separation of multiple wellbores along a predetermined trajectory in one slot, and each wellbore is relatively independent and can complete the drilling and completion operations separately, so as to reduce the construction scale of the jacket of the offshore production platform and improve the utilization rate of the offshore slot. Maximize the economic development of the reservoir in this block.

[0003] The current common single-barrel double-well drilling methods in the oilfield are the placeholder drill form and the form of expanding the hole and running in two sets of surface casings. With the gradual increase of green environmental protection development projects in the oilfield, many nature reserves and ecological breeding areas are included in the development projects. In order to improve the utilization rate of the slot, these development projects are usually designed as single-barrel double-well slots. According to the current operation experience, to achieve both single-barrel double-well and green environmental protection development, only a closed-circuit wellhead can be installed in the placeholder drill form. For the placeholder drill form, each well needs to install a closed-circuit wellhead for silt cleaning operation and group the placeholder drill, which increases 12 hours for each single well and affects the operation efficiency; after cementing, it is necessary to use the placeholder drill to clean the cement of the adjacent well in time and take out the placeholder drill in time to prevent the risk of the placeholder drill being unable to be taken out; after taking out the placeholder drill, during the waiting for setting process of the casing, it is extremely easy to squeeze towards the side of the placeholder drill, resulting in the reduction of the wellbore size of the other well and bringing the risk of wellbore structure change. Based on the above technical problems, there is an urgent need for a single-barrel double-well casing drilling fluid recovery device to realize the successful application of the form of expanding the hole and running in two sets of surface casings for single-barrel double-well in the environmental protection zero-emission project. Summary of the Invention

[0004] The present invention overcomes the deficiencies in the prior art and provides a single-barrel double-well casing drilling fluid recovery device.

[0005] The purpose of the present invention is achieved by the following technical solutions.

[0006] The single-barrel double-well casing drilling fluid recovery device includes: the main body of the drilling fluid recovery device, a return port and a sealing gasket. The main body of the drilling fluid recovery device is of a cylindrical structure. A return port is provided on the main body of the drilling fluid recovery device. The sealing gasket is arranged at the connection part between the lower end face of the main body of the drilling fluid recovery device and the wellhead base.

[0007] A connection limit base is provided at the bottom of the main body of the drilling fluid recovery device, and the connection limit base is a circular base.

[0008] A plurality of fixing holes are provided on the connection limit base, fixing bolts are arranged in the fixing holes, and the fixing bolts are connected to the lifting holes arranged on the wellhead base.

[0009] The number of fixing holes is four.

[0010] The drilling fluid recovery device body is 2000 mm high, 1000 mm in inner diameter, and 10 mm in wall thickness.

[0011] The outer diameter of the connecting limit base is 1060 mm, and the inner diameter is 920 mm.

[0012] The return outlet is a circular hole structure with a diameter of 100 mm, and the distance from the center of the return outlet to the top surface of the drilling fluid recovery device body is 1800 mm.

[0013] The beneficial effects of the present utility model are as follows: This solution improves the current situation of many technical problems that occur when the single-tube double-well in the existing oilfield green environmental protection development project can only use the placeholder drilling tool form, greatly improving the drilling efficiency and avoiding the risk of the placeholder drilling tool being unable to be retrieved and the wellbore being scrapped. Further, the device has a simple structure, is convenient for processing, is easy for workers to operate, and has strong versatility, making it suitable for popularization and use. Description of the Drawings

[0014] Figure 1 It is a side sectional view of the present utility model;

[0015] Figure 2 It is a top view of the present utility model;

[0016] In the figure: 1. Drilling fluid recovery device body; 2. Return outlet; 3. Connecting limit base; 4. Sealing gasket; 5. Fixing hole; 6. Fixing bolt. Detailed Implementation Manner

[0017] Embodiment

[0018] The single-tube double-well casing drilling fluid recovery device includes: a drilling fluid recovery device body 1, a return outlet 2, and a sealing gasket 4. The drilling fluid recovery device body 1 is a cylindrical structure. A return outlet 2 is provided on the drilling fluid recovery device body 1. The sealing gasket 4 is arranged at the connection part between the lower end surface of the drilling fluid recovery device body 1 and the wellhead base.

[0019] A connecting limit base 3 is provided at the bottom of the drilling fluid recovery device body 1, and the connecting limit base 3 is an annular base.

[0020] A plurality of fixing holes 5 are provided on the connecting limit base 3. Fixing bolts 6 are arranged in the fixing holes 5, and the fixing bolts 6 are connected to the lifting holes provided on the wellhead base.

[0021] The number of fixing holes 5 is four.

[0022] The drilling fluid recovery device body 1 is 2000 mm high, 1000 mm in inner diameter, and 10 mm in wall thickness.

[0023] The outer diameter of the connecting limit base 3 is 1060 mm, and the inner diameter is 920 mm.

[0024] The return outlet 2 is a circular hole structure with a diameter of 100 mm. The distance from the center of the return outlet 2 to the top surface of the drilling fluid recovery device body 1 is 1800 mm.

[0025] As Figure 1 and Figure 2 shown, the working principle of the present utility model is as follows. The drilling fluid recovery device body 1 is correspondingly arranged with the single-tube double-well wellhead base device through the connecting limit base 3. The drilling fluid recovery device body 1 is used to prevent drilling fluid from overflowing during the casing running period. The return outlet 2 is used to connect the return pipeline and recover the closed-end displacement mud during the casing running operation. The return outlet 2 is connected to the centrifugal pump suction pipeline through a flange. The fixing holes 5 are the same in size and dimension as the 4 lifting holes of the single-tube double-well wellhead base. The connecting limit base 3 is fixed to the wellhead base through fixing bolts 6. The gasket 4 is used to achieve sealing with the wellhead base to ensure no leakage during the casing running.

[0026] This solution solves the current situation that only the placeholder drill tool form can be used in the single-tube double-well of the oilfield green environmental protection development project, making it possible to use the mode of reaming and running two sets of surface casings in the single-tube double-well, greatly improving the drilling efficiency and reducing the risk that the placeholder drill tool cannot be retrieved.

[0027] The above has described the embodiments of the present invention in detail, but the content described is only the preferred embodiments of the present invention and cannot be considered as limiting the scope of implementation of the present invention. All equivalent changes and improvements made according to the scope of the present invention application should still fall within the scope covered by the patent of the present invention.

Claims

1. Single-tube double-well casing drilling fluid recovery device, characterized in that, Comprising: The main body of the drilling fluid recovery device, a return outlet, and a gasket. The main body of the drilling fluid recovery device is a cylindrical structure. A return outlet is provided on the main body of the drilling fluid recovery device. The gasket is arranged at the connection part between the lower end face of the main body of the drilling fluid recovery device and the wellhead base.

2. The single-tube double-well casing drilling fluid recovery device according to claim 1, characterized in that: A connection limit base is provided at the bottom of the main body of the drilling fluid recovery device, and the connection limit base is an annular base.

3. The single-tube double-well casing drilling fluid recovery device according to claim 2, characterized in that: A plurality of fixing holes are provided on the connection limit base, and fixing bolts are arranged in the fixing holes. The fixing bolts are connected to the lifting holes provided on the wellhead base.

4. The single-tube double-well casing drilling fluid recovery device according to claim 3, characterized in that: The number of the fixing holes is four.

5. The single-tube double-well casing drilling fluid recovery device according to claim 3, characterized in that: The main body of the drilling fluid recovery device has a height of 2000 mm, an inner diameter of 1000 mm, and a wall thickness of 10 mm.

6. The single-tube double-well casing drilling fluid recovery device according to claim 5, characterized in that: The outer diameter of the connection limit base is 1060 mm, and the inner diameter is 920 mm.

7. The single-tube double-well casing drilling fluid recovery device according to claim 5, characterized in that: The return outlet is a circular hole structure with a diameter of 100 mm, and the distance from the center of the return outlet to the top end face of the main body of the drilling fluid recovery device is 1800 mm.

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