Sand control screen pipe for oil field exploitation

Abstract

The utility model relates to the technical field of sand control screen pipes, and discloses a sand control screen pipe for oil field exploitation, which comprises a base pipe, a protective pipe, a protective groove plate and connecting mechanisms, the connecting mechanisms are arranged at the top and the bottom of the base pipe, the protective pipe is arranged outside the base pipe, the protective groove plate is fixedly connected inside the protective pipe, and the protective groove plate is fixedly connected with the protective pipe. The screen pipe can be prevented from being blocked by silt through the protective groove plate, eight liquid inlets are formed in the base pipe and evenly distributed in the base pipe, liquid is evenly fed through the eight liquid inlets, the liquid inlet area is increased, the liquid inlet efficiency is improved, the filter layer is fixedly connected to the outer portion of the base pipe, the filter plate is fixedly connected to the outer portion of the filter layer, and the filter plate is fixedly connected to the outer portion of the filter plate. And a trapezoidal filtering seam is formed in the filtering plate. The protection pipe and the protection groove plate are in contact with the well wall during installation, and the filtering seam of the protection groove plate is formed in the side face, so that blockage caused by scraping of the inner wall of an oil well during installation can be prevented, smoothness of the filtering seam is guaranteed, and the mining efficiency can be guaranteed.

Description

Technical Field

[0001] The utility model relates to the field of sand control screen pipes, in particular to a sand control screen pipe for oilfield exploitation. Background Art

[0002] During the completion process of oil and gas wells, a string of pipes needs to be lowered into the well to transport fluids from underground formations to the ground. The string of pipes is connected with a screen pipe, and the screen pipe has a plurality of holes. When the fluid passes through the screen pipe, the particulate matter contained therein will be blocked by the screen pipe and will not enter the string of pipes.

[0003] According to the description in the sand control screen pipe disclosed on the patent network (the authorized announcement number is: CN 220505006 U), "The utility model relates to the field of completion tools, in particular to a sand control screen pipe, aiming to alleviate the technical problems of low sand interception accuracy and easy blockage of the screen pipe in the related art. The sand control screen pipe includes a base pipe and a protection pipe; the base pipe is provided with a first filtering slit penetrating through its side wall, the first filtering slit extends along the axial direction of the base pipe, and along the radial direction of the base pipe, its width gradually increases from outside to inside; there are multiple first filtering slits, and they are arranged in an array on the base pipe; the protection pipe is sleeved on the base pipe, and an annular space is formed between the protection pipe and the base pipe, and the first filtering slits are covered. The protection pipe is provided with a second filtering slit penetrating through its side wall, the second filtering slit extends along the axial direction of the protection pipe, and along the radial direction of the protection pipe, its width gradually increases from outside to inside; there are multiple second filtering slits, and they are arranged in an array on the protection pipe. Through the cooperation of the protection pipe and the base pipe, the sand interception accuracy of the sand control screen pipe is improved, the slit openings are not easily blocked, and the smooth flow of the fluid is ensured."

[0004] In view of the above description, the applicant believes that the following problems exist:

[0005] During the use of this utility model, since the device is protected by the protection pipe on the outermost layer and can be preliminarily filtered through the second filtering slit, when the screen pipe is lowered into the oil well, the protection pipe will contact the well wall and generate friction, which will cause the soil on the well wall to be scraped into the second filtering slit, resulting in the blockage of the second filtering slit and affecting the efficiency of fluid entry. Therefore, it is necessary to improve a sand control screen pipe for oilfield exploitation to solve the above problems. Summary of the Utility Model

[0006] In order to overcome the problem that when the screen pipe is lowered into the oil well, the protection pipe will contact the well wall and generate friction, which will cause the soil on the well wall to be scraped into the second filtering slit, resulting in the blockage of the second filtering slit.

[0007] The technical solution of the utility model is: a sand control screen pipe for oilfield exploitation, including a base pipe, and further including a protection pipe, a protection groove plate and a connection mechanism. The top and bottom of the base pipe are provided with a connection mechanism, the outside of the base pipe is provided with a protection pipe, and the inside of the protection pipe is fixedly connected with a protection groove plate, and the protection groove plate can prevent the blockage of sediment when the screen pipe is lowered.

[0008] Preferably, a plurality of base pipes are connected to each other through an external thread sleeve and an internal thread sleeve, and are protected by a protective groove plate and a protective pipe to prevent blockage caused by friction during installation. Then, sand and gravel are filtered through a trapezoidal filter seam and a filter layer, and thus the oil fluid is conveyed through the base pipes.

[0009] As a preference, eight liquid inlets are provided inside the base pipe, and the eight liquid inlets are evenly distributed inside the base pipe. The liquid enters evenly through the eight liquid inlets, increasing the liquid inlet area and improving the liquid inlet efficiency.

[0010] As a preference, a filter layer is fixedly connected to the outside of the base pipe, a filter plate is fixedly connected to the outside of the filter layer, a trapezoidal filter seam is provided inside the filter plate, a fixing ring is fixedly connected to the outside of the filter plate, and the protective pipe is fixedly connected inside the fixing ring. The protective groove plate is used for protection to prevent blockage during installation, and then filtration is carried out, which can effectively block the entry of sand and gravel and ensure the quality of filtration.

[0011] As a preference, a filter seam and a filter hole are provided inside the protective groove plate. While preventing blockage through the protective groove plate, oil can enter through the filter seam and filter hole provided in the protective groove plate.

[0012] As a preference, the trapezoidal filter seams are arranged in a staggered manner inside the filter plate. By the trapezoidal filter seams arranged in a staggered and uniform manner, the liquid inlet area is increased, the filtration efficiency can be improved, and the working speed can be accelerated.

[0013] As a preference, the connecting mechanism includes a first fixing ring, the first fixing ring is fixedly connected to the top of the base pipe, an external thread sleeve is fixedly connected to the top of the first fixing ring, a second fixing ring is fixedly connected to the bottom of the base pipe, and an internal thread sleeve is fixedly connected to the bottom of the second fixing ring. Through the cooperation of the external thread sleeve and the internal thread sleeve, a plurality of base pipes can be connected, and the installation is fast, increasing the working efficiency.

[0014] As a preference, the sizes of the external thread sleeve and the internal thread sleeve correspond to each other. The corresponding sizes enable the external thread sleeve and the internal thread sleeve to be connected in cooperation, and the external thread sleeve can be screwed into the inside of the internal thread sleeve for fixation.

[0015] The beneficial effects of the present utility model:

[0016] 1. When the protective pipe and the protective groove plate contact the well wall during installation, the filter seam of the protective groove plate is provided on the side surface, which can prevent scratching the inner wall of the oil well during installation to cause blockage, ensure the smoothness of the filter seam, and thus ensure the exploitation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic three-dimensional structure diagram of the present utility model;

[0018] Figure 2Schematic cross-sectional structure diagram of the present utility model;

[0019] Figure 3 Schematic exploded structure diagram of the present utility model;

[0020] Figure 4 Schematic cross-sectional structure diagram of the filter plate of the present utility model;

[0021] Figure 5 Schematic structure diagram of the protective tube and its connected components of the present utility model;

[0022] Figure 6 Schematic cross-sectional structure diagram of the protective groove plate of the present utility model;

[0023] Figure 7 Schematic structure diagram of the connecting mechanism of the present utility model.

[0024] Explanation of reference numerals: 1, base pipe; 21, filter layer; 22, filter plate; 23, trapezoidal filter slit; 24, fixing ring; 25, protective tube; 26, protective groove plate; 31, first fixing ring; 32, external thread sleeve; 33, second fixing ring; 34, internal thread sleeve. Detailed implementation manners

[0025] The present utility model will be further described below with reference to the accompanying drawings and embodiments.

[0026] Please refer to Figures 1 - 7 , the present utility model provides an embodiment: a sand control screen pipe for oilfield exploitation, including a base pipe 1, and further including a protective tube 25, a protective groove plate 26 and a connecting mechanism. Connecting mechanisms are provided at the top and bottom of the base pipe 1. A protective tube 25 is arranged outside the base pipe 1, and a protective groove plate 26 is fixedly connected inside the protective tube 25. The protective groove plate 26 can prevent sediment from blocking when lowering the screen pipe. Multiple base pipes 1 are connected to each other through the external thread sleeve 32 and the internal thread sleeve 34. The protective groove plate 26 and the protective tube 25 are used for protection to prevent blockage caused by friction during installation. Then, sand and gravel are filtered through the trapezoidal filter slit 23 and the filter layer 21, so that the oil liquid is transported through the base pipe 1. Eight liquid inlets are opened inside the base pipe 1, and the eight liquid inlets are evenly distributed inside the base pipe 1. Liquid enters evenly through the eight liquid inlets, increasing the liquid inlet area and improving the liquid inlet efficiency.

[0027] Please refer to Figures 1 - 6, in this embodiment, a filter layer 21 is fixedly connected to the outside of the base pipe 1, a filter plate 22 is fixedly connected to the outside of the filter layer 21, a trapezoidal filter slit 23 is formed inside the filter plate 22, a fixing ring 24 is fixedly connected to the outside of the filter plate 22, and a protective pipe 25 is fixedly connected inside the fixing ring 24. The protective groove plate 26 is used to prevent blockage during installation and then filter, which can effectively block the entry of sand and gravel and ensure the quality of filtration. Filter slits are formed inside the protective groove plate 26, and filter holes are formed inside the protective groove plate 26. While preventing blockage through the protective groove plate 26, oil can enter through the filter slits and filter holes formed in the protective groove plate 26. The trapezoidal filter slits 23 are arranged in a staggered manner inside the filter plate 22. By the staggered and evenly arranged trapezoidal filter slits 23, the liquid inlet area is increased, the filtration efficiency can be improved, and the working speed can be accelerated.

[0028] Please refer to Figure 1 , Figure 7 , in this embodiment, the connecting mechanism includes a first fixing ring 31, the first fixing ring 31 is fixedly connected to the top of the base pipe 1, an external thread sleeve 32 is fixedly connected to the top of the first fixing ring 31, a second fixing ring 33 is fixedly connected to the bottom of the base pipe 1, and an internal thread sleeve 34 is fixedly connected to the bottom of the second fixing ring 33. By the cooperation of the external thread sleeve 32 and the internal thread sleeve 34, multiple base pipes 1 can be connected, and the installation is fast, increasing the working efficiency. The sizes of the external thread sleeve 32 and the internal thread sleeve 34 correspond to each other. If the sizes correspond, the external thread sleeve 32 and the internal thread sleeve 34 can be cooperatively connected, and the external thread sleeve 32 can be screwed into the internal thread sleeve 34 for fixation.

[0029] During operation, by screwing the external thread sleeve 32 into the internal thread sleeve 34, multiple base pipes 1 can be connected, and the connection is stable, firm, and convenient. The protective pipe 25 contacts the wellbore wall with the protective groove plate 26. Oil enters between the fixing ring 24 and the protective pipe 25 through the filter slits and filter holes of the protective groove plate 26, and then the oil enters and passes through the trapezoidal filter slits 23 inside the filter plate 22 for filtration, and then is filtered by the filter layer 21. Then the oil enters the inside of the base pipe 1 through the liquid inlet of the base pipe 1, and thus the exploitation is completed.

[0030] Through the above steps, the filter slits of the protective groove plate are formed on the side, which can prevent scratching the inner wall of the oil well during installation and causing blockage, so as to solve the problem that when lowering the screen pipe into the oil well, the protective pipe will contact the wellbore wall and generate friction, which will cause the soil on the wellbore wall to be scraped into the second filter slit, resulting in the blockage of the second filter slit.

Claims

1. A sand control screen pipe for oil field development, comprising a base pipe (1), characterized in that: The invention also comprises a protection pipe (25), a protection slot plate (26) and a connection mechanism. The connection mechanism is arranged at the top and the bottom of the base pipe (1). The protection pipe (25) is arranged outside the base pipe (1). The protection slot plate (26) is fixedly connected inside the protection pipe (25). The protection slot plate (26) can prevent the silt from blocking when the screen pipe is lowered.

2. The sand control screen for oil field development according to claim 1, characterized in that: Eight liquid inlets are provided inside the base tube (1), and the eight liquid inlets are evenly distributed inside the base tube (1).

3. The sand control screen for oil field development according to claim 1, characterized in that: The outside of the base pipe (1) is fixedly connected to a filter layer (21), the outside of the filter layer (21) is fixedly connected to a filter plate (22), the inside of the filter plate (22) is provided with a trapezoidal filter slit (23), the outside of the filter plate (22) is fixedly connected to a fixing ring (24), and the protection pipe (25) is fixedly connected to the inside of the fixing ring (24).

4. The sand control screen for oil field development according to claim 3, characterized in that: A filtering slit is provided inside the protection slot plate (26), and a filtering hole is provided inside the protection slot plate (26).

5. The sand control screen for oil field development according to claim 3, characterized in that: The trapezoidal filtering slits (23) are arranged in a staggered manner inside the filtering plate (22).

6. The sand control screen for oil field development according to claim 1, characterized in that: The connection mechanism comprises a first fixing ring (31), the first fixing ring (31) is fixedly connected to the top of the base pipe (1), the top of the first fixing ring (31) is fixedly connected to an external threaded sleeve (32), the bottom of the base pipe (1) is fixedly connected to a second fixing ring (33), and the bottom of the second fixing ring (33) is fixedly connected to an internal threaded sleeve (34).

7. The sand control screen for oil field development according to claim 6, characterized in that: The sizes of the external thread sleeve (32) and the internal thread sleeve (34) correspond to each other.

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