Novel sand control screen pipe

Abstract

The utility model discloses a novel sand control screen which comprises an inner-layer assembly, a middle-layer assembly is arranged on the surface of the inner-layer assembly, an outer-layer assembly is arranged on the surface of the middle-layer assembly, and an end cover is arranged between the outer-layer assembly and the inner-layer assembly. The middle-layer assembly comprises a sieve tube arranged on the inner-layer assembly, a plurality of groups of slots distributed at equal intervals are formed in the surface of the sieve tube in the axial direction of the sieve tube, a plurality of slots are annularly distributed at equal intervals in each group by taking the central axis of the sieve tube as the axis, and a spiral steel sheet is fixedly connected to the surface of the sieve tube; according to the novel sand control screen pipe, the inner layer assembly, the middle layer assembly and the outer layer assembly form the novel sand control screen pipe, the screen pipe, the kerfs and the spiral steel sheets form the middle layer assembly, erosion of gravels to the inner layer assembly and the middle layer assembly is reduced, erosion of the gravels in screen holes is also reduced, and the sand control effect is improved; the problems that under the conditions of high pressure difference and high sand content, screen holes of an existing sand control screen pipe are prone to being blocked, and sand control fails are solved.

Description

Technical Field

[0001] This utility model relates to the field of oil extraction technology, and in particular to a novel sand-control screen pipe. Background Technology

[0002] Sand control refers to measures taken during oil production to correctly select cementing and completion methods, formulate reasonable extraction measures, control production pressure differentials, and limit seepage velocity to prevent sand blockage, based on the conditions of the oil layer and well.

[0003] While existing sand control screens can prevent formation sand particles from entering the wellbore to a certain extent, sand particles may still accumulate on the outside of the screen under conditions of high sand content formations or high pressure differentials, causing screen hole blockage or screen hole damage, resulting in sand control failure and affecting the sand control effect and normal production of oil and gas wells.

[0004] Therefore, a new type of sand-proof screen pipe is proposed. Utility Model Content

[0005] The purpose of this invention is to provide a novel sand-proof screen pipe to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the main technical solutions adopted by this utility model include:

[0007] A new type of sand-control screen pipe includes:

[0008] An inner component has a middle component on its surface, an outer component on the surface of the middle component, and an end cap between the outer component and the inner component;

[0009] The middle layer component includes a screen tube disposed on the inner layer component. The surface of the screen tube has several sets of equally spaced slits along its axial direction. Each set of slits has several equidistant slits arranged in a ring around the central axis of the screen tube. Spiral steel sheets are fixedly connected to the surface of the screen tube.

[0010] As a preferred technical solution, the inner layer component includes a base tube, the surface of which is provided with several groups of through holes that are equidistantly distributed. Each group of through holes is provided with several holes that are equidistantly distributed in a ring around the central axis of the base tube, and the screen tube is sleeved on the surface of the base tube.

[0011] As a preferred technical solution, the number of slit groups is greater than the number of through-hole groups, and the number of through-holes in each group is the same as the number of slit groups.

[0012] As a preferred technical solution, the slit is configured as an elongated strip structure, and the through hole is configured as a circular hole structure.

[0013] As a preferred technical solution, the outer component includes a sleeve fitted on the screen tube, with an annular cavity formed between the sleeve and the base tube. The inner wall of the sleeve is in contact with the spiral steel sheet. One end of the sleeve surface is provided with several groups of liquid inlet holes that are equidistantly distributed. Each group of liquid inlet holes is provided with several holes that are equidistantly distributed in an annular shape with the central axis of the sleeve as the axis.

[0014] As a preferred technical solution, the end cap is threaded onto the surface of the base tube, and one end of the base tube is integrally formed with a joint that is opposite to the end cap. The two ends of the sleeve are threadedly connected to the end cap and the base tube, respectively.

[0015] As a preferred technical solution, the surface of one end of the base tube is provided with an external thread, and the inner wall surface of the joint is provided with an internal thread that mates with the external thread.

[0016] This utility model has at least the following beneficial effects:

[0017] This application describes a novel sand-proof screen tube composed of an inner layer component, a middle layer component, and an outer layer component. The middle layer component, consisting of a screen tube, slits, and spiral steel sheets, reduces the erosion of the inner and middle layer components by sand and gravel, as well as the erosion of the screen holes, thereby improving the sand-proof effect. This addresses the problem of easy clogging and sand-proof failure of existing sand-proof screen tubes under high pressure differential and high sand content conditions. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the sand-proof screen pipe of this utility model;

[0019] Figure 2 This is a schematic diagram of the main sectional view of the sand-proof screen pipe of this utility model;

[0020] Figure 3 This is an exploded view of the middle and outer components of the sand-proof screen pipe of this utility model;

[0021] Figure 4 This is an exploded view of the inner and middle layer components of the sand-proof screen pipe of this utility model.

[0022] In the diagram: 100, inner layer assembly; 110, base tube; 111, connector; 120, through hole; 200, middle layer assembly; 210, screen tube; 220, slit; 230, spiral steel sheet; 300, outer layer assembly; 310, sleeve; 320, liquid inlet; 400, end cap. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Please see Figures 1-4 This utility model provides a novel sand-proof screen pipe, including an inner layer component 100, a middle layer component 200, an outer layer component 300, and an end cap 400. The middle layer component 200 and the outer layer component 300 are arranged sequentially from the inside to the outside on the surface of the inner layer component 100, and the end cap 400 is arranged between the inner layer component 100 and the outer layer component 300. The middle layer component 200 includes a screen pipe 210 arranged on the inner layer component 100. The surface of the screen pipe 210 has several sets of equally spaced slits 220 along its axial direction. Each set of slits 220 is arranged in a ring with several equidistant slits around the central axis of the screen pipe 210. A spiral steel sheet 230 is fixedly connected to the surface of the screen pipe 210.

[0025] The inner component 100 includes a base tube 110, and the surface of the base tube 110 is provided with several sets of through holes 120 that are equidistantly distributed. Each set of through holes 120 is provided with several through holes in a ring equidistant from the central axis of the base tube 110. The screen tube 210 is sleeved on the surface of the base tube 110.

[0026] Among them, the number of groups of slits 220 is greater than the number of groups of through holes 120, and the number of through holes 120 in each group is the same as the number of slits 220 in each group.

[0027] The slit 220 is designed in a long strip shape, and the through hole 120 is designed in a round hole shape.

[0028] The outer component 300 includes a sleeve 310 fitted onto the screen tube 210. An annular cavity is formed between the sleeve 310 and the base tube 110. The inner wall of the sleeve 310 is in contact with the spiral steel sheet 230. A number of equidistant liquid inlet holes 320 are provided at one end of the surface of the sleeve 310. Each group of liquid inlet holes 320 is equidistantly distributed in an annular shape with the central axis of the sleeve 310 as the center. A liquid flow channel is formed between the liquid inlet holes 320, the annular cavity, the slit 220, the through hole 120 and the base tube 110.

[0029] The end cap 400 is threaded onto the surface of the base tube 110, and one end of the base tube 110 is integrally formed with a connector 111 that is opposite to the end cap 400. The two ends of the sleeve 310 are threadedly connected to the end cap 400 and the base tube 110 respectively. Through the cooperation of the connector 111 and the end cap 400, the two ends of the annular cavity can be sealed to ensure that the separated clean liquid enters the base tube 110.

[0030] The base tube 110 has an external thread on one end, and the inner wall of the connector 111 has an internal thread that mates with the external thread. The number of the new sand screen tubes can be determined according to the actual use. The end of the base tube 110 on the inner layer component 100 can be threaded into the connector 111 on the adjacent inner layer component 100 to meet the length requirements of the sand screen column.

[0031] The working principle of this utility model is as follows: the liquid flows into the annular cavity between the base tube 110 and the sleeve 310 through the liquid inlet 320. Under the action of pressure difference and gravity, it passes through the spiral steel plate 230. At this time, the liquid generates centrifugal force through rotation. Under the action of centrifugal force, the sand particles in the liquid move downward along the outside of the annular cavity. The clean liquid after separation enters the base tube 110 through the slit 220 and the through hole 120 in sequence. This process reduces the erosion of the inner layer component 100 and the middle layer component 200 by sand and gravel, and also reduces the erosion of sand and gravel in the screen holes, thus improving the sand prevention effect.

[0032] All parts not described in this utility model are the same as or can be implemented using existing technology. Although embodiments of this utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this utility model, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A novel sand-proof screen pipe, characterized in that, include: An inner component (100) has a middle component (200) on its surface, and an outer component (300) is provided on the surface of the middle component (200). An end cap (400) is provided between the outer component (300) and the inner component (100). The middle layer assembly (200) includes a screen tube (210) disposed on the inner layer assembly (100). The surface of the screen tube (210) is provided with a number of equally spaced slits (220) along its axial direction. Each group of slits (220) is arranged in a ring with the central axis of the screen tube (210) as the center. A spiral steel sheet (230) is fixedly connected to the surface of the screen tube (210).

2. The novel sand-proof screen pipe according to claim 1, characterized in that: The inner layer component (100) includes a base tube (110), and the surface of the base tube (110) is provided with a number of equidistant through holes (120). Each group of through holes (120) is equidistantly distributed in a ring around the central axis of the base tube (110), and the screen tube (210) is sleeved on the surface of the base tube (110).

3. The novel sand-proof screen pipe according to claim 2, characterized in that: The number of groups of slits (220) is greater than the number of groups of through holes (120), and the number of through holes (120) in each group is the same as the number of slits (220) in each group.

4. The novel sand-proof screen pipe according to claim 3, characterized in that: The slit (220) is arranged in a long strip shape, and the through hole (120) is arranged in a round hole shape.

5. The novel sand-proof screen pipe according to claim 4, characterized in that: The outer component (300) includes a sleeve (310) fitted onto the screen tube (210). An annular cavity is formed between the sleeve (310) and the base tube (110). The inner wall of the sleeve (310) is in contact with the spiral steel sheet (230). A number of equidistant liquid inlet holes (320) are provided at one end of the surface of the sleeve (310). Each group of liquid inlet holes (320) is equidistantly distributed in an annular shape with the central axis of the sleeve (310) as the center.

6. The novel sand-proof screen pipe according to claim 5, characterized in that: The end cap (400) is threaded onto the surface of the base tube (110), and one end of the base tube (110) is integrally formed with a connector (111) that is opposite to the end cap (400). The two ends of the sleeve (310) are threadedly connected to the end cap (400) and the base tube (110) respectively.

7. The novel sand-proof screen pipe according to claim 6, characterized in that: The surface of one end of the base tube (110) is provided with an external thread, and the inner wall surface of the connector (111) is provided with an internal thread that mates with the external thread.

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