Graded well cementation type well repair sand prevention device suitable for long-section casing patching

Abstract

The invention belongs to the technical field of graded well cementation, well repair and sand prevention, and provides a graded well cementation type well repair and sand prevention device suitable for long-section casing patching, the graded well cementation type well repair and sand prevention device comprises a casing, a slotted screen pipe and an electric telescopic rod, a cement loader is installed in the casing, the bottom of the casing is fixedly connected with the slotted screen pipe, and the slotted screen pipe is fixedly connected with the electric telescopic rod. The electric telescopic rod is arranged in the slotted screen pipe, and a cleaning assembly is arranged at the bottom of the hydraulic cylinder. The annular degradable plate is supported through the stop blocks and the connecting rods, cement is prevented from entering an unfixed area, and the cement is prevented from polluting an oil outlet layer at the bottom; the lifting disc is driven by the supporting block to move towards the direction of the electric telescopic rod, and meanwhile, the connecting rod pulls the stopping block to move into the sleeve, so that the circular-ring-shaped degradable plate is separated from the stopping block, and then the stopping block is recycled into the sleeve.

Description

Technical Field

[0001] The invention belongs to the technical field of graded cementing, well repair and sand prevention, and in particular is a graded cementing, well repair and sand prevention device suitable for long-section casing patching. Background Art

[0002] my country's loose sandstone reservoirs have a large distribution range, large reserves, and an important production position. Under general mining conditions (except for heavy oil using new cold mining technology with sand removal), sand production in oil wells is extremely harmful. In order to prevent sand production in oil wells, on the one hand, it is necessary to correctly select cementing and completion methods according to the oil layer and oil well conditions, formulate reasonable mining measures, control production pressure difference, limit seepage rate, strengthen the management of oil wells in sand layers, and try to avoid strong pumping and inducing flow measures; on the other hand, according to the requirements of the oil layer and mining process, adopt corresponding sand control process technology to ensure the normal production of oil wells; sand production in oil and gas wells is one of the important problems encountered in oil production. If the sand damage is not controlled, the sand production in oil and gas wells will become more and more serious, resulting in the inability to effectively develop sand oil and gas wells. The hazards of sand production are mainly manifested in the following three aspects: serious abrasion of ground and underground equipment, and even sand jam; a sharp increase in maintenance work such as sand flushing and pump inspection, ground tank cleaning, etc.; sand burying the oil layer or sand blocking the wellbore will cause the oil well to stop production; serious sand production will cause the well wall and oil layer to collapse, thereby damaging the casing and causing the oil well to be scrapped. These hazards not only increase the production cost of crude oil, but also increase the difficulty of oil field exploitation.

[0003] The existing technology usually uses drilling plugs to clean up and restore the normal flow channel of the fluid in the wellbore. However, the drilling plug process is relatively time-consuming, which will affect the operating efficiency and generate debris. If it is not handled properly, it may cause new blockages or other hidden dangers.

[0004] In summary, the present invention provides a graded cementing well repair and sand control device suitable for long-section casing patching to solve the above problems. Summary of the invention

[0005] The invention provides a graded cementing type well repair and sand prevention device suitable for long-section casing patching to solve the problems existing in the background technology.

[0006] The technical solution of the present invention is as follows:

[0007] A graded cementing well repair and sand control device suitable for long-section casing patching comprises: a casing, a slotted screen pipe and an electric telescopic rod, wherein a cement carrier is installed in the casing, the slotted screen pipe is fixedly connected to the bottom of the casing, the electric telescopic rod is arranged in the slotted screen pipe, and a cleaning component is arranged at the bottom of the electric telescopic rod.

[0008] Furthermore, the cement carrier includes a lifting plate and a connecting rod, the connecting rod is rotatably connected to the lifting plate, and one end of the connecting rod away from the lifting plate is fixedly connected to a blocking block for supporting the annular degradable plate.

[0009] Furthermore, the slotted screen pipe comprises a shell and screen holes, wherein the screen holes are opened on the shell, a push block is arranged outside the screen hole, and the sleeve and the push block are connected via a coil spring.

[0010] Furthermore, the size of the push block is the same as that of the sieve hole, and the push block is in a triangular shape, but the side facing the sieve hole is arc-shaped, so that the corner tip of the side triangle is sharper.

[0011] Furthermore, a cylinder 1 is fixedly connected to the inner tube of the electric telescopic rod, and a sleeve 1 is slidably connected to one end of the cylinder 1 away from the inner tube of the electric telescopic rod, and a spring 1 is fixedly connected to one end of the sleeve 1, and an end of the spring 1 away from the sleeve 1 is fixedly connected to the inner tube of the electric telescopic rod, and a cylinder 2 is slidably connected to a surface of the inner tube of the electric telescopic rod opposite to the cylinder 1, and a support block is fixedly connected to one end of the cylinder 2 away from the inner tube of the electric telescopic rod, and the support block is fixedly connected to the lifting plate.

[0012] Furthermore, the cleaning assembly includes a second sleeve, a fixed plate and a second spring, one end of the second sleeve is connected to the electric telescopic rod, the fixed plate is fixedly connected to the other end of the second sleeve, a cavity is provided inside the fixed plate, one end of the second spring is fixedly connected in the cavity, the other end of the second spring is fixedly connected to a telescopic block, the bottom of the fixed plate is slidably connected to a shell, a push plate is slidably connected inside the shell, the push plate is fixedly connected to the inner tube of the electric telescopic rod, and a foam plate is connected to a side of the push plate away from the fixed plate.

[0013] Furthermore, a V-shaped groove is provided on the second sleeve, and a vertical groove is provided in the second sleeve on one side of the V-shaped groove.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. The present invention supports the annular degradable plate through the blocking block and the connecting rod, thereby preventing cement from entering the unfixed area and preventing cement from polluting the oil-producing layer at the bottom; and drives the lifting plate to move toward the electric telescopic rod through the supporting block, while the connecting rod pulls the blocking block to move into the casing, so that the annular degradable plate is separated from the blocking block, and then the blocking block is recovered in the casing.

[0016] 2. When the shell of the present invention contacts the bottom of the slotted screen tube, the fixed plate and the second sleeve cannot move downward any further. At this time, the inner tube of the electric telescopic rod pushes the push plate downward and drives the foam plate to embed sand into the foam plate. At the same time, the first sleeve slides toward the end of the V-shaped groove along the vertical groove track inside the second sleeve. At this time, the first spring loses pressure and pops out, and pushes the first sleeve to extend out of the second sleeve. The staff controls the electric telescopic rod to retract a part, and then continues to control the electric telescopic rod to extend, so that the first sleeve slides in the V-shaped groove and drives the push block to rotate 90 degrees, and embeds another part of the sand at the bottom of the slotted screen tube into the foam plate, so that the sand at the bottom of the slotted screen tube is completely cleaned up. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a stereogram of the device of the present invention;

[0018] Figure 2 It is the internal structure diagram of the device of the present invention;

[0019] Figure 3 is a cross-sectional view of the device of the present invention;

[0020] Figure 4 This is a structural diagram of the electric telescopic rod of the device of the present invention;

[0021] Figure 5 is a cross-sectional view of a cleaning assembly of the device of the present invention;

[0022] Figure 6 The present invention Figure 4 Enlarged view of point A in the middle.

[0023] In the figure:

[0024] 1. Casing; 2. Cement carrier; 21. Lifting plate; 22. Connecting rod; 23. Blocking block; 3. Slit screen tube; 31. Shell; 32. Sieve hole; 33. Push block; 4. Electric telescopic rod; 41. Cylinder 1; 42. Sleeve 1; 43. Spring 1; 44. Cylinder 2; 45. Support block; 5. Cleaning assembly; 51. Sleeve 2; 52. Fixed plate; 53. Spring 2; 54. Telescopic block; 55. Shell; 56. Push plate; 57. Foam board. DETAILED DESCRIPTION

[0025] The following embodiments of the present invention are described in further detail in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0026] like Figure 1-6As shown, a graded cementing well repair and sand control device suitable for long-section casing patching includes: a casing 1, a slotted screen 3 and an electric telescopic rod 4, a cement carrier 2 is installed in the casing 1, the slotted screen 3 is fixedly connected to the bottom of the casing 1, the electric telescopic rod 4 is arranged in the slotted screen 3, and a cleaning component 5 is arranged at the bottom of the electric telescopic rod 4.

[0027] As an embodiment of the present invention, the cement carrier 2 includes a lifting plate 21 and a connecting rod 22, the connecting rod 22 is rotatably connected to the lifting plate 21, and one end of the connecting rod 22 away from the lifting plate 21 is fixedly connected with a blocking block 23, which is used to support the annular biodegradable plate to prevent cement from entering the unfixed area and polluting the oil layer.

[0028] As an embodiment of the present invention, the slotted screen pipe 3 includes a shell 31 and a screen hole 32. The screen hole 32 is opened on the shell 31. A push block 33 is arranged outside the screen hole 32. The casing 1 and the push block 33 are connected by a coil spring.

[0029] As an embodiment of the present invention, the size of the push block 33 is the same as the size of the sieve hole 32, and the push block 33 is triangular in shape, but the side facing the sieve hole 32 is arc-shaped, so that the corner tip of the side triangle is sharper, which facilitates the push block 33 to clean the sieve hole 32.

[0030] As an embodiment of the present invention, a cylinder 41 is fixedly connected to the inner tube of the electric telescopic rod 4, and a sleeve 42 is slidably connected to one end of the cylinder 41 away from the inner tube of the electric telescopic rod 4, and a spring 43 is fixedly connected to one end of the sleeve 42, and an end of the spring 43 away from the sleeve 42 is fixedly connected to the inner tube of the electric telescopic rod 4, and a cylinder 2 44 is slidably connected to the side of the inner tube of the electric telescopic rod 4 opposite to the cylinder 41, and a support block 45 is fixedly connected to one end of the cylinder 2 44 away from the inner tube of the electric telescopic rod 4, and the support block 45 is fixedly connected to the lifting plate 21.

[0031] As an embodiment of the present invention, the cleaning assembly 5 includes a sleeve 51, a fixed plate 52 and a spring 53, one end of the sleeve 51 is connected to the electric telescopic rod 4, the fixed plate 52 is fixedly connected to the other end of the sleeve 51, a cavity is provided inside the fixed plate 52, one end of the spring 53 is fixedly connected in the cavity, the other end of the spring 53 is fixedly connected to a telescopic block 54, the bottom of the fixed plate 52 is slidably connected to a shell 55, a push plate 56 is slidably connected inside the shell 55, the push plate 56 is fixedly connected to the inner tube of the electric telescopic rod 4, and the push plate 56 is connected to a foam plate 57 on the side away from the fixed plate 52.

[0032] As an implementation mode of the present invention, a V-shaped groove is provided on the second sleeve 51 , and a vertical groove is provided in the second sleeve 51 on one side of the V-shaped groove.

[0033] Specific working principle:

[0034] First, if Figure 2-3 As shown, the staff first places an annular degradable plate on each blocking block 23, so that the upper half of the blocking block 23 is embedded in the annular degradable plate. At this time, the blocking plate 23 located at the upper third of the connecting rod 22 blocks the hole on the sleeve 1, so that the device is in a sealed state, and the plate can completely fit the sleeve 1 and the well wall. Then the staff puts the device into the well. When it reaches the designated position, the staff starts to pour cement into the wellbore. At this time, the cement is blocked by the annular degradable plate. The blocking block 23 and the connecting rod 22 support the annular degradable plate to prevent cement from entering the unfixed area and prevent cement from polluting the bottom oil-producing layer.

[0035] Then, if Figure 3-6As shown, after the device has been running for a period of time, some sand will accumulate at the bottom of the slotted screen tube 3, and sand may accumulate inside the screen hole 32, which makes the use effect of the screen hole 32 poor. At this time, the staff starts the electric telescopic rod 4, the inner tube of the electric telescopic rod 4 extends, and pushes the fixed plate 52 to move to the bottom of the slotted screen tube 3. When the fixed plate 52 moves to the position of the push block 33, the push block 33 is pushed to rotate to the outside of the casing 1. Since the end of the push block 33 is sharp, it is convenient to push away the sand in the screen hole 32 and clean the inside of the screen hole 32; at the same time, when the telescopic block 54 contacts the coil spring between the casing 1 and the push block 33, it retracts inward and compresses the spring 2 53. When the fixed plate 52 passes through the push block 33, the spring 2 53 loses its restricted rebound and pushes the telescopic block 54 out, so that the telescopic block 54 contacts the inner wall of the casing 1; when the shell 55 When it contacts the bottom of the slotted screen tube 3, the fixed plate 52 and the second sleeve 51 cannot move further downward. At this time, the inner tube of the electric telescopic rod 4 pushes the push plate 56 to move downward, and drives the foam plate 57 to contact the sand settled at the bottom of the slotted screen tube 3, and embeds the sand into the foam plate 57 during the downward pressing process. At the same time, the sleeve 1 42 slides toward the end of the V-shaped groove along the vertical groove track inside the second sleeve 51. At this time, the spring 1 43 loses pressure and pops out, and pushes the sleeve 1 42 to extend out of the second sleeve 51. The staff controls the electric telescopic rod 4 to retract a part, and then continues to control the electric telescopic rod 4 to extend, so that the sleeve 1 42 slides in the V-shaped groove and drives the push block 33 to rotate 90 degrees, and embeds another part of the sand at the bottom of the slotted screen tube 3 into the foam plate 57, so that the sand at the bottom of the slotted screen tube 3 is completely cleaned up.

[0036] like Figure 2-6 As shown, it should be noted that: when the electric telescopic rod 4 is started, the second cylinder 44 pulls the support block 45 and drives the lifting plate 21 to move toward the electric telescopic rod 4, and at the same time the connecting rod 22 pulls the blocking block 23 to move into the sleeve 1, so that the annular biodegradable plate is separated from the blocking block 23, and then the blocking block 23 is recovered in the sleeve 1.

[0037] The embodiments of the present invention are provided for the purpose of illustration and description. Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A graded cementing well repair and sand control device suitable for long-section casing patching, comprising: A casing (1), a slotted screen tube (3) and an electric telescopic rod (4), characterized in that a cement carrier (2) is installed in the casing (1), the bottom of the casing (1) is fixedly connected with a slotted screen tube (3), the electric telescopic rod (4) is arranged in the slotted screen tube (3), and a cleaning component (5) is arranged at the bottom of the electric telescopic rod (4).

2. A graded cementing well repair and sand control device suitable for long-section casing patching as claimed in claim 1, characterized in that: The cement carrier (2) comprises a lifting plate (21) and a connecting rod (22), wherein the connecting rod (22) is rotatably connected to the lifting plate (21), and a blocking block (23) is fixedly connected to one end of the connecting rod (22) away from the lifting plate (21).

3. A graded cementing well repair and sand control device suitable for long-section casing (1) repair as claimed in claim 1, characterized in that: The slotted screen pipe (3) comprises an outer shell (31) and a screen hole (32), wherein the screen hole (32) is opened on the outer shell (31), a push block (33) is arranged outside the screen hole (32), and the casing (1) and the push block (33) are connected via a coil spring.

4. A graded cementing well repair and sand control device suitable for long-section casing (1) repair as claimed in claim 3, characterized in that: The size of the push block (33) is the same as the size of the sieve hole (32), and the push block (33) is triangular in shape, but the side facing the sieve hole (32) is arc-shaped.

5. A graded cementing well repair and sand control device suitable for long-section casing (1) repair as claimed in claim 1, characterized in that: A cylinder (41) is fixedly connected to the inner tube of the electric telescopic rod (4); an end of the cylinder (41) away from the inner tube of the electric telescopic rod (4) is slidably connected to a sleeve (42); one end of the sleeve (42) is fixedly connected to a spring (43); an end of the spring (43) away from the sleeve (42) is fixedly connected to the inner tube of the electric telescopic rod (4); a cylinder (44) is slidably connected to a surface of the inner tube of the electric telescopic rod (4) opposite to the cylinder (41); an end of the cylinder (44) away from the inner tube of the electric telescopic rod (4) is fixedly connected to a support block (45); and the support block (45) is fixedly connected to the lifting plate (21).

6. A graded cementing well repair and sand control device suitable for long-section casing (1) repair as claimed in claim 1, characterized in that: The cleaning assembly (5) comprises a second sleeve (51), a fixing plate (52) and a second spring (53); one end of the second sleeve (51) is connected to the electric telescopic rod (4); the fixing plate (52) is fixedly connected to the other end of the second sleeve (51); a cavity is provided inside the fixing plate (52); one end of the second spring (53) is fixedly connected in the cavity; the other end of the second spring (53) is fixedly connected to a telescopic block (54); a housing (55) is slidably connected to the bottom of the fixing plate (52); a push plate (56) is slidably connected inside the housing (55); the push plate (56) is fixedly connected to the inner tube of the electric telescopic rod (4); and a foam plate (57) is connected to a side of the push plate (56) away from the fixing plate (52).

7. A graded cementing well repair and sand control device suitable for long-section casing (1) repair as claimed in claim 6, characterized in that: The second sleeve (51) is provided with a V-shaped groove, and the second sleeve (51) is provided with a vertical groove on one side of the V-shaped groove.

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