Intelligent fracturing sliding sleeve with spirally distributed sand blasting holes

Abstract

The utility model relates to the technical field of fracturing sliding sleeves, in particular to an intelligent fracturing sliding sleeve with spirally distributed sand blasting holes. Comprising an outer cylinder body, at least two rows of fracturing holes are formed in the outer cylinder body in the axis direction of the outer cylinder body, each row of fracturing holes are circumferentially and evenly distributed in the outer wall of the outer cylinder body, and any two adjacent rows of fracturing holes are formed in a staggered mode. Every two adjacent fracturing holes in any two adjacent rows are located on a virtual spiral line, and the axis of the spiral line coincides with the axis of the outer cylinder body. Fracturing holes are spirally arranged according to a phase angle, the axial distribution distance is longer, a radial porous matrix is adopted, and the influence that local cement consolidation strength or stratum rock strength hinders fracture forming can be counteracted during fracturing. And the operation is repeated, the intelligent label is pumped, anchoring and setting are conducted, the upper-stage sliding sleeve is opened, and step-by-step fracturing is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to fracturing sliding sleeve technical field more specifically relates to a sand blasting hole helical distribution type intelligent fracturing sliding sleeve. BACKGROUND

[0002] Most of the oil and gas field development in China has entered the middle and late period, and most of the remaining oilfield blocks are difficult to develop, and the downhole working condition is complex. In order to further improve the development yield of oil and gas field, the demand for fracturing is more and more strong, the scale is more and more large, the fracturing layer is more and more increased year by year, and the fracturing effect of downhole intelligent fracturing tool is more and more high. Intelligent tag sliding sleeve fracturing tool can well complete fracturing and fracture forming. Because the downhole working condition is complex, when the intelligent tag is opened, the intelligent fracturing sliding sleeve is opened, the fracturing hole is conducted, at this time, the fracturing hole will be hindered by the downhole formation rock, solid cement and other obstacles, which will affect the fracturing effect. UTILITY MODEL CONTENT

[0003] The utility model provides a sand blasting hole helical distribution type intelligent fracturing sliding sleeve, which can offset the influence of local cement consolidation strength or formation rock strength on fracture forming.

[0004] The above-mentioned purpose is realized by the following technical scheme:

[0005] A fracturing sliding sleeve outer cylinder comprises an outer cylinder body, a fracturing hole is arranged on the outer cylinder body, the axis of the fracturing hole is perpendicular to the axis of the outer cylinder body, the fracturing hole is distributed along at least one spiral line, and the axis of the spiral line coincides with the axis of the outer cylinder body.

[0006] When at least two spiral lines are distributed, the circumferential distribution of each row of fracturing holes is on the outer wall of the outer cylinder body.

[0007] The spacing of two adjacent rows of fracturing holes on the axis is between 1.1 times and 5 times the diameter of the fracturing hole.

[0008] The included angle between the axes of two adjacent fracturing holes on the spiral line is 30° to 70°.

[0009] The diameter of the fracturing hole ranges from 10 mm to 50 mm, the number of the fracturing holes in a single circumferential row is 1 to 7, and there are 2 to 5 rows in the axial direction.

[0010] A sand blasting hole helical distribution type intelligent fracturing sliding sleeve comprises a fracturing sliding sleeve outer cylinder, a clamping device fixed to the outer cylinder body, an inner cylinder slidingly connected in the outer cylinder body, the clamping device clamped on the inner cylinder, and the inner cylinder blocking the fracturing hole.

[0011] The locking device is a shear pin, one end of which is screwed into the outer cylinder body, and the inner cylinder is provided with a locking groove, and the other end of the shear pin is locked in the locking groove.

[0012] The outer cylinder body is provided with a connecting cylinder at each of the left and right ends, and each of the two connecting cylinders is provided with a joint at the end away from the other, the outer cylinder body, the connecting cylinder and the joint are coaxially arranged, the inner diameters of the outer cylinder body and the two connecting cylinders are the same, the inner wall of the joint protrudes from the inner wall of the connecting cylinder, and after the inner cylinder is separated from the locking device, the inner cylinder can be locked on the joint in the advancing direction, and at this time, the fracturing hole is in an open state.

[0013] The inner cylinder is provided with a positioning module mounting groove, and the positioning module mounting groove is provided with a positioning module fixed to the inner cylinder.

[0014] The intelligent tag can identify the positioning module, and when it is identified as a target sandblasting hole spiral distributed intelligent fracturing sliding sleeve, the intelligent tag is anchored and set on the inner wall of the inner cylinder, under the action of the wellhead pump pressure, the intelligent tag pushes the inner cylinder to move, the locking device is no longer locked, and the fracturing hole is exposed.

[0015] The sandblasting hole spiral distributed intelligent fracturing sliding sleeve has the following beneficial effects:

[0016] The fracturing holes are arranged in a spiral according to the phase angle, the axial distribution distance is longer, and the radial porous matrix can offset the local cement consolidation strength or the formation rock strength to hinder the fracturing effect. Repeating the above operation, pumping the intelligent tag, anchoring and setting the opening of the upper sliding sleeve, and realizing step-by-step fracturing. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 A schematic view showing that the fracturing holes of the fracturing sliding sleeve outer cylinder are distributed along a spiral line is shown;

[0018] Figure 2 A schematic view showing that the fracturing sliding sleeve is in an open state is shown; Figure 1 An enlarged view of the middle A is shown;

[0019] Figure 3 A sectional view of the sandblasting hole spiral distributed intelligent fracturing sliding sleeve is shown;

[0020] Figure 4 An enlarged view of the middle B is shown; Figure 3

[0021] Figure 5 A structural schematic view of the inner cylinder is shown;

[0022] Figure 6 A schematic view showing that the fracturing sliding sleeve cooperates with the intelligent tag in an initial state is shown;

[0023] Figure 7 A schematic view showing that the fracturing sliding sleeve is in an open state is shown;​

[0024] Figure 8 A schematic diagram showing the fracture hole of the fracturing sliding sleeve outer cylinder is distributed along multiple spiral lines.

[0025] In the figure: 1-1, outer cylinder body; 1-2, fracture hole; 1-2a, patch mounting hole; 1-2b, patch; 1-3, retainer; 1-4, connecting cylinder; 1-5, joint; 2-1, inner cylinder; 2-2, positioning module mounting slot; 2-3, clamping groove; 2-4, positioning module; 3, intelligent tag. DETAILED DESCRIPTION

[0026] A fracturing sliding sleeve outer cylinder, such as Figures 1 to 4 , comprises an outer cylinder body 1-1, and a fracture hole 1-2 is arranged on the outer cylinder body 1-1, the fracture hole 1-2 is arranged in multiple rows along the axial direction of the outer cylinder body 1-1, when the number of each row of fracture holes 1-2 is one, all the fracture holes 1-2 are on one spiral line, thereby forming one spiral line distribution, the axis of the spiral line coincides with the axis of the outer cylinder body 1-1.

[0027] In combination Figure 8 , the spiral line distribution can also be increased to 2 to 7 in the radial direction according to specific conditions. When the number of each row of fracture holes 1-2 is two or more, each row of fracture holes 1-2 is circumferentially distributed on the outer wall of the outer cylinder body 1-1, and any two adjacent rows of fracture holes 1-2 are staggered.

[0028] Specifically, the axial spacing between the two rows of fracture holes 1-2 is between 1.1 times and 5 times the diameter of the fracture hole, and the axial angle between two adjacent fracture holes 1-2 on the spiral line is 30° to 70°.

[0029] Preferably, the fracture hole 1-2 is a countersunk hole, forming a fracture hole groove, and the outer cylinder body 1-1 is provided with a patch mounting hole 1-2a located in the fracture hole 1-2 for a fastener to be screwed in, and a patch 1-2b is installed in the fracture hole groove. The fastener can be a screw type workpiece; the purpose of using the patch 1-2b is to prevent the leakage of grease inside the sliding sleeve.

[0030] Further described, the sand-blasting hole spiral distribution type intelligent fracturing sliding sleeve comprises a fracturing sliding sleeve outer cylinder, further comprising a retainer 1-3 fixed to the outer cylinder body 1-1, which can be an elastic clamping structure or a shear pin; the left and right ends of the outer cylinder body 1-1 are each threadedly connected to a connecting cylinder 1-4, and the ends of the two connecting cylinders 1-4 away from each other are each threadedly connected to a joint 1-5. The inner diameters of the outer cylinder body 1-1 and the two connecting cylinders 1-4 are the same, and the inner wall of the joint 1-5 protrudes from the inner wall of the connecting cylinder 1-4. In combination Figure 5The inner cylinder 2-1 is slidably connected in the outer cylinder body 1-1, the inner cylinder 2-1 is provided with a positioning module mounting groove 2-2 and a clamping groove 2-3, the positioning module mounting groove 2-2 is provided with a positioning module 2-4 fixed on the inner cylinder 2-1. In the initial state, the inner cylinder 2-1 blocks the fracturing hole 1-2, and the clamping device 1-3 is clamped in the clamping groove 2-3.

[0031] For the convenience of description, the sandblasting hole spiral distribution type intelligent fracturing sliding sleeve is briefly described as a sliding sleeve. During operation, the two joints 1-5 are respectively fixed to the two casings at the ends away from each other, the intelligent tag 3 is set to open the target opening section sliding sleeve before entering the well, the intelligent tag 3 automatically detects the positioning module 2-4 of each section sliding sleeve along the way during pumping into the well, when reaching the target section sliding sleeve, the intelligent tag 3 opens the anchoring and sets on the inner wall of the inner cylinder 2-1 of the sliding sleeve, under the action of the wellhead pump pressure, the intelligent tag 3 pushes the sliding sleeve to open, exposes the fracturing holes 1-2 spirally arranged on the outer cylinder body 1-1, and starts the fracturing operation.

Claims

1. A fracturing sleeve outer cylinder, comprising an outer cylinder body (1-1), wherein fracturing holes (1-2) are provided on the outer cylinder body (1-1), the axis of the fracturing holes (1-2) is perpendicular to the axis of the outer cylinder body (1-1), and the fracturing holes (1-2) are distributed along at least one spiral line, wherein the axis of the spiral line coincides with the axis of the outer cylinder body (1-1).

2. In the fracturing sleeve outer cylinder according to claim 1, when at least two of the spiral lines are distributed, each row of fracturing holes (1-2) is circumferentially distributed on the outer wall of the outer cylinder body (1-1).

3. In the fracturing sleeve outer cylinder according to claim 1, the spacing between two adjacent rows of fracturing holes (1-2) on the axis is between 1.1 times and 5 times the diameter of the fracturing holes (1-2).

4. In the fracturing sleeve outer cylinder according to claim 1, the included angle between the axes of two adjacent fracturing holes (1-2) on the helix is ​​30° to 70°.

5. The fracturing sleeve outer cylinder according to claim 1, wherein the diameter of the fracturing holes (1-2) ranges from 10 to 50 mm, and the number of holes on a single circumference is 1 to 7, and there are 2 to 5 rows along the axial direction.

6. A spiral distributed intelligent fracturing sleeve with sandblasting holes, comprising an outer cylinder of the fracturing sleeve as described in any one of claims 1 to 5, and a locking device (1-3) fixedly connected to the outer cylinder body (1-1), an inner cylinder (2-1) slidably connected inside the outer cylinder body (1-1), the locking device (1-3) locking onto the inner cylinder (2-1), and the inner cylinder (2-1) sealing the fracturing holes (1-2).

7. The spiral distributed intelligent fracturing sleeve with sandblasting holes according to claim 6, wherein the locking device (1-3) is a shear pin, one end of which is threadedly connected to the outer cylinder body (1-1), and the inner cylinder (2-1) is provided with a locking groove (2-3), and the other end of the shear pin is locked in the locking groove (2-3).

8. According to claim 6, the spiral distributed intelligent fracturing sleeve with sandblasting holes is provided, with a connecting cylinder (1-4) threaded to each of the left and right ends of the outer cylinder body (1-1), and a connector (1-5) threaded to the ends of the two connecting cylinders (1-4) away from each other. The outer cylinder body (1-1), the connecting cylinder (1-4) and the connector (1-5) are coaxially arranged. The inner diameter of the outer cylinder body (1-1) and the two connecting cylinders (1-4) is the same. The inner wall of the connector (1-5) protrudes from the inner wall of the connecting cylinder (1-4). After the inner cylinder (2-1) is disengaged from the locking device (1-3), the inner cylinder (2-1) can be locked on the connector (1-5) in the direction of travel, and the fracturing hole (1-2) is opened.

9. The spiral distributed intelligent fracturing sleeve with sandblasting holes according to claim 6, wherein the inner cylinder (2-1) is provided with a positioning module mounting groove (2-2), and the positioning module mounting groove (2-2) is provided with a positioning module (2-4) fixedly connected to the inner cylinder (2-1).

10. According to claim 9, the intelligent tag (3) can identify the positioning module (2-4). When it is identified as the target intelligent fracturing sleeve with a spiral distributed sandblasting hole, the intelligent tag (3) opens the anchor and sets on the inner wall of the inner cylinder (2-1). Under the action of the wellhead pump pressure, the intelligent tag (3) pushes the inner cylinder (2-1) to move, and the locking device (1-3) is no longer locking the inner cylinder (2-1) under force, and the fracturing hole (1-2) is exposed.

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