Adjustable sliding sleeve suitable for multistage fracturing of horizontal well

Abstract

The utility model discloses an adjustable sliding sleeve suitable for horizontal well multistage fracturing, and relates to the technical field of horizontal well multistage fracturing, the adjustable sliding sleeve comprises an outer sleeve and an inner sliding sleeve in sliding connection with the inner part of the outer sleeve, the outer side of the outer sleeve is uniformly provided with a plurality of groups of fracturing holes, and one end of the inner part of the inner sliding sleeve is fixedly provided with a convex ring. The lead screw rotates to drive the adjusting frame to move axially, so that the adjusting frame drives the multiple sets of supporting arms to be unfolded, the multiple sets of adjusting arms are passively turned over and opened along the rotating shafts at the tail ends of the multiple sets of adjusting arms under the action of the multiple sets of supporting arms, the diameter of the multiple sets of opened adjusting arms is larger than the inner diameter of the protruding ring, and therefore the protruding ring can be fixed when the whole fixing cylinder moves axially. A convex ring can be driven to move through multiple groups of adjusting arms, so that the convex ring drives an inner sliding sleeve to axially move relative to an outer sleeve, at the moment, multiple groups of fracturing holes in the outer wall of the outer sleeve are opened, then fracturing fluid enters rock through the multiple groups of fracturing holes for fracturing operation, the overall use effect is good, and continuous use can be achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of multi-stage fracturing of horizontal wells, in particular to an adjustable sliding sleeve suitable for multi-stage fracturing of horizontal wells. Background Art

[0002] Horizontal well multi-stage fracturing technology is a production-enhancing measure used to increase the output of oil and gas wells. Its working principle is to form multiple cracks in the reservoir through staged fracturing in the horizontal well section, thereby increasing the seepage channels of oil and gas and improving the output of oil and gas wells.

[0003] In the exploitation of oil and gas resources, the application of multi-stage fracturing technology for horizontal wells is becoming more and more widespread. However, the existing sliding sleeves have problems such as inconvenient adjustment and insufficient precision in actual use, which makes it difficult to meet the needs of precise fracturing under complex geological conditions. Utility Model Content

[0004] Based on this, the purpose of the utility model is to provide an adjustable sliding sleeve suitable for multi-stage fracturing of horizontal wells, so as to solve the technical problem that the sliding sleeve in the prior art is inconvenient to adjust and has insufficient precision in actual use, and it is difficult to meet the requirements of precise fracturing under complex geological conditions.

[0005] To achieve the above object, the utility model provides the following technical solution: an adjustable sliding sleeve suitable for multi-stage fracturing of horizontal wells, comprising an outer sleeve and an inner sleeve slidably connected thereto, wherein a plurality of groups of fracturing holes are evenly arranged on the outer side of the outer sleeve, and a convex ring is fixed at one end of the inner sleeve;

[0006] A fixed cylinder is arranged inside the inner sleeve, a screw rod is rotatably connected inside the fixed cylinder, an adjustment frame is movably connected outside the screw rod, support arms are rotatably connected at the four corners outside the adjustment frame, the ends of the four groups of support arms are rotatably connected to the adjustment arms, and the ends of the adjustment arms are rotatably connected to the fixed cylinder via a rotating shaft;

[0007] A hollow shaft motor is installed inside the fixed cylinder, an output shaft is fixed to the output end of the hollow shaft motor, and one end of the output shaft is fixedly connected to one end of the screw rod;

[0008] A ventilation pipe is fixed inside the fixed cylinder, and one end of the ventilation pipe passes through the support cylinder, the screw rod, the output shaft and the hollow shaft motor in sequence. A blocking airbag located on one side of the fixed cylinder is fixed at the end of the ventilation pipe.

[0009] By adopting the above technical scheme, when the inner sleeve needs to be adjusted and opened, it is only necessary to send the fixed cylinder to the inner side of the corresponding inner sleeve under the action of external equipment, and then the hollow shaft motor is started to drive the screw rod to rotate, and then the rotation of the screw rod drives the adjusting frame to move axially, so that the adjusting frame drives multiple groups of support arms to unfold, and under the action of multiple groups of support arms, multiple groups of adjusting arms are passively flipped and opened along the rotating shafts at their ends, and then the diameters of the multiple groups of opened adjusting arms are larger than the inner diameter of the convex ring, and then under the overall axial movement of the fixed cylinder, the convex ring can be driven to move through the multiple groups of adjusting arms, so that the convex ring drives the inner sleeve to move axially relative to the outer sleeve, and then the multiple groups of fracturing holes on the outer wall of the outer sleeve are opened, and then the fracturing fluid enters the rock through the multiple groups of fracturing holes to perform fracturing operations, and the overall use effect is good and can be used continuously.

[0010] The utility model is further configured that a support tube extending into the interior of the fixed tube is fixed to one end of the screw rod, and the support tube and the fixed tube are movably connected via a bearing.

[0011] By adopting the above technical solution, the cooperation between the support tube and the bearing makes the rotation process of the screw rod more stable and avoids the occurrence of deviation.

[0012] The utility model is further configured that an elastic cover located outside the plurality of support arms and the plurality of adjustment arms is fixed outside the fixing tube.

[0013] By adopting the above technical solution, the elastic cover can expand as the support arm and the adjustment arm are unfolded, thereby protecting the support arm and the adjustment arm and preventing the fracturing fluid from entering the interior of the fixed tube.

[0014] To sum up, the utility model mainly has the following beneficial effects: when the inner sleeve needs to be adjusted and opened, the utility model only needs to send the fixed cylinder to the inner side of the corresponding inner sleeve under the action of external equipment, and then the hollow shaft motor is started to drive the screw rod to rotate, and then the rotation of the screw rod drives the adjusting frame to move axially, so that the adjusting frame drives multiple groups of support arms to unfold, and under the action of multiple groups of support arms, multiple groups of adjusting arms are passively flipped and opened along the rotating shafts at their ends, and then the diameters of the multiple groups of opened adjusting arms are larger than the inner diameter of the convex ring, and then under the overall axial movement of the fixed cylinder, the convex ring can be driven to move through the multiple groups of adjusting arms, so that the convex ring drives the inner sleeve to move axially relative to the outer sleeve, and at this time, multiple groups of fracturing holes on the outer wall of the outer sleeve are opened, and then the fracturing fluid enters the rock through the multiple groups of fracturing holes to perform fracturing operations, and the overall use effect is good and can be used continuously. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0016] Figure 2 It is a cross-sectional view of the utility model;

[0017] Figure 3 For this utility model Figure 2 A magnified image of point A;

[0018] Figure 4 It is an enlarged cutaway view of the interior of the utility model;

[0019] Figure 5 It is a partial cutaway view of the utility model.

[0020] In the figure: 1. outer sleeve; 2. fracturing hole; 3. inner sleeve; 4. fixed sleeve; 5. hollow shaft motor; 6. output shaft; 7. screw rod; 8. adjustment frame; 9. support arm; 10. adjustment arm; 11. support sleeve; 12. bearing; 13. ventilation pipe; 14. sealing airbag; 15. elastic cover; 16. convex ring. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. The embodiments described below with reference to the drawings are exemplary and are only used to explain the utility model, and cannot be understood as limiting the utility model.

[0022] The following describes an embodiment of the utility model based on its overall structure.

[0023] An adjustable sliding sleeve suitable for multi-stage fracturing of horizontal wells, such as Figure 1-5 As shown, it includes an outer sleeve 1 and an inner sleeve 3 slidably connected thereto, a plurality of groups of fracturing holes 2 are evenly arranged on the outer side of the outer sleeve 1, and a convex ring 16 is fixed at one end of the inner sleeve 3;

[0024] A fixed cylinder 4 is arranged inside the inner sliding sleeve 3, a screw rod 7 is rotatably connected inside the fixed cylinder 4, an adjustment frame 8 is movably connected outside the screw rod 7, support arms 9 are rotatably connected to the four corners of the outer side of the adjustment frame 8, and the ends of the four groups of support arms 9 are rotatably connected to the adjustment arms 10, and the ends of the adjustment arms 10 are rotatably connected to the fixed cylinder 4 through a rotating shaft;

[0025] A hollow shaft motor 5 is installed inside the fixed cylinder 4, an output shaft 6 is fixed to the output end of the hollow shaft motor 5, and one end of the output shaft 6 is fixedly connected to one end of the screw rod 7;

[0026] Under the action of the multiple groups of support arms 9, the multiple groups of adjustment arms 10 are passively flipped open along the rotating shaft at the end thereof, and the diameter of the multiple groups of adjustment arms 10 after opening is larger than the inner diameter of the convex ring 16, and the convex ring 16 can be driven to move by the multiple groups of adjustment arms 10 when the fixed cylinder 4 moves axially as a whole;

[0027] Thus, the convex ring 16 drives the inner sleeve 3 to move axially relative to the outer sleeve 1, and at this time, the multiple groups of fracturing holes 2 on the outer wall of the outer sleeve 1 are opened, and then the fracturing fluid enters the rock through the multiple groups of fracturing holes 2 to perform fracturing operations, and the overall use effect is good and can be used continuously;

[0028] A vent pipe 13 is fixed inside the fixed cylinder 4, and one end of the vent pipe 13 passes through the support cylinder 11, the screw rod 7, the output shaft 6 and the hollow shaft motor 5 in sequence. A blocking air bag 14 located on one side of the fixed cylinder 4 is fixed at the end of the vent pipe 13;

[0029] At this time, the blocking airbag 14 located at one end of the fixed tube expands and expands under the action of the ventilation tube 13, and then the expanded blocking airbag 14 can seal the inner wall of the outer casing 1, and then the fracturing fluid that subsequently enters the inner part of the outer casing 1 can only be discharged through the multiple groups of fracturing holes 2, thereby ensuring the overall fracturing quality and effect of the rock.

[0030] See also Figure 3 and Figure 4 A support tube 11 extending into the interior of the fixed tube 4 is fixed at one end of the screw rod 7, and the support tube 11 and the fixed tube 4 are movably connected via a bearing 12. The utility model sets the above structure, wherein the cooperation of the support tube 11 and the bearing 12 makes the rotation process of the screw rod 7 more stable and avoids the occurrence of deviation.

[0031] See also Figure 3 and Figure 4 An elastic cover 15 located outside the multiple groups of support arms 9 and the multiple groups of adjustment arms 10 is fixed on the outside of the fixed cylinder 4. By setting the above structure, the utility model can expand the elastic cover 15 as the support arms 9 and the adjustment arms 10 are unfolded, thereby protecting the support arms 9 and the adjustment arms 10 and preventing the fracturing fluid from entering the interior of the fixed cylinder 4.

[0032] The working principle of the utility model is: when in use, the power is turned on, and under the action of external drilling equipment, multiple sets of outer casings connected end to end are driven to perform horizontal drilling operations on rocks, wherein multiple sets of outer casings and inner sliding sleeves are connected end to end in sequence;

[0033] When the overall drilling is completed, when the inner sleeve 3 needs to be adjusted and opened, it is only necessary to send the fixed cylinder 4 to the inner side of the corresponding inner sleeve 3 under the action of external equipment, wherein a sensor can be used for induction detection, so that the fixed cylinder 4 can be accurately moved to the inner side position of each group of inner sleeves 3 under the action of external driving equipment;

[0034] Then the hollow shaft motor 5 starts to drive the screw rod 7 to rotate, and then the screw rod 7 rotates to drive the adjustment frame 8 to move axially, so that the adjustment frame 8 drives the multiple groups of support arms 9 to unfold;

[0035] Under the action of the multiple groups of support arms 9, the multiple groups of adjustment arms 10 are passively flipped open along the rotating shaft at the end thereof, and the diameter of the multiple groups of adjustment arms 10 after opening is larger than the inner diameter of the convex ring 16, and the convex ring 16 can be driven to move by the multiple groups of adjustment arms 10 when the fixed cylinder 4 moves axially as a whole;

[0036] Thus, the convex ring 16 drives the inner sleeve 3 to move axially relative to the outer sleeve 1, and at this time, the multiple groups of fracturing holes 2 on the outer wall of the outer sleeve 1 are opened, and then the fracturing fluid enters the rock through the multiple groups of fracturing holes 2 to perform fracturing operations, and the overall use effect is good and can be used continuously;

[0037] Furthermore, when the multiple groups of adjusting arms 10 are unfolded to drive the inner sleeve 3 to break away from the closure of the multiple groups of fracturing holes 2, the sealing airbag 14 located at one end of the fixed tube expands and expands under the action of the ventilation tube 13, and then the expanded sealing airbag 14 can seal the inner wall of the outer casing 1, and then the fracturing fluid that subsequently enters the inner wall of the outer casing 1 can only be discharged through the multiple groups of fracturing holes 2, thereby ensuring the overall fracturing quality and effect of the rock.

[0038] Although an embodiment of the utility model has been shown and described, this specific embodiment is merely an explanation of the utility model and is not a limitation of the utility model. The specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions and variations to the embodiments without creative contributions as needed without departing from the principles and purpose of the utility model. However, as long as they are within the scope of the claims of the utility model, they are protected by patent law.

Claims

1. An adjustable sliding sleeve suitable for multi-stage fracturing of horizontal wells, comprising an outer sleeve (1) and an inner sleeve (3) slidably connected thereto, characterized in that: The outer side of the outer sleeve (1) is evenly provided with a plurality of groups of fracturing holes (2), and a convex ring (16) is fixed at one end of the inner side of the inner sleeve (3); A fixed cylinder (4) is arranged inside the inner sliding sleeve (3), a screw rod (7) is rotatably connected inside the fixed cylinder (4), an adjustment frame (8) is movably connected outside the screw rod (7), support arms (9) are rotatably connected to the four corners outside the adjustment frame (8), the ends of the four groups of support arms (9) are rotatably connected to the adjustment arms (10), and the ends of the adjustment arms (10) and the fixed cylinder (4) are rotatably connected via a rotating shaft.

2. The adjustable sliding sleeve suitable for multi-stage fracturing of horizontal wells according to claim 1, characterized in that: A hollow shaft motor (5) is installed inside the fixed cylinder (4), an output shaft (6) is fixed to the output end of the hollow shaft motor (5), and one end of the output shaft (6) is fixedly connected to one end of the screw rod (7).

3. The adjustable sliding sleeve suitable for multi-stage fracturing of horizontal wells according to claim 2 is characterized in that: A support tube (11) extending into the interior of the fixed tube (4) is fixed to one end of the screw rod (7), and the support tube (11) and the fixed tube (4) are movably connected via a bearing (12).

4. The adjustable sliding sleeve suitable for multi-stage fracturing of horizontal wells according to claim 3 is characterized in that: A vent pipe (13) is fixed inside the fixed cylinder (4), and one end of the vent pipe (13) passes through the support cylinder (11), the screw rod (7), the output shaft (6) and the hollow shaft motor (5) in sequence, and a blocking air bag (14) located on one side of the fixed cylinder (4) is fixed at the end of the vent pipe (13).

5. The adjustable sliding sleeve suitable for multi-stage fracturing of horizontal wells according to claim 1, characterized in that: An elastic cover (15) located outside the plurality of support arms (9) and the plurality of adjustment arms (10) is fixed on the outside of the fixed cylinder (4), and the elastic cover (15) can expand as the support arms (9) and the adjustment arms (10) are unfolded.

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