Staged fracturing crack propagation control device

Abstract

The utility model relates to the technical field of oil extraction equipment, and discloses a staged fracturing crack expansion control device which comprises an oil pipe body, and a packer, a hydraulic jet fracturing pipe column and a bridge plug piece are sequentially installed on the oil pipe body. Two groups of inner sleeves are arranged in the hydraulic jet fracturing pipe column; the position, close to the inner sleeve, of the surface of the hydraulic jet fracturing pipe column is provided with multiple sets of butt joint holes which are annularly arranged at equal intervals, and according to the staged fracturing crack expansion control device, the multiple sets of jet holes are formed and have different jet directions, cracks can be promoted to expand in multiple directions at the same time, and the fracture expansion rate is increased. A more complex fracture network with a wider coverage range is formed, and the complexity is beneficial to improving the crushing degree of rocks and increasing flowing channels of oil gas, so that the fracturing effect is improved, the phenomenon of excessive expansion in a certain direction can be reduced, and meanwhile it is ensured that enough cracks exist in other directions.

Description

TECHNICAL FIELD

[0001] The utility model relates to oil extraction equipment technical field, concretely is a segmented fracturing fracture propagation control device. BACKGROUND

[0002] With the development of unconventional oil and gas resources, segmented fracturing technology has become one of the key technologies to improve the single well production and ultimate recovery of oil and gas fields. Segmented fracturing refers to dividing the horizontal well section into multiple fracturing sections according to the physical characteristics of the reservoir, and fracturing each fracturing section respectively, so as to increase the contact area of the fracture and the formation and improve the development efficiency of the oil and gas field.

[0003] The segmented fracturing fracture propagation control device has single jet hole direction, which leads to the fact that the fracture mainly expands along a single or predetermined direction, limits the complexity and coverage range of the fracture network, and may excessively expand in a certain direction and expand insufficiently in other directions, affecting the fracturing effect. Therefore, the segmented fracturing fracture propagation control device is proposed to solve the above problems. SUMMARY

[0004] In view of the deficiencies of the prior art, the segmented fracturing fracture propagation control device is provided, which solves the problem of the segmented fracturing fracture propagation control device having single jet hole direction, leading to the fact that the fracture mainly expands along a single or predetermined direction, limiting the complexity and coverage range of the fracture network, and possibly excessively expanding in a certain direction and insufficiently expanding in other directions, affecting the fracturing effect.

[0005] To achieve the above purpose, the utility model realizes the following technical scheme: a segmented fracturing fracture propagation control device, comprising an oil pipe main body, a packer, a hydraulic jet fracturing pipe column and a bridge plug are sequentially installed on the oil pipe main body.

[0006] The hydraulic jet fracturing pipe column is internally provided with two groups of inner sleeves.

[0007] A plurality of groups of ring-shaped equidistantly arranged butt joints are formed on the surface of the hydraulic jet fracturing pipe column near the inner sleeve position.

[0008] A plurality of groups of ring-shaped equidistantly arranged jet holes are formed on the surface of the inner sleeve, a plurality of rows of the plurality of groups of ring-shaped jet holes are arranged, and the inner hole inclination angles of each row of ring-shaped jet holes are different.

[0009] Two groups of inner sleeves are fixedly installed with a connecting ring between them.

[0010] The hydraulic jet fracturing pipe column is internally provided with an electric push rod for driving the synchronous movement of the two groups of inner sleeves.

[0011] Preferably, the outer surface of the inner sleeve closely fits the inner side wall of the hydraulic jet fracturing pipe string, and the inner diameter of the butt joint hole is larger than the inner diameter of the jet hole.

[0012] Preferably, the hydraulic jet fracturing pipe string is internally provided with a fixing disc, a plurality of sets of support rods are fixed on the surface of the fixing disc, and the support rods are fixedly connected with the inner side wall of the hydraulic jet fracturing pipe string, the electric push rod is fixed on the surface of the fixing disc, the output end of the electric push rod is fixed with a connecting block, and the connecting block is fixedly connected with the inner sleeve.

[0013] Preferably, the surface of the fixing disc is fixedly provided with a protective sleeve for protecting the electric push rod, one end of the protective sleeve is provided with a through hole, the output end of the electric push rod moves in the through hole of the protective sleeve, and a sealing ring is fixed at the through hole of the protective sleeve, so that the sealing property of the connection between the output end of the electric push rod and the protective sleeve is increased.

[0014] Preferably, the two ends of the inner sleeve are provided with inclined chamfers.

[0015] Preferably, the surface of the inner sleeve is fixedly provided with a limiting block, the inner side wall of the hydraulic jet fracturing pipe string is provided with a limiting groove matched with the limiting block, and the limiting block and the hydraulic jet fracturing pipe string are slidably connected through the limiting groove.

[0016] Beneficial effects

[0017] The utility model provides a segmented fracturing crack propagation control device. Compared with prior art, the following beneficial effects are possessed:

[0018] The segmented fracturing crack propagation control device, by setting multiple sets of jet holes and making the jet holes have different jet directions, can promote the crack to expand in multiple directions at the same time, form a more complex and wider crack network, the complexity helps to improve the breaking degree of the rock, increase the flow channel of oil and gas, thereby improving the fracturing effect, can reduce the phenomenon of excessive expansion in a certain direction, and at the same time ensure that there is enough crack in other directions, improve the use effect of the device. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is the whole structure schematic view of the utility model;

[0020] Figure 2 It is the hydraulic jet fracturing pipe string structure sectional view of the utility model;

[0021] Figure 3 It is the inner sleeve structure sectional view of the utility model;

[0022] Figure 4The utility model discloses hydraulic jet fracturing pipe column another view's structure section view.

[0023] In the figure: 101, oil pipe body; 102, packer; 103, hydraulic jet fracturing pipe column; 104, bridge plug; 105, inner sleeve; 106, connecting ring; 107, butt joint hole; 108, inclination angle; 109, fixed disc; 110, electric push rod; 111, protective sleeve; 112, link frame; 113, jet hole; 114, limiting block; 115, limiting groove. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the utility model.

[0025] As Figure 1 shown:

[0026] A segmented fracturing fracture propagation control device comprises an oil pipe body 101.

[0027] In the embodiment: to solve the technical problems existing in the prior art, as disclosed in the background art above, "the current segmented fracturing fracture propagation control device, the jet hole 113 direction is single, resulting in the fracture mainly expanding along a single or predetermined direction, limiting the complexity and coverage of the fracture network, and it may excessively expand in a certain direction and insufficiently expand in other directions, affecting the fracturing effect", in combination with use, this problem is obviously a practical problem and is relatively difficult to solve, and the power equipment involved in the product is all powered by external power supply.

[0028] Further,

[0029] As Figures 1-4 shown:

[0030] In combination with the above content: the oil pipe body 101 is sequentially provided with a packer 102, a hydraulic jet fracturing pipe column 103 and a bridge plug 104;

[0031] The hydraulic jet fracturing pipe column 103 is internally provided with two groups of inner sleeves 105;

[0032] The surface of the hydraulic jet fracturing pipe column 103 is provided with a plurality of annular equidistant butt joint holes 107 near the position of the inner sleeve 105;

[0033] The surface of the inner sleeve 105 is provided with a plurality of groups of annularly equidistantly arranged injection holes 113. The plurality of groups of annularly arranged injection holes 113 are provided with a plurality of rows, and the inner holes of the annularly arranged injection holes 113 in each row are different in inclination angle;

[0034] The two groups of inner sleeves 105 are fixedly installed with a connecting ring 106;

[0035] The hydraulic jet fracturing pipe string 103 is internally provided with an electric push rod 110 for driving the two groups of inner sleeves 105 to move synchronously;

[0036] The outer surface of the inner sleeve 105 is tightly combined with the inner side wall of the hydraulic jet fracturing pipe string 103, and the inner diameter of the butt joint hole 107 is greater than the inner diameter of the injection hole 113;

[0037] The hydraulic jet fracturing pipe string 103 is internally provided with a fixing disc 109, a plurality of support rods are fixed on the surface of the fixing disc 109, and the support rods are fixedly connected with the inner side wall of the hydraulic jet fracturing pipe string 103. The electric push rod 110 is fixed on the surface of the fixing disc 109, the output end of the electric push rod 110 is fixed with a connecting block, and the connecting block is fixed with a connecting frame 112. The connecting frame 112 is fixedly connected with one group of inner sleeves 105;

[0038] The surface of the fixing disc 109 is fixedly installed with a protective sleeve 111 for protecting the electric push rod 110. One end of the protective sleeve 111 is provided with a through hole, the output end of the electric push rod 110 moves in the through hole of the protective sleeve 111, and a sealing ring is fixed at the through hole of the protective sleeve 111. The sealing ring is used to increase the sealing property of the connection between the output end of the electric push rod 110 and the protective sleeve 111.

[0039] In the embodiment, the segmented fracturing crack propagation control device is used as follows. The tubing body 101, the packer 102, the hydraulic jet fracturing pipe string 103 and the bridge plug 104 are lowered into the wellbore, positioned to the target layer, the bridge plug 104 is activated and set, the layer above the tubing body 101 is isolated, the hydraulic jet fracturing pipe string 103 is expanded and tightly contacted with the well wall, the layer below the tubing body 101 is isolated, high-pressure fluid, usually a mixture of water and carried proppant such as sand, is pumped through the tubing body 101 into the hydraulic jet fracturing pipe string 103, the high-pressure fluid passes through the injection hole 113 and is discharged along the butt joint hole 107, the pressure generated by the jetting fluid exceeds the fracture strength of the rock, causing the rock to crack and form a crack;

[0040] By starting the electric push rod 110, the adapter frame 112 is driven to move, and the two groups of inner sleeves 105 are pushed to move by the adapter frame 112. Since the two groups of inner sleeves 105 are connected by the connecting ring 106, the two groups of inner sleeves 105 are pushed to move synchronously. The surface of the inner sleeve 105 is provided with a plurality of groups of annularly arranged jet holes 113. The inner holes of the annularly arranged jet holes 113 in each row are different in inclination angle, so that the directions of the jet fluid are different. When the electric push rod 110 drives the two groups of inner sleeves 105 to move, each row of annularly arranged jet holes 113 on the inner sleeve 105 can be corresponded to the annularly arranged butt joint holes 107 respectively. When each row of annularly arranged inner sleeves 105 is corresponded to the butt joint holes 107, the directions of the jet fluid are different.

[0041] The present scheme can promote the cracks to expand in multiple directions at the same time by arranging a plurality of groups of jet holes 113 and making the jet holes 113 have different jet directions, so as to form a more complex and wider crack network. The complexity can help to improve the breaking degree of the rock and increase the flow channel of the oil and gas, so as to improve the fracturing effect and reduce the phenomenon of excessive expansion in a certain direction while ensuring that there are enough cracks in other directions, thereby improving the use effect of the device.

[0042] The protective sleeve 111 can protect the electric push rod 110.

[0043] Further,

[0044] In an optional embodiment, the two ends of the inner sleeve 105 are provided with inclined chamfers 108.

[0045] In the present embodiment, the two ends of the inner sleeve 105 are provided with inclined chamfers 108. The inclined chamfers 108 can reduce the impact of the fluid on the inner sleeve 105, so that the fluid can enter the inner sleeve 105 smoothly, reduce the impact and turbulence when the fluid enters, and improve the smoothness of the flow.

[0046] Further,

[0047] In an optional embodiment, the surface of the inner sleeve 105 is fixed with a limiting block 114, and the inner side wall of the hydraulic jet fracturing pipe column 103 is provided with a limiting groove 115 matched with the limiting block 114. The limiting block 114 and the hydraulic jet fracturing pipe column 103 are connected by sliding through the limiting groove 115.

[0048] In the present embodiment, the limiting block 114 slides in the limiting groove 115 while the inner sleeve 105 moves. The limiting block 114 and the limiting groove 115 can limit the movement of the inner sleeve 105, so that the inner sleeve 105 moves more stably.

[0049] The working principle and use process of the utility model: the segmented fracturing fracture propagation control device, when using, the tubing main body 101, packer 102, hydraulic jet fracturing pipe column 103 and bridge plug 104 are lowered into the wellbore, and are positioned to the target interval, the bridge plug 104 is activated and sets, and the interval above the tubing main body 101 is isolated, the hydraulic jet fracturing pipe column 103 expands and is in close contact with the well wall, and the interval below the tubing main body 101 is isolated, and the high-pressure fluid, usually water and the mixture carrying proppant such as sand, is pumped through the tubing main body 101 and delivered to the hydraulic jet fracturing pipe column 103, the high-pressure fluid passes through the jet hole 113, and is discharged along the butt joint hole 107, the pressure generated by the jet fluid exceeds the fracture strength of the rock, and the rock is broken, and a fracture is formed, the electric push rod 110 is started, and then the connecting frame 112 is driven to move, the two groups of inner casings 105 are pushed to move by the connecting frame 112, the two groups of inner casings 105 are connected by the connecting ring 106, and the two groups of inner casings 105 are pushed to move synchronously, and the surface of the inner casing 105 is provided with a plurality of groups of annularly arranged jet holes 113, the inner hole inclination angles of the annularly arranged jet holes 113 of each row are different, and the directions of the jet fluid are different, when the electric push rod 110 drives the two groups of inner casings 105 to move, each row of annularly arranged jet holes 113 on the inner casing 105 can be corresponded to the annularly arranged butt joint hole 107 respectively, each row of annularly arranged inner casings 105 is corresponded to the butt joint hole 107 at the same time, and the directions of the jet fluid are different, the scheme is provided with a plurality of groups of jet holes 113, and the jet holes 113 have different jet directions, can promote the fracture to expand in multiple directions at the same time, form a more complex and wider range of fracture network, the complexity helps to improve the rock breaking degree, increase the oil and gas flow channel, thereby improving the fracturing effect, can reduce the phenomenon of excessive expansion in a certain direction, and ensure that there are enough fractures in other directions at the same time, and the use effect of the device is improved.

[0050] Meanwhile, the contents not described in detail in the specification all belong to the prior art known by those skilled in the art.

Claims

1. A segmented fracture propagation control device comprising a tubing body (101), characterized in that, The tubing body (101) is sequentially provided with a packer (102), a hydraulic jet fracturing pipe column (103) and a bridge plug (104); The hydraulic jet fracturing pipe column (103) is internally provided with two groups of inner sleeves (105); The surface of the hydraulic jet fracturing pipe column (103) is provided with a plurality of groups of ring-shaped equidistantly arranged butt joints (107) near the inner sleeves (105); The surface of the inner sleeve (105) is provided with a plurality of groups of ring-shaped equidistantly arranged jet holes (113), the plurality of groups of ring-shaped jet holes (113) are provided with a plurality of rows, and the inner holes of the ring-shaped jet holes (113) in each row are different in inclination angle; The two groups of inner sleeves (105) are fixedly provided with a connecting ring (106) therebetween; The hydraulic jet fracturing pipe column (103) is internally provided with an electric push rod (110) for driving the two groups of inner sleeves (105) to move synchronously.

2. The segmented fracture propagation control device of claim 1, wherein: The outer surface of the inner sleeve (105) is tightly combined with the inner side wall of the hydraulic jet fracturing pipe column (103), and the inner diameter of the butt joint (107) is greater than that of the jet hole (113).

3. The segmented fracture propagation control device of claim 1, wherein: The hydraulic jet fracturing pipe column (103) is internally provided with a fixing disc (109), the surface of the fixing disc (109) is fixedly provided with a plurality of groups of supporting rods, the supporting rods are fixedly connected with the inner side wall of the hydraulic jet fracturing pipe column (103), the electric push rod (110) is fixed on the surface of the fixing disc (109), the output end of the electric push rod (110) is fixedly provided with a connecting block, the connecting block is fixedly provided with an adapter frame (112), and the adapter frame (112) is fixedly connected with one group of inner sleeves (105).

4. The segmented fracture propagation control device of claim 3, wherein: The surface of the fixing disc (109) is fixedly provided with a protective sleeve (111) for protecting the electric push rod (110), one end of the protective sleeve (111) is provided with a through hole, the output end of the electric push rod (110) moves in the through hole of the protective sleeve (111), and the through hole of the protective sleeve (111) is fixedly provided with a sealing ring for increasing the sealing property of the connection between the output end of the electric push rod (110) and the protective sleeve (111).

5. The segmented fracture propagation control device of claim 1, wherein: The two ends of the inner sleeve (105) are provided with inclined chamfers (108).

6. The segmented fracture propagation control device of claim 1, wherein: The surface of the inner sleeve (105) is fixedly provided with a limiting block (114), the inner side wall of the hydraulic jet fracturing pipe column (103) is provided with a limiting groove (115) matched with the limiting block (114), and the limiting block (114) and the hydraulic jet fracturing pipe column (103) are slidably connected through the limiting groove (115).

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