Open hole packer staged fracturing string with accurate crack distribution and use method

A staged fracturing and packer technology, which is applied in the directions of sealing/isolation, earthwork drilling, wellbore/well components, etc. The fracture position is affected by the ground stress and natural fractures, and the stimulation effect is poor, so as to reduce the contact area, improve the fracture creation effect, and balance the stimulation effect of the reservoir

Pending Publication Date: 2020-02-28
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] This string structure has the following significant disadvantages: 1) After the fracturing fluid enters the open hole from the sliding sleeve, the length of the open hole in contact with it is too long (equal to the length of each section), and the contact area between the fracturing fluid and the open hole is large. The fluid loss is very fast, which affects the fracture creation effect of the fracturing fluid
Although each sliding sleeve is generally in the middle of the section, any part between the packers at both ends of the section is subject to this pressure, so it is possible to open the fracture (fracture initiation) at any position in the section. The location is affected by in-situ stress and natural fractures), so the actual location of the crack is unpredictable, often not the location of the sliding sleeve, and there may be two adjacent cracks that are very close to a seal The position of the packer, even two fractures close to a certain packer are connected in the formation after extending
Therefore, this pipe string structure is likely to lead to problems such as unbalanced crack layout and poor reconstruction effect.

Method used

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  • Open hole packer staged fracturing string with accurate crack distribution and use method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Such as figure 1 As shown, a staged fracturing string of an open hole packer with precise seams includes a main oil pipe 8 connected with a plurality of sliding sleeves 3 distributed at intervals, and a plurality of seals are also connected with the main oil pipe 8 . The packer set, the packer set and the sliding sleeve 3 correspond one by one, the packer set includes two packers 7 connected to the main oil pipe 8, and the two packers 7 are respectively connected to the sliding sleeve 3 On both sides, clamp the corresponding sliding sleeve 3 in the middle.

[0025] The main oil pipe 8 is divided into multiple stages, each stage is 80-150m long, and a sliding sleeve 3 is connected to the center of each stage.

[0026] The main tubing 8 is divided into multiple stages, each stage has a sliding sleeve 3 and a packer set, the sliding sleeve 3 is located in the middle of the corresponding stage, and the two packers 7 of the packer set are connected to the sliding sleeve 3 ...

Embodiment 2

[0028] Such as figure 1 As shown, on the basis of Example 1, the oil manifold 8 is also connected with a setting joint 2, the setting joint 2 is located behind the rearmost packer 7, and the oil manifold behind the setting joint 2 Also be connected with floating shoes 1 on the 8.

[0029] The main oil pipe 8 is formed by connecting multiple oil pipes, and the two packers 7 in the packer group of the sliding sleeve 3 are separated from the middle sliding sleeve 3 by the length of one oil pipe. Avoiding that the two packers 7 and the sliding sleeve 3 are connected together is too rigid, resulting in difficulty in going downhole.

[0030] The main oil pipe 8 is formed by connecting several oil pipes in sequence, and there is an oil pipe between each packer 7 and the corresponding sliding sleeve 3, that is, a length of 10 meters.

[0031] The front end of the main oil pipe 8 is connected with a return oil pipe 10 through a hanger 9, and the other end of the oil return pipe 10 is...

Embodiment 3

[0035] Such as figure 1 As shown, on the basis of Example 2, a method for using a staged fracturing string of an open hole packer with precise seams includes the following steps:

[0036] In the first step, the pipe string is run in. After the open hole horizontal well is drilled, the main oil pipe 8 and all the sliding sleeves 3 and packers 7 on the main oil pipe 8 are sequentially run into the casing 16 from the wellhead, and pass through the open hole wellbore 15 Go all the way down to the design position;

[0037] After the drilling is completed, the main tubing 8 and its sliding sleeve 3, packer 7 and other components are lowered to the design position of the open hole wellbore 15. Multi-stage fracturing is performed sequentially toward the wellhead. Each stage is 80-150 meters long on the said total oil pipe 8, and the sliding sleeve 3 of each stage is all positioned at the center of each stage.

[0038] In the second step, the packer 7 is set, the completion fluid is...

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Abstract

The invention discloses an open hole packer staged fracturing string with accurate crack distribution and a use method. The open hole packer staged fracturing string comprises a main oil pipe, whereina plurality of sliding sleeves distributed at intervals are connected to the main oil pipe; a plurality of packer groups are further connected to the main oil pipe; the packer groups correspond to the sliding sleeves one to one; each packer group comprises two packers connected to the main oil pipe; and the two packers are connected to the two sides of the sliding sleeves respectively to clamp the corresponding sliding sleeves in the middle. The crack initiation position of a crack is limited through the packer groups, the ideal layout of the crack can be realized, the purpose of balanced transformation of a reservoir is achieved, the contact area between fracturing fluid and an open hole stratum can be remarkably reduced, the filtration loss of the fracturing fluid is effectively reduced, and the crack forming effect of the fracturing fluid is improved.

Description

technical field [0001] The invention belongs to the technical field of staged fracturing of oil and gas wells, and in particular relates to an open-hole packer staged fracturing string with precise fracture distribution and a use method thereof. Background technique [0002] In order to improve the productivity of single well, the development technology of horizontal well and sidetracking horizontal well has been developed rapidly in major oil fields in the world. Open hole packer staged fracturing is a mainstream fracturing technology for horizontal wells and sidetracked horizontal wells. Open hole packer staged fracturing technology can save casing and reduce development costs, especially for slim horizontal wells where casing cementing is not convenient, open hole packer staged fracturing technology shows unique advantages. [0003] The current open-hole packer staged fracturing string structure is basically a string structure in which sliding sleeves and packers are alt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/26E21B33/124
CPCE21B43/26E21B33/124
Inventor 张承武李勇郑维师吴增智王忍峰汪小宇王兴建陈建刚王惠生武月荣李雪蒋文学陈迎花刘怡君陈财政李珊安全成杨发贺华镭诗佳庆段成才
Owner BC P INC CHINA NAT PETROLEUM CORP
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