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Layered fracturing technology for variable-length graded sliding sleeve

A layered fracturing and variable length technology, applied in the direction of wellbore/well components, production fluid, sealing/isolation, etc., can solve the problems that cannot meet the requirements of multi-stage fracturing construction technology in horizontal wells

Inactive Publication Date: 2013-07-03
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

The disadvantage is that as the horizontal section of the horizontal well becomes longer and longer, even reaching 1000-2000 meters, and the length of each construction section of the variable diameter staged fracturing method cannot exceed 100 meters, therefore, a trip of the pipe string is required When performing layered fracturing from grade 10 to grade 20 or above, due to the limitation of the inner diameter of the pipe string, the maximum diameter is 76mm, the minimum diameter of the steel ball is 30mm, and the minimum grade difference of each steel ball is 4mm. At present, it can only reach grade 10 at most. The technology of variable-diameter staged fracturing can no longer meet the requirements of multi-stage fracturing technology for horizontal wells

Method used

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  • Layered fracturing technology for variable-length graded sliding sleeve
  • Layered fracturing technology for variable-length graded sliding sleeve
  • Layered fracturing technology for variable-length graded sliding sleeve

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] In the variable-length graded sliding sleeve layered fracturing technology, under the condition that the diameter of the sliding sleeve plug valve of each variable-length graded sliding sleeve remains unchanged, by changing the length of the sliding sleeve groove 9 and the sliding sleeve plug valve block 17 at each stage , Realize the graded slip sleeve technology of more than 10 grades, and perform layered fracturing. The variable-length graded sliding sleeve is composed of a sliding sleeve plug valve and a sliding sleeve valve seat assembly, and the sliding sleeve plug valve includes: a fishing head 11, a sealing rubber 12, an upper pressure cap 13, and an O-ring 14 , spring 15, body 16, tooth block 17, steel ball 19, hoop spring 20, mandrel 21, rubber cover plate 22, movable tooth block 17 is arranged on the body 16, and the two ends of tooth block 17 pass through hoop spring respectively 20 to tighten it in the body 16; the seal rubber 12 is integrated on the upper ...

Embodiment 2

[0036] Embodiment 2 is basically the same as Embodiment 1, the difference is: the described variable-length graded sliding sleeve layered fracturing technology, the specific method is as follows:

[0037] 1) Determine the number of variable-length graded sliding sleeves according to the number of construction layers, which is 1 less than the number of construction layers. The lower packer connected to the pipe string is a hydraulic pressure differential compression packer of Y344 structure; Carry out layer-by-layer fracturing from bottom to top, and the length of the pumped sliding sleeve plug valve must be shortened step by step from long to short, and the length of the tooth block 17L≤H sliding sleeve groove 9 length; each lower The sliding sleeve groove length H1 of the first-stage sliding sleeve valve seat assembly is greater than the sliding sleeve groove length H2 of the upper level, and the length L of the tooth block 17 on the sliding sleeve plug valve is also longer th...

Embodiment 3

[0041] It is basically the same as Example 2, except that: the number of the tooth blocks 17 is 6, (2-6 pieces are acceptable), and the mandrel 21 is used as the axis; or the width of the groove 18 The same diameter as the steel ball 19; or the sliding sleeve groove 9 and the tooth block 17 are a series of specifications with different lengths; or the material of the sliding sleeve valve seat assembly and the sliding sleeve plug valve is chrome-molybdenum alloy steel ; or the fishing head 11 is made of ductile iron; the technology of the present invention can be one or a combination of several of the above-mentioned features.

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Abstract

The invention discloses a layered fracturing technology for a variable-length graded sliding sleeve, which conducts layered fracturing by adopting a graded sleeve production technology of more than ten grades by changing the length of each grade of a sliding sleeve groove and a sliding sleeve plug valve tooth block under the condition that the diameter of a sliding sleeve plug valve of each gradeof a variable-length graded sliding sleeve is unchanged. The variable-length graded sliding sleeve consists of a sliding sleeve plug valve and a sliding sleeve valve seat assembly, a movable tooth block is arranged on a body of the sliding sleeve plug valve, and two ends of the tooth block are respectively banded in the body by band springs; the sliding sleeve valve seat assembly consists of an upper joint, a stop screw, a seal ring, a jet hole, a shell, a shear pin and a sliding sleeve valve seat, wherein the sliding sleeve valve seat with a sliding sleeve groove on the inner wall is arranged in the shell and is fixed with the shell by the shear pin; and the tooth block corresponds to the sliding sleeve groove on the sliding sleeve valve seat.

Description

technical field [0001] The invention belongs to the petroleum and natural gas industry, and relates to a graded sliding sleeve technology, in particular to a variable-length graded sliding sleeve layered fracturing technology for a fracturing process, which replaces the original variable-diameter graded sliding sleeve technology on a construction pipe string. Background technique [0002] Among the mechanical layered fracturing construction technology, there is a non-moving string fracturing technology, that is, the variable diameter staged fracturing method. After each layer is fractured, it is only necessary to put in successively from the wellhead to increase the diameter step by step. The steel balls are used to open the graded fracturing sliding sleeves of each layer. After the steel balls block the lower channel of the sliding sleeves, the fracturing sand fluid enters the new layer through the outlet of the sliding sleeves to perform continuous layered fracturing. The ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/26E21B34/14
Inventor 孙虎周丰邓继学刘培润张敏魏建荣张冕苏敏文邓小强高红平赵小充
Owner BC P INC CHINA NAT PETROLEUM CORP
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