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Method for improving complexity of fracture and construction efficiency of horizontal well

A technology with high construction efficiency and horizontal wells, which is applied in the field of oil and gas field exploration and development, and can solve the problems of small drainage volume and low complexity of fracturing fractures

Inactive Publication Date: 2015-06-10
PETROCHINA CO LTD
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for improving the complexity and construction efficiency of horizontal well fractures, so as to solve the problems of low complexity and small discharge volume of existing horizontal well fracturing fractures.

Method used

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  • Method for improving complexity of fracture and construction efficiency of horizontal well

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Embodiment

[0011] 1. Deployment of horizontal wells

[0012] Three horizontal wells are deployed on the same well site, and each adjacent wellbore 1 is parallel to each other, and each wellbore 1 is perpendicular to the maximum principal stress direction 3 of the formation;

[0013] 2. Select the location of the perforation section

[0014] The perforation section position of each horizontal well (that is, the fracture initiation site) and the perforation section position of another adjacent well are arranged alternately, and the interval between the fracturing sections of each well is set between 100 and 150 meters.

[0015] 3. Hydraulic fracturing

[0016] Use a set of fracturing units to fracture the first section of the first well with a displacement of 4.0m3 / min, then immediately fracture the first section of the adjacent well, and so on, successively alternately fracture the two adjacent wells .

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Abstract

The invention discloses a method for improving the complexity of a fracture and the construction efficiency of a horizontal well, and is designed to solve the problems, such as low complexity and small discharge volume of the fractured fracture of the horizontal well. The method is characterized in that a plurality of the horizontal wells are deployed in the same well site, shafts of the horizontal wells are parallel mutually, and each shaft is perpendicular to a maximum principal stress direction of a stratum; positions of perforated intervals of each adjacent well are distributed in a staggered manner; each adjacent well is fractured in sequence in a staggered manner. In the process of fracturing, as each shaft is subjected to stress interference caused by staggered fracturing in sequence, a large amount of high-complexity microfractures in staggered distribution are generated on both sides of each fracture, thus the reconstruction volume of an oil layer is increased, and the single-well yield is improved. In addition, the intervals between the fracturing sections of the horizontal wells are lengthened, thus the number of the fracturing sections can be decreased, the single-well fracturing cycle can be shortened, and the construction efficiency can be greatly enhanced.

Description

technical field [0001] The invention relates to a method for improving the complexity and construction efficiency of horizontal well fractures, and belongs to the technical field of oil and gas field exploration and development. Background technique [0002] At present, the conventional horizontal well fracturing technology has the following characteristics: the direction of fracture extension forms a certain angle with the horizontal wellbore; the fractures that are extruded are symmetrically distributed on both sides of the wellbore; the shape of the fractures is relatively regular and extends linearly along the direction of the maximum principal stress ; One adopts multi-stage fracturing reformation, the interval between stages is 50-80 meters, and the number of fracturing stages is large. [0003] The above-mentioned conventional methods have the following limitations: the fractures extend linearly, the complexity of the fractures is low, the contact area between the fra...

Claims

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Application Information

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IPC IPC(8): E21B43/26
CPCE21B43/26
Inventor 马兵慕立俊赵振峰李宪文张矿生唐梅荣樊凤玲曹宗熊杨晓刚张彦军
Owner PETROCHINA CO LTD
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