Multi-stage, multi-gap and multi-section fracturing method for horizontal well

A technology of staged fracturing and horizontal well section, which is applied in earth-moving drilling, wellbore/well components, and production fluids, etc. It can solve the problem of limited toe construction displacement, insufficient reservoir stimulation, and impact on single well productivity. and other problems, to achieve the effect of ensuring the fracturing construction effect, the construction effect is obvious, and the construction cost is low.

Active Publication Date: 2015-04-01
CHINA PETROLEUM & CHEM CORP +1
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AI Technical Summary

Problems solved by technology

In addition, due to the large number of downhole tools for multi-section construction, the choke friction during the construction of long horizontal section horizontal wells will limit the construction displacement at the toe end, resulting in insufficient reservoir stimulation and affecting the productivity of a single well

Method used

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Effect test

Embodiment Construction

[0018] The present invention comprises the following sequential steps:

[0019] 1). After the completion of the casing cementing well, determine the number of fracturing stages and the number of stages according to the oil and gas show in the horizontal well section, and determine the setting position of the staged packer and the position of the staged perforation;

[0020] 2). Under mud conditions, the directional perforation tool is lowered according to the number of grading bars. The directional perforation tool is mainly composed of a screen tube, a delayed detonator, a safety gun and a perforating gun that are assembled together from top to bottom. ;Adopt the directional perforation process, each cluster of perforations is 0.5 meters, the number of perforations in each stage is 7-10, and the diameter of the holes is 8mm. The design determines the reasonable throttling pressure difference of each cluster;

[0021] 3). After the perforation is completed, the segmented tool...

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Abstract

The invention discloses a multi-stage, multi-gap and multi-section fracturing method for a horizontal well. The method comprises the steps of 1) determining the quantity of fracturing sections and grading number after the casing cementing and completion, and determining setting positions of sectional packers and a grading perforation position; 2) performing directional perforation process to perforate 7 to 10 holes at each grade under a slurry condition, wherein the holes are 8mm in diameter; 3) separating the internal space of a wellbore casing by a segmentation tool after perforation, so as to achieve horizontal well segmentation; 4) determining the maximum discharge, construction pressure and other sand fracturing parameters during fracturing construction; 5) feeding ball to set all packers, and sequentially fracturing a plurality of horizontal sections according to the matching relationship between a starting ball, a sand injection sliding sleeve and a ball receiving seat, so as to achieve multi-stage multi-gap fracturing of the horizontal well. With the adoption of the method, the fracturing reconstruction which increases artificial gaps is done on the premise that the packers are not increased; therefore, the construction effect can be ensured, and moreover, the working degree in the whole well section can be obviously raised, and the cost of fracturing construction is low.

Description

technical field [0001] The invention relates to oil and gas well fracturing stimulation technology, in particular to a multi-stage, multi-fracture and staged fracturing method for horizontal wells. Background technique [0002] In recent years, the use of horizontal well technology combined with staged fracturing technology has become the most effective means for efficient development of tight oil and gas reservoirs. The staged fracturing reconstruction of conventional horizontal wells realizes multi-stage fracturing of horizontal well sections by increasing the number of packers and sandblasting sliding sleeves, forming multiple sand-filled fractures to expand the drainage area of ​​oil and gas wells, thereby increasing single well productivity . Due to the limitation of the wellbore size of the horizontal well and the outer diameter of the tool, this method can only determine the number of stages based on the number of packers, and cannot increase the number of artificial...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/26
CPCE21B43/116E21B43/26
Inventor 戚斌赵祚培慈建发黄禹忠刘林王兴文宋燕高李永明刘斌康杰
Owner CHINA PETROLEUM & CHEM CORP
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