Fracturing method

A fracturing and pressure technology, applied in the direction of earthwork drilling, production fluid, wellbore/well components, etc., can solve the problems of improving the applicability of volume fracturing, the development of natural fractures, and not involving the structural stress field

Inactive Publication Date: 2021-09-07
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0004] However, the successful operation of volume fracturing has extremely strict requirements on reservoir conditions, such as strong brittleness, developed natural fractures, and small in-situ stress difference. Most reservoirs are difficult to meet the construction standards of volume fracturing.
However, the research in the prior art focuses on the improvement and optimization of the existing process technology itself to improve the effect of volume fracturing, but does not involve the structural stress field to improve the applicability of volume fracturing in different reservoir conditions.

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Embodiment Construction

[0034] The present invention will be further described below in conjunction with accompanying drawing.

[0035] figure 1 A process flow diagram of the fracturing method according to the present invention is shown. The fracturing method is to provide a fracturing method for horizontal wells. Specifically, as in step 1 of S1, the perforation operation is first performed in the horizontal well section 1, so as to form the perforation 3 extending into the formation 2 in the horizontal well section 1, such as image 3 shown. As in step 2 of S2, then, formation improvement operations are performed to form a new stress field in the near-wellbore zone in formation 2 (such as Figure 2a , 2b and 4), and open the micro-crack 4 (such as Figure 5 shown). As in step 3 of S3, finally, on the basis of step 2, perform hydraulic fracturing operation, thereby forming the main fracture 5, as Figure 6 shown.

[0036] In this fracturing method, before the hydraulic fracturing operation, ...

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Abstract

The invention provides a fracturing method for a horizontal well. The fracturing method comprises the steps that 1, perforation is conducted on a horizontal section of the horizontal well; 2, the stress gradient of a near wellbore zone is improved, and microfractures are formed in the stratum; and 3, hydraulic fracturing operation is carried out to generate main fractures, according to the fracturing method, before fracturing operation is carried out, the operation of improving the stratum is carried out firstly to form a new stress field and open micro fractures in the vicinity of a near wellbore zone, the reservoir which is not originally suitable for volume fracturing can also achieve the volume fracturing transformation effect, and good practicability and popularization value are achieved.

Description

technical field [0001] The invention relates to the field of oil and gas field development engineering, in particular to a fracturing method for horizontal wells. Background technique [0002] Volume fracturing refers to the continuous expansion of natural fractures and shear slip of brittle rocks in the process of hydraulic fracturing, forming a fracture network in which natural fractures and artificial fractures intersect, thereby increasing the volume of stimulation, increasing initial production and final recovery Rate. [0003] Volume fracturing technology is usually used in horizontal wells in order to obtain the effect of large-scale stimulation of the reservoir. For example, Zhu Weiyao (2018) applied for the patent "Tight oil horizontal well three-dimensional fracture network cluster network fracturing optimization method (CN201811146295.8)", which provides a fracture network optimization evaluation method based on seepage productivity, and then optimizes the fractu...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/26E21B43/11
CPCE21B43/26E21B43/11
Inventor 李小龙李凤霞王海波贺甲元周彤刘长印
Owner CHINA PETROLEUM & CHEM CORP
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