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Oil and gas reservoir acid fracturing method

A technology of oil and gas reservoirs and acid fracturing, which is applied in chemical instruments and methods, earthwork drilling, production fluids, etc., and can solve problems such as unsatisfactory oil and gas output, small volume, and limited reservoir communication

Inactive Publication Date: 2021-01-12
PETROCHINA CO LTD
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0003] In actual acid fracturing, the fracturing fluid usually extends forward from the end of the fracture along the direction of the fracture, and the height of the fracture is usually constant or small, resulting in a small overall volume of the fracture and the communication with the reservoir. Limited, the final oil and gas output is not ideal

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  • Oil and gas reservoir acid fracturing method

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Embodiment Construction

[0031] In order to make the purpose, technical solution and advantages of the present disclosure clearer, the implementation manners of the present disclosure will be further described in detail below in conjunction with the accompanying drawings.

[0032] Unless otherwise defined, the technical terms or scientific terms used herein shall have the usual meanings understood by those having ordinary skill in the art to which the present disclosure belongs. "First", "second", "third" and similar words used in the specification and claims of this disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components . Likewise, words like "a" or "one" do not denote a limitation in quantity, but indicate that there is at least one. Words such as "comprises" or "comprising" and similar terms mean that the elements or items listed before "comprising" or "comprising" include the elements or items listed after "comprising" or "comprising" a...

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Abstract

The invention provides an oil and gas reservoir acid fracturing method, and belongs to the technical field of oil and gas reservoir development. The method comprises the steps that after an acid fracturing crack is formed, second fracturing fluid mixed with a temporary plugging agent is injected into the acid fracturing crack, and the acid fracturing crack cannot extend in the original transverseextending direction of the acid fracturing crack; third fracturing fluid mixed with packing particles is injected, the packing particles float to the uppermost portion of the second fracturing fluid,and the acid fracturing crack is prevented from extending in the original transverse extending direction and the longitudinal upper portion; and finally, fourth fracturing fluid is injected to mainlyimpact the lower surface of the acid fracturing crack, the height of the acid fracturing crack is continuously increased downwards in the longitudinal direction, finally, the transverse extending length of the acid fracturing crack is guaranteed, meanwhile, the height of the acid fracturing crack in the longitudinal direction is effectively increased, the overall size of the acid fracturing crackis increased, the acid fracturing crack can achieve good communication with a reservoir in the transverse direction and the longitudinal direction, and the finally-produced oil and gas yield is also increased.

Description

technical field [0001] The disclosure relates to the technical field of oil and gas reservoir development, in particular to an acid fracturing method for oil and gas reservoirs. Background technique [0002] Acid fracturing is the mainstream technology for stimulation of carbonate reservoirs. During acid fracturing, fracturing fluid is pumped under high pressure, and the fracturing fluid breaks open natural fractures or presses open reservoirs to form artificial fractures. [0003] In actual acid fracturing, the fracturing fluid usually extends forward from the end of the fracture along the direction of the fracture, and the height of the fracture is usually constant or small, resulting in a small overall volume of the fracture and the communication with the reservoir. limited, and the final output of oil and gas is not ideal. Contents of the invention [0004] Embodiments of the present disclosure provide an acid fracturing method for oil and gas reservoirs, which can i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/27E21B43/26E21B33/12C09K8/516
CPCE21B43/26E21B43/261C09K8/516
Inventor 王洋周长林张华礼陈伟华叶颉枭李金穗曾冀黄馨何婷婷曾嵘
Owner PETROCHINA CO LTD
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