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Method and apparatus for determining fracture zone in rock formation

A technology for broken zones and strata, which is applied in earthwork drilling, wellbore/well components, and production fluids, etc. It can solve problems such as insufficient accuracy of fracture identification and difficult identification of small broken zones, and achieve the effect of enriching research methods

Active Publication Date: 2021-09-21
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Claims
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Problems solved by technology

Among them, the fractured zone logging identification has a high recognition rate for the fractured zone, and can effectively identify open fractures and breccia zones, but the identification accuracy of calcite-filled fractures is not enough
In addition, the seismic identification of the fracture zone can obtain the overall spatial distribution of the fracture zone in the rock formation, but due to the limitation of the resolution of seismic data, it is difficult to identify a single small fracture zone
[0004] On the whole, there is still a lack of an effective method for identifying fractured zones in rock formations, so as to better meet the needs of oilfield exploration and development

Method used

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  • Method and apparatus for determining fracture zone in rock formation
  • Method and apparatus for determining fracture zone in rock formation
  • Method and apparatus for determining fracture zone in rock formation

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Embodiment Construction

[0037] The technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. After reading the present invention, those skilled in the art Modifications to various equivalent forms of the present invention fall within the scope defined by the appended claims of the present application.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this application belongs. The terminology used herein in the description of the application is only for the purpose of describing specific embodiments, and is not intended to limit the application.

[0039] It should be noted that when an element is referred to as being “d...

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Abstract

The invention discloses a method and device for determining a fractured zone in a rock formation. The method comprises: setting a pressure sensor for obtaining pressure information of fracturing fluid in a perforation section corresponding to a fracturing pipe string; injecting a pressure sensor into the fracturing pipe string Fill up the fracturing fluid, then inject the fracturing fluid with a predetermined displacement, suppress the bottom hole with the formation fracture pressure, and form the first artificial fracture segment; and use the pressure sensor to obtain the current first pressure curve segment; continue to Injecting fracturing fluid at the predetermined displacement so that the first artificial fracture segment extends forward; and using the pressure sensor to obtain the current second pressure curve segment; when the fracturing fluid loss rate is greater than the injection rate, and the When the current pressure acquired by the pressure sensor suddenly drops, it means that the first artificial fracture segment is connected to the broken zone. The invention can accurately and effectively identify the broken zone in the rock formation, thereby better meeting the requirements of oilfield exploration and development.

Description

technical field [0001] The invention relates to the technical field of petroleum engineering, in particular to a method and a device for determining a broken zone in a rock formation. Background technique [0002] Fracture zones are bands of rock disrupted by haphazard cracks and fissures. Fracture zone data is a special geological body, and its structure is relatively complex. Generally, when the fractured zone is outcropped on the surface, it is easier to identify; but when the fractured zone is located underground, it is difficult to be identified, which causes many potential problems in the exploration and development of oilfields. Specifically, since the composition, thickness, and physical properties of some fracture zones will directly affect the extension mode of artificial fractures and the development of remaining oil, the identification and description of fracture zones has become a scientific and practical problem that needs to be solved urgently. difficult iss...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B49/00E21B43/26
CPCE21B43/26E21B49/00
Inventor 张广清郑学林
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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