Method for monitoring hydraulic fracturing cracks based on pressure fluctuation of closed wellbore

A wellbore pressure and hydraulic fracturing technology, applied in surveying, earthmoving, wellbore/well components, etc., can solve problems such as reducing the success rate of construction, lack of, and difficulty in interpreting and analyzing measured data

Active Publication Date: 2021-03-30
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

However, this technology still lacks an effective theoretical basis, and the corresponding relationship between the pressure change of the closed well and the fracture expansi

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  • Method for monitoring hydraulic fracturing cracks based on pressure fluctuation of closed wellbore
  • Method for monitoring hydraulic fracturing cracks based on pressure fluctuation of closed wellbore
  • Method for monitoring hydraulic fracturing cracks based on pressure fluctuation of closed wellbore

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Embodiment Construction

[0109] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0110] It should be noted that if there is a directional indication (such as up, down, left, right, front, back...) in the embodiment of the present invention, the directional indication is only used to explain the position in a certain posture (as shown in the accompanying drawing). If the specific posture changes, the directional indication will also change accordingly.

[0111] In addition, if there are descriptions involving "first", "second" a...

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Abstract

The embodiment of the invention relates to a method for monitoring hydraulic fracturing cracks based on pressure fluctuation of a closed wellbore. The method comprises the following steps of monitoring the hydraulic fracturing cracks based on the pressure fluctuation of the closed wellbore according to drilling and completion and logging stratum information, acquiring wellbore parameters, geological parameters and fracturing construction and well completion parameters of a fracturing well and a closed well, and establishing a physical model for crack propagation and closed wellbore pressure monitoring; establishing a 'shaft-plane three-dimensional multi-crack' full-coupling fracturing design calculation model; establishing a calculation model for volume and pressure fluctuation of a closedwellbore in the fracturing process; carrying out smoothing processing according to pressure data calculated in step S30, drawing an evolution diagram of pressure and pressure change rate of the closed wellbore and the injection time of the fracturing well, and establishing a typical plate of the pressure and the pressure change rate of the closed wellbore; and according to the forward models in the step S20 and the step S30, adopting an optimization algorithm to establish an inversion model of closed wellbore pressure monitoring data, and acquiring fitting stratum parameters of actual signals.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of oil and gas field development, in particular to a method for monitoring hydraulic fracturing fractures based on pressure fluctuations in closed well bores. Background technique [0002] Horizontal well staged multi-cluster fracturing is an important technology for the development of low-permeability and unconventional oil and gas reservoirs. At present, microseismic, inclinometer, optical fiber monitoring and other means are usually used to monitor the fracture shape during the fracturing process, so as to obtain the fracture shape during the fracturing process and optimize the construction design in real time. These monitoring methods have their own advantages, but they are generally high-cost monitoring technologies, which occupy a large operating expenditure in oil and gas well fracturing, which is not conducive to the development requirements of low-cost construction operatio...

Claims

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Application Information

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IPC IPC(8): E21B47/00E21B43/26
CPCE21B47/00E21B43/26
Inventor 陈铭郭天魁刘晓强齐宁徐建春刘德新罗明良吴飞鹏王森王文东孙永鹏
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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