Novel method for analyzing reservoir physical properties by using pressure drop section data in shale gas reservoir fracturing construction

A technology for physical properties of shale gas reservoirs and reservoirs, which is used in earth-moving drilling, production of fluids, wellbore/well components, etc. The effect of utilization

Inactive Publication Date: 2015-04-08
四川奥陶石油科技有限公司
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Problems solved by technology

[0004] The purpose of the present invention is to provide a new method for analyzing the physical properties of the reservoir by using the pressure drop data of the shale gas reservoir fracturi

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  • Novel method for analyzing reservoir physical properties by using pressure drop section data in shale gas reservoir fracturing construction
  • Novel method for analyzing reservoir physical properties by using pressure drop section data in shale gas reservoir fracturing construction
  • Novel method for analyzing reservoir physical properties by using pressure drop section data in shale gas reservoir fracturing construction

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Embodiment Construction

[0012] The present invention will be described in detail below in combination with specific embodiments.

[0013] The present invention carries out according to the following steps:

[0014] ①: From the fracturing construction curve, accurately read the oil pressure and displacement data during the fracturing process with the construction time, and use the wavelet transform method to analyze the oil pressure (unit MPa) and displacement (m 3 / min), time (hour) data are denoised, and abnormal data with a fluctuation range greater than 1% are eliminated, and the above data are redefined as oil pressure (unit MPa), time (hour), displacement (m 3 / min) array, and the serial numbers between the data correspond one-to-one.

[0015] ②: Select the first data P before the pressure curve begins to decline wf1 , according to the value of the first inflection point of the slope of the pressure drop curve after stopping the pump is P wf2 , the value of the second inflection point is P w...

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Abstract

The invention discloses a novel method for analyzing reservoir physical properties by using pressure drop section data in shale gas reservoir fracturing construction. According to the method, change data of oil pressure and discharge capacity along with the construction time in the fracturing process is accurately read from a fracturing construction curve, and abnormal data with the fluctuation amplitude greater than 1 percent is removed; dimensionless pressure is defined, and the pressure drop section time is converted into a dimensionless form; and a theoretical dimensionless pressure value is calculated, the dimensionless pressure data is compared with the theoretical dimensionless pressure value, and if the error exceeds 1 percent, a trial and error method is used for re-adjusting the reservoir physical property permeability, the dimensionless storage coefficient, the single-well control radius and the dimensionless analytic parameter coefficient until the calculation precision is reached. The novel method has the beneficial effects that the pressure drop section data in the shale gas reservoir fracturing construction is used for analyzing the result accuracy of the reservoir physical properties, and the data utilization rate of the fracturing construction data is improved.

Description

technical field [0001] The invention belongs to the field of post-pressurization effect evaluation of shale gas reservoirs, and relates to a pressure drop data analysis method, in particular to a new method for analyzing reservoir physical properties by using the data of the pressure drop section of shale gas reservoir fracturing construction. Background technique [0002] The fracturing construction process is a typical injection pressure drop process. The pressure drop section data during the fracturing fluid flowback process can basically reflect the formation and stimulation information. The role of the pump stop pressure drop curve in the understanding of reservoir physical properties in the process of fracturing construction is studied. The pump stop pressure during the fracturing process is the wellhead pressure at the instant the pump is stopped. At this time, the wellbore friction has been eliminated. It is only different from the bottom hole pressure by the hydrost...

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Application Information

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IPC IPC(8): E21B43/26E21B49/00
Inventor 李成勇伊向艺张燃曹海涛罗毅周珺
Owner 四川奥陶石油科技有限公司
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