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Method for calculating trilinear productivity of shale oil reservoir staged fracturing horizontal well

A technology of staged fracturing and productivity calculation, applied in the directions of calculation, computer-aided design, design optimization/simulation, etc., can solve the problems of large section spacing and high sanding strength at the crack end, and achieve the effect of accurate prediction

Active Publication Date: 2021-06-25
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology

However, when staged fracturing is performed, the interval between stages is usually relatively large, and the hydraulic fracturing cannot affect the entire area between the two stages, and there are unreacted areas; and the sanding method of the fracturing p

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  • Method for calculating trilinear productivity of shale oil reservoir staged fracturing horizontal well
  • Method for calculating trilinear productivity of shale oil reservoir staged fracturing horizontal well
  • Method for calculating trilinear productivity of shale oil reservoir staged fracturing horizontal well

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Embodiment 1

[0239] A kind of shale oil reservoir segmental fracturing horizontal well trilinear productivity calculation method of the present invention comprises the following steps:

[0240] Obtain the basic parameters of a shale oil block X:

[0241] Table 1 X block basic parameter table

[0242]

[0243]

[0244] According to the basic parameters in Table 1, the linear seepage physical model of the three zones (reformed zone, unreformed zone, and fractured zone) is established, as shown in figure 1 shown. Model assumptions: the horizontal well is located in the center of a closed box-shaped rectangular reservoir, and the hydraulic fractures run through the reservoir; transverse fractures of equal width are uniformly distributed along the horizontal wellbore; both fluid and rock are in a slightly compressible state; The fluid in the stimulated area flows linearly into the hydraulic fractures, and then linearly flows into the wellbore through the fractures, and no fluid flows in...

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Abstract

The invention discloses a method for calculating trilinear productivity of a shale oil reservoir staged fracturing horizontal well. The method comprises the steps of obtaining basic parameters of a target stratum; establishing a dimensionless yield solution model of a single crack in the Laplace space; according to the basic parameters of the target stratum and the dimensionless yield solution model of the single fracture in the Laplace space, obtaining the dimensionless yield in the real space through flow superposition principles and Stehfest numerical inversion; and obtaining the yield of the shale oil reservoir staged fracturing horizontal well according to a dimensionless yield definition formula. According to the method, the permeability change of a hydraulic fracture and an unmodified area of staged fracturing are fully considered, and a three-area linear seepage model based on the variable fracture permeability is established; the provided method for calculating trilinear productivity of a shale oil reservoir staged fracturing horizontal well is comprehensive in consideration; a calculation result is closer to the actual situation in oil and gas field development, and the yield of the staged fractured horizontal well can be predicted more accurately.

Description

technical field [0001] The invention relates to a three-linear productivity calculation method for staged fracturing horizontal wells in shale oil reservoirs, and belongs to the technical field of unconventional oil and gas stimulation and transformation. Background technique [0002] The world is rich in shale oil resources. According to data from the U.S. Energy Information Administration (EIA) and Advanced Resources International (ARI), by the end of 2017, the total global shale oil geological resources were 936.835 billion tons, and the technically recoverable resources were 61.847 billion tons. China's technologically recoverable resources are 4.393 billion tons, accounting for about 6% of the world's total, ranking third in the world. At present, the development of shale oil mainly relies on horizontal well + staged fracturing technology. Through various parameters of reservoirs and fractures, the productivity of horizontal wells can be calculated, which has guiding ...

Claims

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Application Information

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IPC IPC(8): G06F30/28G06F113/08G06F119/14
CPCG06F30/28G06F2113/08G06F2119/14
Inventor 任岚孙映林然赵金洲蒋豪唐登济王振华任千秋
Owner SOUTHWEST PETROLEUM UNIV
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