Method for predicting pad-acid-fracturing crack flow conductivity distribution of carbonate rock

A conductivity and carbonate rock technology is applied in the field of predicting the conductivity distribution of carbonate rock pre-fluid acid fracturing fractures, which can solve the problem that the conductivity distribution cannot be obtained, the fracture conductivity prediction is difficult to achieve, and the fracture conductivity is difficult to predict. Size limit and other issues

Active Publication Date: 2019-11-01
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology

The indoor core experiment method is the most intuitive and simple way to obtain the fracture conductivity, but the disadvantage is that it is difficult to predict the fracture conductivity in the real formation environment, and is limited by the size of the experimental core sample

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  • Method for predicting pad-acid-fracturing crack flow conductivity distribution of carbonate rock
  • Method for predicting pad-acid-fracturing crack flow conductivity distribution of carbonate rock
  • Method for predicting pad-acid-fracturing crack flow conductivity distribution of carbonate rock

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Embodiment Construction

[0090] The present invention will be further described below in conjunction with the accompanying drawings and specific examples.

[0091] Various parameters are shown in Table 1:

[0092] All kinds of parameters for calculating the diversion capacity in the embodiment of table 1

[0093]

[0094] A method for predicting the conductivity distribution of carbonate pre-fluid acid fracturing fractures, comprising the following steps in sequence:

[0095] (1) The pre-fluid acid fracturing process is divided into fracturing and fracture creation period and acid injection period according to the construction time, and the corresponding construction time is t 1 and t 2 , using the two-dimensional PKN fracture extension model to simulate the pre-fluid acid fracturing fracture extension process, by solving the PKN model to obtain the fracturing period t 1 crack length at end crack width and the in-slit pressure p 0 (The calculation results are as follows figure 1 and figu...

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Abstract

The invention relates to a method for predicting pad-acid-fracturing crack flow conductivity distribution of carbonate rock. The method comprises steps as follows: a pad-acid-fracturing process is divided into a fracturing crack making period and an acid injection period, a crack extension process of the fracturing crack making period is simulated by adopting a two-dimensional PKN crack extensionmodel, and crack length, crack width and pressure p0 in the crack when the fracturing crack making period t1 is ended are obtained; in the acid injection period t2, t2 is equally divided into n time steps, and concentration of acid liquor in the crack, acid-corroded crack width and flowing pressure p1 of acid liquor in the crack in the crack length direction when the first time step is ended are obtained; the concentration of acid liquor in the crack, the acid-corroded crack width and the flowing pressure pj (j=1,2,3,...,n) of acid liquor in the crack when any time step in the acid injection period t2 is ended are obtained; fracture flow conductivity distribution wkf after the pad-acid-fracturing crack is closed is calculated. With the adoption of the method, the flow conductivity distribution of the acid-corroded crack in the crack length direction can be accurately predicted, the pad-acid-fracturing design scheme of the carbonate rock is optimized, and the development effect of the carbonate rock is improved.

Description

technical field [0001] The invention relates to the field of acidizing and fracturing reservoir reconstruction for oil and gas field development, in particular to a method for predicting the distribution of fluid conductivity of carbonate rock pre-fluid acid fracturing fractures. [0002] technical background [0003] Carbonate reservoir is an important reservoir of oil and gas resources and has great potential for development. Carbonate reservoirs are mainly composed of limestone and dolomite, and the burial depth is generally more than 5000m (Qi Baoquan, Zhao Zuoan, He Hongju, et al. Using the comprehensive evaluation index of well logging reservoir quality to judge the effectiveness of reservoirs—a case study in the Sichuan Basin An example of Permian Qixia Formation in western China[J]. Natural Gas Industry, 2018, 38(02): 25-32). This type of reservoir has low porosity, permeability and strong heterogeneity, and it is difficult to exploit oil and gas resources under natu...

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Application Information

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IPC IPC(8): E21B43/27E21B49/00G06F17/50
CPCE21B43/26E21B49/00
Inventor 赵金洲王涛李勇明彭瑀刘福建
Owner SOUTHWEST PETROLEUM UNIV
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