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A Rapid Prediction Method of Multistage Fracturing Fracture Propagation Pattern in Horizontal Wells

A technology of fracture propagation and prediction method, which is applied in the field of rapid prediction of fracture propagation form in multi-stage fracturing of horizontal wells, can solve problems affecting fracturing effect and post-fracture productivity, and achieve the effect of improving stimulation effect and uniform fracture growth

Active Publication Date: 2022-03-11
SOUTHWEST PETROLEUM UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for multi-fractures to propagate simultaneously, due to the interaction caused by the stress shadow effect among the multi-fractures, some fractures may be suppressed during the fracture propagation process, resulting in non-uniform propagation of multiple fractures, which greatly affects the compressive strength. cracking effect and post-fracture productivity

Method used

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  • A Rapid Prediction Method of Multistage Fracturing Fracture Propagation Pattern in Horizontal Wells
  • A Rapid Prediction Method of Multistage Fracturing Fracture Propagation Pattern in Horizontal Wells
  • A Rapid Prediction Method of Multistage Fracturing Fracture Propagation Pattern in Horizontal Wells

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Experimental program
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Effect test

Embodiment 1

[0192] The numerical simulation method is used to simulate the fracture propagation form, and the basic parameters of the target well are set:

[0193]

[0194] The parameters E and ν represent rock elastic modulus and Poisson's ratio, respectively, while K Ic is the fracture toughness of the rock, μ is the dynamic viscosity of the fracturing fluid, Q is the total inflow of fluid pumped into the wellbore, and Z represents the stage length. These parameters meet the following conditions, T is the pumping time:

[0195]

[0196] In the case of uniform crack spacing (h 1 =5m, the Z-axis coordinate z of the fracture plane 1 =0m,z 2 =5m,z 3 = 10m, z 4 = 15m, z 5 =20m), the simulation result of the model of the present invention is as figure 2 shown. From figure 2 It can be seen that the expansion of the outer two cracks in the crack array is dominant, and the other cracks are suppressed. Some time after the start of fracturing, the inflow at the entrance of the tw...

Embodiment 2

[0200] The final total surface area of ​​fractures is directly proportional to the effect of fracturing stimulation, which can be used as an index to measure the effect of fracturing stimulation. The influencing factors include the number of perforations per cluster, the diameter of perforation holes, rock elastic modulus, the viscosity of fracturing fluid, Poisson's ratio of rock, density of fracturing fluid, length of fracturing section, construction displacement, number of perforation clusters, etc. In this embodiment, the influence of the number of perforations per cluster, the viscosity of the fracturing fluid, and the number of perforation clusters on the total surface area is analyzed by a single factor analysis method, and the total surface area is calculated by the following formula:

[0201]

[0202] (1) Number of perforations per cluster: In the case of uniform fracture spacing, the rock elastic modulus E = 9.5GPa, the rock Poisson's ratio v = 0.25, the fracturing...

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Abstract

The invention discloses a method for quickly predicting the expansion form of multi-stage fracturing fractures in horizontal wells, comprising the following steps: establishing a multi-fracture synchronous expansion model with global energy balance, and solving it to obtain the width and radius of each fracture at each time , inlet pressure and inlet flow rate, so as to obtain the multi-stage fracturing fracture propagation form of the horizontal well. The present invention couples the influence of stress shadow and fracture growth through the global energy balance equation, thereby calculating the fluid distribution among multiple fractures, and obtaining the stress interaction through the induced stress field model, so as to establish a perfect multi-fracture synchronous expansion model, It helps to optimize the selection of construction parameters during on-site construction, can effectively improve the effect of hydraulic fracturing stimulation, and is of great significance to the development of shale reservoirs and other unconventional reservoirs.

Description

technical field [0001] The invention relates to the technical field of oil and gas exploitation, in particular to a method for quickly predicting the expansion form of multi-stage fracturing fractures in horizontal wells. Background technique [0002] my country is rich in unconventional oil and gas resources, which have become the main force for increasing oil and gas reserves and production. Among them, tight gas resources account for a large proportion, and multi-stage fracturing of horizontal wells is the key technology for developing such resources. The porosity and permeability of unconventional oil and gas resources are generally very low, but the multi-stage fracturing technology of horizontal wells can effectively crush the reservoir and form multiple hydraulic fractures that expand simultaneously, which can greatly improve the producing degree of the reservoir . However, for multi-fractures to propagate simultaneously, due to the interaction caused by the stress ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/26E21B49/00G06F30/20G06F17/10
CPCE21B43/26E21B49/00G06F30/20G06F17/10
Inventor 刘彧轩杨兴贵郭建春蒲麒兵陈天翔王世彬
Owner SOUTHWEST PETROLEUM UNIV
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