Fast prediction method of expansion forms of multi-stage fracturing fractures of horizontal well

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

Active Publication Date: 2020-10-02
SOUTHWEST PETROLEUM UNIV
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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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  • Fast prediction method of expansion forms of multi-stage fracturing fractures of horizontal well
  • Fast prediction method of expansion forms of multi-stage fracturing fractures of horizontal well
  • Fast prediction method of expansion forms of multi-stage fracturing fractures of horizontal well

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Effect test

Embodiment 1

[0193] The numerical simulation method is used to simulate the fracture propagation form, and the basic parameters of the target well are set:

[0194]

[0195] 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:

[0196]

[0197] 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

[0201] 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:

[0202]

[0203] (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 fast prediction method of expansion forms of multi-stage fracturing fractures of a horizontal well. The method comprises the following steps of building a global energy balance multi-fracture synchronous expansion model; solving the model; and obtaining the width, radius, inlet pressure and inlet flow rate of each fracture at each moment so as to obtain the expansion forms of the multi-stage fracturing fractures of the horizontal well. Through a global energy balance equation, the stress shallow influence is coupled with the fracture increase, so that the fluid distribution among various fractures is calculated; the stress mutual interaction is obtained by inducing a stress field model so as to build a complete multi-fracture synchronous expansion model; the optimization selection on construction parameters in the field construction process is facilitated; the hydraulic fracturing production increase effect can be effectively improved; and important significance is realized on 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. Generally, the porosity and permeability of unconventional oil and gas resources are 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 Applications(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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