Pulse type fracturing construction process for liquid self-supporting highway

A construction technology and self-supporting technology, which can be used in the fields of mining fluids, drilling compositions, cleaning tools, etc., and can solve the problems of large amount of phase change materials, poor solid proppant effect, and formation damage.

Active Publication Date: 2020-10-27
青岛大地新能源技术研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention solves the poor effect of solid proppant in the prior art, which is prone to sand plugging, the large amount of phase change materials used in the existing phase change fracturing fluid construction technology, the high cost, easy to cause formation damage, and no high-speed channel fracturing effect , and there is no problem of effective fracturing construction technology for liquid self-supporting fracturing fluids, providing a liquid self-supporting technology to achieve high-speed channel pulse fracturing construction technology

Method used

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  • Pulse type fracturing construction process for liquid self-supporting highway
  • Pulse type fracturing construction process for liquid self-supporting highway
  • Pulse type fracturing construction process for liquid self-supporting highway

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0092] A liquid self-supporting high-speed channel fracturing fluid pulse fracturing process, comprising the following steps:

[0093] (1) Prepare B1 liquid: mix uniformly with 100 parts by weight of guar gum fracturing fluid and 3 parts of potassium chloride to obtain B1 liquid;

[0094] Preparation of high-density medium-top liquid B': mix 100 parts by weight of guar gum fracturing fluid and 30 parts of potassium chloride to obtain B' liquid;

[0095] (2) Create cracks: use the crack network simulation device disclosed in the patent CN110725675A to simulate cracks;

[0096] (3) While making cracks, prepare liquid A and liquid B on site: use 100 parts by weight of bisphenol A epoxy resin E-51, mix evenly with 10 parts of ethanol diluent, add 0.1 part of polyvinyl alcohol fiber to mix, Then add 25 parts of triethylenetetramine curing agent and mix to obtain liquid A; mix the above liquid B1 with 0.3 part of organoboron crosslinking agent crosslinking agent and 0.2 part of pol...

Embodiment 2

[0110] In order to further verify the applicability of the present invention, the ground outcropping rock block is used as the experimental material, and the on-site construction process is simulated by a core flow simulation device. Two groups of experiments were used for comparison, one group used variable density pulse injection fluid self-supporting fracturing technology, and the other group used continuous single injection of A / B mixed fluid self-supporting fracturing technology.

[0111] Among them, the formula of the variable-density pulsed liquid self-supporting fracturing fluid is: liquid A: resin (bisphenol A epoxy resin E-51 and bisphenol F epoxy resin compounded at a mass ratio of 1:1), diluted with acetone agent, triethylenetetramine curing agent, and polyvinyl alcohol fiber are prepared according to the mass ratio of 100:8:20:0.1. Liquid B: Emulsion fracturing liquid, sodium chloride, and polyvinyl alcohol fibers are prepared in a mass ratio of 100:3:0.2. B' sol...

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Abstract

The invention provides a pulse type fracturing construction process for a liquid self-supporting highway. The process includes the following steps of preparing curable liquid A, low-density carrying liquid B and high-density middle-roof liquid B' on site when fractures are made, mixing the liquid A with the liquid B immediately after the fractures are made, injecting the A/B mixed liquid and the liquid B' into a stratum in a pulse mode until fracturing ends, injecting displacing liquid into a shaft to replace the A/B mixed liquid and the liquid B' in the stratum, and then stopping a pump, closing a well and holding the pressure for 40-180 min. A mixing method of the liquid A and the liquid B includes the step of jetting the liquid A into the liquid B, wherein a jet port is located below the liquid surface of the liquid B, and the liquid A forms evenly-distributed centimeter-level liquid particles in the liquid B. The process can reduce the consumption of the liquid A, further improvesthe suspension property and carrying property of the liquid B, further enhances the flow guide capacity, is beneficial for cleaning a well wall or an oil tube, omits the wall hanging property, and reduces the construction risk.

Description

technical field [0001] The invention belongs to the technical field of oil and gas field development in the petroleum industry, and relates to a pulse type fracturing construction technology for realizing a liquid self-supporting high-speed passage. Background technique [0002] According to the characteristics of low-permeability oil and gas reservoirs, hydraulic fracturing is commonly used to develop fractures with high conductivity through hydraulic fracturing, so as to change the seepage capacity of the reservoir and achieve the effect of increasing production. [0003] The current hydraulic fracturing development technology first opens formation fractures through pre-hydraulic pressure, and then injects sand-carrying fluid containing solid proppant. After the fracture is closed, the solid proppant carried by the sand-carrying fluid plays the role of supporting the fracture. Due to the high density of the proppant, after the fracture is closed, most of the proppant is la...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/26E21B43/267E21B37/06C09K8/68C09K8/88
CPCE21B43/26E21B43/267E21B37/06C09K8/68C09K8/685C09K8/882C09K8/885C09K8/887C09K2208/08
Inventor 刘化普温庆志史胜龙房堃张东晓
Owner 青岛大地新能源技术研究院
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