Carbon dioxide energy-enhancing variable displacement mixed injection fracturing method

A carbon dioxide and liquid carbon dioxide technology, applied in earthwork drilling, design optimization/simulation, and fluid production, etc., can solve problems such as damage to reservoirs, waste of water resources, incomplete flowback, etc., to reduce damage and speed up flowback , the effect of increasing fracture length and sanding scale

Inactive Publication Date: 2020-08-28
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the water-based fracturing fluid system has a large waste of water resources, clay swelling and fracturing fluid residues damage the reservoir, and incomplete flowback causes groundwater pollution.

Method used

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  • Carbon dioxide energy-enhancing variable displacement mixed injection fracturing method
  • Carbon dioxide energy-enhancing variable displacement mixed injection fracturing method
  • Carbon dioxide energy-enhancing variable displacement mixed injection fracturing method

Examples

Experimental program
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Effect test

Embodiment 1

[0058] Taking a well as an example, the single well gas-bearing area A of this well is 240000m 2 , the effective thickness h of the air layer is 6.2m, the average porosity φ is 6.82%, and the original water saturation S wi is 40%, the original formation pressure P i is 22.6MPa, the air layer temperature T is 363K; the ground temperature T sc is 293K; gas deviation coefficient Z i is 0.93; ground pressure P sc is 0.101MPa; the fracturing fluid sweep coefficient ψ is 1 / 30.

[0059] The fracturing construction is carried out by applying a carbon dioxide variable emission and energy-increasing mixed injection fracturing method of the present invention, and the specific implementation steps are as follows:

[0060] Step 1. Combine single well engineering and geological parameters, combine software simulation to optimize fracturing parameters, and design proppant addition of 30m 3 , construction displacement 4.5m 3 / min, the average sand ratio is 18%, and the pre-fluid ratio i...

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Abstract

A carbon dioxide energy-enhancing variable displacement mixed injection fracturing method comprises the steps: determining fracturing parameters, wherein the fracturing parameters include proppant addition, construction displacement, average sand ratio and prefluid ratio; according to the gas area of a single well, the reservoir geology and engineering parameters, determining the addition amount of carbon dioxide; maintaining the total design and construction displacement unchanged, injecting liquid carbon dioxide according to the addition amount of the carbon dioxide, and injecting fracturingfluid according to the fracturing parameters; and finally, performing fracturing. The method combines the advantages of gas energy-enhanced fracturing and water-based fracturing fluid. Compared withthe prior art, the fracture length and sanding scale are increased, the damage of the fracturing fluid to a reservoir is reduced, and flowback of the fracturing liquid is accelerated.

Description

technical field [0001] The invention relates to the technical field of oil and gas field development, in particular to a carbon dioxide energy-enhancing variable displacement mixed injection fracturing method. Background technique [0002] The physical properties of unconventional reservoirs are generally poor, so it is necessary to use reservoir stimulation technology to improve seepage conditions in order to achieve the purpose of effective production. The most commonly used reservoir stimulation technology at home and abroad is hydraulic fracturing technology, which uses water-based fracturing fluid to stimulate reservoirs. However, the water-based fracturing fluid system has a large waste of water resources, clay swelling and fracturing fluid residues damage the reservoir, and incomplete flowback causes groundwater pollution. [0003] Compared with pure water-based fracturing fluid, carbon dioxide energized fracturing has the following main advantages: on the one hand, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/26E21B43/267G06F30/20
CPCE21B43/164E21B43/26E21B43/267
Inventor 牟春国李宪文张燕明白建文韩巧荣丁勇马新星郝瑞芬叶亮胡阳明
Owner PETROCHINA CO LTD
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