Bio-enzyme fracturing outlet liquid recovering, oil-displacing and de-plugging process

A fracturing flowback fluid and biological enzyme technology, which is applied in the multi-stage treatment of water/sewage, production fluid, wellbore/well components, etc., can solve the problems of little effect, decreased formation permeability, poor construction effect, etc.

Inactive Publication Date: 2010-02-03
DONGYING SHENGSHI PETROLEUM TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high molecular weight of the polymer and the large amount of water-insoluble matter, it is cross-linked with a cross-linking agent to form a supermacromolecule. The completely broken supermacromolecules stay in the cracks, which reduces the permeability of the formation and the construction effect is not good
In addition, in the whole fracturing process, there are many kinds of fracturing fluid admixtures, thickeners have slow dispersion and swelling speed, etc., which seriously affect the quality of fracturing fluid.
People have recognized this hazard, and made great improvements in the gel breaking system and additives, but there is still little effect on reducing residues and improving fracturing quality

Method used

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Embodiment Construction

[0017] For further disclosing the technical scheme of the present invention, the best solution is described in detail below:

[0018] A bioenzyme fracturing flowback fluid recovery oil displacement and plugging removal process, which comprises the following steps:

[0019] 1) After adding SUN-Y100 bio-enzyme gel breaker to the fracturing flowback fluid, add 15ppm flocculant and 80ppm slime stripping agent to deposit suspended matter;

[0020] 2) The fracturing flowback fluid after deposition is initially filtered and recovered by a well-washing truck with filtering function. After treatment, the content of suspended solids is ≤10mg / l, and the oil content is ≤15mg / l;

[0021] 3) The recovered fracturing flowback fluid is finely filtered through a precision filter of 2 μm as required;

[0022] 4) After fine filtration, add or compound chemical agents, add 0.2% (mass percentage) of biological enzyme preparations, 0.05% (mass percentage) of additives and 10.05% (mass percentage) ...

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Abstract

The invention relates to a bio-enzyme fracturing outlet liquid recovering, oil-displacing and de-plugging process. The process comprises the following steps: 1) after performing gel breakage on fracturing outlet liquid by adding SUN-Y100 bio-enzyme gel breaker, adding 10-100 ppm of flocculant, 10-100 ppm of slime stripping agent and 0-20 ppm of fungicide for suspended matter precipitation and sterilization; 2) primarily filtering and recovering by a well cleanout track with a filtration function, wherein the content of the treated suspended matter is equal to or less than 10 mg / l and oil content is equal to or less than 15 mg / l; 3) precisely 2-150-micron-filtering by a precise filter again; and 4) after the fine filtration, adding 0.1-0.3 percent by mass of bio-enzyme preparation, 0-1.1percent by mass of other additives and 0-50 percent by mass of water., The fracturing outlet liquid can not be discharged back after being filled into an oil water well, thereby thoroughly solving theproblem of environment pollution, increasing the crude oil extraction rate by over 6-18 percent, preventing the dirt re-precipitation and reducing the tensile force of an oil water interface.

Description

technical field [0001] The invention relates to a waste liquid chemical recovery process, in particular to a bio-enzyme fracturing flowback liquid recovery oil displacement and block removal process. Background technique [0002] With the continuous development of hydraulic fracturing, various sand-carrying fluids have emerged. In water-based, emulsified and foam fracturing operations, the most used fracturing fluid is water-based gel fracturing fluid, in which thickeners are some high molecular polymers, such as boron cross-linked guar gum, hydroxypropyl fracturing fluid, etc. Base cellulose, polyacrylamide, etc. These polymers can basically meet the requirements for liquids in current on-site construction. However, due to the high molecular weight of the polymer and the large amount of water-insoluble matter, it is cross-linked with a cross-linking agent to form a supermacromolecule. The completely broken supermacromolecules stay in the cracks, which reduces the permeab...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/26E21B43/22C02F9/04
Inventor 盖海防毛美丽张新宇
Owner DONGYING SHENGSHI PETROLEUM TECH CO LTD
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