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Cleaning fracturing outlet liquid recovery oil displacement and plugging relief technology

A technology for cleaning fracturing and flowback fluid, which is applied in the direction of production fluid, water/sludge/sewage treatment, drilling composition, etc., and can solve the problem of decreased formation permeability, high water insoluble matter, and poor construction effect, etc. problems, to achieve the effect of preventing scale from re-forming deposits, reducing oil-water interfacial tension, and enhancing the effect of anti-swelling and sand stabilization

Pending Publication Date: 2009-12-23
SUNCOO PETROLEUM TECH
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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
Although foam fracturing overcomes the above shortcomings, its large-scale use is limited due to the high cost of equipment and liquids

Method used

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Embodiment Construction

[0015] For further disclosing the technical scheme of the present invention, describe in detail below:

[0016] A clean fracturing flowback fluid recovery oil displacement and plugging removal process, characterized in that it includes the following steps:

[0017] 1) After the clean fracturing flowback fluid is broken, add flocculants, slime stripping agents or fungicides to deposit and sterilize suspended matter;

[0018] 2) After preliminary filtration and recovery by a well-washing vehicle with filtering function or a precision filter, the suspended matter content of the treated clean fracturing flowback fluid is ≤10mg / l; the oil content is ≤15mg / l;

[0019] 3) According to the injection water quality requirements of each well, it is again finely filtered through a precision filter of 2μm-150μm;

[0020] 4) After fine filtration, add 0.1% (mass percentage) of biological enzyme preparation + water to the filtrate to obtain a composite oil displacement and plugging removal ...

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Abstract

The invention relates to a cleaning fracturing outlet liquid recovery oil displacement and plugging relief technology, comprising the following steps: cracking glue; adding a flocculating agent, an adhesive mud removing agent or a bactericide to accumulate suspended matters and sterilize; filtering and recovering the suspended matters; finely filtering the suspended matters again through a precise filter; and adding a biological enzyme preparation, and the like into the filter liquor. The invention thoroughly solves the problem of the environment pollution of fracturing outlet liquid, can effectively displace the remaining oil of an oil layer, thereby enhancing the recovery ratio of crude oil; and in addition, the invention has environmental-friendly characteristics, can obviously improve the property of rock cores, recovers the percolation rate of a stratum, enhances the water-wet effect and the expand preventing and sand firming effect, prevents incrustations being accumulated again, reduces the oil-water interfacial tension and enhances the recovery ratio of the crude oil.

Description

technical field [0001] The invention relates to a waste liquid chemical recovery process, in particular to a process for recovering oil displacement and plugging removal of clean fracturing flowback liquid. 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 ...

Claims

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Application Information

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IPC IPC(8): E21B43/26C09K8/66C02F9/14C02F3/34C02F1/52C02F1/50
Inventor 盖海防毛美丽张新宇
Owner SUNCOO PETROLEUM TECH
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