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Crosslinker for recoverable polymer fracturing fluid, and preparation method and application thereof

A technology of cross-linking agent and fracturing fluid, which is applied in the field of fracturing fluid, can solve the problems that restrict the development of seepage oil and gas fields, and cannot be effectively treated and utilized, and achieve the effects of shortening the water preparation cycle, solving difficult treatment, and saving fresh water resources

Inactive Publication Date: 2018-05-29
CNPC SICHUAN GASOLINEEUM GEOPHYSICAL PROSPECTING ENG TECH RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In recent years, with the continuous development of tight oil and gas, shale gas and other tight reservoirs, large-scale fracturing and stimulation operations have provided strong technical support for the development of low-permeability oil and gas fields, greatly improving the productivity of oil and gas wells, but At the same time, large-scale fracturing operations have produced a large amount of flowback liquid sewage, which cannot be effectively treated and utilized
Due to the shortage of fresh water resources and environmental protection near oil and gas fields, the disadvantages of fracturing fluid flowback waste liquid treatment methods have become increasingly prominent, which seriously restricts the development of permeable oil and gas fields.

Method used

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  • Crosslinker for recoverable polymer fracturing fluid, and preparation method and application thereof
  • Crosslinker for recoverable polymer fracturing fluid, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] This embodiment provides a recyclable polymer cross-linking agent for fracturing fluid. The cross-linking agent can be re-cross-linked with the gel breaking fluid through a complexation reaction to form a fracturing fluid.

[0029] The crosslinking agent includes the following components: by mass percentage, 3%-8% high-valent metal salt, 12%-18% polyol, 0.5%-2% regulator, 2%-6% surfactant, 1%-2% anticoagulant and 64%-81.5% distilled water.

[0030] The high-valent metal salt is one or more of zirconium oxychloride, polyaluminum chloride, and aluminum trichloride.

[0031] The polyhydroxy compound is one or more of glycerol, mannitol and ethylene glycol.

[0032] The regulator is one of formic acid, acetic acid and lactic acid.

[0033] The surfactant is C 16 -C 22 Long chain alkyl polyoxyethylene ether.

[0034] The anticoagulant is one or both of sodium citrate and potassium citrate.

[0035] The cross-linking agent for the recyclable polymer fracturing fluid pro...

Embodiment 2

[0037] This embodiment provides a method for preparing a cross-linking agent for recyclable polymer fracturing fluid, which is characterized in that it includes the following steps:

[0038] Step 1. Add 3%-8% high-valent metal salt to 64%-81.5% distilled water and stir until completely dissolved;

[0039] Step 2, add 12%-18% polyol, heat the system to 60°C, and react for 4 hours;

[0040] Step 3, then add 0.5%-2% regulator, 2%-6% surfactant, and 1%-2% anticoagulant in sequence;

[0041] Step 4: Stop heating and continue stirring for 0.5 hour to obtain a cross-linking agent for recyclable polymer fracturing fluid.

[0042] Further, the stirring rate in the step 1 is 100 rpm.

Embodiment 3

[0044] This embodiment provides an application method of a recyclable polymer fracturing fluid cross-linking agent, and the steps of using the cross-linking agent to prepare the fracturing fluid are as follows:

[0045] Step 1. Prepare the following components: by mass percentage, 0.35%-0.45% thickener, 0.3%-0.5% drainage aid, 0.3%-0.5% clay stabilizer, 0.004%-0.01% ammonium persulfate, 0.3 %-0.5% cross-linking agent, the balance is clear water or flowback fluid of polymer fracturing fluid;

[0046] Step 2. Add 0.35%-0.45% thickener to the flowback fluid of clean water or polymer fracturing fluid, stir evenly, then add 0.3%-0.5% clay stabilizer, 0.3%-0.5% drainage aid, 0.004% -0.01% ammonium persulfate, and finally add 0.3%-0.5% cross-linking agent to form fracturing fluid. The fracturing fluid is well cross-linked and can be completely suspended.

[0047] Preferably, the fracturing fluid is composed of the following mass percentages: 0.4% thickener, 0.3% drainage aid, 0.3% c...

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Abstract

The invention provides a crosslinker for a recoverable polymer fracturing fluid, and a preparation method and an application thereof. The crosslinker can be re-crosslinked with polymer molecules in agel breaking fluid to form a fracturing fluid by a complexing reaction. The crosslinker includes the following components by the mass percentage: 3%-8% of a high-valence metal salt, 12%-18% of a polyhydroxy compound, 0.5%-2% of a regulator, 2%-6% of a surfactant, 1%-2% of an anticoagulant and 64%-81.5% of distilled water. The crosslinker can be re-crosslinked with the polymer molecules in the gelbreaking fluid by the high-strength complexing reaction to form the fracturing fluid, the crosslinking property is not affected by substances such as crude oil, metal ions, mechanical impurities and the like in a flowback liquid, the problem of treatment of a backflow fracturing fluid can be effectively solved, the fresh water resources for fracturing is saved, the water preparation period is shortened, and the construction efficiency is improved.

Description

technical field [0001] The invention relates to the field of fracturing fluid technology, in particular to a crosslinking agent for recyclable polymer fracturing fluid and its preparation method and application. Background technique [0002] In recent years, with the continuous development of tight oil and gas, shale gas and other tight reservoirs, large-scale fracturing and stimulation operations have provided strong technical support for the development of low-permeability oil and gas fields, greatly improving the productivity of oil and gas wells, but At the same time, large-scale fracturing operations have produced a large amount of flowback liquid sewage, which cannot be effectively treated and utilized. Due to the increasing shortage of fresh water resources and environmental protection near oil and gas fields, the disadvantages of fracturing fluid flowback waste liquid treatment methods have become increasingly prominent, which seriously restricts the development of p...

Claims

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Application Information

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IPC IPC(8): C09K8/68C09K8/66C09K8/60
CPCC09K8/604C09K8/665C09K8/685C09K2208/12C09K2208/26
Inventor 王所良吴增智汪小宇李勇樊庆缘宋振云许伟星杨发金娜黄永章陈迎花荆建春唐冬珠黄超万向辉苏伟东武月荣李雪
Owner CNPC SICHUAN GASOLINEEUM GEOPHYSICAL PROSPECTING ENG TECH RES INST
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