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Compound gel breaker and preparing method thereof

A technology of gel breaker and biological gel breaker, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of slow gel breaking speed, failure to achieve fast gel breaking, and reduce gel breaking residue, etc., to achieve Fast gel breaking speed, easy separation, and high water yield from gel breaking

Inactive Publication Date: 2017-01-11
YANTAI ZHIBEN INTPROP OPERATIONS MANAGEMENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The higher the temperature, the stronger the reactivity of the oxidant, but when the temperature is lower than 50°C, the gel-breaking effect of the oxidant decreases significantly
Biological enzyme gel breaker is a green and environment-friendly gel breaker, which can significantly improve the reduction of gel-breaking residues, but the gel-breaking speed is slow, the gel-breaking is not complete, and it cannot meet the requirements of rapid gel-breaking

Method used

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  • Compound gel breaker and preparing method thereof
  • Compound gel breaker and preparing method thereof
  • Compound gel breaker and preparing method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Accurately weigh raw materials (kg):

[0024] (1) persulfide chemical breaker

[0025] Ammonium persulfate 2, potassium persulfate 4 and sodium ammonium persulfate 4;

[0026] (2) Cellulose glycoside bond-specific hydrolase 6

[0027] (3) Polyol compound initiator

[0028] Diethanolamine 0.2, Triethanolamine 0.6 and Methyldiethanolamine 0.2

[0029] (4) Deionized water 80

[0030] Preparation:

[0031] (1) Slowly add 2 kg of ammonium persulfate, 4 kg of potassium persulfate and 4 kg of sodium ammonium persulfate into 80 kg of deionized water, and heat while stirring. Raise the temperature to 35°C, keep the temperature for 2 hours, and then cool it down to room temperature naturally to obtain a persulfide solution;

[0032] (2) Add 6 kg of cellulose glucoside bond-specific hydrolase biological gel breaker into the above persulfide solution, heat while stirring, the stirring rate is 80 rpm, the heating temperature is 40 ° C, keep the temperature for 3 hours and then...

Embodiment 2

[0035] Accurately weigh raw materials (kg):

[0036] (1) persulfide chemical breaker

[0037] Ammonium persulfate 2, potassium persulfate 5 and sodium ammonium persulfate 4;

[0038] (2) Cellulose glycoside bond-specific hydrolase 7

[0039] (3) Polyol compound initiator

[0040] Diethanolamine 0.3, Triethanolamine 0.6 and Methyldiethanolamine 0.6

[0041] (4) Deionized water 85

[0042] Preparation:

[0043] (1) Slowly add 2 kg of ammonium persulfate, 5 kg of potassium persulfate and 4 kg of sodium ammonium persulfate into 85 kg of deionized water, and heat while stirring. Naturally cool to room temperature afterward, obtain persulfide solution;

[0044] (2) Add 7 kg of cellulose glycoside bond-specific hydrolase biogel breaker into the above-mentioned persulfide solution, heat while stirring, the stirring rate is 85 rpm, the heating temperature is 41 ° C, and after 3.5 hours at constant temperature, it will naturally Cool to room temperature, after cooling at room tem...

Embodiment 3

[0047] Accurately weigh raw materials (kg):

[0048] (1) persulfide chemical breaker

[0049] Ammonium persulfate 2, potassium persulfate 4 and sodium ammonium persulfate 6;

[0050] (2) Cellulose glycoside bond-specific hydrolase 8

[0051] (3) Polyol compound initiator

[0052] Diethanolamine 0.5, Triethanolamine 1.0 and Methyldiethanolamine 0.5

[0053] (4) Deionized water 90

[0054] Preparation:

[0055] (1) Slowly add 2kg of ammonium persulfate, 4kg of potassium persulfate and 6kg of sodium ammonium persulfate into 90kg of deionized water, heat while stirring, the stirring rate is 70 rpm, the heating temperature is 32°C, and the temperature is kept for 2.5h Then heat up to 38°C, keep the temperature for 2.5h, then cool down to room temperature naturally to obtain a persulfide solution;

[0056](2) Add 8 kg of cellulose glucoside bond-specific hydrolase biological gel breaker into the above-mentioned persulfide solution, heat while stirring, the stirring rate is 90 ...

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Abstract

The invention relates to processing technology field on oil field fracturing return liquid, particularly relates to a compound gel breaker and preparing method thereof. The composite gel breaker consists of, by weight, the following components: 10-15 parts of persulfide chemical gel breaker, 6-10 parts of cellulose glycoside bond specific hydrolase biological gel breaker, 1-3 parts of polyol compound initiator, 80-100 parts of deionized water. The persulfide chemical gel breaker consists of ammonium persulfate, potassium persulfate and ammonium sodium sulfate, the quality ratio is 1:2 - 3:2 - 3; polyol compound initiator comprises diethanolamine, triethanolamine and methyl diethanolamine, the quality ratio is 1:2 - 3:1 - 2. The invention has the advantages of high gel breaking speed and high gel breaking water yield, letting the water, oil and suspended substance easy to be separated, and improves the treatment effect of the subsequent flocculation, sedimentation and filtration process for fracturing return liquid. Therefore, the invention can be widely applied in the technical field of the fracturing return liquid gel breaking treatment.

Description

technical field [0001] The invention relates to the technical field of treatment of oilfield fracturing flowback fluid, in particular to a composite gel breaker and a preparation method thereof. [0002] technical background [0003] Fracturing is one of the main measures to increase production of oil and gas wells. During the fracturing construction process, the high-viscosity fracturing fluid is injected into the formation by the high-pressure pump set, and the fracture is carried in with the proppant. The completely broken fracturing fluid and the remaining original gel fluid (base fluid) are returned from the wellbore to the surface. The composition of this part of the flowback fluid is complex. Due to the broken and unbroken guar gum / jelly, high molecular polymers, petroleum, iron ions, etc., the flowback fluid has high viscosity and serious emulsification, which affects the pressure. The diffusion of chemicals during flocculation and sedimentation of fracturing flowbac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/66C09K8/86C09K8/90
CPCC09K8/665C09K8/86C09K8/905C09K2208/24
Inventor 刘琴
Owner YANTAI ZHIBEN INTPROP OPERATIONS MANAGEMENT CO LTD