Fracturing recovery fluid gel breaker and preparation method thereof

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

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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  • Fracturing recovery fluid gel breaker and preparation method thereof
  • Fracturing recovery fluid gel breaker and preparation method thereof
  • Fracturing recovery fluid gel breaker and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Accurately weigh raw materials (kg):

[0024] (1) Oxychloride chemical breaker

[0025] Chlorine dioxide 1.5, sodium hypochlorite 4.5 and calcium hypochlorite 4;

[0026] (2) Guarin Glycosidic Bond-Specific Hydrolase 8

[0027] (3) Reductive metal salt initiator

[0028] Ferrous chloride 0.2, ferrous sulfate 0.4 and cuprous chloride 0.4

[0029] (4) Deionized water 90

[0030] Preparation:

[0031] (1) Slowly add 1.5kg of chlorine dioxide, 4.5kg of sodium hypochlorite and 4kg of calcium hypochlorite into 90kg of deionized water, heat while stirring, the stirring rate is 60 rpm, the heating temperature is 30°C, and after constant temperature for 2 hours Raise the temperature to 35°C, keep the temperature for 2 hours, and then cool it down to room temperature naturally to obtain an oxychloride solution;

[0032] (2) Add 8 kg of guar gum glucoside bond-specific hydrolase biological gel breaker into the above-mentioned oxychloride solution, heat while stirring, the st...

Embodiment 2

[0035] Accurately weigh raw materials (kg):

[0036] (1) Oxychloride chemical breaker

[0037] Chlorine dioxide 2, sodium hypochlorite 4 and calcium hypochlorite 5;

[0038] (2) Guarin Glycosidic Bond-Specific Hydrolase 9

[0039] (3) Reductive metal salt initiator

[0040] Ferrous chloride 0.3, ferrous sulfate 0.7 and cuprous chloride 0.5

[0041] (4) Deionized water 95

[0042] Preparation:

[0043] (1) Slowly add 2 kg of chlorine dioxide, 4 kg of sodium hypochlorite and 5 kg of calcium hypochlorite into 95 kg of deionized water, heat while stirring, the stirring rate is 65 rpm, the heating temperature is 31 ° C, and after 2.2 hours of constant temperature, it will naturally Cool to room temperature to obtain oxychloride solution;

[0044] (2) 9 kg of guar gum glucoside bond-specific hydrolase biological gel breaker is added in the above-mentioned oxychloride solution, heated while stirring, the stirring rate is 85 rpm, and the heating temperature is 41 ° C, after 3.5 ...

Embodiment 3

[0047] Accurately weigh raw materials (kg):

[0048] (1) Oxychloride chemical breaker

[0049] Chlorine dioxide2, sodium hypochlorite5 and calcium hypochlorite5;

[0050] (2) Guarin Glycosidic Bond-Specific Hydrolase 10

[0051] (3) Reductive metal salt initiator

[0052] Ferrous chloride 0.4, ferrous sulfate 1.2 and cuprous chloride 0.4

[0053] (4) Deionized water 100

[0054] Preparation:

[0055] (1) Slowly add 2 kg of chlorine dioxide, 5 kg of sodium hypochlorite and 5 kg of calcium hypochlorite into 100 kg of deionized water, heat while stirring, the stirring rate is 70 rpm, the heating temperature is 32 °C, and the temperature rises after 2.5 hours of constant temperature to 38°C, keep the temperature for 2.5 hours, and then naturally cool to room temperature to obtain an oxychloride solution;

[0056](2) Add 10 kg of guar gum glycoside bond-specific hydrolase biogel breaker into the above-mentioned oxychloride solution, heat while stirring, the stirring rate is 9...

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Abstract

The invention relates to the technical field of treatment on oil field fracturing recovery fluid, and in particular relates to a fracturing recovery fluid gel breaker and a preparation method thereof. The gel breaker is prepared from the following components in parts by weight: 10-15 parts of oxygen chloride chemical gel breaker, 8-12 parts of guanidine gum polysaccharide linkage-specific hydrolase biological gel breaker, 1-3 parts of metal salt initiator with reducing agent, and 90-110 parts of deionized water; the oxygen chloride chemical gel breaker is prepared from chlorine dioxide, sodium hypochlorite and calcium hypochlorite in mass proportion of 1: 1-2: 2-3; the metal salt initiator with the reducing agent is prepared from ferrous chloride, ferrous sulfate and cuprous chloride in mass proportion of 1: 2-3: 1-2. The fracturing recovery fluid gel breaker disclosed by the invention is high in gel breaking speed and high in gel breaking water yield, so that the water, petroleum and suspended matters can be easily separated, the treatment effects of subsequent flocculation, sedimentation and filtering processes of the fracturing recovery fluid are improved. Therefore, the gel breaker can be extensively applied to the technical field of gel breaking treatment of the fracturing recovery fluid.

Description

technical field [0001] The invention relates to the technical field of treatment of fracturing flowback fluid, in particular to a gel breaker for fracturing flowback fluid 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 fractur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/66C09K8/68
CPCC09K8/665C09K8/68C09K2208/24C09K2208/26
Inventor 刘琴
Owner YANTAI ZHIBEN INTPROP OPERATIONS MANAGEMENT CO LTD
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