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Composite gel breaker preparation method

A technology of gel breaker and preparation steps, which is applied in the field of preparation of composite gel breaker, which can solve the problems of great influence on the crack conduction capacity of macromolecular substances, reduce the molecular weight of gel breaker products, and incomplete gel breaker, etc., and achieve cheap raw materials , easy to flow back, and complete gel breaking effect

Inactive Publication Date: 2017-03-15
CHANGZHOU DINGRI ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention: the commonly used gel breaker is ammonium persulfate. Although it is cheap and easy to use, it has chemical pollution, incomplete gel breaking, difficult flowback and macromolecular substances that cause cracks to crack after gel breaking. In order to solve the problem that the flow capacity is greatly affected, a method for preparing a gel breaker with a biological enzyme compound oxidant is provided. The invention mixes the processed and broken coral with various nutrients to obtain fermented nutrients, puts them into a fermenter and adds Bacillus subtilis is fermented, the supernatant obtained by centrifugation of the fermented liquid is collected, the tortoise shell is mixed with an oxidizing agent, etc. to obtain a gel breaker mixed base liquid, and mixed with an auxiliary agent to obtain a composite gel breaker. The preparation process of the present invention is simple, The cost is low, and the enzyme gel breaker obtained by using the abundant high-activity enzymes in corals, Bacillus subtilis and oxidants not only breaks the gel thoroughly during construction, greatly reduces the molecular weight of the gel-breaking product, is easy to flow back, and has a small amount of residue. As a nutrient, it can sustainably maintain the activity of microorganisms, is easy to biodegrade, and will not pollute the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0017] First take 1kg of coral and clean it with deionized water, then add it to the container, then add 600mL of 5% hydrogen peroxide solution, heat the container to 40°C, soak for 1 hour, stop heating, and take out the coral. Put it in a ventilated place to dry naturally for 5 hours, put the dried coral into a pulverizer and crush it for 30 minutes, collect the broken coral, and set aside; weigh 10g glucose, 5g peptone, 0.8g sodium chloride, 0.3g dipotassium hydrogen sulfate and 5g of peanut powder were added to a beaker, stirred and mixed for 1min, placed in a sterilized tank, and sterilized at 95°C for 5min, after the sterilization was completed, the temperature was naturally lowered to 30°C to obtain fermented nutrients; the above fermented nutrient The material and 20g of spare broken coral were added to the fermenter, and Bacillus subtilis was inoculated into the fermenter according to the inoculation amount of 8%, and it was aerobically fermented at 30°C for 3 days. Aft...

example 2

[0020] First take 1kg of coral and clean it with deionized water, then add it to the container, then add 650mL of 5% hydrogen peroxide solution, heat the container to 45°C, soak for 1 hour, stop heating, and take out the coral. Put it in a ventilated place to dry naturally for 5 hours, put the dried coral into a pulverizer and crush it for 35 minutes, collect the broken coral, and set aside; weigh 15g glucose, 6g peptone, 0.9g sodium chloride, 0.4g dipotassium hydrogen sulfate and 6g of peanut powder were added to a beaker, stirred and mixed for 2 minutes, placed in a sterilized tank, and sterilized at 100°C for 8 minutes. After the sterilization was completed, the temperature was naturally lowered to 35°C to obtain fermented nutrients; The material and 25g of spare broken corals were added to the fermenter, and then Bacillus subtilis was inoculated into the fermenter according to the inoculation amount of 9%, and aerobic fermentation was carried out at 35°C for 3 days. After t...

example 3

[0023]First take 2kg of coral and clean it with deionized water, then add it to the container, then add 700mL of 5% hydrogen peroxide solution, heat the container to 50°C, soak for 2 hours, stop heating, and take out the coral. Put it in a ventilated place to dry naturally for 6 hours, put the dried coral into a grinder and crush it for 40 minutes, collect the crushed coral, and set aside; weigh 20g glucose, 8g peptone, 1.0g sodium chloride, 0.5g dipotassium hydrogen sulfate and 8g of peanut powder were added to a beaker, stirred and mixed for 3 minutes, placed in a sterilization tank, and sterilized at 105°C for 10 minutes. After the sterilization was completed, the temperature was naturally lowered to 40°C to obtain fermented nutrients; Add the material and 30g of spare broken coral into the fermenter, then inoculate Bacillus subtilis into the fermenter according to 10% inoculation amount, and ferment aerobically at 40°C for one day. After the fermentation is over, collect th...

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PUM

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Abstract

The invention relates to a composite gel breaker preparation method, and belongs to the technical field of gel breaker preparation. Treated and crushed corals are mixed with various nutrients to obtain fermented nutrients, the fermented nutrients are placed into a fermentation tank, bacillus subtilis is added into the fermentation tank to perform fermentation, supernate obtained by centrifugally separating fermentation liquor is collected, a turtle shell is mixed with oxidizing agents and the like to obtain gel breaker mixed base solution, and the gel breaker mixed base solution is mixed with auxiliaries to obtain a composite gel breaker. The preparation process is simple and low in cost, the enzyme gel breaker is obtained by the aid of rich high-activity enzyme in the corals, the bacillus subtilis and oxidizing agents, gel breaking is thorough in construction, the molecular weight of gel breaking products is greatly reduced, back-displacement is easily realized, residue quantity is small, the gel breaker can serve as a nutrient, activity of microorganisms can be continuously kept, biodegradation is easily realized, and environments cannot be polluted.

Description

technical field [0001] The invention relates to a preparation method of a composite breaker, belonging to the technical field of breaker preparation. Background technique [0002] At present, in the process of oil recovery in oil fields, it is necessary to add thickener solution and cross-linking agent to cross-link into high-viscosity jelly fracturing fluid, which is injected into the formation. The higher the viscosity of the fracturing fluid, the stronger the sand-carrying performance and the higher the success rate of construction. high. However, after the construction is completed, the high-viscosity fracturing fluid must be completely broken and flowed back as soon as possible to reduce damage to the reservoir. The thickeners used in fracturing fluids are mainly galactomannan plant gums and their modified derivatives, which can thicken, transport proppant, suspend, control fluid loss and isolate layers properties, which tend to cause polymer damage if not degraded ef...

Claims

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Application Information

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IPC IPC(8): C09K8/68
CPCC09K8/68C09K2208/24
Inventor 周丽花孟中立
Owner CHANGZHOU DINGRI ENVIRONMENTAL PROTECTION TECH