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Enzyme-microbe coupled fracturing fluid system and preparation method and applications thereof

A technology for microorganisms and fracturing fluid, applied in the field of water-based fracturing fluid system and its preparation, can solve the problems of affecting fracturing stimulation, large damage to formation original microorganisms, easy formation of filter cakes, etc., so as to improve fracture conductivity, The gel breaking time is controllable and the effect of promoting degradation

Active Publication Date: 2013-10-30
DALIAN BITEOMICS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A variety of chemical additives should be added to the fracturing fluid during construction, which will cause great damage to the original microorganisms in the formation, low bioavailability, and poor gel breaking effect
According to the analysis of 150 hydraulic fracturing operations in the United States, the average flowback rate of the polymer pumped into the fracturing is only 35%-45%. The polymer remaining in the bottom layer is easy to form a filter cake, block the pore throat, and damage the formation. cause some damages
This kind of damage is difficult to remove. In case of water-sensitive formation, dead pressure will be formed, which seriously affects the effect of fracturing and increasing production.

Method used

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  • Enzyme-microbe coupled fracturing fluid system and preparation method and applications thereof
  • Enzyme-microbe coupled fracturing fluid system and preparation method and applications thereof
  • Enzyme-microbe coupled fracturing fluid system and preparation method and applications thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A new water-based fracturing fluid for oil and gas extraction was created by:

[0031] 1) Weigh 0.45 g of vegetable gum polymer according to the weight ratio, and add it into 100 mL of water at a uniform speed under the condition of high-speed stirring to prepare guar gum base liquid.

[0032] 2) Add 0.02g of biological fungicide, 0.025g of biological drainage aid, 0.05g of preflush biooptimizer, 0.1g of microbial enhanced production increase agent, 2g of clay stabilizer, and 30mg / L of biological enzyme gel breaker.

[0033] 3) Adding a pH regulator to adjust the pH value to 8.5-9.5.

[0034] 4) Adding a cross-linking agent for cross-linking, the cross-linking agent is 1.5wt% borax aqueous solution, the addition amount is 5mL, and stirring gently at the same time, the jelly for fracturing can be obtained.

[0035] A preparation method of a pre-fluid bio-optimizer, whose function is to activate the original microorganisms of the oil well and provide a nutrient source fo...

Embodiment 2

[0047] Reagent preparation is as described in embodiment 1, construction scheme:

[0048] 1. Configure guar gum base liquid 40m according to the above formula 3

[0049] 2. Mix the sand in the sand mixer, and slowly add the gel breaker at the same time, the dosage is about 2kg / well. After cross-linking, pump it into the well with a pump truck.

[0050] 3. The flowback of the gel breaking fluid is delayed for 2-3 hours, and the construction results are as follows:

[0051]

[0052] According to the above experimental data, the daily oil production of wells adopting the enzyme-microbial coupling fracturing system of the present invention is significantly increased in the case of delayed flowback after gel breaking. It can be seen that the use scheme of this invention can increase the oil production by half .

Embodiment 3

[0054] To reduce the amount of residue, use a core permeability tester, a core porosity tester, a core vacuum pressure saturation device, etc. to do the following tests. Reagent preparation is as described in embodiment 1, selects three rock cores of the same formation, and the initial data of rock cores are as follows:

[0055] Core physical parameter table

[0056]

[0057] The gel-breaking fluid that passes through the 1# core uses ammonium persulfate as the gel-breaking agent, the gel-breaking fluid that passes through the 2# core uses only biological enzymes as the gel-breaking agent, and the gel-breaking fluid that passes through the 3# core uses an enzyme-microbial couple The joint system is a gel breaker. The core damage is determined by instrumentation. The experimental procedure is as follows:

[0058] 1. The core is injected with kerosene until saturated. Inlet pressure is maintained at About 20MPa , the outlet pressure is maintained at About 0.2MPa . De...

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Abstract

The invention relates to a fracturing fluid system, in particular to a new aqueous fracturing enzyme-microbe coupled fracturing fluid system used in the petroleum and natural gas exploitation, wherein the chemical additives in the original aqueous fracturing fluid are replaced by the biological additives with the same function, and inoculating microbe degrading residue and gel are added to react so as to greatly increase the gel-breaking efficiency and reduce formation damage. The fracturing fluid system comprises the following components: 0.30-0.55wt% of vegetable gum polymer, 0.002-0.2wt% of biological bactericide, 0.025-0.05wt% of biological cleanup additive, 0.05-0.1wt% of ahead fluid biological optimizer, 0.05-0.1wt% of microbial enhanced production-increasing agent, 1-3wt% of clay stabilizer, pH regulator, 10-30mg / L of enzyme breaker and the balance water. The fracturing fluid system of the invention uses non-toxic and harmless natural products to the maximum to replace toxic and harmful chemical additives, achieves the aims of degradable working fluid creatures which are injected in the formation, energy conservation and emission reduction and environmental protection and is an ideal fracturing fluid system.

Description

technical field [0001] The invention relates to a biological fracturing fluid system, in particular to a novel oilfield plant glue water-based fracturing fluid system which is green, environmentally friendly and biomass can be utilized and the preparation thereof. Background technique [0002] Oilfield hydraulic fracturing is one of the operations that causes a lot of chemical contamination of formations and polymer damage. A variety of chemical additives should be added to the fracturing fluid during construction, which will cause great damage to the original microorganisms in the formation, low bioavailability, and poor gel breaking effect. According to the analysis of 150 hydraulic fracturing operations in the United States, the average flowback rate of the polymer pumped into the fracturing is only 35%-45%. The polymer remaining in the bottom layer is easy to form a filter cake, block the pore throat, and damage the formation. cause some damages. This kind of damage is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/68E21B43/26
Inventor 梅晓丹刘滢赵静王平陈琛付步飞杨平杜国丰刘文静刘润海
Owner DALIAN BITEOMICS INC
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