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Combined-type fracturing fluid bio-enzyme gel breaker and application method thereof

A technology of fracturing fluid and gel breaker, which is applied in drilling compositions, chemical instruments and methods, earthwork drilling and mining, etc. It can solve problems such as incomplete gel breaking, reduction of fracturing fluid residue, and short action time

Active Publication Date: 2014-07-09
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the above-mentioned problems in the prior art, the present invention is committed to providing a combined fracturing fluid biological enzyme gel breaker and its use method, which can effectively solve the above-mentioned gel breaking problems in the fracturing construction of medium and low temperature reservoirs. Incomplete and short-acting effects, to achieve the purpose of uniform and thorough fracturing fluid gel breaking, long-term effect and reducing fracturing fluid residue

Method used

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  • Combined-type fracturing fluid bio-enzyme gel breaker and application method thereof
  • Combined-type fracturing fluid bio-enzyme gel breaker and application method thereof
  • Combined-type fracturing fluid bio-enzyme gel breaker and application method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] Biological enzyme gel breaker suitable for borax cross-linked hydroxypropyl guar gum system

[0069] Breaker:

[0070] Liquid compound enzyme A: by volume percentage, the liquid compound enzyme A contains 20% alkaline galactomannan enzyme liquid, 0.50% cellulase liquid, 0.50% protease liquid, and 79% water.

[0071] Borax cross-linked hydroxypropyl guar gum HPG fracturing fluid base fluid:

[0072] Prepare borax crosslinked hydroxypropyl guar gum HPG fracturing fluid base fluid according to the following formula: hydroxypropyl guar gum powder HPG0.3wt%, formaldehyde 0.1wt%, citric acid 0.02wt%, sodium bicarbonate 0.05wt%, sodium carbonate 0.05wt%, polyoxyethylene polyoxypropylene pentaethylene hexamine AE10100.1wt%, potassium chloride 2.0wt%, the balance is water, pH8.0, the addition of borax crosslinking agent is 0.05wt%.

[0073] Add the liquid compound enzyme A to the borax cross-linked hydroxypropyl guar gum HPG fracturing liquid base fluid, mix well, and set asi...

Embodiment 2

[0077] Biological enzyme gel breaker for metal cation cross-linked carboxymethyl hydroxypropyl guar gum system

[0078] Breaker:

[0079] Liquid compound enzyme A: by volume, it contains 18% of acidic galactomannan enzyme solution, 1.0% of cellulase solution, 1.0% of protease solution and 80% of water.

[0080] Aluminum ion cross-linked carboxymethyl hydroxypropyl guar gum CMHPG fracturing fluid base fluid:

[0081] Prepare aluminum ion cross-linked carboxymethyl hydroxypropyl guar gum CMHPG fracturing fluid base fluid according to the following formula: carboxymethyl hydroxypropyl guar gum powder CMHPG0.3wt%, formaldehyde 0.1wt%, citric acid 0.02wt%, bicarbonate Sodium 0.05wt%, sodium alkylsulfonate 0.2wt%, polyoxyethylene octylphenol ether 10OP-100.1wt%, the balance is water, pH5.5, crosslinking agent aluminum potassium sulfate 0.5wt%;

[0082] Add the liquid compound enzyme A to the aluminum ion cross-linked carboxymethyl hydroxypropyl guar gum CMHPG fracturing fluid ba...

Embodiment 3

[0090] Breaker:

[0091] Liquid compound enzyme A: by volume, it contains 20% alkaline galactomannan enzyme solution, 1% cellulase solution, 1% protease solution, and 78% water.

[0092] Alkaline Galactomannan Enzyme Solution.

[0093] Borax cross-linked hydroxypropyl guar gum HPG fracturing fluid base fluid:

[0094] The borax cross-linked hydroxypropyl guar gum HPG fracturing fluid base fluid was prepared according to the formula in Example 1.

[0095] The alkaline galactomannan enzyme liquid and the liquid compound enzyme A were used as a gel breaker to carry out a gel breaking experiment respectively. The gel breaking test method is "SYT6380-2008 Gel Breaker Performance Test Method for Fracturing", and the experimental temperature Both are 60°C;

[0096] Wherein, the addition is in volume ratio, the addition of the alkaline galactomannan enzyme liquid is 0.002% of the volume of the borax cross-linked hydroxypropyl guar gum HPG fracturing fluid base fluid, and the liquid...

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Abstract

The invention provides a combined-type fracturing fluid bio-enzyme gel breaker and an application method thereof, and the combined-type fracturing fluid bio-enzyme gel breaker comprises a slow-release compound enzyme B and / or a liquid compound enzyme A; the slow-release compound enzyme B is prepared from a slow releasing material B2 and a compound enzyme solution B1 by granulation, the slow releasing material B2 and the compound enzyme solution B1 respectively account for 70-80wt% and 20-30wt% of the total weight of granulation materials; the compound enzyme solution B1 in the slow-release compound enzyme B comprise, by volume, 70%-80% of a galactomannan enzyme liquid, 10%-15% of a cellulase liquid and 10%-15% of a protease liquid; the liquid compound enzyme A comprise, by volume, 5%-20% of the galactomannan enzyme liquid, 0.10%-5.0% of the cellulase liquid, 0.10%-5.0% of the protease liquid and 70-90% of water. According to the combined-type fracturing fluid bio-enzyme gel breaker and the application method thereof, efficient gel breaking of a middle and low temperature oil deposit fracturing fluid can be realized, the gel breaking is long in aging, fracturing residues can be reduced, and damages of the fracturing fluid to stratum can be reduced.

Description

technical field [0001] The invention relates to a fracturing fluid biological enzyme gel breaker in the field of oil field drilling, and furthermore relates to a combined fracturing fluid biological enzyme gel breaker and a use method thereof. Background technique [0002] Water-based fracturing technology is one of the important means to increase the production of oil and gas wells. With the decline of oil and gas resources in the world, the petroleum industry has shifted from traditional energy to the exploration and development of unconventional resources. Low permeability oil and gas, super heavy oil, shale gas The development of water-based fracturing technology is in urgent need of application. [0003] Thickener is the main additive in water-based fracturing fluid, and its performance has an important impact on the overall performance of fracturing fluid and the effect of fracturing operation. There are many kinds of water-based fracturing fluid thickeners used on sit...

Claims

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Application Information

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IPC IPC(8): C09K8/80E21B43/267
CPCC09K8/66C09K8/665C09K8/685C09K8/885C09K8/887C09K8/90C09K2208/24E21B43/267
Inventor 郑承纲李宗田梁涛刘传喜刘长印赵梦云黄志文孙志宇林鑫贺甲元杨科峰
Owner CHINA PETROLEUM & CHEM CORP
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