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Biological enzyme fracturing technology for oil fields and oil wells

A biological enzyme and fracturing technology, applied in wellbore/well components, production fluids, earth-moving drilling, etc., can solve problems such as cold damage and water damage, and achieve the effects of strong compatibility, improved efficiency and high cost performance.

Inactive Publication Date: 2012-03-21
XI'AN PETROLEUM UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the above-mentioned shortcomings of the prior art, the object of the present invention is to provide a biological enzyme fracturing process for oil wells, which solves the problems of cold damage, water damage and residue damage, and has good environmental protection effect, wide application range, The advantages of strong compatibility, thorough glue breaking, simple operation and high cost performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A biological enzyme fracturing process for oil wells in oil fields, comprising the following steps:

[0037] The first step is to connect the ground pipeline and test the pressure of the high-pressure pipeline: the pressure reaches 50Mpa, no leakage,

[0038] In the second step, take 1.0m 3 / min displacement backwash well, cycle for more than two weeks,

[0039] The third step is to start pump fracturing and wait for the broken pressure display, and start filling after the pressure is stable. The filling sequence is:

[0040] First inject the pre-fluid, the pre-fluid is hot water solution of SUN-B2 bio-enzyme plugging remover with a mass concentration of 0.4%, the temperature is 70°C, and the amount of pre-fluid is 20m 3 ;

[0041] Then inject base liquid, add cross-linking agent and proppant while injecting base liquid, base liquid is by mass concentration 0.3% hydroxypropyl guar gum and mass concentration 0.4% SUN-B2 bio-enzyme unblocking agent solution according t...

Embodiment 2

[0047] A biological enzyme fracturing process for oil wells in oil fields, comprising the following steps:

[0048] The first step is to connect the ground pipeline and test the pressure of the high-pressure pipeline: the pressure reaches 50Mpa, no leakage,

[0049] In the second step, take 1.0m 3 / min displacement backwash well, cycle for more than two weeks,

[0050] The third step is to start pump fracturing and wait for the broken pressure display, and start filling after the pressure is stable. The filling sequence is:

[0051] First inject the pre-fluid, the pre-fluid is a hot water solution of SUN-B2 bio-enzyme unblocking agent with a mass concentration of 0.5%, the temperature is 80°C, and the pre-fluid dosage is 20m 3 ;

[0052] Then inject base liquid, add cross-linking agent and proppant while injecting base liquid, base liquid is by mass concentration 0.4% hydroxypropyl guar gum and mass concentration 0.5% SUN-B2 bio-enzyme unblocking agent solution according to...

Embodiment 3

[0058] A biological enzyme fracturing process for oil wells in oil fields, comprising the following steps:

[0059] The first step is to connect the ground pipeline and test the pressure of the high-pressure pipeline: the pressure reaches 50Mpa, no leakage,

[0060] In the second step, take 1.0m 3 / min displacement backwash well, cycle for more than two weeks,

[0061] The third step is to start pump fracturing until there is a broken pressure display, and start filling after the pressure is stable. The filling sequence is:

[0062]First inject the pre-fluid, the pre-fluid is hot water solution of SUN-B2 bio-enzyme unblocking agent with a mass concentration of 0.6%, the temperature is 90°C, and the pre-fluid dosage is 20m 3 ;

[0063] Then inject base liquid, add cross-linking agent and proppant while injecting base liquid, base liquid is by mass concentration 0.5% hydroxypropyl guar gum and mass concentration 0.6% SUN-B2 bio-enzyme unblocking agent solution according to ma...

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PUM

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Abstract

The invention discloses a biological enzyme fracturing technology for oil fields and oil wells. The technology comprises the following steps of: connecting a ground pipeline, testing the pressure of a high-pressure pipeline, backwashing a well, starting a pump for fracturing till a fracturing pressure is displayed, and starting injection after the pressure is stable, wherein the injection has the sequence of: injecting an ahead fluid, injecting a base fluid, adding a cross-linking agent and a propping agent at the same time of injecting the base fluid, injecting a gel breaker, closing the mounting wellhead to build the pressure, controlling blow-out of a pressure oil pipe, and pulling out a shaft pipe column after the pressure of the wellhead is dispersed. The technology solves the problems of cold damage, water damage and residue damage, and has the advantages of good environmentally-friendly effect, wide application range, high compatibility, thorough gel breakage, simplicity in operation and high cost performance.

Description

technical field [0001] The invention relates to a process for increasing production in oil field development, in particular to a biological enzyme fracturing process for oil wells in an oil field. Background technique [0002] At present, for low-permeability and extra-low-permeability oil fields, fracturing technology has become one of the most commonly used and most effective methods for increasing oil well production and water well injection. However, water-based fracturing occupies more than 90% of the fracturing market due to its advantages of simple operation and low cost. However, there are three major damage problems in water-based fracturing: cold damage, water damage and residue damage. A large amount of cold water is injected into the formation along with fracturing, which will cause a lot of damage to the formation around the fracture, such as water sensitivity, water lock, speed sensitivity, etc. At the same time, changes in pressure and temperature will cause ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/267
Inventor 王俊奇陈军斌屈展盖海防
Owner XI'AN PETROLEUM UNIVERSITY
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