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Biological enzyme blocking remover used for oil and gas fields, and applications thereof

A technology of biological enzymes and plugging agents, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve problems such as equipment and pipeline corrosion, secondary pollution of oil layers, corrosion of oil pipelines, etc., and achieve formation blockage, protection Oil layer, irritation-reducing effect

Inactive Publication Date: 2017-02-15
DALIAN BITEOMICS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This technology has many shortcomings, such as inconvenient construction; corrosion to equipment and pipelines; secondary pollution to the oil layer, high concentration of acid will destroy the cement of the sandstone, resulting in serious sand production in the oil well, and new blockages to the formation; Corrosion of the oil pipeline during flowback; residual acid in crude oil will affect the electric dehydration station; due to its strong acidity, it will cause serious damage to ground vegetation

Method used

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  • Biological enzyme blocking remover used for oil and gas fields, and applications thereof
  • Biological enzyme blocking remover used for oil and gas fields, and applications thereof
  • Biological enzyme blocking remover used for oil and gas fields, and applications thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Blockage remover formula (by weight percentage)

[0024]

[0025] The indoor evaluation method refers to the test method in the enterprise standard "Q / DBIT0003-2014" of Dalian Bio-Thera Technology Co., Ltd.

[0026] Take 3g of the dried mud sample and add it to 100g of the prepared 10-fold diluted plugging remover, treat it in an 80°C water bath for 3 hours, filter, dry, and weigh. The calculated degradation rate is 18.9%. The treated mud is in the form of loose particles or powder, with good fluidity and easy flowback.

Embodiment 2

[0030] Blockage remover formula (by weight percentage)

[0031]

[0032] Take 3g of the dried mud sample and add it to 100g of the prepared 10-fold diluted plugging remover, treat it in an 80°C water bath for 3 hours, filter, dry, and weigh. The calculated degradation rate is 20.5%. The treated mud is in the form of loose particles or powder, with good fluidity and easy flowback.

Embodiment 3

[0034] (1) Bio-enzyme compound plug-removing agent formula (by weight percentage)

[0035]

[0036] (2) Plugging simulation experiment

[0037] Core experiments can approximate plug formation and removal effects. The instrument used in the experiment is FDS800-6000 reservoir damage evaluation device. The cores used in the experiment are ceramic cores, and the relevant parameters of the cores and the relevant parameters during the experiment are shown in the table below.

[0038] Table 1: Related parameters and experimental results

[0039] parameter Flow rate, ml / min Fluid viscosity, mPa·s Core length, cm Core diameter, cm value 2.0 0.50 6.005 2.521

[0040] The formula for calculating permeability is as follows:

[0041]

[0042] In the formula, K——permeability, μm 2 ;

[0043] △P——pressure difference between the two ends of the core, MPa;

[0044] A—core cross-sectional area, cm 2 ;

[0045] μ—fluid viscosity, mPa·s;

[0046] L—...

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PUM

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Abstract

The invention relates to a biological enzyme blocking remover used for stratum blocking removing in oil and gas exploitation. The biological enzyme blocking remover is composed of a complexing agent, an acid, a corrosion inhibitor, a penetrating agent, a clay stabilizer, a pH conditioning agent, and a certain amount of a biological enzyme. The biological enzyme blocking remover possesses excellent blocking removing effect on blocking of oil and gas fields caused by a plurality of reasons, and is capable of increasing productivity of oil and gas fields greatly, and achieving excellent production increase effect.

Description

technical field [0001] The invention relates to a biological enzyme plug-removing agent used in the field of oil and gas field exploitation, which belongs to a composite plug-removing agent. Background technique [0002] Formation plugging is a common phenomenon in oil and gas fields. Various measures such as drilling, cementing, well completion, fracturing and water injection may cause damage to the formation and lead to plugging. After the blockage occurs, it will lead to the failure of water injection, the failure of oil and gas production, and even the occurrence of dead wells, which will eventually lead to serious economic losses. [0003] Plugging is mainly caused by improper measures taken during drilling, cementing, fracturing, acidizing and other operations. During the operation, the formation changes, the original pores of the formation are damaged, or the throat holes of the formation are blocked by foreign substances, which will lead to the decrease of the forma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/524C09K8/528
CPCC09K8/524C09K8/528
Inventor 梅晓丹王平强新新马雯雯刘美娜
Owner DALIAN BITEOMICS INC
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