Water injection well decompression and injection-augmentation agent containing biosurfactant

A surfactant and biological surface technology, applied in the direction of drilling composition, chemical instruments and methods, etc., can solve the problems of short validity period, weak adsorption of depressurization and increasing injection agent, limited effect of depressurizing and increasing injection, etc., and achieve The effect of small amount of use, improved water injection capacity, and low price

Active Publication Date: 2018-09-21
DAQING HUALI ENERGY BIOLOGICAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These types of depressurization and boosting agents have weak adsorption

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0018] Example 1:

[0019] This embodiment provides a biosurfactant-containing depressurization enhancer for water injection wells. In parts by weight, its raw material components include:

[0020] 62 parts of lipopeptide biosurfactant;

[0021] 31 parts of amphoteric surfactant (erucyl amidopropyl betaine: octadecyl hydroxypropyl sultaine = 1:2);

[0022] 3 parts of co-solvent (isopropanol: n-butanol: isoamyl alcohol=1:1:1);

[0023] 3 parts of clay stabilizer (potassium carbonate: potassium chloride=1: 2);

[0024] 2 parts of anti-scaling agent (polymethacrylic acid:).

[0025] Add lipopeptide biosurfactant, amphoteric surfactant and co-solvent to the reaction kettle, slowly raise the temperature to 30°C for continuous heat preservation, and stir to make it evenly mixed; add scale inhibitor to the uniformly mixed surfactant solution and stir Dissolving and mixing uniformly; adding a clay stabilizer to the mixed solution and stirring until uniformly mixed to obtain the depressurizing in...

Example Embodiment

[0027] Example 2:

[0028] This embodiment provides a biosurfactant-containing depressurization enhancer for water injection wells. In parts by weight, its raw material components include:

[0029] 71 parts of lipopeptide biosurfactant;

[0030] 22 parts of amphoteric surfactant (coconut oil methyl monoethanolamine: cocamidopropyl betaine: cocamidopropyl hydroxysulfobetaine = 2:1:2);

[0031] 5 parts of co-solvent (isopropanol: n-butanol: isoamyl alcohol=1:1:1);

[0032] 5 parts of clay stabilizer (potassium carbonate: potassium chloride=1: 2);

[0033] 3 parts of antiscalant (polymethacrylic acid).

[0034] The preparation method at 45°C is the same as in Example 1.

[0035] Use effect: 0.30% of the amount is added to the formation injection water, and then injected into the water well with a high-pressure plunger pump, the wellhead pressure of the water injection well drops by 3.0MPa, and the water injection volume increases by 8%.

Example Embodiment

[0036] Example 3:

[0037] This embodiment provides a biosurfactant-containing depressurization enhancer for water injection wells. In parts by weight, its raw material components include:

[0038] 67 parts of lipopeptide biosurfactant;

[0039] 25 parts of amphoteric surfactant (octadecyl hydroxypropyl sultaine: cocamidopropyl betaine = 1:2);

[0040] 4 parts of co-solvent (isopropanol: n-butanol: isoamyl alcohol=1:1:1);

[0041] 3 parts of clay stabilizer (potassium carbonate: potassium chloride=1: 2);

[0042] 4 parts of anti-scaling agent (polymethacrylic acid);

[0043] 50 parts of water.

[0044] At 45°C, the preparation method is the same as in Example 1.

[0045] Use effect: 0.30% of the amount is added to the formation injection water, and then injected into the water well with a high-pressure plunger pump, the wellhead pressure of the water injection well drops by 3.3 MPa, and the water injection volume increases by 7 percentage points.

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Abstract

The invention discloses a water injection well decompression and injection-augmentation agent containing biosurfactant, and relates to the technical field of oil exploitation auxiliaries. The water injection well decompression and injection-augmentation agent containing the biosurfactant is prepared from, by weight, 62-71 parts of lipopeptide biosurfactant, 22-31 parts of ampholytic surfactant, 3-5 parts of solubilizing assistant, 3-5 parts of clay stabilizer and 2-4 parts of scale inhibitor. According to the water injection well decompression and injection-augmentation agent containing the biosurfactant, wettability can be changed, oil-water interfacial tension is lowered to 10<-3> mN/m, in this way, starting of residual oil is facilitated, the phenomenon that the decompression and injection-augmentation agent causes emulsification to crude oil, so that water injection pressure rises can be avoided, the water injection well water injection pressure is effectively lowered, and the under injection well water injection capacity is improved; meanwhile, clay swelling can be prevented, and damage of carbonate precipitation such as calcium carbonate to stratum can be inhibited; the lipopeptide biosurfactant is adopted as the biosurfactant, and the water injection well decompression and injection-augmentation agent has the advantages of being environmentally friendly, low in dosage, good in water solubility, low in price and the like.

Description

technical field [0001] The invention relates to the technical field of petroleum recovery additives, in particular to a pressure-reducing and injection-increasing agent for water injection wells containing a biosurfactant. Background technique [0002] With the continuous increase of energy demand and the continuous reduction of crude oil reserves, the development status of low-permeability oil reservoirs is becoming more and more prominent. At present, my country's accumulated proven petroleum geological reserves are 28.7 billion tons, of which the low-permeability layer reserves are 14.1 billion tons, accounting for 49.1%. The remaining amount of oil resources is 79.9 billion tons, and the low permeability is 43.1 billion tons, accounting for 53.9%. With the improvement of oil and gas development technology, the development of low-permeability reservoirs will become the main battlefield of my country's oil development. [0003] Low permeability reservoirs have high conte...

Claims

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Application Information

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IPC IPC(8): C09K8/584C09K8/528C09K8/52
CPCC09K8/52C09K8/528C09K8/584C09K2208/12
Inventor 李波吴连贺刘长宇王柱李国军
Owner DAQING HUALI ENERGY BIOLOGICAL TECH
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