Biological modifying and flooding agent capable of resisting against high temperature and high salt for oil field exploitation

A medium-high-temperature technology for regulating and displacing agents, which is applied in the fields of mining fluids, drilling compositions, earthwork drilling, etc., can solve the problems of reducing interfacial tension, unstable performance, and inapplicability, so as to improve the residual resistance coefficient and improve the Effect of Drag Coefficient, High Sweep Coefficient

Inactive Publication Date: 2017-08-18
ANJARL BEIJING OILFIELD TECHN SERVICES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this kind of surfactant liquid has a series of problems such as unstable performance, poor resistance to salt, especially divalent cations, etc., and is not suitable for oilfield blocks with high temperature and high salt
At present, surfactants have been successfully applied in ordinary oil reservoirs (first and second types of

Method used

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  • Biological modifying and flooding agent capable of resisting against high temperature and high salt for oil field exploitation
  • Biological modifying and flooding agent capable of resisting against high temperature and high salt for oil field exploitation
  • Biological modifying and flooding agent capable of resisting against high temperature and high salt for oil field exploitation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Example 1: Preparation of medium-high-temperature, high-salt bio-displacement agent for oilfield development

[0035] 1. Formulation:

[0036] Microbial polysaccharide 1%, surfactant 0.1%, bonding force promoter 0.05, and the balance is water. The above are all percentages by weight.

[0037] Among them, the microbial polysaccharide is welan gum, the surfactant is betaine, the bonding force promoter is curdlan gum, and modified starch in a mass ratio of 1:1.

[0038] 2. Preparation method:

[0039] (1) Dissolve the microbial polysaccharide (welan gum) with part of the water (1 / 3 of the water), pre-swell, the pre-swelling temperature is 25°C, and the pre-swelling time is 30min, to obtain the microbial polysaccharide solution;

[0040] (2) Add the surfactant (betaine) and the bonding force promoter into the remaining water, stir to dissolve; then add the microbial polysaccharide solution, and continue to stir for 1 hour to obtain the bio-displacement agent.

Embodiment 2

[0041] Example 2: Preparation of medium-high-temperature, high-salt bio-displacement agent for oilfield development

[0042] 1. Formulation:

[0043] 1.1% of microbial polysaccharide, 0.5% of surfactant, 2.5% of bonding force accelerator, and the balance is water.

[0044] Among them, the microbial polysaccharide is welan gum, the surfactant is rhamnolipid, the bonding force promoter is locust bean gum and curdlan gum, and they are mixed according to the mass ratio of 1:1.

[0045] The preparation method is the same as in Example 1.

Embodiment 3

[0046] Example 3: Preparation of medium-high-temperature, high-salt bio-displacement agent for oilfield development

[0047] 1. Formulation:

[0048] Microbial polysaccharide 1.0%, surfactant 0.6%, bonding force accelerator 5%, and the balance is water.

[0049] Among them, the microbial polysaccharide is welan gum, the surfactant is rhamnolipid, and the bonding force promoter is a mixture of sodium citrate and curdlan gum in a mass ratio of 1:3.

[0050] The preparation method is the same as in Example 1.

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PUM

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Abstract

The invention discloses a biological modifying and flooding agent capable of resisting against high temperature and high salt for oil field exploitation. The biological modifying and flooding agent is prepared from the following raw materials by weight percent: 0.01-5% of microbial polysaccharide, 0.05-10% of surfactant, 0.01-10% of binding force accelerator and the balance of water. The biological modifying and flooding agent disclosed by the invention is capable of forming lower interfacial tension with the crude oil, has relative stable viscosity and can keep higher involving rate under alkali-free, high-temperature and high-salt conditions; the application scope is wide; the operability is simple and convenient; the use cost of the user is lowered; and the environmental pressure is reduced.

Description

technical field [0001] The invention relates to a medium-high-temperature-resistant, high-salt biological control and displacement agent for oilfield exploitation, which belongs to the technical field of oil exploitation. Background technique [0002] After decades of exploitation, my country's oil fields have entered a stage of high water cut, and the production is facing a decline. The development of tertiary oil recovery is an important way to improve oil recovery. Tertiary oil recovery is compared with primary and secondary oil recovery. In layman's terms, in the initial stage of oil exploitation, only the natural energy of the formation is used to extract oil, which is called primary oil recovery, and its recovery rate is only about 10%. The method of extracting oil by adding energy to the formation, such as water injection, gas injection, etc., is called secondary oil recovery. At present, a large number of oil fields in the world have adopted the secondary oil recov...

Claims

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Application Information

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IPC IPC(8): C09K8/58C09K8/584C09K8/588E21B43/22
CPCC09K8/58C09K8/584C09K8/588E21B43/16
Inventor 严希海赵娜严谨万丽萍
Owner ANJARL BEIJING OILFIELD TECHN SERVICES
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