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Composite microorganism oil-displacing agent

A technology of composite microorganisms and oil displacement agents, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of limited types of metabolites, achieve the effects of improving recovery, improving overall effect, and expanding swept volume

Active Publication Date: 2009-09-30
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The currently used native microbial activators are limited to providing basic nutrients, P and N, do not contain trace elements and are easy to be used by microorganisms as carbon sources, the types of activated microorganisms, and the types of metabolites are also limited, so comprehensive nutritional microorganisms are required Oil displacement agent, greatly improve the oil displacement effect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Reservoir selection temperature is less than 90°C, water salinity is less than 100g / L, and the number of microorganisms is greater than 10 2 Individual / mL, water injection development for more than 1 year.

[0017] The equipment for on-site construction includes a dissolution tank with a stirring device and a plunger pump with a large displacement for injecting the solution. First, start the stirring device in the dissolution tank filled with quantitative water, then slowly add dry polymer powder to make it fully dissolved, then add wheat and corn processing by-products, mix well, add trace elements and inject into the water injection well .

[0018] The composite microbial oil displacement agent is a mixed solution composed of 8% by-products of wheat processing by weight, 1% by-products of corn processing by weight, 3% by-products of wood processing by weight and the balance is water, adding 10mg / L trace Elements and 300mg / L polyacrylamide, the particle size of agric...

Embodiment 2

[0033] The composite microbial oil displacement agent is a mixed solution composed of 1% by-product of wheat processing by weight, 8% by-product of corn processing by weight, 6% by-product of wood processing by weight and the balance is water, adding 5mg / L trace Elements and 300mg / L polyacrylamide, the particle size of agricultural and wood processing by-products is less than 0.5mm, and the injection is supplemented by the injection of oxygen-containing air.

[0034] Experimental method and result are the same as embodiment 1.

Embodiment 3

[0036] The composite microbial oil displacement agent is a mixed solution composed of 4% by-product of wheat processing by weight, 4% by-product of corn processing by weight, 0.5% by-product of wood processing and balance of water, adding 7mg / L trace Elements and 300mg / L polyacrylamide, the particle size of agricultural and wood processing by-products is less than 0.5mm, and the injection is supplemented by the injection of oxygen-containing air.

[0037] Experimental method and result are the same as embodiment 1.

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Abstract

The invention relates to a composite microorganism oil-displacing agent for improving the oil recovery rate. The composite microorganism oil-displacing agent is prepared by adding mixed liquid containing 1-8 percent of byproducts of triticeae crops, 1-8 percent of byproducts of maize, 0.5-6 percent of byproducts of wood and the balanced of water by weight into 5-10mg / L trace element and 300-500mg / L polyacrylamide, wherein the particle diameters of the byproducts of crops and wood are smaller than 0.5 mm. The composite microorganism oil-displacing agent is filled with the aid of oxygen-containing air, has dual functions of providing nutrition for microorganism and plugging a high permeability zone, can enlarge the swept volume of nutrient fluid and the fermentation range of the microorganism, prolong the acting time between the microorganism and rock and fluid in an oil layer, satisfy the requirement for fermentation time, provide conditions for biological action and biochemical action and improve the whole effect of microorganism oil recovery, e.g. the recovery rate is increased by 12-15 percent based on water drive.

Description

technical field [0001] The invention relates to a compound microbial oil displacement agent for enhancing crude oil recovery, which is composed of agricultural wood processing by-products and trace elements, and is suitable for the original microbial activity and metabolism of oil reservoirs developed at the middle and high water content stage in the oil exploitation process. technical background [0002] In microbial oil recovery technology, including indigenous and exogenous microbial oil flooding, the fluidity of the nutrient solution, bacteria solution and bacteria-containing nutrient solution used is very good, and the viscosity is low, which is similar to that of injected water. In the old oil fields developed by water flooding for many years, due to the continuous erosion of injected water and the heterogeneity of the oil layer itself, high permeability bands with unequal permeability have been produced, resulting in ineffective water circulation. However, the microbi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/582
Inventor 冯庆贤程海鹰梁建春马先平杨怀军柳敏李辉史明义汪娟娟滕克孟
Owner PETROCHINA CO LTD
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