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Hyposmosis oil pool microbial oil recovery method

A technology of microbial oil recovery and low permeability, applied in the field of oil production, can solve the problems of oil and water well casing deformation damage, rapid oil production decline, construction safety and other problems, and achieve the effect of improving seepage capacity, improving recovery degree and promoting stability

Active Publication Date: 2010-04-28
DAQING HUALI ENERGY BIOLOGICAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, the increase of water injection pressure will also cause deformation and damage to the casing of oil and water wells, which seriously threatens the normal water injection development of oil fields.
[0009] 2 The water injection effect of the production well is poor, and the oil production declines rapidly
[0013] It can be seen that although temporary plugging fracturing or refracturing can alleviate the decline in oil well production, it cannot solve the problems of formation wax deposition and scaling. On the other hand, these measures also require a large amount of investment and exist construction safety issues

Method used

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Examples

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Effect test

Embodiment 1

[0035] 1. Well A1-11 in an oilfield, the oil layer thickness is H=14.4m, the fracture length L=50m, the treatment width W=0.1m (0.05m on both sides of the fracture), and the microbial treatment rectangular area is calculated according to formula (1) The volume is V=72m 3 . The comprehensive coefficient Fc=0.8 is selected, and the concentration of the microbial fermentation broth is 5%. The amount of microbial solution injected is 57.6m 3 , of which, the amount of microbial fermentation broth is 2.88m 3 , and the rest is nutrient solution, which is prepared from the produced water of the block, including 0.15% peptone, 0.2% yeast extract, 2.0% KCl, NaH 2 PO 4 0.12%. The well was shut down for 1 day after the microbial solution was injected, and then normal production resumed. After the well resumed production, the liquid production was stable and the water cut decreased. Daily oil production increased from 1.3t to 3.5t, with a cumulative increase of 157t.

[0036] 2. We...

Embodiment 2-5

[0039] A microbial oil recovery method for low-permeability oil reservoirs: comprising the following steps: injecting microbes and nutrients after fracturing the low-permeability oil reservoirs for oil recovery. This method combines reservoir fracturing and microbial oil recovery. On the one hand, it increases the scope of action of microorganisms in low-permeability reservoirs. The production of oil wells is stable and the stable production time of oil fields is extended, so it is a scientific, economical and effective microbial oil recovery method for low-permeability reservoirs.

[0040] The main steps are to firstly perform fracturing on the low-permeability oil layer, and then inject microorganisms into the deep part of the reservoir through the fracturing fractures, so as to promote the reproduction and function of microorganisms in the reservoir, improve the degree of crude oil recovery and the seepage capacity of formation fluid, and finally Oil wells obtain crude oil,...

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Abstract

The invention relates to a hyposmosis oil pool microbial oil recovery method, comprising the following steps: (1) fracturing production is carried out to the hyposmosis oil pool; (2) microbes and nutrients are filled in an oil layer from cracks formed by fracturing to carry out microbial oil recovery. Compared with the prior art, the oil pool fracturing and the microbial oil recovery are combined together, so as to increase the action range of the microbes in the hyposmosis oil pool on one hand, on the other hand, the metabolic action of the microbes is helpful to keeping seeping channels to be open at the fracturing position, thereby promoting stable output of oil wells and prolonging steady yield time of oil fields; therefore, the invention is a scientific, economic and effective hyposmosis oil pool microbial oil recovery method.

Description

technical field [0001] The invention relates to an oil recovery method, in particular to a microbial oil recovery method for a low-permeability oil reservoir. Background technique [0002] According to the new round of oil and gas resources evaluation results of the Ministry of Land and Resources and the National Development and Reform Commission, the national oil resources are 108.6 billion tons (excluding Taiwan and the South China Sea), of which low-permeability resources are 53.7 billion tons, accounting for 49% of the total resources; The amount of resources is 56 trillion cubic meters, of which low-permeability resources are 24 trillion cubic meters, accounting for 42.8% of the total resources. The country's cumulative proven petroleum geological reserves are 28.7 billion tons, of which low-permeability resources are 14.1 billion tons, accounting for 49.2%. The country's cumulative proven natural gas geological reserves are 6.42 trillion cubic meters, of which low-per...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/22C12S1/00C09K8/582C09K8/52C12R1/40C12R1/39C12R1/385C12R1/01C12R1/07C12R1/145C12R1/125
CPCC09K8/582E21B43/16
Inventor 刘金峰牟伯中杨世忠周蕾
Owner DAQING HUALI ENERGY BIOLOGICAL TECH
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