A microbial huff and puff oil recovery method for high water-cut heavy oil reservoirs, a heavy oil viscosity reduction method for high water-cut heavy oil reservoirs, and a nutrient activator

A technology of heavy oil reservoirs and microbes, applied in drilling compositions, chemical instruments and methods, production fluids, etc., can solve problems such as material waste

Active Publication Date: 2022-04-12
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a microbial huff and puff oil recovery method for high water-cut heavy oil reservoirs, so as to solve the problem of serious waste of materials in the development of high water-cut heavy oil reservoirs using microbial huff and puff oil recovery methods in the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] The implementation object of this embodiment is a certain oil well, the crude oil viscosity of this oil well is 11054mPa·s (under the oil layer temperature), the oil layer temperature is 63 ℃, the oil layer is 1.5m away from the lower water layer, the formation fracture pressure is 12MPa, and the original bacteria content is 10 1-2 pieces / mL, salinity 80000mg / L, formation water sensitive. The oil layer is 3.4m thick with a porosity of 28%; the lower water layer is 2.3m thick with a porosity of 21%. Due to steam injection and interlayer channeling, the water content of the produced fluid suddenly rose from 64% in the previous round to 100%, resulting in the temporary shutdown of the oil well for one year. The produced water of the oil well in this example was subjected to indoor evaluation experiments under reservoir conditions, and it was confirmed that the microbial huff and puff oil recovery method for high water-cut heavy oil reservoirs of the present invention can b...

Embodiment 2

[0070] The crude oil viscosity of a certain oil well as the embodiment object of this embodiment is 768mPa·s (under the oil layer temperature), the oil layer temperature is 42°C, the oil layer is 0m away from the lower water layer, the formation fracture pressure is 8.5MPa, and the original bacteria content is 10 2 / mL, salinity 90000mg / L, formation water sensitive. The oil layer is 3.1m thick with a porosity of 27%; the lower water layer is 2.1m thick with a porosity of 19%. The oil well is driven by bottom water for normal production. After 6 months of production, the water content of the produced fluid suddenly rose from 45% to 98% within two months, causing the oil well to be temporarily shut down for half a year. The produced water of the oil well in this example was subjected to indoor evaluation experiments under reservoir conditions, and it was confirmed that the microbial huff and puff oil recovery method for high water-cut heavy oil reservoirs of the present inventio...

Embodiment 3

[0082] The oil well crude oil viscosity as the implementation object of this embodiment is 3847mPa·s (under the oil layer temperature), the oil layer temperature is 36 ℃, the oil layer is 1m apart from the lower water layer, the formation fracture pressure is 6MPa, and the original bacteria content is 10 1-2 / mL, salinity 45000mg / L, the formation is not water sensitive. The oil layer is 2.8m thick with a porosity of 29%; the lower water layer is 2.9m thick with a porosity of 26%. Due to steam injection and interlayer channeling, the water content of the produced fluid suddenly rose from 71% in the previous cycle to 100%, resulting in the temporary shutdown of the oil well for 2 years. The produced water of the oil well in this example was subjected to indoor evaluation experiments under reservoir conditions, and it was confirmed that the microbial huff and puff oil recovery method for high water-cut heavy oil reservoirs of the present invention can be implemented without injec...

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Abstract

The invention relates to a microbial huff and puff oil recovery method for heavy oil reservoirs with high water content, a heavy oil viscosity reduction method for heavy oil reservoirs with high water content, and a nutrient activator, belonging to the technical field of oil field chemistry. The method for adopting microbial huff and puff of high water content heavy oil reservoirs of the present invention comprises the following steps: 1) injecting a water shutoff agent into the oil well to shut off water; 2) then injecting a nutrient activator or injecting exogenous bacteria and a nutrient activator to stew the well; 3) Proceed to production after the braising well is finished. In the microbial huff and puff oil recovery method of the present invention, before injecting the nutrient activator or exogenous bacteria and nutrient activator into the oil well, the water blocking agent is injected into the oil well to block water, reducing the nutrient activator and the exogenous bacteria injected into the water layer. The amount greatly reduces the cost of microbial huff and puff oil recovery in heavy oil reservoirs with high water cut.

Description

technical field [0001] The invention relates to a microbial huff and puff oil recovery method for heavy oil reservoirs with high water content, a heavy oil viscosity reduction method for heavy oil reservoirs with high water content, and a nutrient activator, belonging to the technical field of oil field chemistry. Background technique [0002] Heavy oil refers to the crude oil with the viscosity of formation crude oil above 50mPa·s or the viscosity of degassed crude oil above 100mPa·s at formation temperature. It is also called heavy crude oil because of its high density. Due to the poor fluidity of crude oil and the high mobility ratio of water flooding, it is difficult to achieve long-term effective development in heavy oil reservoirs by conventional methods. Thermal recovery methods such as steam huff and puff or steam flooding or microbial cold recovery technologies are usually used for development. Microbial huff and puff oil recovery technology is a kind of microbial c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/22E21B33/13C09K8/582C09K8/584C09K8/44
CPCE21B43/16E21B33/13C09K8/582C09K8/584C09K8/44
Inventor 郝春雷常国栋王晓东王新亮王孟江徐丽娜
Owner CHINA PETROLEUM & CHEM CORP
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