An evaluation method for microbial huff and puff injection in heavy oil reservoirs with active edge and bottom water

A technology for heavy oil reservoirs and evaluation methods, applied in biochemical equipment and methods, microbial measurement/inspection, earth square drilling and production, etc. It can solve the problems of large differences in effects, unconsidered development contradictions of heavy oil wells, water cut rise, etc. problem, to achieve the effect of simple method, good field application effect and increased success rate

Active Publication Date: 2022-04-15
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The indoor optimization evaluation of microbial huff and puff injection in the early stage mainly refers to the activator screening and evaluation technology system in microbial oil flooding technology, mainly to investigate the activation effect of microbial injection on reservoir microorganisms in anaerobic bottles, the emulsification and viscosity reduction effect of crude oil, However, this evaluation system does not take into account the development contradictions of heavy oil wells applied by microbial single well huff and puff technology, especially for heavy oil reservoirs with active edge and bottom water. The emulsification and viscosity reduction effect of the injection agent on crude oil will also cause bottom water coning and water content to rise rapidly like steam injection in thermal recovery, resulting in large differences in field implementation effects
Therefore, the current injection agent evaluation system is not completely suitable for huff and puff wells in heavy oil reservoirs with edge and bottom water. The success rate of microbial huff and puff technology in active edge and bottom water reservoirs

Method used

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  • An evaluation method for microbial huff and puff injection in heavy oil reservoirs with active edge and bottom water
  • An evaluation method for microbial huff and puff injection in heavy oil reservoirs with active edge and bottom water
  • An evaluation method for microbial huff and puff injection in heavy oil reservoirs with active edge and bottom water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Side and bottom water heavy oil well P in a certain block of Shengli Oilfield 17 The reservoir temperature is 60°C, the reservoir pressure is 12MPa, the crude oil viscosity is 5980mPa·s, and the total salinity of formation water is 13920mg / cm 3 , crude oil density 0.9419g / cm 3 , permeability 1500×10 -3 μm 2 , Pore volume 35.7%. Utilize technical scheme of the present invention to screen out P 17 The injection formula for well huff and puff, the specific steps are as follows:

[0053] 1. Preliminary evaluation of the injection

[0054] The laboratory evaluation results show that the oil well is treated by endogenous huff and puff, therefore, the injection agent of the present invention is an activator.

[0055] The indicators of the preliminary evaluation of the injection are the evaluation of the microbial activation effect, the evaluation of the surface tension change effect, and the interfacial tension change effect evaluation.

[0056] Described microbial acti...

Embodiment 2

[0098] Side and bottom water heavy oil well P in a certain block of Shengli Oilfield 14 The reservoir temperature is 75°C, reservoir pressure is 15MPa, crude oil viscosity is 7312mPa·s, and the total salinity of formation water is 5030mg / cm 3 , crude oil density 0.9729g / cm 3 , permeability 700×10 -3 μm 2 , Pore volume 31.7%. Utilize technical scheme of the present invention to screen out P 14 The injection formula for well huff and puff, the specific steps are as follows:

[0099] 1. Preliminary evaluation of the injection

[0100] The laboratory evaluation results show that the oil well is treated by endogenous huff and puff, therefore, the injection agent of the present invention is an activator.

[0101] The indicators of the preliminary evaluation of the injection are the evaluation of the microbial activation effect, the evaluation of the surface tension change effect, and the interfacial tension change effect evaluation.

[0102] Described microbial activation eff...

Embodiment 3

[0141] Heavy oil well with edge and bottom water in a certain block of Shengli Oilfield X 28 The reservoir temperature is 62°C, the reservoir pressure is 11MPa, the viscosity of crude oil is 2360mPa·s, and the total salinity of formation water is 3040mg / cm 3 , crude oil density 0.9612g / cm 3 , permeability 513×10 -3 μm 2 , Pore volume 30.1%. Utilize the technical scheme of the present invention to screen out X 28 The injection formula for well huff and puff, the specific steps are as follows:

[0142] 1. Preliminary evaluation of the injection

[0143] The laboratory evaluation results show that the oil well is treated by endogenous huff and puff, therefore, the injection agent of the present invention is an activator.

[0144] The indicators of the preliminary evaluation of the injection are the evaluation of the microbial activation effect, the evaluation of the surface tension change effect, and the interfacial tension change effect evaluation.

[0145] Described micr...

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Abstract

The invention belongs to the field of microbial oil recovery, and in particular relates to an evaluation method for a microbial huff and puff injection agent for heavy oil reservoirs with active edge and bottom water. The method specifically includes the following steps: preliminary evaluation of the injection, the indicators of the preliminary evaluation of the injection are microbial activation effect evaluation, surface tension change effect evaluation, interfacial tension change effect evaluation; injection comprehensive evaluation, injection comprehensive evaluation index For the evaluation of crude oil stripping effect, porous media passability evaluation, and development effect evaluation; according to the comprehensive evaluation results of the injection, the injection formulations of 2-3 groups screened out for physical model evaluation; the physical model evaluation of the injection, through the injection The physical model was evaluated to screen out the final injection formulation. The microbial huff and puff injection obtained by screening in the present invention can effectively improve the success rate of huff and puff implementation in active edge and bottom water reservoirs and the field test effect, the implementation success rate is increased by 50 percentage points, the average daily oil increase reaches more than 12.0t, and the input-output ratio Greater than 1:10.

Description

technical field [0001] The invention relates to the field of microbial oil recovery, in particular to an evaluation method for a microbial huff and puff injection agent for heavy oil reservoirs with active edge and bottom water. Background technique [0002] At present, the development methods of heavy oil reservoirs mainly include water flooding and steam thermal recovery huff and puff. Heavy oil reservoirs, especially heavy oil reservoirs with edge and bottom water, only the thermally recovered heavy oil reservoirs in Shengli Oilfield have geological reserves of 502 million tons. Thermally recovered heavy oil reservoirs account for 43%. The main contradictions in the development of heavy oil reservoirs with edge-bottom hydrothermal recovery are that the high strength of the water body can easily cause edge water intrusion and bottom water coning; the viscosity of crude oil is high and the oil-water mobility ratio is large. At present, this type of reservoir is usually de...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G16C60/00E21B43/16C12Q1/64
CPCG16C60/00E21B43/16C12Q1/64
Inventor 王增林孙刚正杜勇陈琼瑶张吉星冯逸茹于丹丹王冠宋欣冯云
Owner CHINA PETROLEUM & CHEM CORP
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