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Edge-bottom water heavy oil reservoir horizontal well microbial huff and puff method

A technology for heavy oil reservoirs and horizontal wells, which is applied in earthwork drilling, wellbore/well components, and production fluids, etc. It can solve the problem that chemical water plugging methods are not easy to control the amount of plugging agent, and it does not involve supporting production methods and does not involve Crude oil viscosity reduction and other issues, to achieve good field test results, high input-output ratio, pertinence and strong operability

Pending Publication Date: 2022-05-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention has the following problems: (1) The chemical water plugging method is not easy to control the amount of plugging agent, and the plugging radius is small; (2) This patent is only a simple water plugging method for horizontal wells, and does not involve comprehensive horizontal wells such as crude oil viscosity reduction. mining method
The invention has the following problems: (1) The water plugging method provided by this patent is not optimized according to the degree of water flooding; (2) It does not involve the supporting production methods of horizontal wells such as crude oil viscosity reduction

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Horizontal Well A in a block of Shengli Oilfield 12 , the burial depth is 1072m~1250m, the reservoir temperature is 75℃, and the reservoir permeability is 700×10 -3 μm 2 , crude oil viscosity 1250mPa.s, formation water salinity 12300mg / L, effective thickness 7.2m, horizontal well section length 180m, water flooded layer length 18m, daily liquid production 125m 3 , with a water content of 98.7%, and the presence of Pseudomonas 2.0×10 in the output liquid was detected by sampling 3 Individual / ml, Xanthobacterium 1.0×10 3 Individuals / ml, Serratia 5.0×10 3 pieces / ml. Utilize the method of the present invention to implement increasing oil to this oil well, concrete implementation steps are as follows:

[0053] Horizontal well A 12 The reservoir temperature is 75℃, and the reservoir permeability is 700×10 -3 μm 2 , the viscosity of crude oil is 1250mPa.s, the salinity of formation water is 12300mg / L, the effective thickness is 7.2m, the length of the horizontal well s...

Embodiment 2

[0070] Horizontal Well A in a block of Shengli Oilfield 15 , the burial depth is 1098m~1185m, the reservoir temperature is 72℃, and the reservoir permeability is 950×10 -3 μm 2 , the viscosity of crude oil is 890mPa.s, the salinity of formation water is 18500mg / L, the effective thickness is 10m, the length of horizontal well section is 175m, the length of water flooded layer is 12m, and the daily liquid production is 100m 3 , with a water content of 98.2%, and the presence of Acinetobacter 1.0×10 in the output liquid was detected by sampling 3 Individuals / ml, Xanthomonas 2.0×10 3 Individuals / ml, Geobacillus stearothermophilus 1.0×10 2 pieces / ml. Utilize the method of the present invention to implement increasing oil in this oil well, concrete implementation steps are as follows:

[0071] Horizontal well A 15 The reservoir temperature is 72℃, and the reservoir permeability is 950×10 -3 μm 2 , the viscosity of crude oil is 890mPa.s, the salinity of formation water is 185...

Embodiment 3

[0088] Horizontal well C in a block of Shengli Oilfield 10 , the reservoir temperature is 63°C, and the reservoir permeability is 1200×10 -3 μm 2 , crude oil viscosity 850mPa.s, formation water salinity 21500mg / L, effective thickness 9.5m, horizontal well section length 150m, water flooded layer length 16m, daily fluid production 120m 3 , with a water content of 99.0%, and the presence of Brevibacillus 1.0×10 in the output liquid was detected by sampling 2 Individuals / ml, Xanthomonas 1.0×10 3 individual / ml, Bacillus pumilus 1.0×10 3 pieces / ml. Utilize the method of the present invention to implement increasing oil in this oil well, concrete implementation steps are as follows:

[0089] Horizontal well C 10 The reservoir temperature is 63℃, and the reservoir permeability is 1200×10 -3 μm 2 , the viscosity of crude oil is 850mPa.s, the salinity of formation water is 21500mg / L, the effective thickness is 9.5m, the length of the horizontal well section is 150m, and the len...

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PUM

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Abstract

The invention belongs to the technical field of microbial oil recovery, and particularly relates to an edge-bottom water heavy oil reservoir horizontal well microbial huff and puff method. The method comprises the following steps: (1) in a horizontal well water-flooded section exploitation stage, the crude oil yield of a water-flooded section is increased by utilizing the action of hydrocarbon-philic bacteria and crude oil of the water-flooded section; and (2) a water plugging stage of a horizontal well water-flooded section, wherein the water-flooded section is plugged by using biopolymers generated by metabolism of the biopolymer producing bacteria. And (3) in the exploitation stage of the non-water-flooded section of the horizontal well, the yield of the crude oil in the non-water-flooded section is increased by utilizing the combined action of the biosurfactant generated by metabolism of the biosurfactant bacteria and the crude oil, the formation water and the rock in the non-water-flooded section. According to the method, different functional microorganisms or activators are selected according to the properties and distribution conditions of crude oil in different layers and sections of the horizontal well, and orderly mining is carried out in stages, so that efficient mining of the whole well section of the horizontal well is effectively realized. The oil increase of a single well is more than 500t, and the input-output ratio is greater than 1: 15.

Description

technical field [0001] The invention belongs to the technical field of microbial oil recovery, and relates to a microbial huff-and-puff method for edge-bottom water heavy oil reservoirs, in particular to a microbial huff-and-puff method for horizontal wells in edge-bottom water heavy oil reservoirs. Background technique [0002] With the deepening of oilfield development, the number of horizontal wells continues to increase. The main advantages of horizontal wells in the development of edge-bottom water reservoirs are: the "oil production point" can be turned into an "oil production line" to slow down the edge-bottom water coning; the contact area increases, It can effectively improve the production degree of the reservoir, and the production capacity can be improved compared with the vertical well; the production pressure difference of the horizontal well is relatively small, and the edge and bottom water are not easy to break through. However, once a horizontal well is flo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/22E21B43/16
CPCE21B43/16
Inventor 张宗檩吴晓玲赵润林冯云汪刚跃孙磉礅李彩风郭辽原林军章陈琼瑶
Owner CHINA PETROLEUM & CHEM CORP
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