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A method for microbial in-situ sand consolidation in unconsolidated sandstone reservoirs

A technology for sandstone oil reservoirs and microorganisms, which is used in earth-moving drilling, wellbore/well components, and production fluids, etc., to achieve the effects of reducing sand production, reasonable methods, and improving the degree of porosity

Active Publication Date: 2021-09-17
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Does not involve the scope of application of microbial oil recovery technology

Method used

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  • A method for microbial in-situ sand consolidation in unconsolidated sandstone reservoirs
  • A method for microbial in-situ sand consolidation in unconsolidated sandstone reservoirs
  • A method for microbial in-situ sand consolidation in unconsolidated sandstone reservoirs

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] GN in a block of Shengli Oilfield 11 Reservoir temperature is 40°C, porosity is 32%, average permeability is 1200×10 -3 μm 2 , belonging to unconsolidated sandstone reservoirs, with a shale content of 18%. Before the test, the comprehensive water content of the block was 97.5%, the daily oil production was 2.5t / d, and the daily liquid production was 50m 3 / d. There is a serious sand production problem in this block, which leads to the phenomenon of low oil well fluid volume and poor productivity in this block. The sand content and ion composition in the produced fluid of this block were measured. The test results are shown in Table 1. Using the method of the present invention to block GN 11 Implement sand control and increase fluid production in this block.

[0045] Table 1 Block GN 11 Produced fluid performance test results

[0046] parameter Sand content total salinity water type Calciummg / L Magnesiummg / L Ferrous mg / L Potassium mg / L ...

Embodiment 2

[0073] A block B of Shengli Oilfield 43 The reservoir temperature is 55°C, the porosity is 28%, and the average permeability is 2500×10 -3 μm 2 , belonging to unconsolidated sandstone reservoirs, with a shale content of 22%. Before the test, the water content of the block was 88.5%, the daily oil production was 3.5t / d, and the daily liquid production was 60m3 / d. The block B 43 There is a serious problem of sand production, which leads to the phenomenon of low fluid volume and poor productivity in this well. The sand content and ion composition of the produced fluid in this block were measured. The test results are shown in Table 5. Utilize the method of the present invention to block B 43 Implement sand control and increase fluid production in this block.

[0074] Table 5 Block B 43 Produced fluid performance test results

[0075] parameter Sand content total salinity water type Calciummg / L Magnesiummg / L Ferrous mg / L Potassium mg / L value / ...

Embodiment 3

[0102] SH in a block of Shengli Oilfield 18 The reservoir temperature is 65°C, the porosity is 30.2%, and the average permeability is 3500×10 -3 μm 2 , belonging to unconsolidated sandstone reservoirs, with shale content of 29%. Before the test, the water content of the block was 94.5%, the daily oil production was 2.6t / d, and the daily liquid production was 25m 3 / d. There is a serious problem of sand production in this block, which leads to the phenomenon of low fluid volume and poor productivity in this well. The sand content and ion composition in the produced fluid of this block were measured. The test results are shown in Table 9. Using the method of the present invention to block SH 18 Implement sand control and increase fluid production in this block.

[0103] Table 9 Block SH 18 Produced fluid performance test results

[0104] parameter Sand content total salinity water type Calciummg / L Magnesiummg / L Ferrous mg / L Potassium mg / L valu...

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Abstract

The invention belongs to the technical field of microbial oil recovery, and in particular relates to a method for microbial in-situ sand consolidation in unconsolidated sandstone oil reservoirs. The method comprises the following steps: screening of test blocks; preliminary determination of sand-fixing functional microorganisms and their nutrients; preliminary determination of sand-fixing functional microorganisms and their nutrients; preliminary determination of sand-fixing functional microorganisms and their nutrient injection volume; Determination of sand-fixing functional microorganisms and their nutrient injection volume; determination of sand-fixing functional microorganisms and their nutrient injection speed; on-site implementation and effect evaluation. The invention has the advantages of reasonable method, simple process, easy operation, safety and reliability, less investment and low cost; at the same time, the invention can effectively reduce the sand production of unconsolidated sandstone reservoirs, prolong the effective period and increase the liquid production, and the sand production of oil wells The reduction rate of liquid production reaches more than 95%, and the validity period reaches more than 3 years. At the same time, the liquid production of the block increases by more than 100%. Therefore, the field application prospect is broad.

Description

technical field [0001] The invention belongs to the technical field of oil and gas field development, and in particular relates to a microbial in-situ sand-fixing method for unconsolidated sandstone reservoirs. [0002] technical background [0003] At present, most oil fields in my country belong to sandstone reservoirs, and the common feature is serious sand production, especially unconsolidated sandstone reservoirs. The cementation strength of the formation rock in this type of reservoir is not enough, and it is easy to produce sand in the oil well under the condition of fluid erosion. At the same time, if the crude oil has high viscosity and strong sand-carrying ability, serious sand production is likely to occur in this case, which may easily cause sand stuck or sand buried in the oil well. The safe and efficient production of oil wells brings great harm. [0004] At present, the sand control technology mainly includes: screen gravel packing, sand filter tube, and chem...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/02E21B43/22
CPCE21B43/025E21B43/16
Inventor 束青林宋欣胡婧林军章张吉星巴燕刘方于丹丹王冠李彩风
Owner CHINA PETROLEUM & CHEM CORP
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