Microbial in-situ sand consolidation method for loose sandstone reservoir

A technology for sandstone reservoirs and microorganisms, which is applied in earthwork drilling, production fluids, wellbore/well components, etc., to achieve the effects of reducing sand production, increasing liquid production, and facilitating field promotion and application

Active Publication Date: 2020-01-03
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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  • Microbial in-situ sand consolidation method for loose sandstone reservoir
  • Microbial in-situ sand consolidation method for loose sandstone reservoir
  • Microbial in-situ sand consolidation method for loose sandstone reservoir

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 microbial in-situ sand consolidation method for a loose sandstone reservoir. The method comprisesthe following steps: screening a test block; preliminarily determining sand consolidation functional microorganisms and nutrients thereof; preliminarily determining sand consolidation functional microorganisms and nutrients thereof; preliminarily determining sand consolidation functional microorganisms and the injection amount of nutrients thereof; determining sand consolidation functional microorganisms and the injection amount of nutrients thereof; determining sand consolidation functional microorganisms and the injection rate of nutrients thereof; and carrying out on-site implementation and effect evaluation. The microbial in-situ sand consolidation method has the advantages of being reasonable, simple in process, easy to operate, safe and reliable, few in input and low in cost. Meanwhile, the sand production rate of the loose sandstone reservoir can be reduced effectively, the period of validity is prolonged and the liquid production capacity is improved, the sand production rateof an oil well is reduced by over 95%, the period of validity is over 3 years, and meanwhile, the liquid production capacity of the block is improved by over 100%. Therefore, the microbial in-situ sand consolidation method has a wide on-site application prospect.

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 Applications(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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