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
CN110644953AActive Publication Date: 2020-01-03CHINA PETROLEUM & CHEM CORP +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHINA PETROLEUM & CHEM CORP
Publication Date
2020-01-03

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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.
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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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