Sand consolidation by enzyme mediated calcium carbonate precipitation

    公开(公告)号:US11535791B2

    公开(公告)日:2022-12-27

    申请号:US17200031

    申请日:2021-03-12

    Abstract: Methods for treating a formation may include introducing components of a treatment solution into a wellbore such that the treatment solution contacts the formation to be treated, where the treatment solution may include urea, urease, a calcium ion source, one or more polysaccharides, a casein protein, a protease, an ionic compound, and a sugar, where the formation may have an amount of sand production before treatment and may be in fluid contact with the wellbore, and where an amount of sand production after treatment may be less than the amount of sand production before treatment. Consolidated sand structure compositions may include previously unconsolidated sand interlinked by inter-particle cementitious bonds comprising deposited calcium carbonate crystals, where the consolidated sand has a structural strength and the consolidated sand structure is porous to permit fluid flow through the composition.

    NITRATE TREATMENT FOR INJECTIVITY IMPROVEMENT

    公开(公告)号:US20230287773A1

    公开(公告)日:2023-09-14

    申请号:US17654646

    申请日:2022-03-14

    CPC classification number: E21B43/20 C09K8/605

    Abstract: Methods of enhancing water injectivity into a subterranean wellbore may include injecting a first composition comprising nitrate anions having a nitrate concentration into a target zone of the subterranean wellbore; injecting a second composition comprising nitrate anions into the target zone of the subterranean wellbore, where the second composition has a nitrate concentration of from about 20% to about 70% the nitrate concentration of the first composition; optionally injecting a third composition comprising nitrate anions into the target zone of the subterranean wellbore, where the third composition has a nitrate concentration of from about 20% to about 70% the nitrate concentration of the second composition; and injecting water, where the water injection pressure is reduced by about 5% to 25% compared to the water injection pressure in an untreated subterranean wellbore, where the nitrate anions are reduced by bacteria present in the subterranean wellbore.

    Sand consolidation by enzyme mediated calcium carbonate precipitation

    公开(公告)号:US11970659B2

    公开(公告)日:2024-04-30

    申请号:US18061353

    申请日:2022-12-02

    CPC classification number: C09K8/5758 C09K8/5045 C09K8/514 C09K8/572 E21B43/025

    Abstract: Methods for treating a formation may include introducing components of a treatment solution into a wellbore such that the treatment solution contacts the formation to be treated, where the treatment solution may include urea, urease, a calcium ion source, one or more polysaccharides, a casein protein, a protease, an ionic compound, and a sugar, where the formation may have an amount of sand production before treatment and may be in fluid contact with the wellbore, and where an amount of sand production after treatment may be less than the amount of sand production before treatment. Consolidated sand structure compositions may include previously unconsolidated sand interlinked by inter-particle cementitious bonds comprising deposited calcium carbonate crystals, where the consolidated sand has a structural strength and the consolidated sand structure is porous to permit fluid flow through the composition.

    Nitrate treatment for injectivity improvement

    公开(公告)号:US11732560B1

    公开(公告)日:2023-08-22

    申请号:US17654646

    申请日:2022-03-14

    CPC classification number: E21B43/20 C09K8/605

    Abstract: Methods of enhancing water injectivity into a subterranean wellbore may include injecting a first composition comprising nitrate anions having a nitrate concentration into a target zone of the subterranean wellbore; injecting a second composition comprising nitrate anions into the target zone of the subterranean wellbore, where the second composition has a nitrate concentration of from about 20% to about 70% the nitrate concentration of the first composition; optionally injecting a third composition comprising nitrate anions into the target zone of the subterranean wellbore, where the third composition has a nitrate concentration of from about 20% to about 70% the nitrate concentration of the second composition; and injecting water, where the water injection pressure is reduced by about 5% to 25% compared to the water injection pressure in an untreated subterranean wellbore, where the nitrate anions are reduced by bacteria present in the subterranean wellbore.

    SAND CONSOLIDATION BY ENZYME MEDIATED
CALCIUM CARBONATE PRECIPITATION

    公开(公告)号:US20230096777A1

    公开(公告)日:2023-03-30

    申请号:US18061353

    申请日:2022-12-02

    Abstract: Methods for treating a formation may include introducing components of a treatment solution into a wellbore such that the treatment solution contacts the formation to be treated, where the treatment solution may include urea, urease, a calcium ion source, one or more polysaccharides, a casein protein, a protease, an ionic compound, and a sugar, where the formation may have an amount of sand production before treatment and may be in fluid contact with the wellbore, and where an amount of sand production after treatment may be less than the amount of sand production before treatment. Consolidated sand structure compositions may include previously unconsolidated sand interlinked by inter-particle cementitious bonds comprising deposited calcium carbonate crystals, where the consolidated sand has a structural strength and the consolidated sand structure is porous to permit fluid flow through the composition.

    SYSTEMS AND METHODS FOR TESTING BIOCIDE

    公开(公告)号:US20220009805A1

    公开(公告)日:2022-01-13

    申请号:US16926963

    申请日:2020-07-13

    Abstract: A biocide testing system includes test columns, a bypass tube, control valves, and a control system. Each test column includes biocide test coupons. The bypass tube is fluidly coupled to each of the test columns. Each control valve is coupled between a respective test column and the bypass tube. The control system performs operations including: controlling the control valves to fluidly couple the test columns to a water source; controlling a pump to circulate water from the water source into the test columns to immerse each test coupon in water; controlling the control valves to fluidly isolate the test columns from the water source and to fluidly isolate each test column from the other test columns; controlling a particular control valve to fluidly couple a particular test column to a biocide source; and controlling the pump to circulate biocide from the biocide source into the particular test column to immerse the test coupons in the particular test column in biocide.

    BIO-TAR MITIGATION IN AQUIFER OR WATER INJECTORS WELLS

    公开(公告)号:US20250122420A1

    公开(公告)日:2025-04-17

    申请号:US18485482

    申请日:2023-10-12

    Abstract: Described is a method for mitigating tar in a reservoir. Tar-mitigating bacteria is introduced downhole to a reservoir with tar. The tar-mitigating bacteria are delivered to a tar food source in the reservoir, triggering bacterial growth upon reaching the tar food source. The tar breaks apart, allowing the tar-mitigating bacteria to produce and release biosurfactants, thereby trapping the tar from the reservoir with the biosurfactants. The tar trapped by the biosurfactants is mobilized away from porous rock, and the trapped tar is removed from the reservoir.

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