Composite profile control water shutoff agent
A profile control water shutoff agent and composite technology, applied in the direction of drilling composition, chemical instruments and methods, etc., can solve problems such as non-resistance to salt, pump blocking, inconvenient to carry, etc., to reduce construction risks and improve adjustment Dissecting effect, increasing the effect of economic benefits
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Embodiment 1
[0026] Preparation of composite profile control water shutoff agent: Add 7.5Kg polyacrylamide (molecular weight 15 million, hydrolysis degree 25%) into 5m 3 In water, stir evenly; then add 50Kg of pre-crosslinked granular polyacrylate-kaolin composite resin (solid content: 32%), 5Kg of crosslinking agent sodium lactate, and 2Kg of regulator sodium bicarbonate, and stir evenly;
[0027] Injection of profile control water shutoff agent: inject into a water injection well section by section: the first slug is cleaning slug, inject 200m 3 Surfactant lauryl dimethyl betaine (BS-12); inject 1050m in the second slug 3 The prepared composite profile control water shutoff agent; the third slug is injected 300m 3 Inorganic silica gel, where the second slug and the third slug can be injected alternately according to needs; the last injection is 180m 3 Oil displacing agent BS-12 slug. The water injection well injects 1730m of profile control agent according to the prescribed procedure ...
Embodiment 2
[0029] Preparation of composite profile control water shutoff agent: Add 10.5Kg polyacrylamide (molecular weight: 18 million, degree of hydrolysis: 27%) into 5m 3 Surface re-injection water, stir evenly; then add pre-crosslinked granular polyacrylate-kaolin composite resin (solid content: 35%) 100Kg, crosslinking agent chromium lactate 5.5Kg, regulator sodium carbonate 5Kg, and stir evenly;
[0030] Injection of profile control water shutoff agent: inject into a water injection well one by one, the first slug is cleaning slug, inject 100m 3 Surfactant BS-12; inject 850m in the second slug 3 The prepared composite profile control water shutoff agent; the third slug is injected 800m 3 Inorganic silica gel, where the second slug and the third slug can be injected alternately according to needs; the last injection is 270m 3 Oil displacing agent BS-12 slug. The water injection well injects 2020m of profile control agent according to the prescribed procedure 3 Afterwards, the wa...
Embodiment 3
[0032] Preparation of composite profile control water shutoff agent: Add 5Kg polyacrylamide (molecular weight 12 million, hydrolysis degree 20%) into 5m 3 Surface re-injection water, stirring evenly; then add pre-crosslinked granular polyacrylate-bentonite composite resin (solid content: 30%) 25Kg, crosslinking agent chromium lactate 5Kg, regulator sodium bicarbonate 2Kg, and stir evenly;
[0033] Injection of profile control water shutoff agent: inject into a certain water injection well one by one, the first slug is cleaning slug, inject 150m 3 Surfactant BS-12; inject 900m in the second slug 3 The prepared composite profile control water shutoff agent; the third slug is injected 450m 3 Inorganic silica gel, where the second slug and the third slug can be injected alternately according to needs; the last injection is 250m 3 Oil displacing agent BS-12 slug. The water injection well injects 1750m of profile control agent according to the prescribed procedure 3 Afterwards, ...
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