Process of deep profile control over low-permeability oil reservoir
A deep profile control, low permeability technology, applied in the wellbore/well components, drilling composition, production fluid, etc., can solve the problem of high initial viscosity of solution, difficult to low permeability oil reservoir deep profile control, difficult to use profile control agent. Gel formation and other problems, to achieve the effect of improving profile control effect, good expansion capacity, and improving sweep efficiency
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Embodiment 1
[0029] Based on the reservoir data, using the formula It is calculated that the deep profile control amount of the low permeability reservoir is about 1500m 3 , the specific steps of the profile control process are as follows:
[0030] The first step, at a speed of 2m 3 / h injects RD-20 movable jelly profile control agent into the oil layer, and the mass components of the RD-20 movable jelly profile control agent are: 0.2% zwitterionic polymer, 0.2% crosslinking agent A, 0.2% % glue accelerator B, the rest is water; injection volume is 100m 3 .
[0031] The second step is to use RD-20 movable jelly profile control agent to suspend and carry slow-swelling flexible particles. The slow-swelling flexible particles account for 0.5% of the total mass of the system, and the injection volume is 100m 3 .
[0032] The third step, at a speed of 2m 3 / h inject composite particle profile control agent into the oil layer, the mass components of the composite particle profile control ...
Embodiment 2
[0036] Based on the reservoir data, using the formula It is calculated that the deep profile control amount of the low permeability reservoir is about 1800m 3 , the specific steps of the profile control process are as follows:
[0037] The first step, at a speed of 2m 3 / h inject RD-15 movable jelly profile control agent into the oil layer, the mass components of the RD-15 movable jelly profile control agent are: 0.15% zwitterionic polymer, 0.15% crosslinking agent A, 0.15% % glue accelerator B, the rest is water; injection volume is 100m 3 .
[0038] The second step is to use RD-15 movable jelly profile control agent to suspend and carry slow-swelling flexible particles. The slow-swelling flexible particles account for 0.5% of the total mass of the system, and the injection volume is 100m 3 .
[0039] The third step, at a speed of 2m 3 / h inject composite particle profile control agent into the oil layer, the mass components of the composite particle profile control ag...
Embodiment 3
[0043] Based on the reservoir data, using the formula It is calculated that the amount of deep profile control in low permeability reservoirs is about 1000m 3 , the specific steps of the profile control process are as follows:
[0044] The first step, at a speed of 1.5m 3 / h inject RD-25 movable jelly profile control agent into the oil layer, the mass components of the RD-25 movable jelly profile control agent are: 0.25% zwitterionic polymer, 0.25% crosslinking agent A, 0.25% % glue accelerator B, the rest is water; injection volume is 100m 3.
[0045] The second step is to use RD-25 movable jelly profile control agent to suspend and carry slow-swelling flexible particles. The slow-swelling flexible particles account for 0.3% of the total mass of the system, and the injection volume is 100m 3 .
[0046] The third step, at a speed of 2m 3 / h inject composite particle profile control agent into the oil layer, the mass components of the composite particle profile control a...
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