Chromium-aluminum ion compound profile control agent for highly permeable duct type oil deposit and use method thereof
A profile control agent and oil reservoir technology, applied in chemical instruments and methods, earthwork drilling and production, and drilling compositions, etc., can solve problems that are difficult to adapt to the complexity of reservoirs, reduce the sweep efficiency of injected water, and low water flooding sweep efficiency To achieve the effects of inhibiting the formation of dead oil zones, prolonging the gel breaking time, and increasing the sweep coefficient of water flooding
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Embodiment 1
[0036] 1. The method of using the profile control agent: (1) First, carry out oxygen exposure treatment on the prepared water to reduce the dissolved oxygen content in the prepared water to less than 3 mg / L; (2) Add part of the hydrolysis polymer to the prepared water at a temperature of 15°C Acrylamide was stirred at a constant speed for 2 hours, then the additive was added to the prepared water and stirred at a constant speed for 3 hours to obtain the profile control agent; (3) After the preparation was completed, the profile control agent was directly injected into the rock core.
[0037] 2. Prepare water, adjust the salinity to 500mg / L by adding NaCl to the distilled water, so as to simulate the source water used in production.
[0038] 3. The specific application dosage is:
[0039] Slug A: The composite polymer is composed of three kinds of partially hydrolyzed polyacrylamide with different molecular weights, the molecular weights are 1200*10 4 、1800*10 4 、2400*10 4 ,...
Embodiment 2
[0065] 1. The method of using the profile control agent: (1) First, carry out oxygen exposure treatment on the prepared water to reduce the dissolved oxygen content in the prepared water to less than 3mg / L; (2) Add part of the hydrolytic polymer to the prepared water at a temperature of 35°C Acrylamide was stirred at a constant speed for 2.5 hours, then the additive was added to the prepared water and stirred at a constant speed for 2.5 hours to obtain the profile control agent; (3) After the preparation was completed, the profile control agent was directly injected into the rock core.
[0066] 2. Prepare water, adjust the salinity to 8000mg / L by adding NaCl to the distilled water, to simulate the oil field sewage used in actual production.
[0067] 3. The specific application dosage is:
[0068] Slug A: The composite polymer is composed of three kinds of partially hydrolyzed polyacrylamide with different molecular weights, the molecular weights are 1200*10 4 、1800*10 4 、240...
Embodiment 3
[0094] 1. The method of using the profile control agent: (1) Firstly, carry out oxygen exposure treatment on the prepared water to reduce the dissolved oxygen content in the prepared water to below 3 mg / L; (2) add part of the hydrolytic polymer to the prepared water at a temperature of 55°C Acrylamide was stirred at a constant speed for 3 hours, and then the additive was added to the prepared water and stirred at a constant speed for 2 hours to obtain the profile control agent; (3) After the preparation was completed, the profile control agent was directly injected into the rock core.
[0095] 2. To prepare water, adjust the degree of salinity by adding soluble salts to the distilled water, and the final degree of salinity is 35000mg / L, which is used to simulate the oilfield sewage used in actual production.
[0096] 3. The specific application dosage is:
[0097] Slug A: The composite polymer is composed of three kinds of partially hydrolyzed polyacrylamide with different mol...
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