Method for improving CO2 miscible flooding recovery efficiency
A miscible flooding and CO2 technology, applied in chemical instruments and methods, production fluids, earth drilling and production, etc., can solve the problems of small miscible flooding area, unsatisfactory effect, and difficulty in water injection in ultra-low permeability reservoirs
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Examples
Example Embodiment
[0031] Embodiment 1 A kind of improving CO 2 The method of miscible flood recovery
[0032] Formation permeability of A oilfield is 0.5×10 -3 μm 2 , the original formation pressure is 45MPa, the formation temperature is 80℃, and the formation oil and CO are tested experimentally. 2 The miscible pressure is 28MPa, the formation water sensitivity is serious, and it is difficult to inject water. The production well produces 2 tons of fluid per day, 1.8 tons of oil per day, and water content of 10%. It is designed to carry out CO 2 Miscible flooding, CO injection per day 2 30 tons / day, CO added 2 Amount of 1% CO 2 Miscible profile control agent TH-1, continuous injection until CO 2 The miscible flooding ends, and the CO is designed to be injected 2 50,000 tons, and 500 tons of miscible profile control agent TH-1.
[0033] The composition of the TH-1 is 20% sodium 2-ethylhexyl succinate sulfonate, 15% fatty alcohol polyoxyethylene ether sodium sulfate, 10% Span-80, 30% ethan...
Example Embodiment
[0034] Embodiment 2 a kind of increase CO 2 The method of miscible flood recovery
[0035] The formation permeability of B oilfield is 1.0×10 -3 μm 2 , the original formation pressure is 40MPa, the formation temperature is 75℃, and the formation oil and CO are tested experimentally. 2 Miscible pressure 26MPa, injection well water 10m per day 3 , the injection pressure is 28MPa, the daily liquid production of the production well is 3 tons, the daily oil production is 2.85 tons, and the water content is 5%. 2 Miscible flooding, CO injection per day 2 40 tons / day, CO added 2 Amount of 0.5% CO 2 Miscible profile control agent TH-2, intermittent injection of miscible agent TH-2, plus miscible agent and simple injection of CO 2 Time 1:1, alternating every 30 days, designed to inject CO 2 80,000 tons, and inject 200 tons of miscible profile control agent TH-2.
[0036] The composition of TH-2 is 15% sodium 2-ethylhexyl succinate sulfonate, 10% fatty alcohol polyoxyethylene ...
Example Embodiment
[0037] Embodiment 3 A kind of improving CO 2 The method of miscible flood recovery
[0038] The formation permeability of C oilfield is 0.2×10 -3 μm 2 , the original formation pressure is 42MPa, the formation temperature is 85℃, and the formation oil and CO are tested experimentally. 2 The miscible pressure is 32MPa, it is difficult to inject water, the daily production of the production well is 1 ton, the daily oil production is 0.8 ton, the water content is 20%, and it is designed for CO 2 Miscible flooding, CO injection per day 2 20 tons / day, CO added 2 Amount of 1% CO 2 Miscible profile control agent TH-3, continuous injection until CO 2 The miscible flooding ends, and the CO is designed to be injected 2 30,000 tons, inject 300 tons of miscible profile control agent TH-3.
[0039] The composition of TH-3 is sodium 2-ethylhexyl succinate sulfonate 20%, cocamidopropyl betaine 10%, butyl acetate 10%, ethyl acetate 10%, Span-80 10%, Ethanol 40%. Indoor test CO 2 Th...
PUM
Property | Measurement | Unit |
---|---|---|
Permeability | aaaaa | aaaaa |
Viscosity | aaaaa | aaaaa |
Viscosity | aaaaa | aaaaa |
Abstract
Description
Claims
Application Information
- R&D Engineer
- R&D Manager
- IP Professional
- Industry Leading Data Capabilities
- Powerful AI technology
- Patent DNA Extraction
Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.
© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap