Three-phase foam complex oil flooding system and application thereof
A composite flooding system technology, applied in the direction of production fluid, drilling composition, wellbore/well components, etc., can solve the problems of limited application, single gas, etc., to improve the sweep coefficient, reduce the oil-water mobility ratio, good stability effect
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
Embodiment 1
[0049] Example 1: Three-phase foam composite oil displacement system, which is composed of oil displacement system solution and nitrogen at a volume ratio of 1:1, which are injected into formations or cores alternately in sequence.
[0050] Oil displacement system solution: foaming agent is tetradecyl hydroxysulfobetaine surfactant (THSB), and the percentage of foaming agent accounting for total oil displacement system solution mass is 0.2%; Foam stabilizer is made of nonionic polyacrylamide It is composed of phenolic resin jelly dispersion 1:1, wherein the molecular weight of non-ionic polyacrylamide is 6 million, the degree of hydrolysis is 2%, the size of the jelly dispersion is 50-60 μm, and the foam stabilizer accounts for the mass percentage of the total oil displacement system solution 0.2%; the rest is water.
[0051] The above oil displacement system solution is abbreviated as: 0.2%THSB+0.1%NPAM+0.1%DPG+residual water, the same expression is also used in the following...
Embodiment 2
[0059] As described in Example 1, the difference is: the length × width × height of the basic parameters of the three-layer heterogeneous core = 30cm×4.5cm×4.5cm, and the permeability of the high, middle and low layers is 5 μm, 2 μm, 0.5 μm. Oil flooding results: the water flooding recovery rate is 43.6%, the ultimate recovery rate after three-phase foam composite flooding reaches 89.6%, and the enhanced oil recovery rate is 46.0%.
Embodiment 3
[0061] As described in Example 1, the difference is: the injection slug is the first 0.15PV oil displacement system solution, followed by alternate injection of 0.15PV nitrogen gas (2 times); the oil displacement result: the water flooding recovery rate is 37.0%, three-phase After foam composite flooding, the ultimate recovery rate reaches 70.1%, and the enhanced oil recovery rate reaches 33.1%.
PUM
Property | Measurement | Unit |
---|---|---|
size | aaaaa | aaaaa |
particle size | 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, Popular Technical Reports.
© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com