High-temperature and High-Salt resisting gel water packing-off method
A high-temperature-resistant, gel-based technology, which is applied in earthwork drilling, wellbore/well components, sealing/isolation, etc., can solve problems such as oil plugging but not water blocking, low strength, and lack of selective plugging ability. To achieve the effect of improving the success rate and thermal stability
Inactive Publication Date: 2007-01-03
PETROCHINA CO LTD
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The present invention relates to a high-temperature-resistant and high-salt-resistant gel water-plugging method for raising petroleum recovery efficiency. Said invention adopts three-slug injection water-plugging method, and provides the concrete steps of said three-slug injection water-plugging method. These steps are as follows: first slug, adding temporary blocking agent, its added quantity is 10-20% of total injection amount, after the temporary blocking agent is injection for 0.5-1.5 hr, closing well, the temporary blocking agent can be formed into gel, can be used for temporarily blocking the oil layer; then making second slug, injecting low-viscosity gel which is easily injected and can be formed into gel with high viscoelasticity under the condition of stratigraphic temperature, its injected quantity is 70-80% of total injection amount; and third slug, injecting cement as sealing agent, its injected quantity is 10-20% of total injection amount.
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Property | Measurement | Unit |
Water phase permeability | 1.87 | µm² |
Permeability | 0.00008 | µm² |
Breakthrough pressure | 0.048 | MPa/cm |
tensile | MPa | |
Particle size | Pa | |
strength | 10 |
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