Selective water plugging agent and method for long-term oil stabilization and water control in oil and gas fields with high temperature and high pressure resistance

Abstract

The invention relates to a selective water plugging agent and a high temperature, high pressure and long-term oil stabilization and water control method for oil and gas fields. The total weight is 100% and is prepared from the following raw materials: cement: 35.0-75.0%; modifier: 0.5% ~15.0%; pore-forming agent: 0.5-7.0%; admixture: 0.5-8.0%; cosolvent: 1.0-15.0%; the balance is water. The invention has strong oil stabilization and water control characteristics, can effectively reduce the water phase permeability, has little effect on the oil phase permeability, and can adjust the curing time. It has a wide range of applications; the preparation process is simple, and it is formed by simple compounding, without the need for polymerization reaction and cross-linking reaction; the production cost is low, and the follow-up processing cost can be reduced at the same time.

Description

technical field [0001] The invention relates to a selective water blocking agent and a high temperature, high pressure and long-acting oil stabilization and water control method for oil and gas fields, belonging to the technical field of oil field chemistry. Background technique [0002] In the later stage of the oilfield exploitation process, the oil has been flooded for many times, and the formation water or injected water has been continuously developed due to the uneven geology and the difference of oil-water mobility ratio. The recovery factor of the reservoir has decreased, especially in the offshore oil field, the post-processing cost has increased significantly due to the increase in the water content in the produced fluid. At present, the most widely adopted measure for oil wells in response to this situation is water plugging technology. Commonly used is the use of chemical water plugging agents, which are injected into the aquifer through coiled tubing to achieve...

AI Technical Summary

Problems solved by technology

[0005] In view of the above technical problems, the present invention provides a selective water shutoff agent and a high temperature and high pressure long-term stable oil and water control method for oil and gas fields, which overcomes the shortcomings of the selective water shutoff method and water shutoff agent in the prior art, and can be injected near oil wells Reservoirs with pore-throat diameters greater than 20 μm, regardless of oil layers and water layers, have good oil-water separation ability after injection and solidification. Crude oil can pass through but only a small amount of water can pass through, so as to stabilize oil and control water. It also has the function of sand control and reduces the cost of follow-up treatment

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