Foam reinforcing polymer oil displacement agent and method

Abstract

The invention provides a foam reinforcing polymer oil displacement agent which comprises a component A and a solvent B, wherein the component A comprises the following components in percentage by weight: 0.1-0.18 percent of surfactant, 0.15-0.25 percent of polymer, 7.5-9 percent of decomposition and gas production substance or / and gas production substances a and the balance of water; the solvent B comprises the following components in percentage by weight: 15-25 percent of gas production substance b and the balance of water; the decomposition and gas production substance is decomposed under astratum condition to produce CO2 or / and N2; the gas production substances a and the gas production substance b can react to generate CO2 or / and N2; and decomposition products do not react with the gas production substance a. The invention also provides a foam reinforcing polymer oil displacement method. The foam reinforcing polymer oil displacement agent can be used for forming foam under the stratum condition through reaction by utilizing the gas production substances, and the generated foam is stable and uniformly distributed, thereby the recovery ratio of the crude oil is improved.

Description

Technical field [0001] The invention relates to tertiary oil recovery technology in oil fields, in particular to a foam-reinforced polymer oil-displacing agent and a method for using the foam-reinforced polymer oil-displacing agent to drive oil. Background technique [0002] At present, many domestic oilfields are in the stage of high water cut and high recovery degree, with low comprehensive recovery rate, multiple wells and low production. In the 1980s, my country developed chemical flooding tertiary oil recovery technology. Tertiary oil recovery is compared to primary oil recovery and secondary oil recovery. In the early stage of oil exploitation, only the natural energy of the formation is used to extract oil as primary oil recovery, and the recovery rate is only about 10%; the method of extracting oil by injecting water and gas into the formation is secondary oil recovery, and the recovery rate is generally only Reach about 25% to 40%; tertiary oil recovery uses physical, ...

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Problems solved by technology

[0005] However, most of the foams in the foam flooding agents used in oil fields are prepared on the ground from gas and solution, or by means of the agitation of bottom-hole gas and the addition of surfactants to make the bottom-hole fluid into foam and bubbles. Poor stability, uneven distribution in the formation, greatly restricted in field application

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