Fracturing oil displacement method for improving the economic efficiency of thin-difference reservoir recovery of an old oil field

Abstract

The invention discloses a fracturing oil displacement method for improving the economic efficiency of thin-difference reservoir recovery of an old oil field. The method is based on oil reservoir evaluation and residual oil description. A fracturing measure process scheme is designed in a targeted manner, and a fine control fracturing technology is adopted the fracturing oil-displacing agent is injected into the stratum at high strength within a short time, the fracturing oil-displacing agent with good fracturing performance and a good displacing and washing effect is used for pressing open thestratum to generate cracks, meanwhile, a large amount of oil permeates into the stratum, the stratum energy is increased, stratum remaining oil can be efficiently displaced and washed, and then the recovery ratio of a thin-difference oil layer is greatly increased. According to the method, reservoir transformation, energy supplementing and chemical flooding washing are combined into a whole, therecovery efficiency can be comprehensively improved, construction parameters and fracturing oil displacement agent performance in fracturing can be reasonably optimized, and fracturing-injection-flooding washing integrated novel technology for improving the recovery ratio, which realizes the organic combination of a reservoir transformation technology and oil reservoir development integration andimproves the economic efficiency of thin-difference reservoir recovery of an old oil field.

Description

technical field [0001] The invention relates to a fracturing oil displacement method for improving the recovery rate of thin and poor reservoirs in old oilfields, in particular to a comprehensive method for improving oil recovery in combination with reservoir reconstruction, energy supplementation and chemical flooding, which belongs to the development of oil and gas fields technology field. Background technique [0002] At present, most of my country's oil production comes from old oil fields. The remaining reserves of old oil fields are quite considerable, and there is huge room for tapping the remaining oil. In the foreseeable future, old oil fields will still be the main force of oil supply. The economical and effective development of mature oilfields that have entered the stage of high recovery and high water cut will become a major challenge for the Chinese petroleum industry. Therefore, continuous exploration of new technologies to improve the recovery of mature oilfi...

AI Technical Summary

Problems solved by technology

The industrial development of thin and poor reservoirs has been explored for many years. Under the current development conditions, the overall production status of thin and poor reservoirs still needs to be improved. A considerable part of thin and poor reservoirs is difficult to effectively develop through traditional secondary oil recovery and tertiary oil recovery technologies.

[0003] Under the action of binary and ternary compound chemical agents in long-term water flooding development, adjusted injection water flushing and chemical flooding enhanced oil recovery technology, the physical property conditions, fluid properties and remaining oil distribution of thin and poor reservoirs in old oilfields have been compared with conventional ones. Reservoirs vary greatly, and the application of EOR technology that has achieved good results in conventional oil reservoirs is limited, and the expected EOR effect cannot be achieved

Reservoir stimulation technologies such as conventional acidizing and fracturing are difficult to implement, the cost of measures is high, and the range of enhanced recovery is limited; the control range of conventional fracturing fractures is limited, and it is difficult to establish an effective displacement relationship between injection and production; It is difficult to control the loss of control, and the fracturing fluid will block or damage the formation, which will affect the effect of the measures; the thin reservoir has strong heterogeneity, large difference in physical properties, high clay content, and the conventional energy supplement method cannot be effective; the microscopic characteristics of the thin reservoir are complex , the radius of the pore throat is small, and it is difficult to develop a suitable high-efficiency flooding agent, and the conventional chemical flooding effect is limited

[0004] In summary, a single conventional enhanced oil recovery technology or a simple combination of several technologies cannot solve the problem of thin and poor reservoirs in old oilfields

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