A double-effect auxiliary heavy oil huff and puff development method for plugging regulation and drainage

Abstract

The invention provides a plugging control and drainage assisting double-effect auxiliary thick oil huff-puff development method. The method includes the following steps that a solid-phase particle water plugging slug is injected into a thick oil well to plug an oil layer; when the injection pressure is increased to 1.0 MPa or above, a foam plug and a nitrogen plug are sequentially injected into the oil well to plug a high-permeability hole channel in the oil layer; when the injection amount of the foam plug reaches the design amount, the foam plug stops being injected, and only the nitrogen plug is injected into the oil well; when the injection amount of nitrogen reaches the design amount, a sealing plug is injected into the oil well to seal the injected nitrogen and foam in the oil layer, and finally steam injection huff-puff production is carried out. By means of the method, stratum energy can be effectively supplemented, gas channeling in the construction process is avoided, an oil layer steam absorption section is adjusted, the swept volume is increased, and the purposes of improving the high-round low-efficiency steam huff-puff well, restoring capacity, increasing the recovery ratio of a thick oil reservoir, prolonging the production period, improving the production level and increasing the oil-steam ratio are achieved.

Description

technical field [0001] The invention relates to a double-effect assisted heavy oil huff and puff development method for plugging regulation and drainage, in particular to a method for improving the steam huff and puff development effect of heavy oil by using nitrogen and other oilfield chemical agents, and belongs to the technical field of heavy oil reservoir development. Background technique [0002] At present, the steam huff and puff thermal recovery technology is the main technology for the development of heavy oil reservoirs at home and abroad. It has the characteristics of simple process, wide application range and high development efficiency. After the steam is injected into the formation, the heat released can effectively reduce the viscosity of the crude oil and improve the flowability of the crude oil. At the same time, the steam can increase the formation pressure and provide energy for driving the crude oil. However, with the deepening of the development process, ...

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Problems solved by technology

[0003] First, the development of steam huff and puff belongs to the depletion type of exploitation. With the continuous extraction of crude oil and groundwater, the formation deficit is serious and the pressure continues to drop, resulting in insufficient development energy;

[0004] Second, some reservoirs have strong heterogeneity, large differences in permeability between layers, uneven production in the vertical direction of the reservoir, large differences in steam absorption intensity of each layer, and even steam overburden or steam channeling problems;

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