Tertiary oil recovery method for oil displacement between single-well huff-puff sections of tight oil shale oil horizontal well

Abstract

The invention discloses a tertiary oil recovery method for oil displacement between single-well huff-puff sections of a tight oil shale oil horizontal well. The tertiary oil recovery method comprises the following steps that measure wells meeting the requirements are screened out according to preset standards; target layer sections capable of conducting tertiary oil recovery construction are selected from the measure wells; reservoir parameters and perforation parameters of the target layer sections are obtained, so that the target layer sections are divided into a plurality of sets of swallowing sections and spitting sections; injection liquid containing a microbial oil displacement agent is injected into all the swallowing sections, and well soaking is conducted for a period of time; and after well soaking is finished, oil-water mixtures obtained through replacement of the injection liquid are extracted from all the spitting sections. According to the technical scheme, the tertiary oil recovery method has the following beneficial effects that the injection liquid containing the microbial oil displacement agent is injected from the swallowing sections, crude oil obtained through replacement and displacement is made to move towards the spitting sections, the sweep range of the microbial oil displacement agent is greatly widened, remaining oil areas of near-well zones and far-well zones are communicated, the oil-water interfacial tension and the crude oil viscosity are reduced, and the yield increasing effect of tertiary oil recovery is achieved.

Description

technical field [0001] The invention relates to the technical field of tertiary oil recovery, in particular to a tertiary oil recovery method for oil displacement between huff and puff sections of a single well of a tight oil shale oil horizontal well. Background technique [0002] At present, both conventional vertical wells and unconventional horizontal wells in tight oil reservoirs at home and abroad generate new fractures through fracturing, so as to establish new oil and gas seepage channels and change the fluid seepage and displacement laws of oil and gas layers, and achieve effective single well stimulation. Volume, in order to obtain a better harvesting effect. But in the later stage of development, the natural energy of the reservoir is depleted, and the energy of the reservoir decreases rapidly, resulting in a decrease in the liquid supply capacity of the reservoir, a decrease in the production pressure difference, a rapid decline in production, and a low final pro...

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Problems solved by technology

[0011] In view of this, it is necessary to provide an tertiary oil recovery method for oil displacement between the huff and puff intervals of a single well in a tight oil shale oil horizontal well, to solve the problems of long construction period, complicated construction process, and multiple The technical problems of shutting down the well after opening the second time, the oil-displacing agent sweeping range is small, and the water locking effect and water channeling phenomenon are easy to occur

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