Method for analyzing yields of cyclic gas injection wells of shale oil reservoir and application thereof

Abstract

The invention belongs to the technical field of simulation of shale oil reservoir development, and relates to method for analyzing yields of cyclic gas injection wells of shale oil reservoir and an application thereof. The method for analyzing yields of cyclic gas injection wells of shale oil reservoir comprises the following steps of: establishing a shale oil reservoir phase state theoretical model; establishing an oil reservoir model; obtaining production history data of an oil reservoir; combining the shale oil reservoir phase state theoretical model and the oil reservoir model to carry outsimulative calculation on influence factors of a well yield by utilizing a numerical simulation technology, wherein the influence factors comprise capillary force effect, molecular diffusion effect,cyclic period and the like; and respectively determining influences, on a recovery ratio, of each factor under different numerical values through comparing the simulative calculation result, and analyzing or evaluating an influence degree, on improving the well yield via cyclic gas injection, of each factor. According to the method, the problem that the reservoir oil displacement process of shaleoil reservoir cyclic gas injection and particularly cyclic CH4 injection is lack of systematic study in the prior art is relieved.

Description

technical field [0001] The invention belongs to the simulation technical field of shale oil reservoir development, in particular to a shale oil reservoir circulation gas injection oil well production analysis method and application thereof. Background technique [0002] With the increasingly prominent contradiction between the world's oil supply and demand, the gradual shortage of high-quality oil resources, the massive exploitation of conventional oil reservoirs, and the continuous development of oil and gas exploration and development, unconventional oil and gas resources have become important oil and gas resource replacement areas. For example, unconventional oil and gas resources such as shale oil, shale gas, tight gas, and coalbed methane have shown huge potential for exploration and development, and have gradually become the highlight of global oil and gas exploration and development. [0003] In recent years, due to the advancement of horizontal well drilling technolo...

AI Technical Summary

Problems solved by technology

Yu et al. (2014) discussed the influence of CO 2 important parameters of the huff and puff process, but they ignore the capillary force effect in tight reservoirs

Chen and Gu (2017) used sensitivity analysis to demonstrate the relationship between initial depletion production time, injection time, and production time; 2 Diffusion phenomenon

[0005] At present, cyclic gas injection in shale reservoirs (especially cyclic CH injection) 4 ) of the oil displacement process is seldom studied, which has certain limitations and lacks of systematic research, resulting in unsatisfactory production stimulation effect

Images