Full-diameter shale reservoir core bedding fracture hydration strength experimental evaluation method

Abstract

The invention discloses a full-diameter shale reservoir core bedding fracture hydration strength experimental evaluation method and belongs to the field of unconventional oil and gas exploration. Themethod is characterized by comprising the following steps that: a, a full-diameter rock core is selected; b, the full-diameter rock core is drilled along an axial direction; c, a stainless steel pumping liquid pipe sleeved with a sealing rubber sleeve is arranged into a hole; d, annulus pressurization is performed on the stainless steel liquid pumping pipe and the sealing rubber sleeve; e, vertical pressure and confining pressure are applied to the rock core simultaneously; f, liquid is injected into the stainless steel liquid pumping pipe, and a tracking pump is started to monitor pumping pressure; g, whether an experiment is to be terminated or experiment parameters are to be changed is determined; h, the rock core is taken out; i, the vertical pressure or confining pressure is changed;j, after the stainless steel pumping liquid pipe is lifted multiple times, pumping injection pressure change and pumping injection quantities monitored by the tracking pump are obtained in unit time;and k, the hydration strength of the rock core is evaluated through a gas flow ratio. With the method adopted, shale gas reservoir hydration characteristics can be deeply understood; shale reservoir yield increase transformation theories are enriched; and shale reservoir yield increase is facilitated.

Description

technical field [0001] The invention relates to the field of unconventional oil and gas exploration, in particular to an experimental evaluation method for the hydration strength of bedding fractures in full-diameter shale reservoir cores. Background technique [0002] Hydraulic fracturing technology is a key technology for exploiting shale gas, and the complexity of the fracturing fracture network is one of the important indicators of the stimulation effect of shale reservoirs. Understand the hydration characteristics of shale gas reservoirs, clarify the essential differences between shale gas reservoirs and conventional sandstone reservoirs, including but not limited to the basic physical properties of rock mechanics, mineral components under different geological conditions, reservoir core pores-fractures The structure, development of bedding fractures, and reservoir core hydration characteristics are important prerequisites for improving the theory and technology of shale...

AI Technical Summary

Problems solved by technology

However, due to the change of the contact area between the rock pillar and the liquid and the influence of the overlying stratum and tectonic stress on the hydration intensity and law, it is impossible to deeply understand the hydration characteristics of shale gas reservoirs, and to clarify the relationship between shale gas reservoirs and conventional hydration. Sandstone reservoirs are essentially different, so they cannot enrich the theory of shale reservoir stimulation and transformation, which is not conducive to shale reservoir stimulation

Images