An experimental evaluation method for hydration strength of bedding fractures in full-diameter shale reservoir cores

Abstract

The invention discloses an experimental evaluation method for hydration strength of bedding fractures in full-diameter shale reservoir cores, which belongs to the field of unconventional oil and gas exploration, and is characterized in that it comprises the following steps: a. selecting a full-diameter core; b. axially Drilling; c. Put the stainless steel pump liquid pipe covered with sealing rubber sleeve into the hole; d. Pressurize the annular space between the stainless steel pump liquid pipe and the sealing rubber sleeve; e. Apply vertical pressure and confining pressure to the core at the same time; f , Inject liquid into the stainless steel pump liquid pipe, turn on the tracking pump to monitor the pump injection pressure; g, determine whether to end the experiment or change the experimental parameters; h, take out the core; i, change the vertical pressure or confining pressure; j, lift the stainless steel multiple times After pumping the liquid pipe, track the pump injection pressure change and the pump injection volume monitored by the pump per unit time; k. Evaluate the hydration intensity of the core through the gas flow ratio. The invention can deeply understand the hydration characteristics of shale gas reservoirs, enrich the theory of shale reservoir stimulation and transformation, and is beneficial to the production stimulation of shale reservoirs.

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

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