Strain gauge pressure test tight oil imbibition experimental device

Abstract

The invention relates to a strain gauge type pressure test tight oil inhibition experimental device, comprising a rock fixture structure and further comprising a control unit. The rock fixture structure can clamp rock containing tight oil and rotate around a horizontal shaft; a horizontal fracturing pipe runs from one side of the rock containing tight oil, one end of the fracturing pipe is connected with a fracturing fluid injection structure, and the fracturing pipe is provided with an inhibition cabin linkage sealing structure; the inhibition cabin linkage sealing structure is provided withmultiple resistance strain gauges; besides, a potential and resistance inhibition test structure is arranged above the rock fixture structure; the control unit can control working status of the fracturing fluid injection structure, the inhibition cabin linkage sealing structure and the potential and resistance inhibition test structure. The device can be used for testing oil and water displacement and oil production effect of fracturing fluid prepared based on different formulas, can analyze pressure propagation speed in inhibition process and oil and water displacement leading-edge position,and has a great significance in optimized evaluation on soaking effect of the fracturing fluid of different formulas.

Description

technical field [0001] The invention relates to the technical field of oil and gas exploitation, in particular to a strain gauge type pressure test tight oil imbibition experimental device. Background technique [0002] Tight oil resources are extremely abundant at home and abroad. Due to the extremely low matrix permeability of tight oil reservoirs, the current mainstream development method at home and abroad relying on the energy depletion of natural formations can only use the crude oil in the vicinity of the fractures communicated by the artificial fracture network, so that the ultimate recovery of the reservoir is the highest It can only reach 3-10%. The use of surfactants to change the wettability of reservoirs to enhance oil recovery has long been used in the development of conventional multi-fractured carbonate reservoirs, in order to improve the wettability of reservoirs by changing the wettability of reservoirs in the process of water injection production. Promot...

AI Technical Summary

Problems solved by technology

But at present, the relevant research on oil displacement in tight reservoirs mainly takes laboratory cores as the research object. For example, invention CN107101925A and invention CN104020098A are small-scale core imbibition experiments. At the same time, if the core is directly soaked in water, it is easy to cause the capillary force to offset, resulting in experimental errors. In addition, the core imbibition experiment makes it difficult to measure the produced crude oil, and the imbibition front cannot be directly observed, nor can it simulate the actual reservoir. The process of pressure osmosis

The core displacement device using nuclear magnetic resonance and other technologies, such as the invention CN106908470A, can realize the occurrence and flow of fluid in the core through nuclear magnetic technology, but the imbibition is a phenomenon that occurs along the direction of capillary force, and the direction of capillary force It is controlled by the microchannel inside the core, so the direction of imbibition can be in any direction, but this invention uses rubber sleeves and adds confining pressure to block the core cylinder, leaving only the end face of the core, which obviously affects the occurrence of imbibition

In summary, using cores to study the integrated process of fracturing, soaking, and imbibition is obviously too small, and the biggest problem with physical simulation through large models is that it is impossible to measure the fluid displaced by imbibition.

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