Simulating device for expanding full-diameter core acid wormhole and experimental method

Abstract

The invention discloses a simulating device for expanding a full-diameter core acid wormhole and an experimental method, and belongs to the fields of oil and gas reservoir capacity increasing revamp and oilfield chemistry. The simulating device for expanding the full-diameter core acid wormhole comprises an acid liquor injecting module, an acid liquor circulating module, an injection molding module, a monitoring module and a full-diameter reservoir simulating module. The expansion of the acid wormhole in a full-diameter oil and gas reservoir can be simulated efficiently, simply and conveniently by using the simulating device for expanding the full-diameter core acid wormhole, so that the true environment of a simulated rock stratum can be effectively simulated, and a positive guiding function is provided for mining of oil and gas.

Description

technical field [0001] The invention relates to the field of oil and gas reservoir stimulation and transformation and oilfield chemistry, in particular to a full-diameter rock core acid-etched wormhole expansion simulation device and an experimental method. Background technique [0002] In the development process of carbonate reservoirs, matrix acidizing and acid fracturing are the main stimulation and stimulation methods. Acid fracturing is the process of squeezing acid fluid into fractures and formations, or alternating fracturing fluid and acid, to form fractures and increase the permeability of formations. Matrix acidizing is mainly used to remove plugs near the wellbore. It generates deep-penetrating acid-etched wormholes to form a high conductivity channel connecting the original formation near the wellbore, reducing the skin coefficient and promoting oil and gas production. Furthermore, the accurate characterization of the growth and morphology of acid-etched wormhol...

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Problems solved by technology

[0003] However, judging from the current research status, domestic wormhole simulation devices have more or less deficiencies: (1) Most of the devices are small cores (2.54 cm in diameter), which are all on the pore scale and core scale, and lack relatively large cores. The research on the extension shape of acid-etched wormholes with large diameters (perforation scale and wellbore scale) cannot accurately describe the true law of wormhole growth due to the limited core diameter; The device is a cubic core acid-eroded wormhole expansion radial simulation device, which has poor sealing performance and cannot simulate the real situation of acid-rock reaction under formation pressure

[0004] Existing full-diameter flow experiments can only meet the radial flow of acid liquid, do not have the function of axial flow, and cannot consider the influence of gravity and other engineering geological factors on the dynamic growth of wormholes, and because the flow of acid liquid is limited

The defects of the above-mentioned full-diameter flow experiment make it impossible to form convective diffusion in the pores, and at the same time, it is difficult to filter out the residual acid, which leads to the inability to replenish fresh acid in time, the concentration of the acid solution on the contact surface decreases, and the reaction is controlled by the surface reaction, resulting in surface corrosion. , the degree of automation of the experimental equipment is low, the labor intensity of the experimental personnel is high, and the operation is inconvenient

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