Diversion acidizing experimental apparatus suitable for multiple permeability max-min ratios and evaluation method

Abstract

The invention provides a diversion acidizing experimental apparatus suitable for multiple permeability max-min ratios and an evaluation method. The experimental apparatus comprises an injection system, a rock core clamping device, a simulation system, a metering system, and a data acquiring and processing system, wherein the injection system comprises a plurality of working solution storage devices which are arranged in parallel and an injection pipeline; an injection pump and a valve are arranged on the injection pipeline; the rock core clamping device comprises a plurality of rock core clampers which are arranged in a thermostat in parallel; the simulation system comprises a working solution flow control device, a temperature control device and an environment pressure control device; the metering system comprises a pressure sensor, a temperature sensor and an electronic scale; the data acquiring and processing system comprises a man-machine interaction device, a data processor and an execution unit. The diversion acidizing experimental apparatus can meet synchronous experiment demand of multiple rock cores, is particularly suitable for a long well-section diversion acidizing experiment or a temporary blocking steering acidizing experiment with strong anisotropism and large permeability max-min ratio, has the advantages of strong comparison of experimental conditions and results and high experimental efficiency on fracturing liquid optimization and reservoir sensitivity evaluation, and has wide application prospect.

Description

technical field [0001] The invention relates to the fields of optimized design for oil and gas field development and optimization of acid liquid, in particular to a special device and an evaluation method for evaluating diversion effects in the acidizing process of oil and gas fields. Background technique [0002] Horizontal well technology has been more and more widely used in oil and gas fields all over the world (including drilling horizontal wells in carbonate rocks for development) because it can greatly improve the stimulation effect and oil and gas reservoir recovery. However, horizontal wells are difficult to achieve targeted stimulation due to long well intervals, fast acid-rock reaction and fluid loss. The possible result of conventional acidizing is that the low-porosity and low-permeability zone that needs more stimulation does not get enough acid and the stimulation effect is poor, while the medium-high porosity and micro-fracture development zone that only nee...

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Problems solved by technology

[0003] Conventional acidizing experimental devices are usually designed with only one core holder, which can only be used for single core flow experiments. However, it is difficult to ensure that the pump

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