An experimental device and evaluation method for acidification adapting to multi-permeability level differential flow

Abstract

The invention provides a multi-permeability level differential flow acidification experimental device and evaluation method. The experimental device includes: the injection system includes several parallel-connected working fluid storage devices and injection pipelines, and injection pumps and valves are arranged on the injection pipelines; The holding device is set in a constant temperature box and several core holders are set in parallel; the simulation system includes a working fluid flow control device, a temperature control device and a ring pressure control device; the metering system includes a pressure sensor, a temperature sensor and an electronic balance; the data The acquisition and processing system includes a human-computer interaction device, a data processor and an execution unit. The invention can meet the needs of multiple core experiments at the same time, and is especially suitable for diversion acidification or temporary plugging diversion acidification experiments in long well sections with strong heterogeneity and large permeability gradients. It is used in fracturing fluid optimization and reservoir sensitivity evaluation It shows the advantages of strong contrast between experimental conditions and results, high experimental efficiency, and broad application prospects.

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...

AI Technical Summary

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 pumping pressure and flow conditions of the previous experiments are consistent with those of the previous experiments, and the results are not comparable. Shift to Acidification Experimental Evaluation Needs

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