Abrasive jet slit test bench under confining pressure

Abstract

An abrasive jet slit test bench under confining pressure. The test bench includes a pressurization device, a water supply device, a particle storage device, a particle injection device and a confining pressure cutting device; the booster device includes a high-pressure pump and a high-pressure pipeline, and the particle storage device includes a large water tank, a small water pump, and a small water tank And the filter screen, the screw propeller includes a high-pressure particle storage tank, a pressure gauge and a high-pressure hose, the particle injection device includes a pipeline and a No. 1 stepper motor, and the confining pressure cutting device includes a high-pressure sealed shell, a cutting head, Guide rails, sliders, lead screws, support frames, O-rings, throttling pipelines, and No. 2 stepping motors. This kind of test bench can simulate the cutting environment of the abrasive jet in the subsea well, can measure the relationship between the time when the abrasive jet penetrates the casing and the velocity of the abrasive jet, and can also analyze the performance parameters of the casing after cutting. A reliable experimental device is provided to analyze the cutting condition of the abrasive jet cutting the casing downhole and related influencing factors.

Description

Technical field: [0001] The invention relates to a test device in the field of natural gas hydrate exploitation, in particular to an abrasive jet slit test bench under confining pressure conditions. Background technique: [0002] Abrasive jet technology is an emerging processing technology, which has been successfully applied in many fields. In the process of oil and gas hydrate exploitation, it is necessary to use abrasive jet to cut the casing and cut the formation at the same time, so as to achieve the realization of oil and gas hydrate and The connection of the casing can realize the exploitation of resources through the follow-up process. Since the natural gas hydrate is buried in the seabed formation, the abrasive jet cutting casing is also completed in the seabed formation, so when the abrasive jet can penetrate the casing under the influence of the seabed pressure, the distance to cut the formation after the breakdown, and And the changes in the process parameters a...

AI Technical Summary

Problems solved by technology

Since the natural gas hydrate is buried in the seabed formation, the abrasive jet cutting casing is also completed in the seabed formation, so when the abrasive jet can penetrate the casing under the influence of the seabed pressure, the distance to cut the formation after the breakdown, and And the changes in the process parameters and mechanical properties of the casing after cutting are unknown. At present, most of the theory and experiments of abrasive jet technology are carried out under the condition of no confining pressure, so it is difficult to analyze the above cutting conditions. , by consulting articles on abrasive jet rock breaking and jet cutting other materials, we can know that factors such as pressure, jet velocity, target distance, particle concentration, nozzle shape, particle diameter, nozzle diameter and confining pressure will affect the cutting effect of abrasive jet

Therefore, there are many factors that affect the cutting effect of abrasive jets. It is difficult to apply a single experiment to other situations. It can only be used as a reference. Different cutting situations should be explained by corresponding experiments and theories.

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