Experimental device and experimental method for simulating dynamic leakage and leaking stoppage of drilling fluid

Abstract

The invention belongs to the field of petroleum engineering, and particularly relates to an experimental device and an experimental method for simulating dynamic leakage and leaking stoppage of drilling fluid. The experimental device for simulating the dynamic leakage and leaking stoppage of the drilling fluid comprises a first high-pressure nitrogen bottle, a first circulating cylinder, a leakage test cylinder, a second circulating cylinder, a second high-pressure nitrogen bottle and a servo control injection pump, wherein the first high-pressure nitrogen bottle is connected with the bottom end of the first circulating cylinder; the two ends of a fifth high-pressure pipeline are respectively connected with the upper end of the first circulating cylinder and the upper end of a rock core clamping device; the servo control injection pump is connected with the lower end of the leakage test cylinder; the second high-pressure nitrogen bottle is connected with the bottom end of the second circulating cylinder; the two ends of a fourth high-pressure pipeline are respectively connected with the upper end of the second circulating cylinder and the upper end of the rock core clamping device. According to the experimental device and the experimental method, the positive circulating and positive circulating dynamic leaking stoppage processes of the drilling fluid on the end surfaces of rock cores with different lithological characters in an original crustal stress state can be really simulated; the simulated rock core size is large; the experimental method is simple; the experimental error is small; the experimental device and the experimental method have higher guidance value to field application.

Description

technical field [0001] The invention belongs to the field of petroleum engineering, and in particular relates to an experimental device and an experimental method for simulating the dynamic leakage and plugging of drilling fluid, which are used for the prediction of leakage pressure and the plugging of corresponding plugging agents when oil drilling encounters leaky formations. Leakage effect evaluation. Background technique [0002] The lost circulation problem in the process of oil and gas drilling has always been a major engineering technical problem that plagues oil exploration and development at home and abroad, and has not been completely resolved so far. The wall leakage will not only cause a series of complex situations such as pipe sticking, blowout, and collapse, but also increase the cost of drilling, and also bring great difficulties to the later development. Along with the deep development of oil field, the increase of deep well, ultra-deep well and complex wel...

AI Technical Summary

Problems solved by technology

[0002] The lost circulation problem in the process of oil and gas drilling has always been a major engineering technical problem that plagues oil exploration and development at home and abroad, and has not been completely resolved so far.

For example, the simulated crack plugging test device and test method published by the invention patent application number 200910167764.9 and the high-temperature and high-pressure drilling fluid loss dynamic evaluation instrument published by the invention patent application number 201210023152.4 all use stainless steel plates to simulate cracks, which cannot be used for The simulation of the actual core, and only simulates the static leakage of drilling fluid from the wellbore to the formation, ignoring the flow of the drilling fluid itself in the wellbore; another example, a utility model patent with application number 201220295161.4 discloses a drilling fluid leakage using high temperature and high pressure In the plugging test device, although the circulation system is added to realize the flushing of the plugging layer by drilling fluid, it cannot perform reverse circulation flushing; in addition, none of the above three devices can realize the dynamic leakage of drilling fluid under the stress state, and cannot simulate well Lost Phenomena During Drilling

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