Underground working condition simulation method for controlled pressure drilling experiment and test

Abstract

The invention relates to an underground working condition simulation method and a device for a controlled pressure drilling experiment and a test, wherein the underground working condition simulation device is connected with controlled pressure drilling equipment in series to perform the experiment and the test. The underground working condition simulation device simulates changes of underground working conditions, including a plurality of types of working conditions such as normal drilling, switching slurry pumping, pipe tripping, circulation loss, well kick and the like; and the controlled pressure drilling equipment automatically judges and identifies the working conditions and controls pressure changes according to the changes of the working conditions, and keeps the simulated bottom hole pressure constant to avoid abnormal conditions such as the circulation loss, the well kick and the like. The bottom hole pressure fluctuations are simulated by adjusting the opening of a throttlevalve B according to the flow and the density of a drilling fluid input by a slurry pump A; a choke manifold simulates the bore hole annular pressure loss; the opening of a throttle valve A is adjusted to simulate a circulation loss working condition; and a slurry pump B or an air source is started and the input flow is controlled to simulate a well kick working condition. By adopting the method and the device, the controlled pressure drilling parameters are precisely grasped, and the controlled pressure drilling equipment is debugged delicately.

Description

technical field [0001] The invention relates to the field of oil and natural gas drilling, a method and device for simulating downhole working conditions used in MPD experiments and tests, suitable for experiments and tests of MPD technology and equipment, and realizes indoor research and development of MPD technology. The purpose of device performance testing. Background technique [0002] Managed pressure drilling technology is a precise bottomhole pressure control drilling technology, which ensures accurate bottomhole pressure control during the entire drilling process, whether it is normal drilling, single root connection, tripping, etc., and reduces well kick, Lost circulation and other complex drilling conditions, compared with conventional drilling technology, can reduce 80% of downhole complex problems, reduce non-production time by 20% to 40%, and reduce drilling costs. However, this drilling technology requires high levels of software and hardware, as shown in: ① ...

AI Technical Summary

Problems solved by technology

Without perfecting the above two aspects of detailed indoor experiments and tests, MPD technology cannot be tested on the drilling site, and it is even more impossible to enter the drilling site for service

[0004] At present, there are no downhole working condition simulation methods and devices that can conduct a complete set of MPD technology and equipment experiments and tests at home and abroad. Therefore, it is potential to study a downhole working condition simulation method and equipment for MPD technology and equipment testing. Must do

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