Continuous circulating system

Abstract

The invention discloses a continuous circulating system for realizing continuous circulation of slurry in the drilling process, comprising a hydraulic control device, a runner conversion device and a continuous circulating short-joint device. The system realizes control and conversion of slurry flowing pipelines by the hydraulic control device and the runner conversion device, and realizes continuous circulation of slurry by matching with a bypass structure of the continuous circulating short-joint device, so that the stability of the pressure of a borehole is maintained, the annulus backpressure value of the borehole is effectively controlled, the stability of the borehole wall and good effect for cleaning the borehole are maintained, and the runner conversion device and the continuous circulating short-joint device are mutually matched for working so as to realize continuous circulating operation of the borehole. The continuous circulating system is simple in structure, small in occupied space and convenient to operate and is especially suitable for being used in drilling on an offshore platform. In addition, the system can be concentrated in a system container after being disassembled, and the installation and the disassembly are convenient, so that the system is very important for simple operation on the offshore operation platform.

Description

technical field [0001] The invention relates to the technical fields of geological drilling and petroleum drilling, in particular to a continuous circulation system. Background technique [0002] Oil drilling is known as the key to the oil industry and occupies an extremely important position in the oil industry. From oil and gas exploration in the exploration stage to development and production of gasoline, to the implementation of oil and gas field production increase measures, all must be achieved through drilling. With the development and progress of oil and gas drilling technology, operators can drill various technically difficult wells such as deep wells, ultra-deep wells, horizontal wells, extended-reach wells, and multi-bottom wells by applying new drilling technologies. Offshore drilling from shallow water to deep water and ultra-deep water has achieved great results. However, there are many wells that require the continuous circulation of mud in the wellbore to ma...

AI Technical Summary

Problems solved by technology

[0006] The technical problem mainly solved by the present invention is to provide a continuous circulation system to realize the continuous circulation of mud drilling, keep the bottom hole pressure stable, no or less pressure excitation, and solve the problem of stopping the pump due to make-up and breakout during the drilling process. The generated downhole pressure is excited, resulting in the problem of unbalanced and changeable bottomhole pressure. At the same time, it can avoid problems such as cuttings bed or drill sticking caused by the static mud settling when the pump is stopped.

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