A Drilling Equipment and Method Using Flow Monitoring to Realize Bottomhole Pressure Control

Abstract

The invention discloses a drilling equipment and a method for realizing bottom hole pressure control by using flow monitoring. The drilling equipment includes: mud pump inlet flow measurement system, back pressure pump inlet flow measurement system, drilling fluid return flow measurement system, automatic throttling manifold system, and rotary control head, liquid-gas separator, vibrating screen, all The inlet of the mud pump inlet flow measurement system is connected to the mud tank by a pipeline, and the outlet of the mud pump inlet flow measurement system is connected to the drill pipe by a pipeline. Through the bottom of the drill pipe, the drill bit travels from the borehole annulus to the rotary control head and connects with the automatic control unit. The inlet pipeline of the flow manifold system is connected with the outlet pipeline of the inlet flow measurement system of the back pressure pump; the inlet flow measurement system of the back pressure pump has a pipeline connected to the mud tank; the outlet of the automatic throttling manifold system has a pipeline and the return flow of drilling fluid The inlet of the measurement system is connected; the outlet of the drilling fluid return flow measurement system is connected with the inlet of the liquid-gas separator by a pipeline; the liquid-gas separator has two branches. The invention can effectively control or eliminate the bad influence caused by well bottom leakage or overflow on well drilling.

Description

technical field [0001] The invention belongs to the field of oil and natural gas drilling pressure control systems, and relates to a drilling equipment and method for realizing bottom-hole pressure control by using flow monitoring. Background technique [0002] Loss and overflow are downhole complex situations that are often encountered in the drilling process. Among them, leakage refers to a downhole complex situation in which drilling fluid leaks into the formation during oil and gas drilling engineering operations. On the one hand, it directly leads to the loss of a large amount of drilling fluid and affects normal drilling. During operation, the well wall may even become unstable due to the excessive drop in fluid column pressure, leading to well collapse or even sticking, and the scrapping of some or all well sections. It will cause serious damage to the reservoir; and overflow refers to a complex downhole situation in which formation fluid flows into the wellbore durin...

AI Technical Summary

Problems solved by technology

However, wellhead overflow may be caused by uneven weighting of the drilling fluid; if the pressure of the standpipe drops, it may be a puncture of the drilling tool; caused by

Using traditional drilling methods, if leakage or overflow is found, the amount of leakage or overflow is already large, and there is no quick solution. For example, if a leakage occurs, it is necessary to prepare for plugging, and if an overflow occurs, it is necessary to shut down the well for pressure, and then circulate Exhaust, extremely low efficiency, and hidden safety hazards

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