A Drilling Pressure Control System

Abstract

The invention provides a drilling pressure control system and relates to the technical field of oil drilling. The drilling pressure control system comprises a drilling device, a wellhead device, a drilling fluid circulating system and a drilling pressure control module, wherein the drilling device comprise a drill rod rack (1) and a drill rod mechanism (2); the drill rod mechanism (2) is erected on a wellhead through the drill rod rack (1); the well head device comprises a wellhead safety base (3), a wellhead four-way joint (4), a wellhead blowout prevention device (5) and a wellhead slurry outlet pipe (6); the wellhead safety base (3) is circular ring-shaped and is mounted on the wellhead; a drilling fluid circulating outlet is formed in the wellhead safety base (3). The drilling pressure control system provided by the invention is reasonable in structural design and simple and quick in operation and can perform real-time quantitative monitoring on drilling pressure under an oil and gas well and control each electromagnetic valve through a program so as to adapt to various unstable factor caused by downhole pressure change and greatly improve the drilling safety, thereby having a practical value.

Description

technical field [0001] The invention relates to the technical field of petroleum drilling, in particular to a drilling pressure control system. Background technique [0002] Managed pressure drilling (MPD) technology is a new drilling technology developed in recent years. It is mainly used to protect underground resources such as oil and gas layers, prevent lost circulation during drilling, ensure drilling safety and speed up drilling. However, the current managed pressure drilling methods are mainly "bottom hole constant pressure" control method and "micro flow control" control method, which cannot consider and control the bottom hole pressure and formation pressure, and cannot achieve a real-time balance between the two , the drilling of the "zero pressure window" formation cannot be realized. Moreover, the supporting equipment is complicated, the control requirements are high, and the on-site implementation is difficult, which has great limitations. Petroleum Drilling T...

AI Technical Summary

Problems solved by technology

There are four problems in this control method: one is that the control purpose is "constant bottom hole pressure", that is, pb=pma+pla+pax (pb is the bottom hole pressure, pma is the hydrostatic pressure of the annular space, and pla is the circulation time annular pressure loss, pax is wellhead back pressure), without considering the balance between bottom hole pressure and formation pressure

However, this pressure control method has the problems of complex matching of devices and instruments and complex implementation process, making it difficult to popularize and apply

Images