A managed pressure drilling method and device for a single throttle channel adapting to large flow rate changes

Abstract

The invention relates to a pressure-controlled drilling method and device with a single throttle channel adaptable to large flow changes, which are applied in the field of wellbore pressure and flow control in petroleum and natural gas drilling. The device is composed of standpipe measurement system, back pressure compensation manifold and flow measurement system, connection manifold, automatic throttle manifold, wellhead return flow measurement system, signal acquisition and logic control system, and can measure bottom hole pressure, wellhead Accurately measure vertical pressure, casing pressure, and pumped and returned flow of drilling fluid, and analyze the bottomhole working conditions through logic control system analysis, and then select closed-loop control or block experience mode to automatically adjust the choke manifold in real time Apply back pressure to the wellhead to achieve good wellbore pressure control, thus effectively solving complex downhole problems such as narrow density window and co-existence of blowout and leakage.

Description

technical field [0001] The invention relates to the technical field of wellbore pressure and flow control for oil and natural gas drilling, in particular to a single-throttle channel pressure-controlled drilling method and device adapted to large flow changes. Background technique [0002] With the development of oil exploration to deep and complex formations, downhole complexities such as narrow density window and coexistence of blowout and loss have become technical bottlenecks that affect and restrict the process of oil exploration and development and drilling construction. As a result, higher requirements are put forward for oil and gas drilling wellbore pressure and flow control capabilities. The narrow density safety window means that the safe drilling window between formation pore pressure, fracture pressure and leakage pressure is relatively small. Under conventional drilling methods, the fluctuation range of annular pressure will exceed this safe drilling window, wh...

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Problems solved by technology

[0008] In view of the above problems, the purpose of the present invention is to provide a single-throttle channel pressure-controlled drilling device adapted to large flow changes and a method for controlling wellbore pressure and flow using the device, which can achieve good wellbore pressure control and effectively solve the problem of narrow density Downhole complex problems such as window, blowout and leak coexistence

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