Single-throttling-channel pressure control drilling method and device suitable for high-flow change

Abstract

The invention relates to a single-throttling-channel pressure control drilling method and a single-throttling-channel pressure control drilling device suitable for high-flow change, and is applied to the field of well tube pressure and flow control during petroleum and natural gas drilling. The device consists of a vertical pipe measurement system, a back pressure compensation manifold and flow measurement system, a connection manifold, an automatic throttling manifold, a wellhead return flow measurement system and a signal acquisition and logic control system. The device can precisely measure the pressure at the bottom of a well, the vertical pressure at a wellhead, the sleeving pressure and pump-in and returning flow of drilling fluid; furthermore, due to the analysis of the logic control system, a working condition of the bottom of the well is judged, and a closed-loop control or block experience mode is selected according to the working condition, so that the back pressure applied by the throttling manifold to the wellhead is automatically adjusted in real time, and perfect well shaft pressure control is implemented; therefore the complicated underground problems of a narrow density window, spraying and leakage coexistence and the like are effectively solved.

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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