Automatic throttling pipe converging system

Abstract

The invention discloses an automatic choke-line manifold system which comprises choke-line manifold and a hydraulic control system. The choke-line manifold comprises a blowing out channel, a main throttling channel, an auxiliary throttling channel and an overflow pressure adjusting channel. A pressure sensor is arranged on a six-way block of the choke-line manifold. An electrohydraulic pressure control valve of the hydraulic control system can be a proportional pressure relief valve or a servo valve. According to the automatic choke-line manifold system, precise well opening back pressure control ( comprising a start-stop pump and overflow of exhausted air) required in the whole process of well drilling can be achieved, procedure switching between each well drilling procedure can be achieved, and measuring function of flow of specific fluid can be achieved.

Description

technical field [0001] The invention relates to a choke manifold system for drilling, in particular to an automatic choke manifold system. Background technique [0002] At present, managed pressure drilling technology is getting more and more attention at home and abroad. In 2005, IADC and SPE held a special meeting on underbalanced operations (UBO) and managed pressure drilling (MPD) to discuss, and defined it as: managed pressure drilling technology It is a drilling method that can more accurately control the annular pressure profile of the wellbore. Its purpose is to determine the downhole pressure window and control the annular pressure based on this. Controlled pressure drilling uses certain equipment and methods to accurately control the downhole pressure, and can quickly make correct adjustments according to changes in downhole pressure, thereby reducing the risk and cost of drilling in formations with narrow downhole pressure windows, easy leakage, and easy blowout, ...

AI Technical Summary

Problems solved by technology

[0011] Situation 2: After gas invasion occurs at the bottom of the well, when the gas reaches the wellhead, that is, when the gas slips and reaches the wellhead throttle valve, the density of the drilling fluid changes greatly due to the gas-liquid slug, and the propagation from the casing pressure to the standing pressure The delay effect of the casing pressure makes the casing pressure unable to respond to the change of the standing pressure in many cases, causing the adjustment of the standing pressure to fluctuate greatly, resulting in the overshoot of the bottom hole pressure

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