Intelligent reaming automatic control method and system for soft pump pressure

Abstract

The present invention provides an intelligent reaming automatic control method and system for a soft pump pressure. The intelligent reaming automatic control method for the soft pump pressure comprises the steps that a normal pump pressure value and a torque value are obtained; parameter thresholds including a pump pressure, a torque and a weight on bit are set and an automatic reaming rate and aminimum safe displacement are set; when an automatic reaming mode is triggered, according to the normal pump pressure value and the torque value, the reaming will be carried out according to the selected forward or reverse reaming; and during the reaming, real-time parameter values including the pump pressure, the torque, an outlet flow rate and the weight-on-bit are acquired, and according to theparameter thresholds, when abnormal changes occur in the pump pressure, the torque, the outlet flow rate and the weight-on-bit parameters, an electromagnetic pressure regulating valve, a winch speedcontroller and a drilling pump speed controller are triggered, so as to control the speed limit and braking of the winch, and perform emission reduction and braking control on the pump output displacement according to the minimum safe displacement.

Description

technical field [0001] The invention relates to the technical field of drilling control, in particular to a method and system for automatic control of soft pump pressure intelligent reaming. Background technique [0002] During the drilling process, tripping and tripping encounter obstructions and jams occur from time to time, and the technical measures of reaming (forward reaming / reversing reaming) are usually taken on site to deal with the problems of tripping and tripping encountering obstructions and jamming. However, forward reaming / reversing reaming has high requirements on the driller's operation, and the driller needs to observe the changes in parameters such as torque, pump pressure, WOB and outlet flow, and make corresponding technical operation adjustments. [0003] In the actual reaming process, it is difficult for the driller to control various parameters in an all-round way and make corresponding technical operation adjustments in a timely and rapid manner. Th...

AI Technical Summary

Problems solved by technology

[0003] In the actual reaming process, it is difficult for the driller to control various parameters in an all-round way and make corresponding technical operation adjustments in a timely and rapid manner. The situation deteriorated further; during reaming, if the driller is a little careless in operation, the pump will often be blocked, and serious pump blocking will lead to lost circulation and well collapse (well collapse caused by lost circulation, well collapse after pump blocking in the mudstone section), It further deteriorates the wellbore condition, greatly increases the difficulty of reaming (forward reaming / back reaming), and even pipe sticking and overflow (overflow after lost circulation), and if the drilling pressure If it is too large, the risk of drawing new eyes will increase accordingly

Images