Application of GA-BP neural network algorithm in killing well control system
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S.I. : ATCI 2020
Application of GA-BP neural network algorithm in killing well control system Haibo Liang1
•
Qi Wei1 • Dengyun Lu2 • Zhiling Li2
Received: 14 May 2020 / Accepted: 12 August 2020 Ó Springer-Verlag London Ltd., part of Springer Nature 2020
Abstract Killing operation is an effective measure to restore bottom-hole pressure balance after unbalanced bottom-hole pressure shut-in. In the traditional well killing operation, the opening of the hydraulic throttle valve is manually adjusted by the throttle control box, and the manual control has the problems of uncertainty and low control precision, which makes the stability control of well killing operation a difficult problem. This paper presents a feedback control model based on a large number of real-time bottom-hole data, historical data and GA-BP neural network prediction. Through the intelligent control of throttle valve opening in the process of well killing operation, the fast, accurate and stable self-feedback control of bottom-hole pressure prediction and prediction output is realized. The analysis results show that the control model predicted by GA-BP neural network can effectively adjust the throttle opening and realize the stable and effective control of bottom-hole pressure. Keywords Killing well Bottom-hole pressure control Control model GA-BP neural network
1 Introduction The conventional killing process is that after the overflow [1] shut-in, the original drilling fluid is replaced by pumping higher density killing fluid into the accident well, and at the same time, the bottom-hole pressure produced by the killing fluid is slightly greater than the formation pressure. In order to reconstruct and restore the pressure balance system, the primary purpose of killing emergency operation is to circulate the drilling fluid contaminated by formation invading fluid out of the wellbore and re-establish the bottom-hole pressure balance system. When the pumped killing fluid circulates through the wellbore to the wellhead, the casing pressure in the throttle manifold system is zero, which indicates that the formation pressure system has re-established the equilibrium relationship and completed the well killing [2]. At present, the commonly & Haibo Liang [email protected] 1
School of Mechanical Engineering, Southwest Petroleum University, Chengdu 610500, China
2
CNPC Chuanqing Drilling Engineering Technology Research Institute, Deyang 618300, China
used killing operation methods are: driller’s method, engineer method, side loop side aggravation method and pressure return method, etc. [3]. In this paper, the engineer method is used to study the control of kill bottom-hole pressure [3]. After shut-in, record the shut-in parameters, calculate the relevant killing parameters and fill in the operation table; based on the calculated pressure well parameters configuration of well killing fluid, then according to the corresponding operation specification, will be completed configuration of well killin
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