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The Trajectory Optimization Design and Application for Shallow Extended Reach and Stepped Horizontal Well in Jilin Oilfield

Author: ZhangZuoNan
Tutor: GuanZhiChuan
School: China University of Petroleum
Course: Oil and Gas Well Engineering
Keywords: Shallow Large displacement Stepped horizontal wells Track design Friction
CLC: TE923
Type: Master's thesis
Year: 2008
Downloads: 238
Quote: 0
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Abstract


In recent years, the shallow horizontal well technology in the testing and promotion of Jilin Oilfield success, the ground limited displacement in the 190-600m of shallow reservoirs have been developed, so as to Fuyu old quarter yield, yield and oil field production has played a positive role. However, with the increase of the displacement of the horizontal wells, and ladder track implementation of drilling and casing operations process friction King, appeared not function properly oriented drilling and casing difficulties, even casing can not be next to a predetermined depth situation. The problem of how to design the wellbore trajectory to overcome friction in the drilling and casing, become the shallow stepped horizontal drilling key technologies that need to be addressed. Vertical depth of horizontal wells for the Jilin Oilfield shallow extended reach wells and ladder, long horizontal section, full well horizontal displacement, in the process of drilling and casing friction characteristics in commonly used friction torque calculation model based on the friction generated by the additional column rigid force, suitable for large displacement wells and stepped horizontal wells torque and drag analysis model and the drill string and casing string through capacity analysis method. Using the model and method can be achieved under different track conditions, torque and drag analysis, and the drill string and casing string in the wellbore through capacity analysis. Ladder of track design basic model for the ladder horizontal wells a well multi-target, the target is more complex ladder segment orbit design, according to the association between the target target different combination and solving and design methods. With five basic model can easily design complex the ladder horizontal wells ladder segment track of any number of targets. On the basis of theoretical studies, combined with the general design requirements and characteristics of the Jilin Oilfield shallow stepped horizontal wells were the shallow ladder the horizontal wells ladder segment orbital optimization design analysis and ladder segments track friction influencing factors. Given track optimize design principles, steps, models and methods, and to form a stepped horizontal wells the ladder segments orbit design technology, can better meet the the ladder segments orbit optimized design, with a BHA or completion string The optimized friction smaller orbit, designed to provide technical support for of Jilin Oilfield shallow stepped horizontal wells. Greater in order to to make hanging Shengeng shallow, displacement of shallow horizontal wells casing down to the bottom of the well, in addition to taking the above technical measures, the design process can be recycled compression devices. Field tests show that: good sealing performance and reliability of the device, to achieve the desired effect. Optimize the design method, based on the shallow large displacement ladder trajectory of horizontal wells and vertical depth of 11 displacement ratio of greater than 1.8 horizontal wells in the field trials, application results show that this method is a set of suitable the Jilin Oilfield shallow reservoir development of affordable technology.

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CLC: > Industrial Technology > Oil and gas industry > Oil machinery and equipment and automation > Drilling machinery equipment > Derrick and lifting equipment
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