Abstract
The deep heavy oil reservoir of Jimsar well block, which located in Xinjiang oilfield, was developed by cluster well in 2016. In view of the ground environment, long open hole section and poor wellbore stability, the scheme which based on the research of factory-like wellsite platform deployment, well trajectory design and reservoir protection, was designed and carried out in the block. Firstly, the platform was divided into different control regions according to the anti-collision requirement. Secondly, truck-mounted drilling rig and civil power were applied to the factory-like drilling. Thirdly, well track was designed to be three parts: straight, increase and steady. The design can improve the proportion of composite drilling footage. Fourthly, the method of plane scanning and normal surface scanning was adopted to ensure the safety of downhole trajectory. Finally, the natural polymer drilling fluid system and drilling fluid reuse system were used to protect environment and reduce drilling cost. The results show that the maximum reducing time of single drill rig is 32.5 day, and the penetration rate of whole platform is increasing continuously.
Highlights
The deep heavy oil reservoir of Wutonggou formation in Jimsar Well Block is located in Xinjiang oilfield
2.1 Deployment of factory-like wellsite platform According to the wellhead position, well hole axis trend, drilling target and distribution of well control area, the platform with 43 wells is divided into three different control areas to avoid the occurrence of cross orbit in the different control areas, and to reduce the overall risk of anti-collision10
Considering the overall anti-collision needs of platform wells, the platform with 43 wells is divided into three different control areas, designed into double rows platform with wellhead spacing of 5m and row spacing of 60m
Summary
The deep heavy oil reservoir of Wutonggou formation in Jimsar Well Block is located in Xinjiang oilfield. Before 2015, the single well deployment was mainly adopted, there was no obviously economic benefit from middle and deep heavy oil reservoir in this block. In 2016, in order to protect the farm, grassland and environment, reduce the land acquisition area, the cluster wells should be deployed[3-7]. The difficulties of factory-like drilling in Jimusar Well Block are mainly concentrated on platform layout, drilling cost reduction, wellbore trajectory calculation method, anti-collision technology, and so on. The cluster well track of factory-like drilling is very tight, so that giving rise to collision risk. Factory-like drilling is a relatively advanced drilling operation model, which involves various of specialties and complex related technologies
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