准噶尔南缘深井机械比能分析与钻井参数优化

Mechanical Specific Energy Analysis and Optimization of Drilling Parameters for Nanyuan Deep Formations in Junggar Basin

路宗羽 徐生江 蒋振新 田龙 钟尹明

LU Zongyu XU Shengjiang JIANG Zhenxin TIAN Long ZHONG Yinming

中国石油新疆油田分公司工程技术研究院, 新疆 克拉玛依 834002

Research Institute of Engineering Technology, Xinjiang Oilfield Company, PetroChina, Karamay, Xinjiang 834002, China

准噶尔盆地南缘深部地层具有埋藏深、岩石抗压强度高、可钻性差等特点，导致复杂情况多、钻井周期长，单井平均钻井周期335 d，深部地层平均机械钻速在2 m/h以下，提高机械钻速是南缘深部地层钻井的迫切需求和巨大挑战。针对南缘深部地层复杂条件，建立井口载荷与钻头载荷之间的关系，分析螺杆钻具输出特性，推导复合钻井机械比能模型。以HT1井五开190.5 mm井段实钻数据为基础，针对不同地层分析南缘深部地层机械比能与机械钻速之间的关系，优选钻井方式，确定合理的钻井参数范围。机械比能分析表明，连木沁组对转速不敏感，推荐采用常规钻井方式并适当增加钻压；胜金口组和呼图壁河组推荐采用复合钻井，适当提高钻压；清水河组和喀拉扎组扭冲提速效果不明显，建议尝试新型提速工具，考虑尝试高钻压、适当转速的参数组合。研究结果可为后续南缘深部地层提高钻速提供参考。

The deep formations in Nanyuan Area of Junggar Basin are characterized by large burial depth, high compressive strength of rock, poor drillability, and strong hold-down effect from drilling mud, which result in frequent drilling accidents and extended drilling cycle (average drilling period 335 d for single well). The average rate of penetration in deep formations are below 2 m/h. It is of urgent necessity and massive challenge to improve ROP in drilling the Nanyuan deep Formations. Aiming at the complicated conditions in Nanyuan deep Formations, a relationship between the load at wellhead and the load on bit is established, and the output characteristics of positive displacement motor is analyzed. Then the Mechanical Specific Energy (MSE) model for the compound drilling method is derived. Based on the drilling data of the 190.5 mm section in the Hutan No.1 Well, focusing on various geological formations, analyze the relationship between MSE and ROP in Nanyuan deep Formations, which is helpful for optimizing drilling method and locating proper ranges of drilling parameters. According to the MSE analysis, ROP in Lianmuqing Formation is bot sensitive to rpm (rotation per minute), where conventional drilling method with improved WOB (weight on bit) is recommended. Compound drilling method with a properly increased WOB is suggested in Shenjinkou and Hutubihe formations. The improvement of ROP is not obvious in Qingshuihe and Kalazha formations when torsional impactor is used. Thus are novel tools suggested to boost ROP and consider the parametric combination of high WOB and moderate RPM. The research results are expected to provide reference for enhanceing penetration rate in Nanyuan deep formation.

10.11885/j.issn.16745086.2021.04.29.11