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

doi:10.11885/j.issn.16745086.2021.04.29.11

Abstract

Abstract: 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 ϕ190.5 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.

Key words: mechanical specific energy, deep formation, positive displacement motor, parameter optimization, compound drilling

CLC Number:

TE245

LU Zongyu, XU Shengjiang, JIANG Zhenxin, TIAN Long, ZHONG Yinming. Mechanical Specific Energy Analysis and Optimization of Drilling Parameters for Nanyuan Deep Formations in Junggar Basin[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2021, 43(4): 51-61.

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