Downhole Resistivity Imaging System While Drilling

Abstract

(1) Purpose and scope of the study: As the drilling and development scale of the oil and gas reservoirs with deep, unconventional and other complex geological structures is expanded and deepened, the measurement of more sidewall formation details along the wellbore trajectory while drilling is required to guide the wellbore trajectory through the reservoir and improve the drilling catching rate and recovery. Therefore, it is of paramount importance to accurate identification of the formation structure information of 360° sidewall and the judgment of the change in the stratigraphic dip of formation to dynamically and accurately measure the sector angle of gravity tool face (GTF) of the drilling tool and the resistivity information of wellbore formation when drilling.

(2) Methods, steps and process of the study: For the aforesaid purpose, the downhole near-bit measurement-while-drilling (MWD) resistivity imaging system is designed. High-precision sensors for the real-time measurement of three-axis geomagnetism and gravity and the multi-source data fusion processing algorithm are used to conduct 360° imaging measurement of sidewall formation along wellbore trajectory under the conditions of strong vibration and impact and high speed during drilling, in combination with high-precision sidewall formation resistivity measurement method of button electrode.

(3) Results, cognition and conclusion of the study: The MWD resistivity imaging system is used in Turpan-Hami oilfield to measure the resistivity of the sidewall formation of the drilling section, upload the measured information of formation resistivity to the ground, accurately guide the adjustment of drilling direction, maintain the borehole trajectory through the reservoir, and improve the drilling efficiency and drilling catching rate.

(4) Innovation, technical contribution and significance of the study: The MWD resistivity imaging system, through real-time tracking of complex reservoir structure, can judge sidewall formation lithology at the first time and analyze the positional relationship between wellbore and reservoir to improve the efficiency and accuracy of geological steering decision-making and solve the problem of low drilling catching rate in complex reservoir.

Copyright 2022, IFEDC Organizing Committee.

This paper was prepared for presentation at the 2022 International Field Exploration and Development Conference in Xi’an, China, 16–18 November 2022.

This paper was selected for presentation by the IFEDC Committee following review of information contained in an abstract submitted by the author(s). Contents of the paper, as presented, have not been reviewed by the IFEDC Technical Team and are subject to correction by the author(s). The material does not necessarily reflect any position of the IFEDC Technical Committee its members. Papers presented at the Conference are subject to publication review by Professional Team of IFEDC Technical Committee. Electronic reproduction, distribution, or storage of any part of this paper for commercial purposes without the written consent of IFEDC Organizing Committee is prohibited. Permission to reproduce in print is restricted to an abstract of not more than 300 words; illustrations may not be copied. The abstract must contain conspicuous acknowledgment of IFEDC. Contact email: paper@ifedc.org.