A fast forward algorithm for real-time geosteering of azimuthal gamma-ray logging

Qin, Zhihong; Pan, Heping; Wang, Zhonghao; Wang, Bintao; Huang, Ke; Liu, Shaohua; Li, Gang; Konaté, Ahmed Amara; Fang, Sinan

doi:10.1016/j.apradiso.2017.02.042

Cited by 11 publications

(2 citation statements)

References 19 publications

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“…A substantial amount of research and exploration have been conducted on this technology by prior studies. In prominent shale oil and gas blocks globally, geosteering criteria are established based on reservoir heterogeneity, variations in the formation occurrence along the horizontal trajectory, and the planned horizontal section length, aiming to enhance reservoir-encountered rates with geological sweet spots while boosting drilling efficiency and minimizing costs. − However, Block H, characterized by a relatively low exploration maturity and the presence of small-scale structures and faults, poses significant challenges to precise well tracjectory and formation interface predictions.…”

Section: Introductionmentioning

confidence: 99%

Study on Key Technologies of Geosteering for Shale Gas Horizontal Wells in the Complex Structural Area of Block H in Western Hubei-Eastern Chongqing

Shi,

Feng,

Zhao

et al. 2024

ACS Omega

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Block H, located in western Hubei-eastern Chongqing, remains at a low exploration degree. Characterized by its complex structural attributes, the area presents adverse conditions such as a thin thickness of high-quality shale reservoir, rapid lateral formation occurrence, and poor stratigraphic correlation, challenging conventional geosteering methods. The primary shale gas reservoir in Block H corresponds to the Upper Permian Wujiaping Formation. To ensure that the shale gas horizontal wells in this block effectively penetrate high-quality gas reservoirs, this study delves into the geological characteristics of this stratigraphic unit, identifies principal challenges faced by current geosteering techniques, and introduces a tailored technical solution. This solution encompasses the application of real-time 3D geological modeling to track while drilling, identification of steering marker layers, optimization of steerable tools, and optimization of the steering trajectory while drilling. In the technology of optimization of the steering trajectory while drilling, a trajectory control calculation model based on the average angle technique was established for the first time. Additionally, a sectional control chart for marker layers and well inclination under different deflecting constraints was established. These methods have solved the problems of large error in target prediction and poor trajectory control effects by using the equal thickness method alone. The findings from this study can significantly enhance target prediction and trajectory control accuracy in complex structural areas, offering pivotal insights for the proficient development of analogous shale gas reservoirs in the future.

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Section: Introductionmentioning

confidence: 99%

Study on Key Technologies of Geosteering for Shale Gas Horizontal Wells in the Complex Structural Area of Block H in Western Hubei-Eastern Chongqing

Shi,

Feng,

Zhao

et al. 2024

ACS Omega

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“…In the system, logging instruments are used for recording the physical parameters of rock mass, such as gamma ray, resistivity, and volume density. e acquired information was used to evaluate the strata information and distribution of oil resource [35][36][37][38]. However, the LWD technology is rarely used in underground coal mines.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Comprehensive Real‐Time Methods to Determine Geological Condition of Rock Mass along the Boreholes while Drilling in Underground Coal Mines

Niu

Zhang

et al. 2019

Shock and Vibration

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The geological condition is essential for mining design and disaster control in underground coal mines. The present research focuses on the real-time assessment method on rock mass condition during drilling boreholes. In situ comprehensive experiments were carried out using three methods, which are measurement while drilling (MWD) system, vibration measurement while drilling (VMWD) system, and borehole camera detecting system. In the MWD system, the operating parameters of the drilling machine were recorded, and a dimensionless index Id based on the collected parameters was adopted to assess the geological condition along the borehole. The results show that the state of rock mass can be well classified using the MWD system for both the cross-layer and in-seam boreholes. In the VMWD system, the vibration of the drilling bit was monitored, and the signal was analyzed in both time domain and frequency domain. The results indicate that the rock mass condition can be quantitatively evaluated using the mean square value of the signal and qualitatively estimated using the energy of the spectrum. In the borehole camera system, the photos of the rock mass along the borehole could be well captured, and the identified rock mass condition was used to verify the results of the MWD and VMWD systems. Comprehensive compassion between the results from the three systems shows that all the methods can give valuable information for the geological condition, and the outcomes of the different methods are generally comparable. For practical purposes, the advantages of the involved three detecting systems are discussed.

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Application of Near-Bit LWD Gamma Image Logging in Horizontal Coalbed Methane Reservoir

Yang,

Mao,

Fan

et al. 2024

Springer Series in Geomechanics and Geoengineering

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A fast forward algorithm for real-time geosteering of azimuthal gamma-ray logging

Cited by 11 publications

References 19 publications

Study on Key Technologies of Geosteering for Shale Gas Horizontal Wells in the Complex Structural Area of Block H in Western Hubei-Eastern Chongqing

Study on Key Technologies of Geosteering for Shale Gas Horizontal Wells in the Complex Structural Area of Block H in Western Hubei-Eastern Chongqing

Experimental Study on Comprehensive Real‐Time Methods to Determine Geological Condition of Rock Mass along the Boreholes while Drilling in Underground Coal Mines

Application of Near-Bit LWD Gamma Image Logging in Horizontal Coalbed Methane Reservoir

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