Application of 3D and Near-Wellbore Geomechanical Models for Well Trajectories Optimization (Russian)

Alchibaev, D. V.; Glazyrina, A. Ye.; Ovcharenko, Yu. V.; Kalinin, O. Yu.; Lukin, S. V.; Martemyanov, A.N.; Zhigulskiy, Svetlana; Chebyshev, Igor; Sidelnik, A. V.; Bazyrov, I. Sh.

doi:10.2118/187830-ru

Cited by 3 publications

(1 citation statement)

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“…Consequently, the construction period is prolonged and the drilling cost is increased due to engineering accidents such as sticking. So, it will be of great significance to accurately identify and predict the potential geological risks to be drilled by using well logging, seismic (VSP), regional geology, mud logging, and drilling information before drilling [13][14][15].…”

Section: Research On Multi-source Information Fusion Methods Such As ...mentioning

confidence: 99%

Research and Practice of Risk Early Warning Technology for Lost Circulation with Drilling under the Conditions of Geological Engineering Information Fusion: The Example of the Yuanba Area

et al. 2022

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In the Yuanba area, many lost circulation accidents occur due to the complex geological structure, broken strata, and developed fractures, which seriously affect construction safety and drilling costs. Therefore, the Yuanba district is the focus of this paper. Firstly, a three-dimensional geomechanical model is established through multi-source information fusion to identify the main geological risk factors of lost circulation, according to the data on drilling and well logging in the operation area. Then a risk warning model and evaluation methods for loss circulation, based on geological engineering data fusion, are established, through which the characteristic parameters of various loss of circulation risks can be calculated in real time, parameters along the well trajectory can be extracted and compared, and thus, the risk of lost circulation is warned and analyzed in real time. The early warning of lost circulation risk can be achieved during drilling operations, which can improve the drilling efficiency and shorten the drilling cycle as a result.

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Section: Research On Multi-source Information Fusion Methods Such As ...mentioning

confidence: 99%

Research and Practice of Risk Early Warning Technology for Lost Circulation with Drilling under the Conditions of Geological Engineering Information Fusion: The Example of the Yuanba Area

et al. 2022

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Estimation of the fishbone optimal orientation for a Yamalo-Nenets Autonomous District oilfield

Seryakov¹,

Podberezhny

2023

Georesursy

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The objective is the junction zone of the multilateral fishbone wellbores planned at the Yamalo-Nenets Autonomous District oilfield. Reservoir rock stability around the junction area is estimated with the help of the full coupled 3D poroelastic modeling. In order to determine the optimal fishbone location, the different cases with the various sidetrack inclination, parent well orientation along the maximal and minimal horizontal stresses with the condition of sidetracking in the rock with standard and reduced strength were simulated. The permissible depression and repression values were estimated for each fishbone configuration. For the cases with unstable junction the safe pressure drop and overbalance for drilling regime were determined. It was shown that in the case when mudcake is formed on the wellbores wall the pressure drop can be essentially decreased with fishbone stability retention.

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Wellbore Stability Analysis in an Offshore High-Pressure High-Temperature Gas Field Revealed Lost Times Due to Lack of Well Trajectory Optimization

Ashena¹,

Roohi

Ghalambor

2022

SPE International Conference and Exhibition on Formation Damage Control

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Wellbore stability (WBS) problems causes excessive lost times and cost during drilling. Drilling 10 development wells in an offshore high pressure high temperature (HPHT) gas field showed different non-productive time (NPT) values due to different severity of WBS issues such as kick flows, lost circulation, tight holes, stuck pipes which are responsible for repeated reaming, fishing and sidetracking. To reveal the reasons for the different severity of WBS problems in the studied wells and enhance future drilling, this work focused its investigation on the geomechanical modeling and WBS analysis. The results of the constructed geomechanical model show that well trajectory parameters of azimuth and inclination angle have crucial effects on the safe mud weight window and the consequent WBS problems. The stable mud weight window decreases as the borehole deviation increases, the maximum allowable inclination angle was determined as 50 degrees; otherwise, severe WBS issues are expected during drilling. The well azimuth showed to have trivial effect on the breakout mud weight, whereas the breakdown mud weight is significantly greater in wells drilled in the direction of minimum horizontal stress (NW-SE). Therefore, as safe mud weight windows are broader in wells with NW-SE, it is expected that such wells have greater wellbore stability than wells drilled in other directions. Therefore, the different extent of the actual field WBS issues in the studied wells was attributed to their well trajectories, in accordance with the WBS analysis. Optimization of wellbore trajectory parameters while taking into account reservoir targets are recommended for future drilling in HPHT fields. This would contribute to reducing WBS problems and NPT for subsequent drilling jobs and finally contribute to more efficient drilling operations.

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Application of 3D and Near-Wellbore Geomechanical Models for Well Trajectories Optimization (Russian)

Cited by 3 publications

References 1 publication

Research and Practice of Risk Early Warning Technology for Lost Circulation with Drilling under the Conditions of Geological Engineering Information Fusion: The Example of the Yuanba Area

Research and Practice of Risk Early Warning Technology for Lost Circulation with Drilling under the Conditions of Geological Engineering Information Fusion: The Example of the Yuanba Area

Estimation of the fishbone optimal orientation for a Yamalo-Nenets Autonomous District oilfield

Wellbore Stability Analysis in an Offshore High-Pressure High-Temperature Gas Field Revealed Lost Times Due to Lack of Well Trajectory Optimization

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