Overcoming Thin Reservoir Geosteering using Advanced Technique in Sultanate of Oman

2021 ◽  
Author(s):  
Sarah Mohammed AlGhamdi ◽  
Amina Beche ◽  
Muhannad Awadalla ◽  
Hafidh Naamani ◽  
Fadi Aljiroudi ◽  
...  
Keyword(s):  
Boundary Detection ◽  
Sultanate Of Oman ◽  
Geological Uncertainty ◽  
Advanced Technique ◽  
Well Placement ◽  
Low Resistivity ◽  
Logging While Drilling ◽  
The Right ◽  
Thin Reservoir ◽  
Stability Results

Abstract Drilling long laterals within Shuaiba limestone reservoir without exit to Nahr-Umar shale in the challenging field "B" that is characterized by geological uncertainty can have major risks. The low to very low resistivity environment reservoirs are common in Oman especially while placing wells nearby OWC; on a reservoir spot window of 1-2m TVD only. The main objective is to place the well less than 1m TVD below the reservoir top, this was achieved by utilizing Multilayer Bed Boundary Detection and Rotary Steerable System. Integrating propagation resistivity curves response with the directional resistivity curves response from Bed Boundary detection tool have been used as a guide for an optimal well placement in low resistivity reservoir, along with Rotary Steerable System are one of the best strategies which have been used to place the wells within the right spot. For tight geosteering window with an aggressive formation tendency pushing the azimuth left or right and continues inclination instability associated with the existence of an interbedded layers of hard streaks within the reservoir, a faster and more competent Rotary Steerable System tool and Bit selection is required, as proven it provides better stability results for achieving well placement objectives and respond in fast manner to geosteer in real time. The objective of this paper is to describe the geosteering logging while drilling (LWD) technology and technique and Rotary Steerable system (RSS).

Optimum Horizontal Well Placement in Very-Low-Resistivity Reservoir With a Directional and Deep Logging-While-Drilling Technology

2007 ◽  
Author(s):  
Augusto Cesar Carvalho da Silva ◽  
Jose Antonio Cavero ◽  
Waldyr Rodriguez ◽  
Johana Vargas ◽  
Marco Augusto ◽  
...  
Keyword(s):  
Horizontal Well ◽  
Well Placement ◽  
Low Resistivity ◽  
Drilling Technology ◽  
Logging While Drilling

A Novel Workflow for Geosteering a Horizontal Well in a Low Resistivity Contrast Anisotropic Environment: A Case Study in Semoga Field, Indonesia

2021 ◽  
Author(s):  
Yessica Fransisca ◽  
Karinka Adiandra ◽  
Vinda Manurung ◽  
Laila Warkhaida ◽  
M. Aidil Arham ◽  
...  
Keyword(s):  
Real Time ◽  
Horizontal Well ◽  
Gamma Ray ◽  
Lessons Learned ◽  
Electrical Anisotropy ◽  
Anisotropy Ratio ◽  
Well Placement ◽  
Low Contrast ◽  
Low Resistivity ◽  
The Subject

Abstract This paper describes the combination of strategies deployed to optimize horizontal well placement in a 40 ft thick isotropic sand with very low resistivity contrast compared to an underlying anisotropic shale in Semoga field. These strategies were developed due to previously unsuccessful attempts to drill a horizontal well with multiple side-tracks that was finally drilled and completed as a high-inclined well. To maximize reservoir contact of the subject horizontal well, a new methodology on well placement was developed by applying lessons learned, taking into account the additional challenges within this well. The first approach was to conduct a thorough analysis on the previous inclined well to evaluate each formation layer’s anisotropy ratio to be used in an effective geosteering model that could better simulate the real time environment. Correct selections of geosteering tools based on comprehensive pre-well modelling was considered to ensure on-target landing section to facilitate an effective lateral section. A comprehensive geosteering pre-well model was constructed to guide real-time operations. In the subject horizontal well, landing strategy was analysed in four stages of anisotropy ratio. The lateral section strategy focused on how to cater for the expected fault and maintain the trajectory to maximize reservoir exposure. Execution of the geosteering operations resulted in 100% reservoir contact. By monitoring the behaviour of shale anisotropy ratio from resistivity measurements and gamma ray at-bit data while drilling, the subject well was precisely landed at 11.5 ft TVD below the top of target sand. In the lateral section, wellbore trajectory intersected two faults exhibiting greater associated throw compared to the seismic estimate. Resistivity geo-signal and azimuthal resistivity responses were used to maintain the wellbore attitude inside the target reservoir. In this case history well with a low resistivity contrast environment, this methodology successfully enabled efficient operations to land the well precisely at the target with minimum borehole tortuosity. This was achieved by reducing geological uncertainty due to anomalous resistivity data responding to shale electrical anisotropy. Recognition of these electromagnetic resistivity values also played an important role in identifying the overlain anisotropic shale layer, hence avoiding reservoir exit. This workflow also helped in benchmarking future horizontal well placement operations in Semoga Field. Technical Categories: Geosteering and Well Placement, Reservoir Engineering, Low resistivity Low Contrast Reservoir Evaluation, Real-Time Operations, Case Studies

Optimization of Smart Well Placement in Waterfloods Under Geological Uncertainty in Intelligent Fields

2020 ◽  
Author(s):  
Cenk Temizel ◽  
Celal Hakan Canbaz ◽  
Hasanain Alsaheib ◽  
Hashem Monfared
Keyword(s):  
Geological Uncertainty ◽  
Well Placement

scholarly journals An efficient optimization of well placement and control for a geothermal prospect under geological uncertainty

2015 ◽  
Vol 137 ◽  
pp. 352-363 ◽  
Author(s):  
Mingjie Chen ◽  
Andrew F.B. Tompson ◽  
Robert J. Mellors ◽  
Osman Abdalla
Keyword(s):  
Geological Uncertainty ◽  
Well Placement ◽  
And Control

Well Placement by Boundary Detection / Optimization of Horizontal well Performance. A Case Study from U.A.E.

2009 ◽  
Author(s):  
Noora Saeed Al-Shehhi ◽  
Mohamed Hassan El-Hamawi ◽  
Khalid Al Amari ◽  
Ettore Mirto ◽  
Ahmed Madjidi
Keyword(s):  
Horizontal Well ◽  
Boundary Detection ◽  
Well Performance ◽  
Well Placement

BASS STRAIT DRILLING - PREPARING FOR THE NINETIES

1990 ◽  
Vol 30 (1) ◽  
pp. 300
Author(s):  
B. D. Lake ◽  
V. Santostefano
Keyword(s):  
Horizontal Well ◽  
Polycrystalline Diamond ◽  
Small Field ◽  
High Angle ◽  
Hole Cleaning ◽  
Oil Development ◽  
Drilling Technology ◽  
Logging While Drilling ◽  
The Right ◽  
Polycrystalline Diamond Compact

Future development drilling in Bass Strait will be challenged by small field sizes, thin oil columns and increasing drilling difficulty due to greater hole angle and reach. New drilling technology successfully introduced in the recent Bream, Whiting, Perch and Dolphin developments including Steerable Drilling Systems (SDS), Polycrystalline Diamond Compact (PDC) bits and Logging While Drilling (LWD) tools, coupled with the successful use of jackup rigs for miniplatform development, has given Esso the tools and confidence to meet the development challenges of the 'nineties. Bass Strait's first horizontal well has been successfully drilled and completed with further wells planned in the current Bream development. There still remain some areas requiring improvements, including hole cleaning in high angle holes. Improvements in this and other areas will further improve drilling capability.Given the right incentives Bass Strait drilling technology is well positioned for the challenge of oil development in the 'nineties.

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