Geomapping an Oil/Water Contact in a 45-Degree Inclination Well Unleashes Ultra-Deep Resistivity Potential, a Case Study from Kuwait
- Nasser Al Khalifa (KOC) | Mohammed Hassan (KOC) | Deepak Joshi (KOC) | Asheshwar Tiwary (KOC) | Yousef Suhail Al Shammari (KOC) | Nigel Clegg (Halliburton) | Benjamin Clarion (Halliburton) | Alexander Kharitonov (Halliburton) | Li Pan (Halliburton)
- Document ID
- Society of Petroleum Engineers
- SPE Annual Technical Conference and Exhibition, 26-29 October, Virtual
- Publication Date
- Document Type
- Conference Paper
- 2020. Society of Petroleum Engineers
- 3.5 Well Decommissioning and Site Remediation, 5 Reservoir Desciption & Dynamics, 5.2 Reservoir Fluid Dynamics, 5.4 Improved and Enhanced Recovery, 3.6.2 Plugging Materials, 1.6 Drilling Operations, 3 Production and Well Operations, 5.1.5 Geologic Modeling
- Oil Water Contact, Inversion, LWD, Geomapping, Ultra Deep Resistivity
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Through decades of production and water injection, Umm Gudair reservoir fluid distribution have changed significantly, resulting in an increase of uncertainties on fluid levels and subsequent water cuts in production. Different well architectures have been implemented pilot holes, deviated wells or horizontals, but the development of such mature fields comes with inherent difficulties, as offset data does not necessarily reveal the current reservoir properties and fluid contact position. Frequently, costly and time-consuming additional operations such as cement plugs or sidetracks are required to resolve an unforeseen water saturation of the reservoir. However, these methods have a limited efficiency in reducing the water percentage over the time of well production.
In this challenging environment, the Umm Gudair asset has implemented a different approach to well construction built upon the combination of an ultra deep resistivity tool with a previously unattempted benchmarking scenario for a look around inversion. Drilling a trajectory of 45° inclination in order to proactively identify the oil water contact (OWC) in the far field below, and confirm this forecast with an actual resistivity measurement during its penetration. This unprecedented process shows great opportunities in optimizing future well placement and production performances. The main inputs in this success come directly from the capability of the inversion of the electromagnetic measurements in various drilling conditions, as well as a thorough preparation and collaboration between the operator and the service company.
Before implementing this technology, it is critical to assess the expected performance by understanding the different parameters which affect the performance of the tool. The study of the different offsets gave an overview of potential resistivity contrast between fluids and their contact positions. The pre-well study is therefore essential to optimize depth of detection (DOD) versus sensitivity through forward modeling of various frequencies and spacing selections. This phase is also necessary for the team to understand what can be expected from the service with the elaboration of different scenarios based on theoretical tool responses and communication protocol.
This case study shows how an innovative scenario and collaboration between operator and service company reveals a new capability to place a well drilled at mid-angle in the lowest water saturated part of the reservoir using inverted resistivity measurements. The economic benefit and post job analysis conducted post well confirm the promising outlooks of utilizing an ultra-deep resistivity service in a mature field environment.
|File Size||16 MB||Number of Pages||14|
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