A High-Resolution Chemostratigraphy Application in Carbonates. A case study in the Cretaceous Mishrif reservoir, Minagish Field, Kuwait

Advanced analysis of cuttings (ACA) provides qualitative measurements of the gamma ray spectrum and allows for quantifying of mineral elements for each sample in mud logging. The advancement in technology permits the ACA measurements to be conducted in near real time, which enables integration with the conventional log measurements for the purpose of constructing robust, multi-mineral petrophysical model. The result of the data integration prevails in the petrophysical mineral model. The ability to acquire samples at a higher sampling rate, proper sample treatment and oxides correction, had improved the quality of data acquired from ACA when compared to the initial trials. ACA sample resolution had been improved immensely when compared to the first trial, because it reached the level where it can resolve the layering of the reservoir in the targeted formations. LWD measurements are essential in real-time petrophysical evaluation but slim neutron spectroscopy (NS) tool is not available, and only some contractors have slim spectral gamma ray (SGR). ACA was used to complement the previously mentioned deficiency in LWD technology. A reliable carbonate multi-min petrophysical model was successfully built and implemented in near real time evaluation using ACA and LWD data integration. In addition, the ACA has the advantage of acquiring the SGR and NS in high temperature (>320°F) slim (<4 inches) hole. As a result, the combination of ACA and wireline logs were used to evaluate a deep reservoir. The ACA is more cost effective when compared to similar measurements from conventional logs. This paper discusses the ACA and its integration with conventional log data for petrophysical interpretation of the carbonates and clastics formations, respectively. The availability of SGR and NS are very important in complex lithology evaluation. This case study shows that advanced mudlogging data integrated with standard logging measurements, assisted in building enhanced petrophysical model, where the SGR and NS logging measurements were absent.

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A Dynamic Shift in Stimulation and Completion Strategy to Develop the Complex Mishrif Reservoir of Minagish Field, Western Kuwait

Al-Sabea,

Patra,

Ziyab

et al. 2023

Day 2 Wed, September 13, 2023

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One of the most complex reservoir structures in Kuwait is the Mishrif reservoir in the Minagish field of western Kuwait. This depleted reservoir is composed of multiple heavily faulted compartments, each trending in different directions and with varying depth extensions. Earlier production was heavily dependent on these faults. Of late, a dynamic change in approach is under study to maximize the sustained oil production. Recent findings from multiple openhole horizontal laterals crossing Mishrif using production logging tools and dynamic temperature survey enabled identification of some major faults as thief zones and not contributing to production. In extreme cases, mechanical isolation is necessary to overcome the losses and allow the well to produce. An openhole multistage completion (MSC) with extensive packer placement was deployed in a well in the central geographic area of the Mishrif crossing multiple faults and natural fractures. This was to study and to maximize the production potential after hydraulic acid fracturing. The combination of appropriate logging analysis, completion design, and hydraulic acid fracturing design were all key to the well production success. The subject well is the first MSC with the faults mechanically isolated and the production relying on the fractures. All stages were completed in a record 5 days with multiple onsite decisions to control the fluid leakoff during the treatments. Due to the degradable balls with the MSC, milling operation was not required. The stabilized production result of approximately 800 BOPD achieved the target. The dynamic changes in production over time can cause a complete shift in reservoir development strategy for the Mishrif reservoir. This is particularly due to the reservoir being highly faulted, complex, tight carbonate and highly depleted in nature. This paper describes the strategies used in multiple wells that led to a successful design and completion of the subject well.

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A High-Resolution Chemostratigraphy Application in Carbonates. A case study in the Cretaceous Mishrif reservoir, Minagish Field, Kuwait

Cited by 4 publications

References 0 publications

Novel 3D seismic characterization of upper Cretaceous formations along the Arabian plate: A case study

Novel 3D seismic characterization of upper Cretaceous formations along the Arabian plate: A case study

Enhanced Petrophysical Evaluation in Complex Lithology Using Advanced Analysis of Cuttings Data: A Case Study from Saudi Arabia

A Dynamic Shift in Stimulation and Completion Strategy to Develop the Complex Mishrif Reservoir of Minagish Field, Western Kuwait

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