Abstract
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.
