The Machar field, located in UKCS Block 23/26a, contains an estimated STOMP of 290 MMSTB, predominately found in high porosity, low permeability chalk formations. Draped over the flanks of a salt diapir, the chalk formation exhibits a variable degree of natural fracturing depending upon its position on the structure.

Following initial appraisal of the structure, it was clear that to optimise field development, a well designed to intersect with as many natural fractures as possible would offer high well rates while minimising drawdown to aid in reservoir management and recovery optimisation.

This paper describes the use of a stratigraphically high angle well which was drilled to fulfill these requirements. Following discussion of the well’s completion and stimulation design, the field implementation and evaluation will then be reviewed.

The successful high rate damage removal / acid fracturing treatment has led to this appraisal/development well being placed on long term production as part of a pilot scale development of the reservoir.

Keywords:
stimulation, acid, perforation, tracer, upstream oil & gas, stimulation design, drillstem testing, drillstem/well testing, natural fracture, development spe 28 917
Subjects:
Drilling Operations, Pressure Management, Drilling Fluids and Materials, Casing and Cementing, Hydraulic Fracturing, Well & Reservoir Surveillance and Monitoring, Reservoir Characterization, Reservoir Fluid Dynamics, Formation Evaluation & Management, Unconventional and Complex Reservoirs
Copyright 1994, Society of Petroleum Engineers
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