Field development costs have risen with oil price. A resulting challenge with Arab heavy oil developmentremains how to generate competitive advantages through deploying efficient technological innovationsand making cost-effective solutions a crucial part of a firm’s strategy for rigless interventions. With strictcommitments to environmental protection, the need for operational excellence and several processimprovements necessary to yield dividends in the form of safe project delivery and to overcome severaltechnical difficulties is vital.The scope of the paper is to examine coiled tubing (CT) stimulation and logging technologies used inthe timely project execution of one of Saudi Arabia’s largest field developments to cost effectivelyenhance matrix stimulation success. Some of these solutions include technologies for CT reach, CT accessfor dual laterals, acid placement optimization, and treatment effectiveness monitoring. CT extended reachsolutions comprised tapered CT strings designed for ultradeep wells, drag reducers, tractors, and vibrators.Technologies for CT access for dual laterals include a flow activated multilateral tool for CT matrixstimulation employing pressure variation telemetry with bottom hole pressure (BHP) and casing collarlocator / gamma ray (CCL/GR) for high success lateral identification.To optimize acid placements, distributed temperature survey and pressure measurements are used toenhance diversion and acid placements. A blend of tools assisted to monitor, analyze, and adjust inreal-time the reservoir and stimulation fluids interaction. Viscoelastic diverting acid is designed toviscosify in situ as the fluid spends on the reacted formation for chemical diversion in carbonates. Theconcentration of the diverter was optimized from 20% HCl to 15% HCl. A unique solution for monitoringtreatment effectiveness evolved to include real time production logging using single strings for CTstimulation and real time profiling instead of memory logging. This solution required less equipmentmobilization and no wireline unit. Intervention from 99 producers and injectors reveals operational andcost benefits from deploying technological solutions and justifies the degree to which each technologysolution fits the overall field development strategy.The implications of deploying these solutions include reduction of well counts from the originalestimates in this field development to offer manageable total field development costs.
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