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Abstract

Although engineers have employed tractor interventions relatively extensively in well stimulation of extended reach wells in this field, an outstanding challenge in the field and even in the industry has been to conduct real-time acquisition of inflow or production profiles and to evaluate treatment effectiveness in extended reach open hole horizontal wells. This challenge was overcome from real-time electrical to optical (EtO) water injection profile measurements simultaneously with running a tractor. The motorhead assembly (MHA) of coiled tubing (CT) was successfully wired through a tractor to allow the world’s first successful real-time acquisition of an inflow profile in an extended reach open hole horizontal power water injector in one of the current largest field development projects in the world. The well, located on one of two finger islands, was completed to a total depth of nearly 30,000 ft (over 9.10 km) MD; making it the deepest open hole section logged in the field development outside the normal reach of tapered CT for well intervention. The intervention on the well was successfully carried out through the application of a 2-in. tapered CT and well tractor. The well’s treatment involved 3,850 barrels of emulsified acid recipe in 14 stages. A comparison of the pre- and poststimulation injectivity indices showed an eightfold injectivity index improvement from 53 bpd/psi to 400 bpd/psi. The resulting marked improvement in injectivity from acid stimulation also revealed the benefit of informed decisions from the real-time fiber optic distributed temperature sensing (DTS) in fluid placement. Effective stimulation was critical for increasing injectivity and creating conductive flow paths between borehole and the reservoir. Relatively good transmissibility between the injectors and producers during the commencement of a field-wide waterflood was crucial because of a relatively high viscosity tar layer between the overlaying oil column and aquifer. This tar layer was a challenge for assuring adequate aquifer support to the producers because of their partial sealing nature. For reasons of optimizing sweep and recovery, the placement of water injection wells and requirements was focused around the flanks of the structure. The ability to employ real-time information to effectively stimulate and log inflow profiles in extended reach wells has provided assurance that stimulation can serve as a technical and an economic solution for addressing the relatively high skin damage post drilling and completion. Other practical applications of the success outcome from the real-time acquisition of inflow profiles includes the reduction in the transmissibility uncertainty between the producers and injectors in the field development partly because of the availability of better quality data for reservoir simulation or characterization purposes.

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/content/papers/10.3997/2214-4609-pdb.350.iptc16665
2013-03-26
2021-10-21
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http://instance.metastore.ingenta.com/content/papers/10.3997/2214-4609-pdb.350.iptc16665
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