Gravel-Pack Shutoff Using Deep Penetrating Squeeze Cement System in the Gullfaks Field

Abstract

TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractExcessive water production is an increasing environmental problem in mature oil fields in the Norwegian sector of the North Sea. Throughout the past 10 years, several mechanical and chemical water-shutoff solutions have been developed and implemented with variable success. For chemical water shutoff, the two major challenges have been placement optimization and choice of a technically feasible system. A cement squeeze is traditionally the most usual means for permanent isolation of a naturally perforated section. Cement is often the preferred solution because of its well-established properties and proven performance. An increasing problem has been water production in gravel-packed wells. Chemical shutoff in a proppant pack cannot easily be achieved with standard cement slurries or specialized squeeze slurries because of the risk of bridging and incomplete placement. A polymeric system can be easily placed in a proppant pack, but there is a concern regarding the systems ability to withstand high differential pressure following onset of production.A water-shutoff treatment utilizing deep penetrating squeeze cement slurry is presented for the isolation of a highly permeable gravel pack. The objective of the treatment was to eliminate the negative impact on the environment caused by production from a formation with 100% water cut and to initiate new production from an oil-saturated layer immediately above the producing formation. To access the desired interval, one would have to perforate through a section of blank pipe in the existing gravel pack. The perforation could be easily achieved; the challenge was to prevent continued production influx from the gravel pack producing with 100% water cut prior to the water-shutoff treatment.The evaluation of the treatment has provided valuable information and qualified a new technique for water shutoff in gravel-packed completions. Benefits from this treatment are reduced negative impact on the environment through reduction in the volume of produced water and increased oil recovery.

Análise técnico-econômica do canhoneio de poços do pré-sal brasileiro utilizando diferentes métodos de condução do canhão.

“…The operator will determine if the well will be a producer or an injector, if the perforation is to enable fracturing hence the stimulation (FU et al, 2018;JHA et al, 2020), or if the well will flow from the channels derived from the jet perforation (SHAYKAMALOV et al, 2020). The perforating goal might just be to enable a cementing correction through a squeeze operation (COWAN, 2007;JOHANNESSEN et al, 2000) or pressure relief using shallow puncher charges (PANFEROV et al, 2016). In these last two cases, the objective is part of an intervention operation.…”