• Makienko, Vladimir
• Valiullin, Albert
• Mast, Michael
• Mazitov, Marat
• Lahman, Matthew
• Chaburdo, Pavel
• Astafyev, Vladimir

Abstract

<jats:title>Summary</jats:title><jats:p>Development of hard-to-recover reserves in Russia necessitates the development of new technologies and use of those technologies for efficient production of hydrocarbons. One such technology is multistage fracturing in horizontal wells. Beginning in 2010, such technologies have been widely used in many regions. A liner with swellable or hydraulic packers for separation of intervals and fracture ports opened with balls or actuated with the help of coiled tubing is the simplest and most economically effective method for completion of horizontal sections of boreholes. Well production using multistage fracturing helps maximize initial flow rates and hydrocarbon extraction; however, production declines over time can be significant and, in some cases, it is necessary to perform repeated reservoir stimulation treatments to maintain an economic production level. Refracturing wells with shifting sleeves is complicated because it is necessary to perform selective interval isolation for the target interval treatment. Mechanical isolation involves special tools for well treatment and fracturing, which significantly increases the cost and duration of treatment. Multistage fracturing fluid diversion, with the help of biodegradable diverting agents, is widely used in unconventional reservoirs but has not been used effectively in reservoirs with relatively high permeability. The method discussed in this work is based on injection of a degradable diverting agent, sealing of highly permeable intervals, recovery of permeability of existing fractures, and formation of new hydraulic fractures. This technology does not require any special tools and substantially reduces treatment time. However, such specific technology requires adjustment and calibration to particular formation conditions and completion types. This paper describes the flow diversion multistage refracturing technology tested at Las-Eganskoye field. The technology was tested in formations with relatively high permeability. Results of well treatment and testing allowed for assessing key process procedures and developing measures aimed at adjusting the method to field conditions.</jats:p>

Topics

• impedance spectroscopy
• extraction
• permeability
• laser absorption spectroscopy