Selection of grouting compositions for water shut-off in low-permeability intervals

UDK: 622.276.76
DOI: 10.24887/0028-2448-2019-6-94-98
Key words: repair and isolation works, low-permeability intervals, fine particle mineral composition, laboratory testing, water cut
Authors: V.A. Shaidullin (RN-BashNIPIneft LLC, RF, Ufa), E.A. Levchenko (RN-BashNIPIneft LLC, RF, Ufa), O.I. Valieva (RN-BashNIPIneft LLC, RF, Ufa), I.A. Akhmerov (Bashneft-Dobycha LLC, RF, Ufa)

In connection with the increase in the number of highly watered production wells and wells in unsatisfactory technical conditions, new plugging-back methods and technologies are required. One of the current trends in the development of new plugging-back technologies is the use of cements based on special additives that can increase the effectiveness of repair and insulation works.

The article provides information on the characteristics and properties of new cement slurries for repair and insulation works. The main requirements when choosing these compounds were the following: high filtration capacity, good adhesion to rock, cement stone and metal, increased strength of the stone, low water loss and temperature limit of applicability. The authors discuss a fine-grained mineral mixture with a minimum grain-size composition, a modified composition based on magnesian components, shuttered in a liquid, with the addition of magnesium salts and ionic surfactants, and a ceramic composition based on an organosilicon mixing fluid. To improve the efficiency of squeeze jobs laboratory tests and field trials have been performed with new cement compositions to isolate low permeability beds, unsealed intervals and behind-the-casing channeling on the fields Bashneft-Dobycha LLC. It is presented the analysis of workover operations, criteria for selecting candidate wells, techniques, tools and solutions for running a squeeze job, the integrated application of which secures well integrity and its reactivation with minimum achievable water cut and maximum possible oil flow rate accompanied by long-lasting isolation effect. The evaluation of the effectiveness of the work carried out using the data of cement slurries and the optimal conditions for their use.


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