Justification of technologies to control fluid loss during remedial cementing in the fields of RN-Purneftegas LLC

UDK: 622.276.7
DOI: 10.24887/0028-2448-2022-10-48-54
Key words: fluid loss contol, remedial cementing, review, field experience, instant filtration compound, plugging compound, laboratory tests
Authors: V.Yu. Nikulin (RN-BashNIPIneft LLC, RF, Ufa), A.R. Shaimardanov (RN-BashNIPIneft LLC, RF, Ufa), R.R. Mukminov (RN-BashNIPIneft LLC, RF, Ufa), T.E. Nigmatullin (RN-BashNIPIneft LLC, RF, Ufa), G.I. Apkarimova (RN-BashNIPIneft LLC, RF, Ufa), B.M. Gabbasov (RN-BashNIPIneft LLC, RF, Ufa), I.B. Davletberdina (RN-BashNIPIneft LLC, RF, Ufa), A.E. Andreev (RN-Purneftegas LLC, RF, Gubkinsky), A.F.Abdullin (RN-Purneftegas LLC, RF, Gubkinsky)

Squeeze jobs on Pokur suite at the fields of RN-Purneftegas is complicated by fluid loss in water-gas bearing and depleted formations. Thus, technological efficiency of remedial cementing with application of basic technology based on cement and oil-cement slurries does not exceed 27%. In this connection, the selection of alternative plugging materials specially designed to control losses was carried out. Special attention is paid to the following conditions and peculiarities of the materials application: applicability at loss rate of 18 m3/h and more; possibility of pumping through perforation holes or production casing leakage; possibility of preparation with standard equipment at oilwell service and workover crews; positive experience of application in Rosneft Oil Company; possibility of supplementing with cement slurry. On the basis of the analysis of field experience of application of technologies and reagents for losses control available for service companies rendering services of workover operations at the Russian market, three potentially effective technologies were selected: two based on the compositions forming a filtration crust on the rock surface and one forming a screen in the formation on the basis of a reinforced polymer composition. During laboratory testing of the selected technologies, the physical-chemical and technological properties of the materials were determined. Particular attention was paid to assessment of colmatage ability of compositions and risks during pumping through perforation holes and through defects in the production casing. Thus, in the course of this work field experience of fluid loss control is studied, the choice of appropriate promising technologies for the complex of laboratory testing is justified. According to the results of laboratory testing it is established that all the studied compositions have the potential to combat losses in the highly permeable (about 1 Ојm2) pore reservoir.

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