The paper gives successful practices of casing leak repair using fiberglass scab liner in RN-Purneftegas LLC. The scope of the method effective application and criteria of selection of wells candidates are defined. Fiberglass scab liner solves the same problems as steel scab liner but the first one has much higher corrosion resistance and could be easily withdrawn by drilling-out. In total fiberglass scab liners installed in six wells, the technology allowed to produce more than 12 thousand tons of incremental oil, in three wells effect continues. The pilot introduction stages of the technology on the example of the well of Tarasovskoye field are given. In the well of Komsomolskoye field reserve recovery drawn have led to the need for well re-completion by sidetracking. During this fiberglass scab liner was successfully drilled, confirming the possibility of withdrawing it from the well if necessary. The analysis of outcomes of the carried-out works allows to draw a conclusion on applicability fiberglass scab liner for isolation of extended untight sites of casing string. The disadvantages of the technology include the inability to set packer equipment in the scab liner during subsequent well intervention. The advantage of the technology include the possibility of a prolonged operation of wells in conditions of high corrosiveness of the produced product, running downhole standard tools, drilling scab liner if necessary (e.g., in case of mechanical damage, detection of a new interval of casing leak, sidetracking in the previously isolated interval).
References
1. Nigmatullin T.E., Presnyakov A.Yu., Strizhnev V.A., Nikishov V.I., Casing leak repair using fiberglass scab liner (In Russ.), Nauchno-tekhnicheskiy vestnik OAO “NK “Rosneft'”, 2013, no. 2, pp. 44–47.
2. Utility patent no. 125620 RF, MPK E21V 29/10, E21V 33/13, Ustroystvo dlya remonta ekspluatatsionnoy kolonny ili selektivnoy izolyatsii plastov (Device for repair of production string or selective isolation of layaers), Inventors: Nikishov V.I., Bochkarev V.K., Kamenev A.N., Mamedov T.M., Malykhin I.A., Solov'ev Yu.S., Yakovlev S.S., Presnyakov A.Yu., Nigmatullin T.E.
