Repair and isolation works associated with the operations of recementing and waterproofing

Abstract

The paper deals with the operations related to the recementing and waterproofing of the open water-gas interval after the perforation works of a well drilled in Bulla-deniz field carried out simultaneously with the state-of-the-art methods. The wells drilled in Bulla-deniz field are one of the most complicated ones in the Caspian region. The drilling of the areas, which require high density, as well as the isolation of IV horizon and the zones of high pressure via the tailpipe, prevented such issues as the drilling mud losses and catching of the drilling tool. The modern method of packering and the recementing operations employed while conducting repair and waterproofing are described in the paper in detail. Moreover, in the well with high pressure and temperature drilled in Bulla-deniz, the methods of recementing and waterproofing were used. The paper provides the graphs and tables developed with the purpose of preparation of simulation programs prior to the cementing operation and conformance checking of the simulation program of reality during the operation. Furthermore, the scheme of well completed, the risks that may occur during repair-waterproofing works and the methods of their prediction were studied.