Results of research for improving well-killing technology

UDK: 622.276.7

Key words: well-killing fluid, well test, geological-physical conditions, permeability coefficient of restitution, laboratory research

Authors: I.N. Ponomareva, P.Yu. Iluishin, A.V. Lekomtsev, D.A. Martyushev, R.M. Rakhimzyanov (Perm National Research Polytechnic University, RF, Perm)

This article describes how to find some new well-killing fluids for a variety of geological and physical conditions of the Perm region, having a positive experience of practical application in other regions of Russia. Interaction of fluids well jamming with rock-forming minerals and the formation fluids often leads to a deterioration in the filtration reservoir characterization in the invaded zone. As a result, the process is complicated by the well output to the regime, it reduces productivity and performance. We consider examples of the wells in which production decline was probable cause for the negative impact of well-killing fluid on the filtration characteristics of the rock. Comparison of the properties and state of formation zone determined using pressure-processing, obtained before and after the repair. The properties of the remote formation zone determined by standard methods of diagnosis and isolation fracture parameters - by the method of Warren - Ruth, the parameter estimation zone - based on the method of deterministic pressure moments. In laboratory experiments conducted filtration and research in the free volume 5 different damping fluid, which allowed to identify the most effective ones for the conditions of the specific objects of oil deposits of the Perm region. According to the results of laboratory tests in the void volume it found that all damping fluid is inert to the clay minerals and the formation fluids, and does not influence the preparation process oil, and does not cause corrosion of the pipeline equipment intensive. The main criterion for the effectiveness of well-killing fluids adopted the coefficient of permeability recovery. It was found that the investigated damping fluid show quite different results in different geological and physical conditions of the Perm region, which confirms the need for their individual choice in the planning stage repair of wells, taking into account the real geological and physical properties.

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