Search

In nearly all oil and gas deposits of Kazakhstan well drilling is connected with overcoming the great difficulties encountered at drilling powerful easily dispersible clay deposits of various compositions. During drilling in nearfield under the action of the aqueous filtrate drilling fluids such clays swell, causing narrowing of the walls of boreholes with subsequent formation of caliper logs. These complications lead to a considerable loss of time and money on drilling operations. Thus it is necessary to ensure reduction terms of well construction by increasing their quality, a significant reduction in labor and material costs. To solve assigned tasks it is necessary to perform a significant amount of drilling in a variety of geological conditions with high technical and economic indicators by improving technologies of well drilling. Thus great attention has to be paid to improving the stability of the borehole walls in unstable rocks, as one of the factors contributing to the increase of technical and economic indicators of drilling during the development of the great depths in the complicated conditions. Usually try to take into account the effect of the swelling of clay rocks on the course and results of drilling in the design and construction of boreholes, having to use drilling fluids of nondispersive type. Thus it is important to have in advance data of direct experimental evaluations of swelling of drillable rock samples in aqueous media of different component composition. Purpose of the work - to find optimal composition of inhibiting drilling fluid with low content of clay with the usage of polymers of new generation for drilling in easily dispersible clay rocks in deposits of Kazakhstan. [ABSTRACT FROM AUTHOR]