A thermomechanical technology of borehole wall isolation using a thermoplastic composite material

Abstract

Loss of drilling fluid in wells is one of the most important drilling challenges. To prevent this problem an insulation of borehole wall is requiring. The results of study of an innovative technology of isolation of borehole using a new thermomechanical plugging material are presented herein. The material considered is solid composite consisting secondary polyethylene terephthalate and gravel. Theoretically and experimentally shown the possibility to use this material to borehole isolation. The technology of manufacturing and isolation of absorbing horizons by thermomechanical material has been developed. Dependence of the regime parameters of thethermomechanical process melting of material on the thermophysical properties and technical characteristics was established. Dependence of the penetrating ability of material melt on the fractures was established. The results of work can be used to recommend technology parameters providing the efficient melting rate.

The modern interpretation of the high-flow gas wells study results

“…where P bot -current bottomhole pressure after shutdown, Pa; P bot 0 -bottomhole pressure under conditions of stationary gas or gas condensate inflow before stopping the operation of the well, Pa; P atm -atmosphere pressure, P atm = 0.1013027•10 6 Pa; Next, is found the summary radius of the well [18,19]:…”

Substantiation of Thermomechanical Technology Parameters of Absorbing Levels Isolation of the Boreholes

“…As the result of analysis of well-known physical-and-mechanical properties of PET, it is possible to apply it as binding material for absorbing levels isolation of boreholes [13][14][15]. Secondary PET.…”

“…During laboratory examinations of physical and mechanical properties of TCM [12][13][14][15][16][17][18][19][20]: -the necessity of filler entering into its composition is substantiated. Secondary PET in the molds was collapsed due to radial deep cracks formation.…”

“…Drilling of both exploration and exploitation boreholes for exploration of deposits and extraction of minerals in the area of iron-ore and coal basins is conducted in a high degree of development and metamorphism, in strong and fractured rocks [1][2][3][4][5][6][7][8][9][10]. Rocks of mined levels are in complicated stressed state [11][12][13][14][15][16][17][18] that during construction of mine workings only complexify the technology of their installation [19][20].…”

“…A significant proportion of the time and funds is spent on drilling of boreholes absorption. Absorption leads to disruption of drilling process mode, boreholes walls integrity, provokes accidents [10][11][12][13][14][15][16][17][18][19][20].…”