Thanks to the development of new technologies and tools in the field of oil and gas wells drilling unconventional hydrocarbons that were previously considered economically unviable can be produced today. The use of rotary steerable systems (RSS) in well construction made possible the development of a number of offshore fields in the region of Sakhalin Island, Tazov Bay and the Baltic Sea.
Use of RSS for drilling wells with a large deviation from the vertical on shore is promising trend of the construction of wells with a long horizontal section along the productive formation. the approach to existing systems for the development of hydrocarbon deposits on land can be revised. The use of such wells allows to engage in the development of much more reserves of the field, using fewer number of wells than when applying traditional approach, and reduce of capital investments.
For cementing of casing in areas of wells with a zenith angle of more than 55° at the intervals of productive formation, the cement slurry is subject to increased requirements for rheological and fluid flow characteristics, as well as for sedimentation stability. For this purpose, laboratory studies of a number of polymeric reagents based on polysaccharides as modifying additives to cement slurries were carried out. As a result of research, the dependences of changes in flowability, water loss and plastic viscosity on the concentration of polymers in the cement slurry in three temperature ranges were obtained. The analysis of the results of laboratory studies showed that among the tested polymers Natrosol 250 HHR reagent is characterized by the best combination of water retention and rheological properties. It is established the working concentration of the polymer reagent in the cement slurry should be in the range of 0.15-0.30%. It is noted that plastic viscosity can be decreased by entering plasticizing additives into the cement slurry.
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