«Onshore and offshore oil and gas well construction»

Ways to reduce repression on productive formations and preserve their reservoir properties during wells completion

UDC: 622.245
DOI: -

Authors:

¹ Maikop State Technological University, Maikop, Russia
² Kuban State Technological University, Krasnodar, Russia

Keywords: cementing, well, cement slurry, colmatation, reservoir

Annotation:

The authors of the article consider the problems of cementing when constructing oil and gas wells. It is assumed that reducing the hydraulic load on productive formations is a significant reserve for increasing wells productivity. If it is impossible to reduce the repression on the formations as well as to achieve equality of bottomhole pressures, both during drilling and during cementing, the preservation of the reservoir properties of the reservoir can be achieved both through the well-known multistage cementing and the use of lightweight cement slurries. The authors of the article propose the creation of the cement slurry thixotropic structure, implying its expansion, acceleration of setting time or plasticization of the system, eliminating sedimentation of the cement slurry, both of normal density and lightweight, and producing a non-shrinking stone. Such systems have a bridging property, ensure a homogeneous structure of the cement stone along the cement ring height, and high-quality cementing of directional and horizontal wells.

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