«Onshore and offshore oil and gas well construction»

Well construction under dynamic conditions of opening by drilling of local inter-salt inter-layers with anomaly high reservoir pressure and low reservoir properties

UDC: 622.248.9
DOI: 10.33285/0130-3872-2023-2(362)-11-14

Authors:

¹ Institute of the Earth's Crust SB RAS, Irkutsk, Russia
² IRNITU, Irkutsk, Russia
³ Irkutsk Scientific Center SB RAS, Irkutsk, Russia
⁴ IF RN-Burenie, Irkutsk, Russia
⁵ RAEN, Moscow, Russia

Keywords: inter-salt formations, drilling fluid, well drilling, abnormally high reservoir pressure, reservoir properties

Annotation:

The results of the analysis of drilling of local inter-salt interlayers with abnormally high reservoir pressure (AHRP) of the fluid system and low reservoir (porosity and permeability) properties (RP) are presented. A method for well construction under difficult conditions has been developed. Efficiency increase of wells drilling and the possibility of continuing drilling in the underlying reservoirs of oil and gas without a significant increase of a well construction time is achieved. The essence of the proposed method is explained, namely drilling through local inter-salt interlayers with fluid’s abnormally high reservoir pressure and low reservoir properties without their isolation, with an increase the drilling fluid density up to 1750 kg/m3, a decrease of the drilling fluid conventional viscosity up to 55 seconds and a decrease of the drilling fluid pH up to 9,0–9,5 with the drilling fluid constant degassing at the wellhead.

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