CASING ANNULAR SPACE PRESSURE CONTROL SYSTEM Russian patent published in 2014 - IPC E21B47/00 

FIELD: oil and gas industry.

SUBSTANCE: invention is related to method and a device for pressure and/or temperature control in one or few annular spaces of well casing in natural deposit without disturbance of well sealing or structure. The device includes a Wireless Sensor Unit (WSU) located outside of the section of non-magnetic casing and including an ambient pressure and/or temperature measuring sensor; at that, WSU can be mounted or positioned at any height of well bore, and power for WSU can be supplied by energy collection. At that, induction signal frequency is within 10-1000 Hz for deep penetration through non-magnetic casing. Sensor Electronics Unit (SEU) is located inside of well bore casing and used for WSU power supply and communication; at that, SEU is mounted on a drill pipe or structure of an equipped well with the use of a pipe with thread, which allows adjusting its height position; at that, SEU converts DC power supplied by cable from surface into AC electromagnetic field providing power supply for WSU located outside of casing. At that, SEU and WSU use electromagnetic modulation for data communication between those components.

EFFECT: accurate pressure and/or temperature control in one or few annular spaces of well casing.

35 cl, 6 dwg