METHOD AND DEVICE FOR PRESSURE MEASUREMENT AND DATA TRANSMISSION IN PRODUCTION WELL Russian patent published in 2006 - IPC E21B47/06 E21B47/12 

FIELD: oil production well operation survey, particularly to control productive formation pressure along with information transmission via wireless communication channel.

SUBSTANCE: method involves lowering subsurface pressure gage connected to flow string and to well sucker-rod, wherein the subsurface pressure gage comprises pressure sensor and information transmission device, which transmits information via wireless communication channel; measuring pressure and transmitting information to day surface via wireless electromagnetic communication channel with the use of decompressor having variable base, wherein base length is defined by distance from productive formation roof to end of well sucker-rod filter and magnitude of temperature flow string length change adjusted for geometrical factor equal to 1 - 1.01. Device for above method realization comprises subsurface pressure gage provided with electromagnetic wave transmitter, which transmits electromagnetic waves generated by electric signal sent by decompressor electrically linked to well sucker-rod. The decompressor has variable base and is terminated in electrode located in lower variable base part. The electrode is electrically connected to casing pipe through centrator. Pressure sensor is arranged in electrode body and connected to electronic circuit. Device may be provided with additional pressure sensors connected with each other and forming pressure sensor string. Number of pressure sensors in the array is equal to number of production strings. Pressure sensors may be located opposite to corresponding productive formation center. Pressure sensors may be connected with each other through electric insulators adapted to receive multiple-strand electric cable passing inside the insulators. The pressure sensors may have electrodes electrically linked to casing pipe through centrator.

EFFECT: reduced time of pressure measurement and data transmission.

7 cl, 1 dwg