Interface monitoring placement system

摘要

The present invention relates generally to the treating of wells, and more particularly to a method and device that are capable of detecting the position of a fluid interface so that a well treatment can be placed with greater along hole depth precision in a given hydrocarbon producing well than previously. More particularly, an embodiment of the invention includes a method for accurately placing a well treatment fluid in a well, comprising: pumping a first fluid into a first part of the well until an interface is formed between the first fluid and a second fluid; extracting information regarding at least one fluid property of the first and second fluids with first and second to sensors positioned in the first and second fluids respectively; and exchanging information between the first and second sensors and a telemetry unit. The invention also includes a downhole tool for positioning a fluid interface in a well bore, comprising: first and second sensors, the spacers being spaced apart such that they span the fluid interface; the first sensor measures a first fluid property and the second sensor measures a second fluid property; a first fluid port on the same side of the first sensor as the spacer and in fluid communication with a first fluid flow line; and a second fluid port on the opposite side of the first sensor as the spacer and in fluid communication with a second fluid flow line.