INTRODUCTION OF PRESSURE MEASUREMENT SYSTEM WITH CAPILLARY TUBING

It kept being a problem to monitor the downhole pressure in mechanical oilrecovery wells, esp. in wells with electric pumps. The pressure measurement system with capillary tubingwas regarded as a method of pressure measurement under pump, its principle, composition and the way of installation were introduced in brief. Inert gases were used as pressure transmitting medium by the system. There is no easy-damage component because the pressure chamber was run to the pressure measurement point. The pressure of inert gases inside the pressure chamber is equal to the pressure of well fluid outside the barrel,it was transmitted onto the surface by the inert gases inside capillary. So the pressure of well fluid at the pressure measurement point is the sum of the pressure of inert gases which can be read directly from the surface and the pressure of gases inside capillary tubing. Because of these characteristics, the pressure measurement system with capillary tubing can be used without depth limit and can measure the downhole pressure continuously without time limit.