高温井下毛细管测压仪设计

文章以油井压力测量为例,介绍了四种油井压力测量方法,分析了每种方法的适用条件及优缺点。以现有的毛细管压力测量仪为例,以迭代算法及克拉柏龙方程算法为基础,分析了在不同的温度、压力条件下两算法测压偏差值及每种算法适用的井况条件,不同井况条件下仪表测压算法方案优选。以SAGD井实际情况为例,以迭代算法为核心,以单片机及外围器件为硬件,C51为软件基础,设计完成适用于井口、井底温差较大情况下的毛细管测压仪。仪表实现RS232数据远传、仪表自标定功能。

DESIGN OF HIGH TEMPERATURE DOWNHOLE CAPILLARY LOADOMETER

Four measuring methods of oil well pressure were introduced, advantages and disadvantages and the applied conditions of each method were analyzed. Taking the existing capillary pressure measuring instrument as example, based on the iterative algorithm and Carat BaiLong equation, the measuring pressure difference of two algorithms was analyzed under the condition of different temperature and pressure and the suitable well conditions on each algorithm were studied. Taking SAGD well as example, the capillary pressure measuring instrument suited for wellhead and bottom hole with large differential temperature was developed by taking iterative algorithm as core, the single-chip microcomputer and peripheral devices as hardware, and C51 as software. The instrument could realize the data remote transmission through RS232 and the function of self calibration.