深水油气勘探救援井精确探测技术研究

Research on precise detection technology of relief wells for deepwater petroleum exploration

深水油气勘探开发已成为石油工业的热点,但井喷等事故时有发生。钻救援井是解决井喷事故的有效方法,其中救援井与事故井相对位置的精确探测是实施救援的关键。利用软件模拟半径为139.7 mm的井喷井,在其附近设置一个1 A电流源和一个接地电极,研究电流源和事故井距离、两电极距离、事故井半径对事故井套管上电流密度的影响。研究结果表明:事故井和救援井距离越近,事故井套管上的电流密度越大,且事故井套管上电流密度最小值的位置点越接近电流源所在处的位置;事故井中电流密度最小值的位置点所在处是由点电流源所在处的位置决定的;事故井半径越小,电流密度的幅值变化就越大,其上的电流密度的幅值也越大。研究结果对海上钻井救援提供了一定的理论依据。

Deepwater oil and gas exploration and development has become a hot spot in oil industry, but accidents like blowout occurfrom time to time. The drilling of relief well is a very effective way to kill a blowout well. How to accurately determine the relativelocation of the relief well from the blowout well is a key to the relief. Using software to simulate blowout well with a radius of 139.7mm, a 1 A current source and a ground electrode were set in its vicinity, then study was conducted on, the effects of the distance betweencurrent source and blowout well, the distance between the two electrodes and the radius of the blowout well on the current density onthe casing in the blowout well. The research results show that the nearer the blowout well is to the relief well, the greater the currentdensity is on the casing in the blowout well, and that the location of minimum current density on the casing in blowout well is closer tothe location of electric current source. The location of the minimum current density in the blowout well is determined by the location ofthe point current source. The smaller the blowout well radius is, the greater the change of current density amplitude is, and the greater theamplitude of its above current density is. The research findings provide some theoretical basis for drilling offshore relief wells.