抽汲井试井分析数学模型的建立及精确解

根据抽汲井试井工艺过程及其特点,采用已知上一次抽汲结束时的地层压力分布规律建立下一次抽汲数学模型的方法,建立了抽汲井试井分析数学模型,并在Laplace空间求解出了相应的精确解。将这一成果应用于长庆油田之中,结果表明:该理论能描述抽汲井的井底压力瞬变性及抽汲期井底压力变化无规律性的特征,符合实际测试工艺情况,弥补了抽汲井试井这一空白;提高了该类井试井的解释率和解释结果的可信度。同时,利用该理论还可计算抽汲过程中任一时刻的井底压力和关井时刻的井底压力,解决了抽汲井难以计算关井时刻井底压力的问题。

INVESTIGATION ON THE MECHANISIM OF METHYL SULFONIC PHENOLRESIM CONTROL OVER FLUID LOSS

In this paper it has been proven that the fluid loss control of SMP primarily results from the improvement of mud-cake quality. The permeability K has been measured as an important factor of judging mud-cake quality.We have studied the changes oft heads or bed amount with temperature，salt content in the medium and PH value，as well as the relations between adsorbed amount and Water between loss of drilling fluid in the corresponding conditions. Particularly, the influence of the. NaCI content in the medium on the absorbed amount，the particle size distribution of clay in mud cake before and after SMP is mixed with SMC has been studied, hence a mutually relationship between these factors has been found.The mechanism of the anti-temperature and anti-salt properties of SMP lies in its quite strong thermal stability and hydrophilic power，as well as in its effective adsorption onto the surface of clay in the condition of high temperature and large salt content . when it is mixed with SMC or complexed with multivalent cations，such as Cr³⁺ thus, a stable protection for fine colloidal particles in such conditions is achieved