用DST资料评价油井污染的新方法及其应用

本文探讨了用DST资料评价油井污染系数的新方法,并将新方法编制成了计算机软件。运用该软件对华北油田五十多井次的DST资料进行了分析,得出了与油井实际情况相符合的结果,将该结果与传统的分析处理方法的结果进行了对比,明显的可以看出,木文方法具有分析结果合理、能反应油井真实污染情况之特点,为油气井的增产措施决策提供了科学依据。

三和南一井污染防治方案

三和南一井是我矿与美国德士古公司在四川雅安区块合作进行的油气勘探项目,德士古公司根据国际惯例,提出了严格的环保要求。为满足德士古公司的要求,我矿根据三和南一井的实际情况,提出了三和南一井污染防治方案,现将该方案作一介绍,以促进我局钻井行业污染防治水平的提高。

水平井的污染特征及污染的解除

水平井段周围污染的分布既不是圆形的，同时也不是沿水平段均匀分布的。渗透率各向异性必然会形成与油井呈正交的椭圆形分布。钻井和完井过程中不同的暴露时间会产生一个截锥椭圆柱体，且其较大的底面靠近水平井的垂直段。同时，在生产过程中，井内的压力分布使得在靠近垂直井段上产生最大的与井眼轨迹正交的压力梯度，因而所引起的污染带也将呈椭圆形，这种污染特征会影响到基质增产处理的效果。在砂岩中，解除的污染将呈椭圆形，如果使用连续油管（推荐使用），增产处理就会产生－改善的绕井“圆环”。对于碳酸盐岩的增产处理，由于它不是仅仅依赖于酸液的流动，而且还依赖于岩石的实际溶解状况，因而，解除的污染带将可能呈圆形。通过对注入过程模拟清楚地说明了污染所最具特征的形状。渗透率各向异性越严重。椭圆偏离于圆形的程度就越大。产量预测表明了污染分布所产生的影响。溶蚀方式和规模（取决于酸液的注入量）对处理后的产量有大的影响。

复合压裂解堵技术的研究与试验

茨榆坨油田茨13，34块边部油层地质状况复杂，原油粘度较高，油井污染问题日益突出，储量难以开发，严重束缚了区块发展。针对这种情况，研究应用了将化学解堵与高能气体压裂相结合的复合压裂解堵技术，取得了较好效果，在常规稠油区块的油井解堵技术方面有了新的突破。

同位素Ba131—GTP微球测井技术在油田开发中的应用

介绍了同位素Ba131—GTP微球测井技术的测井原理,测井工艺及同位素吸水剖面在判断油层污染、分注、调剖及油藏综合调整阶段的应用。

Analysis of Drilling Troubles in Kazhdumi Formation of Yadavaran Oilfield, Iran

Drilling crews of Sinopec have encountered a series of troubles when drilling a formation called kazhdumi of Yadavaran oilfield, Iran in the last few years. The formation is buried in the depth from 3300m to 3500m, mainly including limestone, muddy limestone and some bituminous shale. Many microfissures exist in the formation and the equivalent density of formation pore pressure ranged from 1.19g/cm3 to 1.59g/cm3. Asphalt or heavy oil kicks occurred in drilling three wells in one and a half years, which contaminated the drilling fluid and made well killing difficult due to the kicks and lost circulation in open hole. Gas and hydrogen sulfide （the concentration is up to 40000ppm） were present in the wells, and finally two wells were completely abandoned and one partially losL which frustrated the drilling engineering seriously. By analyzing the data of ＆e drilled wells, the paper summarized the causes of the troubles, and put forward suggestions and conclusions that can serve as reference and guideline for drilling well in ＆is area in the future.

Formation damage control of high permeability sandstone reservoir

The concern on formation damage control of high permeability sandstone reservoir has been growing in oil industry in recent years. The invasion of particles and the filtrate of drilling fluid are proven as one of the key factors accounting for reservoir damage. Based on the ideal packing theory, the practical software has been developed to optimize the blending proportion of several bridging agents, and the core flooding tests were conducted to evaluate return permeability of core samples contaminated with different drilling fluids. Experimental results show that the ideal packing approach can reduce the dynamic filtration rate, improve the return permeability and drawdown the breakthrough pressure, indicating that this kind of drilling fluids can meet the demands of formation damage control for high permeability sandstone reservoirs. Some applying procedures for formation damage control are also proposed in this paper.

SAGD生产现场污染分析与治理

中石油新疆油田分公司风城油田作业区位于新疆准噶尔盆地边缘,属于超稠油油田,目前大量采用SAGD采油技术开发油田,由于SAGD生产技术的特殊性,需要长期注入过热蒸汽,过热蒸汽具有干度高,蒸汽温度高,压力高等特点,对油井生产的要求要高于常规超稠油生产方式,SAGD采油技术在生产井口的表现为压力高、温度高、产液量高,由于生产现场因设备、人员操作等因素,易造成井口污染,在国家大力狠抓环境保护的措施下,解决油井生产造成污染这一问题,是目前需要放在首位的主要工作,本文对现场污染的原因进行分析,找出相应治理手段及方法,达到环保生产的目的。