塔河油田177.8mm尾管注水泥技术研究

发布时间：2018-06-07 07:57

本文选题：低密度 + 粉煤灰　；参考：《西南石油大学》2015年硕士论文

【摘要】：为缩短钻井周期和节约成本,塔河油田普遍采用简化井身结构,但随之出现了长封固段、长裸眼段固井的难题。虽然为了解决长封固段固井漏失的问题,采用了尾管固井、双级固井等工艺技术,但未能取得很好的效果,没有从根本解决固井漏失的问题。由于地层承压能力低,常规密度水泥浆容易在施工中发生漏失,并且封固段较长,上下温差大,水泥浆强度发展极不均匀,导致固井质量较差,给后期作业带来系列问题,缩短了油井开采时间,造成巨大的经济损失。因此,为了提高固井质量,降低固井漏失风险,根本上要从水泥浆体系入手,降低水泥浆的密度。通过分析塔河油田十二、跃进等区块的固井现状,了解了区域固井的难点并提出了相应的提高固井质量的措施。针对塔河油田地层承压能力低、封固段长的特点,研究了适合该地区的密度为1.50g/cm3的粉煤灰低密度水泥浆体系,其流动度、失水、稠化时间、抗压强度、流变性等性能均能满足施工要求。粉煤灰低密度水泥浆体系密度易于调节,便于现场施工,在温度较低的情况下能有较高的早期强度,适合用于低温、低压、易漏地层的固井。该水泥浆体系不仅可以解决塔河油田固井质量差的问题,而且对其他类似区块复杂深井固井水泥浆体系的研究也有重要的指导意义。
[Abstract]:In order to shorten the drilling cycle and save the cost, the simplified well structure is widely used in Tahe Oilfield, but the problems of long sealing section and long open hole section are appeared. In order to solve the problem of cementing leakage in long cementing section, the technology of tail-pipe cementing and two-stage cementing has been adopted, but it has not achieved good results and has not solved the problem of cementing leakage fundamentally. Due to the low bearing capacity of formation, the conventional density cement slurry is easy to leak in construction, and the sealing section is longer, the temperature difference between upper and lower is large, the strength of cement slurry develops very unevenly, which leads to poor cementing quality and brings a series of problems to the later operation. The oil well production time is shortened, resulting in huge economic losses. Therefore, in order to improve cementing quality and reduce the risk of cementing loss, it is essential to start with cement slurry system and reduce the density of cement slurry. Based on the analysis of cementing status in areas 12 and Yuejin of Tahe Oilfield, the difficulties of regional cementing are understood and the corresponding measures to improve cementing quality are put forward. In view of the characteristics of low pressure bearing capacity and long sealing section in Tahe Oilfield, the fly ash low density cement slurry system with density of 1.50g/cm3, which is suitable for this area, is studied. Its fluidity, water loss, thickening time and compressive strength are studied. Rheology and other properties can meet the construction requirements. The density of fly ash low density cement slurry system is easy to adjust and field operation. It can have high early strength under low temperature and is suitable for cementing formation with low temperature, low pressure and easy leakage. The cement slurry system can not only solve the problem of poor cementing quality in Tahe Oilfield, but also have important guiding significance for the study of complex deep well cementing slurry system in other similar blocks.
【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE256

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