新型钻井液加重化学剂在石油钻井中的应用

Application of New Drilling Fluid Weighting Chemicals in Petroleum Drilling

在石油钻井中,通过在钻井液中适当增添加重材料可以更好地控制井筒压力。传统的加重材料例如碳酸钙、重晶石等虽然可以有效地提升钻井液的密度,但是也同样会存在地层损坏、颗粒沉降、井筒腐蚀等一系列问题,亟需一种新型的钻井液加重材料保证石油钻井作业的正常进行。因为目标作业区使用油基钻井液,所以使用硫酸钙作为加重化学剂是一个较为良好的选择。硫酸钙作为一种成本低廉、较易制备的化学材料,在研究中通过密度、流变性、滤失量等多项实验将其作为油基钻井液的加重材料进行可行性研究,并与传统的加重材料(碳酸钙、重晶石等)进行比较,硫酸钙在实验中以3种不同质量浓度(0.06、0.120、0.165 mg·L^(-1))混合在基础钻井液中。结果表明:硫酸钙与在0.12 mg·L^(-1)的相同质量浓度下测试的其他加重材料相比,更好地控制了钻井液损失,证明硫酸钙是一种良好的钻井液加重材料。

In oil drilling,adding weighting materials appropriately to the drilling fluid can better control wellbore pressure.Traditional weighting materials such as calcium carbonate and barite can effectively increase the density of drilling fluids,but they also face a series of problems such as formation damage,particle settling,and wellbore corrosion.There is an urgent need for a new type of drilling fluid weighting material to ensure the normal operation of oil drilling operations.In this study,due to the use of oil-based drilling fluid in the target operating area,using calcium sulfate as a weighting chemical agent is a good choice.Calcium sulfate,as a low-cost and easy to prepare chemical material,was used as a weighting material for oil-based drilling fluids in feasibility studies through multiple experiments such as density,rheological properties,and filtration loss.It was compared with traditional weighting materials such as calcium carbonate and barite.Calcium sulfate was mixed in the basic drilling fluid at three different mass concentrations(0.06,0.120,0.165 mg·L^(-1))in the experiment.The results showed that calcium sulfate better controlled drilling fluid loss compared to other weighting materials tested at the same mass concentration of 0.12 mg·L^(-1),proving that calcium sulfate is a good drilling fluid weighting material.