李雄, 刘贵传. 基于特性菱形图的钻井液用膨润土优选方法[J]. 石油钻探技术, 2018, 46(4): 59-64. DOI: 10.11911/syztjs.2018108
引用本文: 李雄, 刘贵传. 基于特性菱形图的钻井液用膨润土优选方法[J]. 石油钻探技术, 2018, 46(4): 59-64. DOI: 10.11911/syztjs.2018108
LI Xiong, LIU Guichuan. An Optimization Method for Bentonite Used for Drilling Fluid Based on Characteristic Diamond Diagram[J]. Petroleum Drilling Techniques, 2018, 46(4): 59-64. DOI: 10.11911/syztjs.2018108
Citation: LI Xiong, LIU Guichuan. An Optimization Method for Bentonite Used for Drilling Fluid Based on Characteristic Diamond Diagram[J]. Petroleum Drilling Techniques, 2018, 46(4): 59-64. DOI: 10.11911/syztjs.2018108

基于特性菱形图的钻井液用膨润土优选方法

An Optimization Method for Bentonite Used for Drilling Fluid Based on Characteristic Diamond Diagram

  • 摘要: 现有评价钻井液用膨润土的方法测试项目较多、测试评价周期长、工作量大,且相关的标准大多局限于膨润土的常温性能,缺少针对高温高密度钻井液用膨润土的优选方法。针对这些问题,在分析膨润土品质与膨润土造浆率、膨润土浆流变性和滤失量等性能参数之间内在联系的基础上,提出了基于特性菱形图的膨润土优选方法。该方法考虑了温度对膨润土性能的影响,通过试验测试膨润土的造浆率和膨润土浆在老化前后的塑性黏度、动切力和滤失量等参数,拟合出塑性黏度、动切力和滤失量与膨润土加量的关系式,并将计算出的性能参数与参考膨润土的性能参数对比,绘制特性菱形图计算膨润土的品质。利用该方法计算了5种膨润土样品的品质并进行了排序,5种膨润土样品品质的高低顺序与使用这5种膨润土配制钻井液性能好坏的顺序一致。这表明,利用特性菱形图法优选钻井液用膨润土的可靠性较高。

     

    Abstract: Currently,evaluating bentonite used for drilling fluid is complicated because it may involve a large number of testing items,and an arduous process of testing and evaluation,where the evaluation period is long and the workload heavy.Most relevant standards focus on the properties of bentonite at room temperature,but we still lack methods that optimize bentonite used for high temperature and high density drilling fluid.To solve these problems,a method for optimizing bentonite based on a characteristic diamond diagram was proposed. It is based on analyzing the internal relations between performance parameters such as quality and yield of bentonite,rheological property and filter loss of bentonite slurry.In this method,the influence of temperature on the properties of bentonite was taken into account.Researchers tested the yield of bentonite and the plastic viscosity,yield point and filter loss of bentonite slurry before and after aging.After completing those calculations,the relational expression between the dosage of bentonite and plastic viscosity,yield point and filter loss was determined.The next step involved calculations to determine the quality of the bentonite.Those calculations involved comparing the projected performance parameters with those of reference bentonite and and then drawing the characteristic rhombus to calculate the quality value of bentonite.Quality values of five bentonite samples were calculated and sorted in order;the quality of five bentonite samples was then matched with the performance of the corresponding drilling fluid.Consquently,this indicates that the optimizing method for drilling fluid with bentonite is reliable by the characteristic diamond diagram.

     

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