Methods for Evaluating the Performance of Drilling Fluids Plugging Fractures in Hard and Brittle Shales
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摘要: 调研了钻井液封堵性评价方法,并针对硬脆性泥页岩的特点,筛选出4种方法进行对比实验。研究发现:高温高压滤失量能表征钻井液泥饼渗透性;高温高压砂床、渗透性封堵(PPT)等评价方法,能评价钻井液对泥页岩微米级固定裂缝或孔喉的封堵效果,但不能够准确地评价纳米级封堵剂的封堵效果,也不能反映钻井液与泥页岩相互作用过程中,岩石裂缝或孔喉发生变化情况下封堵剂的封堵效果;而压力传递实验能够评价各种类型封堵剂对硬脆性泥页岩裂缝或孔喉的封堵效果,还能反映不同类型的封堵剂在钻井液与泥页岩相互作用过程中,发生裂缝或孔喉尺寸变化情况下的封堵效果。
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关键词:
- 硬脆性泥页岩 /
- 封堵性评价 /
- 压力传递 /
- 渗透性封堵仪(PPT) /
- 钻井液
Abstract: Methods for evaluating the performance of drilling fluids plugging fractures in hard and brittle formations have been surveyed and four methods were chosen for comparison based on the characteristics of hard and brittle shales. It was found that the HTHP filter loss can be used to characterize the osmotic property of mud cakes. The HTHP sand bed and permeability plugging tester (PPT) methods can be used to evaluate the capability of drilling fluids to plug the fixed fractures or pore throats with sizes in nanometer ranges, but they are not suitable for evaluating the performance of nanometer plugging agents, nor can they be used to evaluate the performance of plugging agents to plug fractures or pore throats that have changed during the interaction between drilling fluid and shales. The pressure transmission experiment, on the other hand, canbe used to evaluate the performance of all kinds of plugging agents to plug the fractures or pore throats in hard and brittle rocks, it is also used to test the performance of these plugging agents in plugging fractures or pore throats with sizes changed by the reaction of drilling fluid with shales. -
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