Higher fluid loss volumes and suspension capability are the critical shortcomings of water-based muds. It can promote problems during drilling operations. The rheological and filtration properties of all drilling muds have been continually considered the essential characteristics for a successful drilling operation. Various irreversible problems are directly associated with drilling fluids rheological and filtration properties such as differential sticking, formation damage, borehole instability and uncontrollable formation fluids intrusion to the wellbore. Drilling fluid is closely associated with the complications or solutions of the mentioned problems. The control of such properties is of paramount importance, especially at high temperature conditions of the wellbore. This study aims to formulate a low-solid drilling fluid for better performance by replacing bentonite in conventional fluids with an equal amount of xanthan gum and tapioca starch. The effects of tapioca starch on rheological and filtration characteristics of water-based muds (WBMs) in static conditions have been investigated at different temperatures and pressures. Various mud blends were prepared containing tapioca starch (TS) and polyanionic cellulose (PAC) in the presence of xanthan gum (XG) at different replacement levels. The impact of tapioca starch on rheological and filtration characteristics were evaluated using rheometer, filterpress (LPLT and HPHT) and scanning electron microscope (SEM). The presence of tapioca starch significantly improved rheological and filtration characteristics of water-based muds (WBMs) and revealed that the low solid blends unveiled an obvious shear thinning behavior. Shear stress (σ) versus shear rate (s⁻¹) data of optimized mud samples was best fitted to the Power Law model with R² of 0.99. The flow behavior index was decreased from 0.47 to 0.21, while the consistency index was increased from 0.31 to 4.45 with the addition of tapioca starch. Rheological properties were improved with the starch concentration and were found within the American Petroleum Institute (API) recommended range. Filtrate volume for the samples containing tapioca starch in 14 ppb was found 4 ml at a temperature of 212 °F. Filtercake thickness was measured 0.27 mm with the maximum concentration of tapioca starch. SEM images confirmed the tapioca starch showed a slick and compact filtercakes at the temperature of 212 °F. This research helps to encourage the use of biodegradable and renewable additives in drilling fluids for the exploitation and production of hydrocarbons.

较高的滤失量和悬浮能力是水基泥浆的关键缺点。它会在钻井作业过程中引发问题。所有钻井泥浆的流变和过滤性能一直被认为是成功进行钻井作业的基本特征。各种不可逆的问题与钻井液的流变和过滤特性直接相关，例如差异粘连，地层损坏，井眼不稳定和不可控制的地层流体侵入井眼。钻井液与上述问题的复杂性或解决方案密切相关。尤其在井眼的高温条件下，控制这些特性至关重要。这项研究旨在通过用等量的黄原胶和木薯淀粉代替常规流体中的膨润土来配制低固含量钻井液，以获得更好的性能。在不同温度和压力下，研究了木薯淀粉对静态条件下水基泥浆（WBMs）流变和过滤特性的影响。在黄原胶（XG）存在下，以不同的替代量制备了各种含有木薯淀粉（TS）和聚阴离子纤维素（PAC）的泥浆共混物。使用流变仪，压滤机（LPLT和HPHT）和扫描电子显微镜（SEM）评估了木薯淀粉对流变学和过滤特性的影响。木薯淀粉的存在显着改善了水基泥浆（WBMs）的流变学和过滤特性，并显示出低固含量的共混物显示出明显的剪切稀化行为。剪切应力（σ）与剪切速率（s^-1）最佳泥浆样品的数据最适合R ²的幂律模型 的0.99。添加木薯淀粉后，流动行为指数从0.47降低至0.21，而稠度指数从0.31升高至4.45。流变性质随淀粉浓度的提高而改善，并且发现在美国石油协会（API）推荐的范围内。在212°F的温度下，发现4毫升的木薯淀粉含量为14 ppb的样品的滤液体积。用木薯淀粉的最大浓度测量滤饼厚度为0.27mm。SEM图像证实木薯淀粉在212°F的温度下显示出光滑而致密的滤饼。这项研究有助于鼓励在钻井液中使用可生物降解和可再生的添加剂来开采和生产碳氢化合物。