For the obstruction and reinforcement of permeable rocks (pores and or fractures), materials to combat loss of circulation (LCMs) are commonly used in the drilling fluid. LCMs, when forming bridges, support and seal rocks, with the objective of preventing drilling fluid from reaching the reservoir. In this study, drilling fluid formulations were developed using full four-level factorial design (DOE), with a central point (4 ^ 2 + 3) in order to evaluate the effect of drilling fluid components on their rheological properties and in the loss of circulation. The tested fluids were prepared using carboxymethylcellulose polymer (CMC), bentonite (BT) as a thickener, and the materials used to combat loss of circulation were used with diatomaceous earth (DE) and hydrogel (HG). The density and pH of all fluids were adjusted to approximately ≈1.14 g/cm⁻³ and 8.5, respectively, being named F(CMC)BT-DE-HG. The filtration experiments were performed in a HTHP (high temperature, high pressure) filtration cell and the fracture was sealed in a physical simulator, called Fracture Flow Simulator (SEF). The rheological data were adjusted using the Herschel Bulkley model. The incorporation of LCMs in the drilling fluid improved the rheological properties. The results indicated that the investigated factors CMC, BT and HG had the main effects in combating the loss of circulation in the fracture and filtration phases. Diatomaceous earth was not significant in filtration and fracture tests. Finally, based on rheological tests, it can be inferred that the interaction of HG*CMC and BT*CMC is highly significant in combating loss of circulation. The fluid with lower DE level showed superior performance, as it sealed the fracture in 1 min of testing and a low volume of filtrate was observed in the test.

为了阻塞和加固渗透性岩石（孔隙和/或裂缝），在钻井液中通常使用抗渗漏材料（LCM）。LCM在形成桥梁时支撑和密封岩石，目的是防止钻井液到达储层。在这项研究中，使用全四级因子设计（DOE）开发了钻井液配方，并采用了一个中心点（4 ^ 2 + 3），以评估钻井液组分对其流变性和流失性能的影响。循环。使用羧甲基纤维素聚合物（CMC），膨润土（BT）作为增稠剂制备了被测流体，用于抵抗循环损失的材料与硅藻土（DE）和水凝胶（HG）一起使用。将所有液体的密度和pH值调整至约≈1.14g / cm⁻³和8.5分别命名为F（CMC）BT-DE-HG。过滤实验是在HTHP（高温，高压）过滤池中进行的，并将裂缝密封在称为断裂流模拟器（SEF）的物理模拟器中。使用Herschel Bulkley模型调整流变数据。在钻井液中掺入LCM改善了流变性。结果表明，所研究的因素CMC，BT和HG在抵抗裂缝和过滤阶段的循环损失方面具有主要作用。硅藻土在过滤和断裂试验中不显着。最后，基于流变学测试，可以推断出HG * CMC和BT * CMC的相互作用在抵抗循环损失方面具有重要意义。DE含量较低的流体表现出优异的性能，