石灰固化钻井泥浆-水泥混合物在固井中的应用

Advances in Geo-Energy Research, 2019, 3(2): 141-148

原文网址: http://www.astp-agr.com/index.php/Index/Index/detail?id=107

        目前大多数的石油和天然气井都采用合成基泥浆进行钻探。在钻井过程中一般会产生两种废弃物：废泥浆和岩屑。废弃物的处理可以使用多种方法，但经过处理后的废弃物会被弃置在环境中。尽管看似对环境无害，但长期积累依然会对环境造成破坏。不过在大部分废钻井泥浆中也存在一些使用水泥浆液配方的添加剂使其稳定下来，以便在油气井固井作业中重复使用的情况。近年来，在进一步处理废弃的合成基钻井泥浆之前，用石灰将其固化。这些石灰固化后的泥浆可用作水泥窑的原料、建筑材料的原料和湿地修复材料。

       最近，加纳矿业大学石油工程系Richard Amorin博士研究了不同浓度的石灰固化钻井泥浆与水泥的混合物在油气井固井作业中的作用。水泥与浓度为0%⁓100%的石灰固化钻井泥浆共混，浓度梯度设置为10%，并对其效果进行评价。结果表明，随着石灰固化合成基泥浆浓度的增加，泥浆的密度、自由流体、流变性和抗压强度等性质逐渐降低。而且，浓度在10%和20%的石灰固化泥浆与水泥混合使用时的效果更好，具有良好的潜力，在小型固井工程中具有良好的应用潜力，有助于降低废物管理的成本。

Evaluation of blended lime-stabilised spent synthetic-based drilling mud and cement for oil well cementing operations

Richard Amorin, Prince Opoku Appau, Edward Osei

(Published: 2019-01-11)

CorrespondingAuthor and Email: Prince Opoku Appau, appau.opoku@gmail.com, 2017290109@student.cup.edu.cn; ORCID: https://orcid.org/0000-0003-0521-6620

Citation: Amorin, R., Opoku Appau, P., Osei, E. Evaluation of blended lime-stabilised spent synthetic-based drilling mud and cement for oil well cementing operations. Advances in Geo-Energy Research, 2019, 3(2): 141-148, doi: 10.26804/ager.2019.02.03.

ArticleType: Original article

Abstract：

      Most current oil and gas wells are drilledwith synthetic-based muds. During drilling, two types of wastes: spent muds anddrilled cuttings, are generally generated. Several methods are used in thetreatment of these wastes. However, after treatment of these wastes, they aredisposed into the environment. Although they seem to be environmentallyfriendly, greater accumulation may degrade the environment. Nonetheless, someadditives used in cement slurry formulation are also present in most of thespent drilling muds, therefore they could be stabilised for reuse in oil andgas wells cementing operations. In recent times, lime is used to stabilisespent synthetic-based drilling mud before disposal or for further treatment.These lime-stabilised muds find use as feedstock of cement kiln, raw materialfor the production of construction material and wetland restoration materials.This research studies the performance of blended lime-stabilised drilling mudand cement at varied concentrations for oil and gas wells cementing operations.The cement was blended with lime-stabilised mud with concentrations from 0% to100% at a step of 10% and their properties evaluated. Slurry properties likedensity, free fluid, rheology and compressive strength results obtained showedthat these properties decreased with the increase in percentage blend of thelime-stabilised spent synthetic-based mud. However, it was observed thatconcentrations of 10% and 20% blends of lime-stabilised mud with cementperformed better with good potential to be considered in minor cementing worksby the industry to help reduce the cost of waste management.

Keywords: Compressive strength, cement slurry, free fluid, rheology, lime-stabilised mud.

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