GOALI: The Use of Sequestrants for the Dissolution of Scaling Deposits

Grant, Christine s . north Carolina State U“目标：使用封存剂溶解结垢沉积物”本研究的主要目标是阐明在环境友好的螯合聚合物存在下矿物盐溶解的运输和界面机制。在本研究中，选择重晶石作为主要的工作材料，因为重晶石普遍存在于石油加工管道和相关设备的鳞状沉积物中。PI已经确定，在特定的pH值下，溶液中存在多种聚合物。这些个体物种的行为及其对溶解速率的合作影响对于理解溶解过程至关重要。溶解研究将在不同的pH值体系下进行，对应于对溶液中各种主要聚合物配体的研究。该提案的GOALI部分将由英国石油公司上游技术集团油井性能团队的规模管理顾问Ian Collins博士负责。新的BP相互作用有三个方面：(i) BP研究人员将为受控流体动力旋转盘研究提供技术信息和“研究级”和“野外级”重晶石样品；（ii）溶解实验的具体条件将与BP研究人员和实际的现场工程师共同制定，以确保与当前和未来的石油勘探活动相关；（iii）英国石油公司的研究人员将在项目中担任学生研究人员的顾问角色。PI还将继续利用Donlar公司化学家的专业知识，对该过程进行化学反应动力学序列。更广泛的影响：硫酸钡在热聚天冬氨酸存在下的初步批量测试表明，在特定条件下有溶解抑制作用。在拟议的研究中，PI希望在特定的pH、剪切、聚合物浓度/类型条件下，看到重晶石（石油加工规模中常见的一种）的溶解增强。这将对应于聚合物构象/吸附的特定组合，从而产生独特的溶解机制。纯矿物和代表实际工业条件的矿物复合材料的行为应该有所不同。与试图抑制管道和设备上矿物鳞片形成的研究相反，PI的方法侧重于所产生的鳞片的溶解。在这方面，该策略在研究溶解过程中的相互作用化学、界面现象和传递机制（例如传质、流体流动）方面是全面的；它还利用工业相关的配置和化学物质来执行测试。这项研究可能会导致对环境无害的矿物沉积物溶解的替代隔离剂。具体来说，在石油加工管道和相关设备中发现的鳞状沉积物中重晶石的普遍存在是一个重要的问题领域；这是一种绿色化学解决方案，可以使过程的经济效益和环境受益。

Grant, Christine S.North Carolina State U "GOALI: The Use of Sequestrants for the Dissolution of Scaling Deposits"The primary goal of this research is to elucidate the transport and interfacial mechanisms responsible for the dissolution of mineral salts in the presence of environmentally benign chelating polymer(s). In this study, barite is selected as the major working material due to its prevalence in scale deposits found in petroleum processing pipes and associated equipment. The PI has established that at a specific pH, there are multiple polymer species present in solution. The behavior of these individual species and their cooperative influence on the rate of dissolution is crucial to understanding the dissolution process. Dissolution studies will be conducted in different pH regimes corresponding to a study of the various dominating polymer ligand species in solution.The GOALI component of this proposal will occur with Dr. Ian Collins, a Scale Management Consultant in the Well Performance Team of the Upstream Technology Group at British Petroleum in the UK. There are three aspects of the new BP interaction: (i) BP researchers will provide technical information and "research grade" and "field grade" barite samples for controlled hydrodynamic rotating disk studies; (ii) specific conditions for dissolution experiments will be developed in conjunction with BP researchers and actual field engineers to insure relevance to current and future petroleum exploration activities; (iii) the BP research staff will serve in an advisory role to the student researchers on the projects. The PI will also continue to utilize the expertise of the chemists at Donlar Corporation in the chemical reaction kinetics sequences for the process.Broader Impacts:Preliminary batch testing of barium sulfate in the presence of thermal polyaspartates, indicate there is an inhibition of dissolution at specific conditions. In the proposed research, The PI expects to see enhanced dissolution of the barite, a common species in petroleum processing scale at specific conditions of pH, shear, polymer concentration/type. This will correspond to a specific combination of polymer conformation/adsorption resulting in unique dissolution mechanism. There should be variations in the behavior on pure minerals and for mineral composites that represent actual industrial conditions.In contrast to studies that seek to inhibit the formation of mineral scales on piping and equipment, the PI's approach focuses on the dissolution of the resulting scale. In this regard, the strategy is comprehensive in its study of the chemistry of interaction, the interfacial phenomena and the transport mechanisms (e.g., mass transfer, fluid flow) during the dissolution process; it also utilizes industrially relevant configurations and chemistries to perform the testing. This research could result in alternative environmentally benign sequestering agents for the dissolution of mineral deposits. Specifically, the prevalence of barite in scale deposits found in petroleum processing pipes and associated equipment is a significant problem area; a green chemistry solution that could benefit the economics of the process and the environment.