油藏钻完井最佳实践:巴西陆上钻井BHT方案中应用钻井液、螯合剂/破酶剂系统和增产设计的产能评估

A. B. Leal, A. L. Barroso, Xandel Miranda, L. Flores, Gutembergue Medeiros, C. Marcelino, Lillian Moranezi, Rogério Amadeu Pereira, F. S. Oliveira, Herick Bulhões Cândido
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引用次数: 3

摘要

大量水平井最终被证明是工程故障,对产能结果产生了负面影响。本文将讨论一种适用于巴西东北部Sergipe盆地高BHT(井底温度)枯竭水平井的非破坏性钻井液方法。特别地,对定制的螯合剂/酶滤饼破碎系统的应用和乳化液的潜在形成进行了评估。然后对滤失剂和增粘剂添加剂的性能进行了高BHT评价。最后,对使用防乳剂的必要性进行了评价,因为试验表明RDF滤失液与储层油之间形成了乳状液。最后一步是制定RDF Breaker。这些井筒生产液被设计用于攻击特定的RDF泥饼成分;一种酶和一种螯合剂,分别具有消耗淀粉和碳酸钙成分的功能,最大限度地减少对储层的损害。结果表明,温度稳定剂在240°F以上的高温下与聚合物表现出良好的相互作用。选择羟丙基淀粉作为滤失剂,是因为在243°F条件下,羟丙基淀粉的API滤料体积较小。在相同条件下,两种黄原胶的增粘效果较好。所选择的防乳剂对API过滤器和原油的防乳效果良好。通过反渗透试验验证了破胶剂的有效性,表明它是由RDF形成的泥饼清除剂。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Reservoir Drilling and Completion Best Practices: Well Productivity Assessment Applying Drill in Fluid, Chelant/Enzyme Breaker System and Stimulation Design on Onshore Well BHT Scenario in Brazil
A significant number of horizontal wells have ultimately proven to be engineering failure impacting the productivity result negatively. This paper will discuss an approach of a suitable non-damaging fluid designed to drill a depleted and high BHT (Bottom Hole Temperature) horizontal well located on the Sergipe Basin, Northeastern Brazil. Particularly, the application of a customized Chelant /Enzyme filter cake Breaker System and potential Formation of emulsion was evaluated presenting results here. The performance of the fluid loss and viscosifier additives was then evaluated for high BHT. Finally, the necessity of the use of emulsion preventer was evaluated, since tests showed emulsion formation between RDF fluid loss and reservoir oil. The last step was to formulate RDF Breaker. These wellbore productive fluids are designed to attack specific RDF mudcake components; an enzyme and a chelant with the functionality to consume the starch and calcium carbonate components, respectively, minimizing reservoir damage. The results show that the temperature stabilizer displays favorable interactions with polymers when exposed to high temperatures, above 240 °F. The hydroxypropyl starch was selected as the fluid loss controller because it presented lower API filter volume under conditions of 243 ° F for 48h. Under the same conditions between the xanthan gum analyzed for the viscosifying additive, one showed better rheological results. An emulsion preventer selected displayed good results in the action against formation of emulsion of the API filter and the oil. Breaker effectiveness was proven with the Return Permeability Test performed, which showed acted as a mudcake remover formed by the RDF.
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