使用无损伤、无腐蚀性的酶解井筒清理液实现零表皮完井

B. Ghosh, Ismail Mohammad Alcheikh, D. Ghosh, S. Osisanya
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引用次数: 2

摘要

本研究的目的是:(1)根据实际储层孔隙度分布选择聚合物基钻井液桥接颗粒的尺寸分布,以尽量减少内部过滤损害;(2)开发一种由特殊设计的生物酶和原位有机酸前体组成的无腐蚀性井筒清理液,在完井前去除外部滤饼,使表皮接近于零。钻井液是基于理想充填理论(IPT)制定和开发的。采用基于IPT的粒度模拟器,利用碳酸盐岩储层的FMI测井信息对方解石粒度进行了模拟。筛选并优化了黄原胶淀粉特异性生物酶,以实现泥饼中聚合物的完全溶解。酸性前驱体的配制和发展,以溶解方解石颗粒,同时保持腐蚀水平低于最大可接受的限制。进行了酸性前体与生物酶的相容性试验。最后的清理配方在动态条件下进行了腐蚀研究。通过岩心驱油实验,在油藏条件下对整个开发过程进行了验证。通过对陶瓷盘和碳酸盐岩心桥塞进行岩心驱替测试,成功测试了该配方流体。聚合物基钻井液形成了渗透性极低的滤饼(<0.1 md),显著防止了内部滤液的破坏。在碳酸盐岩心塞上沉积了极低渗透率的滤饼,从而减少了破坏性侵入。研究了几种酯水解反应动力学,最终选择了一种组合作为合适的酸前驱体,因为它们能够在井下条件下水解3小时内产生所需浓度的酸。最佳酸前驱体能在3小时后生成所需酸的3%,并能在12小时内保持低酸浓度。腐蚀速率明显低于工业限制,因此没有必要使用酸性缓蚀剂。泥浆损坏的碳酸盐岩心桥塞经清理液处理后,恢复渗透率高达96%。研制了一种新型钻井液,用酶-酸前体复合物彻底清除了其滤饼沉积。通常情况下,井筒清理液是高酸性的,需要缓蚀剂。新配方在不使用缓蚀剂的情况下,有效地减少了井下工具的腐蚀。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Towards a Zero-Skin Well Completion with Non-Damaging Non-Corrosive Enzymatic Wellbore Cleanup Fluids
The objectives of this study were; (1) selection of size distribution of bridging particles of polymer-based drill-in fluid based on the actual reservoir porosity distribution in order to minimize the internal filtration damage, and (2) to develop a non-corrosive wellbore cleanup fluid comprising of a specially designed bio-enzyme and in-situ organic acid precursors to remove the external filter cakes and bring the skin close to zero prior to well completion. Drill-in-fluids were formulated and developed based on Ideal Packing Theory (IPT). The calcite particle size simulation was conducted using a particle size simulator based on IPT using FMI log information from a carbonate reservoir. Xanthan-starch specific bio-enzymes were screened and optimized to achieve complete dissolution of the polymers present in the mud-cakes. Acid precursors were formulated and developed to dissolve the calcite particles and at the same time keeping the corrosion level below the maximum acceptable limit. Compatibility tests between the acid precursors and the bio-enzymes were performed. The final cleanup formulation was subjected to corrosion studies at dynamic conditions. The entire development was verified at reservoir conditions through core flooding experiments. The formulated fluid was tested successfully against ceramic disks and carbonate core plugs by performing core-flood tests. The polymer based drill-in-fluid resulted in a very low permeability filter cake (<0.1 md), preventing internal filtrate damage significantly. Deposition of a very low permeability filter cake was achieved on carbonate core plugs which results in reduced damaging invasion. Several ester hydrolysis reaction kinetics were studied and finally one combination was chosen as the suitable acid precursor, because of their ability to generate required concentration of acid within three hours of hydrolysis at downhole condition. The best acid precursor satisfied the requirements by generating 3% of acid needed after 3 hours and maintained low acid concentrations for 12 hrs. The corrosion rates were found to be significantly below the industry limits and use of acid corrosion inhibitor is not necessary. Return-permeability of mud damaged carbonate core plugs was as high as 96% after exposing to clean-up solution. A new drill-in fluid has been developed and its filter-cake deposition was completely cleaned up with enzyme-acid precursor combination. Normally wellbore cleanup fluids are highly acidic and need corrosion inhibitor. The new formulation was effective in minimizing corrosion of downhole tools without the use of corrosion inhibitors.
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