一种创新的流变改性剂,具有双重功能:实现油藏钻井的无粘土无损伤系统和深水钻井的平坦流变

V. Gupta, Sakshi Indulkar, Megha Asrani, Arvind D. Patel, S. Ramane, Amruta Sarase, S. Thakur, Ashutosh Kumar Singh
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引用次数: 1

摘要

在钻井油藏中,勘探和生产运营商更倾向于使用非破坏性的非水流体(NAF)。无粘土体系是无损体系的要求之一,其性能应与任何常规NAF一样好。对于深水钻井,NAF必须在很宽的温度范围内具有平坦的流变性。一种创新的流变改性剂,既能提供无粘体系,又能提供平坦的流变曲线,已被开发并成功应用于现场。该流变性改性剂可以减少或完全消除对亲有机粘土的需求,从而提高非破坏性油藏钻井液的质量。本文讨论了新开发的聚酰胺树脂流变改性剂的化学性质,并与目前工业上使用的其他聚酰胺树脂化学性质进行了比较。此外,本文还讨论了合成具有NAF触变特性的交联聚酰胺树脂所需的关键参数。新开发的无粘土体系利用单一流变改性剂组分,提供了提供真正无粘土体系的双重功能,并在广泛的温度范围内提供了平坦的流变特性。在不牺牲乳液稳定性、失滤和流变性等重要泥浆参数的情况下,实现了双重功能。事实上,由于新开发的聚酰胺树脂流变改性剂中加入了表面活性剂的特性,这些泥浆参数得到了提高。无粘土体系可用于泥浆重达18.0 lb/gal、温度高达350°F的深水应用。最近成功的现场试验表明,新系统易于维护,在钻井速度、ECD管理和井眼清洁方面具有良好的流体性能。该产品在1 ppb的低剂量下具有优异的流变特性。即使在这种低剂量下,8½”井眼的LSRV也大于10,屈服点大于15磅/100平方英尺。当系统被严重的盐水污染时,在合成油水比恢复之前,没有出现与流体相关的问题。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
An Innovative Rheology Modifier Which Provides Dual Function : Achieves Non-Damaging Clay Free System for Reservoir Drilling and Flat Rheology for Deep Water Drilling
Exploration and Production operators prefer non-damaging non-aqueous fluid (NAF) for drill-in reservoirs. One of the requirements of non-damaging system is clay free system and it should perform as good as any conventional NAF. For deep water drilling, it is necessary to have flat rheology of NAF over a wide range of temperatures. An innovative rheology modifier which provides clay free system and also offers flat rheology profile has been developed and successfully used in field. The rheology modifier can minimize or totally eliminate the need of organophilic clay to improve the quality of non-damaging reservoir drilling fluid. The paper will discuss the chemistry of newly developed polyamide resin-based rheology modifier and compare it with other poly-amide resin chemistry currently used in industry. Also, the critical parameters which are required to synthesize cross-linked polyamide resin that provide thixotropic properties to NAF will also be discussed The newly developed clay free system utilizes a single rheology modifier component to provide dual functions of providing true clay free system and offers flat rheological profile over wide range of temperatures. The dual function is achieved without sacrificing the vital mud parameters, such as emulsion stability, fluid loss control and rheology. In fact, these mud parameters are enhanced due to surfactant characteristic incorporated in newly developed poly-amide resin-based rheology modifier. The clay free system can be formulated for deep-water applications with mud weights up to 18.0 lb/gal and temperatures up to 350°F. Recent successful field trials as a clay free system for drilling reservoir indicated that the new system is easy to maintain and provides good fluid performance in terms of drilling rate, ECD management, and hole cleaning. This product provides an excellent rheological profile at a low dosage of 1 ppb. Even at this low dosage, LSRV was above 10 in 8 ½" Hole with yield point of greater than 15 lbs/100 ft2. When the system was contaminated with a severe saltwater flow, there were no fluid-related problems before the synthetic oil/water ratio was restored.
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