钻井/完井液

低 ECD 反相乳化液表现出卓越的性能

本文介绍了在高温和压差高达 4,500 psi 的气藏中成功使用新型低当量循环密度无粘土反相乳化液的情况。

酸处理液在处理前（左）和处理后（右）对 95 lbm/ft3 OCIEF 1 滤饼的影响。
图1'酸处理液对95-lbm/ft<sup>3</sup> OCIEF 1滤饼处理前（左）和处理后（右）的提升效果。
资料来源：SPE 211539。

完整的论文描述了在高温和压差高达 4,500 psi 的气藏中成功使用新型低当量循环密度 (ECD) 不含有机粘土的反相乳化液 (OCIEF)。本文的目的是在研究中强调 OCIEF 相对于重晶石基传统反相乳液钻井液和甲酸盐基水基钻井液的优越性能。该液体克服了此类环境中的挑战，且不影响性能。

介绍

新型低 ECD OCIEF 使用四氧化二锰作为加重剂，旨在提高成熟油田的钻井性能。由于酸溶性微粉化四氧化锰的存在，其无破坏性将有助于通过裸眼设计完成该井。

在 OCIEF 中，亲有机粘土和亲有机褐煤分别被聚合物增粘剂和聚合物过滤控制剂替代。

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Drilling/completion fluids

Low-ECD Inverted Emulsion Fluid Shows Superior Performance

This paper describes the success of using a new low-equivalent-circulating-density organophilic clay-free inverted emulsion fluid in gas reservoirs at elevated temperatures and with differential pressures up to 4,500 psi.

Effect of acid-treatment fluid on the 95-lbm/ft3 OCIEF 1 filter cake before treatment (left) and after treatment (right).
Fig. 1—Effect of acid-treatment fluid on the 95-lbm/ft<sup>3</sup> OCIEF 1 filter cake before treatment (left) and after treatment (right).
Source: SPE 211539.

The complete paper describes the success of using a new low-equivalent-circulating-density (ECD) organophilic clay-free inverted emulsion fluid (OCIEF) in gas reservoirs at elevated temperatures and with differential pressures up to 4,500 psi. The objective of the paper is to highlight the superior performance of OCIEF over barite-based conventional invert-emulsion drilling fluids and formate-based, water-based drilling fluids in the study. The fluid overcame challenges in such an environment without compromising performance.

Introduction

The new low-ECD OCIEF, using manganese tetroxide as the weighting agent, was developed with an aim to offer improved drilling performance in maturing fields. Its nondamaging nature, the result of the presence of the acid-soluble and micronized manganese tetroxide, would help to complete the well with an openhole design.

In an OCIEF, the organophilic clay and organophilic lignite are replaced by a polymeric viscosifier and a polymeric filtration-control agent, respectively.

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