套管/固井/分区隔离

可膨胀地质聚合物改善区域隔离和堵塞

本文比较了膨胀地质聚合物与膨胀商业水泥在 25° 和 34.5 bar 固化条件下的剪切粘结强度和水硬粘结强度的密封性能。

25℃水浴中的环形测试池。 左：浆料的初始读数； 中间，浆料的固化； 右，浆液的最终读数。
图1-25℃水浴中的环形测试池。左：浆料的初始读数；中间，浆料的固化；右，浆液的最终读数。

在 25°C 和 34.5 bar 的固化条件下，将膨胀地质聚合物 (E-GP) 的密封性能与膨胀商业水泥 (EC) 的剪切粘结强度 (SBS) 和水力粘结强度 (HBS) 进行比较。纯 G 级 (NG) 水泥和纯地质聚合物 (N-GP) 与相应的膨胀版本一起进行了表征。使用环形试验根据线性膨胀来评估这些膨胀剂对水泥和地质聚合物的影响。完整的论文表明，经过优化，地质聚合物可以作为波特兰水泥的替代品。

地聚合物的特性及用途

近年来，地质聚合物作为分区隔离和封堵废弃 (P&A) 作业的可行且环保的替代品而受到关注，因为它具有较高的强度、较低的渗透率以及在高压/高温下的耐久性等强大特性。状况。

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原文链接/jpt
Casing/cementing/zonal isolation

Expandable Geopolymers Improve Zonal Isolation and Plugging

This paper compares the sealability performance of an expanding geopolymer with that of an expansive commercial cement in terms of the shear bond strength and the hydraulic bond strength at curing conditions of 25℃ and 34.5 bar.

Annular ring test cell in a water bath at 25°C. Left: Initial reading of the slurry; middle, curing of the slurry; right, final reading of the slurry.
Fig. 1—Annular ring test cell in a water bath at 25°C. Left: Initial reading of the slurry; middle, curing of the slurry; right, final reading of the slurry.

The sealability performance of an expanding geopolymer (E-GP) is compared with that of an expansive commercial cement (EC) with regard to shear bond strength (SBS) and hydraulic bond strength (HBS) at curing conditions of 25°C and 34.5 bar. A neat Class G (NG) cement and a neat geopolymer (N-GP) were characterized alongside corresponding expansive versions. The effect of these expansive agents on cement and geopolymers was evaluated in terms of linear expansion using the annular ring test. The complete paper reveals that geopolymers can be deployed as an alternative to Portland cement upon optimization.

Geopolymer Characteristics and Use

In recent years, geopolymers have been receiving attention as a viable and environmentally friendly alternative for zonal isolation and plugging and abandonment (P&A) operations because of their robust features such as higher strength, lower permeability, and durability in high-pressure/high-temperature conditions.

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