SMW围护墙防渗控制技术

针对超深基坑(挖深超过15m的基坑)由于受地压、土性、设备性能、施工控制技术等影响而导致围护结构防渗控制相对较难的情况,以南京地铁1号线珠江路车站工程为背景,基于对超深基坑SMW围护结构渗水原因的分析,从理论上对防渗墙的厚度及墙体的变形进行设计计算,并从施工的角度对防渗控制技术进行了探讨.     

赵53井泡沫水泥浆固井技术

因地层压力复杂、邻近断层,赵53井固井施工时存在易发生油气水窜和水泥浆漏失的问题,而且封固段较长.为此,研制开发了密度低、强度大且防窜性能好的新型泡沫水泥浆体系,并对其性能进行了试验研究.该井应用泡沫水泥浆固井施工顺利,固井质量合格.     

Zeolite formation in alkali-activated cementitious systems

Autoclaved aerated concrete (AAC) is a unique building material. Because of its cellular nature, it is lightweight, self-insulating, sound- and fireproof, as well as insect and mold resistant. Furthermore, AAC is free of VOCs and various fibers associated with wood and glass wool construction. In an attempt to toughen AAC and make it less prone to on-site damage, a conventional fly-ash-based AAC formulation is being supplemented with sodium hydroxide (NaOH). The introduction of sufficient alkali promotes the growth of crystalline zeolites in the tobermorite matrix during autoclave curing. It is postulated that in situ grown zeolites will serve the same purpose as added fibers. Inasmuch as fly-ash-based AAC reactions often do not go to completion, a phase study of the development of tobermorite and zeolites from a gel-like slurry made from reagent grade chemicals was undertaken. Mixtures were studied as a function of time and temperature. Phase development depends on bulk composition and curing conditions. Longer curing at higher temperatures causes the Na-P1 that forms initially to change to analcime. Whereas Na-P1 is bladelike in habit and is seen to intermingle with the slightly larger blades of tobermorite, the Na-P1 gradually undergoes a phase change to analcime that forms very large cubes. This change has the potential to disrupt the AAC matrix.     

A simple semiempiric model for NMR relaxometry data of hydrating cement pastes

In this contribution, results from NMR relaxometry experiments on hydrating white cement pastes are presented. Nonexponential effects are discussed and quantified by stretched-exponential analysis. From the magnetization decay curves in transverse relaxation experiments, the degree of hydration is estimated and a semiempiric model is proposed describing the relationship between the microstructure development in the hydrating cement and the degree of hydration.     

The identity of the sulfur‐containing phases present in cement clinker manufactured using a high sulfur petroleum coke fuel

Cement clinker produced using a high sulfur petroleum coke fuel has been analysed to determine the identity of the sulfate‐containing phases. Quantitative X‐ray diffraction methods were used in conjunction with extraction procedures to concentrate or extract the sulfate phases. The minerals of interest were anhydrite (CaSO₄), aphthitalite (3K₂SO₄·Na₂SO₄), arcanite (K₂SO₄), calcium langbeinite (K₂SO₄·2CaSO₄) and thenardite (Na₂SO₄). Overall sulfur content of the clinker increased in proportion with the amount of sulfur in the fuel. The clinker produced using the high sulfur fuel was found to contain a significantly increased concentration of aphthitalite but a reduced amount of thenardite. Comparison of the experimental results with theoretical predictions based on the Bogue formulae shows differences in respect of calcium langbeinite, which is not detected in the clinker, and thenardite, which is detected. Copyright © 2004 Society of Chemical Industry     

水泥胶结测井存在的问题和建议

分析了目前国内外主要用于水泥胶结测井的仪器的基本原理、影响因素、优点和不足、适用范围以及仪器和资料解释方面存在的主要问题.对水泥胶结测井技术的发展、测井系列的重新确定、资料解释技术和处理软件的研究、成果评价标准的建立、新的测井仪器的研制等方面提出一些建议.     

辽河测井公司固井质量评价技术

固井质量对油气水井的正常生产及其寿命影响巨大.随着油田勘探开发的深入,各种超深井、水平井、厚套管井、超低密度水泥等工艺的应用,给固井质量评价技术提出了新的要求.着重介绍辽河测井公司固井质量评价仪器的现状、刻度标定方法及处理与评价方法,并给出了具体应用实例及我们的认识.     

聚丙烯酸酯弹性乳液聚合研究

本介绍在丙烯酸酯乳液共聚反应中，在乳化剂总用量一定的条件下，改变阴离子型和非离子型乳化剂的配比以及改变非离子型乳化剂的种类，制得一系列Tg=-10℃的弹性乳液和Tg=27℃乳液。用这两种乳液做与水泥配伍实验，并用这两种乳液与一定浓度的钙离子溶液相混合，检测乳液与它们相互混合的稳定性。     

水泥环对套管射孔后抗挤毁强度的影响

建立了未射孔套管、不带水泥环射孔套管、外裹水泥环套管的有限元分析模型,对这3种情况下套管的抗挤毁强度进行了对比分析。得出如下重要结论(1)射孔使套管抗挤毁强度显著降低,降低幅度为29%;(2)固结良好的水泥环对于加强射孔套管强度有明显作用,使射孔套管的抗挤毁强度提高188%;(3)水泥环不能抵消射孔对套管抗挤毁强度的伤害,外裹固结良好水泥环的套管,射孔后其抗挤毁强度与无孔套管相比下降156%。     

哈德油田水平井固井工艺技术

哈德油田油层具有埋藏深(5100 m左右)、油层薄的特点.针对该油田地质构造复杂、井深、井身结构简单、裸眼长达5000 m左右、井斜、方位变化大,垮塌掉块、井漏严重、水平位移大、井底温度高、井下复杂、地层压力系数变化大等情况,为保护套管,提高油井寿命,油层套管为全封双级固井,一级固井为典型的大斜度水平井作业;二级固井为长裸眼、小间隙固井作业.对固井水泥浆进行了优选,确定一级固井水泥浆采用由嘉华G级水泥 硅粉(100∶36)和LANDY806L系列水泥外加剂组成的水泥浆,二级固井水泥浆采用嘉华G级水泥、漂珠、微硅为基本成分,加入LANDY806L系列水泥外加剂,密度为1.35～1.46 g/cm3 的低密度水泥浆.配合使用引导浆和隔离液以及其他固井技术措施,该套固井水泥浆在哈德油田得到了很好的应用,固井质量为优质.