常用外掺料对G级油井水泥体积稳定性及力学性能的影响*

针对G级油井水泥浆体体积收缩问题,对比研究了两种常用外掺料(矿渣和石英粉)对水泥浆体体积稳定性及力学性能的影响,并利用等温量热仪(ICC)、X射线衍射仪(XRD)、压汞仪(MIP)和扫描电镜(SEM)分别测试了两种外掺料对水泥水化放热速率,水泥水化产物、孔结构及水泥石微观形貌的影响。结果表明:80℃下水泥净浆体积收缩主要发生在水化早期,对应水泥石早期抗压强度、抗折强度增长迅速;掺入30%比表面积为340m2/kg的矿渣部分改善浆体体积收缩,150d线收缩率较净浆减小32%,早期抗压强度、抗折强度减小,后期强度增大并超过净浆;掺入30%比表面积为710m2/kg的石英粉加剧了浆体体积收缩,150d线收缩率较净浆增大40%,早期抗压强度、抗折强度远低于净浆及掺30%矿渣水泥。长期水养后部分超细SiO2参与反应,加之细颗粒的填充作用使其150d力学强度超过净浆及掺30%矿渣水泥,即水泥石力学强度不仅与外掺料活性有关,还与其粒径分布和养护龄期密切相关。     

PE 井口高压滤芯的研究与开发

本文介绍了一种新型的能在较高压力环境下进行细过滤的ＰＥ井口高压滤芯的结构特征、关键技术研究、技术特性，以及应用效果。     

“一追双控管理”降低欠注井新增速度简述

文章主要介绍了降低欠注井新增速度,"一追双控管理"模式的提出、实施及成效,用事实证明了欠注井治理"防要大于治"的重要性。通过实施"一追、双控"管理模式,临盘采油厂欠注井新增速度达到了近四年以来最低新增水平,欠注井总数也大幅下降,达到了近5年以来最低水平。     

涠洲XX油田清防蜡工艺研究与应用

针对涠洲XX油田AX井的结蜡情况,为了快速有效的解决该井的结蜡问题,对防污染热洗清蜡技术及化学防蜡技术进行了研究并成功应用。采取热洗清蜡及化学防蜡相结合的方式有效的解决了AX井的结蜡问题,采取化学防蜡前产油量平均20m3/d,热洗清蜡后采取化学防蜡措施,产油量一直维持在42m3/d,目前已稳产4个多月,避免了结蜡对油井产量的影响,使采油效率提高到化学防蜡前的2倍多。     

旋挖钻头在填埋场打井工程中的结构改造探讨

文章论述了旋挖钻机钻头的选配和工作原理,针对其在生活垃圾填埋场垃圾层施工中的不足之处,对其结构进行相应的改造,实际使用效果表明:经改造后的旋挖钻头施工时可大大减少作业时间,从而降低打井成孔成本,且改造方便,成本低廉。     

考虑水平井井筒摩阻效应的数值模拟研究

水平井井筒流动与直井有着明显区别。水平井水平段的流动为变质量流动。需要考虑井筒摩阻效应对水平井产能的影响。本文主要应用E clipse软件中的多段井模拟技术,研究在考虑井筒摩阻情况下,水平井井筒的流动规律。在靠近水平井井筒趾端的位置,压力变化较小,越靠近跟端,压力变化越大。从开发指标看:随着趾端注入量的增加,无水采出程度增加,达到1.2~1.3倍时最大,而后又开始下降。     

气井产水积液排失的现场方法研究

采用常规排水采气方法不仅在产出水的举升、处理和注入过程中需要耗费很多能量,而且增添设备所附加的资金投入也增加了采气成本,缩短了气井的经济可采寿命,同时产出水还对环境造成潜在的威胁.因此,研究气井积液机理,以便利用气井自身能量无积液连续生产.     

深井探测用电力通信智能电缆的设计

介绍深井探测用电力通信智能电缆的适用范围、技术性能,阐述该电缆的结构设计、技术参数设计的要点,并比较该电缆与传统深井探测电缆的优缺点。     

Working mechanism of a high temperature (200°C) synthetic cement retarder and its interaction with an AMPS®‐based fluid loss polymer in oil well cement

A copolymer comprising of 2‐acrylamido‐2‐methyl propane sulfonic acid (AMPS®) and itaconic acid (molar ratio 1 : 0.32) was synthesized by aqueous free radical polymerization and probed as high temperature retarder for oil well cement. Characteristic properties of the copolymer including molar masses (M_w and M_n), polydispersity index and anionic charge amount were determined. The copolymer possesses a M_w of ～ 2 × 10⁵ g/mol and is highly anionic. HT/HP consistometer tests confirmed effectiveness of the retarder at temperatures up to 200°C. The working mechanism of NaAMPS®‐co‐itaconic acid was found to rely exclusively on its huge calcium binding capacity (5 g calcium/g copolymer). It reduces the amount of freely dissolved, nonbound calcium ions present in cement pore solution and thus hinders the growth of cement hydrates because of lack of calcium. The value for the calcium binding capability is 46 times higher than the stoichiometric amount per ? COO^? functionality. Consequently, calcium also coordinates to other donor atoms present in the retarder. NaAMPS®‐co‐itaconic acid also adsorbs onto cement, as was evidenced by TOC analysis of cement filtrates, zeta potential measurement and decreased rheology of cement pastes. However, adsorption plays no role in the retarding mechanism of this copolymer. Combination of NaAMPS®‐co‐itaconic acid retarder with a common CaAMPS®‐co‐NNDMA fluid loss additive (FLA) revealed that competitive adsorption on cement between these two admixtures occurs. The retarder fills interstitial adsorption sites on cement located between those occupied by the larger FLA molecules. In consequence, fewer amounts of CaAMPS®‐co‐NNDMA can adsorb and its effectiveness is reduced. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011     

甘谷驿西部油田注水效果分析

通过对超前注水、同步注水、滞后注水进行了对比分析,肯定了超前注水的效果.甘谷驿油田西部注水试验已4年多了,4年多来反九点法注采井网,由于井距小、微裂缝发育、主裂缝明显,东西向油井在部分水淹或含水较高,而南北向油井压裂引效措施后产量不理想,稳产期相对较短,因此优化裂缝主向、侧向井距组合,适当调整注采井网,是提高甘谷驿油田西部注水试验井区效果的关键.