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聚合物压裂液冻胶体系在压裂施工过程中会在裂缝中和裂缝壁留下残渣造成储层伤害,降低聚合物浓度可以减轻这种伤害,但又会遇到冻胶体系黏弹性降低支撑剂沉降的问题,因此,研究优选满足携砂要求的低浓度聚合物压裂液体系具有实际意义.用实验方法研究了低浓度聚合物压裂液的增稠剂、交联剂及破胶剂.并评价了压裂液体系的抗温抗剪切性能、流变性能、携砂性能、破胶性能、低伤害性能、防膨性能和滤失性能.实验结果表明,低浓度聚合物压裂液的浓度为常规聚合物压裂液浓度一半时即可满足压裂时的携砂要求,抗温抗剪切性能优于清洁压裂液和常规聚合物压裂液,并且破胶后的残渣量明显减少,降低了对储层的伤害程度,是一种较为环保的低伤害压裂液. 相似文献
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聚合物压裂液残留物对压裂裂缝支撑带和地层渗透率造成难以恢复的伤害,影响压裂改造效果.为此,研发了一种新型黏弹性表面活性剂--无聚合物压裂液.该压裂液由羧酸衍生物(NRF-01a)组成,在盐水中,它能形成抗变形的棒状或球状胶束,使溶液具有黏弹性.该液体遇水或碳氢化合物自动破胶,无残留物,能满足油层压裂改造的需要.简述了这种无残渣压裂液的形成机理,测试了压裂液的性能.室内试验结果表明,该压裂液黏度随温度上升而上升,在60℃左右上升到最大值,且经过高剪切破坏后,黏度能迅速恢复,有良好的剪切恢复性,以水稀释和与烃接触破胶后,破胶液黏度接近清水黏度,不需要另加破胶剂.破胶液残渣测定结果显示,残渣含量基本为0;对基质和裂缝支撑带的伤害率均低于常规压裂液;防膨性能和对稠油降黏作用均很显著.该压裂液现场应用取得显著效果. 相似文献
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低伤害压裂液在苏里格气田的应用 总被引:1,自引:0,他引:1
苏77区块位于苏里格气田东部,属于典型的低孔、低渗、低压气藏,常规压裂液存在残渣含量高、不易返排、对储层伤害大等不利因素.研制了一种新型低伤害羧甲基瓜胶压裂液,该压裂液稠化剂用量小,比常规瓜胶压裂液的用量减少1/3~1/2;该羧甲基瓜胶水不溶物含量低,比常规瓜胶平均降低90%;压裂液残渣含量低,在105℃下残渣含量小于150 mg/L,仅为常规瓜胶压裂液的30%左右;压裂液弹性优于黏性,携砂性能好,破胶彻底.该压裂液在苏77-17-9H井进行了试验应用,压裂效果显著,其适用于类似苏里格气田的低渗气藏. 相似文献
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水力压裂是大牛地气田低孔低渗储层开发的有效手段,压裂液是压裂工艺技术的重要组成部分,而目前0.45%HPG压裂液残渣含量较高(300~700 mg/L),对储层基质和人工裂缝伤害大。通过室内实验评价,优选有机硼交联剂HB-JLJ、高效助排剂HB-ZPJ以及生物酶破胶剂HB-PJJ,并结合常规黏土稳定剂、杀菌剂和起泡剂等添加剂,形成一套适合90℃储层温度条件的低浓度瓜胶压裂液体系。该压裂液体系具有良好的交联、携砂和流变性能,破胶液残渣含量为173~202 mg/L,表面张力为22.2~22.6 m N/m,较现用0.45%HPG压裂液对岩心伤害率降低19.96%。0.30%HPG压裂液体系在D井现场应用各项性能良好,增产效果显著。 相似文献
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粘弹性清洁压裂液的作用机理和现场应用 总被引:4,自引:1,他引:4
常规水基压裂液破胶后具有较高的残渣量,对支撑裂缝伤害较大,在一定程度上影响了油气田的产量.研究开发出了新型的VES清洁压裂液体系,它是由VES粘弹性表面活性剂和水或盐水组成.该压裂液集粘弹性、抗剪切性、自动破胶性于一体.通过分析VES清洁压裂液的粘弹性形成机理、抗剪切机理、携砂机理、破胶机理、滤失机理、伤害机理,表明粘弹性清洁压裂液具有独特的分子结构和独特的流变性能,它具有配制简便,使用添加剂种类少,不存在残渣,对储层伤害小等特点.现场实验表明,清洁压裂液具有破胶性能,施工摩阻低,携砂能力强,可有效地控制缝高.与使用水基压裂液的邻井相比,粘弹性清洁压裂液压裂施工后增产效果明显. 相似文献
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采油过程中,酸化是油气井增产、注水井增注的主要措施。砂岩基质酸化和碳酸岩基质酸化都是在低于储层破裂压力的条件下向地层中注入酸液,溶解地层中的可溶物质,清除孔隙或裂缝中的堵塞物质,从而使油气井增产或注水井增注的一种工艺措施。本文着重讨论了砂岩酸化的设计计算方法,并由此建立一套基质酸化设计方法。 相似文献
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《Oil and Energy Trends》2008,33(5):6-7
This section summarizes downstream developments of the previous month. Exploration & Production are covered in 'Upstream Review'.
An upsurge of violence in Iraq threatened a recovery in output that began earlier this year. Production in the northern fields hit a post-invasion high of 620,000 bpd in March, rising by 180,000 bpd in one month. Fighting in the south, however, cut production there by more than 100,000 bpd as government troops tried to subdue Shi'ite militias in and around Basrah. Oil installations damaged in the south included a pipeline and a pumping station. The Iraqi government nevertheless announced that oil production would reach 2.9 mn bpd by the year's end, requiring an increase of nearly 500,000 bpd over April 2008 levels. Foreign help is to be sought via a series of technical service agreements and - later this year - an upstream licensing round. Japan's Ministry of Economy, Trade and Industry says it wants a bigger role for Japanese oil companies in both the upstream and downstream sectors in Iraq. Kurdistan says it is negotiating with Baghdad to export oil produced from new oil fields there. The central government does not recognize production agreements drawn up by the Kurdistan Regional Government. The EU - desperate for gas to fill its Nabucco pipeline - has approached Iraq for up to 1 bn cfd. 相似文献
An upsurge of violence in Iraq threatened a recovery in output that began earlier this year. Production in the northern fields hit a post-invasion high of 620,000 bpd in March, rising by 180,000 bpd in one month. Fighting in the south, however, cut production there by more than 100,000 bpd as government troops tried to subdue Shi'ite militias in and around Basrah. Oil installations damaged in the south included a pipeline and a pumping station. The Iraqi government nevertheless announced that oil production would reach 2.9 mn bpd by the year's end, requiring an increase of nearly 500,000 bpd over April 2008 levels. Foreign help is to be sought via a series of technical service agreements and - later this year - an upstream licensing round. Japan's Ministry of Economy, Trade and Industry says it wants a bigger role for Japanese oil companies in both the upstream and downstream sectors in Iraq. Kurdistan says it is negotiating with Baghdad to export oil produced from new oil fields there. The central government does not recognize production agreements drawn up by the Kurdistan Regional Government. The EU - desperate for gas to fill its Nabucco pipeline - has approached Iraq for up to 1 bn cfd. 相似文献
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