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针对海拉尔油田固井质量不好的现状,除了井队和地质情况的原因以外,也包括了由于井队在下完套管以后,采用泥浆循环的作业,是一部分泥浆挂在套管壁上,由于用清水当冲洗液的时候,对套管壁冲洗效果不好,使在注水泥作业时一部分水泥浆粘在套管壁上,影响固井质量,故采用CHW冲洗液代替清水充当前置液,该冲洗液对套管壁进行了充分的冲洗,大大提高了固井的质量。 相似文献
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随着复杂地层的开发,中低压地层钻井数量增加,对固井需要的低水泥泥浆性能要求越来越高。为了保证油层段的封固质量,首先要在注水泥浆时始终保持并筒内的液柱压力等于或略大于地层流体压力。采用适合本地工区的水泥浆结构,钻井封固应遵循科学性、可行的性。大大减少了水泥浆的失重和窜槽,实现了压稳和防窜的目的,使固井质量得到有效提高。 相似文献
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随着海塔盆地的勘探开发力度不断加大,固井质量问题逐渐显现,应用常规的固井技术已经不能满足勘探开发需求,迫切需要提高固井质量。本文针对海塔盆地的地质特点、施工环境的特殊性,首先从地层、钻井液及水泥浆等方面开展分析,找出了影响海塔盆地固井质量主要因素。通过对水泥浆外加剂及外掺料的实验评价,优选出了适合海塔盆地的矿渣水泥及抗盐降失水剂,并对水泥浆体系与地层储层特征适用性方面进行了实验研究,在此基础上,开发了适合海塔盆地的水泥浆体系及冲洗隔离液体系。经过现场应用,使海拉尔、塔木查格两个油田固井质量合格率平均提高了8个百分点,初步形成了适应海塔盆地特点的固井配套技术。 相似文献
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为了提高固井二界面胶结质量,根据钻井液、前置液以及固井液等紧密联系和相互影响的特点,通过深入解析固井双界面的特性微观结构,研发了一种兼顾钻井、固井两大功能的新型双活化固井工作液体系。优选了活性无机矿物(KA、KB和KC)作为油井水泥外掺料,结合水泥浆体工程性能和水泥石的力学性能对活性外掺料的种类和掺量进行了优选,结合研发的纤维冲洗隔离液,并使用油井水泥晶体膨胀剂,并通过自制固井二界面测试装置对固井材料胶结性能的测试评价,开发了性能优异、二界面胶结力强的新型固井双活化固井工作体系技术,有效地提高了二界面的固井质量,目前已在江苏油田多口井油气层井段进行了成功应用,取得了良好的效果。该体系主要有潜活化胶凝粉材料、界面增强剂、活性激发剂和活性调节剂等组成。在钻井时钻井液中的活化胶凝粉物质呈惰性状态,满足长期循环的钻井要求,形成的特殊泥饼层具有潜在的固化活性。钻开储层前,在钻井液中适当补充活性物质和激活剂,作为固井用的胶凝浆,调节凝结时间,候凝使之固化,完成一次注水泥施工作业,有效地提高了二界面的固井质量。该技术在江苏油田各区块多口井油气层井段进行了应用,与邻井的现场应用效果对比,双活化固井工作液和纤维冲洗隔离液技术可以有效提高二界面固井质量,解决层间窜流问题,满足油田改造和增产措施的需要。 相似文献
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《中国石油和化工标准与质量》2019,(21):43-44
涪陵页岩气田水平段采用油基钻井液钻进,由于地层和套管壁皆呈现亲油性,固井时难以驱替和清洗干净,影响水泥浆顶替效率和胶结质量。通过分析涪陵工区油基钻井液成分组成,经过室内大量模拟实验,优选清油前置液体系,科学的设计前置液清洗浆柱结构,固井质量得到明显提高。 相似文献
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经过前期对准噶尔盆地克拉玛依油田部分区块固井水泥浆体系及配套技术的研究,我们认识到现有的水泥浆体系,特别是泥浆转化为水泥浆技术(MTC)体系的应用,为克拉玛依油田的复杂区块完井固井质量的提高,找到了新途径新技术,尤其是在八区等老油区的完井固井方面的应用,成为提高老油区固井质量的有效技术手段。为此,我们在前期的研究基础上开展了一种新型泥浆转化为水泥浆技术(MTC)的专项实验研究,主要内容是围绕开发新型的激活剂及配套固井液体系展开的,经过室内的反复试验,摸索出一种新型的MTC固井工艺技术,并且取得了初步的现场应用效果。 相似文献
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采用热处理(温度分别为105℃和400℃)手段处理油基钻屑,分别得到两种含油钻屑干渣C1、C2,采用索氏抽提法测定了两种干渣的含油率,并在50℃情况下,分别考察了不同掺量条件下,干渣对固井水泥浆性能的影响。结果表明:C1含油率为4.52%,亲水性差,C2含油率为1.44%,亲水性得到改善;C1作为外掺料添加至水泥浆后,水泥浆的稠化性能、失水、强度等性能受到一定影响,推测是含油量太大导致,影响了水泥浆的凝结及固井常规添加剂效能的发挥,但基本都可控,初步认为C1最大掺量可达20%;C2作为外掺料添加至水泥浆后,对水泥浆性能影响较小,初步认为C2最大掺量可达40%。 相似文献
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Catalytic cracking of petroleum to produce gasoline began in about 1912. The early pioneering work was carried out by Eugene Houdry [1]. Modern fluid catalytic cracking (FCC) was conceived at Exxon and commercially developed in about 1940 [2] using amorphous catalysts. Fluid catalysts are small spherical particles ranging from 40 to 150 um in diameter with acid sites capable of cracking large petroleum molecules to products boiling in the gasoline range. One advantage of the FCC process is the absence of the diffusion limitations present in conventional gas oil cracking due to the small size of the catalyst particle. Since 1964 virtually all catalysts contain faujasite, a stable, large pore, Y-type zeolite dispersed in a silica/alumina matrix [3]. The catalytic aspects of contemporary FCC processes have been reviewed by Venuto and Habib [4], Gates, Katzer, and Schuit [5], Magee and Blazek [6], and Magee [7]. A more recent update of refinery trends has been made available by Blazek [8]. 相似文献
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Catalytic cracking of petroleum to produce gasoline began in about 1912. The early pioneering work was carried out by Eugene Houdry [1]. Modern fluid catalytic cracking (FCC) was conceived at Exxon and commercially developed in about 1940 [2] using amorphous catalysts. Fluid catalysts are small spherical particles ranging from 40 to 150 um in diameter with acid sites capable of cracking large petroleum molecules to products boiling in the gasoline range. One advantage of the FCC process is the absence of the diffusion limitations present in conventional gas oil cracking due to the small size of the catalyst particle. Since 1964 virtually all catalysts contain faujasite, a stable, large pore, Y-type zeolite dispersed in a silica/alumina matrix [3]. The catalytic aspects of contemporary FCC processes have been reviewed by Venuto and Habib [4], Gates, Katzer, and Schuit [5], Magee and Blazek [6], and Magee [7]. A more recent update of refinery trends has been made available by Blazek [8]. 相似文献
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Lina Jassim Umer Rashid Suraya Abdul Rashid Mohamad Amran Salleh Sonny Irawan 《Chemical Engineering Communications》2016,203(4):463-470
A stable ester was synthesized to overcome the ester hydrolysis problem during the drilling of oil or gas wells using a conventional ester-based drilling fluid. The thermal and hydrolytic stability of the produced ester was high owing to the transesterification method employed in this study. The reaction was performed using 2-ethylhexanol and methyl laureate esters in the presence of sodium methoxide as a catalyst. In order to obtain the optimum synthesis conditions, a response surface methodology (RSM) was appraised based on the central composite design (CCD). The optimum conditions were determined as follows: 0.6 wt.% catalyst, 70°C reaction temperature, 1:1.5 molar ratio, and 11.5 min of reaction time. The results of 77 wt.% 2-ethylhexyl ester (2-EH) illustrated a high agreement between the experimental and RSM models. The reaction product contained 77 wt.% 2-EH and 23% 2-ethylhexanol. The kinematic viscosity was 5 mm2/s at 40°C and 1.5 mm2/sec at 100°C; the specific gravity was 0.854, flash point was 170°C, and pour point was ?7°C. The produced product showed similar properties to the available commercial product. However, it was observed that the mud formulation using the synthesized base oil had superior rheological properties at 121°C. 相似文献