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在压力系数低、易漏地层,特别是裂缝型、溶洞型碳酸盐岩地层固井中,采用1.88g/cm^2左右的常规密度的水泥浆固井,极易引起井漏,造成固井失败,或者固井质量不合格。应用低密度水泥浆固井,可防止因为压破松软地层而导致的井漏,并能提高水泥浆顶替率,从而提高单级注水泥固井的成功率,减少或避免补注水泥作业。根据紧密堆积理论,采用水泥、漂珠、超细矿粉、膨胀剂不同粒度的颗粒级有效调配,研制出了低密度水泥体系。通过实验筛选出外掺荆在设计要求密度下的干混最佳比例,从而达到了水泥浆低密度高强度的目的。现场应用表明,这种水泥浆体系解决了DWQ109区块易漏地层的固井技术难题,实现了良好的地层封隔。 相似文献
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二连油田阿南老区阿31—102井由于周围生产井开发政策不同,各套目的层压力系数差别较大,高低压储层共存,压力系数为0.8-1.4。钻井过程中在1459—1670m井段累计发生7次漏失,共漏失钻井液150m^3,井漏时钻井液密度1.31g/cm^3。井漏同时也存在较严重的油水浸现象。为解决此问题,在井温低、水泥用量小的情况下,采用低密度防漏堵漏水泥浆体系固井。该水泥浆体系在降低水泥浆密度的同时,在水泥中加入弹性防漏堵漏材料,以达到防止漏失及油水浸的双重目的。现场应用施工顺利,未发生漏失情况,36h后测井,固井质量优质,满足二连油田老区复杂储层的低温防漏固井要求。 相似文献
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水平井全井段封固双凝防漏水泥浆技术 总被引:2,自引:0,他引:2
焦石坝地区是我国第一个非常规页岩气产能示范区。随着勘探开发的不断深入,钻遇水平段漏失井不断增多,且普遍存在承压能力低,压力窗口窄,易发生气窜的现象,严重影响固井质量。为提高易漏页岩气水平井固井质量,研究开发了一套用于水平井全井段封固的双凝防漏堵漏水泥浆,室内对该固井水泥浆体系的性能进行了评价研究。结果表明,该水泥浆不仅具有较高的水泥石强度,同时具有快速的静胶凝强度发展速度和较短的稠化转化时间,表现出较强的防窜效果和良好的堵漏效果,这对于保证固井质量以及后续完井作业具有重要的意义。该水泥浆技术目前已应用于焦石坝水平井固井作业中,成功封固3口水平段漏失严重井,水泥浆全部成功返出地面,候凝48h测井检测结果显示,水平段固井质量为全优质。 相似文献
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巴48-31井是二连油田低压区块上的一口开发井,目的层段压力系数在0.3~0.4之间,钻井过程中在油层段的1225~1227 m及井深1305 m处发生2次漏失,发生井漏时钻井液密度仅为1.13 g/cm3;同时存在着油水外侵.在井温低、水泥用量小的情况下,决定采用防漏堵漏低密度水泥浆体系固井.该水泥浆体系在降低水泥浆密度的同时,通过在水泥浆中加入弹性防漏堵漏材料,以达到防止漏失的目的.现场应用表明,该防漏堵漏低密度水泥浆能够满足二连油田产层压力系数在0.3~0.4之间的低温易漏井固井的要求;施工顺利,未发现漏失情况;24 h后声幅测井,固井质量为优质. 相似文献
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二连油田阿南老区阿31-102井由于周围生产井开发政策不同,各套目的层压力系数差别较大,高低压储层共存,压力系数为0.8~1.4.钻井过程中在1459~1670 m井段累计发生7次漏失,共漏失钻井液150 m3,井漏时钻井液密度1.31g/cm3.井漏同时也存在较严重的油水浸现象.为解决此问题,在井温低、水泥用量小的情况下,采用低密度防漏堵漏水泥浆体系固井.该水泥浆体系在降低水泥浆密度的同时,在水泥中加入弹性防漏堵漏材料,以达到防止漏失及油水浸的双重目的.现场应用施工顺利,未发生漏失情况,36 h后测井,固井质量优质,满足二连油田老区复杂储层的低温防漏固井要求. 相似文献
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高强超低密度水泥浆体系研究 总被引:8,自引:0,他引:8
国内外利用颗粒级配和紧密堆积理论研究开发了1.20~1.65g/cm^3的低密度水泥浆体系,解决了固井中的技术难题,取得了比较满意的效果。随着勘探开发复杂古潜山油藏、海相碳酸岩盐裂缝油藏,保护油层、保护套管的需要,对水泥浆提出了更高的要求。特别是超深井、高温度、长封固、平衡压力固井施工,要求水泥浆超低密度、高强度、体积不收缩。目前,国内外还没有水泥浆密度低于1.10g/cm^3的超低密度体系的应用报道 。通过采用美国3M公司的高强低密度人造空心微珠,进行了超低密度水泥浆体系的试验,在水泥浆密度达到1.04~1.10g/cm^3时,依然具有较高的强度和较好的水泥浆性能,可以应用到超深井、超长封固的固井施工中. 相似文献
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高强度超低密度水泥浆体系实验研究 总被引:4,自引:3,他引:1
国内外利用颗粒级配和紧密堆积理论研究开发了1.20~1.65 kg/L的低密度水泥浆体系,解决了固井中的许多技术难题.但是,对于密度为1.15~1.30 kg/L的超低密度水泥浆体系还缺乏系统的研究.以最紧密堆积和颗粒级配理论为依据,建立了最佳模型,精选出了以G级水泥、微细水泥、空心微珠和玻璃微珠为主体的四级颗粒级配系统,配合适量的激活剂研究出了密度为1.15~1.30 kg/L的超低密度水泥浆体系,并率先在实验室模拟出了超低密度水泥浆返至地面的室温候凝施工过程.解决了低密度水泥浆体系的稳定性和高早期强度等难题,具有良好的性能和现场推广应用价值. 相似文献
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跃进3-3XC井完钻井深达9432 m,水平钻进距离超过3400 m,刷新了亚洲最深和超深水平大位移井的纪录。该井地质结构复杂,施工难度大,对水泥浆性能要求高,除了高温、高压外,地层承压能力低,极易发生漏失。针对此类问题,通过研发新型功能性材料,构建了C-Lo PSD(1.30 g/cm3)、C-Lite STONE(1.60 g/cm3)与C-Hi PSD(1.40 g/cm3)三套低密度水泥浆体系,涵盖了中低温、高温等应用条件,并在跃进3-3XC井中成功应用,水泥浆性能满足固井需求。与之前用水泥浆体系相比,混浆效率、流变性、悬浮稳定性、水泥石抗压强度等明显提升。其中,C-Lite STONE(TBHC=75 ℃/TTOC=30 ℃)与C-Hi PSD(TBHC=145 ℃/TTOC=105 ℃)水泥浆体系在温差分别为45 ℃和40 ℃下,顶部48 h抗压强度达到8.1 MPa和14.3 MPa。跃进3-3XC井在施工期间多次遭遇漏失,通过使用自研的新型堵漏材料C-B62和C-B66,成功封堵裂缝,保证了固井施工的顺利进行。 相似文献
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Abstract Using statistical methods and information from petrophysical logs of eight wellbores, the porosity changes that are considered as important features to evaluate quality of reservoir were studied in the Asmari reservoir layer located in one of the fields of southwest Iran. Logs used to measure the porosity usually involve neutron and sonic logs. Normal distribution test, regression, and variance analysis are among the statistical processing methods suitable to examine changes in porosity with the depth of each wellbore and to compare these changes in the studied wellbores. The results showed that these processes are regarded as the fast and efficient ways for examining porosity in the fields with large area. Considering the results of tests conducted, it was determined that the porosity has not the same changes in the studied wellbores. Furthermore, it was determined that there is no particular trend between porosity and depth. This can be due to the dominant lithology type in the reservoir layer that is mostly the rock carbonate. These rocks are heterogeneous and their porosity are often secondary that was formed due to diagenesis and tectonic processes. 相似文献
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分析了石油化工装置中心控制室的功能特点,阐述了中心控制室抗爆设计的必要性;深入探讨了中心控制室的布置、室内环境要求、建筑门窗及构造的抗爆措施、建筑屋面和外墙保温的做法、结构抗爆计算、结构各参数的变化对抗爆结构的影响;结合工程实例阐述了中心控制室抗爆设计的要点。 相似文献
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Abstract The problem of water production is one of the major technical, environmental, and economical issues associated with oil and gas production. The main goal of this study is to prepare a reservoir numerical simulator with emphasis on water coning. The study mostly involves the numerical simulation of water coning and includes proposed correlations in the literature. The computer program included four distinct modules to calculate: critical or maximum allowable oil rate, water breakthrough time, well performance after water coning take palaces, and water coning simulation. Flow equations of water and oil were discretized and numerically solved for two-dimensional coordinates. The implicit scheme was used to calculate unknown pressures of any grid block. For calculation of water saturation, explicit scheme was used. Real field data of a well in southwest Iran was put into the program and critical rate, water breakthrough time, well performance after water coning, and water coning simulation of reservoir were determined. The authors found that the results of correlations are very far from the reality. On the other hand, numerical simulation shows good agreement with real production data. In addition, it was observed that the present production rate of this well would result in rapid water coning. 相似文献
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超低渗透油藏水平井产能影响因素之间相互关联与干扰,传统的单一因素分析难以定量描述水平井参数对其产能影响的主次顺序和显著程度。针对该问题,引入正交试验设计方法,就压裂裂缝参数及水平井参数对产量的影响进行了直观分析,包括裂缝条数、裂缝半长、裂缝导流能力和水平井长度等影响参数。根据所得到的主次关系结果,优选了适合于超低渗透油藏水平井开发的压裂裂缝参数和水平井长度的最佳组合方案。结果对于超低渗透油藏水平井开发井网布置方案的优化设计具有一定指导意义。 相似文献
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通过对3套石化装置联合控制室建筑设计的分析研究,阐述了当前潮流趋势装置管控一体化-联合控制室的优点及其共同拥有的建筑设计特点,特别强调抗爆结构的联合控制室与常规非抗爆建筑物的建筑设计的主要区别。 相似文献
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以具有典型特低渗透油层特点的西峰油田长6储层为研究对象,分析了储层的物性特征、储层敏感性矿物、地层水性质,进行了室内速敏、水敏、酸敏、碱敏、盐敏等敏感性评价实验,认识了钻井完井液对特低渗透储层的伤害机理和伤害程度,确定了钻井完井液施工参数,并以此为基础研制出一种新型的低固相强抑制低伤害完井液配方。使用低固相强抑制低伤害完井液后用无水煤油驱排,平均静态伤害率为9.6%,均属于轻度伤害。在庄平3井的现场应用表明,该完井液体系适应西峰油田的地质特点,对储层的损害率小于30%。该体系满足了水平井钻井的施工需要,施工作业井下安全,不阻不卡,达到了储层保护要求。 相似文献
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Chemical water control technique has been successfully used to improve oil recovery of mature waterflooding reservoirs. However, for high-temperature and low-permeability sandstone reservoirs, not many options are available. An inorganic gel composed of aluminum chloride hexahydrate as gelling agent and urea as an activator was developed. Based on the proper gelation time and degree of syneresis, the optimum mass ratio of aluminum chloride and urea was 1:0.625. According to the gel strength and economical cost, the reasonable concentration of aluminum chloride should range from 3.0% to 6.0%. Gel compatibility with various formation brines showed that the gel could tolerate sodium chloride concentrations up to 80 g·L ?1 and calcium chloride concentrations up to 40 g·L ?1. Long-term thermal stability and sandpack flow results showed that after aging for 60 days at 110°C, the gel showed approximately 82% permeability reduction when about 16% syneresis was observed in bulk samples. 相似文献