雄安新区深部地热储层水力喷射酸化压裂技术

地热作为清洁低碳的可再生能源,对促进实现“双碳”目标具有重要意义.我国深部碳酸盐岩地热资源丰富,但是由于岩体基质渗透率极低,亟需采取高效的储层改造技术建立导流通道才能有效开发.水力喷射酸化压裂工艺是一种集喷砂射孔、水力封隔、酸液刻蚀、多段多簇为一体的增产改造技术,可实现定点沟通地质甜点、一趟管柱体积造缝,对碳酸盐岩热储层具有良好的适用性.首次开展了雄安新区容城地热田水力喷射酸化压裂碳酸盐岩深部地热储层现场试验,通过优化喷嘴结构、优选耐腐蚀管柱材料、针对性设计泵注程序、模拟裂缝扩展形态,研发了能够满足深部碳酸盐岩热储的水力喷射酸压工具和配套工艺,采用“交替泵注交联段塞-胶凝酸”的方式,进一步促进酸液刻蚀远端裂缝,充分沟通天然缝洞,促进水力裂缝与天然裂缝沟通、相交、融汇,从而达到扩大造缝总体积、提高裂缝导流能力的储层高效改造目的.本次现场酸压试验入井总液量为492.65 m^(3),其中压裂液为396.76 m^(3),胶凝酸为95.89 m^(3).试验结果表明:酸压后较酸压前单位涌水量从0.024 m^(3)/(h·m)提高到0.288 m^(3)/(h·m),增产12倍,井口水温增加了10℃,增产效果明显;水力喷射酸压工具耐高温、耐高压、耐磨损、耐腐蚀,节约成本,降低作业风险.研究成果可为深部地热储层增产改造提供技术借鉴与思路.

水平井连续油管拖动转向酸化技术在艾哈代布油田的应用

艾哈代布油田主要采用长井段水平井线性井网开发,由于水平井段长、地层非均质性强,均匀布酸难度很大,为此,提出长井段水平井连续油管拖动酸化工艺及其辅助均匀布酸方法。结合储层特征,确定采用连续油管水平井段变速回抽酸化或定点酸化实现酸液的锥形注入形态,并使用转向酸液体系协助分段均匀布酸、水力喷射突破污染带等辅助布酸方法。现场应用结果表明,酸化后单井产量是酸化前的1.4倍,累计增产原油88.9×104 t,为油田建产提供了工程技术保障。

深层裂缝型碳酸盐岩油藏水平井水力喷射酸压技术

深层裂缝型碳酸盐岩油藏具有埋藏深、温度高、油气藏类型复杂、非均质性强等特点。对于水平井,常规笼统压裂增产改造的效果并不理想,很多产层段得不到动用,施工效果差,使得深层裂缝型油藏的水平井储层改造很难发挥技术优势。文中在分析裂缝型油藏储层岩性特征的基础上,对喷射工具、酸液配方及工艺进行了优化,形成了一套深层裂缝型油藏水平井水力喷射酸压改造技术。该技术在现场应用了十余井次,验证了其可靠性。

Calcium Carbonate Lab Scale Continuous Carbon Dioxide-jet Controlled Production Following Fuzzy Logic Model

In this paper, lab scale production carried out of calcium carbonate in 400 mL open cylindrical beaker reactor following fuzzy logic approach is reported. 10 grams of Calcium hydroxide is mixed in 250 mL deionized water. Continuous jet supply of carbon dioxide is maintained at controlled flow rate. Reaction histories are noted for different reaction temperatures. Continuous constant magnetic stirring is applied to maintain homogeneity. The data obtained is fuzzified by constructing universe of discourse of temperature, reaction time, and amounts of reactants with reaction conversion. Rule based model is tabulated and results show that fuzzy logic approach is promising to set on data to plan and scale up the process. It is also found that a jump can not be made at this time with few studies of fuzzy logic applications to physiochemical processes unless otherwise amassing and storing up plentiful deduced explorations.