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| 1 | Simulating the Effect of Hydrate Dissociation on Wellhead Stability During Oil and Gas Development in Deepwater显示文摘It is well known that methane hydrate has been identified as an alternative resource due to its massive reserves and clean property. However, hydrate dissociation during oil and gas development(OGD) process in deep water can affect the stability of subsea equipment and formation. Currently, there is a serious lack of studies over quantitative assessment on the effects of hydrate dissociation on wellhead stability. In order to solve this problem, ABAQUS finite element software was used to develop a model and to evaluate the behavior of wellhead caused by hydrate dissociation. The factors that affect the wellhead stability include dissociation range, depth of hydrate formation and mechanical properties of dissociated hydrate region. Based on these, series of simulations were carried out to determine the wellhead displacement. The results revealed that, continuous dissociation of hydrate in homogeneous and isotropic formations can causes the non-linear increment in vertical displacement of wellhead. The displacement of wellhead showed good agreement with the settlement of overlying formations under the same conditions. In addition, the shallower and thicker hydrate formation can aggravate the influence of hydrate dissociation on the wellhead stability. Further, it was observed that with the declining elastic modulus and Poisson's ratio, the wellhead displacement increases. Hence, these findings not only confirm the effect of hydrate dissociation on the wellhead stability, but also lend support to the actions, such as cooling the drilling fluid, which can reduce the hydrate dissociation range and further make deepwater operations safer and more efficient. | LI Qingchao CHENG Yuanfang ZHANG Huaiwen YAN Chuanliang LIU Yuwen | 2018 | Journal of Ocean University of China2018，17，1： | 11 |
| 2 | 强交变热载荷下页岩气井水泥环完整性测试显示文摘页岩气井大规模水力压裂过程中,因井筒内的温度、压力波动及持续变化、循环加卸载引发的水泥环完整性问题将威胁到井筒的完整性。为了弄清强交变热载荷下水泥环完整性失效机理、避免页岩气水平井大规模压裂过程中水泥环屏障失效,基于自主研发的实验装置对全尺寸实物“生产套管—水泥环—技术套管”组合体在强交变热载荷作用下的密封完整性和力学完整性进行了测试及评价,获得了2种全尺寸水泥环(普通水泥环和高强度水泥环)在3种强交变热载荷作用下(出现间断CO2气泡的循环次数分别为4次和14次,出现连续气泡的循环次数分别为5次和15次,交变热载荷分别为30~120℃和30~150℃)的完整性实验结果。研究结果表明:①交变热载荷对水泥环完整性具有显著的负面影响,并且随着交变温度及温差的增大,表征水泥环密封完整性的热循环次数急剧减少;②表征水泥环与套管间的剪切力、轴向与径向结合强度等界面力学性能指标均随交变温度增加而下降;③水泥环微环隙主要是由套管与水泥环材料之间的不协调变形所致,而交变热载荷诱导的水泥石自身力学性能衰退及损伤在一定程度上加剧了水泥环密封完整性失效。结论认为,该研究成果可以为深部页岩气水平井大规模压裂施工设计提供参考。 | 林元华 邓宽海 易浩 曾德智 唐亮 韦奇 | 2020 | 天然气工业2020，40，5： | 10 |
| 3 | Nonlinear dynamic analysis and fatigue damage assessment for a deepwater test string subjected to random loads显示文摘The deepwater test string is an important but vulnerable component in offshore petroleum exploration,and its durability significantly affects the success of deepwater test operations.Considering the influence of random waves and the interaction between the test string and the riser,a time-domain nonlinear dynamic model of a deepwater test string is developed.The stress-time history of the test string is obtained to study vibration mechanisms and fatigue development in the test string.Several recommendations for reducing damage are proposed.The results indicate that the amplitude of dynamic response when the string is subjected to random loads gradually decreases along the test string,and that the von Mises stress is higher in the string sections near the top of the test string and the flex joints.In addition,the fatigue damage fluctuates with the water depth,and the maximum damage occurs in string sections adjacent to the lower flex joint and in the splash zone.Several measures are proposed to improve the operational safety of deepwater test strings:applying greater top tension,operating in a favorable marine environment,managing the order of the test string joints,and performing nondestructive testing of components at vulnerable positions. | Kang Liu Guo-Ming Chen Yuan-Jiang Chang Ben-Rui Zhu Xiu-Quan Liu Bin-Bin Han | 2016 | Petroleum Science2016，13，1： | 3 |
| 4 | 海上气田井口装置抬升高度预测技术研究及应用显示文摘海上生产气井高效开发时,高温高压会带来井口抬升、环空带压等现象,直接影响气井安全生产及开发,甚至带来巨大经济损失。针对目前井口装置抬升预测研究较少以及不足之处,通过建立新型多因素井口抬升预测方法,突破了其他方法考虑因素单一的瓶颈,大大提高了预测精度,并分析了产量、生产时间、各环空压力、固井情况等影响因素对井口装置抬升量的影响及井口抬升高度;通过正交实验分析,得出了主要影响因素的强弱顺序,并将模型应用于DF1-1-×井进行了验证,模型计算高度与现场实测高度十分接近,并预测该井生产期间最大井口抬升高度约为6.8 cm。该方法可对未来高温高压及深水开发气田井口抬升高度进行预测及进行环空泄压建议,对钻完井设计、工程施工及油气田安全生产管理具有重要的指导意义。 | 余意 任冠龙 董钊 张崇 刘贤玉 | 2020 | 新疆石油天然气2020，16，3： | 2 |
| 5 | 井下节流预防井口装置抬升技术研究显示文摘近年来高温高压气藏开发的越来越多,当各层套管存在自由段套管时,高温高压气藏高产井生产时会导致井口装置抬升问题,破坏气井完整性,并可导致地面流程泄漏,直接影响气井安全生产甚至威胁人居环境安全。研究可知,井口装置抬升高度与井口温度呈线性正相关,采取降低产量的方式降低井口温度,可以控制井口装置抬升的高度,但制约了单井产能的发挥。为防止井口装置抬升,通过大量的现场数据建立井口装置抬升预测模型,探索了利用井下节流工艺实现天然气气流在井筒内节流降温防止井口装置抬升技术,为保障气井安全高效生产提供了技术途径。 | 蔡道钢 叶长青 朱达江 杨辉 李玉飞 唐寒冰 | 2021 | 重庆科技学院学报(自然科学版)2021，23，5： | 1 |
| 6 | 井口头锻件用AISI 4140钢高温热压缩变形行为研究显示文摘利用Gleeble-3500热力模拟试验机,在温度850~1 200℃、应变速率为0.1~10 s^(-1),真应变约为0.9的条件下,研究了井口头锻件用AISI 4140钢的热压缩变形行为.采用双曲正弦模型建立了该材料的高温变形本构方程并绘制了热加工图.结果表明:在热压缩过程中,变形温度升高,峰值应力随之减小;而应变速率增大,峰值应力随之增大.在低应变速率0.1~1 s^(-1)且温度高于1 050℃时,表现出动态再结晶行为特征. AISI 4140钢的热变形激活能为427.469 kJ/mol,最佳热加工温度区间为1 050~1 200℃,应变速率在0.1~1 s^(-1). | 刘建宇 张留军 张心金 朱琳 董治中 | 2021 | 天津理工大学学报2021，37，2： | 1 |
| 7 | 海上高温高压井口抬升原因分析与控制措施显示文摘目前随着向高温高压油气井开采,井口抬升现象愈来愈更加普遍,过量的井口抬升会导致诸多问题,增大了井控风险,例如损坏服务管汇和生产管汇,重则使井筒完整性失效,进一步油气泄漏,造成环境污染。为了解决次问题,本文首先分析了井口抬升的原因,以及为了控制井口抬升的频率,提出了井口装置的安装规范化控制和井口抬升无线监测技术措施。结果表明:(1)结合API标准和井口安装指南,在现场创新提出井口安装标准化可追溯管理制度,形成了地面井口关键控制节点推荐做法,对井口抬升实施有效干预预防;(2)研发了全天候全方位井口抬升无线监测装置,并在现场进行试用,实现了井筒屏障的有效管控。该研究成果在国内海上最大规模高温高压气田开发中应用,对气田的安全高效开发提供了重要技术支持,也可为类似“三高”气田开发提供经验借鉴。 | 张涛 杨玉豪 刘贤玉 陈力 | 2022 | 化学工程与装备2022，，7： | 0 |
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