水合物开采中化学因素对井壁稳定性的影响  

Chemical Factors Affecting Wellbore Stability in Hydrate Extraction

作　　者：甘卉 张莹 祝小虎 龚伟 丁霄 罗鑫 高月 GAN Hui;ZHANG Ying;ZHU Xiaohu;GONG Wei;DING Xiao;LUO Xin;GAO Yue(PetroChina Qinghai Oilfield No.1 Gas Production Plant,Haixi Qinghai 816000,China;PetroChina Qinghai Oilfield No.1 Oil Production Plant,Mangya Qinghai 816400,China;Qinghai Oilfield Engineering Construction Supervision Co.,Ltd.,Dunhuang Gansu 736202,China;PetroChina Qinghai Oilfield No.2 Oil Production Plant,Mangya Qinghai 817500,China;Xi'an Shiyou University,Xi'an Shaanxi 710065,China)

机构地区：[1]中国石油青海油田采气一厂,青海海西816000 [2]中国石油青海油田采油一厂,青海茫崖816400 [3]青海油田工程建设监理有限责任公司,甘肃敦煌736202 [4]中国石油青海油田采油二厂,青海茫崖817500 [5]西安石油大学,陕西西安710065

出　　处：《当代化工》2024年第10期2281-2286,共6页Contemporary Chemical Industry

基　　金：国家自然科学基金青年科学基金项目(项目编号:21705122)。

摘　　要：随着全球对清洁能源需求的增加,天然气水合物作为一种潜在的能源资源受到广泛关注。通过实验分析和模拟,探讨了化学添加剂对天然气水合物固态流化开采中井壁稳定性的影响。通过在实验室模拟井环境中设置不同的温度(0~15℃)和压力(5~20 MPa)条件,系统地评估了化学添加剂(甲醇和乙二醇)对水合物形成速率及其机械稳定性的影响。结果表明:化学添加剂能显著改变水合物的形成和解离速率,在5℃和10 MPa的条件下,添加抑制剂后水合物的形成率从79.4%降至63.2%,解离时间从2.3 h延长至3.8 h。此外,抑制剂的使用对水合物的抗压强度和弹性特性也产生了影响,在0℃和20 MPa的条件下,未添加抑制剂的水合物抗压强度为21.6 MPa,而添加抑制剂后抗压强度提高至23.4 MPa。同样,储能模量从未添加抑制剂时的1200 MPa增加至1350 MPa,从而提高了材料的整体稳定性。As the global demand for clean energy increases,natural gas hydrates have received widespread attention as a potential energy resource.In this paper,the impact of chemical additives on wellbore stability in solid fluidized production of natural gas hydrate was explored through experimental analysis and simulation.The effects of chemical additives(methanol and ethylene glycol)on hydrate formation rates and mechanical stability were systematically evaluated by setting different temperature(0~15℃)and pressure(5~20 MPa)conditions in a laboratory simulated well environment.Research results showed that chemical additives could significantly change the formation and dissociation rates of hydrates.Under the conditions of 5℃and 10 MPa,the hydrate formation rate dropped from 79.4%to 63.2%after adding inhibitors,and the dissociation time extended from 2.3 h to 3.8 h.In addition,the use of inhibitors also had an impact on the compressive strength and elastic properties of hydrates.Under the conditions of 0℃and 20 MPa,the compressive strength of hydrates without inhibitors was 21.6 MPa,while after adding inhibitors,the compressive strength increased to 23.4 MPa.Likewise,the storage modulus increased from 1200 MPa without inhibitor addition to 1350 MPa,thereby improving the overall stability of the material.

关 键 词：天然气 水合物 化学因素 稳定性 固态流化开采 弹性 

分 类 号：TQ028.1[化学工程] TE53[石油与天然气工程—油气田开发工程]