摘要
目的研究天然气水合物开采过程中,钻井液对喷射破碎压控滑套冲蚀磨损的影响规律及主要影响因素。方法基于欧拉-拉格朗日算法的DPM模型,建立了滑套冲蚀磨损数值分析模型,预测了压控滑套在使用过程中易发生冲蚀磨损的区域。探究了不同的钻井液粒径、入口液相流速、质量流量及封堵块位置的变化,对冲蚀磨损过程的影响规律。结果压控滑套的易冲蚀区域为封堵块面、过流通道口、内壁面三个位置。在控制单因素变量条件下,易冲蚀区域最大冲蚀率和冲蚀面积随着粒径增大而增大,粒径从0.1 mm增大到1.1 mm时,易冲蚀区域平均最大冲蚀率增大了63.4倍,并在不同粒径段呈现不同变化趋势。随着封堵块与滑套距离减小,易冲蚀区域平均最大冲蚀率增加,距离从50 mm降低到5 mm时,平均最大冲蚀率增大了3.8倍,并在不同的距离段呈现不同变化趋势;同时随着封堵块与滑套距离减小,内壁面的冲蚀面积降低明显,封堵块和过流通道冲蚀面积没有显著变化。随着入口流速和流体质量流量的增加,易冲蚀区域最大冲蚀率呈现指数增加,流速从6 m/s增大到14 m/s时,易冲蚀区域平均最大冲蚀率增大了9.5倍,流体质量流量从0.001 kg/s增大到0.007 kg/s时,易冲蚀区域平均最大冲蚀率增大了5.6倍,但冲蚀面积都没有显著变化。结论滑套封堵块面、过流通道和内壁面最易发生冲蚀破坏。冲蚀颗粒直径应该小于0.3 mm为宜,封堵块与滑套距离应该大于30 mm,同时入口流速和质量浓度越小,冲蚀情况越好。综合最大冲蚀率数值及增长倍数分析,粒径是冲蚀率增长的主要因素。该研究为喷射破碎压控滑套的设计和应用提供了指导意义。
In order to study the influence law and main influencing factors of drilling fluid on the erosion and wear of injection&crushing pressure-controlled sliding sleeve during the exploitation of natural gas hydrate,based on the DPM model of Euler-Lagrange algorithm,this paper establishes a numerical analysis model of sliding sleeve erosion and wear to predict the areas where erosion and wear were likely to occur during the use of the pressure-controlled sliding sleeve,and explores the influence of different drilling fluid particle size,inlet liquid velocity,mass flow rate and sealing block position on the erosion and wear process.The erodible area of the pressure-controlled sliding sleeve was three locations:the sealing block surface,the cross flow crossing,and the inner surface.Under the condition of controlling single factor variable,the maximum erosion rate and erosion area of the erosion area increase with the increase of particle size.When the particle size increased from 0.1 mm to 1.1 mm,the average maximum erosion rate of the erodible area increased by 63.4 times,and showed different trends in different particle size sections.As the distance between the sealing block and the sliding sleeve decreased,the average maximum erosion rate of the erodible area increased.When the distance decreased from 50 mm to 5 mm,the average maximum erosion increased by 3.8 times and showed different trends at different distances.At the same time,as the distance between the sealing block and the sliding sleeve decreased,the erosion area of the inner surface decreased significantly,while that of the sealing block and the cross flow crossing was no significant change.With the increase of the inlet flow velocity and the fluid mass flow rate,the maximum erosion rate of the erodible area exhibited an exponential increase.When the flow velocity increased from 6 m/s to 14 m/s,the average maximum erosion rate of the erodible area increased by 9.5 times.When the fluid mass flow rate increased from 0.001 kg/s to 0.007 kg/s,the average maximum erosion rate of the erodible area increased by 5.6 times,but the erosion area did not change significantly.Therefore,the sealing block surface,cross flow crossing and inner surface of sliding sleeve are most prone to erosion damage.The diameter of the erosion particles should be less than 0.3 mm.The distance between the sealing block and the sliding sleeve should be greater than 30 mm.At the same time,the smaller the inlet liquid velocity and mass flow rate,the better the erosion.Based on the analysis of the maximum erosion rate and the multiple of growth,the particle size is the main factor for the increase of the erosion rate,which provides guidance significance for the design and application of the injection&crushing pressure-controlled sliding sleeve.
作者
唐洋
何胤
姚佳鑫
孙鹏
TANG Yang;HE Yin;YAO Jia-xin;SUN Peng(Southwest Petroleum University,Chengdu 610500,China)
出处
《表面技术》
EI
CAS
CSCD
北大核心
2021年第2期254-260,270,共8页
Surface Technology
基金
国家自然科学青年基金(52004235)
中国博士后科学基金资助项目(2020M683359)
四川省科技应用基础研究项目(2020YJ0152)
南方海洋科学与工程广东省实验室(湛江)基金(ZJW-2019-03)
国家重点研发计划(2018YFC0310200)
西南石油大学油气藏地质与开发国家重点实验室开放基金(PLN201827)
博士后创新人才支持计划项目(BX20190292)
四川省科技创新(苗子工程)培育及小发明小创造项目(2020037)。
关键词
天然气水合物
压控滑套
固态流化开采
冲蚀磨损
冲蚀率
数值模拟
natural gas hydrate
pressure-controlled sliding sleeve
solid fluidization mining
erosion wear
erosion rate
numerical simulation
