摘要
砾石填充防砂为水合物开采常用技术,防砂精度直接影响开采效果。为此,针对泥质粉细砂储层,展开了颗粒分析实验、电镜扫描实验、防砂实验、渗透实验,对不同目数砾石(30~50、40~60、50~70、60~80、70~90目)的防砂精度展开了试验研究,分析防砂精度对开采效果的影响规律,进而进行优选。结果表明:①随着砾石挡砂精度减小,泥质粉细砂颗粒侵入防砂介质的程度减弱,其中挡砂精度小于70目的砾石不适于该泥质粉细砂储层防砂;②对于淤堵面积占比超过47%的防砂介质,最终稳定状态下不同挡砂精度砾石介质的防砂与产液效果相近;③粒度中值大于433μm砾石介质,其堵塞面积占比会超过47%,此时依靠提高防砂精度来提高产液量的效果会逐渐降低;④50~70目的防砂介质渗透率稳定,稳定产液量相对较高,为最高稳定产液量的87%,而防砂介质损伤较程度与相对较低,为最高损伤程度的50.5%,为该储层条件下最优防砂砾石粒径。
Gravel packing sand control is a common technology in natural gas production,and the number of gravel packing directly affects the production effect.Particle analysis experiment,scanning electron microscope experiment,sand control experiment and permeability experiment were carried out for muddy fine sand reservoir.The sand control accuracy of gravel with different mesh sizes(30~50,40~60,50~70,60~80,70~90 mesh)was studied.The following conclusions are drawn.With the decrease of gravel sand retention accuracy,the degree of silty and argillaceous sand particles invading the sand control medium is weakened.The gravel with a sand retention accuracy less than 70 mesh is not suitable for sand control in the argillaceous silty sand reservoir.For sand control media with blockage area ratio exceeding 47%,sand control and liquid production effects of gravel media with different sand retention accuracy are similar in the final stable state.The gravel medium with a median particle size greater than 433μm or a permeability coefficient greater than 0.056 cm/s will account for more than 47%of the blockage area.At this time,the effect of improving sand control accuracy to improve liquid production will gradually decrease.The increase of sand control precision,the increase of liquid production and sand production in a short time,and the increase of damage degree of sand control medium.Among them,the 50~70 mesh sand control medium has stable permeability and relatively high steady liquid production,which is 87%of the maximum steady liquid production.The sand control medium has relatively low damage degree and relatively low sand production,which is 50.5%of the maximum damage degree,which is the optimal sand control accuracy under the condition of this reservoir.
作者
余莉
李国伟
何计彬
程旷
张钰
YU Li;LI Guo-wei;HE Ji-bin;CHENG Kuang;ZHANG Yu(College of Civil Engineering and Architecture,Hebei University,Baoding 071002,China;Hydrogeological Environment Geological Survey Center,China Geological Survey,Baoding 071530,China)
出处
《科学技术与工程》
北大核心
2021年第35期14994-15001,共8页
Science Technology and Engineering
基金
中国地质调查局水文地质环境地质调查中心项目(DD20190228)
大连理工大学海岸和近海工程国家重点实验室开放基金(LP2016)。
关键词
泥质粉细砂
水合物储层
防砂精度
砾石填充
渗透损伤
argillaceous silty sand
hydrate reservoir
sand control precision
gravel packing
permeability damage
