天然气水合物开采井防砂充填层砾石尺寸设计方法  

Gravel sizing method for sand control packing in hydrate production test wells

作　　者：李彦龙[1,2] 胡高伟 刘昌岭[1,2] 吴能友 陈强[1,2] 刘乐乐 李承峰[1,2] 

机构地区：[1]青岛海洋地质研究所国土资源部天然气水合物重点实验室,山东青岛266071 [2]青岛海洋科学与技术国家实验室海洋矿产资源评价与探测技术功能实验室,山东青岛266071

出　　处：《石油勘探与开发》2017年第6期961-966,共6页Petroleum Exploration and Development

基　　金：国家自然科学基金(41606078);国家重点研发计划深海专项(2017YFC0307600);青岛海洋科学与技术国家实验室开放基金(QNLM2016ORP0203;QNLM2016ORP0207)

摘　　要：针对水合物储集层流体抽取法开采过程中面临的出砂问题,提出了针对黏土质粉砂型水合物储集层的"防粗疏细"式防砂充填层砾石尺寸设计方法,并以中国南海神狐海域X站位为例进行了具体分析。以X站位为例,分析了水合物储集层地层砂基本特性,对地层砂粗、细组分进行划分,并分别计算了疏通细组分和阻挡粗组分所需的防砂充填层砾石尺寸范围,通过求解两者的交集来确定最佳砾石尺寸。研究表明,X站位水合物储集层为分选性、均匀性极差且黏土含量较高的粉砂质储集层,上、下部储集层防砂充填层最佳砾石尺寸设计结果分别为143~215μm和240~360μm。在现场施工无法严格满足分层防砂要求的情况下,为了兼顾上、下部储集层,在满足充填强度的前提下,推荐X站位防砂充填层砾石尺寸为215~360μm。To deal with sand production problems during the process of producing natural gas from hydrate-bearing sediments（HBS） using reservoir-fluid extraction method, a new gravel sizing method for sand control packing named ＂Hold coarse while eliminate fine particle（HC EF method）＂ was developed for the clayey hydrate-bearing formations. Site X, in Shenhu area, South China Sea was taken as an example to describe detailed gravel sizing procedure. On the basis of analyzing basic particle size distribution（PSD） characteristics of HBS at Site X, the formation sand was divided into two components, which are coarse component and fine component. The gravel sizes for retaining coarse component and eliminate fine component were calculated, respectively. Finally, intersection of these two gravel sizes was taken as the proper gravel size for Site X. The research results show that the formation at Site X is clayey sand with poor sorting and uniformity, proper gravel size for upper segment packing is 143-215 μm, while that for lower segment packing is 240-360 μm. In consideration of the difficulty of layered sand control operation on offshore platform, proper gravel packing size for Site X is recommended as 215-360 μm.

关 键 词：天然气水合物 试采 出砂管理 防砂充填砾石 中国南海 神狐海域 

分 类 号：TE358.1[石油与天然气工程—油气田开发工程]