裂缝性致密砂岩气藏出砂原因及对产气量的影响——以塔里木盆地克深气田为例  

Causes of sand production and its influence on the output of fractured tight sandstone gas reservoirs: A case study on the Keshen Gas Field,Tarim Basin

作　　者：孙贺东[1] 常宝华[1] 张静楠[2] 张建业[3] 王小培[3] 陈宝新[3] 刘磊[3] Sun Hedong;Chang Baohua;Zhang Jingnan;Zhang Jianye;Wang Xiaopei;Chen Baoxin;Liu Lei(PetroChina Research Institute of Petroleum Exploration ＆ Development,Langfang,Heibei 065007,China;CNPC Key Laboratory of Oil ＆ Gas Storage and Transportation,PetroChina Pipeline R＆D Center,Langfang,Hebei 065000,China;PetroChina Tarim Oilfeld Company,Kurle,Xinjiang 841000,China)

机构地区：[1]中国石油勘探开发研究院 [2]中国石油管道科技研究中心.中国石油天然气集团公司油气储运重点实验室 [3]中国石油塔里木油田公司

出　　处：《天然气工业》2018年第11期52-58,共7页Natural Gas Industry

基　　金：中国石油天然气股份有限公司重大科技专项"库车坳陷深层-超深层天然气田开发关键技术研究与应用"(编号:2018E-1803)

摘　　要：为了解决塔里木盆地克深气田面临的气井出砂问题,从储层改造方式、裂缝壁面上岩石颗粒脱落条件、产气量及井筒完整性等4个方面分析了该气田气井出砂的原因,并基于井筒内砂粒受力分析,建立气井临界携砂产气量计算公式,进而研究气藏出砂对产气量的影响。在此基础上,针对气井出砂的不同阶段提出了相应的治砂对策。研究结果表明:(1)引起裂缝性致密砂岩气藏出砂的原因包括储层裂缝发育、储层改造规模大、产气量高及井筒完整性差等方面,其中储层裂缝发育和产气量高是主要的出砂原因;(2)对于无游离砂的情况,当气井产气量大于21.2×10~4m^3/d时,近井区域裂缝壁面的砂粒逐渐脱落;(3)对于存在游离砂的情况,当气井产气量大于9.4×10~4m^3/d时,近井区域裂缝壁面砂粒逐渐脱落;(4)井口及井底积砂是影响气井产气量的关键因素,在出砂早期阶段井口积砂是导致产气量降低的主要因素,在出砂中后期阶段井底积砂是导致产气量降低的主要因素;(5)克深气田出砂临界产气量较低,临界携砂产气量相对较高,及时排砂以避免井筒大规模积砂是治理该类气藏出砂的关键。结论认为,该研究成果可以为裂缝性致密砂岩气藏治理出砂问题提供借鉴。The gas wells in the Keshen Gas Field, Tarim Basin, sufer from severe sand production. In view of this, the causes of sand pro-duction were analyzed in this paper from four aspects, i.e., reservoir stimulation, falling condition of rock particle on the wall of fracture, gas production and wellbore integrity. Then, based on the force analysis of the sand in the borehole, the formula for calculating the critical sand carrying production rate was established, and the infuence of sand production on gas production was investigated. Finally, the countermea-sures corresponding to diferent sand production stages of gas well were put forward. And the following research results were obtained. First, the causes of sand production in fractured tight sandstone gas reservoirs are developed reservoir fracture, high gas production rate, large-scale reservoir stimulation and poor wellbore integrity, among which the former two are the main causes. Second, if there is no free sand, the sand on the fracture wall near the well falls gradually when the gas production rate of the gas well is higher than 21.2×104 m3/d. Third, if there is free sand, the sand on the fracture wall near the well falls gradually when the gas production rate of the gas well is higher than 9.4×104 m3/d. Fourth, sand accumulation at wellhead and bottom hole is an important factor afecting the gas production rate of gas wells. In the early stages of sand production, sand accumulation at the wellhead is the main cause of gas production decline. In the middle and late stage of sand production, sand accumulation at the bottom hole is the main factor of gas production decline. Fifth, in the Keshen Gas Field, the critical production rate of sand production is lower and the critical sand carrying production rate is higher, so the key to treat the sand production of fractured tight sandstone gas reservoirs is to discharge sand in time so as to avoid large-scale sand accumulation in the borehole. In conclusion, these research results can be used as a reference for the

关 键 词：裂缝性 致密砂岩气藏 出砂原因 产气量 节点分析 对策 塔里木盆地 克深气田 

分 类 号：TE37[石油与天然气工程—油气田开发工程]