摘要
闵桥火山岩油藏以缝、洞、孔为主要储集空间和油气运移通道,复杂的裂缝网络系统中孔、洞、缝相互连通,水沿裂缝突进、快速导致油井水淹,采出程度为5.8%,综合含水已达89.9%。讨论并计算了挤注堵剂时堵剂进入裂缝所需的启动压力和最大爬坡压力。考察了木钙、PAM-乌-间、水玻璃-氯化钙、钠土-HPAM、复合颗粒等5种常用堵剂的性能,认为单独使用时都不能满足该油藏堵水要求。讨论了堵水工艺,确定采用笼统挤注方式,全程控制挤注流量以保持注入压力恒定,堵剂用量合理化。报道了闵桥22断块唯一的生产井闵22井三次化学堵水实施情况及结果。该井油层温度66.7℃,生产井段包括钻井液漏失段。2003年7月注入黏土-HPAM堵剂液60 m3,未建立爬坡压力,增油减水效果差,有效期90天。2004年1月采用水玻璃-氯化钙堵剂堵漏,木钙堵剂封口,增油减水有效期达180天,以后发生边底水绕道突进。2005年12月采用油溶性好的复合颗粒堵剂堵水,增油减水有效期长达210天。三次堵水投入产出比1∶3.8。表5参11。
In lava oil reservoir of Minqiao, Jiangsu, the fractures and fissures, caves and pores serve as main reservoir spaces and passagesof reservoir fluids as well, and, being connected each with other, makes up a complex fractured network. Owing to water plunging through the fractures and fissures, the production wells would fast flooded out and a composite water cut of 89.9% was observed while an oil recovery was 5.8% only. The minimum pressure needed for a water shutoff agent （WSOA） to squeeze into fractures and fissures and the maximum pressure raise in the course of squeezing WSOA are discussed and determined. 5 commonly used WSOAs, namely Ca-lignosulfonate （CaLS）, PAM/urotropine/resorcin, water glass （WG）/CaCl2, Na-bentonite/HPAM, and combinational particulated resins （CPRs） were evaluated for performance properties and no single WSOA could meet the requirements for water control in the reservoir. As for technologic aspects, following measures were taken： WSOA injection without zonal isolation; precise control of pumping rate in whole injection course to keep injecting pressure steady; and rationalized WSOA volume injected. The operations and results of 3 chemical shutoff in the only production well, MQ22, at Minqiao block 22 reservoir were presented. The producing layers of the well was of 66.7℃ and included a section of lost drilling fluid circulation. July 2003, 60 m3 of clay-HPAM suspension was squeezed but no raise in injection pressure was observed, only a weak positive response appeared in oil productivity enhancement （OPE） and in water cut reduction （WCR） in 90 days. Jan 2004, WG/CaCl2 were applied for sealing the leaking zones and CaLS-as postpad for sealing the rear ends of WSOA; in result OPE and WCR were maintained in 180 days and after then the plunge of edge and bottom water roundabout occured. Dec 2005, a water control job was conducted with 2 particulated oil soluble resins in combination and led to OPE and WCR over 210 days. An imput to output ratio 1 ： 3.8 was obtained owing to the 3 water control jobs totally.
出处
《油田化学》
CAS
CSCD
北大核心
2007年第1期38-41,82,共5页
Oilfield Chemistry
关键词
化学堵水
重复封堵
堵水工艺
堵水剂复合
火山岩油藏
裂缝性油藏
闵桥22井
江苏闵桥油田
chemical water shutoff
repeated blocking/sealing
water shutoff technology
water shutoff agents in combination
lava oil reservoir
fractured oil reservoir
Minqiao oil field
