为了适应油田多级精细注水的需要,研制了楔入式钢骨架胶筒封隔器。该封隔器胶筒内部采用钢骨架结构,外部挂胶,坐封时利用锥形刚体插头楔入钢骨架胶筒中,撑开胶筒贴在套管壁上进行密封。解封时油套环空高压液体推动插头和外筒接头,使插头退出胶筒,也可在作业时上提管柱逐级解封。该封隔器具有注水坐封、反洗井解封、大排量洗井、重复坐解封等特点。该封隔器现场应用4口井,应用效果好,是一种现场操作可靠,且能够满足多级精细注水需求的井下封堵工具。

In order to meet the needs of the accurate subdivision water injection in oilfield,the wed-ging packers with steel skeleton rubber was developed.This packer rubber is steel skeleton rubber inside and hanging rubber outside.Packer setting when using tapered plug rigid body wedge into the steel skeleton rubber tube,does hold rubber tube sealing on the casing wall,packer releasing when tubing-casing annulus hyperbaric liquid pushing the plug and outer tube joint,make the plug out of rubber tube,can also be released gradually by lifting up the string.This packer is character-ized by being set by water injection,being released by washing,being washed by large displace-ment and being repeatedly set and released.The wedging packers with steel skeleton rubber were tested in 4 wells with 100% success.It indicates that this packer is a downhole isolation tool with reliable in-situ operating performance and satisfies the need of accurate subdivision water inj ection in oilfield.

常规的 Y445型丢手悬挂封隔器应用于海上油田大尺寸井筒时，存在中途坐封、丢手单一和强制解封等问题。研制了 Y445-210型丢手悬挂封隔器。该封隔器设计有防中途坐封结构，采用液压和机械双重丢手方式，可独立打捞、解封，具有坐封容易、密封可靠和打捞方便等优点。室内试验和现场应用表明：该封隔器施工可靠性高，各项性能满足现场使用要求，可应用于海上油田244．5 mm（95/8英寸）井筒内油水井的防砂、卡封、堵水和压裂等作业工艺。

Absttact:Conventional Y445 hook wall packer has some problems such as midway setting,single release and forced unset when used in large-scale wellbores of offshore oil well.A new type of Y445-210 hook wall packer has been designed.It can resolve the problems above,which has anti-midway set structure,hydraulic and mechanical release methods and independent unset structure and is safe to be fished.Laboratory experiment and field application show that the packer has high operation reliability,meets the requirements of field use and can be used for sand prevention, packer setting,water plugging,fracturing and other operation process of offshore oilfield large-scale wellbores(9in).

AHR封隔器坐封在油气井的大斜度段或水平段时,采取常规的过提方法解封封隔器困难,处理不当可能造成大修事故。在分析AHR封隔器结构和工作原理基础上,进行水平井管柱轴向受力分析,模拟计算施加在井口的过提力能够传递到封隔器上的轴向拉力;在油管的额定抗拉负荷内,如果轴向拉力达不到封隔器的预定解封力,用连续油管正循环注入氮气,掏空油管内的部分液体,释放地层压力对封隔器的上顶力,同时上提油管柱,可以剪断销钉实现封隔器解封。国外Y油田S22井的井口上提力达到油管的额定抗拉强度921kN时,下传到封隔器的轴向拉力仅为236kN;掏空1 650m的油套管液柱,释放地层压力的上顶力为205kN,作用在封隔器销钉的合力可达到预定剪断值441kN,成功实现了封隔器解封。现场应用表明,掏空油管内部分液体释放地层压力的上顶力,可以补偿上提管柱解封封隔器时管柱抗拉强度的不足,为大斜度井、水平井中解封封隔器提供了新的方法。

AHR packer retrieval by normal overpull can be difficult when they have been set in highly deviated or horizontal sections ,or when improper operations have caused workover problem .The axial force of tubing in horizontal well was analyzed based on structure and mechanism analysis of the AHR packer , and the over pull force that transmitted to the packer was simulated .Within the rated tensile strength of tubing if the overpull was not sufficient to overcome the preset releasing force of the packer ,coil tubing could be utilized to evacuate the tubing by pumping nitrogen through positive circulation ,and release for‐mation pressure to push the packer upwards ,at the same time ,tubing could be pulled for shearing off the pins and releasing the packer .Taking Well S22 in Y field as an example ,when the pulling force reached a tensile strength of 921 kN ,the force transmitted to the packer was only 236 kN ,then 1 650 m was tubing was e‐vacuated and 205 kN upwards force was rel

油轮坞修海管停运期间,采用海水进行封存,海水对海管会造成腐蚀,影响海管解封后的使用。通过模拟海管的工作环境,采用失重法对海水封存期间选用的缓蚀剂进行筛选,确定最佳缓蚀剂及最佳加注浓度。结果表明,封存介质为海水时,HYH-28缓蚀剂效果最好,从缓蚀性和经济性考虑,HYH-28的最佳加注浓度为40mg·L-1。

During the docking repair, sea-pipelines connected to the FPSO (floating production storage and offloading)will offstream and use seawater to seal up for safekeeping.Seawater will make sea-pipeline corrosion and affect the normal use after unlocking.By stimulating the environment of sea-pipeline,using polarization resistance method and weight-loss method,the kind of inhibitor to be used was screened.the suitable inhibitor and the best concentration of filling during the offstream were studied.The results show that the effect of inhibitor HYH-28 is the best when storage medium was sea water.From the corrosion resistance and economy,the best concentration of filling of the HYH-28 was 40 mg·L-1 .

贝克SAB-4封隔器是储气库完井中常用的永久式封隔器,其卡封性能可靠,得以广泛应用。但该封隔器回收过程相对复杂,不能像常规封隔器一样解封回收,尤其在储气库高压注采条件下,施工风险较大。通过对SAB-4封隔器结构和工作原理进行分析,制定了磨铣、套铣、打捞相结合的回收方案,成功完成了2口井的SAB-4封隔器及下部联座射孔管柱的回收施工,为储气库井更换注采管柱以及确保储气库井安全提供了一套行之有效的修井方法。

Baker SAB -4 packer is a common kind of permanent packer used in gas storage wells completion.It is widely used because of its outstanding sealing performance.But its withdrawal is complicated because it can’t be taken back by deblocking like other usual packers.The construction risks are especially high under high injection -production pressures of gas storage.By analyzing structure and working principles of SAB -4 packer,a withdrawal project involving milling,washover and fishing was proposed to complete the withdrawal of packer and perforation pipes.Withdrawal con-structions for two wells were successfully implemented.A set of effective well workover method was provided for changing injection -production pipes in gas storage wells and guaranteeing safety.