Safe and Controllable Long-Term Layered Water Injection Technology for the Shengli Offshore Oilfield
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摘要:
为满足胜利海上油田注水井分层注水管柱检修期长、安全、高效的要求，在分析影响分层注水管柱寿命因素的基础上，提出了采用平衡式分层注水管柱改善管柱受力，降低管柱蠕动幅度；采用液压控制方式解决分层和洗井之间的矛盾；研制液控式封隔器解决封隔器提前坐封和满足井控要求的技术思路。通过研制液控压缩式封隔器和液控式环空安全封隔器等关键工具，设计了平衡式分层注水管柱，形成了安全可控长效分层注水技术。液控压缩式封隔器采用液压控制方式始终将其控制在最佳压力状态，洗井时可快速解封，以解决反洗井造成的封隔器寿命不长的问题。液控式环空安全封隔器采用了双液压控制管线，设有安全锁紧机构，洗井和安全通道独立控制，既能满足大排量反洗井要求，又能提高注水管柱长期的安全可靠性。胜利海上油田分层注水井应用安全可控长效分层注水技术101井次，分层注水合格率提高16.6%，注水管柱检修期最长达5年。安全可控长效分层注水技术不仅延长了胜利海上油田分层注水管柱的检修期，满足了安全高效注水的要求，也可以满足水驱开发油田精细分层注水的要求。
Abstract:The Shengli offshore oilfield has a need for long-term, safe and efficient maintenance period for the stratified water injection string in water injection wells.After analyzing the factors affecting the life of the stratified water injection string, this paper proposes a balanced stratified injection string to improve the stress on the string and reduce the peristaltic deformation of the string.To this end, a liquid control method is used to stratify layers to solve the conflicts between layering and well washing.A liquid control packer has been developed to solve the problem of the packer seating in advance and to meet the requirements of well control safety.Through the development of liquid control compression packer and liquid control annulus safety packer key tools, one balanced stratified water injection string was developed, forming a safe and controllable long-term stratified water injection technology.Hydraulic control compression packer adopts hydraulic control method to constantly maintain the optimal pressure state.It can be quickly released during well washing to solve the problem of packer life reduction due to backwashing.Hydraulic control annulus safety packer adapts to a double hydraulic control pipeline, with safety locking mechanism, and thus well washing and safety can be controlled independently.It can not only meet the requirements of large displacement backwashing, but also improve the long-term safety and reliability of water injection string.The balanced stratified water injection string can improve the stress of the pipe string and reduce its creep amplitude.Safe and controllable long-term separated layer water injection technology was used in 101 wells in the Shengli offshore oilfield.The qualified rate of stratified water injection was increased by 16.6%, and the longest maintenance period of water injection string was up to 5 years.Safe and controllable long-term stratified water injection technology not only extends the service life of separated layer water injection string in the Shengli offshore oilfield, but also meets the requirements of safe and efficient water injection.It also meets the requirements of fine stratified water injection in water flooding oilfield.
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图 1 液控式压缩封隔器结构
1.节箍；2.上接头；3.中心管；4.调节环；5.胶筒；6.胶筒隔环；7.一级活塞；8.控制剪钉；9.活塞套；10.二级活塞；11.下接头
Figure 1. Structure diagram of liquid controlled compression packer
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图 2 坐封载荷与胶筒轴向压缩距离的关系曲线
Figure 2. Curve of relation between seat load and axial compression distance
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图 4 液控平衡式测调一体化管柱及受力示意
Figure 4. Liquid control balanced measuring-adjusting integrated string and schematic diagram of stress
表 1 非平衡式和平衡式分层注水管柱不同注入压差下的变形量
Table 1 Deformation of non balanced and balanced stratified water injection string under different injection pressures differences
注入压
差/MPa变形量/m 注水 洗井 非平衡式 平衡式 非平衡式 平衡式 10 0.024 0.003 －0.327 －0.103 20 0.142 0.037 －0.330 －0.105 30 0.942 0.042 －0.332 －0.109 40 1.742 0.042 －0.337 －0.110 
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表 2 非平衡式和平衡式分层注水管柱不同注入压力下的变形量
Table 2 Deformation of non-balanced and balanced stratified water injection string under different injection pressures
注入
压力/MPa变形量/m 注水 洗井 非平衡式 平衡式 非平衡式 平衡式 5 0.015 0.002 －0.287 －0.081 10 0.024 0.003 －0.327 －0.103 15 0.026 0.011 －0.374 －0.176 20 0.029 0.019 －0.397 -0.197
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