海上油田稠油热采井注采一体化工艺技术研究

渤海油田稠油资源丰富,多元热流体吞吐与蒸汽吞吐等热采技术试验效果较好,但需采用注采两趟管柱予以实现,导致热采开发成本较高。鉴于此,通过举升工艺优选、管柱设计、井下关键工具设计、专用井口装置设计及地面配套工艺优选等研究,形成了海上油田稠油热采井注采一体化工艺技术,实现了海上油田稠油注采一体化领域从0到1的突破。现场试验结果表明:该技术所用工具耐温性好,工作筒与机械式安全阀配合良好,打开灵活;工作筒下入顺利,内泵筒插入密封耐压20 MPa,符合技术要求。一体化工艺技术实施的总费用相比目前工艺降低幅度达60%,有助于实现海上稠油油田的规模化热采开发,经济效益与社会效益显著。

Research on Injection-Production Integration Process for Heavy Oil Thermal Recovery Well in Offshore Oilfield

Bohai Oilfield is rich in heavy oil resources,and the thermal recovery technologies such as multi-heat fluid stimulation and steam stimulation are effective.However,two strings for injection and production are required,resulting in higher thermal recovery development costs.In view of this,through the research on the lifting optimization,pipe string design,downhole key tools design,wellhead special equipment design,and selection of the surface supporting technology,an injection-production integration process for heavy oil thermal recovery well in offshore oilfield has been formed,realizing a breakthrough of integrated injection-production heavy oil thermal recovery process for offshore oilfields from 0 to 1.The field test results show that:the tools used in this technology have good temperature resistance.The working cylinder has a good match with the mechanical safety valve with flexible opening.The working cylinder runs smoothly.The inner pump cylinder stinger seal pressure resistance is 20 MPa,which meets the technical requirements.The total cost of the integrated process is 60%lower than that of the current process,which helps to achieve large-scale thermal recovery development of offshore heavy oil fields.