可联动空芯斜向器定向射孔技术

Oriented perforation with coordinated hollow whipstock

为沟通主井眼和分支井眼,且不损伤主井眼套管,使用穿深和孔径可控的射孔器,辅以校深和管串定向技术,利用炸药的聚能效应,形成高温高速的金属射流,在斜向器盖板要求位置进行射孔,形成斜向器两侧间的流通通道。在地面对射孔器射孔性能进行模拟试验,射孔器均可靠穿孔,在斜向器不到3 m的射孔长度内,各孔道面积之和大于3018 mm^(2),相当于73 mm油管内孔面积。在南海油田大斜度井XXS1井和XXS2井应用,实现了在斜向器要求位置射孔,角度偏移在10°以内,射孔后主井眼与分支井眼间流动顺畅,成功率100%。该技术填补了南海油田定向射孔领域的空白,成功助力增储上产,为后续油气田开发提供了借鉴。

To communicate the mainbore and the lateral without damaging the casing in the mainbore,a perforator with controllable penetration depth and aperture is used,together with the depth correction and string orientation technology,to perforate at the target position of the whipstock cover,so as to create flow channels between the sides of the whipstock.In this process,the energy-gathering effect of explosives is considered to form high-temperature and high-speed metal jets.The performance of the perforator was simulated on the ground,indicating that the perforator works reliably,with the total area of perforation channels within the length of less than 3 m of the whipstock greater than 3018 mm^(2),which is equivalent to the area of the inner hole of 73 mm tubing.The technology was successfully applied for perforation at the target position of the whipstock in two highly deviated wells(XXS1 and XXS2)in Nanhai Oilfield,with the angle offset less than 10°and the smooth flow achieved between the mainbore and the lateral,suggesting a success rate of 100%.This technology fills the gap in the field of oriented perforation in Nanhai Oilfield to successfully increase the reserves and production.It provides a reference for subsequent oil and gas field development.