一次多层压裂充填技术在Ø177.8 mm套管井中的应用

Application of one-trip multistage frac-packing technology in Ø177.8 mm cased hole

车争安 修海媚 巩永刚 陈增海 谭才渊 陈胜宏

CHE Zheng’an XIU Haimei GONG Yonggang CHEN Zenghai TAN Caiyuan CHEN Shenghong

中海油能源发展股份有限公司工程技术分公司 中海石油(中国)有限公司蓬勃作业公司

Engineering Technology Branch Company, CNOOC Energy Development Co., Ltd., Tianjin 300452, China Pengbo Operation Company, CNOOC (China) Co., Ltd., Tianjin 300459, China

渤海油田Ø177.8 mm套管内通径较小，其一次多层充填防砂服务管柱的双层内管尺寸较小，无法满足压裂充填高排量的要求，只能进行逐层射孔逐层压裂充填，完井时效低，工期费用高，且不能下入分采管柱。分析了传统Ø177.8 mm套管充填防砂工具应用中存在的问题，提出了Ø177.8 mm套管一次多层压裂充填工具的国产化研制方向，即增大冲管尺寸。该套工具将防砂管柱的内通径由76.2 mm增至98.55 mm，可以下入分采管柱；服务管柱冲管外径由73.0 mm增至88.9 mm，小环空截面积达16.77 cm²，过流面积较大，摩阻较小，反循环压力可以控制在20.69 MPa以内，可以实现一次多层压裂充填。该套工具2018年在渤海油田现场应用24口井，取得了较好的经济效益，现正在渤海油田大规模推广应用。

In the Bohai Oilfield, small-sized double-layered inner pipes for one-trip multistage frac-packing string inside small-bore Ø177.8 mm casing cannot ensure the required large pump rate for frac-packing. In this case, perforations and frac-packing can only be performed stage by stage. This delivers a low completion time-effectiveness but high operation costs and failures to running production strings. After the application of conventional sand control packing tools in Ø177.8 mm casing was analyzed, a guideline for localizing a one-trip multistage frac-packing tool in Ø177.8 mm casing was put forward: increasing the wash pipe size. The I.D. of the sand control pipe string was increased from 76.2 mm to 98.55 mm, allowing for the running of a production string. The O.D. of the wash pipe in the service string was increased from 73.0 mm to 88.9 mm, delivering a sectional area up to 16.77 cm in small annulus. This sectional area allows for a large open area and small friction. The reverse circulation pressure can be controlled within 20.69 MPa, allowing for one-trip multistage frac-packing. This tool was applied in 24 wells in the Bohai Oilfield in 2018 and delivered great economic benefits. At present, this tool is widely promoted in the Bohai Oilfield.

10.13639/j.odpt.2019.05.009