玛湖凹陷上乌尔禾组强敏感油藏CO2同步吞吐试验

doi:10.7657/XJPG20240313

摘要/Abstract

摘要：

为探索玛湖凹陷强敏感致密砾岩油藏水平井压裂后高效开发提高采收率技术，在玛湖1井区开展注CO₂同步吞吐试验。结果表明：CO₂同步吞吐可提高强敏感致密砾岩油藏采收率，驱油机理主要是萃取、混相、竞争吸附、膨胀驱替等；裂缝沟通是导致气窜的主要原因，通过现场调控，实现井组与气窜井同步焖井，保证现场实施效果；试验井组受压裂液浸泡导致黏土矿物水化膨胀，造成喉道封堵，渗流能力减弱，影响了CO₂波及范围，导致阶段换油率较低。CO₂同步吞吐试验取得了较好的增油效果，试验井组阶段增油量为3 983 t，换油率为0.36，该试验为强敏感致密砾岩油藏水平井压裂后提高采收率提供了技术思路及矿场经验。

关键词: 玛湖凹陷, 上乌尔禾组, 致密砾岩, CO₂同步吞吐, 敏感性, 提高采收率

Abstract:

In order to explore the post-fracturing EOR technologies for efficient development of highly sensitive tight conglomerate oil reservoirs in horizontal wells in the Mahu sag, a simultaneous CO₂ huff-n-puff test was carried out in the Mahu 1 well block. The results show that simultaneous CO₂ huff-n-puff can enhance oil recovery of highly sensitive tight conglomerate reservoirs, and its oil displacement mechanisms mainly include extraction, miscibility, competitive adsorption, and expansive displacement. Fracture communication is the main cause of gas channeling. Through field regulation and control, synchronous soaking of well groups and gas channeling wells was achieved, ensuring the field implementation effect. Soaked by fracturing fluid, the clay minerals in the tested well group hydrate and expand, causing pore throat blockage, which affects CO₂ swept range and results in a low interim oil exchange ratio. The simultaneous CO₂ huff-n-puff test achieved favorable stimulation effects, with an interim oil increment of 3,983 tons and an oil exchange ratio of 0.36 in the tested well group. This test provides technical ideas and field experience for horizontal wells in enhancing oil recovery of highly sensitive tight conglomerate reservoirs after fracturing.

Key words: Mahu sag, upper Wuerhe formation, tight conglomerate, simultaneous CO₂ huff-n-puff, sensitivity, EOR

中图分类号:

TE341

宋平, 崔晨光, 张记刚, 刘凯, 邓振龙, 谭龙, 禹希科. 玛湖凹陷上乌尔禾组强敏感油藏CO₂同步吞吐试验[J]. 新疆石油地质, 2024, 45(3): 355-361.

SONG Ping, CUI Chenguang, ZHANG Jigang, LIU Kai, DENG Zhenlong, TAN Long, YU Xike. Simultaneous CO₂ Huff-n-Puff Test in Highly Sensitive Reservoirs in Upper Wuerhe Formation, Mahu Sag[J]. Xinjiang Petroleum Geology, 2024, 45(3): 355-361.

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井名	目的层埋深/m	水平段长度/m	油层钻遇率/%	压力系数	地层压力/MPa	井距/m	压裂段数	簇数
M1井	3 532	818	100	1.2	41.58	200	8	14
M2井	3 547	1 200	100	1.2	41.76	200	17	33
M3井	3 566	1 223	100	1.2	41.98	200	17	33
M8井	3 602	1 600	100	1.2	45.45	260	18	87
M9井	3 601	1 601	100	1.2	45.45	260	18	99

井名	基本情况							CO₂吞吐参数
井名	投产日期/ 年-月-日	孔隙度/ %	含油饱和度/%	改造段长度/m	初期日产油量/t	初期日产液量/t	自喷天数/d	注入压力/ MPa	注气速度/ （t·d^-1）	累计注气量/t	焖井时间/d
M1井	2019-10-10	6~17（10）	44~76（63）	491	4.3	8.8	235	15.3	14.0~50.7（43.9）	1 450.0	45
M2井	2019-10-10	7~13（10）	49~65（62）	1 200	15.4	34.1	310	13.3	12.6~80.2（47.8）	4 492.3	45
M3井	2019-06-12	5~21（9）	34~82（59）	1 223	22.0	38.7	387	19.1	6.6~84.2（62.7）	5 075.2	45
井名	吞吐前生产情况					吞吐后初期生产情况			吞吐后开井生产天数/d	目前日产油量/t	累计增油量/t
井名	日产油量/t	日产液量/t		含水率/%	累计产油量/t	油嘴/mm	油压/MPa	日产油量/t	吞吐后开井生产天数/d	目前日产油量/t	累计增油量/t
M1井	0.1	0.6		83.3	2 650.5	3~4	16.17	6.2	299	0.4	417.3
M2井	0.2	1.0		80.0	7 009.0	3~4	11.68	7.2	299	1.0	811.2
M3井	0	0.1		73.1	5 828.4	3~4	11.99	6.5	299	1.8	395.4

玛湖凹陷上乌尔禾组强敏感油藏CO₂同步吞吐试验

Simultaneous CO₂ Huff-n-Puff Test in Highly Sensitive Reservoirs in Upper Wuerhe Formation, Mahu Sag

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