塔河油田YT1断块深层凝析油气藏乳化油堵水技术

doi:10.13809/j.cnki.cn32-1825/te.2020.02.017

摘要/Abstract

摘要：

塔河油田YT1断块经过长时间衰竭开采,加之底水锥进,气井已普遍进入高含水阶段,气举、排水采气等常规措施不同程度失效,堵水成为后期主要接替措施。结合塔河堵水经验,以相渗调整剂作为主要研发方向,形成了以塔河中质稀油、“阴离子+非离子”复配乳化体系为主体的乳化油堵剂,地层条件下黏度达到50~60 mPa·s,对储层低伤害。通过单、双填砂管驱替实验发现,乳化油体系水相封堵率83.4 %、油相封堵率仅仅在11.9 %,具有较好的耐冲刷性、油水相态选择性和地层渗透率调整能力。乳化油堵水工艺段塞设计为“稀油隔离液+乳化油体系+稀油隔离液+清水顶替液”,不动管柱,焖井1~2 d,可实施1~2轮次。现场乳化油堵水效果较好,对同类凝析油气藏堵水有重要的指导作用。

关键词: 塔河油田, YT1断块, 凝析油气藏, 乳化油, 堵水

Abstract:

After a long time of depletion production and bottom water coning, the YT1 Fault Block in Tahe Oilfield has generally entered the high water cut stage. Conventional measures such as gas lifting, drainage and gas production have failed in some case, and water plugging has become the main replacement in the later stage. Based on the water plugging experience of Tahe Oilfield, the relative permeability adjusting agent is took as the main research and development direction, and forms the emulsified oil plugging agent is formed based on the medium dilute oil and the “anion+non-ion” compound emulsified system of Tahe Oilfield. Under the formation condition, the viscosity reaches 50~60 mPa·s, causing low damage to the reservoir. Through the single and double sand filling tube displacement experiments, it is found that the water-phase plugging rate of the emulsified oil system is 83.4 %, and that for oil-phase is only 11.9 %. Therefore, it has better erosion resistance, oil-water phase selectivity and formation permeability adjustment ability. The slug of water plugging process by emulsified oil is designed as "dilute oil acted as isolation fluid+emulsified oil system+dilute oil acted as isolation fluid+clear water displacement fluid", without moving the string, and with 1~2 days’ soaking, to implement 1~2 rounds. The field application has a good water plugging effect, providing an important guiding for the similar condensate oil and gas reservoirs in water plugging

Key words: Tahe Oilfield, YT1 Fault block, condensate reservoir, emulsified oil, water plugging

中图分类号:

TE372

秦飞,金燕林. 塔河油田YT1断块深层凝析油气藏乳化油堵水技术[J]. 油气藏评价与开发, 2020, 10(2): 101-106.

Fei QIN,Yanlin JIN. Supporting study of water plugging using emulsified oil in deep condensate reservoir of YT1 Fault block in Tahe Oilfield[J]. Reservoir Evaluation and Development, 2020, 10(2): 101-106.

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相	初始渗透率/10^-3μm²	堵后渗透率/10^-3μm²	封堵率/%
水相	956	155	83.4
油相	496	437	11.9

井号	构造位置	油层厚度/m	水平段渗透率级差	避水高度/m	初期开采情况	日产油/t			日产气/m³			含水率/%		累计增油/t
井号	构造位置	油层厚度/m	水平段渗透率级差	避水高度/m	初期开采情况	堵前	堵后		堵前	堵后		堵前	堵后	累计增油/t
YT1-1H	低	8.5	1.8	6.3	开井高含水	0.8	1.5		3 930	3 949		96.7	99.2	28
YT1-2H	次低	10.4	4.5	8.4	开井供液不足	4.9	7.2		1 200	2 472		99.7	59.3	982
YT1-2H	次低	10.4	4.5	8.4	开井供液不足	0	15		0	1 000		99.7	75.3	982
YT1-4H	高	17	3.8	12.8	低含水开采期长	1	9.3		231	1 184		92.3	67.3	1 758
YT1-4H	高	17	3.8	12.8	低含水开采期长	0	10	2 000	3 200	96.0	70.8			1 758
YT1-5H	次高	12.3	4.2	10	低含水开采期长	3.8	9.9	1 091	452	91.7	66.2	2 571
YT1-5H	次高	12.3	4.2	10	低含水开采期长	0.2	18.9	645	543	99.3	50.9	2 571