涠洲油田群强水敏储层钻井完井液伤害分析及解堵技术应用
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摘要
针对涠洲油田群强水敏储层投产后达不到配产要求、采液指数很低、表皮系数较大等问题,选取典型井WZ11-1N-A12Sa作研究对象,找出了储层损害原因,研制了水基乳液复合解堵液HJD-S并对其进行评价,得出该解堵液对油基泥浆滤饼有较好的分散、清洗能力,防破乳能力强,与地层流体、岩石的配伍性好,解堵液对钻完井液污染后的岩心具有较好的解除效果,渗透率恢复值大于100%。现场应用表明,解堵液能有效解除该井涠洲组的堵塞,实现日增油208m3,2012年增油量达4.52×104m3。
In view of that the production requirement was not satisfied with very low fluid productivity index and large skin coefficient after the strong water sensitive reservoir in Weizhou Oilfields was brought into production,an investigation was carried out with Well WZ11-1N-A12 Sa,a typical well,as the object of study. The cause for reservoir damage was identified,and a compound deplugging fluid of water-based emulsion HJD-S was developed. It has been found by evaluating the performance of this compound deplugging fluid of water-based emulsion that it is good in dispersing and cleaning oil-based mud cake with strong anti-demulsification capacity and is well compatible with formation fluid and rocks and that it has good removal effect for the rock core contaminated by drilling and completion fluid with the permeability recovery value higher than 100%. The field application has shown that this deplugging fluid can eliminate the blocking in this well effectively with daily oil production increase of 208 m3. The oil production increase was 4. 52 × 104m3 in 2012.
In view of that the production requirement was not satisfied with very low fluid productivity index and large skin coefficient after the strong water sensitive reservoir in Weizhou Oilfields was brought into production,an investigation was carried out with Well WZ11-1N-A12 Sa,a typical well,as the object of study. The cause for reservoir damage was identified,and a compound deplugging fluid of water-based emulsion HJD-S was developed. It has been found by evaluating the performance of this compound deplugging fluid of water-based emulsion that it is good in dispersing and cleaning oil-based mud cake with strong anti-demulsification capacity and is well compatible with formation fluid and rocks and that it has good removal effect for the rock core contaminated by drilling and completion fluid with the permeability recovery value higher than 100%. The field application has shown that this deplugging fluid can eliminate the blocking in this well effectively with daily oil production increase of 208 m3. The oil production increase was 4. 52 × 104m3 in 2012.
引文
[1]王昌军,艾俊哲,王正良,等.涠洲油田油基钻井液黏稠物的形成机理[J].钻井液与完井液,2010(5):25-27.
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[2]赵福麟.油田化学[M].东营:石油大学出版社,2002:60-80.
[3]王荐,岳前升,吴彬,等.油基钻井液井筒清洗技术室内研究[J].海洋石油,2008,28(4):73-76.
[4]穆金峰.超深稠油注水井生物解堵研究与应用[J].新疆石油天然气,2010,6(1):49-51.