赵宏波, 贾进孝, 孟令涛, 李兴宝, 孙佳才. 一种新型降水锁洗井液NDF1的性能评价及现场试验[J]. 石油钻探技术, 2015, 43(6): 87-92. DOI: 10.11911/syztjs.201506016
引用本文: 赵宏波, 贾进孝, 孟令涛, 李兴宝, 孙佳才. 一种新型降水锁洗井液NDF1的性能评价及现场试验[J]. 石油钻探技术, 2015, 43(6): 87-92. DOI: 10.11911/syztjs.201506016
Zhao Hongbo, Jia Jinxiao, Meng Lingtao, Li Xingbao, Sun Jiacai. Performance Evaluation and Field Application of a Novel Water Lock Reducing Flushing Fluid NDF-1[J]. Petroleum Drilling Techniques, 2015, 43(6): 87-92. DOI: 10.11911/syztjs.201506016
Citation: Zhao Hongbo, Jia Jinxiao, Meng Lingtao, Li Xingbao, Sun Jiacai. Performance Evaluation and Field Application of a Novel Water Lock Reducing Flushing Fluid NDF-1[J]. Petroleum Drilling Techniques, 2015, 43(6): 87-92. DOI: 10.11911/syztjs.201506016

一种新型降水锁洗井液NDF1的性能评价及现场试验

Performance Evaluation and Field Application of a Novel Water Lock Reducing Flushing Fluid NDF-1

  • 摘要: 针对鄂尔多斯盆地低渗透含油气砂岩储层水锁现象普遍,严重影响油气藏动用程度并使采收率降低的问题,通过分析影响水锁效应的因素,从降低水锁程度的角度出发,选用解水锁剂、抑制剂、防水锁表面活性剂、耐高温缓蚀剂等配制成一种新型降水锁洗井液NDF-1,对其性能进行了评价,结果表明:降水锁洗井液NDF-1能够使油水界面张力降至20 mN/m以下;岩石平均润湿角由21.6°增至78.6°;与清水相比,该洗井液能使井下管柱样品6 h和24 h的腐蚀速率分别下降89.9%和84.7%;经钻井液和完井液污染的岩心,用降水锁洗井液NDF-1冲洗后,渗透率恢复到原来的182.14%。该洗井液在鄂尔多斯盆地的CBx-c井进行了现场试验,该井采用降水锁洗井液NDF-1洗井后,产量达到原来的185.7%。室内试验及现场试验表明,降水锁洗井液NDF-1能降低低渗透油气藏的水锁效应,提高油气井的产量。

     

    Abstract: In the Ordos Basin, water lock is common in low-permeability oil and gas bearing sandstone reservoirs, and it has serious effect on oil and gas reservoir producing degree and decreases the recovery rate. After analysis was performed on the factors influencing water lock effect, a novel water lock reducing flushing fluid NDF-1 was prepared with a water lock removal agent, inhibitor, anti-water lock surfactant and high-temperature corrosion inhibitor, so as to reduce water locking degree. After its performance evaluation was completed, the flushing fluid NDF-1 was field tested in Well CBx-c in the Ordos Basin. According to the performance evaluation, the oil/water interfacial tension dropped below 20 mN/m and the average rock wetting angle increased from 21.6° to 78.6°. The corrosion rate dropped by 89.9% and 84.7%(compared with fresh water) respectively after the downhole string samples were soaked in NDF-1 for 6 hours and 24 hours. After the core contaminated by drilling fluids and completion fluids was cleaned out by NDF-1, its permeability recovered to 182.14%. Field tests demonstrated that the gas production of Well CBx-c increased to 185.7% after it was cleaned out by NDF-1. In summary, the waterlock reducing flushing fluid NDF-1 could effectively efficiently the water lock effect in low-permeability reservoirs and increase the production rate of oil and gas wells.

     

/

返回文章
返回