【摘要】 煤层气储层在钻完井、压裂增产以及生产过程中,外来流体的侵入极容易引起煤储层的水锁伤害,从而严重影响煤层气井的产量。因此,室内通过大量实验,以新型氟碳表面活性剂FT-11为主要处理剂,研究了一种适合煤层气储层的新型防水锁处理剂体系HFSJ-1,并对其综合性能进行了评价。结果表明,该新型防水锁处理剂体系能够使水溶液的表面张力降低至20 m N/m以下,能使目标区块煤样表面的接触角由26.1°增大至74.3°,具有良好的表面活性和润湿反转性能;另外,HFSJ-1的加入能使煤岩心的自吸水量大幅下降,使煤层气的解吸时间大幅缩短,并能显著提高煤岩心的渗透率恢复值,其性能明显优于常用的防水锁处理剂,有效降低了水锁伤害的程度。现场试验结果表明,煤层气井使用新型防水锁处理剂体系HFSJ-1后,与未使用防水锁处理剂的邻井相比产气量得到大幅提升,表皮系数显著下降,达到了良好的施工效果。更多还原

【Abstract】 In the process of drilling and completion,fracturing stimulation and production of CBM reservoirs,the invasion of someother fluid is very easy to cause water lock damage of coal reservoirs,thus seriously affecting the production of CBM wells. Therefore,through a large number of laboratory experiments,a new type of waterproof lock agent HFSJ-1 suitable for coalbed methane reservoir is studied with FT-11 as the main treatment agent,and its comprehensive performance is evaluated. The results show that the new water-proof lock agent system can reduce the surface tension of water solution to below 20 m N/m,increase the contact angle of coal sample surface from 26. 1°to 74. 3°,having good surface activity and wettability reversal performance. In addition,the addition of HFSJ-1 can greatly reduce the self-absorbency of coal core,shorten the desorption time of coal methane,and can significantly reduce the desorption time of coal methane. Its performance is obviously superior to the commonly used waterproof lock treatment agent,which effectively reduces the degree of water lock damage. Field test results show that compared with adjacent wells without water-proof lock agent,the gas production of CBM wells with new water-proof lock agent system HFSJ-1 has been greatly increased,and theskin factor has been significantly reduced,and good operation effect has been achieved.更多还原