第40卷第3期
天然气勘探与开发
工程与管理
可降解纤维暂堵转向压裂技术的室内研究及现场试验
尹俊禄刘欢池晓明孙新龙中国石油川庆钻探工程公司长庆井下技术作业公司
要针对鄂尔多斯盆地苏里格气田特低渗透气藏气并压后单并产量不高、经济效益不望想的问题，研发了可降解纤维暂摘
堵转向压裂技术。该技术通过向储层裂缝中注入暂堵剂纤维，形成替堵压力，追使裂缝发生转向，进增大有效渗流面积以提高单并产量。通过室内优化评价试验，优选出暂堵用可降解纤维直径为10um、长度为8mm、混砂加入量为12%时暂堵效果最佳，降解性能良好，对储层渗透率伤害较小，通过现场试验结合裂缝监测技术，验证了暂堵转向纤维进入储层后，压力上升明显，裂缝发生了转向，可以实现人工裂续强制转向，达到沟通有利储层的目的，可降解纤维督堵转向压裂技术在现场应用有效、可行，且取得了较好的改造效果。该技术现场操作简单、应用效果良好，为苏里格气田特低渗透气裁开发提供了新的思路，
关键词鄂尔多斯盆地苏里格气田水力压聚可降解纤维
暂堵裂缝转向改造体积纤维降解性
储层伤害
室研究现场试验
DOl: 10.12055/gaskk.issn.1673-3177.2017.03.018
实验
Experimental studyandfieldtestofdegradablefiberbasedtemporaryplugging
and diversion fracturing technology Yin Junlu, Liu Huan, Chi Xiaoming,Sun XinLong
(ChangqingDownholeOperation Company,CNPC ChuanqingDrillingEngineering CompanyLimited,Xi'an, Shaanxi710018,China)
Abstract: After fracturing is carried out in the extra-low permeability gas reservoirs in Sulige Gasfield, the Ordos Basin, the sin-gle-well production rate is low and the economie benefit is unsatisfactory. To solve this problem, a degradable fiber based temporary plugging and diversion fracturing technology was proposed. By virtue of this technology, the fiber, as the temporary plugging agent, is injected into reservoir fractures to form the temporary plugging pressure, which forces the fractures to divert, Thus, the effective seepage area is increased and single-well production rate is correspondingly improved. Laboratory optimization evaluation test was performed to optimize the degradable fiber for temporary plugging. It is shown that the temporary plugging effect is the best, degrada-tion performance is good and the damage on reservoir permeability is less, when the diameter and length of degradable fiber are 10 μm and 8 mm, respectively, and sand content is 12%e. It is demonstrated by field test together with fracture monitoring technology that the pressure increases significantly and fractures are diverted after the fibers for temporary plugging and diversion are injected into reser-voirs. Consequently, artificial fractures are forced to divert and favorable reservoirs are communicated. It is verified that the degrad-able fiber based temporary plugging and diversion fracturing technology is feasible and effective in field application, presenting better stimulation results. To sum up, this technology is advantageous with simple operation and good application effect, and provides a new idea for the development of extra-low permeability gas reservoirs in Sulige Gasfield.
Keywords: Ordos Basin; Sulige gasfield; Hydraulie fracturing; Degradable fiber; Temporary plugging; Fracture diversion; Stimulated reservoir volume (SRV); Fiber degradability; Reservoir damage; Experimental study; Field test
鄂尔多斯盆地苏里格气田针对特低渗透气藏，通过多年的研究与试验，以“单缝优化”为设计理念，结合储层特征形成了多系列的压裂改造技术。然而“单缝优化”设计理念裂缝单一，改造效果有限，不能充分动用气藏储量，采收率低。目前苏里格气田
现有的压裂技术压后单井产量不高，经济效益不理想。为此，开展了纤维暂堵转向压裂技术研究[1-7] 其实质是先压开新缝或张开旧裂缝，然后加入纤维暂堵剂封堵一定缝长的裂缝，形成较为牢靠的封堵隔层，随着压裂液的票入形成高压产生暂堵压力。
第一作者：尹俊禄，1985年生，工程师；从事压裂设计优化和压后评估工作以及压裂工艺技术研究工作。地址：（710018）陕西省西安市未央区风城四路长庆大厦1202室。电话：（029）86597903.E-mail:cqix_yinjl@cnpc.com.cn
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