Abstract: To establish the green development conceptions of cost-effectiveness, low damage and environmental-friendliness, an efficient crosslinking agent was developed for low-permeability reservoirs. The crosslinking agent is based on long-chain multi-point chelating technology to increase the chain length of crosslinking agent. The ternary composite gel-breaking technology was developed to solve the bottlenecks of low temperature (20-40℃)of CBM well and gel breaking. With the formula system of the 30-163℃) fracturing fluid series developed, the consumption of thickening agent was reduced by 30-50 percent and the formation damage rate reduced by 30-40 percent under the same temperature condition while the material cost was lowered by more than 30 percent. The lowest crosslinking limit of the crosslinkiing agent reaches 0. 10 percent. This crosslinking agent was used in 1368 intervals at 979 wells in Changqing Oilfield, Jidong Oilfield, Huabei Oilfield, Turpan-Hami Oilfield and CBM fields, with a success rate of 100 percent. The production of tested wells was increased by 2.5 to 5.3 times, allowing a promising prospect for application. It provides technical support for effective development of lowpermeability oil and gas reservoirs and tight oil and gas reservoirs.

Key words: ultra-low concentration, hydroxypropyl guar gum, fracturing fluid system, crosslinker, gel-breaker

摘要： 为符合低成本、低伤害、环保绿色开发的理念, 针对低渗透储层特点, 利用长链多点螯合技术, 增加交 联剂链的长度, 研发了高效交联剂; 针对煤层气井温度低(20~40℃)、破胶困难等难题, 开发了三元复合破胶技术; 形成了30~163℃压裂液系列配方体系, 相同温度条件下, 稠化剂用量降低30% ~50%, 对储层的伤害率降低了30% ~ 40%, 材料成本降低30%以上, 实现稠化剂交联下限至0. 10%。在长庆油田、冀东油田、华北油田、吐哈油田、煤层气 田等推广应用979 井1368 层(段), 施工成功率100%, 试验井产量分别为对比井的2. 5~5. 3 倍, 展示出良好的应用前 景, 为低渗特低渗油气藏、致密油气藏的高效开发提供技术保障。

关键词: 超低浓度; 羟丙基瓜尔胶; 压裂液体系; 交联剂; 破胶剂