致密油水平井中低温可降解暂堵剂研发与性能评价
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摘要
水平井分段多簇体积压裂推动了非常规油气藏开发的技术革命,暂堵压裂通过开启复杂缝网提高改造体积成为致密油提高单井产量的重要技术手段。鄂尔多斯盆地致密油资源丰富,具有低渗、低压、低丰度特点,目前使用的暂堵剂在致密油水平井储层改造过程中承压差、难降解、储层伤害大,实施效果不理想。根据该盆地致密油储层特征和工艺改造需求,通过生物可降解脂肪族聚内酯合成与生物小分子降解促进剂优选,开发了一种中低温可降解暂堵剂。室内性能评价表明,暂堵剂相对密度适中,具有良好的热稳定性、机械力学性能、封堵性能、降解性能。现场矿藏试验暂堵转向效果良好,改造体积明显提高,在致密油水平井分段多簇体积压裂中表现出良好的适用性,为非常规油气藏高效开发积累了宝贵经验。
The horizontal well multi-cluster volumetric fracturing brings about a technological revolution in the development of unconventional oil and gas reservoirs. Temporary plugging and fracturing is an important technical means to increase the volume of compact oil by increasing the volume of compaction through further opening complex seams. The Ordos Basin is rich in tight oil resources, and the reservoir has the characteristics of low permeability, low pressure and low abundance. The temporary plugging agent currently used in the process of reservoir reform of tight oil horizontal wells shows pressure difference, refractory degradation and high damage to the reservoir. The implementation effect is not satisfactory. According to the characteristics of tight oil reservoirs and process modification in the Ordos Basin, a medium-low temperature degradable temporary plugging agent was developed through biodegradable aliphatic polylactone synthesis and biomolecular degradation promoter. The indoor performance evaluation shows that the temporary plugging agent has a moderate specific gravity and has good thermal stability, mechanical properties,plugging performance and degradation performance. The on-site mineral test has a good steering effect and a significant improvement in the volume of the reformation. It has shown good applicability in the segmental multi-cluster volume fracturing of tight oil horizontal wells, and accumulated valuable experience for the efficient development of unconventional oil and gas reservoirs.
The horizontal well multi-cluster volumetric fracturing brings about a technological revolution in the development of unconventional oil and gas reservoirs. Temporary plugging and fracturing is an important technical means to increase the volume of compact oil by increasing the volume of compaction through further opening complex seams. The Ordos Basin is rich in tight oil resources, and the reservoir has the characteristics of low permeability, low pressure and low abundance. The temporary plugging agent currently used in the process of reservoir reform of tight oil horizontal wells shows pressure difference, refractory degradation and high damage to the reservoir. The implementation effect is not satisfactory. According to the characteristics of tight oil reservoirs and process modification in the Ordos Basin, a medium-low temperature degradable temporary plugging agent was developed through biodegradable aliphatic polylactone synthesis and biomolecular degradation promoter. The indoor performance evaluation shows that the temporary plugging agent has a moderate specific gravity and has good thermal stability, mechanical properties,plugging performance and degradation performance. The on-site mineral test has a good steering effect and a significant improvement in the volume of the reformation. It has shown good applicability in the segmental multi-cluster volume fracturing of tight oil horizontal wells, and accumulated valuable experience for the efficient development of unconventional oil and gas reservoirs.
引文
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[3]李忠兴,屈雪峰,刘万涛,等.鄂尔多斯盆地长7致密油合理开发方式探讨[J].石油勘探与开发,2015,42(2):217-221.
[4]翁定为,雷群,胥云,等.缝网压裂技术及其现场应用[J].石油学报,2011,32(2):280-284.
[5]王博,周福建,邹雨时,等.水平井暂堵分段缝间干扰数值模拟方法[J].断块油气田,2018,25(4):506-509.
[6]董大忠,王玉满,李新景,等.中国页岩气勘探开发新突破及发展前景思考[J].天然气工业,2016,36(1):19-32.
[7]杨同玉,张福仁,孙守港.屏蔽暂堵技术中暂堵剂粒径的优化选择[J].断块油气田,1996,3(6):50-54.
[8]REDDY B R,CORTEZ J.Activator development for controlling degradation rates of polymeric degradable diverting agents[R].SPE164117,2013.
[9]TSI H Y,TSEN W C,SHU Y C,et al.Compatibility and characteristics of poly(butylene succinate)and propylene-co-ethylene copolymer blend[J].Polymer Testing,2009,28(8):875-885.
[10]WANG L S,CHENG S X,ZHUO R X.Synthesis and hydrolytic degradation of aliphatic polycarbonate based on dihydroxyacetone[J].Polymer Science,2013,55(11/12):604-610.
[11]韩伟,张敏,宋洁,等.对生物降解聚合物PBS共聚改性的研究[J].塑料,2008,37(3):87-89.
[12]何乐,郭宁,陈复生,等.我国淀粉基生物可降解材料的研究进展[J].化工新型材料,2015,43(4):4-5.
[13]赖南君,陈科,马宏伟,等.水溶性压裂暂堵剂的性能评价[J].油田化学,2014,31(2):215-218.
[14]刘强.耐高温高强度暂堵剂的研制与应用[J].精细石油化工进展,2016,17(2):31-33.
[15]杨建清,李伟涛,焦保雷,等.适用于高温高盐油藏控水的耐温耐盐堵剂[J].断块油气田,2017,24(6):867-870.
[16]周福建,伊向艺,杨贤友,等.提高采收率纤维暂堵人工裂缝动滤失实验研究[J].钻采工艺,2014,37(4):83-86.