赵琳,王增林,张星,杨景辉,孙玉海
ZHAO Lin,WANG Zenglin,ZHANG Xing,YANG Jinghui,SUN Yuhai

• 1:中国石化石油化工科学研究院
• 2:中国石化胜利油田分公司石油工程技术研究院

摘要(Abstract)：

针对稠油黏度大、常规降黏剂在多孔介质中与稠油作用不充分,导致稠油油藏采出程度低等问题,自主研发了高效复合自扩散降黏体系BXD,研究了该体系在不同温度、含水率等因素下对脱水稠油和W/O乳状液黏度的影响。通过沥青质红外光谱、相对分子质量、偶极矩测试以及微观形态观察等方法,研究降黏体系对稠油的主要作用机制。通过填砂管驱替实验,分析降黏体系的驱油效果及油藏适应性。研究表明,降黏体系BXD可以破坏W/O乳状液形态,含水率较低时阻止W/O乳状液的形成,随含水率增大形成O/W乳状液;BXD与油接触时可以迅速自发扩散,渗透进稠油中,削弱沥青质分子之间的氢键缔合,降低沥青质表观相对分子质量和偶极矩,部分拆散沥青质分子重叠堆砌的块状结构。BXD降黏冷采现场试验,油井增油效果明显,有望大幅度提高稠油油藏采收率。
Aiming at the lower recovery rate of the heavy oil reservoir resulted from the higher viscosity and incomplete interaction between conventional viscosity reducer and heavy oil in the porous media, an efficient and composite self-diffusion viscosity reducing system BXD was independently researched and developed,and the effect of the system on the viscosities of the dehydrated heavy oil and W/O emulsion were studied under different temperatures and watercut conditions. By means of asphaltene infrared spectrum, molecular weight, dipole moment test and microscopic morphology observation, the main mechanism of the viscosity reducing system on heavy oil was researched. Through the displacement experiment with sand-packing tube, the oil displaced effect and reservoir adaptability of the viscosity reducing system were analyzed. The results show that the viscosity reducing system BXD can destroy W/O emulsion shape, prevent the formation of the W/O emulsion when watercut is pretty lower, and form O/W emulsion with the rise of the watercut; when BXD is in contact with the oil, it can rapidly and instantaneously diffuse, seep into the heavy oil, weaken the hydrogen bond association between asphaltene molecules, reduce the apparent relative molecular mass and dipole moment of the asphaltene, and partially break up the block structure of overlapping asphaltene molecules. The field test of BXD viscosity reduction and cold production shows that the oil well has obvious oil incremental effect, which is expected to greatly improve the recovery of heavy oil reservoir.

关键词(KeyWords)： 稠油;沥青质;自扩散;降黏;采收率
heavy oil;asphaltene;self-diffusion;viscosity reduction;recovery

Abstract:

Keywords:

基金项目(Foundation): 国家科技重大专项“陆相页岩油流动机理及开采关键技术研究”(2017ZX05049-003-008)

作者(Author): 赵琳,王增林,张星,杨景辉,孙玉海
ZHAO Lin,WANG Zenglin,ZHANG Xing,YANG Jinghui,SUN Yuhai

DOI: 10.19597/j.issn.1000-3754.201911035

参考文献(References)：

• [1]殷方好,郑强田,浩然,等.稠油油藏吞吐后转氮气泡沬驱[J].大庆石油地质与开发,2013,32(2):114-117.YIN Fanghao,ZHENG Qiangtian,HAO Ran,et al.Nitrogen foam flooding inverted from huff-and-puff for heavy oil reservoirs[J].Petroleum Geology and Oilfield Development in Daqing,2013,32(2):114-117.
• [2]PAN L Y,FENG G Q,LIU J W,et al.Oil soluble polymers as a viscosity-reducing agent for super heavy oil[J].Petroleum Science and Technology,2017,35(8):747-753.
• [3]郭省学.CO2改善单56超稠油油藏蒸汽吞吐效果实验[J].大庆石油地质与开发,2018,37(4):122-126.GUO Shengxue.Experiment of CO2 improved steam huff and puff effects for Shan-56 ultra-heavy oil reservoir[J].Petroleum Geology and Oilfield Development in Daqing,2018,37(4):122-126.
• [4]吴国云,浦琳,曾顺鹏,等.稠油降黏剂SMA的合成及性能评价[J].石油天然气学报,2008,30(2):343-345.WU Guoyun,PU Lin,ZENG Shunpeng,et al.Synthesis and performance evaluation of heavy oil viscosity reducer SMA[J].Journal of Oil and Gas Technology,2008,30(2):343-345.
• [5] 许鑫,刘永建,尚策,等.稠油油藏蒸汽驱提高热利用率研究[J].特种油气藏,2019,26(2):112-116.XU Xin,LIU Yongjian,SHANG Ce,et al.Thermal utilization enhancement of steam-flooding in heavy oil reservoir[J].Special Oil & Gas Reservoirs,2019,26(2):112-116.
• [6] 吕政,李辉,丁楠,等.小洼油田中-深层特稠油多元热流体吞吐技术研究与应用[J].特种油气藏,2019,26(3):109-113.Lü Zheng,LI Hui,DING Nan,et al.Multi-component thermal fluid huff-puff technology and its application in Xiaowa Oilfield[J].Special Oil & Gas Reservoirs,2019,26(3):109-113.
• [7]吴永超,徐婷,林长志,等.低渗稠油油藏热化学复合驱油体系实验[J].大庆石油地质与开发,2017,36(2):107-110.WU Yongchao,XU Ting,LIN Changzhi,et al.Experiment on the thermochemical complex flooding system for low-permeability heavy oil reservoirs[J].Petroleum Geology and Oilfield Development in Daqing,2017,36(2):107-110.
• [8]张太亮,龚科,闵敏,等.高效油溶性稠油降黏剂CYJJ的性能评价[J].钻采工艺,2007,30(2):115-116.ZHANG Tailiang,GONG Ke,MIN Min,et al.Performance evaluation of oil-solubility viscosity reducer CYJJ[J].Drilling & Production Technology,2007,30(2):115-116.
• [9]李建波,杨海燕,钟小芳.油溶性降黏剂SWLY-1的合成及评价[J].应用化工,2012,41(3):445-447.LI Jianbo,YANG Haiyan,ZHONG Xiaofang.Synthesis and evaluation of oil-soluble viscosity reducer SWLY-1[J].Applied Chemical Industry,2012,41(3):445-447.
• [10]秦冰,罗咏涛,李本高,等.稠油油溶性降黏剂结构与性能的关系[J].石油与天然气化工,2012,41(5):499-503.QIN Bing,LUO Yongtao,LI Bengao,et al.The relationship between structure and performance of oil-soluble viscosity reducer of heavy oil[J].Chemical Engineering of Oil & Gas,2012,41(5):499-503.
• [11]张文,龙军,任强,等.沥青质分子聚集行为研究进展[J].化工进展,2019,38(5):2158-2163.ZHANG Wen,LONG Jun,REN Qiang,et al.Research progress on aggregation behavior of asphaltene[J].Chemical Industry and Engineering Progress,2019,38(5):2158-2163.
• [12]GRAY M R,TYKWINSKI R R,STRYKER J M,et al.Supramolecular assembly model for aggregation of petroleum asphaltenes[J].Energy & Fuels,2011,25(7):3125-3134.
• [13] SAHAI M,SINGH R K,KUKRETY A,et al.Application of triazine-based gemini surfactants as viscosity reducing agents of tar sand derived bituminous crude[J].Energy & Fuels,2018,32(3):3031-3038.
• [14] XU J,JIANG H,LI T,et al.Effect of comb-type copolymers with various pendants on flow ability of heavy crude Oil[J].Industrial & Engineering Chemistry Research,2015,54(19):5204-5212.