稠油油田注聚井解堵方法研究

发布时间：2018-01-04 17:02

本文关键词：稠油油田注聚井解堵方法研究　出处：《西南石油大学》2017年硕士论文　论文类型：学位论文

【摘要】：海上稠油油田自2003年逐步开展聚合物驱油技术的矿场先导试验以来,聚合物驱油技术对提高油田采收率起到了突出作用。在聚合物长期注入过程中,由于注入井堵塞,注入能力下降,不能满足配注要求,无法达到注聚方案的设计的驱油效果;此外注入压力高,长期高压运行,也给地面注入流程带来了一定的安全隐患。解堵降压增注是确保注聚高效实施的关键技术。由于堵塞物的复杂性及海上油田作业的特殊性,已有技术存在有效率低、有效期短和安全风险较大的问题。本文针对渤海稠油油田注聚井储层特征,基于稠油油田注聚井堵塞机理分析,从渗透溶胀、剥离解吸、氧化降解、酸化溶蚀等多角度出发,开展高效、安全复合解堵技术研究。(1)通过堵塞物组分分析,明确聚合物吸附滞留、胶质沥青质吸附沉积及无机垢等相互包裹缠绕形成的复杂堵塞物胶团是造成储层堵塞物的主要原因。注聚过程中近井地带伤害尤为严重,且注入水水质超标、残渣混合等因素,易在地层及完井段造成难以解除的伤害。(2)采用“稠油降粘、聚合物降解、无机垢溶蚀”的思路开展解堵液体系研究,优选可有效剥离分散油泥,降低原油黏度的稠油降粘剂体系;可大幅度降低聚合物溶液黏度,完全降解堵塞物胶团的聚合物降解剂体系;可有效溶蚀无机垢及储层岩石的无机垢溶蚀剂体系。解堵液体系与地层流体配伍性良好,腐蚀率低,解除岩心伤害能力强,具有良好的解堵效果。(3)结合解堵液体系特点,提出气液交替解堵工艺,通过气液交替注入储层,迫使液体进入储层深部,扩大液体波及面积,有效解除储层伤害。同时,气体的注入可增加地层能量,利于解堵后液体返排。(4)根据前期室内实验结果,进行了现场试验,施工后作业井产液量、产油量显著增加,解堵增油效果明显。本论文完成的研究内容及取得的研究成果,为有效解除稠油油田注聚井堵塞物问题,提供了有力的技术支持。同时,也为其他油水井堵塞研究提供了技术参考。
[Abstract]:Pilot test of offshore heavy oil field since 2003 to gradually carry out polymer flooding technology, polymer flooding technology to improve oil recovery to a prominent rate. In the long term due to polymer injection process, injection well plugging, injection ability can not meet the demand of injection, can not achieve the oil displacement effect of polymer injection scheme design the high injection pressure; in addition, high pressure operation, but also to the ground injection process has brought some security risks. Plugging decompression and augmented injection is the key to ensure the efficient implementation of the technology of poly injection. Due to the particularity of the blockage and the complexity of the offshore oil field operation, existing techniques are effective rate is low, short period of validity and security risks the larger problem. According to the Bohai heavy oil field polymer injection wells, reservoir characteristics, heavy oil plugging mechanism based on the analysis, from the osmotic swelling, stripping desorption, oxidation degradation, acid dissolution Other point of view, to carry out research on efficient plugging technology composite solution to safety. (1) by blocking composition analysis, clear polymer adsorption, asphaltene adsorption and deposition of inorganic scale are wrapped and form complex micelle blockage is caused by the main reason for reservoir blockage during polymer injection. Near wellbore damage is particularly serious, and the water quality exceed the standard, residue mixture and other factors, easy to cause the damage difficult to lift in the formation and completion period. (2) the heavy oil viscosity reduction, polymer degradation, inorganic fouling corrosion "idea to carry out the solution of the plugging fluid system, preferably can effectively peel and disperse sludge, reduce the heavy oil oil viscosity reducer system; can greatly reduce the viscosity of polymer solution, polymer degradation agent complete degradation blockage of micelles; can effectively dissolved inorganic scale and reservoir rock dissolution agent system inorganic plugging fluid system. Good compatibility with formation fluids, low corrosion rate, relieve core damage ability, has good blocking effect. (3) combined with the plugging fluid system, put forward the gas-liquid plugging process alternately, through the alternating injection of gas and liquid reservoir, forcing the liquid into the deep reservoir, the expansion of liquid spread area, effectively relieve reservoir layer damage. At the same time, gas injection can increase formation energy, for plugging after flowback. (4) according to the preliminary results from laboratory experiments, field tests were carried out, after the construction of wells liquid production, oil production increased significantly, blocking oil increasing effect is obvious. The research contents of this paper have completed and the the research results, to effectively remove heavy oil plugging problems, provide a strong technical support. At the same time, the research also provides technical reference for other oil wells blocked.

【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE53

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