泾河油田水平井防漏堵漏及储层保护技术研究

发布时间：2018-07-05 12:09

  本文选题：泾河油田 + 水平井　； 参考：《西南石油大学》2015年硕士论文

【摘要】：泾河油田在油气勘探开发过程中第四系、志丹群、延长组等地层出现了渗漏和较为严重的井漏,揭开油层过程中缺乏有效的储层保护措施。为了有效预防井漏,提高堵漏的成功率,实现提速目标,确保评估油层的准确性和及时性,提高油产量,开展本研究。本研究主要是用弹性断裂力学有限元法来确定随井筒钻井液柱压力变化裂缝宽度变化情况,目的是通过计算机模拟,找出裂缝宽度变化与井筒压差的关系,最终建立裂缝宽度与井筒压力、地层岩石力学特性参数及裂缝长度的预测模型。研究结合上部漏失的主要层位Q4、志丹群的具体情况,研究形成了防漏、循环段塞堵漏、1-6mm缝宽桥接堵漏配方及施工工艺,堵漏承压达到6MPa。针对目的层延长组的井漏,研究形成了保护储层的酸溶性防漏堵漏体系配方及其施工工艺,防漏体系对缝宽200-300 1um裂缝具有较好的防漏效果,封堵率可达100%,承压可以达到8MPa；酸溶性堵漏配方对1-5mm缝宽具有较好的堵漏效果,承压达到6MPa。对于漏层不好判断、漏失空间大、水层等情况,桥接堵漏措施不能解决时,形成了高失水浆等恶性漏失堵漏配方及工艺。由于储层的吼道半径1μm以下,常规的处理剂粒径很难达到封堵的要求,通过加入纳米乳液形成的体系在低孔低渗储层近井壁处快速形成致密的封堵带,封堵率达到99%以上,岩心渗透率恢复率平均达到87%,可阻止外来固相、液相侵入储层深部伤害地层。相关技术在JH17P11井、JH2-1井和JH69P25井得到了成功应用,有效防止了渗漏,堵漏成功率100%,储层保护取得明显效果。
[Abstract]:In the process of exploration and development of oil and gas in Jinghe Oilfield, the formation of Quaternary, Zhidan Group and Yanchang formation appeared leakage and serious well leakage, and the effective reservoir protection measures were lacking in the process of uncovering the reservoir. In order to effectively prevent well leakage, improve the success rate of plugging leakage, achieve the goal of increasing speed, ensure the accuracy and timeliness of reservoir evaluation, and increase oil production, this study is carried out. In this paper, the finite element method of elastic fracture mechanics is used to determine the variation of fracture width with the pressure of wellbore drilling fluid string. The purpose of this study is to find out the relationship between the change of fracture width and the pressure difference of wellbore through computer simulation. Finally, the prediction models of fracture width, wellbore pressure, formation rock mechanics parameters and fracture length are established. Combined with the specific situation of Q4 and Zhidan group of upper layer leakage, the leakage prevention formula and construction technology were formed. The leakage plugging formula and construction technology of 1 ~ 6 mm wide bridge joint in circulating slug were obtained, and the plugging pressure was up to 6 MPA. According to the well leakage in the Yanchang formation of the target layer, the formula of acid soluble leakage and plugging system and its construction technology for protecting reservoir are studied. The leakage prevention system has good leakage prevention effect on the fracture width of 200-300 1um, the plugging rate can reach 100 and the pressure can reach 8MPa. The acid-soluble plugging formula has a good effect on the gap width of 1-5mm, and the pressure can reach 6 MPA. When the leakage layer is difficult to judge, the leakage space is large, the water layer and so on, the bridge plugging measures can not be solved, the formulation and process of the malignant leakage plugging such as high water loss pulp are formed. Because the radius of the reservoir is less than 1 渭 m, it is difficult to meet the requirement of sealing by the conventional particle size of the treating agent. By adding the system formed by nano-emulsion, the tight sealing zone is formed rapidly near the well wall of the low porosity and low permeability reservoir, and the plugging rate is over 99%. The average recovery rate of core permeability is 87, which can prevent the external solid and liquid phase from invading the deep formation of the reservoir. The related techniques have been successfully applied in well JH17P11, well JH2-1 and well JH69P25, effectively preventing leakage, plugging success rate of 100, and achieving obvious results in reservoir protection.
【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE243;TE358

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本文编号：2100161