苏53区块强抑制性钻井液体系研究

发布时间：2019-01-06 11:21

【摘要】：苏里格区块普遍存在上部地层承压能力低,下部斜井段“双石层”易塌,提高钻井液密度,易引发井漏。在大斜度井段中井壁稳定差,跨塌严重,容易遇阻、遇卡,“双石层”易垮塌地层正好处于大斜度井段,这不仅增加了垮塌井段的长度,同时井筒内的力学稳定平衡也发生根本的变化。这是导致水平井斜井段、水平段易发生井塌复杂和事故的致命因素。水平井由于裸露的气层段长,钻井液与气层的接触面积增大,钻井时间相对较长,气层污染的可能性增大。这些问题都严重制约了钻井施工的正常进行,对强抑制性钻井液体系的研究是十分重要的。本文通过对苏53区块的储层研究,分析存在的问题,进行强抑制性钻井液体系研究,开展室内配方及评价试验,优选了两性离子磺酸共聚物替换了原有机硅体系配方多种降滤失剂及增粘剂,并引入仿生固壁剂GBFS-1,通过调整有机硅加量,形成了仿生井眼强化型钻井液体系配方。将原有机硅钻井液体系中的降滤失剂(SMP-2、SPNH、KH-931)用两性离子聚合物磺酸盐替代,同时聚合物具有强包被能力,减少泥页岩的水化膨胀;加入仿生固壁剂GBFS-1强化近井壁岩石强度,维持井壁的稳定。新形成的钻井液体系具有较好的防塌能力。综合考虑力学和化学因素,应用仿生防塌理念大幅改善了近井壁岩石强度,井壁稳定效果突出,具有良好的防塌能力。开展现场试验,通过总结分析,完善了仿生井眼强化型钻井液体系配方及现场施工工艺。
[Abstract]:In Sulige block, the upper formation has low bearing capacity, and the "double rock layer" in the lower inclined well section is easy to collapse, thus increasing the density of drilling fluid and easily causing well leakage. In the large slope well section, the wall stability is poor, the collapse is serious, it is easy to be blocked, and the easily collapsing formation of the "double rock layer" is just in the high slope well section, which not only increases the length of the collapse well section, but also increases the length of the sloughing well section. At the same time, the equilibrium of mechanical stability in the wellbore also changed fundamentally. This is the fatal factor leading to the horizontal well slanting section and the complex well collapse and accident in the horizontal section. Due to the length of exposed gas formation, the contact area between drilling fluid and gas reservoir increases, the drilling time is relatively long, and the possibility of gas reservoir pollution is increased. These problems have seriously restricted the normal drilling operation, and it is very important to study the strongly restrained drilling fluid system. In this paper, the reservoir of Su53 block is studied, the existing problems are analyzed, the strong inhibition drilling fluid system is studied, and the laboratory formula and evaluation tests are carried out. Amphoteric ionic sulfonic acid copolymers were selected to replace various filtrate reducers and tackifiers of the original silicone system. The bionic wall fixing agent GBFS-1, was introduced to form the bionic wellbore reinforced drilling fluid system by adjusting the amount of organosilicon. The filtration reducer (SMP-2,SPNH,KH-931) in the original silicone drilling fluid system was replaced by amphoteric polymer sulfonate, and the polymer had strong encapsulation ability to reduce the hydration expansion of shale. Adding bionic wall fixing agent GBFS-1 to strengthen the strength of the rock near the shaft wall to maintain the stability of the shaft wall. The newly formed drilling fluid system has good sloughing ability. Considering the mechanical and chemical factors, the bionic anti-sloughing concept has been applied to improve the strength of the rock near the shaft wall, and the stability of the shaft wall is outstanding, and it has a good anti-sloughing ability. The field test was carried out, and the formula of bionic borehole reinforced drilling fluid system and the field construction technology were improved by summing up and analyzing.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE254

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