蘇53區(qū)塊強抑制性鉆井液體系研究
[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.
【學(xué)位授予單位】:東北石油大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:TE254
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