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Casing sidetrack window is to improve the exploratory well success rate and hydrocarbon recovery in oil exploration , development process , an important means to increase production capacity . The technology is less of an investment , the quick increase of oil production technology , not only can shorten the drilling cycle , and can save the cost of drilling . Sidetracking technology , window directional side of the various types of wells drilled in the oil field construction, and achieved good results . Sidetracking make the dead wells resurrection , old wells update , adjust and perfect the original well pattern ; sidetracking technology enhanced oil recovery to extend the useful life of Reservoir improve ultimate oil recovery ; can fully old well site and surface facilities , save construction investment , protection of the environment ; sidetracking new geological data , to provide a basis for the re - understanding of reservoir . In sidetracking process , the formation of the borehole is the result of the interaction of the drill with the casing wall and strata , so detailed and in-depth analysis of the significance of the force at the bit . People in the past in the analysis of the bottom hole assembly , often just simple force at the bit processing, generally in the calculation of the bit as the hinge support zero displacement . Under this assumption, the drill bit bending moments is zero. If you consider the fact that drill actual size, shape and operating the sidetrack windows process , the drill is bound to by the drill pipe, guide ramp , casing , formation and other aspects of the role . Combined with the drill stress analysis , given reasonable assumptions on the basis of the establishment of the mathematical model and solving calculation . Better understanding and knowledge of the shape of the window can guide the on-site construction to ensure the use of reasonable parameters , so the window shape analysis calculation has important practical significance . It provides a theoretical analysis methods for the actual fenestration job to design a reasonable window width and length , and also work to create a good start for the back side of the drill . From the theoretical analysis of the shape of the window , you can also indirectly recognize , understand the the actual fenestration shape the general situation and provide reference for the the actual windowing process is a reasonable choice to go down tools .
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