A method of floating into the screen pipe

Abstract

The invention discloses a method for floating and running a screen. For the open-hole independent screen sand control or open-hole gravel filling process, firstly, the screen running position and the length of the screen are determined according to the trajectory of the wellbore, the characteristics of the reservoir, and the specific gravity of the drilling fluid. On this basis, carry out friction analysis, calculate the buoyancy required when running into the screen pipe, and then determine the appropriate double-layer flushing pipe closed annulus volume, thereby determine the parameters such as the outer diameter and length of the flushing pipe; The outer string, the middle string, and the inner string are finally installed with a packer. In this way, the closed annular space formed between the middle string and the inner string can realize the floating and lowering of the screen string. When the inner pipe string is pressurized or suppressed, the sealing plug can be opened to ensure the smooth flow of the inner pipe string, and minimize the influence of frictional resistance on the running of the screen, so that the screen can be run safely and quickly, and side flushing can be realized side, so that the screen string can be run smoothly to the design position.

Description

technical field [0001] The invention belongs to the field of petroleum and natural gas exploitation, and relates to a method for floating and lowering screen pipes in the well completion process. Background technique [0002] Extended reach well technology is an important technology for developing marginal oil fields, reducing drilling platforms, and improving the overall development efficiency of offshore oil fields. Prominent features of extended-reach horizontal wells Extended-reach horizontal wells generally have a long horizontal section, and the pipe string is greatly affected by borehole friction during construction. In the downhole screen operation of extended-reach well completion, due to the large friction between the screen and the casing and the open hole wall, and the long open hole section, it is difficult to run the screen. Once the screen is blocked, the upper pipe string It is difficult to apply effective weight to complete the lowering, the processing mean...

AI Technical Summary

Problems solved by technology

Failure to effectively reduce the buoyant weight of the screen will result in greater friction and make it difficult for the screen to be lowered into place

Images