Completion Tubing Stress Analysis And Optimization Technology Research Of Thermal Horizontal Wells

Heavy oil recover with horizontal well technology developed rapidly recently due to its stable yield obvious effect, high investment efficiency. Compared with vertical wells shows great advantage. Thermal horizontal wellbore in because of its own, making the structure limits than vertical wells and steam injection condition is more complicated, which leads to casing string failure in thermal horizontal more serious than that in vertical wells. In addition, because of reservoir geologic features is commonly relatively loose sandstone reservoir, sand flow is very serious, put forward higher request for the stress environment of casing, the load type and stress position cannot be sure in horizontal wells, eventually leading to the hot casing string failure mechanism is very complicated. Therefore, the system carefully in horizontal well completion in hot casing string in different conditions and prevent damage to the mechanical analysis of heat, casing string in horizontal well completion of design and check have very important economic significance and strategic significance.Through the analysis of the casing string under steam injection process, combined with mechanics of elasticity, material mechanics, thermodynamics and the corresponding mathematical theory, established the casing stress analysis model of intensity failure and instability failure, and the corresponding formulae are derived. The result of using theory by using the computer the corresponding computational procedure established on two hot respectively in the horizontal corresponding calculation and analysis of casing string stress and deformation law. Suggestions casing string in horizontal section install thermal stress compensator, or when the completion homework assignment of casing string proper back to drag casing string processing, make due to high temperature steam role taken by thermal expansion release, so as to avoid displacement of casing string in steam injection instability and failure occurred in the process. Was deduced by energy method with initial ovality hot horizontal well completion sieve tube in theoretical formula of the resistance to squeeze intensity, discusses the sieve tube phase Angle, aperture, since, diameter-thick ratio, yield strength and initial ovality of sieve tube factors such as the influence law of resistance to squeeze strength. Advice on the design of the sieve tube use small check process, and displacement of the holes arrangement of strict control sieve tube initial ovality, appropriately increase sieve holes and cloth hole density, improve the sieve tube resistance to squeeze strength, increase oil circulation area, improve output per well purpose. Finally in theory and calculation on the basis of analysis, separately from the drill completion phase and steam injection hot pick stage the corresponding hot pick horizontal well completion set of string damage prevention measures and protect method.