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Calculation Method For Pressure Drop Along Downhole Bending Section Of Coiled Tubing
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| 2017-04-13 |
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| With the development of fracturing technologies,
fracturing process and string structures become more and
more complicated, especially the curvature radius of pipe
string in downhole bending section is varying from a few
meters to thousands of meters. The numerical simulation
model for straight pipes and bends was established by
means of numerical simulation based on the geometric
characteristics of coiled tubing. Then, the on-way
pressure drop in different working conditions was
calculated and compared with the theoretical calculation
result. It is verified that the numerical model is
accurate with the error of bend and straight pipe lower
than 5% and 6% respectively. The pressure drop along the
bend with curvature radius of 1.25-1280m was calculated
and then compared with the numerical simulation result.
It is shown that the numerical simulation result
coincides well with the theoretical calculation result
when the curvature radius of bend is shorter than a
certain critical value, the theoretical calculation
result of bend is lower, and even lower than the pressure
drop of straight pipe. Finally, the theoretical pressure
drop formula of bend was corrected according to the
numerical simulation results. It broadens the calculation
range of pressure drop calculation formula of bends, and
provides the reliable calculation formula for the
pressure drop of bend structures, such as coiled tubing. |
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