A Calculation Method of Hook Load of Oil Drilling Rig
A technology of hook load and calculation method, applied in the direction of calculation, instrument, geometric CAD, etc., can solve the problems of complex calculation model and cumbersome calculation process, and achieve the effect of ensuring accuracy and reliability.
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Embodiment 1
[0040] Any wellbore has two parameters: vertical well depth and horizontal displacement. The pipe string entering the well is mainly composed of drilling pipe strings or casing strings such as drill pipes, heavy drill pipes and drill collars; the hook load is based on the above data as the main known Conditions, the vertical and horizontal forces are calculated respectively according to the invented model, superimposed or subtracted to obtain the hook load under different working conditions.
[0041] It includes the following steps:
[0042] a. Determine the number of key well depth points according to the wellbore track or trajectory;
[0043] b. Obtain the basic data for calculation;
[0044] c. Find the force T caused by the vertical v , the unit is cattle; the calculation formula is:
[0045]
[0046] In the formula: j is the vertical segmentation variable, dimensionless; q ej is the effective weight per unit length of the jth vertical string, in N / m; ΔH vj is the ...
Embodiment 2
[0059] In the step b, the basic calculation data obtained: drilling depth, vertical depth, wellbore structure (including opening times, wellbore size, well depth, casing outer diameter and lower depth), wellbore trajectory or data (including measurement depth, vertical depth, inclination angle, azimuth angle, north coordinate, east coordinate, full angle change rate), drilling tool assembly parameters (including drilling tool name, outer diameter, single length, unit length weight, quantity, length), use Drilling fluid density system name, density;
[0060] In the step c, the upper boundary m of the vertical segmentation variable j is determined by the number of different unit length weights exhibited by the well-entry pipe string in the vertical direction. For example, in the vertical direction of the well entry pipe string, there are 18 φ88.9mm drill pipes + 21 φ127mm weighted drill pipes + 36 φ127mm drill pipes, and the weights per unit length are 19.80, 75.27, and 32.62kg / ...
Embodiment 3
[0069] In the step d, the upper boundary n of the well depth segmentation variable i is determined according to the wellbore trajectory or the number of key well depth points of the trajectory minus 1. For example, the number of key well depth points in a wellbore track is 8, then the upper boundary n value is 7;
[0070] In the step d, the upper boundary p of the horizontal segmentation variable k is determined according to the weight per unit length of the well-entry pipe string in the horizontal direction of the wellbore. For example, the 324m total horizontal displacement H of a well h The drill string is 3 φ88.9mm drill pipes + 9 φ127mm weighted drill pipes + 24 φ127mm drill pipes, and the unit length weights are 19.80, 75.27, 32.62kg / m, and a single φ88.9mm drill pipe, The length of the φ127mm weighted drill pipe and the φ127mm drill pipe are both 9m, then the horizontal segmentation variable p is 3, and the total horizontal displacement H h The segment lengths are 27m...
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