The Related Technology Research Of Horizontal Well String

With the wide application of horizontal drilling technology in the oil drilling, borehole bending the drill string by force and deformation are also paid more and more widespread attention to. The shape of the curve in the wellbore trajectory of horizontal wells is a complex three-dimensional space curve of arbitrary curvature and torsion. Its curved shape greatly affects the status of the column by the force and analysis of the follow-up column mechanics. In this paper, method of the cubic spline interpolation is applied to calculate the horizontal wells, the borehole trajectory of the reach wells. Using this method, as calculating the trajectory of horizontal wells between any two adjacent known points, the interpolation point can be increased unlimitedly and easily, so angle and azimuth of the horizontal wells are easily calculated at any depth at well. in order to determine the spatial location of the well trajectory, to establish the three-dimensional Cartesian coordinates, namely geographic coordinate system, method of Simpson numerical integration is used on each node of the borehole to get integral geographical coordinates, three drawing software are used to get the three-dimensional space of the well trajectory curve. Curvature of the borehole is a very important parameter to understand the formation deflecting characteristics, measurement tools for deflecting and evaluation on the quality of the casing. As for curvature of the borehole of differential curvature at depth the use of the borehole geometry derived from the mathematical formula. Combining the underground geometric relations on the basis of calculation of wellbore trajectory curvature radius, horizontal well casing downhole tool string through the boundaries is analyzed and calculated.The rod string is the most important in oil and gas drilling and production engineering tools to go down. Rod column of the oil and gas work well within the narrow wellbore fluid, pressed by various forces, it is in a very complex stress and deformation state of motion. this paper makes analysis on the force of the horizontal well string, establishes of the soft-pole model of the horizontal well in testing string, obtains the frictional resistance of the column in different wells, and draw out the string to mention the decentralization process hook load, lay the foundation for the horizontal well development and repair construction operations that should be carried out smoothly. After getting the column axial force of column axial stress, finally the axial deformation of the down holes string is calculated.Body of horizontal wells of the structure is special, the formation sand must be recovered into the well bore, and the sand bed is formed in the shaft at the bottom, the formation may be serious sand,even the hole is blocked, operation of sand washing should be done to restore wells normal operation. The paper analyzes and calculates speed of sedimentation in a variety of flow pattern and ultimately gets the speed of sedimentation of spherical particles in the vertical wellbore. If the solid particles are of high concentration, the concentration of particles will inevitably lead to the impact of the calculation of settling velocity formula for calculating the terminal velocity, which needs considering speed of the particle concentration. This paper calculates and analyzes interference settlement of sedimentation speed. Critical horizontal wellbore sand carries speed calculation model of the lowest level, bring rock fracturing propend speed calculation, coils tubing drilling horizontal wells the minimum suspension velocity of two. The paper combines the relative mature vertical wellbore settling velocity, determines the critical horizontal wellbore sand, carries speed computational model. This paper also calculates the minimum suspension velocity, and works out the minimum pump displacement and determines the reasonable washed sand displacement.VB language is an object-oriented programming language evolving and developing from C language. Object-oriented programming design data combines method of operation of the data package with as an interdependent, indivisible whole object. The Microsoft Visual of Ba sic6.0development environments is applied to work out the preparation of work over operations in horizontal wells column software. The software consists of three main calculation modules. a module is the borehole calculation module. The second module is the calculation module of mechanical analysis. The third module is called horizontal wells washing sand wells calculation module. Horizontal wells column work over software calculation of the well trajectory calculations, the column friction calculation and horizontal wells washed sand wells together, which for the calculation of the future in these areas provides a good computing tool.