Inclined well pumping unit, rod, pump analysis

Inclined well pumping system and vertical well pumping system, in a broad sense, should include the reservoir, wellbore flow, pumping unit, sucker rod and pumping pump hereinafter referred to as the machine, rod, pump, the surface of the oil pipeline and oil separator . Because inclined shaft, directional well and horizontal well are collectively referred to as the special shaft structure below the inclined shaft, the working environment of the pump and the operation of the pump are much more complicated than the straight shaft. Therefore, it is of great importance to carry out the optimal design of inclined rod pump production system. In this paper, the method of system engineering analysis is used to establish the optimal design method of inclined well pumping system. The contents include designing and coordinating the supply and discharge of oil well, choosing the reasonable working parameters of machine-one pump, Predict the conditions of its indicators, so that the entire underground system to work efficiently and safely. Curvature of the pole unit, - Length of the pole unit. Three-dimensional wellbore rod unit technology principle Three-dimensional wellbore shaft in the axial and lateral load calculation mathematical model 'In order to establish a common model of axial load calculation of three-dimensional boreholes, first consider the trajectory between two wellbore measuring points A pole unit is shown in the figure to establish the relationship between axial load and other factors. Reasonable spacing of the centralizer Calculating the wellbore profile of a deviated well has different doglegs in different curved sections. It is important to have several centralizers in each section. In the pump displacement to meet the production requirements at the same time, select the appropriate pump efficiency, downhole efficiency range corresponding pumping parameters combination as a candidate results, the comprehensive evaluation of the candidate program to produce the best solution can be used to rational selection of pumping equipment models, Optimized lifting design. In order to accurately draw the pump discharge dynamic curve, we must calculate the mathematical model of the rod axial and lateral loads in the three-dimensional wellbore as described above to simulate the lifting dynamics of the rod pump, that is, Equal stress range design and accurate calculation of pump efficiency. Generate coordination points for supply and discharge. The two curves are superimposed together to form a "supply and discharge coordination map" of the well. Only in the supply and discharge coordination point, well supply and drainage conditions can achieve a coordinated, access to the largest oil well lift production. Calculate the conditions of each stage of the oil well indicators. Taking fully into account the viscosity and temperature characteristics of crude oil and the change of the viscosity of the crude oil mixture on the rod friction, the calculation of the rod load, maximum torque, stroke efficiency, pump efficiency, hydraulic power, polished rod power, Underground system efficiency. Program optimization design. To yield, pump efficiency, downhole efficiency for the overall goal of the candidates for the comprehensive evaluation of the program to optimize an optimal program. At the same time, the program of the pole combination, emphasis bar, centralizer position redesign and verification, calculation of its working conditions indicators. As a result, it can be used to guide the selection of machines, rods, pumps and pumping parameters for inclined pumping systems. Conclusion The application example of the application of the preparation of inclined shaft sucker rod pump oil production system optimization design software, the Shizizou oil field inclined shaft sucker rod pump oil pumping production system optimization design, have achieved a more satisfactory results. Shizhi inclined shaft optimization design pumping parameters and column optimization results are shown in the table. Optimization results of inclined shaft pumping parameters in table lions The trajectory of inclined shaft wells is a three-dimensional space curve, and the stress of inclined shaft sucker rods is quite different from that of conventional vertical wells. For this reason, the conventional sucker rod column design method must be adjusted to accommodate the inclined shaft sucker rod pump production conditions. From the force calculation of sucker rod micro-section, the load calculation method of the whole column and the design method of pumping parameters of pumping system were studied, and the software of inclined shaft design was compiled. The field application of the inclined shaft shows that according to the result of the software optimization design, the pumping unit, pump diameter, pump depth, the combination of the rod and column, the length of the weighted rod and the spacing of the centralizer can be reasonably selected, so as to effectively reduce the eccentric wear of the rod and reduce Point-hanging load, increase productivity, pump efficiency and downhole system efficiency.