Composite rods made of fiberglass are a promising way to increase the efficiency of well operation by rod installations, which are characterized by significantly lower weight, higher strength and corrosion resistance compared to steel rods. Due to the difference in the physical properties of the material of steel and fiberglass pumping rods, the calculation of the optimal operating mode of rod installations requires individual design of the process mode parameters for each specific well.
Experimental field tests were performed to optimize the technological mode of rod installations with a combined fiberglass rod column on the basis of multivariate calculations based on the developed mathematical model of a rod installation with a combined fiberglass rod column. Verification of the developed method for calculating the parameters of the technological mode based on the mathematical model of the rod installation showed a good agreement between the calculated and actual indicators. Based on the results of the field tests, additional liquid and oil production was obtained from the tested wells by increasing the depth of the pump descent and pumping speed. It is shown that the increase in the depth of the pump descent when optimizing the mode is mainly carried out by increasing the length of the fiberglass stage, so there is no significant increase in the load on the rod column. Due to the increased extensibility of fiberglass rods, which cause loss of plunger stroke, wells are optimized to switch to a smaller pump plunger diameter, which simultaneously reduces the maximum load on the rods and the drive. The results obtained are recommended to be taken into account when designing the technological mode of rod installations equipped with fiberglass rods.
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