Research On Preventing Techniques Of Rod-tubing Eccentric Wear For Nearshore Rod Pumping Well In Liaohe Oilfield

With the oilfield development getting into the stage of pumping unit exploitation, thephenomenon of rod and tubing eccentric wear begins to appear and affect the oil production.In view of the rod and tubing eccentric wear problem, domestic and foreign oil workersresearch various anti-eccentric wear measures based on a lot of theoretical researches, andobtained a certain practical results. However, the research of rod and tubing eccentric wearmechanism is not enough and the well conditions is different, leads to the anti-eccentricmeasures discomfort. So the anti-eccentric wear measures failure phenomenon still exists.Therefore, it is necessary to develop the rod and tubing eccentric wear’s further research indifferent well conditions.Based on the understanding and mastering the mechanism of the rod and tubing eccentricwear, influencing factors and preventive measures in China and abroad, we studied deeply thetypes of damage to the wear, the forces and calculation method of rod string.On this basis, forbar beach area of Liaohe Oilfield’s rob and tubing wear problems, the factors such as holedebiation, production parameters, output liquid medium, and rod tubing material has beenanalyzed. We put forward to optimize the design of the centralizer and formed a complete setof eccentric wear combined with string and strengthen management to suit for the wearprevention measures in bar beach area of Liaohe Oilfield. Meanwhile, we optimized thesoftware design of the pumping system that is leaded by rod pump. The optimization designof pumping unit’s process has been realized. The specifically strategy of eccentric wearprevention has been formulated. The analysis of the field application shows that the resultscan satisfy the practical production requirements. It also has good economic benefit and it hascertain practical significance and promotion value.