How does super long oil well pump protect barrel from abrasion？
In the process of extracting oil from the stratum, mechanical equipment is used to lift the crude oil in the well to the ground, and the sucker rod pump is the main oil extraction equipment. The sucker rod pump is a special form of reciprocating pump. The power is transmitted from the ground to the downhole through the sucker rod, so that the plunger of the sucker rod pump moves up and down to lift the crude oil in the sucker rod along the tubing to the ground.
Many wells in an onshore field were facing the acute problem of general corrosion, pitting and rod-tubing-pump wear, Among them, the wear of the oil well pump is the most common.
Analysis of barrel failure of SRP wells with respect to uniform corrosion, pitting and mechanical abrasion has been carried out. The primary objective includes the identification of root cause of failure and suggesting alternate metallurgy.
In order to achieve a long stroke, the sucker rod pump in the prior art needs to be connected with 5 or more pump barrels of 10 meters or more, and the length of the plunger sealing surface is 1.5 meters or more. During use, due to the short length of the plunger, the plunger is in contact and wear with the pump barrel throughout the entire process, while the pump barrel is longer and intermittently in contact with the plunger. The pump barrel of the sucker rod pump generally uses a chrome-plated pump barrel, which has High hardness and wear resistance, and the plunger of the sucker rod pump is generally spray-welded plunger, which has low hardness and is not wear-resistant compared to the pump barrel plunger; it can be seen that the pump barrel is The most valuable part of all parts of the sucker rod pump, and the plunger is of lower value.
However, when the plunger wears out, there will be premature damage to the plunger due to wear. At this time, the pump barrel is in a situation where it can continue to be used. However, the damage of the plunger will cause the entire oil pump to be scrapped. Therefore, the existing The technical sucker rod pump has the situation of wasting the pump barrel, resulting in the problem of incomplete use of the sucker rod pump and high cost.
The purpose of this design is to provide a wear-resistant ultra-long sucker rod pump to alleviate the technical problems of waste pump barrels, incomplete use of sucker rod pumps and high cost in the prior art.
This design includes a plunger device and a pump barrel device; the plunger device is located in the pumping passage of the pump barrel device, and the plunger device is used to move along the pumping passage of the pump barrel device to use the movement of the plunger device to move the sucker rod The crude oil in the medium is lifted to the ground along the oil pipe; among them, the pump barrel device includes a pump barrel and an oil pipe;
there are at least two pump barrels, and any two pump barrels are connected by an oil pipe, and between the plunger device and the pump barrel Sealed fit; the length of any pump barrel is less than the length of the plunger device, the length of the tubing is less than the length of the plunger device, and the inner diameter of the tubing is greater than the outer diameter of the plunger device, so that when the plunger device moves to the tubing position, the column There is a gap between the plug device and the tubing;
the plunger device and the pump barrel move through a sealed fit, that is, the movement between the plunger and the pump barrel will cause abrasion, but because there is no wear between the tubing and the plunger device And because the length of the plunger device is longer than the length of the pump barrel, and the length of the tubing is less than the length of the plunger device, during use, the plunger device can contact and wear the pump barrel for a long time.
The indirect setting can contact and wear with the plunger device in a short and intermittent manner. It is proved by actual use that the sucker rod pump provided by the present invention can meet the wear cycle of the plunger device and the pump barrel more evenly. The service life of the two is equivalent.
The plug device prolongs the sealing surface, makes the service life of the sucker rod pump longer, and alleviates the technical problems of waste pump barrels in the prior art, incomplete use of sucker rod pumps and high cost; as multiple barrels can be used, it can be realized Any stroke can be used for oil extraction, so as to realize ultra-long stroke oil extraction.