Protective techniques for the most flaming plunger

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Protection skills of plunger pump most domestic oilfields have entered the high water cut development period, and conventional plunger pump is one of the main oil production methods. Due to the influence of factors such as high sand content, high water content, high salinity, high temperature steam heavy oil production, polymer injection production and strong corrosive medium environment, the average pump inspection cycle of plunger pump wells is becoming shorter and shorter, and some pump inspection is even required in less than 30 days, which seriously affects oilfield development, he said for example. According to the failure causes of the plunger pump, such as oil well water outflow, sand production, injection of easily corrosive and scaling injectables, high salinity, bottom hole temperature, high corrosion degree of liquid medium, inadaptability of well structure and plunger pump structure, surface treatment of plunger and pump barrel and surface materials that can not meet the requirements, there are also a variety of protection methods for the plunger pump, There are mainly the following:

changes in pump structure

in sand producing oil wells, the conventional plunger pump often has sand stuck plunger, sand buried sucker rod, sand grinding pump barrel and plunger, which makes the oil well pump premature failure. To solve these problems, the pump R & D personnel designed a long plunger short barrel anti sand pump. In the production process, a part of the plunger is always exposed in the pump barrel, so it is not easy for the sand to enter the gap between the pump barrel and the plunger, which can avoid the occurrence of sand jam or sand burying plunger accidents after stopping pumping, and effectively extend the maintenance free period of the oil well. Some pumps also add some auxiliary components, such as upper and lower sand scraping cups, functional joints, etc., to further prevent the deposition of sand between the pump barrels.

the rotary plunger pump can make the plunger rotate randomly in each stroke, constantly change the contact surface between the plunger and the pump barrel, gradually and evenly wear the plunger circumference, and discharge the sand particles from the plunger and the pump barrel at the same time, It solves the serious positioning wear and rod column tripping caused by the accumulation of abrasive materials

in order to achieve sand control effect, non clearance seal oil well pump and piston oil well pump are also developed

qb/t 1048 (2) 004 compression testing machine for paperboard and carton, gb/t 15234 (1) 994 plastic flat pallet, gb/t 4996 (1) 996 test method for intermodal flat pallet, gb/t 27915 (2) 011 test method for combined plastic pallet, gb/t 4996 (1) 985 test method for wooden intermodal flat pallet and other standards require that improving the groove shape and position on the plunger can also play a certain role in sand discharge and sand control

according to the statistical data, the failure of the upper valve cover of the plunger oil well pump is prominent, and its failure form is mainly fracture. There are two parts: one is the oil outlet of the upper valve cover; The first is the thread root at the connection between the pull rod and the upper valve cover. For this reason, the anti break upper valve cover is specially designed and developed to prevent the upper valve cover from breaking when the oil well pump is working

in order to prevent leakage between the valve ball and the valve seat, some pumps are also designed with multiple movable and fixed valves

"vacuum" chamber type double plunger oil well pump is used to extract viscous oil and stable viscous oil-water emulsion. It uses the "vacuum" chamber to cause downward force on the sucker rod string and plunger when the pumping unit strokes down, so as to make them produce downward forced movement. The diaphragm oil well pump is used to mine crude oil containing abrasive particles (such as sand and mechanical impurities) and corrosive media. It uses the diaphragm to protect the working elements of the oil well pump that support the establishment of an authoritative, open and shared new material database, prevent contact with the formation liquid containing sand, salt and corrosive media, and prolong the service life of the oil well pump

improvement of pump material and surface treatment

generally, the bushing material is 20CrMo carburizing or 38crmoa nitriding. There are also 45 steel plated with chromium. The plunger is plated with carbon steel. This matching pair is not suitable for the medium environment with high sand content and high salinity. According to the investigation and analysis of the failed wells, the protective layer of the matching pair is easy to be damaged by the abrasion of high hardness quartz sand, and then serious electrochemical corrosion occurs, causing the protective layer to fall off, and even a pump sticking accident. According to the actual situation of the current oil field, the plunger coated with nickel base spray welding alloy has been widely used, which can partially solve the above problems, but the effect is still not very good for wells with serious sand production or scaling. With the improvement of surface treatment technology and material processing technology, new materials and surface treatment technology of plunger and pump barrel will be introduced continuously. At this time, it is particularly important to pay attention to the optimization and matching of the materials of plunger and pump barrel. The ceramic special pump to be launched by antonol Engineering Technology Co., Ltd. will greatly improve the performance of plunger oil well pump in terms of sand prevention, scale prevention, wear resistance and high temperature resistance

most valves and valve seats are made of 3Cr13, and a few are 6cr18mo and 9Cr18Mo. From the field application, the poor hardness, wear resistance and corrosion resistance are the main reasons for the stabbing and failure of the fixed valve. Some oilfields use tungsten carbide valve seat to replace the original 6Cr18M, but it should be noted that the increase of valve ball density will increase the resistance of oil flowing into the pump and the pressure drop at the fixed valve. There are also ceramic valve balls and ceramic valve seats. Sometimes ceramic valves may crack, which should also be paid attention to in use

structural change of pump related string

by using ultra-high strength sucker rod string and configuring a certain weight of weighting rod at the bottom of the rod string, the bending of the pump barrel can be prevented and the wear of the plunger and pump barrel can be reduced

processing and manufacturing process

due to the differences in the processing, material handling, assembly and other links of the pump barrel plunger, various parameters of the pump with the same specification cannot be completely consistent, which will cause a variety of unexpected accidents. Quality monitoring should be strengthened in the processing process

other measures

such as parameter matching with long stroke and low stroke; Selecting oil wells with sufficient liquid supply capacity and keeping the same pump efficiency, the submergence of large pumps should be slightly greater than that of small pumps can also prolong the service life of pumps to a certain extent

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