Look finally from angle of oil well pump, the choice of the material of pump canister and force plunger and finishing craft makes the payoff that decides this tribology system corrodes wear extent. The well that at present domestic oil field uses pump having lever is counted in order to hold very large proportion, it is oil well pump of force plunger type for the most part among them, oil well pump of groovy force plunger already made one of main oil extraction way.
Of the pump canister of force plunger oil well pump and force plunger wear away, corrode, cut is more and more serious, wildcat is average check pump cycle is shorter and shorter, some does not need check pump to 30 days even, because domestic oil field already entered tall hydrous development for the most part period, add Gao Han exploitation of stiff oil of steam of arenaceous, high temperature, note polymer exploitation and strong corroded medium environment is mixed the element influence such as well condition difference, affect what oil field develops economic integration benefit badly to rise. Domestic and international numerous orgnaization threw much power to study the invalidation reason of oil well pump and preventive measure. Among them the material that an effective method is canister of actor choosing pump and force plunger and finishing craft.
Pump canister and force plunger attrition deputy reach all round working environment and condition made system of a tribology, of this one system corrode wear extent to be decided by the corrodes wear extent and force plunger corrodes wear extent summation place of pump canister. And the element such as environment of concern of chemical function, mutual motion, work and condition decides the corrodes wear extent to become material by compose physics mechanism with pump canister and respective force plunger. The purpose that choose and optimizes pump canister and force plunger material and finishing craft is allow this tribology system corrode wear extent to achieve the smallest. Because influencing factor is numerous, so the material of pump canister and force plunger chooses to match still neither one theory is directive, the most work that personnel of research and development does at present is the material that chooses all sorts of pump canisters and force plunger and finishing craft, corroding certainly next wear away undertake indoor attrition wears away below the condition experiment, will be certainly below condition of this kind of experiment from the result of the experiment, should choose material of what kind of pump canister force plunger. Here introduces result of two kinds of tests: The first kind of result: Pump canister material and finishing craft are chemistry of 45 steel surface chromium of plating of surface of alloy of plating nickel phosphor, 303 steel, 4% - nitrogen of pressurization of 6% chromium steel is changed wait for 3 kinds; Force plunger material reachs a table and processing technology is processing of laser of steel of chromium of carbolic steel plating, carbon, naval brass chromium of plating of alloy of phosphor of chemical plating nickel, Meng Naier alloy 4 kinds. Part afore-mentioned material conjugate undertakes wearability experiments, the attrition that the experiment uses deputy mix by annulus a composition. Medium is clear water, temperature 60 ℃ , viscosity is 0.000653Pa/s. Experiment machine is MG - 200 model attrition of high speed high temperature wears away experiment machine. What add load 1kN, journey of test specimen total attrition is 20km. The conjugate wearability experiment of the data that passes pair of different pump canisters and force plunger and finishing craft studies, press force plunger first invalidation principle sort, can chafe for choosing pump canister and force plunger deputy best match material to be carbolic steel to learn alloy of plating nickel phosphor and chromium of carbolic steel plating respectively. The 2nd kind of result: Pump canister material and finishing craft are become apparent of steel of chromium of plating of carbolic steel surface, carbon to learn alloy of plating nickel phosphor and 38CrMoAl nitrogen to change; Force plunger material and finishing craft are become apparent of steel of chromium of plating of carbolic steel surface, carbon to learn solder of gush of surface of steel of alloy of plating nickel phosphor, carbon nickel radical alloy and 38CrMoAl nitrogen are changed, combine conjugate to chafe into 9 pairs respectively deputy. The experiment chafes deputy form by annulus and column. Experiment medium is oiliness sewage, among them oiliness 5% ; The mineral content in water: Chloric ionic 11000mg/1, carbon dioxide 25mg/1, calcic ionic 25mg/1, 30mg/1 of bicarbonate root ion, magnesian ionic 13mg/1, total iron 8mg/1; Contain arenaceous 0.4% ; Temperature is 60 ℃ . Use attrition of high temperature of homebred MG-200 high speed to wear away likewise experiment machine. Experiment load 100N, cheng of attrition head office is 6km about. Result of integration analysis test, think force plunger of solder of carbolic steel gush and conjugate of canister of chromic pump of carbolic steel plating are best, 38CrMoAI nitrogen changes force plunger and take second place of conjugate of canister of chromic pump of carbolic steel plating.
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