Technology for solving hydrogen sulphide corrosion of pipe drilling tool and pump during oil gas dislodging

Abstract

The invention discloses an alloy plating liquid on the metal piece, which comprises the following parts: pure water, tin chloride, nickel sulphate, sodium hypophosphite, boric acid, saccharin sodium and lead ion with molar rate at 90:3:3:2:1.9:0.3:0.02, wherein the plating liquid is heat to 50-80 deg.c with plating time affirmed according to the needed thickness.

Description

Technical field: [0001] The invention belongs to the application fields of oil and gas field exploitation and equipment production and manufacturing, and relates to the corrosion of hydrogen sulfide on tubular drilling tools and pumps in oil and gas exploitation, specifically an alloy plating solution with anti-hydrogen sulfide corrosion performance and a surface treatment technology. Background technique: [0002] Hydrogen sulfide (H 2 S) is a colorless gas with an odor of rotten eggs. The molecular weight is 34.08; the relative density is 1.1906; it is easily soluble in water, methanol, petroleum solvent and crude oil, and it is compatible with CO in oil and gas exploitation 2 and O 2 In comparison, hydrogen sulfide has the highest solubility in water, and it is also a strong hydrogen permeable medium. It shows strong corrosion damage to steel in many corrosive media, and is the main corrosive gas in the oil and gas industry. . Once hydrogen sulfide dissolves in water,...

AI Technical Summary

Problems solved by technology

[0004] After entering 2006, the production period of major oil and gas fields in China has been more than 30 years. The continuous production of oil fields has deteriorating well conditions. Especially in the middle and late stages, the recovery rate of oil wells and oil-gas mixed wells has become more difficult. In order to stabilize and increase oil production The amount of oil well reinjection is inevitable, and the oil and gas wells in the oil production area contain different levels of H 2 S, CO 2 , oil and gas wells containing sulfur and high salinity are complex in composition, and the various special tubular drilling tool pumps, tubing and casing used are all in this harsh environment. Oil well corrosion, internal corrosion of tubing and casing is especially Seriously, especially in some old oil fields that have been continuously exploited for many years, the proportion of discarded pipes and tools directly attributable to corrosion accounts for more than 60%. In some areas with high oil and gas content, oil wells are shut down due to corrosion; it is difficult to salvage the pipes and drilling tools that have fallen into the well. , in severe cases, it will cause the oil well to be scrapped or lead to serious pollution and vicious accidents

[0005] Market research shows that there is no mature and effective solution to the corrosion of pipe drilling tools and pumps caused by hydrogen sulfide in the domestic oil and gas exploitation industry; most of the measures to reduce the corrosion rate in development and production are the addition of compound corrosion inhibitors, dehydration, and internal protection. Anti-corrosion layer lining, etc. to alleviate the corrosion of this medium