CN100494490C

CN100494490C - Technology for solving hydrogen sulphide corrosion of pipe drilling tool and pump during oil gas exploitation

Info

Publication number: CN100494490C
Application number: CNB2006101691657A
Authority: CN
Inventors: 李天忠
Original assignee: Individual
Current assignee: Individual
Priority date: 2006-12-18
Filing date: 2006-12-18
Publication date: 2009-06-03
Anticipated expiration: 2026-12-18
Also published as: CN101012557A

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 aThe 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. nd 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

Solve hydrogen sulfide corrodes pipe bit tool, pump in oil-gas mining a kind of technical matters

Technical field:

The invention belongs to exploitation of oil-gas field, equipment is manufactured Application Areas, relate to a kind of in oil-gas mining hydrogen sulfide to the corrosion of pipe bit tool, pump, be specially a kind of hydrogen sulfide corrosion resistance can alloy electroplating bath and process for treating surface technology.

Background technology:

Hydrogen sulfide (H ₂S) be a kind of colourless gas, have smell of putrid egg.Molecular weight is 34.08; Relative density 1.1906; Soluble in water, be soluble in methyl alcohol class, petroleum solvent and the crude oil, in oil-gas mining with CO ₂And O ₂Compare, the solubleness of hydrogen sulfide in water is the highest, but also is a kind of very strong hydrogen medium that oozes, in the corrosive medium of numerous compositions, show steel are had very strong corrosion failure, and be corrosive gases main in the oil and gas industry.It is acid that the in a single day water-soluble just ionization immediately of hydrogen sulfide is, and the metal equipment facility corrosion failure on the sulfide hydrogen sour oil gas field is particularly serious, and two big classes are typically arranged: a class is general corrosion or the local corrosion that the anode dissolved ferric iron causes in the electrochemical reaction process; Another kind of is the hydrogen atom that negative electrode is separated out in the electrochemical reaction process, cause steel in hydrogen-sulfide environmental, to ftracture, this comprising: hydrogen blistering (HB), hydrogen bring out crackle (HIC) and stress guide is brought out crackle (SOHIC), sulfide stress cracking (SSC) (SSC) etc. to hydrogen.The pipe bit tool that uses in the oil gas well, pump are under dynamic environment, be subjected to that the interaction of mechanical force and waterpower and oil gas are pressed, galvanic corrosion or polytype corrosion easily take place in the variation of the temperature difference, in causing the numerous factors of sour oil gas field equipment facility corrosive, hydrogen sulfide is the most dangerous, it not only can cause the paroxysmal sulfide stress cracking (SSC) of metallic substance, cause the tremendous economic loss, and the poisonous gas of hydrogen sulfide is also threatening personnel safety.The gas blowout accident takes place in gas ore deposit, northeast, river, Kai Xian, Chongqing on the 23rd December in 2003, hydrogen sulfide containing gas is gushed from the drilling tool hydrophthalmia, toxic gas out of control is with the air bamboo telegraph, cause occurrence of large-area disaster at short notice, current gas ore deposit, northeast, river Sweet natural gas " blowout " accident, diffusion because a large amount of hydrogen sulfide is gushed, dead people more than 200 in the incident, cause the people's lives and properties massive losses, the seriousness of accident causes that the Party Central Committee, State Council pay much attention to, and are subjected to social extensive concern.

The oil-gas field that builds up in the China's oil Natural gas extraction belongs to the sour oil gas field mostly, the branch zone is more extensive, as: Sichuan oil-gas field, North China oil-gas field, Bohai Bay oil-gas field, East Sea oil-gas field, Xinjiang Oil Regions gas field, Shandong Shengli Oil Field, Tianjin Dagang Oilfield, Henan Oil Field, long celebrating oil field, Liaohe Oil Field, Zhongyuan Oil Field, Jianghan Oil-field etc.Because it is bigger to pipe bit tool, pump destruction dynamics that hydrogen sulfide belongs to the high strength corrosion, thereby, be to shorten in specific equipment, the facility cycle in work-ing life that exploitation or oil gas output all will make input in oil-gas mining, task difficulty increases; The exploitation of single port oil gas well or exploitation input cost expense height, (Sichuan oil-gas field, the investment cost of single port oil gas well are mostly all at up to ten million yuans, and part oil gas well investment cost is up to arriving more than one hundred million units.) produce little effect, have to lie over and wait to develop.

After entering 2006, the domestic major oil gas-field exploitation duration is all more than 30 years, the lasting exploitation in oil field, the hole condition condition constantly worsens, especially in the middle and later periods, oil well, oil gas skip-cage combination shaft recovery ratio difficulty increase, in order to stabilize and increase oil offtake, oil well re-injection water is inevitably, contains H in various degree in the regional oil gas well that recovers the oil ₂S, CO ₂, sulfur-bearing, containing the oil gas well composition complexity of high salinity, various dedicated pipe drilling tool pumps, oil pipe and the sleeve pipe etc. of use all are in this severe environment.The oil well corrosion, oil pipe and telescopic internal corrosion are particularly serious, more particularly continue exploitation maturing field for many years, pipe is scrapped directly and is accounted for more than 60% owing to the corrosive ratio, stops production because of corrosion causes oil well in the high oil-gas bearing area of part; The disconnected pipe bit tool that falls within the well is salvaged difficulty, can cause oil well to scrap when serious or causes the substantial pollution serious accident.

The market study reflection: hydrogen sulfide does not also have ripe effective solution at present to the corrosion of pipe bit tool, pump in the domestic petroleum Natural gas extraction industry; Reduce the measure of erosion rate in the exploitation exploitation and adopt interpolation adsorptive type, composite inhibiter mostly, dehydration, interior protection preservative coat and lining wait the corrosion of alleviating this medium.

Summary of the invention:

The invention provides a kind of electroplate liquid formulation, and in conjunction with unique supporting technical matters, carry out surface Hardening Treatment on the sour oil gas field, being used for equipment facilities such as pipe bit tool that metallic substance makes, pump, the surface that the thick alloy layer of 25 μ m acts on these workpiece can make its surface porosity factor reduce to zero, the corrosion failure that has solved metal works surface pitting, pitting, erosion and caused makes the anti-H 2 S deep-etching in the oil gas well of these products; Utilize technical matters adjustment control workpiece hardness, workpiece is eliminated or the reduction internal stress, and the prevention metallic substance produces hydrogen embrittlement (HE) in the down-hole, stress guide is brought out crackle (SOHIC) and sulfide stress cracking (SSC) (SSC) phenomenon to hydrogen.

Carbon steel and low alloy steel occupy bigger proportion in the oil-gas field market development; Dedicated pipe drilling tool, the diversification of pump series, with the oil pipe is example, international API Spec 5CT and API 6A standard code, oil pipe uses will come the different tubing matter of selection intensity rank according to conditions such as oil well depth, oil-air pressures, for shallow well or inferior shallow well, generally select J-55 or N-80 low strength rank material for use, and, then select C-95, P-110, Q-125 etc. for use for deep-well, middle-deep well and ultra deep well; That is to say that the intensity rank of oil pipe, performance dispose rigorous in the use, can not be random, mechanical property malleable not when additional anti-corrosion measure itself.

Use anticorrosive intensive treatment technology,, guarantee that simultaneously it is vital that oil pipe original material internal organizational structure or mechanical property are not damaged satisfying or reaching under the prerequisite of Corrosion Protection requirement.

Prior art in the protection against corrosion Application Areas because factor such as treatment process temperature height, oil pipe material hardness is greatly improved, changed crude oil tubing matter mechanical property, the consequence that causes: fragility produces excessive, yielding, can not bear big contact stress and high shock load, its negative effect has been aggravated the corrosion failure dynamics of hydrogen sulfide to tubing matter, and the oil gas well that is used for the sulfide hydrogen composition cracks or ruptures is inevitable.

Enforcement of the present invention is core with bath element, performance; Bonding force with alloy layer and workpiece substrate is guarantee; With control, the hardness parameter of assurance workpiece in the whole technique treatment process is benchmark; To handle the enforcement temperature low serves as basic; Thereby form hydrogen sulfide corrosion resistant and make up four key elements.

Alloy electroplating bath provided by the invention is that to be with pure water that main medium is aided with other multiple material formulated.Wherein plating bath consists of: pure water: tin protochloride: single nickel salt: inferior sodium phosphate: boric acid: soluble saccharin: lead ion=90:3:3:2:1.9:0.3:0.02, treatment process be, plating bath is heated 50～80 ℃, determines plating time according to desired thickness.

Tangible beneficial effect: can save to mining operations a bite oil gas well: pipe bit tool material pump, tooling cost expense, transport charge, construction operation removes upkeep cost, various large-scale support equipments utilize expense, the materials consumption expense, the operation cost of manually turning out for work, oil gas well servicing construction stopping production financial loss; Estimate all can rise in value in saving last year of existing basis and extra earning more than 20%.

Enforcement of the present invention can descend 30% with the investment cost of single port oil gas well, has realized low input, low consumption, high-level efficiency.A whole set of treatment technology technical process, energy-conservation, consumption reduction, pollution-free.

The present invention seeks in exploitation of oil-gas field, to increase substantially the work-ing life of the recovery ratio of oil gas well and pipe bit tool, pump, reduce task difficulty, reduce replacing, frequency of maintenance, the control Pollution risk is stopped industrial accident that causes because of hydrogen sulfide corrosion or the personal injury that causes to greatest extent.

Embodiment:

The present invention is achieved in that pure water, tin protochloride, single nickel salt, inferior sodium phosphate, boric acid, soluble saccharin etc. is weighed in proportion that the molten device of putting into belt stirrer stirs, and treats all just can use after the dissolving.When needing plating plating bath is heated 50～80 ℃, determine plating time according to desired thickness.Material wherein is pure water: tin protochloride: single nickel salt: inferior sodium phosphate: boric acid: soluble saccharin: lead ion=90:3:3:2:1.9:0.3:0.02.

The technical matters step:

1, early pre-treatment process; Metal works is carried out the modifier treatment reduction earlier or eliminates internal stress before plating, then workpiece is carried out oil removing, rust cleaning, with methods such as mechanical sandblastings deburring, zone of oxidation, crud layer are removed in its surface, clean, dry, reach workpiece substrate surfacing, smooth, cleaning.

2, plating treatment process; The alloy electroplating bath for preparing is in advance poured in the plating groove of getting ready, when needing plating plating bath is heated 50～80 ℃, determine plating time according to desired thickness.

3, plating aftertreatment technology; In conjunction with workpiece material, service requirements, alloy layer thickness, the workpiece product that plating is good carries out the plating aftertreatment to utilize loft drier, and its temperature, time can effectively be controlled and hold the hardness value that workpiece obtained.

Adopt above treatment process and technology, it is low to consume energy, and workpiece product surface thickness of coating is even, bonding force is strong, corrosion weight loss is little, be bright shape; The technical matters stable performance is eliminated and has been reduced the product internal stress, and hardness is moderate, can not change workpiece product original material internal organizational structure or mechanical property, the anti-H 2 S deep-etching.

Claims

1, solves hydrogen sulfide corrodes pipe bit tool, pump in oil-gas mining a kind of technical matters, comprise the alloy electroplating bath and the process for treating surface technology of hydrogen sulfide corrosion resistance energy; It is characterized in that described plating bath consists of: pure water: tin protochloride: single nickel salt: inferior sodium phosphate: boric acid: soluble saccharin: lead ion=90:3:3:2:1.9:0.3:0.02.