CN2837310Y - Corrosion inhibition device for pipe - Google Patents

Abstract

The utility model discloses a corrosion inhibition device for pipes, which comprises a short section, a corrosion inhibition layer and a coupling ring, wherein the corrosion inhibition layer is attached on the surface of the short section through electroplating; one end of the short section is machined with the coupling ring, and the other end is machined with a male buckle; the corrosion inhibition layer is metal or alloy and is used as an anode, wherein the potential of which is lower than that of a protected metal element; moreover, a corrosion inhibition battery is formed. The corrosion inhibition layer on the anode is continuous corroded, thus the exterior surface of the protected metal element is enriched with electron and a pipe bolt support under a well obtains effective protection. The utility model has the advantages of simple structure, convenient manufacture, low maintenance cost, once investment and long term revenue. The utility model can be used as an effective means for preventing the corrosion of pipe bolt supports under oil field well.

Description

A kind of pipe inhibition device

Technical field the utility model relates to a kind of pipe fittings of oil and water well oil pipe anti-corrosive.

Background technology oil pipe inhibition problem is the key issue of restriction oil and water well ordinary production.In the oil production process, owing to be subjected to chemical erosion for a long time from mud stratum liquid, thereby have a strong impact on work-ing life of drilling tool and oil pipe, all will change a large amount of pipes every year, if untimely replacing will cause the tubing string leakage, even oil pipe is threaded off, cause down-hole accident, thereby influence oil and water well production, cause the tremendous economic loss.Present existing oil pipe anti-corrosive protection has a kind of method, is exactly that the rail inwall is coated with and adds one deck anticorrosive or internal surface adopts thermal treatment anticorrosive.But the problem that this method exists is an oil pipe cost height, and transport condition requires high, and the screw thread place still easily is corroded, and can not fundamentally solve the tube corrosion problem, and the oil pipe well accident of threading off still frequently takes place.

The summary of the invention the purpose of this utility model provides a kind of pipe inhibition device.The utility model is achieved in that it is made up of pipe nipple, corrosion-inhibiting layer, box cupling three parts, and corrosion-inhibiting layer is attached to the outside surface of pipe nipple by electric plating method, and an end of pipe nipple is male joint, and the other end is a box cupling.Because of oil pipe several kms depths in well, be subjected to the corrosion of liquid in the well to produce negative ion and form negative electrode, tube corrosion is penetrated, the screw thread corrosion damage.The principle of pipe inhibition device is utilized electrochemical principle exactly, to need protected hardware as negative electrode, provide electronics by anode incessantly to negative electrode, at first make the member polarization, and then at component surface enrichment electronics, make it be difficult for producing ion, thereby the corrosion speed of having slowed down member widely; The oil pipe corrosion inhibition method is that the metal or alloy (as magnesium alloy, zinc alloy, aluminium alloy etc.) that utilizes current potential lower than protected hardware as anode, constitutes a corrosion cell.When negative electrode (protected structure) was protected, anode constantly was consumed, so claim sacrificial anode.It utilizes electrochemical method to work as anode at the metal of outside surface plating one deck relative reactivity of one section pipe according to the principle of galvanic protection, and the pipe pipe nipple is taken as negative electrode together with the oil pipe that links together, thereby reaches pipe roofbolt rot-resistant purpose.The beam hanger tubing string that the utility model can protect the down-hole to be soaked by the high salinity profit effectively, use cost is low, can realize the zero cost maintenance, once investment, long-term gain, the corrosion that can slow down downhole oil rod tube post effectively, the assurance oil well is exploited production for a long time.

Appended drawings 1 is a sectional view of the present utility model.Among the figure: the 1-box cupling; The 2-pipe nipple; The 3-corrosion-inhibiting layer.

Embodiment is with reference to accompanying drawing 1, and a kind of pipe inhibition device is made up of box cupling 1, pipe nipple 2 and corrosion-inhibiting layer 3.At outside surface plating one deck zinc of pipe nipple, two ends one end of pipe nipple is a box cupling, and the other end is a pin thread.Should clean out the impurity of inhibition device two end interfaces before installing; Oil pipe under pipe inhibition device and the pump is connected firmly; At least one of the every 50m of quantity (also can decide as the case may be) that installs; Decide according to concrete hole structure the position of installing; All to handle with care before and after installing, be damaged and influence use with the zinc layer of avoiding the inhibition device; Inspection corrosion situation is in time changed during operation.When whole oil pipe roofbolt was in the subterranean oil water layer liquid, the zinc on the corrosion-inhibiting layer will lose electronics, made whole oil pipe roofbolt surface enrichment electronics, and electrochemical reaction takes place, and the oil pipe roofbolt is effectively protected.

Claims (3)

1, a kind of pipe inhibition device, it comprises pipe nipple, box cupling, it is characterized in that the corrosion-inhibiting layer of electroplating surface at pipe nipple, and pipe nipple one end is processed with box cupling, and the other end is processed with pin thread.

2, a kind of pipe inhibition device according to claim 1 is characterized in that corrosion-inhibiting layer is a kind of than the low metal of protected metal current potential.

3, a kind of pipe inhibition device according to claim 2 is characterized in that corrosion-inhibiting layer is a metallic zinc.

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