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Corrosion resistant casing, arrangement scheme and application

A technology of anti-corrosion casing and layout scheme, which is applied in the direction of casing, drill pipe, earthwork drilling, etc., and can solve problems such as service life of invalid anodes, crevice corrosion anodes, and anode materials that cannot be seamlessly connected, so as to prolong the service life, Effect of reducing uneven corrosion

Pending Publication Date: 2018-01-12
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problems that the traditional anode material precast according to the outer diameter of the casing cannot be tightly and seamlessly connected with the outer wall of the casing, and the crevice corrosion causes anode failure and short service life of the anode

Method used

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  • Corrosion resistant casing, arrangement scheme and application
  • Corrosion resistant casing, arrangement scheme and application
  • Corrosion resistant casing, arrangement scheme and application

Examples

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Effect test

Embodiment 1

[0018] In order to solve the problems that the traditional anode material pre-cast according to the outer diameter of the casing cannot be tightly and seamlessly connected with the outer wall of the casing, the crevice corrosion causes anode failure and the anode has a short service life. figure 1 The anti-corrosion casing shown includes a casing 1, and a melted zinc anode 2 is cast on the outer surface of the casing 1, and the length of the zinc anode 2 along the axial direction is 500 mm.

[0019] The working principle of the anti-corrosion casing provided in this embodiment is:

[0020] After the zinc anode 2 is melted, it is directly cast on the outer surface of the sleeve 1 to make the anti-corrosion sleeve. The zinc anode 2 and the casing 1 are seamlessly and tightly conductively connected, and the zinc anode 2 provides a stable and continuous protection current, which effectively reduces the anode failure caused by uneven corrosion and crevice corrosion of the anode mat...

Embodiment 2

[0022] On the basis of Example 1, the zinc anode 2 is axially distributed at the front, middle and rear ends of the casing 1, the zinc anode 2 at the front end is 1000 mm away from the thread at the end of the casing 1, and the zinc anode at the rear end is Anode 2 is 1000mm away from casing 1 end collar.

[0023] Zinc anodes 2 are distributed at the front, middle and rear ends of the casing 1, and the front and rear are 1000mm away from the thread and the coupling respectively, so as to ensure that the hydraulic pipe wrench, elevators, clamps, etc. The normal use of tools such as tiles.

Embodiment 3

[0025] On the basis of Example 2, the outer diameter of the zinc anode 2 is 0.3 mm to 0.5 mm larger than the outer diameter of the collar of the casing 1 .

[0026] The outer diameter of the zinc anode 2 is close to the outer diameter of the collar of the casing 1. During the running of the anti-corrosion casing, the well wall does not wear the surface of the anode, ensuring the normal running of the anti-corrosion casing.

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Abstract

The invention provides a corrosion resistant casing, an arrangement scheme and application. The corrosion resistant casing comprises a casing body. Melted zinc anodes are cast on the outer surface ofthe casing body, and the length of each zinc anode in the axial direction is 500 mm. The zinc anodes are distributed at the front end, the middle end and the rear end of the casing body in the axial direction. The distance between the zinc anode at the front end and a thread at the end of the casing body is 1000 mm, and the distance between the zinc anode at the rear end and a coupling at the endof the casing body is 1000 mm. The two corrosion resistant casings and common casings are connected at intervals to form a casing pipe string, and every 1-4 common casings are connected between the two corresponding adjacent corrosion resistant casings in series. According to the corrosion resistant casing, the arrangement scheme and the application, after being melted, the zinc anodes are directly cast on the outer surface of the casing body, and thus the corrosion resistant casing is prepared; and the zinc anodes and the casing body are connected seamlessly, closely and conductively, the anodes provide stable and continuous protective currents, the anode invalidation phenomenon caused by uneven corrosion of anode materials and seam corrosion is effectively reduced, and the service life of the anodes is significantly prolonged.

Description

technical field [0001] The invention belongs to the technical field of oil and gas field corrosion and protection, and in particular relates to an anti-corrosion casing and its layout scheme and application. Background technique [0002] In the process of oilfield development, the casing has been eroded by formation water for a long time. Due to the corrosion factors such as high salinity, hydrogen sulfide, dissolved oxygen, carbon dioxide, and sulfate-reducing bacteria in formation water, the casing will be damaged under temperature, pressure, flow rate and alternating stress. Under the combined action of other factors, the outer wall of the casing will be severely corroded. Cathodic protection is an effective protection method to prevent pipe corrosion. There are many patents on this technology at home and abroad, but there are generally few conductive connection points, easy to fall off, and easy to fail. [0003] For example (1) the utility model patent CN202989282 U is...

Claims

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Application Information

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IPC IPC(8): E21B17/00C23F13/16
Inventor 陈在君张新发陈小荣郭亮吴保玉张军峰曲先伟狄强
Owner BC P INC CHINA NAT PETROLEUM CORP
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