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External corrosion proof technology of oil field oil water well annular tube

A technology for oil-water wells and casings, which is applied in the field of anti-corrosion technology for oil-water well casings in oil fields. It can solve the problems of liquid epoxy coal tar pitch anti-corrosion layer insulation performance, low mechanical properties, restrictions on industrialization, and high cost of aluminum anodes. Bare metal area, improved anti-corrosion reliability, high effect of anti-corrosion reliability

Inactive Publication Date: 2006-06-14
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Simultaneously, the technological prototype of the present invention is, the casing bracelet type aluminum sacrificial anode of test in 1993 adds the external anti-corrosion process of epoxy coal tar pitch coating, once in " petroleum drilling technology " 1996 (volume 18) the 2nd phase P43 ~P45 was published publicly, but this technology exists: 1. The cost of the aluminum anode used is high; 2. The insulation and mechanical properties of the liquid epoxy coal tar pitch anti-corrosion layer are relatively low
Aluminum anode leads to high investment per well (80,000 to 90,000 yuan / well), so industrialization is greatly restricted

Method used

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  • External corrosion proof technology of oil field oil water well annular tube
  • External corrosion proof technology of oil field oil water well annular tube
  • External corrosion proof technology of oil field oil water well annular tube

Examples

Experimental program
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Effect test

Embodiment 1

[0032] According to the well depth of Changqing Xifeng Oilfield, the present invention designs an epoxy cold-wrapped zinc anode casing anticorrosion process scheme that meets the anticorrosion requirements of this area. In 2003, 315 wells were popularized and applied in Changqing Xifeng Oilfield. The specific implementation plan includes the following 7 steps:

[0033] Al

Cd

Fe

Cu

Pb

Si

Zn

0.55

0.072

0.0023

0.005

0.0044

＜0.01

margin

[0034] 2. Casing inspection: For the casings that have passed the oilfield quality inspection, check the pipes one by one for deformation, bending, pits, micropores and other defects on the surface before anti-corrosion construction. Defective pipes must not be used.

[0035] 3. Casing epoxy cold wrapping construction: first reserve 500mm from the end face of the casing female coupling and pin to the pipe body without winding, as hoisting and tong construction, and...

Embodiment 2

[0043] The prototype of this technology was tested in 1993 in the casing bracelet type aluminum sacrificial anode plus epoxy coal tar pitch coating external anti-corrosion process. At that time, the anti-corrosion materials used were aluminum anode and epoxy coal pitch. With the progress of material technology, now The mechanical and corrosion resistance of the epoxy cold-wrapped anti-corrosion layer have been greatly improved, and the zinc anode is more suitable for the environment of the corrosive medium of the Luohe River in Changqing.

[0044] In July 1993, two wells (Xinhua 38-13: from the original Hua 38-13 well) were constructed in the Huachi and Lingnan operation areas of Changqing Oil Production No. Plane 4 meters, Xinnan 29-22 well: 10 meters away from the original Nan 29-22 well), these two wells are still in normal production for 10 years (design life 27-34 years). Compared with the original well and the renewal well, the Xinhua 38-13 well has exceeded the life of ...

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PUM

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Abstract

The invention relates to an oil field oil water well casing outer corrosion protection technique applied in epoxy cold taping and zinc anode. Its feature is adopting combining technique of using anticorrosion coating and epoxy cold taping to isolate casing outer corrosive medium and affording protecting current for the casing by sacrificed anode polarization. The anticorrosion coating includes epoxy coal pitch and epoxy cold taping. The sacrificed anode is zinc alloy. Each component weight percentages are that Fe 0.0023%, Cu 0.005%, Pb 0.0044%, Si less than 0.01%, Al 0.55%, Cd 0.072%, rest Zn. The standard is 168*142*500. The distributions are that each 100m is one group; each group has five branches, which is set on the casing by locking device. The technique is applied in oil field underground casing corrosion damage, solves the problem that impressed current cathode protection needs power supply.

Description

technical field [0001] The invention relates to an external anti-corrosion process for oil and water well casings in an oil field using an epoxy cold wrapping tape and a zinc anode. Background technique [0002] Aiming at the external corrosion of oil and water well casings in oil fields, there are currently three types of external casing anti-corrosion technologies adopted by oil fields at home and abroad: 1. Using 13Cr or more stainless steel alloy casings; 2. Implementing cathodic protection technology; 3. Using cement upward classification cementing technology. [0003] Among them: the corrosion resistance of stainless steel alloy casing above 13Cr is good, but the price is expensive, and it does not meet the low-cost development requirements of low-yield oil and water wells; the cathodic protection technology is mature and widely used at home and abroad. The main problem is that the protection effect depends on management and parameter control. The maintenance workload...

Claims

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Application Information

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IPC IPC(8): C23F15/00
Inventor 杨全安杨海恩王林平任建科程碧海李琼伟崔占江裴润有吴宗福
Owner PETROCHINA CO LTD
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