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A production method of wear-resistant and anti-corrosion inner coating oil pipe

A production method and inner coating technology, which are used in anti-corrosion coatings, coatings, devices for coating liquid on surfaces, etc., can solve the problems of poor high temperature heat resistance, change the inner diameter of the oil pipe, and high friction coefficient, and achieve wear resistance and corrosion resistance. Good performance, extended tubing life, smooth surface

Active Publication Date: 2016-10-12
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] It can be seen from the comparison that the traditional inner coating mainly has defects such as high cost, long curing time, and low strength.
The improved inner coating uses polyethylene powder instead of nylon powder, which greatly reduces the cost; uses a mixed curing agent of dicyandiamide and sebacic acid dihydrazide, which significantly shortens the curing time and improves the tensile strength; but the method’s The disadvantage is that the high temperature heat resistance is poor, the thicker the coating changes the inner diameter of the oil pipe, and the friction coefficient is higher.
The integral protective layer has high strength, excellent wear resistance and corrosion resistance, good high temperature resistance, and good medium flow performance; but there are disadvantages such as high production cost, poor bending toughness, easy aging, and poor interface sealing.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Epoxy E 12 100 grams, 90 grams of cast stone powder, 3 grams of graphite, 10 grams of molybdenum disulfide micropowder, 20 grams of polyethylene powder, 3.5 grams of dicyandiamide, 1 gram of sebacic acid dihydrazide, sprayed on the workpiece by the above-mentioned production process, processed Into a wear-resistant anti-corrosion coating workpiece. The adhesion test was carried out according to the SY / T04442-1997 standard, which met the requirements of the industry standard Class A; the tensile strength was above 150MPa; the coating had no obvious change after 168 hours of high temperature and high pressure corrosion test; the friction pair was 20CrMo, which is a common material for sucker rods, The measured friction coefficient of the coating is 0.14, which is much lower than the friction coefficient of N80 tubing, which is 0.61; 400,000 times of reciprocating wear tests show that the wear resistance is 29.3 times higher than that of N80 tubing.

Embodiment 2

[0035] 95% of an oilfield is developed by directional wells, leading to the widespread existence of wells with large well deviation and complex well trajectory, resulting in serious eccentric wear of pipes and rods, which seriously affects the normal production of the oilfield. 102 wells with severe eccentric wear were selected for on-site tests. Wear-resistant and anti-corrosion inner-coated oil pipes were run in the eccentric wear wells of these wells during pump inspection. The results showed that the average wear cycle of the oil pipes had been extended from the original 104 days to 639 days. The average service life of oil pipes has been increased by more than 4 times, and the maximum has been extended to 6.1 times, which has significantly improved the wellbore efficiency and significantly extended the repair-free period of oil wells.

[0036] The formula is as follows (weight ratio):

[0037] epoxy resin 12 100 grams, 110 grams of cast stone powder, 4 grams of graphite...

Embodiment 3

[0048] Due to the long development time in a certain operation area of ​​an oilfield, the water content of oil wells is generally high, with an average of more than 80%, which leads to the coexistence of corrosion and wear problems, which intensifies the eccentric wear between the sucker rod and the tubing, and frequent tubing leakage, corrosion and perforation These problems have seriously affected the normal production of oil wells in this operation area. In this operation area, 24 wells with severe eccentric wear were selected for on-site tests. During the pump inspection, wear-resistant and anti-corrosion inner-coated tubing was run in the eccentric wear well sections of the 24 test wells. The results showed that the average wear cycle of the tubing had changed from the original 97 Days extended to 583 days, the average life of tubing increased by more than 3 times, and the maximum has been extended to 4.6 times, which significantly prolongs the repair-free period of oil we...

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Abstract

The invention relates to a production method of a wear-resistant and anti-corrosion inner coating oil pipe; the coating formula is: epoxy resin E 12 100, cast stone powder 90‑120, graphite 3‑5, molybdenum disulfide powder 10‑12, polyethylene powder 15‑20, dicyandiamide 2‑3.5, sebacic acid dihydrazide 1‑1.5, the production process includes oil removal Sandblasting, mixing, preheating, electrostatic spraying, curing, forming, grinding and polishing, inspection and powder recovery are eight steps. This method can significantly reduce the friction coefficient between the sucker rod and the inner wall of the tubing, and has anti-friction and anti-wear properties. Double function, can significantly improve the corrosion resistance of the inner wall of the oil pipe, has the advantages of short curing time, no change in the inner diameter of the oil pipe, good high temperature resistance, inhibition of scaling and waxing on the pipe wall, and long service life.

Description

technical field [0001] The invention relates to a production process of a wear-resistant and anti-corrosion inner-coated oil pipe, which belongs to the technical field of oil field wellbore prevention and control. Background technique [0002] The wear problem between the sucker rod and the tubing has always been one of the main reasons affecting the normal production of the oil field. The oil pipe inner coating protection technology is to apply a coating on the inner wall of the oil pipe to slow down the wear and prolong the service life of the oil pipe. In the prior art, it can be mainly divided into three categories: traditional inner coating, improved inner coating, and integral protective layer. Examples are as follows: [0003] CN87100920A discloses a kind of anticorrosion wear-resisting powder coating and the coating method of this coating, the weight percent of each component of this coating is: Epoxy E12 is 100, cast stone powder is 20-200, dicyandiamide is 3-5, n...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B05D5/00B05D5/08B05D7/22B05D7/24C09D163/00C09D123/06C09D7/12C09D5/08
Inventor 奚运涛朱天寿杨全安马红星何建军李琼玮张振云
Owner PETROCHINA CO LTD
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