SY/T 5390-1991 Drilling fluid corrosion performance test method Drill pipe corrosion ring method SY/T5390-1991 standard download decompression password: www.bzxz.net

Petroleum and Natural Gas Industry Standard of the People's Republic of China SY / T 5390 -91
Test Method for Corrosion Performance of Drilling Fluid
Drill Pipe Corrosion Ring Method
1991-07-19 Issued
Ministry of Energy of the People's Republic of China
1991-12-01
Subject Content and Scope of Application
Petroleum and Natural Gas Industry Standard of the People's Republic of China Test Method for Corrosion Performance of Drilling Fluid
Drill Pipe Corrosion Ring Method
SY / T 5390-91
This standard specifies the test procedure for testing the corrosion performance of drilling fluid using a corrosion ring installed in the drill pipe column and the method for calculating the corrosion rate and corrosion classification.
This standard is applicable to the on-site testing of the corrosion performance of oil and gas drilling fluids. This standard is not applicable to the detection of drilling tool corrosion such as hydrogen embrittlement, stress corrosion, fracture or other cracks. 2 Main instruments, reagents, materials and test pieces
2.1 Instruments
a. Balance: sensitivity lrng;
b. Magnifying glass: magnification 20 times;
Metallurgical microscope: magnification 50-500 times.
2.2 Reagents
Anhydrous acetone or anhydrous ethanol;
Petroleum ether;
Sodium nitrosylferrocyanide (Na2Fe(CN)NO) d. Hexamethyltetramine (CH4)rN4 or 7019 corrosion inhibitor; hydrochloric acid.
Sealable plastic packaging bag,
2.4 Test pieces
2.4.1 The structure and technical requirements of the corrosion ring test piece are shown in Appendix C (reference). 2.4.2 The size of the corrosion ring
The data of the corrosion ring test piece are shown in Appendix B (reference). 2.4.3 Material of corrosion ring
The chemical composition of the corrosion material should be the same or similar to that of the drill pipe joint. 2.4.4 Marking of corrosion ring
Corrosion rings should be numbered with steel letters so that they can be permanently identified. 3 Test procedure
3.1 Preparation of corrosion rings
a. Scrub the corrosion ring with a hard fiber brush and detergent, then wash it with water; b. Rinse the corrosion ring after washing with anhydrous acetone or anhydrous ethanol, blow dry with cold air, and place it in a desiccator to maintain the quality; c. Weigh it with a balance (accurate to 1m), and then immediately seal it with a plastic bag. 3.2 Installation of corrosion ring
Approved by the Ministry of Energy of the People's Republic of China on July 19, 1991 and implemented on December 1, 1991
SY/T 5390-91
1 Clean the sleeve and install the prepared corrosion ring at the joint of the first drill pipe on the drill chain: a corrosion ring can also be installed at the joint of the square drill pipe to monitor the corrosion performance of the drilling fluid at that place. 3.3 Removal of corrosion ringwww.bzxz.net
Take the corrosion ring that has been tested for at least 40 in the well, wipe off the drilling fluid residue on the corrosion ring, observe with the naked eye whether the corrosion is serious (if it is serious, protective measures should be taken immediately), then immediately apply a layer of grease or oil on the surface of the erosion ring, put it into a plastic bag and seal it, and send it to the tester.
3.4 ​​Initial cleaning of corrosion ring
Wash with acetone or petroleum ether to remove the oil or grease on the surface. 3.5 Drip test
10g/L sodium nitrosylferrocyanide is dripped for drip test, and the corrosion products and mineral scale layer of the corrosion ring are observed. If the color changes to purple-red, it proves that sulfide exists. .6 Pickling and weighing
Scrub with a hard fiber brush, and then put the corrosion ring into a solution containing 110172g hydrochloric acid and 5 dimethyltetramine or 57109 buffer per liter for 2 to 3 times, soaking for 5 to 10s each time, then rinse thoroughly with water, and rinse thoroughly with anhydrous ethanol or acetone! Weigh after washing (accurate to 1m). If the quality loss caused by mechanical wear is serious, it should be noted. 3.7 Pitting determination
\.7.1 If obvious pitting corrosion is found on the corroded surface, the number of pitting corrosion per unit area, the size of pitting corrosion, the shape of pitting corrosion and the depth of the pitting corrosion shall be determined, and described on the report sheet. .7.2 Use naked eyes and magnifying glass to find pitting; use metallographic microscope to measure pitting depth by double focusing method. : Calculate corrosion rate and corrosion classification. Calculate corrosion density according to the following formula: 87.60 (mm,) R--average corrosion rate of metal, kg (m2·a); corrosion damage mass before test, mg, corrosion damage mass after test, mg, total surface area of ​​​​the corrosion ring. cm, total time of corrosion ring in drill pipe, h. 4.2 Corrosion classification The evaluation classification of liquid corrosion performance of drilling batches is shown in the following table. Corrosion conditions
Average corrosion rate 0～0.1kg／(m2a), no pitting corrosionAverage tumor corrosion rate 0.1-0.4kg／(m2·a), no pitting corrosionAverage corrosion rate greater than 0.4kg/（m2a）: or pitting corrosion: if the corrosion ring has pitting corrosion, the evaluation level should be reduced by one level. 2
Evaluation level
Fill in the report form
SY / T 5390--91
The corrosion performance and evaluation level of the drilling fluid obtained in the test should be filled in the drilling fluid corrosion performance report form, see Appendix A (Supplement) Recommended protective measures
According to the evaluation level obtained in Article 4.2, it is recommended to take protective measures to reduce the corrosion of drilling fluid to drilling tools. 3
Test period
Corrosion ring number
Test well section
Test time
Drilling fluid performance
Position of corrosion ring in drill pipe
Corrosion rate
Pitting test results
Other corrosion information description
Evaluation paper type
Evaluation opinion
Tester:
Report writer:
Approved by:
SY / T 539091
Appendix A
Format of drilling fluid corrosion performance report
(supplement)
Drilling fluid corrosion performance report
Test well
Corrosion ring material
Corrosion product color
Corrosion ring collapse test quality
Corrosion ring post-test quality
Corrosion ring model
3' / ,EH
4' /2F.H.
4' /,EH
5'/ 21.F.
SY /T 5390 91
Appendix B
Corrosion ring specimen data sheet
(reference)
Bin specimen size
C1 Corrosion ring structure
The corrosion ring structure is shown in Figures C1a, b.
C2 Technical requirements for corrosion rings
SY / T 5390 91
Appendix C
Structure and technical requirements for corrosion rings
(reference)
C2.1 The corrosion ring should match the inner diameter of the drill pipe joint and fit into the groove of the inner thread of the drill pipe near the end of the outer thread, so as to minimize the turbulence of the drilling fluid. For the data of the corrosion ring specimen, see Appendix B (reference). C2.2 In order to eliminate galvanic corrosion, a high-temperature resistant plastic protective layer is used. Of course, if the corrosion ring is directly made of drill pipe material or similar materials, it is called direct processing. If a high-temperature resistant plastic protective lip is used, it is used in conjunction with a metal ring, and its matching structure and installation are shown in Figure 1c.
C2.3 The surface roughness requirement of the corrosion ring is R, which is 3.2μm. If the mechanical processing meets the requirements, it is then polished with fine sand until it meets the requirements.
c2.4 Use a vernier caliper with an accuracy of 0.02mm to accurately measure the inner diameter and width of the corrosion ring and calculate the inner surface area of ​​the ring. C2.5 The corrosion ring should be numbered.
Plastic protective layer
Corrosion ring
Steel ring
External thread
Internal thread
Corrosion ring
Figure Structure and installation diagram of drill pipe corrosion ring a is a steel magic corrosion ring; b is a magic corrosion ring with a plastic protective layer; c is a schematic diagram of the corrosion ring installation SY / T 539091
C2.6 In order to prevent the plastic protective layer on the outer edge of the corrosion ring or the gap between the drill pipe joint and the ring from corroding, it must be sealed with epoxy paint coating. C2.7 Epoxy paint coating formula:
Use toluene-n-butanol with a volume ratio of 4 to 1 as solvent, weigh 20g of epoxy paint, add 1.5ml of ethylenediamine and stir, add solvent to dilute to appropriate concentration, use rough scraping to evenly apply to the outer surface of the ring, put it in an oven at 100℃ and bake for 0.5h is enough. Additional remarks:
This standard is proposed and managed by Renyou Drilling Engineering Professional Standard Promotion Committee. This standard is drafted by Sichuan Petroleum and Natural Gas Research Institute: Wang Hanhua and Wang Ke are the drafters of this standard.
This standard is still valid after the review in 199, and the review result has been approved by the State Administration of Petroleum and Chemical Industry.
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