Overview of Oil Drilling Pipe  API 5CT Standard Seamless casing J55/ K55/ L80/ N80/ P110/ T95/ Q125

Oil drilling is a complex and demanding process that requires the use of high-quality equipment to ensure efficiency and safety. One crucial component of this equipment is the Oil drilling Pipe, specifically the  API 5CT standard seamless casing. This article provides an overview of the different grades of casing available, including J55, K55, L80, N80, P110, T95, and Q125, and highlights their unique properties and applications. The  API 5CT standard is a set of specifications developed by the American Petroleum Institute ( API) to ensure the quality and performance of Oil country tubular goods (OCTG). These specifications cover various aspects, including dimensions, mechanical properties, chemical composition, and testing requirements. By adhering to these standards, manufacturers can produce casing Pipes that meet the stringent demands of the Oil and gas industry. One of the most commonly used grades of casing is J55. This grade has a relatively low yield strength but offers excellent resistance to corrosion in mildly sour environments. It is suitable for shallow to medium-depth wells and is often used in regions with low-pressure reservoirs. K55, on the other hand, has a higher yield strength and is more resistant to corrosion. It is commonly used in wells with higher pressures and deeper depths. L80 is a higher-strength grade that offers enhanced mechanical properties and improved resistance to corrosion. It is often used in wells with moderate to high pressures and is suitable for both sweet and mildly sour environments. N80 is similar to L80 in terms of strength and corrosion resistance but is specifically designed for use in more severe sour environments. For wells with even higher pressures and more challenging conditions, P110 is the preferred grade. It has a high yield strength and excellent resistance to cracking, making it suitable for deep and high-pressure wells. T95 is another high-strength grade that offers improved resistance to sulfide stress cracking. It is commonly used in wells with high pressures and sour environments. 20 Bottles Essential Oils Case Custom EVA Hard Carrying Essential Oil Case with Middle Plate Q125 is the highest-strength grade of casing available. It has a very high yield strength and excellent resistance to corrosion and cracking. This grade is typically used in extreme conditions, such as deep and high-pressure wells with severe sour environments.
LabelsOutside diameter
(d/mm)
T&C
(kg/m)
Wall thickness  
(t/mm)
Type of end-finish
     
12    J55/ K55M65 L80/ R95 N80-1/Q C90/ T95 P110 Q125
4-1/29.50114.3014.145.21PSPS
 10.50114.3015.635.69PSBPSB
 11.60114.3017.266.35PSLBPLBPLBPLBPLBPLB
 13.50114.3020.097.37PLBPLBPLBPLBPLB
 15.10114.3022.478.56PLBPLB
511.50127.0017.115.59PSPS
 13.00127.0019.356.43PSLBPSLB
 15.00127.0022.327.52PSLBPLBSLBPLBPLBPLB 
 18.00127.0026.799.19PLBSLBPLBPLBPLBPLB
 21.40127.0031.8511.10PLBPLBPLBPLBPLBPLB
 23.20127.0034.5312.14PLBPLBPLBPLBPLB
 24.10127.0035.8712.70PLBPLBPLBPLBPLB
5-1/214.00139.7020.836.20PSPS
 15.50139.7023.076.98PSLBPSLB
 17.00139.7025.307.72PSLBPLBPLBPLBPLBPLB
 20.00139.7029.769.17PLBPLBPLBPLBPLB
 23.00139.7034.2310.54PLBPLBPLBPLBPLBPLB
 26.80139.7039.8812.70P
 29.70139.7044.2014.27P
 32.60139.7048.5215.88P
 35.30139.7052.5317.45P
 38.00139.7056.5519.05P
 40.50139.7060.2720.62P
 43.10139.7064.1422.22P
6-5/820.00168.2829.767.32PSLBPSLB
 24.00168.2835.728.94PSLBPLBPLBPLBPLBPLB
 28.00168.2841.6710.59PLBPLBPLBPLBPLB
 32.00168.2847.6212.06PLBPLBPLBPLBPLB
717.00177.8025.305.87
 20.00177.8029.766.91PSPS
 23.00177.8034.238.05PSLBPLBPLBPLBPLB
 26.00177.8038.699.19PLBPLBPLBPLBPLB
 29.00177.8043.1610.36PLBPLBPLBPLBPLB
 32.00177.8047.6211.51PLBPLBPLBPLBPLB
 35.00177.8052.0912.65PLBPLBPLBPLBPLB
 38.00177.8056.5513.72PLBPLBPLBPLBPLB
 42.70177.8063.5515.88P
 46.40177.8069.0517.45P
 50.10177.8074.5619.05P
 53.60177.8079.7720.62P
 57.10177.8084.9822.22P
7-5/824.00193.6835.727.62 
 26.40193.6839.298.33PSLBPSLBPLBPLBPLB
 29.70193.6844.209.52PLBPLBPLBPLBPLB
 33.70193.6850.1510.92PLBPLBPLBPLBPLB
 39.00193.6858.0412.70PLBPLBPLBPLBPLB
 42.80193.6863.6914.27PLBPLBPLBPLBPLB
 45.30193.6867.4215.11PLBPLBPLBPLBPLB
 47.10193.6870.0915.88PLBPLBPLBPLBPLB
 51.20193.6876.2017.45P
 55.30193.6882.3019.05P
7-3/446.10196.8568.6115.11PPPPP
8-5/824.00219.0835.726.71PSPS
 28.00219.0841.677.72 PS
 32.00219.0847.628.94PSLBPSLB
 36.00219.0853.5810.16PSLBPSLBPLBPLBPLBPLB
 40.00219.0859.5311.43PLBPLBPLBPLBPLB
 44.00219.0865.4812.70PLBPLBPLBPLB
 49.00219.0872.9214.15PLBPLBPLBPLBPLB
9-5/832.30244.4848.077.92
 36.00244.4853.588.94PSLBPSLB
 40.00244.4859.5310.03PSLBPSLBPLBPLBPLB
 43.50244.4864.7411.05PLBPLBPLBPLBPLB
 47.00244.4869.9511.99PLBPLBPLBPLBPLBPLB
 53.50244.4879.6213.84PLBPLBPLBPLBPLB
 58.40244.4886.9115.11PLBPLBPLBPLBPLB
 59.40244.4888.4015.47P
 64.90244.4896.5817.07P
 70.30244.48104.6218.64P
 75.60244.48112.5120.24P
10-3/432.75273.0548.747.09
 40.50273.0560.278.89PSBPSB
 45.50273.0567.7110.16PSBPSB
 51.00273.0575.9011.43PSBPSBPSBPSBPSBPSB
 55.50273.0582.6012.57PSBPSBPSBPSBPSB
 60.70273.0590.3313.84PSBPSBPSB
 65.70273.0597.7715.11PSBPSBPSB
 73.20273.05108.9417.07P
 79.20273.05117.8718.64P
 85.30273.05126.9420.24P
11-3/442.00298.4562.508.46
 47.00298.4569.959.53PSBPSB
 54.00298.4580.3611.05PSBPSB
 60.00298.4589.2912.42PSBPSBPSBPSBPSBPSBPSB
 65.00298.4596.7313.56PPPPP
 71.00298.45105.6614.78PPPPP
13-3/848.00339.7271.438.38
 54.50339.7281.119.65PSBPSB
 61.00339.7290.7810.92PSBPSB
 68.00339.72101.2012.19PSBPSBPSBPSBPSBPSB
 72.00339.72107.1513.06PSBPSBPSBPSBPSB
1665.00406.4096.739.53
 75.00406.40111.6211.13PSBPSB
 84.00406.40125.0112.57PSBPSB
 109.00406.40162.2116.66PPPPP
18-5/887.50473.08130.2211.05PSBPSB
2094.00508.00139.8911.13PSLBPSLB
 106.50508.00158.4912.70PSLBPSLB
 133.00508.00197.9316.13PSLB
In addition to their unique properties, these casing grades also come in different sizes and weights to accommodate various well designs and drilling requirements. The dimensions and weights of the casing Pipes are specified in the  API 5CT standard, ensuring compatibility and ease of use. When selecting the appropriate casing grade for a specific

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