How does the casing pipe work ? Choose your casing tubing !

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How does the casing pipe work ? Choose your casing tubing !

Once a well has been drilled, if it is to become a production well, the well must undergo completion. While drilling a well cuts through the rock formations and allows drilling engineers to reach the reservoir below, the raw sides of the well cannot support themselves. Similar to the bones of your spine protecting the spinal cord, casing is tubing that is set inside the drilled well to protect and support the ABTER STEEL.

You can choose the oil casing to use, select the casing size range as follows:

  • Standard: API 5CT
  • Steel Grade: J55, K55, N80, L80, C90, T95, P110, Q125, V150
  • Dimension: 4 1/2″–20″
  • Connection: BTC, STC, LTC

* P – plain end, S – short round thread, B – buttress, L – long round thread.

LabelsOutside
diameter (d/mm)
T&C
(kg/m)
Wall thickness

(t/mm)

Type of end-finish
12J55/K55M65L80/R95N80-1/QC90/T95P110Q125
123456789101112
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
28.00219.0841.677.72PS
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

 

 

Casing Source: ABTER STEEL

In addition to providing stabilization and keeping the sides of the well from caving in on themselves, casing protects the wellstream from outside contaminants, as well as any fresh water reservoirs from the oil or gas that is being produced.

Also known as setting pipe, casing a well involves running steel pipe down the inside of a recently drilled well. The small space between the casing and the untreated sides of the well is filled with cement to permanently set the casing in place.

Casing A Well

The casing is fabricated in sections, or joints, that are usually about 40 feet long and screwed together to form longer lengths of casing, called casing strings. Each end of the casing joint has male threads that are protected by cap called a thread protector until the casings are ready to be jointed. Then, a collar or coupling, composed of a short cylindrical steel pipe that is slightly larger in diameter than the joints and also has female threads, is used to connect the two male joint ends. A thread compound is used on the two ends to ensure a tight seal.

Coupling Source: abter steel pup joint coupling

Casing is run from the rig floor, connected one joint at a time by casing elevators on the traveling block and stabbed into the previous casing string that has been inserted into the well. Hanging above the drill floor, casing tongs screw each casing joint to the casing string.

Casing is run into the well and officially landed when the weight of the casing string is transferred to the casing hangers, which are located at the top of the well and use slips or threads to suspend the casing in the well.

A rounded section of pipe with an open hole on the end, a guide shoe is connected to the first casing string to guide the casing crew in running the casing into the well. Additionally, the outside of the casing has spring-like centralizers attached to them to help position in casing string in the center of the well.

After running the casing and before the cementing the well, a used drill bit is inserted into the well via a drillstring, and drilling fluid is then circulated for a certain amount of time to remove any remaining cuttings from the well. Also wall scratchers are dispatched into the well to remove any filter cake that may have formed on the sides of the well.

A cement slurry is then pumped into the well and allowed to harden to permanently fix the casing in place. After the cement has hardened, the bottom of the well is drilled out, and the completion process continues.

Casing Programs

Sometimes the well is drilled in stages called a casing program. Here, a well is drilled to a certain depth, cased and cemented, and then the well is drilled to a deeper depth, cased and cemented again, and so on. Each time the well is cased, a smaller diameter casing is used.

Casing program Source: abtersteel.com  OCTG CASING

The widest type of casing is called conductor pipe, and it usually is about 30 to 42 inches in diameter for offshore wells and 16 inches in diameter for onshore wells. The next size in casing string is the surface casing, which can run several thousand feet in length.

In some wells, protection or intermediate casing is run to separate challenging areas or problem zones, including areas of high pressure or lost circulation.

The last type of casing string that is run into the well, and therefore the smallest in diameter, is the production or oil string. The oil string is run directly into the producing reservoir.

Casing Alternatives

In an effort to save money, sometimes a liner string is run into the well instead of a casing string. While a liner string is very similar to casing string in that it is made up of separate joints of tubing, the liner string is not run the complete length of the well. A liner string is hung in the well by a liner hanger, and then cemented into place.

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