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[China]
Trade Verify
Address: Yongqing Industrial Zone, Langfang, Hebei, China
Contact name:Lily Gao
Langfang Baiwei Drill Co., Ltd. |
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Verified Suppliers
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4 1/2 double wall reverse circulation RC drill pipe for sale
Product Description
Gas-lift reverse circulation drilling technology is due to large backflow, fast backflow, high drilling efficiency, high drilling efficiency, long bit life, and good well quality. Drilling in complex formations is safe and reliable. Continuous sampling (coring) drilling, saving auxiliary time and reducing labor intensity, has been recognized in practice. It has become the main technical means for drilling water wells, geothermal wells, gas wells, coalbed methane wells, and large-diameter projects at home and abroad, and its application scope is getting wider and wider.
Working principle
The working principle of gas lift reverse circulation is similar to
that of an air compressor, that is, compressed air is sprayed into
the inner tube from the mixer through the double-wall movable drill
pipe, the inner wall of the outer wall pipe and the outer pipe ring
gap through the double-wall gas faucet or air box, forming Numerous
small bubbles rise rapidly along the inner tube and expand at the
same time, thereby generating air lift. As the compressed air
continuously enters the well fluid, a low-density gas-water mixture
is formed in the upper part of the mixer, and the fluid ratio in
the well is large. According to the principle of the connecting
device, the gas-water mixture in the inner tube flows upward under
the action of the pressure difference and flows into the well. The
cores or cuttings at the bottom are continuously discharged from
the surface and into the sedimentation tank. The sedimented mud
flows back into the hole and enters the circulating fluid space in
the drill pipe through the bottom of the hole.
Double wall drill pipe
| Type | O.D.of the outer tube (mm) | I.D.of the inner tube (mm) | Outer dianeter of joint (mm) | Type of threads | Effective length (m) |
| WB114/65 | 114 | 65 | 156 | 41F | 6 |
| WB127/76 | 127 | 76 | 162/168 | 41/21F | 6 , 9.5 |
| DB127/76 | 127 | 76 | 184 | 51/2FH | 9.5 |
| WB140/88 | 139.7 | 88 | 184 | 51/2FH | 6,9.5 |
| WB219/130 | 219 | 130 | 240 | Factory standard | 6,9.5 |
| WK76/32 | 76 | 32 | 78 | 3" Remet | 3 |
| WK102/41 | 102 | 41 | 103 | 4" Remet | 3 , 6 |
| WK114/52 | 114.3 | 52 | 116 | 4 1/2" Remet | 3 , 6 |
| WK114/38 | 114.3 | 38 | 114.3 | 4 1/2" Metzke | 3 , 6 |
| WK114/50 | 114.3 | 50 | 114.3 | 4 1/2" Remet | 3 , 6 |
| WP50/20 | 50 | 20 | 50 | 1 , 1.5 | |
| WP73/35 | 73 | 35 | 73 | 1 , 1.5 | |
| WP89/40 | 89 | 40 | 89 | 1 , 1.5 |
Our Services:
1. Drill pipe strictly according to API ISO9001 standard.
2. If you found to quality problems within one month of the package returned.
3. All strictly according to the contract and fulfill the obligations and responsibilities.
4. 24 hours online customer service,feel free contact us.
FAQ
Q: Are you trading company or manufacturer ?
A: We are factory.
Q: How long is your delivery time?
A: Generally it is 7-30 days if the goods are in stock. or it is
30-60 days if the goods are not in stock, it is according to
quantity.
Q: Do you provide samples ? is it free or extra ?
A: Yes, we could offer the sample need to pay the cost of products
and freight.
Q: What is your terms of payment ?
A: Payment<=1000USD, 100% in advance. Payment>=1000USD, 30%
T/T in advance ,balance before shippment.
