I. TSEEM CEEB RAU COV Coiled Tubing
Internationally, coiled tubing (CT) for oil production primarily utilizes high-strength low-alloy steels and specialty alloys to meet corrosion resistance, high-pressure tolerance, and fatigue resistance requirements in various downhole environments. Cov ntaub ntawv tseem ceeb thiab lawv cov yam ntxwv:
Cov Hlau Hlau
Cov Qib Kawm: Qt-800, Qt-900 (Quenched & Tempered)
Cov Khoom: Tus nqi qis, muaj zog nruab nrab (80 -} 100 ksi paib zog). Haum rau tsawg - qhov siab / tsawg-kub ua haujlwm (<120°C) like routine workovers, sand washing, and acidizing.
Txwv: tsis zoo corrosion tsis kam; Tsis tsim nyog rau h₂s / co₂ acidic zoo.
High - muaj zog tsawg -} alllole steel (hsla)
Cov qib kawm: CT-100, CT-110 (100-110 ksi paib zog)
Properties: Enhanced strength/toughness via micro-alloying (Cr, Mo, Ni). Ideal for deep wells (>4,000m) thiab siab - kev ua haujlwm siab (piv txwv li, pob txha lov, ct drilling).
Cov ntawv thov: Shale roj av khov kho, ua tiav kev sib txawv.
Corrosion -} tiv taus alloys (CRA)
(1) 13cr martensitic stainless hlau
Cov Khoom Muag: Coo - awrantant; muaj feem xyuam rau high- co dej Wells (<150°C).
Txwv: h {- rhiab; nquag mus rau sulfide kev ntxhov siab tawg (SSC).
(2) 22cr / 25CR RLLEX Stainless Hlau
Cov Khoom Siv: Tsis kam rau H₂S + COry Corrosion; Siv hauv cov acidic teb (piv txwv li, Middle East, North Seas).
Cov Qib Kawm: UNR UNST S31803 (22CR), UNL UNST S32750 (25CR).
(3) Nickel - Raws alloys (Inconel 625/825/825/825/825
Properties: Extreme corrosion resistance (H₂S, Cl⁻, high-temperature); for ultra-deep wells (>6,000m) lossis geothermal hmoov.
Drawbback: Cov nqi siab (10 × tam sim tshaj li tus qauv hlau).
Ii. Cov Ntawv Sau Cov Ntaub Ntawv Xaiv
|
Khoom Hom |
Cov Ntawv Thov Pom Zoo |
Cov xwm txheej tsis zoo |
|---|---|---|
|
Carbon Steel (Qt-800) |
Ntiav tau zoo huv si, nitrogen nqa |
Acidic Wells (H₂S / CO₂), HPHT WELLS |
|
HSLA (CT-110) |
Tob - Zoo khaus, ct drilling |
Cov neeg muaj kev txhim kho corrosive |
|
13cr Stainless |
Kev nyab hnyav, nruab nrab -} qis temp chav txhaj tshuaj |
High H₂S environments (>50 ppm) |
|
22CR / 25CR / LOUNLEX |
Acidic teb (piv txwv li, nruab nrab sab hnub tuaj) |
Tus nqi -} Cov phiaj xwm rhiab heev |
|
Inconel 625 |
Ultra-deep wells (>150 Qib), Sour Gas |
Cov haujlwm niaj hnub (tus nqi qis - efficiency) |
III. Cov Khoom Siv Hauv Ntiaj Teb & Tiam
Manufacturers
Mus caum (Argentina): HSLA Hlau & 13cr CT.
Sandvik (Sweden): Precision 22cr /Cr ruplex tubing.
Zoo zog zog (US): Qeeb zog -}}} optimeccized CT-100/110 Series.
Tshuab Tiam
Kev sib xyaw me me: carbon {{- fiber ntau- reafuction nrog kev tiv thaiv corrosion zoo tshaj.
Ntse tubing: embedded fiber - qhov muag tsis zoo rau tiag- lub sijhawm kub / strain saib xyuas.
IV. Cov Lus Taw Qhia Xaiv
Cov haujlwm niaj hnub - 90/100 carbon hlau (nqi zoo tshaj plaws-ua).
Acidic (h₂s) ib puag ncig → 22cring ruplex lossis inconel 625.
Ultra -} Deep / Siab- temp Wells} Cov dej ntsuab → Nickel Alloys lossis Composites.
