Halliburton HT-400 Twj

Lub Hwj Chim Kawg ntawm HT-400 ™ yog lub hub hloov dua siab tshiab uas hloov lub cav hloov lub zog hloov mus rau hauv hydrostatic siab. Nws lub tswv yim tsim nyob rau ntawm lub hauv paus metric ntawm 'siab zog ceev'. Los ntawm kev ua kom zoo ntawm cov qauv nrog qhov tseeb, peb cov engineers tau ua tiav cov txiaj ntsig ruaj khov txhawb nqa txog li 800 horsepower (HHP) thaum tswj qhov hnyav txwv rau qhov siab hoisting lossis compact tsheb installation.

Lub Box Structure: Yeej ntawm Vuam Tshuab

Tsis zoo li cov hlau cam khwb cia ib puag ncig, HT-400™ nta lub zog steel welded qauv (Weldment) rau nws lub zog tsev. Qhov kev xaiv tsim no yog txhob txwm tshaj tawm, hauv paus hauv kev nkag siab zoo ntawm kev qaug zog tawg tshuab.

• Kev qaug zog tsis kam: Lub twj tso kua mis lub cev tau raug mob hnyav thaum lub sijhawm ua haujlwm tawg thiab cementing. High- lub zog steel daim hlau, tom qab precision vuam thiab kev kho cua sov, tshem tawm cov kev ntxhov siab sab hauv. Muab piv rau cov qauv cam khwb cia, lawv pom muaj zog ntau dua nyob rau hauv tensile thiab shear stresses, txo qhov kev pheej hmoo ntawm lub plhaub tawg.
• Qhov zoo ntawm lub teeb yuag: Cov qauv welded ua rau cov engineers txo cov khoom tuab hauv cov khoom tsis yog -load- cov cheeb tsam thaum txhawb nqa qhov tseem ceeb ntawm cov khoom thauj - cov ntsiab lus zoo li cov kabmob vaj tsev. Qhov no tso cai rau HT-400 ™ kom muaj qhov tshwj xeeb ntawm cov txheej txheem nruj thaum ua kom nws qhov hnyav ntawm 5,500 thiab 6,500 phaus (2,500–2,950 kg), nyob ntawm kev teeb tsa gearbox. Qhov no yog qhov tseem ceeb tshwj xeeb tshaj yog rau offshore platforms lossis helicopter thauj mus rau qhov chaw nyob deb.
• Sab laug-Right Drive Configuration: Tsim los kom haum raws li cov txheej txheem nyuaj ntawm cov tsheb sib tsoo niaj hnub thiab cov khoom tawg, HT-400™ vaj tse muaj ob sab laug- tes thiab sab xis- tes tsav teeb tsa. Daim iav tsim no ua rau ntxaib -pamp skid installation, optimizing qhov chaw siv thaum simplifying tsav ncej sib txuas. Qhov tseem ceeb, txawm hais tias cov khoom sib hloov sab hauv feem ntau hloov pauv tau, lub tsev nws tus kheej tsis hloov pauv vim muaj kev hloov pauv hauv kev coj tus kheej qhov chaw thiab cov ko taw mounting.

Gear Transmission System: Precision Reduction thiab Torque Amplification

Lub plawv ntawm lub hwj chim kis tau tus mob nyob rau hauv nws cab iav txo mechanism. Lub HT-400™ ntiav cov qauv tsim no tsis yog spur lossis bevel gears, feem ntau vim tias cov iav iav muaj qhov tshwj xeeb ntawm ib theem txo qis thiab kev ua haujlwm du, zoo nqus cov pa tawm ntawm lub plunger lub reciprocating motion. Peb muab ob qho khoom siv zoo tshaj plaws teeb tsa kom haum rau kev ua haujlwm sib txawv:

1. Holroyd iav teeb (8.6: 1 txo piv)

• Cov yam ntxwv tsim: Qhov no yog ib qho - lub hnab ntim khoom tsim. Cov kab hlau tawv tawv tau tsav lub centrifugally cam khwb cia phosphor-bronze iav nplhaib.
• Daim ntawv thov Scenario: Qhov kev teeb tsa no muab lub zog nkag ntawm 600 BHP (brake horsepower), ua rau nws mus - rau kev xaiv rau cementing thiab acidizing ua haujlwm. Holroyd hniav profile tus meshing cov yam ntxwv muab tshwj xeeb qis - tswj ceev, uas yog qhov tseem ceeb rau kev ua haujlwm uas yuav tsum tau tswj xyuas cov cement paug.
• Cov Khoom Siv Kev Tshawb Fawb: Lub nplhaib hniav yog ua los ntawm cov tooj liab tshwj xeeb uas muaj kev sib txhuam zoo heev thiab kev tiv thaiv - muaj peev xwm ua noj. Nyob rau hauv cov xwm txheej ntawm ciam teb lubrication, cov bronze raws li cov khoom siv fij tseg tuaj yeem tiv thaiv cov khoom kim heev steel cab iav los ntawm hnav.

2. Cone Tsav iav teeb (8.4: 1 txo piv)

• Tsim Cov Nta: Qhov siab dua ob -Cov qauv tsim muaj lub moos iav- zoo li tus cab uas nyob ib puag ncig lub iav curvature, ua rau muaj cov hniav ntau ntxiv ib txhij.
• Daim ntawv thov scenario: Qhov ntsuas hluav taws xob nkag tau nce mus rau 800 BHP. Lub peev xwm thauj khoom siab no ua rau nws yog qhov kev xaiv zoo tshaj plaws rau siab -load, ntev- lub sijhawm ua haujlwm tsis tu ncua xws li hydraulic fracturing thiab coiled tubing ua haujlwm.
• Qhov zoo ntawm cov hniav tshiab yog raws li hauv qab no: qhov chaw sib txuas ntxiv tuaj yeem cuam tshuam lub siab ntawm cov hniav, txo qhov kev sib cuag nrog kev ntxhov siab, ua kom lub neej qaug zog, thiab tiv taus lub siab nrawm nrawm hauv kev ua haujlwm tawg.

Crankshaft thiab txuas pas nrig sib dhos: lub siab precision ntawm kev hloov dua siab tshiab

Kev hloov los ntawm kev sib hloov mus rau reciprocating motion tshwm sim nyob rau hauv lub crankshaft thiab txuas pas nrig mechanism, uas yog lub feem ntau concentrated cheeb tsam ntawm mechanical kev nyuaj siab.

• Forged Crankshaft: Lub HT-400™ crankshaft yog forged los ntawm siab- zoo alloy steel thiab tau txais kev kho cua sov tag nrho nrog rau qhov tawv tawv. Nws peb lub crankshafts yog teem rau ntawm 120-degree theem kaum sab xis, thiab qhov peb -lub tog raj kheej tsim optimizes kua dynamics rau cov tsis xws luag, txo cov kev hloov ntawm lub siab fluctuations nyob rau hauv lub pa manifold. Lub crankshaft tau txais kev txhawb nqa los ntawm plaub lub ntsiab bearings-ob sab nraud thiab ob sab hauv. Qhov kev txhawb nqa plaub-point no txo ​​qis khoov deformation nyob rau hauv hnyav loads, kom ntseeg tau tias txawm tias muaj kev ntxhov siab faib thoob plaws cov pas nrig sib txuas.
• Forged aluminium txuas pas nrig: Qhov no yog ib qho tseem ceeb engineering xaiv. Lub HT-400™ siv lub zog siab forged aluminium alloy txuas rods es tsis txhob siv cov pa hlau.

.Inertia kom zoo dua: Aluminium qhov ceev tsuas yog ib qho -peb peb ntawm cov hlau. Ntawm cov tswv yim ceev mus txog 2,400 RPM, txo cov reciprocating inertia loj ntawm cov pas txuas txuas ua rau txo qis kev cuam tshuam ntawm cov crankshaft thiab bearings, yog li txhim kho kev ua haujlwm zoo.

.Kev tswj cua sov: Cov thermal conductivity zoo heev ntawm aluminium alloy tuaj yeem pab hloov cov cua kub sib txhuam uas tsim los ntawm crank tus pin bearing, thiab tiv thaiv cov kabmob ntawm overheating thiab tsis ua haujlwm.

.Failure tiv thaiv: Nyob rau hauv lub lubrication tsis ua hauj lwm tsis ua hauj lwm, aluminium txuas pas nrig yuav yaj los yog tawg ua ntej forged steel crankshaft, ua raws li ib tug "neeg kho tshuab fuse", yog li tiv thaiv lub crankshaft muaj nuj nqis ntau thiab lub thawv los ntawm kev puas tsuaj tag.

• Crosshead thiab Guide Plate: Cov cam khwb cia hlau crosshead txav reciprocally raws cov hlau slides, coj los ntawm ob tug bronze nkawm khau. Cov slides yog ruaj ntseg nyob rau hauv lub tsev los ntawm ib tug tshiab expanding clamp mechanism. Qhov kev tsim no tso cai rau cov neeg ua haujlwm saib xyuas kom hloov cov swb yam tsis muaj kev cuam tshuam cov crankshaft, thaum tso cai rau kev tswj hwm ntawm tus ntoo khaub lig khiav kev tshem tawm (tus qauv: 0.006-0.012 ntiv tes) los ntawm kev hloov kho shim, tiv thaiv kev hnav tsis zoo.

Lubrication System: Qhuav roj lauj kaub thiab yuam lubrication

HT-400 ™ nta cov dej ntub dej ntub dej, nrog cov roj lubricating khaws cia ncaj qha rau hauv qab ntawm lub thawv iav cab.

• Ua-hauv cov roj twj tso kua mis: Lub twj tso kua mis crescent yog tsav ncaj qha los ntawm tus cab cab. Qhov kev tsim no ua kom cov roj ntws yog proportional rau lub twj tso kua mis kev sib hloov ceev, lav tag nrho lubrication ntawm kev sib txhuam tseem ceeb hauv txhua qhov kev ua haujlwm.
• Roj circulation system: Lubricating roj yog rub los ntawm cov roj lauj kaub thiab thawj zaug dhau los ntawm cov tubular cua kub exchanger (siv cav coolant los yog seawater rau qhov kub thiab txias) tswj kom zoo viscosity (feem ntau tshaj 40℃F / 4.4℃rau pib, nrog siab - tswj kub thaum ua haujlwm). Cov roj ces ntws los ntawm Schroeder sib nqus lim thiab 25-micron zoo lim.
• Filter Protection: Lub lim hlau nplaum ntes cov ntaub ntawv hlau los ntawm iav hnav, thaum lub lim ntawv tshem tawm lwm cov khoom paug. Lub kaw lus bypass valve ua kom tsis muaj kev cuam tshuam cov roj ntws thaum lub lim tau txhaws lossis txias - pib roj viscosity siab dhau, txawm tias qhov no yuav txo qis kev pom kev ua haujlwm ib ntus los tiv thaiv cov khoom siv tshuab.
• Cov ntsiab lus tseem ceeb ntawm cov roj lubrication: Cov roj siab tau xa mus rau qhov kev sib tw ntawm txoj kev sib tw, cov kabmob cab cab, crankshaft lub ntsiab bearing, thiab lubricates loj kawg ntawm cov pas nrig txuas ntawm cov roj sab hauv ntawm lub crankshaft. Lub taub hau tus pin (Lub dab teg Pin) tau txais cov roj nplaum los yog lub siab lubrication los ntawm cov roj drilled hauv cov pas nrig txuas.

Qhov kawg hydraulic, lub pem hauv ntej ntawm kev siv twj tso kua mis, ncaj qha ntsib cov teeb meem ntawm kev kub siab, corrosion, thiab hnav. Lub HT-400™ hydraulic kawg nta ib qho qauv peb- lub tog raj kheej tsim, nrog txhua lub plunger ua ke nrog lub taub hau forged steel twj tso kua mis. Cov qauv tsim qauv no txo ​​qis tus nqi txij nkawm-yuav tsum yog lub tog raj kheej raug eroded, cov neeg siv tsuas yog yuav tsum tau hloov lub tog raj kheej tshwj xeeb yam tsis tau khawb tag nrho hydraulic kawg.

Structure: Standard thiab HCLE

Txhawm rau kom haum rau ntau hom kev tshaj tawm ua haujlwm, peb tau tsim ob lub ntsiab lus channel geometry:

1. Standard Fluid End:

• Structure: Tus ntoo khaub lig- tus qauv tsim tau txais yuav, thiab lub tshuab nqus tsev nqus thiab qhov tso tawm valve tau teeb tsa ntsug.
• Qhov zoo: Cov qauv tsim yog compact, lub ntim tuag me me, thiab lub ntim efficiency siab.
• Applicability: Zoo heev rau cementing, acidizing thiab dav siv dej. Nws yog qhov kev xaiv zoo tshaj plaws thiab kev xaiv zoo rau cov kua dej huv lossis cov xuab zeb qis ua haujlwm.
• Specifications: Tau tshaj ntau qhov ntau thiab tsawg xws li 3-3 / 8 ", 4", 4-1 / 2 ", 5", thiab 6", nrog rau siab tshaj plaws muaj peev xwm ntawm 20,000 psi.

2. Lub HCLE (High Sand Ratio Low Erosion) hydraulic kawg:

• Structure: Tus tsim txais yuav ib tug "T-zoo li tus" los yog ncaj-los ntawm configuration. Lub qhov nqus valve thiab lub qhov tso pa tawm yog qhov zoo tshaj plaws nyob rau hauv cov nqe lus ntawm cov dej dynamics, feem ntau ua raws li txoj kab ncaj nraim los yog nrog kev hloov pauv.
• Cov txiaj ntsig zoo: Nws txo qis qhov turbulence thiab vortex ntawm cov kua hauv lub twj tso kua mis, yog li txo qhov kev yaig ntawm lub twj tso kua mis lub cev los ntawm siab - xuab zeb ceev - muaj cov kua dej (Washout).
• Kev siv tau: Tshwj xeeb tsim kho rau hydraulic fracturing (Frac), tshwj xeeb tshaj yog nyob rau hauv kev xav tau tej yam kev mob uas muaj siab -concentration proppants. Nws txuas ntxiv lub neej kev pab cuam ntawm lub taub hau lub taub hau thaum thauj cov slurries abrasive.

Core Materials thiab Manufacturing txheej txheem

Raws li OEM, Halliburton tuav ze rau - cov qauv xaiv cov khoom zoo meej kom ntseeg tau tias txhua yam tuaj yeem tiv taus kev ua haujlwm hnyav.

• Cov khoom siv ntawm lub taub hau lub taub hau (4330V forged steel):

.Peb feem ntau xaiv AISI 4330V (vanadium hloov nickel-chromium-molybdenum alloy steel) ua cov khoom ntawm hydraulic kawg twj taub hau.

.Technical Advantages: 4330V steel qhia superior hardenability thiab cuam tshuam toughness piv rau standard 4140 steel. Peb cov txheej txheem tsim khoom siv lub tshuab nqus tsev degassing kom txo qis cov ntsiab lus hydrogen thiab tsis yog-metallic inclusions nyob rau hauv cov hlau, uas yog ib qho tseem ceeb rau kev tiv thaiv qaug zog tawg pib nyob rau hauv siab - tej yam kev mob siab.

.Autofrettage: Tag nrho cov siab - siab hydraulic units undergo autofrettage ua ntej precision machining. Los ntawm kev siv ultra-siab siab mus rau sab hauv kab noj hniav, cov phab ntsa hlau ua rau cov yas deformation, tawm hauv seem compressive kev nyuaj siab tom qab tso siab. Qhov kev ntxhov siab ua ntej no ua rau muaj txiaj ntsig zoo rau cov kev ntxhov siab tensile tsim thaum lub sij hawm nqus dej, ua kom lub twj tso kua mis lub neej qaug zog ntau zaus.

• Valves thiab rooj zaum:

.Materials: Cov khoom siv yog ua los ntawm SAE 8620 lossis 20CrMnTi qib siab carburized steel.

Kev kho cua sov: Tom qab sib sib zog nqus carburizing thiab quenching, lub hardness nto mus txog HRC 58-62, exhibiting exceptional hnav tsis kam. Cov tub ntxhais tswj hwm HRC 30-40 toughness los tiv thaiv kev cuam tshuam loj heev los ntawm ntau pua lub rooj zaum valve cuam tshuam ib feeb, tiv thaiv kev puas tsuaj.

.Design paub meej: Lub rooj zaum lub rooj zaum sab nraud yog feem ntau tsim nrog lub taper (piv txwv li, 1: 4 lossis zoo sib xws piv), uas tso siab rau ib qho kev cuam tshuam kom ua tiav tus kheej - xauv sealing nyob rau hauv siab. Ib lub nplhaib O- kuj tseem suav nrog los tiv thaiv kev ntxuav tawm.

• Plunger:

.Colmonoy® Txheej: Cov txheej txheem plunger nta lub hauv paus hlau nrog cov tshuaj tsuag -welded txheej ntawm Colmonoy® 88 los yog cov npib tsib xee zoo sib xws -raws li superalloy. Cov chromium, boron, silicon, thiab tungsten alloy yog muab tso rau hauv lub hauv paus los ntawm cov tshuaj tsuag welding, ua tiav lub hardness ntawm HRC 60+. Cov txheej tsis tsuas yog hnav- resistant tab sis kuj corrosion heev - resistant rau ntsev thiab acids vim nws cov ntsiab lus siab nickel.

.Ceramic Plugs: Rau huab corrosive los yog abrasive heev ib puag ncig, peb muab zirconia ceramic plugs. Txawm hais tias lawv cov nqi siab dua thiab thermal shock rhiab heev, cov plugs no muaj qhov tshwj xeeb zoo nkauj thiab tsis muaj kev sib txhuam coefficient, ua rau lub neej ntev ntev.

Spacer tivthaiv

Cov kab sib cais yog tus choj txuas lub zog kawg thiab hydraulic kawg, thiab nws cov qauv qhib yog qhov tseem ceeb heev.

• Muaj nuj nqi: Nws muab lub qhov rais soj ntsuam, tso cai rau cov neeg ua haujlwm pom kev tshawb xyuas lub plunger foob (packing) rau cov xau. Qhov tseem ceeb tshaj, nws lub cev cais ob yam khoom, tiv thaiv corrosive fracturing kua los yog cement slurry los ntawm kev nkag mus rau lub hwj chim -sab crankcase emulsified lubricating roj, yog li tsis txhob muaj kev puas tsuaj rau lub hwj chim - sab tsis ua hauj lwm.
• qauv:

1. Tus qauv L-2 nta cov qauv welded rau kev txhim kho durability, feem ntau siv nyob rau hauv 800HP fracturing configurations.
2. Hom L-4, featuring 12 ywj siab txhawb nqa kav bolted ua ke, yog ib lub teeb yuag tsim feem ntau siv nyob rau hauv 600HP cementing configurations.

HT-400™ qhia tau hais tias muaj ntau yam zoo kawg nkaus los ntawm nws qhov kev ua tau zoo. Los ntawm kev hloov mus rau plunger diameters ntawm qhov sib txawv, cov neeg ua haujlwm tuaj yeem hloov pauv ntawm qhov siab tshaj plaws thiab qhov siab tshaj plaws hloov chaw. Lub twj tso kua mis ib leeg no tuaj yeem ua tau ob qho tib si siab - kev ntsuas siab ntawm 20,000 psi thiab cov dej ntim loj.

Cov ntaub ntawv kev ua tau zoo (raws li 8.6: 1 iav piv, 2,100 RPM cav ceev)

Nco tseg: Cov ntaub ntawv yog xam raws li 90% volumetric efficiency. Qhov siab tshaj plaws input zog yog txwv rau 600 BHP (Holroyd iav) los yog 800 BHP (Cone Drive iav).

Lub cev qhov ntev thiab qhov hnyav

Lub compact tsim ntawm HT-400™ tso cai rau seamless kev koom ua ke rau hauv ntau lub tsheb-mounted lossis skid-mounted systems.

• Ntev: Kwv yees li ntawm 56 mus rau 77 ntiv tes (1,422-1,956 mm), nyob ntawm seb lub spacer tau nruab thiab hom hydraulic kawg.
• Dav: kwv yees li 50 nti (1,270 mm).
• Qhov siab: kwv yees li 47 ntiv tes (1,194 mm).
• Qhov hnyav qhuav: Kwv yees li 5,500 phaus (2,500 kg) txog 6,500 phaus (2,950 kg). Muab piv rau Quintuplex twj tso kua mis ntawm tib chav kawm, nws muaj qhov zoo ntawm qhov hnyav, txo cov nqi tsheb thauj mus los thiab chassis load.

Raws li cov chaw tsim khoom OEM, peb nkag siab tias kev ntseeg tau ntawm cov cuab yeej siv tsis yog nyob ntawm tus qauv tsim xwb, tab sis kuj yog kev saib xyuas kom raug thiab siab - cov khoom zoo. Tshooj lus no muab cov tswv yim tswj xyuas tseem ceeb raws li HT-400 ™ Pump Maintenance and Repair Manual.

Sealing system: ntim thiab sealing

High pressure seal yog feem ntau hloov cov khoom siv hauv cov twj tso kua mis.

• Packing Assembly:

1. Lub nplhaib header, feem ntau yog ua los ntawm HNBR lossis bronze, yog nyob rau ntawm lub hauv paus ntawm cov khoom sib dhos los muab kev txhawb nqa.
2. Pressure Rings: Cov ntsiab lus tseem ceeb sealing. Rau cov qauv kev ua haujlwm, peb pom zoo kom muaj cov khoom sib xyaw ntawm nitrile roj hmab thiab paj rwb ntaub. Rau cov kua qaub lossis siab - qhov kub thiab txias, peb pom zoo Kevlar®- ntxiv HNBR lossis fluororubber (Viton), lossis txawm tias PEEK los tiv thaiv cov tshuaj yaig thiab siab - kub nkag.
3. Poj niam Adapter: Lub nplhaib siab siab tiv thaiv cov khoom sib khi los ntawm extruded nyob rau hauv siab.

• Lubrication foob: Nyob rau hauv lub thawv ntim cov txiv ntoo, nws ua kom lub plunger lubricant tseem nyob hauv qhov chaw ntim kom tsis txhob muaj kev sib txhuam qhuav.
• Kev Ceeb Toom: Thaum txhim kho cov khoom ntim tshiab, ua kom tawg -hauv. Siv dej huv thiab maj mam nce siab mus rau 2,000 psi hauv 2000 psi increments. Khaws txhua qib siab rau 20-30 feeb, kho lub caj pas ntim kom txog thaum ncav cuag kev ua haujlwm siab. Tsis txhob kaw lub caj pas ntim tag nrho ib zaug, vim qhov no yuav ua rau overheating thiab burnout.

Valve system los ua ke: valve lub cev thiab roj hmab

• Valve Inserts: Lawv tsim thawj kab ntawm kev tiv thaiv rau valve sealing.

1. Polyurethane: Txheem xim liab lossis xim av roj hmab, haum rau dej -raws li slurry thiab xis mas, nrog zoo heev hnav tsis kam thiab ua haujlwm kub ntawm kwv yees li 160℃F (71℃).
2. High -kub compound: daj lossis dawb roj hmab, haum rau cov roj-raws li slurry los yog acid daws ntawm qhov kub txog li 200℃F+.

• Caij nplooj ntoos hlav: Stainless hlau springs yuav tsum tau siv los tiv thaiv corrosion thiab tawg. Nco ntsoov lub installation ntawm conical caij nplooj ntoos hlav rau 5 "thiab 6" lub taub hau twj tso kua mis: lub me kawg yuav tsum fim lub plunger. Txwv tsis pub, lub valve yuav tsis qhib tag nrho.

Pom zoo Spare Parts List (RSPL)

Txhawm rau tswj cov xwm txheej kub ntxhov hauv thaj chaw deb, peb xav kom cov neeg siv khoom ib txwm nqa cov khoom siv khoom seem tseem ceeb hauv qab no:

1. Cov khoom siv hluav taws xob kawg: suav nrog ua tiav ntawm Vane roj hmab, Vane caij nplooj ntoos hlav, ntim khoom, O- nplhaib thiab Vane npog sealing ncoo.
2. Cov khoom seem yog cov khoom seem ntawm lub cev valve thiab lub rooj zaum valve, thiab ib lub plunger seem.
3. Cov khoom siv fais fab tu tsev: Schroeder lim cartridge, gearbox npog gasket, thiab cab cab roj foob.

Part Number Index (Piv txwv)

Txhawm rau pab cov neeg siv khoom nrhiav qhov chaw, peb sau cov lej siv rau qee qhov siab - zaus thiab hnav- cov khoom siv hauv qab no:

• 4.5 "Varnish roj hmab (tus qauv polyurethane): Txoj Cai No.316.22049
• 4.5" Verge (conical): Txoj Cai No.316.22047
• Schroeder lim cartridge: SAP No.100021412 (K-25)
• Lub hwj chim kawg loj npog foob: SAP No.100002810

Cim npe nrov: Halliburton ht-400 twj tso kua mis, Tuam Tshoj Halliburton ht-400 twj tso kua mis manufacturers, lwm tus neeg, Hoobkas