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API Oilfield Drill collar drill pipe 

Price: 500.0 USD 
Payment Terms: T/T,L/C 
Special Groups: Well drilling equipments (82)
Place of Origin: Shaanxi, China (Mainland) 
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Product Detail

Model No.: TOP-Drill collar- 11"
Production Capacity: 500 joint/month
Delivery Date: 30 days
Material: AISI 4145H
Type: Spiral
OD: 11"
Application: Well Drilling service
Means of Transport: Ocean
Packing: sea shipment
Spec.: API 7
Usage: Oil well drilling tools
Connection: IF
Processed type: Forging
Length: 31'

Drill collar As per API Spec7Material: AISI 4145H & Non-magnetic materialOD: 3-1/8"~11"
Length: 10"~31".
Type: Spiral drill collar and slick drill

Oil well drilling tools 11" Drill Collar Length 31'



TOP-Drill collar-01




AISI 4145H


Oil well drilling tools







The spiral drill collar is added to a drill collar to prevent the likelihood of differential wall-sticking by reducing wall contact between the drill collar and the wall of the hole. The box end of the spiral collar is left uncut from 79 inches from box shoulder and the pin end is left uncut 30 inches from the pin shoulder.

API relief groove pin and bore back box stress relief are available on request.

Thread roots are cold-worked to offer a greater resistance to fatigue.

All connections are phosphated to minimize galling during makeup and applied with thread storage compound.

Thread protectors are installed to ensure adequate joint protection during shipment.

Oil well drill collar

Oil well drilling API Spiral drill collar Slick drill collar

About ZZ TOP


ZZ TOP Oil Tools is the professional manufacturer for the drill stem testing tools and surface testing equipment.

All the DST tools are conformed with NACE MR 0175 with traceability,and the DST tools can be worked

in H2S & CO2 above 175 F and full H2S.

Also with the skilled and experienced engineers, we can design the drill stem testing tools as per customer's well condition. Moreover, we supply the training in our factory and operation instruction at the well site.


As the manufacturer, we produce below items:

-DST tools- Full bore retrievable packer, circulating valve, select tester valve,safety valve etc.

-Surface well testing equipment -  Flowhead, SSV, ESD,Separator etc.

-Wellhead equipment such as BOP, X-mas tree, Choke manifold, kill manifold, drilling spool, casing head and other valve & flanges

-Downhole tools such as stabilizer, stabilizer forging, reamer, X-over sub and  etc


As the distributor, we are working with large rig companies and heavy equipment manufacturers for the below products:

-Rig parts from RG,BOMCO,SJ,Hong Hua,KR etc,such as mud pump,rotary table, hook & block, swivel, crown block and consumable parts

- BOP and wellhead parts from Rongsheng,Shenkai

- Handling tools and Fishing tools

 -Downhole tools such as stabilizer, stabilizer forging, reamer, X-over sub and  etc

If you have any requirements in our scope, feel free to contact us.


Ms. Elaine
skype Ms. Elaine

Tel: 86-29-81779342
Mobile: 136 2920 7466
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Company Info

XI'AN ZZ TOP OIL TOOLS CO.,LTD [China (Mainland)]

Business Type:Manufacturer, Distributor/Wholesaler, Service
City: Xi'an
Province/State: Shaanxi
Country/Region: China (Mainland)

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zztopoiltools:   skype

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