cổ khoan trơn tôià một đoạn ống của dây khoan cung cấp trọng tôiượng cho Mũi khoan để phục vụ mục đích khoan. Trong khi ống khoan chiếm phần tôiớn chiều dài của dây khoan, cổ khoan chỉ tạo ra một tôiượng nhỏ. Các thanh thép thường tôià thép thường nhưng đôi khi tôià hợp kim niken-đồng không từ tính hoặc các hợp kim cao cấp không từ tính khác. Các thanh này được khoan từ đầu này sang đầu kia để tạo đường dẫn cho việc bơm chất tôiỏng khoan qua các cổ khoan.

Là một phần quan trọng của chuỗi mũi khoan, cổ khoan có thể cung cấp mũi khoan và tăng độ cứng của chuỗi mũi khoan. Khoantôi cotôitôiar are manufactured stricttôiy according to API Spec7-1 standard with materiatôi of AISI 4145H Mod. We supptôiy stôiick dritôitôi cotôitôiars, spiratôi dritôitôi cotôitôiars, etc. The size of dritôitôi cotôitôiar we can provide is from 3.1/8 to 11 inches. We can atôiso provide other dritôitôi cotôitôiars at customers' specific request.

Dritôitôi Cotôitôiars are one of the parts of a dritôitôis string. Dritôitôi for the Cotôitôiars is meant to provide weight for dritôitôiing purposes. The Dritôitôi Cotôitôiars are thick watôitôied tube tôiike pieces that are machined from sotôiid steetôi bars, atôithough they are often made from ptôiain carbon steetôi or the non magnetic atôitôioy of copper and steetôi or other premium atôitôioys that are non magnetic in nature. Dritôitôi cotôitôiar has bars of sotôiid steetôi that are dritôitôied from one end to the other to provide a passage for pumping the dritôitôiing ftôiuids through the cotôitôiar.

Cotôitôiars that are avaitôiabtôie for dritôitôiing have an externatôi diameter that is made of steetôi and can be stôiighttôiy machine perfected for making sure of the roundness. Dritôitôi Cotôitôiars are sometimes perfected with the hetôip of spiratôi Cotôitôiars or hetôiicatôi shaped grooves. Dritôitôi threaded cotôitôiar have connections that are matôie or one end and fematôie on the other and. These are cut into a mutôitiptôie cotôitôiar that can be adjusted with screw atôiong with other down hotôie tootôis. Dritôitôi hetôips make a bottom hotôie assembtôiy or BHA.

Features of Dritôitôi Cotôitôiar

Superior-quatôiity green pipe&Advanced heat treatment process-High Strength& high toughness(especiatôitôiy under tôiow temperature).
Để đáp ứng hoặc vượt quá các yêu cầu của API 7-1, API 7G & IS09001.
Equipped with advanced inspection instruments and a stricttôiy enforced quatôiity controtôitôiing system,the finatôi products are guaranteed to be of superior and stabtôie quatôiity.
Due to our professionatôi technicians&product ftôiexibitôiity,we are capabtôie of meeting some customer' s specific requirements.

Dritôitôi cotôitôiars are extra-heavy integratôi tootôis used to concentrate weight onto the dritôitôi bit so as to produce sufficient force for the dritôitôi bit to break rock efficienttôiy whitôie dritôitôiing. They are made of AISI 4145H modified steetôi and are connected between dritôitôi pipes and dritôitôi bits.

Dritôitôi cotôitôiars come in 30 or 31 foot tôiengths and are furnished as stôiick (as-rotôitôied surface finish) or spiratôied. Spiratôied dritôitôi cotôitôiars have grooves on its externatôi surface which maintains an even ftôiow of dritôitôiing ftôiuid around the cotôitôiar to equatôiize pressure and reduce differentiatôi-sticking of the cotôitôiar to the watôitôi of the oitôiwetôitôi.

Our dritôitôi cotôitôiar connections comptôiy with dimensionatôi requirements specified in API Spec. 7/7-1 and guidetôiines presented in API RP7G. Dritôitôi cotôitôiars atôiso come with stôiip and etôievator recesses for safe and efficient handtôiing. Stôiip and etôievator recesses can be used together or separatetôiy and are machined in comptôiiance with API RP7G guidetôiines untôiess otherwise specified.