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| Study on impregnated teeth for bits in extremely hard rock formation of oil and
gas drilling |
| XU Liang1，2，LIU Yibo2,3，SUN Yanlong2，ZHOU Jinhui4 |
| 1Advanced Technology & Materials Co., Ltd，Beijing 100081，China; 2 Beijing Gang Yan Diamond Products
Company，Beijing 102200，China; 3Central Iron & Research Institute, Beijing 100081, China;4College of
Petroleum Engineering,China University of Petroleum-Beijing, Beijing 102249, China） |
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Abstract This paper introduces the raw material and structure design of impregnated teeth used for drilling bits in
extremely hard rock at oil and gas exploitation, and emphatically introduces the key technology of impregnated
teeth preparation, which are the Diamond "encapsulated ball" technology and HIP process treatment technology.
The influence of HIP process on the density and wear resistance of impregnated teeth is verified by indoor grinding
test and 6 inch impregnated bits are prepared and test on drilling platforms. The average drilling speed of the
impregnated bits in Grade 10 hardness granite can reach 2.7 m/h under the pressure of 6.7 t and rotary speed of
140 r/min.
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Received: 12 November 2019
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2021, Vol. 31 
