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Sichuan petroleum administration bureau in dth button bits 1985 in China and the United States Christensen (Eastman Christensen) joint venture set up sichuan stone a Christensen diamond rock drilling tools company. Xinjiang petroleum administration bureau in 1994 established a joint venture with Halliburtos secarity DBS company xinjiang one pursuit, ace rock drilling tools company, the two companies are using the foreign mature PDC rock drilling tools manufacturing technology, effectively promote the manufacture and application of PDC rock drilling tools in China advances in technology, promotes the PDC rock drilling tools in the promotion and popularization of major oil fields in our dth drill bits country. In PDC production technology is not yet mature, or PDC rock drilling tools just before you start developing a period of time, there are manufacturers in cemented carbide substrate of polycrystalline artificial diamond replace natural larger particles to create table with rock drilling tools. Poly crystal shape has one end is tapered cylindrical, triangle block shape, round shape and rectangle, block, etc, such as GE Geoset, Fomset, De Beers company Syndax3 and zhengzhou three grinding of TSP, their common characteristic is has high heat stability, resistance to high temperature of 1000 ℃ ~ 1100 ℃, namely direct sintering to composed of tungsten carbide powder fail to bond metal crown of rock drilling tools, tire body as drill tooth, crushing and cutting formation.


Zhengzhou from 1969 to 1975 in three grinding respectively produced by several different diameter JR20SN - 2 crystals, first used to gauge the impregnated rock drilling tools and reamer manufacturing, drilling formation of mine below level 7, and then made oil scraper with 6 x6 mm poly crystalline rock drilling tools, test in shengli oilfield, got into the same hole depth of 2400 m, for example, polycrystalline blades rock drilling tools and cemented carbide blade, compared to rock drilling tools can save 1.1 ~ 12000 yuan per well, and save 78% of the time; Polycrystalline scraper compared with cone rock drilling tools, rock drilling tools cost savings by more than 50%, reduced drilling time of 5 ~ 8 days. Another 1.8 x 5 mm poly crystal manufacturing geological coring rock drilling tools, reamer, and 2.5 x 5 mm poly crystal used in metallurgy, coal and geological impregnated rock drilling tools, gauge, its effect is similar to natural diamond.


In the early 1980 s before our country independent overburden drilling systems research and development of PDC successfully, 6 x6 mm poly crystal has a large number of used in oil and gas drilling core rock drilling tools and watermelon skin type comprehensive drilling rock drilling tools. Triangle block polycrystalline also has a large number of used in the manufacture of medium hard to hard formations, such as limestone, dolomite, drilling core or full in mild abrasive rock drilling tools. Domestic PDC mass production since the 90 s, after gradually out of the polycrystalline for synthetic diamond drilling market, replaced by the PDC comprehensively. Oil and gas well drilling with PDC the development and application of rock drilling tools, experienced a quite a long time, early PDC impact resistance is not high, the existence of stratification, combined with rock drilling tool design and manufacturing problems and oil and gas drilling has risks, occupy a larger share of the drilling market cone rock drilling tools manufacturer performance is not so positive, so research and development and application of PDC rock drilling tools encountered greater difficulties and resistance.