As if the mud is the blood of drilling, mud pump is the heart of drilling equipment, and the cylinder liner, piston, piston and the valve seat is the heart of mud pump.As a result, the service life of cylinder liner directly affects the drilling efficiency and drilling cost and the labor intensity of workers.In general, drilling deep Wells and ultra deep well integrated day rates are higher, repairing the pump can cause great economic loss.Especially the offshore drilling, drilling ship (platform) integrated day rate higher, about within 20 - $700000 a day, on average, repairing the pump 1 hour delay about loss of $18800, to this end, scientific workers and equipment manufacturers to one thousand ways to improve and improve the life of the mud pump cylinder liner.
Mud pump initially used are generally single metal cylinder liner, according to statistics, the average life expectancy for dozens of hours to about 200 hours;Then improve the service life for bimetal liner has improved greatly, the average life expectancy is around 300-500 hours.In recent years, however, the newly developed ceramic liner has a major breakthrough in life again.For example, my company independent research and has won the national patent of drilling mud pump ceramic liner product, the service life of the ceramic liner general under the same condition has reached or exceed the double metal liner 6-10 times.This patented ceramic liner already completed field tests, has been sold to the Great Wall drilling, the bohai sea, kei igawa, baoji petroleum drilling machine and drilling units and countries such as India and Russia.
 
First, the characteristics of the ceramic cylinder liner and the ceramic plunger:
1, corrosion resistance, acid and alkali resistance, high temperature, can satisfy the drilling mud or other highly corrosive liquid medium.
2, high hardness, good wear resistance, can resist all sorts of sharp or abrasive is strong in the high pressure mud solid phase particles of grinding or flushing, such as cuttings, quartz sand, iron ore, iron filings, etc.
3, ceramic microstructure uniformity, high surface finish, to improve the life of the piston.
4, ceramic cylinder pressure is high, more than 52 mpa (7500 psi), can meet the needs of drilling deep Wells and ultra deep Wells.
Second, the cylinder liner and the ceramic plunger materials and its performance indicators:
Ceramic cylinder liner and the ceramic plunger to zirconia composite ceramic formula, through high pressure forming, sintering and finish machining processes made into finished products, including the composition of the zirconia as follows: 5.4% of yttrium oxide and 94.6% zirconium oxide, the average particle size is less than 0.5 microns.Zirconia is the function of high fracture toughness, can improve the fatigue strength of the finished product, but pure zirconia products in 100-250 degrees Celsius humid conditions for long-term use will appear on the surface of "powder" phenomenon, its abrasion performance and mechanical performance fell sharply, the service life of the product is limited;Composition of 99.9% alumina, the average particle size is less than 0.5 microns, the hardness, products but the fracture toughness is low, wear-resisting products are prone to cracking phenomenon.After the combination, through precise process control, realize the complementary advantages, which can overcome the zirconia "powder" phenomenon, and can overcome the shortcoming of low fracture toughness of alumina.At the same time, through a large number of experimental results it is concluded that the content of zirconia in between 80-90%, use the best effect, can be a very good to meet customer needs.Choosing ultrafine powder compact clean burning, reason is to promote products to achieve high degree of finish product.