Bit Selection Method Research And Application

Bit is the tool of crash rock and rate of drilling is deep related with type of bit. Inside and outside scholars make a lot of research all through which include two sides: on the one hand bit select by the parameter of rock which are obtained by log data, on the other hand bit select by results of evaluation of used bit. The first way is fit for the exploration well or the well that a lack of drilling data. The latter is fit for area that has enough drilling data. Based on practical situation of Xinjiang oil field, we develop the research of bit selection from the two sides and the practical effect is good. Those offer a method of bit selecting by quantitative analysis in xinjiang oil field for the future.In the paper, we predict the crashing parameter of rock using logging data, and set up the conversion model of P wave and S wave, set up the relation of rock bit drillability and PDC drillability, the relation of rock compressing strength, shear strength and logging data, and put forward the method of formation separation compute on rock parameter. The practice in the DongWan 1 well that is an important explore well of CNPC show that the bit selection way have good practicability. On the aspect of bit selection of using the drilling data, in the paper we research the specific energy etc which effect the capability of bit and put forward using the principal factor way to evaluate bit and select bit. After analyze the all used bit in 2001 in 8 area of XingJiang oil field, we put up the bit optimize selection series. The using effecting of 19 wells in the 8 area in 2002 show that the ROP improve 20% than the average ROP in 2001.In the paper also put forward bit selection way using nerve net and discuss the problem.