Application of ultra-short radius radial wells drilling technology in wei-5 well

With the aim to increase oil output and perfect the technical measure of reaming and drilling,ultra-short radius radial wells drilling in wei5 well.Single-axis roller telescoping underreamer was developed which worked effectively and overcame drill stem wobbling and vibrating.At the same time,due to structure improvements of steering device and fluid jet drilling bit and drilling fluid etc,three ultra-short radius radial horizontal lateral wells at the identical depth of 1065 m in well Wei5 were successfully drilled in 4 days with no trip-out of the wipstock for the first time.In the well drilling, three new technical records in the USRRW application in China were set including the most lateral holes drilled in one well,the greatest out-reach of one radial horizontal hole and the shortest operation time.The successful drilling in well Wei5 showed a great step of the USRRW drilling has marched toward maturing and potential application in China.