Long length stiff formation with strong abrasive property, poor drillabillity, low mud drilling rate, frequent downhole drilling failures and long construction cycle has restricted the exploration and exploitation of deep oil and gas reservoir.

The article analyzes general geological situation and drilling difficulties of East Sichuan Puguang Structure and concludes technical measures to enhance mechanical drilling rate, combining which with deep well safety drilling technology and mud technology, forms optimal and fast drilling technology in East Sichuan Puguang Structure.

The drilling rate in Penglaizhen formation increases dramatically,while that in Suining and Shaximiao formations increases more slowly.

A Research on Technology for Increasing Rate of Penetration in Daqing Xushen Natural Gas Field;

The rate of penetration of PDC bits relates closely to its self-sharpening property.

The analyses of the relationship between drilling parameter and rate of penetration was done,and the principle of coupled driven drilling by improving rotary speed of bit was revealed to increase bit rock-breaking energy to improve penetration rate.

At present, the drilling speed in the deep gas reservoir of Xujiahe group in West Sichuan basin is slow and the drilling period is long.

In view of raising the drilling speed of gas wells in the central part of the basin, the influence of the casing programme, hydraulic and mechanical parameters, polymer drilling fluid and well cementa- tion by direct pumping and backsqueezing, etc.

Simulation of penetration rate of air percussion drilling bit;

Experimental investigation in transmission ratio and penetration rate of cone bits;

It has long been held that the penetration rate of PDC bits is lower than roller bits during air drilling.

In view of many problems faced by drilling in the lower stratum in Xujiaweizi region, such as complex geologic structures, high grade value of rock drillability, low drilling rate, slow footage, and long drilling cycle, it is urgent to correctly predict the grade value of rock drillability which will provide powerful references for a better drilling plan in reasonable way.

Although the drilling rate is related to the structure of the bit, property of the drilling fluid, drilling parameter as well as make-up of string and so on, the theory and practice indicates that the formation factor is the main factor in affecting drilling rate, which not only affects drilling rate directly, but also restrains the influence of drilling parameter on drilling rate.

The mechanical drilling rate relates closely to drilling bit structure,drilling fluid property,drilling parameters and drilling tool constitution,but according to theory and practice formation factor is still the one that impacts the drilling rate most.