1、减少起下钻的时间。用钢丝绳起下更换钻头要比传统的用钻杆起下钻大约快

1, reducing the tripping time. Under wireline replacement than traditional drill with drill tripping about 5-10 times faster; <br>2, saving associated with the drill pipe and drill collars procurement, transportation, inspection, maintenance and replacement costs; <br>3, because the borehole always within the sleeve, there are no longer from when the pumping action of the drill pipe in the wellbore pair, so that improved well control situation; <br>4, eliminating the pumping effect and because of pressure pulsations from the drill pipe to bring; <br>5 can be maintained when using wireline drill bit continuously circulating mud, cuttings gathered prevented, but also reduces the occurrence of a kick; <br>6, improve the return velocity annulus of the wellbore and cleaning conditions. Its inner diameter larger than the drill pipe to a mud into the pump casing, reducing the hydraulic losses, the power can be reduced with the drilling rig mud pump. Return mud from the annular space between the casing and the borehole wall, since the area of the annulus is reduced to improve the return rate and improve the conditions of drill cuttings taken out; <br>7, can reduce the size of the rig, the rig structure be simplified, reduced rig costs. <br>8, drill more lightweight, easy to move and operate. And the amount of manual labor costs will decrease; <br>casing drilling technology, tools, basic Equip casing drilling process is canceled conventional drill pipe to replace the casing.

1, reduce the time to start and drill. With the wire rope to replace the drill bit than the traditional drill pipe drill about 5-10 times faster;<br>2, save the cost of procurement, transportation, inspection, maintenance and replacement related to drill pipe and drill collar;<br>3, because the wellbore always has a casing, and no longer have the drilling pipe when the pumping role in the wellbore, so that the well control situation improved;<br>4, eliminating the pumping and pressure pulsation brought about by the starting drill pipe;<br>5, with the wire rope to start the drill bit can maintain the continuous circulation of mud, to prevent the accumulation of drill chips, but also reduce the occurrence of well surge;<br>6, improved the ring air return speed and cleaning wellbore condition. When pumping mud into the casing, it reduces the hydraulic loss because its internal diameter is larger than the drill pipe, thus reducing the power of the rig mud pump. When the mud returns from the ring space between the casing and the well wall, the speed of up and down is improved due to the reduction of the ring-empty area, and the carrying condition of drill chips is improved.<br>7, can reduce the size of drilling rigs, simplify the structure of drilling rigs, reduce drilling rig costs.<br>8, drilling rig is more lightweight, easy to move and operate. The amount of labor and the cost of labor will be reduced;<br>The basic point of casing drilling process, tools, equipment casing drilling process is to cancel the conventional drill pipe, to casing instead.

1. Reduce trip time. It is about 5-10 times faster to use wire rope to trip and replace drill bit than traditional drill pipe;<br>2. Save the purchase, transportation, inspection, maintenance and replacement costs related to drill pipe and drill collar;<br>3. Because there is always a casing in the wellbore, and there is no longer the swabbing effect on the wellbore when the drill pipe is running, the well control situation is improved;<br>4. It eliminates the swabbing and pressure pulsation caused by running the drill pipe;<br>5. The continuous circulation of mud can be maintained when the bit is lifted and lowered by steel wire rope, which can prevent the accumulation of cuttings and reduce the occurrence of well kick;<br>6. It improves the return velocity of annulus and the condition of cleaning wellbore. When the mud is pumped into the casing, the internal diameter of the mud pump is larger than that of the drill pipe, which reduces the hydraulic loss and thus reduces the power of the drilling mud pump. When the mud returns from the annular space between the casing and the wellbore, the up return speed is increased and the cuttings carrying out condition is improved due to the reduction of the annular area;<br>7. It can reduce the size of the drilling machine, simplify the structure of the drilling machine and reduce the cost of the drilling machine.<br>8. The rig is lighter and easier to move and operate. Labor volume and cost will be reduced;<br>The basic point of casing drilling technology, tools and equipment is to cancel the conventional drill pipe and replace it with casing.