Drill Bit

M1953//M233 Drill Bit

Features

1. Deep blade and long parabolicconfiguration and optimized bottom hole flow fielddesign ensure the smooth movement of rock debris and resistance to bit balling.

2. Anti-whirl design improves the rate ofpenetration and enhances the stability of the drill bit.

3. Arc blade and spiral gauge helpsenhance the cutting capability and drilling stability.

4. Medium cutter density is suitablefor soft to medium stratum.

Drill Bit Parameters

M1956/M312 Drill Bit

Features

1.Deep blade and medium parabolic configuration together with optimized bottom hole flow field design ensures the smooth movement of rockdebris and anti-balling.

2.Anti-whirl design not only improves ROP but also enhances the stability of thedrill bit.

3.Medium cutter density is ideal for soft to medium stratum.

Drill Bit Parameters

Operating Procedure of the Diamond DrillBit

1. Holepreparation

Put the prior bit with a junkbasket into the well

Check the wearcondition of the previous drill bit
Make sure the hole is clean

2. Bit preparation

Transport the bit in box to the drill floor so as to avoidcutter damage

Remove the bit from the box gently and put the bit on thesteel deck covered with wood or rubber mat.

Check the bit

Record bit serial number

Check the seal ring inside the nozzle of drill bit

3. Making up the bit

Fit breaker and lock it

Clean and grease the pin
Lower the drill string to the top of pin and engage thread
Locate the bit and breaker on the rotary table and make up to recommendedtorque.

4. Tripping in the hole

Remove breaker and lower thedrilling string to let the bit slowly pass through the rotary table

Trip carefully through BOPs, casing shoes and liner hangers
Trip slowly through ledge and other tight spots
Wash last two joints to bottom with full flow at 50-60 rpm
Once reach the bottom, keep the bit 6-12 inches away from the bottom
Circulate for 5-10 minutes with full flow at 50-60 rpm
5. Reaming

Don’t ream undergauge hole

Ream tight spots with full flow to keep cutters cool

2000-4000 pounds WOB and 50-60 rpm

Ream slowly and avoid high torque

6.Bit break in

Lower the drill bit to bottom with full flow at 50-60 rpm

Compare the expected hydraulic parameters with actual ones

Record pump pressure and stroke

Drill the bottom hole with 2000-4000 pounds WOB

Break bit carefully and patiently

Add weight by 2000 pound and increase rotary speed to100-200 rpm after drilling 3 feet.

7. Drill ahead
  Determine the best drilling method byadjusting drilling parameters like WOB and rpm
 Perform drilling test regularly toachieve the maximum ROP
 PDC torque is close to that of rock bitsat equal ROP. Generally, higher speed normally results in higher torque
 If there issevere fluctuation in torque or PRM, a higher WOR or increased rpm should beadopted
 In harder stratum, rpm should be reducedto maintain stable torque and reduce the temperature of cutter. The typical rpmfor harder stratum is 80-110 rpm or lower
8. Makingconnections

After making connection, lower the drilling string with fullflow and keep rotary table at 50-60 rpm
  Measure pump stroke and pressure on andoff bottom
  Increase rpm to previous level and addweight slowly
  Don’t lower the bit too fast

9.Pulling the drill out of the hole

Slow down through tight spots, casing shoes, liner hangersand BOPs

Attach bit breaker and remove bit in rotary table

Carefully remove the drill bit to protect cutter

Do not place the bit directlyon the rotary table
Return the bit to the box after wear grading

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