Drilling Rig Components Classification: ZJ Series DT/DBT Models

1

Drawworks

JC-40DT

42CrNiMo alloy steel (gear); 40Cr (main shaft); Q345B high-strength steel (shell)

1. Gear tooth surface pitting due to repeated medium-load transmission; 2. Bearing overheating damage caused by poor heat dissipation in high-temperature drilling environments

1. Conduct non-destructive testing (UT/MT) on gears every 6 months to detect pitting in time, and grind the tooth surface if necessary; 2. Clean the heat dissipation fins monthly, ensure the cooling fan operates normally, and use high-temperature resistant lubricating oil complying with API Spec 7K

2

Crown Block

TC225

42CrNiMoA (sheave); Q345B steel (frame)

1. Sheave groove wear caused by friction with steel wire rope under medium load; 2. Frame corrosion due to long-term exposure to drilling fluid mist

1. Check the sheave groove wear depth monthly (replace if exceeding 3mm), and use steel wire rope meeting API Spec 9A; 2. Install a protective cover, clean the frame weekly, and apply anti-corrosion coating every 6 months

3

Travelling Block

YC225

42CrNiMoA (sheave); 40Cr (axle)

1. Axle wear caused by insufficient lubrication and cyclic load; 2. Sheave edge chipping due to impact load during drilling tool lowering

1. Replenish high-pressure resistant lubricating grease every 250 operating hours; 2. Control the lowering speed of drilling tools within 0.5m/s to reduce impact, and check the sheave edge for damage weekly

4

Hook

DG225

20CrMnTi (hook body); 40Cr (pin shaft)

1. Fatigue crack of the hook neck under repeated hoisting load; 2. Pin shaft loosening and wear caused by drilling vibration

1. Strictly follow the rated load (no long-term operation exceeding 80% of the rated load) and conduct UT testing every 6 months; 2. Apply anti-loosening glue to the pin shaft nut and check tightness every shift

5

Swivel

SL225

Stainless steel (rotary joint); alloy steel (shell); nitrile rubber (seal ring)

1. Seal failure caused by high-pressure drilling fluid scouring; 2. Bearing wear due to misalignment of the rotating shaft

1. Check the seal pressure regularly, replace the seal ring if leakage occurs; 2. Calibrate the coaxiality of the rotating shaft monthly (deviation ≤ 0.05mm)

6

Rotary Table

ZP275

Alloy steel (gear); 45# steel (rotary shaft); high-strength cast iron (base)

1. Gear wear caused by uneven load during drilling tool rotation; 2. Bearing damage due to insufficient lubrication in intermittent operation

1. Control the rotation speed within the rated range, avoid sudden speed changes; 2. Check lubricating oil level and quality weekly, replenish or replace oil in time, and keep the lubrication system unobstructed

1

Drawworks

JC-50DB, JC-50D

Nickel-chromium-molybdenum alloy steel (gear); 42CrMoV (main shaft); Q690 high-strength steel (shell)

1. Gear tooth breakage caused by sudden overload during emergency hoisting; 2. Shaft surface wear due to intrusion of solid particles in lubricating oil

1. Install an overload protection device meeting API Spec 7K, calibrate quarterly; 2. Equip the lubrication system with a high-precision filter (filtration accuracy ≥ 10μm), clean the filter element every 300 operating hours

2

Crown Block

TC315

42CrNiMoA (sheave); Q345B steel (frame)

1. Sheave bearing wear caused by long-term high-frequency load; 2. Frame deformation due to improper transportation and installation

1. Replace the bearing every 1200 operating hours; 2. Use professional lifting equipment during transportation and installation, avoid collision and overload

3

Travelling Block

YC315

42CrNiMoA (sheave); 42CrMo (axle)

1. Sheave groove wear caused by high-tension steel wire rope friction; 2. Axle fatigue caused by cyclic load in deep drilling

1. Check the sheave groove wear monthly, grind if necessary; 2. Conduct fatigue testing of the axle every 800 operating hours, replace if fatigue cracks are found

4

Hook

DG315

20CrMnTiH (hook body); 40CrNiMo (pin shaft)

1. Hook mouth wear caused by long-term contact with heavy drilling tools; 2. Pin shaft corrosion due to drilling fluid immersion

1. Install a wear-resistant sleeve at the hook mouth, replace the sleeve when wear exceeds 2mm; 2. Apply anti-corrosion oil to the pin shaft monthly, clean the hook body after operation

5

Swivel

SL450-5

Duplex stainless steel (rotary joint); heat-resistant alloy steel (shell); fluororubber (seal ring)

1. Rotating joint wear due to high-speed rotation under high pressure; 2. Seal damage caused by chemical corrosion of formation fluid

1. Replenish high-pressure resistant lubricating grease every 200 operating hours; 2. Test the chemical composition of drilling fluid regularly, add corrosion inhibitors if corrosive media are present

6

Rotary Table

ZP375

Alloy steel (gear); 42CrMo (rotary shaft); high-strength cast iron (base)

1. Gear wear caused by high-torque transmission in deep drilling; 2. Base deformation due to uneven ground stress

1. Use high-torque resistant gears, check gear meshing status monthly; 2. Level the base before installation, conduct stress testing quarterly to avoid uneven stress

1

Drawworks

JC-70DB

High-temperature alloy steel (gear); 42CrMoV (main shaft); Q960 high-strength steel (shell)

1. Gear wear caused by high temperature (above 120℃) in deep well operations; 2. Shaft deformation due to combined high torque and high pressure

1. Equip with forced cooling system to keep the gear box temperature below 90℃; 2. Conduct non-destructive testing of the main shaft every 3 months to check for deformation

2

Crown Block

TC450

42CrNiMoA (sheave); Q690 steel (frame)

1. Sheave bearing failure due to high-frequency vibration in deep drilling; 2. Frame stress concentration caused by uneven load distribution

1. Use vibration-damping bearings and check the vibration amplitude weekly; 2. Optimize the load distribution structure and conduct stress testing annually

3

Travelling Block

YC450

42CrNiMoA (sheave); high-strength alloy steel (axle)

1. Severe wear of the sheave groove due to ultra-high tension steel wire rope; 2. Corrosion of the axle due to high-temperature and high-pressure drilling fluid

1. Use ultra-high wear-resistant steel wire rope and check the sheave groove wear weekly; 2. Apply high-temperature and corrosion-resistant coating to the axle and inspect monthly

4

Hook

DG450

20CrMnTiH (hook body); 40CrNiMoA (pin shaft)

1. Fatigue crack of the hook body under ultra-high load cyclic action; 2. Pin shaft wear caused by high-temperature creep

1. Strictly implement load monitoring and avoid overloading by more than 10% even in emergency; 2. Use high-temperature resistant pin shaft and replace it every 1000 operating hours

5

Swivel

SL450-5

Super duplex stainless steel (rotary joint); heat-resistant alloy steel (shell)

1. Seal failure due to high-temperature and high-pressure drilling fluid scouring; 2. Bearing wear caused by high-speed rotation under extreme conditions

1. Use high-temperature and high-pressure resistant seals and replace them every 500 operating hours; 2. Monitor the bearing temperature in real time and stop operation if it exceeds 100℃

6

Rotary Table

ZP375

High-strength alloy steel (gear); 42CrMoV (rotary shaft); high-strength cast iron (base)

1. Gear tooth surface fatigue wear caused by long-term high-torque rotation; 2. Bearing damage due to insufficient lubrication under high temperature

1. Replace gears every 2000 operating hours or when tooth wear exceeds 15%; 2. Use high-temperature resistant lubricating grease, replenish every 150 operating hours, and check lubrication status in real time