PHD PQ ZT950 steel wireline core drill pipe rod, specification 114.5*6.6mm

PHD (PQ) rope drill pipe is the core tool for core sampling drilling in geological exploration. It is used to connect the drilling rig with the diamond drill bit, transmitting torque, drilling pressure, and providing a passage for the inner pipe assembly. Compared with global mainstream products, the drill pipe body specifications are 114.5*6.6mm, suitable for deep-hole drilling up to 2000m. It is widely used in geological exploration, engineering geological investigation, deep mining drilling, mineral exploration, etc.

Pipe body: High-strength ZT950 seamless steel pipe, overall quenching and tempering, straightness ≤ 1mm/m, high coaxiality, strong bending and torsion resistance.

Thread: Thread quenched and tempered, anti-sticking, wear-resistant, easy to tighten and loosen.

Joint: Self-connecting overall structure, no welding, high strength, good stability.

Matching tools: PQ diamond drill bit, inner pipe assembly, fishing tool, internal chamber of the winch, puller, etc

Super large bore, high core extraction rate: Equipped with PQ inner pipe, core diameter 85 mm, core extraction rate in hard/weak formations ≥ 95%, providing more complete geological information.

Deep hole heavy load, high strength: Tensile/ torsional strength is 30%+ higher than HQ, capable of stably withstanding 3000-meter deep hole load, resistant to fatigue and deformation.

Rope core extraction, efficient and time-saving: No need to lift the drill string, only retrieve the inner pipe to extract the core, drilling time reduced by 70%, significantly improving the efficiency of continuous deep hole operations.

Wear-resistant and anti-sticking, long service life: Design with low thread hardness difference + surface hardening, reducing wear and sticking, lifespan increased by 40%+, and lowering replacement costs.

Universal compatibility, strong adaptability: Compliant with DCDMA standards, compatible with PQ drill bits, expanders, inner pipe assemblies, and fishing tools; compatible with XY-6, CSK-2000 and other deep hole drilling machines, no need for modification.

Stable bore wall, reduces accidents: Strong rigidity, less disturbance, suppressing drill hole deviation; reducing the number of drill lifts, lowering the risks of collapse, sticking and burying.

Deep metal/non-metal mineral exploration (1500–3000 meters), geothermal resource drilling, scientific deep-hole drilling, geological surveys for large-scale water conservancy/transportation/infrastructure projects, geological research and sampling requiring large-diameter cores.

PQ drill pipe (1.5 m / 3.0 m)

PQ rope core retrieval assembly (single action / vibration reduction / communication)

PQ diamond drill bit, reamer

PQ fishing tool, drop-and-lift tool

1.Always use thread lubricant: It can reduce surface wear during the threading and disassembly process, metal powder fills the contact area between the threads, improving the sealing performance of the drill rod and enhancing the connection rigidity of the threads.

2. Check for wear: When the outer diameter of the joint or the pipe body wears more than 1mm (for the QA series, it is 1.5mm), replacement is necessary.

3. Prevent thread deformation: Use wrench for threading and disassembly of the drill rod to avoid using a sledgehammer to strike; it is necessary to straighten the drill rod and gently interlock to prevent thread damage and avoid causing sticking or leakage.

4. Avoid oversize construction: During construction, strictly follow the process gradation.

5. Do not use for hole opening: When using drill rod to open a hole.

6. Choose the appropriate drilling pressure: Prevent the drill rod from bending and deforming due to excessive drilling pressure.

Q1: For 3000-meter ultra-deep hole drilling with frequent complete column lifting, the process is cumbersome and the construction period is long. How can PQ drill rods be improved?
A: The rope core extraction technology can be adopted, which does not require pulling out the entire set of drill rods. Only the inner pipe can be extracted using a fishing tool to complete the core extraction. The auxiliary working time for pulling up and down the drill rods is reduced by more than 70%, significantly improving the efficiency of continuous operation in ultra-deep holes.

Q2: Under ultra-deep hole working conditions, repeatedly unscrewing and disassembling the drill rod threads, the labor intensity is high and the time consumed is long. Can this product be optimized?
A: The DCDMA standard 1:22 conical thread is used, with precise alignment and smooth unscrewing. The core extraction operation can be completed without disassembling the drill rod column, greatly reducing the frequency of thread disassembly and simplifying on-site operations, thereby reducing labor costs.

Q3: The ultra-deep hole strata are complex, with fractured and weak rock layers. The large-diameter core is prone to being washed away and damaged. What should be done if the core extraction rate does not meet the standard?
A: A large-sized core extraction inner pipe is adapted, which can quickly wrap and seal the core, effectively resisting the impact of flushing fluid and debris falling from the hole wall. The core take rate in regular working conditions can reach over 95%, ensuring the complete sampling of large-diameter cores.

Q4: During the drilling process, if the core is blocked, the traditional method requires the entire column to be lifted for processing. This seriously delays the progress. How can this drill rod handle the core blockage problem?
A: The drill rod has a reasonable inner diameter design, combined with a dedicated fishing tool, the core blockage problem can be quickly handled without fully lifting the entire column. This shortens the drill stop time and ensures the continuity of drilling.

Q5: In 1500–3000-meter ultra-deep holes, the load is large, and the ordinary drill rods have insufficient rigidity and strength, which are prone to bending, deformation, and even fracture?
A: 4130/30CrMnSiA high-strength alloy pipe material is used, which undergoes overall quenching treatment. The wall thickness is large and the overall rigidity is strong. The tensile and torsion performance is superior to the HQ specification, capable of stably bearing the load of 3000-meter ultra-deep hole operations, effectively avoiding the risks of rod deformation and fracture.