LANDRILL Oil Tools – Your Trusted B2B Partner for Drilling Solutions

We have specialized in supplying high-quality downhole drilling tools, OCTG tubular goods, and complete oilfield equipment​ to global energy and mining clients. For two decades, our products have been consistently exported to the Netherlands, the UK, Norway, Egypt, South Africa, Canada, the USA, Singapore, Australia, and the Middle East, establishing a solid reputation for quality among international buyers.

1.Why Global Procurement Chooses LANDRILL for Casings & Couplings?

The casing string is the “spine” of the wellbore, and the Casing Coupling​ is the critical “joint” connecting every segment. Any failure in thread sealing or coupling body strength can lead to annular leakage or even well abandonment. LANDRILL never compromises on this front:

1.1 Core Advantages

Controlled Raw Materials

Casing and coupling blanks strictly comply with API 5CT specifications. Common grades include J55, K55, N80, L80, and P110, with corrosion-resistant options such as C90, T95, and 13Cr available. The chemical composition and mechanical properties of each heat are fully traceable, supported by Mill Test Certificates (MTC) and optional third-party inspection reports.

1.2 Machining Precision—Threads are Critical

Coupling internal threads are cut to API 5B precision. For STC, LTC, and BTC thread forms, post-machining inspection covers all critical parameters—taper, pitch, thread height, and load shoulder—using API standard plug/nipple gauges combined with precision measuring instruments. Premium connections featuring metal-to-metal seals are available to meet high-end application requirements.

1.3 Heat Treatment & Microstructure Stability

Heat treatment processes, including Quenching & Tempering or Normalizing, are executed with closed-loop parameter recording. Key indicators such as hardness uniformity, grain size, and impact energy are strictly controlled in accordance with PSL-2 and PSL-3 levels.

1.4 NDT & Surface Quality

The inner and outer surfaces of couplings undergo 100% Magnetic Particle Testing (MT) or Ultrasonic Testing (UT) as specified by the order. Zero laps, zero cracks, and zero scale are strictly enforced as non-negotiable quality standards. Threads are treated with phosphate coating or copper plating for corrosion resistance and friction reduction, and color coding is applied according to API grade identification (Green, Red, White, etc.).

1.5 Full-Length Traceability

A closed-loop documentation chain is archived for every shipment, linking the Heat Number to the Coupling Blank, Machining Batch Number, and Final Inspection Record, ensuring complete traceability from raw material to finished product.

We often say: “Quality is the life of a supplier; honesty makes its life longer.”​ This is not a slogan—it is the reality behind every casing shipment and every coupling’s inspection logbook.

2.Casing Drilling Technology—Combining “Drilling” & “Running Casing” into One Operation

In conventional drilling, “drilling ahead → tripping out → running casing” is a time-consuming and high-risk relay process. Casing Drilling​ uses the casing string itself to transmit torque and weight-on-bit (WOB), allowing the drill bit to rotate and advance while the casing is run simultaneously. Upon reaching TD, the casing is already in place, ready for cementing.

2.1Typical Surface / Intermediate Casing Drilling Procedure

2.1.1 Wellhead Preparation & String Assembly

The bottom-up assembly typically consists of: Drillable Drill Shoe → Float Collar → Casing Joints (BTC/STC threads) → … → Surface Casing. BTC threads provide higher connection strength and torsional capacity, ideal for large-diameter surface casing.

2.1.2 Top Drive Connection (Top Drive / Casing Drive Tool)

The top drive connects to the casing via a drive sub or slip mechanism, safely transferring rotary torque and axial load to the Bottom Hole Assembly (BHA).

2.1.3 Parameter Window Setting

Typical drilling parameters range: WOB 10–40 kN, RPM 60–120, Pump Pressure 5–7 MPa, depending on casing size, formation, and well design.

2.1.4 Rotary Drilling + Continuous Casing Running

The pilot bit/PDC cutting structure at the drill shoe breaks rock, while the reamer behind maintains hole gauge. Casing is joined and lengthened joint-by-joint as drilling progresses—the wellbore is constantly supported by casing, significantly reducing cave-in and sticking risks.

2.1.5 Bit Change (If Required)—Wireline BHA Retrieval

Unlock the locking device → Retrieve the BHA through the casing ID using a winch and wireline → Replace with a new bit → Run back in and lock → Resume drilling. Drilling fluid circulation can be maintained during retrieval/running operations.

2.1.6 TD → MWD/LWD Retrieval → Direct Cementing

Upon TD, retrieve measurement instruments. The casing is already positioned, allowing immediate cementing operations (featuring drillable float collars/shoes designed to be drilled through in subsequent sections).

2.2 Core Value Delivered by This Process

2.2.1 Shortens Well Construction Time:​ Eliminates the entire “trip out + run casing” phase, offering significant benefits for batch shallow wells/cluster wells.

2.2.2 Enhances Safety:​ Casing remains in the hole throughout, drastically reducing downhole complexities like collapse, sticking, and keyseating.

2.2.3 Cleaner Reservoir:​ Reduces repeated formation invasion caused by surge/swab pressure fluctuations during tripping.

2.2.4 Ideal for Schedule-Critical Clients:​ Geothermal wells, CBM wells, marginal field infill wells, and sidetracks/workovers in mature fields。

2.3 Applicable Fields

2.3.1 Surface Hole / Troubled Zone Isolation

In fractured zones, water zones, and unstable formations, casing drilling allows casing running and drilling to occur simultaneously, enabling rapid wellbore isolation and enhanced safety.

2.3.2 Low-Cost Geothermal Well Construction

For shallow-to-medium geothermal projects that are highly CAPEX-sensitive, casing drilling significantly compresses rig days, thereby reducing overall project costs.

2.3.3 Mature Field Infill Wells / Batch Drilling

In mature fields, schedule equates directly to production. LANDRILL supports these operations by supplying matching casings, couplings, float equipment, and providing field selection assistance.

2.3.4 CBM / Tight Sandstone Shallow Development

In high-volume, shallow-well scenarios common in CBM and tight sandstone development, the schedule compression offered by casing drilling directly translates to increased profitability.

3.More Than Just Products—We Offer a Streamlined Supply Chain 

LANDRILL does more than just “ship a batch of casings and couplings.” We excel at:

3.1 One-Stop Procurement Bundling:​ OCTG (Casing/Tubing/Couplings/Pup Joints/Blanks) + Downhole Tools (Stabilizers, Drill Collars, HWDP, Drilling Jars, Shock Absorbers, Hole Openers) + Wellhead Equipment (BOP, Christmas Trees, Manifolds) coordinated against your project list.

3.2 Expert Selection Assistance:​ Based on well depth, formation pressure, corrosive environment (H₂S / CO₂ / brine), and budget, we reverse-engineer the optimal grade combination, connection type (STC/LTC/BTC vs. premium), wall thickness, and inspection level (PSL-1/2/3), preventing over-specification or under-performance.

3.3 OEM /Custom Modifications:​ Provide drawings or existing site samples; our engineering team evaluates → modifies → prototypes → inspects → delivers.

3.4 Complete Documentation:​ MTC, Heat Treatment Reports, NDT Reports, UT/MT Reports, Dimensional Inspection Reports, and Packing Lists—meeting your internal QA and client audit requirements.

[http://www.landrilloiltools.com]​

Contact :Jessie Zhou

Mobile/Whatsapp:+0086-18109206861

Email: energy@landrilltools.com

Web:http://www.landrilloiltools.com