Geo Drill Pipe

Designed and engineered for challenging geothermal applications


Harsh conditions in geothermal drilling applications require advanced drilling tubulars. As the world leader in premium drill stem products, we offer innovative drilling solutions for the most challenging Geothermal Drilling applications. Our custom engineered products include drill pipe, heavy weight drill pipe, drill collars and accessories. We have advanced R&D and fully integrated manufacturing with facilities in the United States, Mexico, China and the Singapore.

GP GEO™ drill pipe provides superior technical performance and service life, exceeding current industry standards.

Our products include:

  • Proprietary upset designs to ensure stronger than the pipe weld strength in tension
  • Connections designed with minimized outside diameters (OD) and maximized inside diameters (ID) to allow largest possible pipe sizes in a given hole size.
  • An array of high-performance connections providing extended torque capabilities and reducing the chance of twist-offs.
  • Sour service grades to allow for safer drilling in environments that have H2S present.
  • Thick and robust tubes (95% Remaining Body Wall minimum) to maximize buckling resistance and allow for more tube wear, prolonging service life.
  • Tuboscope TK™ coatings have historically been used for general corrosion and abrasion protection of tubular assets in oil and gas as well as geothermal applications. To compliment the traditional TK family of drill string products, TK-340TC has been developed to provide thermal insulation in addition to the traditional corrosion and abrasion properties. This technology allows for greater protection of the drill string ID while also, and most importantly, protecting necessary downhole electronic systems from damage and subsequent replacement. Heavier walled drill pipe to enhance service life in cases when temperatures exceed internal plastic coating capabilities and will be exposed to corrosive chemicals.

SmoothEdge™ tool joints and hardbanding solutions prolong asset life

To help protect your pipe from excessive wear during running and extend the service life of your tool joints, hardbanding can be applied on the tool joint box section, box taper or tool joint pin section.

Our SmoothEdge tool joints provide a proprietary sacrificial wear pad added to the outer pin and box for the installation of more prominent hardbanding.

Selecting the right Geo drill pipe configuration for your project

Standard API connections have limitations in terms of torque capacity and service life, especially in highly deviated drilling in hot environment. When this occurs, drillers turn to double shoulder connections that offer higher torque as well as improved operating service life. The GP GEO product line offers a full gamut of double shoulder connections, some with thread designs compatible with standard API connections, providing full interchangeability with API drill pipe and accessories.


Grant Prideco Geo Drill Pipe Configurations

The following table shows the most representative configurations utilized for Geo drill pipe. For performance values or further product descriptions, please contact your local Grant Prideco Sales representative.
Nominal size, weight and grade Connection Tool joint OD (in.) Tool joint ID (in.) Max MUT (ft-lb) Tensile capacity (lb)
3½ in. 15.5 ppf (0.449 in.) S-135 NC-38 5 2⅛ 15,900 451,100
3½ in. 15.5 ppf (0.449 in.) S-135 GPDS™ 38 5 2 716 17,400 451,100
4 in. 15.7 ppf (0.380 in.) S-135 Delta™ 391 4⅞ 2 1116 21,400 456,900
4½ in. 20.0 ppf (0.430 in.) S-135 Delta™ 425 5⅜ 3 30,300 482,800
5 in. 25.6 ppf (0.500 in.) S-135 NC-50 6⅝ 38,000 746,400
5 in. 25.6 ppf (0.500 in.) S-135 GPDS™ 50 6⅝ 43,000 746,400
5 in. 25.6 ppf (0.500 in.) S-135 Delta™ 471 5⅞ 37,900 746,400
5 in. 25.6 ppf (0.500 in.) S-135 Delta™ 527 55,400 746,400
5 in. 25.6 ppf (0.500 in.) S-135 Delta™ 544 6⅝ 3⅝ 58,300 746,400
5½ in. 24.7 ppf (0.415 in.) S-135 5½ Full Hole (FH) 7 4 33,400 704,300
5½ in. 24.7 ppf (0.415 in.) S-135 Delta™ 544 6⅝ 4 50,300 704,300

  • Grant Prideco GEO Drill Pipe Flyer

Related Products

TCS Hardbanding

Tuboscope’s TCS hardbanding provides industry-leading tool joint and casing protection.

Learn more

Tuboscope Machining Services

The latest CNC machinery and API trained technicians with certified inspections and gauging practices set Tuboscope apart from standard machine shops.

Learn more

Drill Pipe

Built for durability and performance by the industry's leading drill pipe manufacturer

Learn more

Drill Pipe Inspection

Critical inspections for challenging drilling environments

Learn more

Running and Handling for Drill Stem Products

Best practices for running and handling to properly care for and maintain your Grant Prideco drill stem products

Learn more

Grant Prideco Licensee Network

Supporting our customers is our highest priority. Our expansive network of licensed repair facilities provides global service and support for Grant Prideco products.

Learn more

Grant Prideco Technical Resources

Supporting our customers is our highest priority, and we look forward to partnering with you today and every day to achieve lasting success.

Learn more

Related Tools

Man on in a drilling cabin points to a screen

Grant Prideco Licensee Locator

Our licensed repair facilities provide 24/7 service and technical support around the globe for Grant Prideco products to ensure quality and availability.

Learn more