Demonstrated to be one of the safest and most reliable methods of sand control and wellbore support, G&L Slotco slotted liners are strong, easily installed and virtually maintenance-free.

Providing a rugged screen, they allow formation fluids to enter the wellbore with less frictional drag than the lateral wound wire of wrapped screens.

Providing a rugged screen, they allow formation fluids to enter the wellbore with less frictional drag than the lateral wound wire of wrapped screens.

G&L Slotco's leadership in the delivery of slotted liners is assured by its state-of-the-art technology. Sophisticated multi-spindle milling machines are used to manufacture slotted pipe of exceptional quality. Specially-designed, this equipment is hydraulically controlled for high precision and constant quality control.

Our slotting machines are designed to handle pipe sizes up to 12 inches in diameter and can manufacture lengths up to 46 feet at one time. This extremely rigid and stable equipment enables the pipe to be milled to precise tolerances, producing clean openings and consistent slot widths and lengths.

A unique hydraulic clamping system secures and straightens the casing without damaging the pipe or slots. Special high speed steel circular saws cut the slots. Continuous application of coolant maintains the pipe's metallurgical integrity. No excess metal is removed and maximum pipe strength is assured while staying within a specified open area.

All slotting machines are fitted with CNC indexing systems which ensures slots are placed exactly on the tubulars both radially and axially. This ensures that all specifications are achieved and maximum strength is maintained for installation.

G&L Slotco produces two styles of slot profiles - either Straight Cut or Seamed Keystone.

Straight Slots – Slots are cut with equal width through the wall of the pipe both ID and OD. Specified where sand grain bridging at the slot is not of major importance, straight slots are more wear-resistant than seamed keystone slots and are less costly to produce. Common applications of Straight cut slots are for Cold Production and CBM horizontal wells in addition to SAGD injector wells.

Seamed Keystone Slots – - are milled wider on the pipe interior and are self cleaning to help prevent plugging. Narrow at the liner surface and increasing in width at the interior, they let sand that does enter pass easily through the slots without plugging..

Slot Lengths - are precision cut at high production rates and can be matched to your precise ID AND OD specifications in lengths of 1 inch to 3 inches depending on slot width

The most common slot lengths consist of:

Unless otherwise specified, slotted liners are cut with four rows per slotted foot, with rows staggered, 50% offset of each other. Rows are staggered in order to preserve most of the pipe's original strength and integrity. Moreover, when slots are evenly distributed over the pipe surface, drainage is more efficient.

The illustrations show four typical slot patterns: (A) a 1.5" slot length in a staggered pattern, (B) a 2.25" slot length in a staggered pattern, (C) a 1.5" slot length in straight in-line pattern, and (D) a 2.0" slot length available in a gang slot pattern.

Before slotted pipe is delivered, all casings are thoroughly cleaned and deburred from the interior and exterior. G&L Slotco utilizes a combination of high pressure water with air to remove initial cuttings and oil. Specialized deburring equipment using spring steel and high pressure air remove remaining wickers and burrs from all slots. Finally the OD of the pipe is cleaned by exterior wire brushes which remove chaff and excess surface material.

A light scope is used for final inspection of the casing and a film of rust-protective inhibitor is applied to all surfaces. All threads are inspected, redoped and protectors are re installed prior to storage.