Four US Patents

1. US Patent Nbr 6.220.358 issued on April 24, 2001

Consist in using steel CT as hollow sucker rod. The inventor and owner of this
patent is Humberto (Bert) Leniek.
The first successful test took place in Argentina, and was followed with more
tests in US and Canada. This artificial lift method was tested in more than 30 interventions and proved that works having tremendous potential, particularly in North America to recover old wells by converting to Slim Holes.

Status: ready for commercial application.
See “Field of Applications”.

2. US Patent 6.585.049 issued on July 1, 2003

Consist of a DUAL displacement pump to be used either with conventional sucker rods or CT as pumping string.
The standard beam-pumping unit with conventional subsurface pump and rods lifts fluid typically in the up stroke through the annular space between tbg and rods.
This artificial lift method uses both motions of the pumping unit and allows to produce over 50% more production with the same surface installation.
In the up stroke production is lifted to surface through the annular space between tbg and CT, and in the down stroke,production reaches surface through the CT.

If used with sucker rods, fluid is produced through the annular space between tbg and rods.

Advantages:
• Can use either CT or sucker rods.
• Ideal for secondary recovery wells.
• Uses small pumping unit.
• Designed to continue to use existing beam pumping units to produce large volumes of fluid, instead of using ESP’s or even PCP’s.
• To reduce mechanical failures by pumping at a slower rate.
• To maximize the use of energy.

Status: ready for commercial application.

Consist in using COMPOSITE CT as hollow sucker rod, an alternative in highly
corrosive wells. The inventor and owner of this patent is Humberto (Bert) Leniek.

• Similar application than steel CT, but a much lighter string and greater capability to resist corrosion.
• Lighter pumping string.
• Uses small pumping unit.
• Requires less energy than pumping either with sucker rods or steel Coiled tubing.

Status: depends on composite CT availability.

4. US Patent Nbr 5.785.500 issued on July 28, 1998

Consist of an hydraulic lifting system specially designed for wells with gross production in the average of 120 bls/day of less.
The assignee of this patent is Quality Tubing Inc. and Humberto (Bert) Leniek
as inventor, was granted the rights to use this technology.

Advantages down hole:
• Minimum moving parts down hole
• CT replaces sucker rods and couplings
• CT does not move
• Lack of reciprocation and connections minimizes fishing jobs
• Good application for used CT

Advantages on surface:
• Small hydraulic power unit replaces bulky beam pumping unit
• Environmentally friendly
• Handling and maintenance does not require heavy
• equipment
• Less exposure to accidents
• Small working area around the well head
• Surface equipment easier to replac
• Low power consumption

Status: Pending more tests.