Press Release 14th February 2001

Cleansorb License with International Well Services Company

For Immediate Release:

Guildford, United Kingdom, February 14^th 2001.  

Cleansorb Ltd is pleased to announce the signing of an agreement licensing  Cleansorb’s  patented in-situ acidising technology for use by  Halliburton  on a worldwide basis.  

The technology has been successfully applied to the clean up of water based  and oil based drilling mud damage in oil production wells to improve production rates.  The process can also be used in gas production wells and water injection wells.  The latest development of the technology involves combining in-situ acidising with in-situ polymer breaking.  This provides a unique, one step treatment for high efficiency drilling mud cake clean up in existing and newly drilled wells.  

Halliburton  will apply the technology to the clean up of drilling mud damage and other forms of near wellbore damage in a variety of oilfield situations.  Cleansorb will provide ongoing technical support to  Halliburton  and will also continue to develop further variants of the technology which will be available to  Halliburton  through the license agreement. 

For further information contact:

Dr. Ian McKay or Dr Ralph Harris,  Cleansorb Ltd,  Surrey Technology Centre, 40 Occam Road, Surrey Research Park, Guildford, Surrey, GU2 7YG, U.K.

Notes for editors:

1. Arcasolve^TM has been developed by Cleansorb Limited, based at the Surrey Research Park in Guildford, Surrey, UK. The process combines enzymes (biological catalysts) with suitable chemicals to generate organic acid at a controlled rate in the fluid injected into the wellbore or formation.  The bulk of the acid is produced after placement of the fluid, permitting the efficient and even delivery of acid to the target zones maximizing the production rate of the well and its value to the operator. Arcasolve^TM is environmentally friendly and very low hazard.  Conventional acids are hazardous in use and generally require the use of toxic corrosion inhibitors.       

2. A catalyst is a compound which promotes a chemical reaction without itself being consumed.  The catalyst used in the Arcasolve^TM process is an enzyme.  Enzymes are chemical compounds found in nature.  They are however single chemical compounds which can be manufactured to the usual standards of purity of industrial chemicals. 

3. Although Arcasolve ^TM is a biotechnological process it should be clearly distinguished from previous stimulation processes based on bacteria.  Using enzymes confers many advantages including a high level of process control, high yield and better thermotolerance.  Enzyme based systems are also particulate free. 

4. Arcasolve^TM  has been granted Millennium Products status by the UK Design Council.  This means that it has been independently recognized as an innovative product which will change working practices in the 21st century. 

5. Cleansorb Limited, based at the Surrey Research Park, Guildford, Surrey, UK, is a privately owned biotechnology company which specializes in developing enzyme-based processes which assist oil and gas production. Contact:  Ian McKay or Ralph Harris, Tel. ++44 (0) 1483 295090 ; Fax. ++44 (0) 1483 845358.

6. In addition to Arcasolve^TM, Cleansorb has other award winning enzyme-based processes under development which allow the controlled deposition of gels, minerals or resins in underground reservoirs.  These have a number of applications in oil and gas production. 

© Cleansorb Limited 2006.  All rights reserved.