(EOR/MEOR/BERO/oil recovery) According to the effect and characteristics of BERO™ biosurfactant and the production need and geological solution of Well Wu 11-7 of Qinghai Oilfield, we carried out the plug removal of this well by using BERO™ biosurfactant in March 2006 and then this well was shut in for 5 days; its daily oil production reached 50.4 BOPD within 7 days after this well resumed production, maintained at about 8.6 BOPD from April 2006 to January 2007 and reached 2.2 BOPD from January 2007 to April 2007. So far, oil production increases by about 2,779 bbls (1608%) on a cumulative basis.

1. www.zfatech.com
UNITED STATES
Add: 12212 Ashling Dr Stafford, TX, 77477
Tel: +1713 893 4784
CHINA
Add:Nanopolis Suzhou: NW02, Room 110,
99 JinjiLake Avenue,Jiangsu Province, P.R. China.
Zip: 215123
Tel: +86 512-6999 5236 Fax: +86 512-6999 5237
E-mail: contact@zfatech.com
Application of BERO™ Biosurfactant in Qinghai Oilfield and Its Effect
In the first half year of 2006, BERO™ biosurfactant produced by the Company
was applied in oil wells of Wunan Block of Qinghai Oilfield; Well Wu 11-7 of
Qinghai Oilfield was perforated and put into production in December 1997, and
developed through pumping, with daily oil production of 61.2 BOPD and 8
BWPD; in August 1999, acidizing plugging removal was conducted on this well
and the oil production and water of this well were 6.5 BOPD and 1.1 BWPD
respectively before plugging removal and 9 BOPD and 3 BWPD respectively
after plugging removal; and oil production increased by 605 bbls in total. In
May 2000, the cumulative oil production increase reached 338 bbls after
re-perforating; re-perforating conducted in 2002 and 2004 had no effect on
stimulation, this well was under the condition of pumping suspension and
dragging oil for a long time and by March 2006, about 14.4 bbls/month oil (with
a water cut of 85%) has been dragged from this well.
According to the effect and characteristics of BERO™ biosurfactant and the
production need and geological solution of Well Wu 11-7 of Qinghai Oilfield, we
carried out the plug removal of this well by using BERO™ biosurfactant in
March 2006 and then this well was shut in for 5 days; its daily oil production
reached 50.4 BOPD within 7 days after this well resumed production,
maintained at about 8.6 BOPD from April 2006 to January 2007 and reached
2.2 BOPD from January 2007 to April 2007. So far, oil production increases by
about 2,779 bbls (1608%) on a cumulative basis.
The effect of BERO™ biosurfactant on improvement of recovery rate provides
new thinking and method for the development of Wunan Block of Qinghai
Oilfield with high water and velocity sensitivity and lays a foundation for the
production of this oilfield.
The following information and data are provided by Wunan Block of Qinghai
Oilfield No.2 Oil Production Plant.
Operation of Well Wu 11-7 using BERO™ biosurfactant was conducted from
March 17, 2006 to March 28, 2006.
Comprehensive Card Data Table of Well Wu 11-7 (from March 2006 to
September 2006)

2. www.zfatech.com
UNITED STATES
Add: 12212 Ashling Dr Stafford, TX, 77477
Tel: +1713 893 4784
CHINA
Add:Nanopolis Suzhou: NW02, Room 110,
99 JinjiLake Avenue,Jiangsu Province, P.R. China.
Zip: 215123
Tel: +86 512-6999 5236 Fax: +86 512-6999 5237
E-mail: contact@zfatech.com
The monthly oil production of Well Wu 11-7 reached about 14.4 bbls before the
use of BERO™ biosurfactant and after the use of BERO™ biosurfactant from
March 17, 2006 to March 28, 2006, the liquid production of this well obviously
increased and overall water cut thereof declined slightly. It is proved that
BERO™ biosurfactant is effective. Oil production started to decrease after
slight fluctuation by the end of June and decreased to 83.3 bbls in September
and liquid production and water cut changed before and after the use of
BERO™ biosurfactant. Average daily oil production change chart should be
drawn according to the data.