Basic data requires for injection design 1) Drilling and completion dates, total depth, return top of cement, cement plug depth, casing size and setting depth, wall thickness, distance between casing (tubing) head and bushing, location of casing collar nearby packer sticking point, maximum well deviation and depth, commissioning (injection starting) date and cementing quality 2) Perforated horizon, perforated interval, actual perforated horizon, actual perforated interval, thickness, number of layers and perforation parameters (gun type, density, porosity, penetrability and mud content)

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
serious casing deformation and insufficient original formation energy.
It is inapplicable to gas wells.
Well selection requirements
Production wells of which production is high in the initial period and is reduced
after development
Production wells having low production and keeping normal operation
Heavy oil wells of which tubing is plugged or the inner diameter of tubing is
reduced due to wax, gum or asphalt precipitation of string during production
Production wells causing formation plugging due to gum and asphalt
Production wells of high and middle-penetrability reservoir, which should be
considered first
Production wells meeting well selection requirements (for tapping of shut-down
wells)

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
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Basic data requires for injection design
1) Drilling and completion dates, total depth, return top of cement, cement
plug depth, casing size and setting depth, wall thickness, distance
between casing (tubing) head and bushing, location of casing collar nearby
packer sticking point, maximum well deviation and depth, commissioning
(injection starting) date and cementing quality
2) Perforated horizon, perforated interval, actual perforated horizon, actual
perforated interval, thickness, number of layers and perforation
parameters (gun type, density, porosity, penetrability and mud content)
3) Production status: current daily volume of produced liquid, oil production,

3. 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
water cut, pump diameter, working parameter, pump efficiency, oil pay,
working fluid level, sand (wax) content, wellhead oil pressure, casing
pressure, total salinity, formation temperature and production status of
adjacent well of the same formation
4) Properties of crude oil: density, viscosity, freezing point, gum, asphalt and
wax content
5) Current status of down-hole string
6) Analysis of problems of well under construction in geological solution
7) Basic geological drawings: comparison diagram of small layers of reservoir,
deposition facies diagram of small layers, reservoir fence diagram,
reservoir structural diagram, well pattern diagram, etc.
Preparation for construction
1) Pretreatment of sand producing formation
Before the application of BERO™ biosurfactant, sand control treatment should
be conducted on production wells of sand producing formation.
2) Treatment of high water cut formation
As we all know, oil recovery = sweep efficiency ×oil displacement efficiency. In
order to tap the potential of medium and low-penetrability formation, it is
necessary to improve sweeping efficiency of injected water and adjust the
produced fluid profile of production well. Before the application of BERO™
biosurfactant, high-permeability layers of formation should undergo water
shut-off and profile control. Under the good cleaning effect of BERO™
biosurfactant, treated formation certainly will obtain high production with small
input.
Onsite BERO™ treatment processes