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

BERO™ biosurfactant will attach to the inner wall of the pipe, prolonging was

clearing period, improving pump efficiency and coefficient of production time

and extending workover-free period. In addition, compared with flushing fluid

composed of other components, BERO™ biosurfactant will not do harm to

reservoir and crude oil dehydration and sewage treatment systems.

Cleaning applicable to block reservoir and improvement of water

flooding efficiency

As for secondary oil recovery and tertiary oil recovery technologies, polymer

flooding and water flooding are commonly used in worldwide; however, with

the application of various methods and expansion of fields, problems are

continuously revealed. For instance, as for polymer flooding, slow dissolution,

shear degradation, thermal degradation, oxidative degradation, high salinity of

formation water and the like will result in polymer consumption. In addition, it

has been found out that due to various factors, polymer may cause new

pollution, plugging and the like in the formation close to well during polymer

flooding. Therefore, polymer flooding is restricted to different extents when

applied in the block. Comparatively speaking, water flooding is more

commonly used due to lower cost and simpler process, but water injection

wells often have the problem of under injection, thus affecting the development

effect of reservoirs. As for under-injected wells, reservoirs have poor physical

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

property, low permeability and small pore radius due to deposition and are

restricted by plugging in the late period due to substandard quality of injected

water, corrosion of injection and production system, solid particles and scaling;

therefore, it is the inevitable choice for the block, which has been developed by

adopting water injection, to improve water flooding efficiency in order to ensure

stable production of oilfields.

When used for clean treatment of reservoirs and oil displacement, BERO™

biosurfactant can effectively lower the water injection pressure of water

injection well, improve water injection profile and achieve very remarkable

plugging removal and injection reduction effect. Since BERO™ biosurfactant

has the same density with water and is completely soluble in water, it can

increase sweep area when, together with injected water, passes a water

injection well and moves towards a production well and rapidly release the

crude oil adhered to the rock in the way where it passes; meanwhile, part of

BERO™ biosurfactant is adsorbed on rock surface to lower the interfacial

tension and surface tension, changes the wettability of rock and forms new oil

outlet passages in the formation to allow released crude oil to smoothly flow to

the wellhead with water; moreover, emulsion formed through the biological

reaction of oil, water, enzyme, enzyme-based ferment is viscous, thus affecting

the original water flowing passages, forcing water flow to find more new

passages and flooding more crude oil to the bottom of production well.

In addition, BERO™ biosurfactant can protect water injection wells and the

biological mechanism of BERO™ biosurfactant enables the degradation and

restoration of sewage, pollution and organic deposits. In addition, it will not

produce other new product, so it will not plug pores or cause secondary

pollution. BERO™ biosurfactant improves the conditions of the block and

water injection wells through treatment, lowers the consumption of energy

source and machinery and effectively improves oil recovery rate, thereby

enabling reservoir cleaning, plugging agents removal and injection reduction of

waterflooding, oil displacement of the block and stimulation of production

wells.

BERO™ biosurfactant has the unique characteristic of non-activity, will not be

affected by shear degradation, temperature, pressure, acid, alkali and water

salinity, and is completely soluble in water and compatible with sewage with

any salinity. Therefore, it is commonly used for the cleaning and oil

displacement of reservoirs and has wide application scope and prospect. The

laboratory experiment on water flooding efficiency shows that the addition of

BERO™ biosurfactant into injected water can improve the rate of oil recovery

through water flooding by 5%-6% and final oil recovery rate can be improved

by about 10%.