(eor/meor/bero/oil recovery) application of bero™ biosurfactant in yanchang oilfield and its...

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Application of BERO™ Biosurfactant in Yanchang Oilfield and Its Effect

China has relatively mature development and steady production technology for

middle- and high-permeability reservoirs. However, as for low-and ultra

low-permeability reservoirs, oilfield operators face the challenges of slowing

down natural depletion, realizing sustainable steady production of oil wells and

gaining high final recovery rate and economic benefit. Yanchang Oilfield is

located in Ordos Basin and the reserves of ultra low-permeability reservoirs

account for more than 50%. Since such reservoirs have high permeating

resistance and poor formation communication, they are typical complicated oil

and gas reservoirs which are mainly characterized by low porosity, low

permeability and low production and are difficult for recovery.

Application of BERO™ Biosurfactant in Yanchang Oilfield Jingbian Oil

Production Plant and Its Effect

Jingbian Oil Production Plant has been using fracturing method to improve

recovery rate for a long time, but when fracturing method is applied in ultra

low-permeability reservoirs, there is a potential problem that fracturing fluid

flows back difficultly and residual fracturing fluid in reservoir fractures will

cause fluid plugging and lower the permeability of fractures; in addition, the

residual fracturing fluid will result in clay mineral expansion and particle

migration and cause great damage to the reservoirs. Under the condition that

detailed data on Well 45054 and Well 41094 of Yanchang Oilfield Jingbian Oil

Production Plant cannot be acquired, our company only could combine the

data of adjacent wells and calculate based on actual condition and data of

adjacent wells and then applied 1.15m3 of BERO™ biosurfactant in Well

41094 and 1.05m3 of BERO™ biosurfactant in Well 45054.

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After the use of BERO™ biosurfactant, daily liquid production of Well 41094

increased from 8.2 bbls to 18.9 bbls, daily oil production increased from 2.8

BOPD to 8.6 BOPD and water increased from 5.4 BWPD to 10.3 BWPD and

total production increased by 208%.

The construction of Well 45054 was carried out under the condition that water

cut has reached 100% (which means oilfield depletion); after the use of

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BERO™ biosurfactant, daily liquid production of Well 45054 increased from

3.7 bbls to 25.2 bbls, daily oil production increased from 0 BOPD to 8.6 BOPD

and water increased from 3.7 BWPD to 16.6 BWPD, thus enable this well to

bounce back. Through one year’s development, the daily liquid production of

this well maintained at 21.6 bbls, water 13 bbls and oil production 8.6 bbls,

indicating that this well maintained at high production stimulation level.

As of July 2007, the crude oil production of these two wells has increased by

5184 bbls on a cumulative basis.

Application of BERO™ Biosurfactant in Yanchang Oilfield Zhiluo Oil

Production Plant and Its Effect

Hu 85, Hu 86 Cong 3, Zhang 228 Cong 2 and Zhang 279 Cong 1 wells of

Yanchang Oilfield Zhiluo Oil Production,analysis result shows that these wells

have sufficient formation energy and production reduction of these wellsare

mainly caused by high wax content of polymers and crude oil and the plugging

of near-wellbore area caused by well flushing conducted recently. BERO™

biosurfactant is characterized in that it has strong ability in releasing

hydrocarbon (oil) on all solid surfaces, is a non-acidizing plugging removal

agent and will not cause secondary contamination to the formation and or

disturb crude oil dehydration and sewage treatment system, so it is used for

full plugging removal according to the production need and the requirements of

geological solution of Hu 85, Hu 86 Cong 3, Zhang 228 Cong 2 and Zhang 279

Cong 1 wells of Yanchang Oilfield Zhiluo Oil Production Plant.

In September 2012, our company conducted plugging removal tests by using

BERO™ biosurfactant on these wells, effectively removed the organic plug of

test wells and restored the oil flowing channels of production wells. The

treatment result is as follows:

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As for Well Hu 85, the analysis result shows that the main reason for

production reduction is the plugging of the near-wellbore zone caused by

organic matters such as wax and asphalt contained in crude oil. In September

2012, BERO™ biosurfactant was mixed with formation water and injected in

Well Hu 85 to remove plugging and stimulate production and the temperature

of the injection fluid was above 122℉. During construction, pressure rose from

0 psi to 1450 psi.

After shut-in for 5 days, Well Hu 85 resumed production and then its

production greatly increased. Its daily oil production increased from 0.9 BOPD

to 4.3 BOPD.

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As for Well Hu 86 Cong 3, the analysis result shows that the main reason for

production reduction is the plugging of the near-wellbore zone caused by



Well Hu 86 Cong 3 to remove plugging and stimulate production and the

temperature of the injection fluid was above 122℉. During construction,

pressure rose from 0 psi to 1450 psi.

After shut-in for 5 days, Well Hu 86 Cong 3 resumed production and then its

production greatly increased. Its daily oil production increased from 1.9 BOPD

to 5.8 BOPD.

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As for Well Zhang 228 Cong 2, the analysis result shows that the main reason

for production reduction is the plugging of the near-wellbore zone caused by



Well Zhang 228 Cong 2 to remove plugging and stimulate production and the



After shut-in for 5 days, Well Zhang 228 Cong 2 resumed production and then

its production greatly increased. Its daily oil production increased from 3.1

BOPD to 10.8 BOPD.

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As for Well Zhang 279 Cong 1, the analysis result shows that the main reason

for production reduction is the plugging of the near-wellbore zone caused by



Well Zhang 279 Cong 1 to remove plugging and stimulate production and the



After shut-in for 5 days, Well Zhang 279 Cong 1 resumed production and then

its production greatly increased. Its daily oil production increased from 11.7

BOPD to 17.4 BOPD.

(eor/meor/bero/oil recovery) application of bero™ biosurfactant in yanchang oilfield and its...

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