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1. Water Shutoff and Profile Control Technology
Chemical Water Shutoff Technique with Inorganic Nano materials
High Strength By-pass Channeling Plugging Technique
Flexible Particle Profile Control Technique
Nitrogen-foaming Profile Control Technique
I
II
III
IV

2. I. Chemical Water Shutoff Technique with Inorganic Nano materials
(1) Technical Demands
To solve technical problems of chemical water plugging in the
conventional oil-water wells and complex wells.
(2) Scope of Application
Before and after contrast in plugging
agent bulk solution
Water drainage changes after
plugging agent solidifying
• Water shutoff and casing leakage plugging in conventional oil-
water wells
• Water shutoff in oil-well reuse after plugging of high water-
bearing layers
• Water shutoff in injecting-well reuse after plugging high hydro-
absorptivity formations
• Phased water shutoff for simplifying the strings needed in the
multi-staged separate injection and separate producing wells
• Water shutoff in heavy oil thermal recovery depletion wells and
low temperature wells
• Water shutoff in the complex wells like high-temperature wells,
high-salinity wells, ultra-deep wells and horizontal wells

3. (3) Technical advantages
• High temperature resistance, high pressure resistance
and high salinity resistance, long pumping time, low
operation risk;
• Good rheological behavior, little water drainage, no
shrinking, microstructure compacting and high plugging
rate
• High strength and high solubility, achieved unity of high
strength and high solubility
• Nice flushing resistance, long valid period
S/N Patent name Patent No.
1
High-strength and easy- soluable
nano water plugging agent
ZL20041004258.1
I. Chemical Water Shutoff Technique with Inorganic Nano materials

4. (4) Technical Specifications
S/N Index Items Index value
1 Breakthrough pressure 0.8-1.71 MPa/cm
2 Plugging rate ≥99.9%
3 Un-plugging rate ≥96.5%
(5) Fields Application
It has been stage-used in 568 wells, average validity of 28 months, the
most to 37 months, staged oil increment to 6.9×104 T, gas increment to
8547 ×104m3, water decrement to 28×104m3 , inefficient water injection
decreased by 11×104m3.
I. Chemical Water Shutoff Technique with Inorganic Nano materials

5. II. High Strength By-pass Channeling Plugging Technique
(1) Technical Demands
To solve channeling across the casing plugging difficulties in oil and water wells
on different reservoirs.
(2) Scope of Application
• By-pass channel plugging and casing leakage plugging for high pressure
water injection wells
• By-pass channel plugging and casing leakage plugging for thermal wells
• By-pass channel plugging and casing leakage plugging for conventional wells

6. • High chemical activity, high compressive
strength and high bonding strength after
solidifying.
• Adopt flexible mesh fiber material, with good
retention of the sealant slurry and tenacity of
the curing body , high temperature tolerance to
formation environment.
• The plugging agent is with adjustable initial
sealing time according to well condition, high
pressure and high mineralization performance.
(3) Technical advantages
II. High Strength By-pass Channeling Plugging Technique

7. S/N Index items Index value
1 Breakthrough pressure ≥1.5MPa/cm
2 Plugging rate ≥99.8%
3 Water precipitation ＜1.0%
Up to now, more than 300 wells have been applied on site with 100%
efficiency , solved the plugging technical problems for conventional wells
and various complicated and difficult wells.
(4) Technical Specifications
(5) Fields Application
II. High Strength By-pass Channeling Plugging Technique

8. III. Flexible Particle Profile Control Technique
This technique is mainly used to solve the technical
problem that development effect becoming worse due to
the large channels formed by water break-through in the
reservoirs with high and ultra-high permeability.
• For profile control of water drive unit with worse
development effect due to the large channels formed by
water break-through in the reservoir.
• Profile control of polymer flooding and subsequent water
flooding development unit with worse development due
to the large channels formed by water break-through in
the reservoir. After hydro-absorptivity
Accumulation photo
(1) Technical Demands
(2) Scope of Application

9. • Good flexibility, good tensile compression performance, deformation
characteristics, strong sealing ability
• Adjustable grain size and good compatibility with layer, realizing deep
plugging and having strong adaptability
• Good stability, long period of validity.
(3) Technical advantages
III. Flexible Particle Profile Control Technique

10. （S/N） （Index items） ( Index value )
1 （Temperature - resistant） 90℃
2 （Plugging rate of indoor core） ≥90%
3 （EOR in laboratory displacement appreciation） （8.4 percentage points）
The technology has been applied in 5 well groups successively in
Gucheng oilfield, Wangji oilfield and Zhangwu oilfield, increasing
5692.36 tons of oil.
调剖施工
Comparison of profile control measures in well Gu322 group
(4) Technical Specifications
(5) Fields Application
III. Flexible Particle Profile Control Technique

11. IV. Nitrogen-foaming Profile Control Technology
Mainly to solve the problems of high oil-water
mobility ratio, strong heterogeneity and fast
water-cut rising in water-flooding development of
heavy oil in conventional exploitation.
• For wells with worse effect due to high oil-
water mobility ratio and strong heterogeneity
of heavy oil blocks in conventional
exploitation.
• For wells with edge water non uniform
fingering due to the high heterogeneity.
(1) Technical Demands
(2) Scope of Application

12. • Good stability in water, de-foaming in oil, and block off the water instead
of oil;
• Selective plugging the high permeability layer as the flow resistance is
much bigger than in low permeability layer;
• With high apparent viscosity, the high oil-water mobility ratio is
effectively reduced;
• Greatly reduce oil/water interfacial tension and raise cleaning effective.
• The number of declare national patent is 201610324359.3.
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(3) Technical advantages
IV. Nitrogen-foaming Profile Control Technology

13. (S/N) (Index items) (Index value)
1 (Foam volume) 720ml
2 (Half life period of drainage ) ＞20min
3 (Resistance factor) ＞60
4 (EOR in laboratory displacement ) ≥24.7%
So far, 5 wells have been used in trial test, respectively with 2700m3 foam
agent and 17.7×104 Nm3 nitrogen, cumulative gas/oil ratio 1:1, and , and
the total injection volume of gas and liquid up to 5400m3, the cumulative
increased oil by 1568 T, and the input/output ratio 1:3.18.
(4) Technical Specifications
(5) Fields Application
IV. Nitrogen-foaming Profile Control Technology