The document describes a multi-unit plugging removal technique called HGSC. It works by heating, dissolution, and chemical reaction mechanisms to remove organic deposits in wells. The technique involves injecting a heated chemical solution to warm the wellbore, dissolve deposits, and prevent scaling through chelation. It has been applied to over 20 wells in China, increasing oil production and cumulative gains in all cases. The technique is simple, safe, and can be adjusted based on reservoir conditions.

1. H G S C
M u l t i u n i t P l u g g i n g R e m o v a l T e c h n i q u e
PT COSL INDO
2016.10

2. 2. Process
3. Applications
1. Introduction

3. Introduction——Background
Viscosity Increasing
Changing of Press. & Temp.
Organism Depositing
Cold Damage
Properties of Fluid Scaling
Liquid-supplying Insufficiency
Production Decline
……

4. Introduction——Background
GAS
Energy- increasing
SOLVATION
Penetrating & Cleaning
CHELATION
Anti-scale
HEAT
Chemical-Reacting
HGSC Technique：Heating+Dissolution+Mechanism

5. Introduction——Theory
HEAT
 Warming wellbore and layers
 To cause organic sediment to flow
A + B + C Salt+ Gas + Heat
-E/
0
/ e
n T m
a
dC dt k C C


6. Introduction——Theory
SOLVATION
Chemical Material Corrosion Rate（g/m2
·h）
YG-A
J55 0.89
Cable plastic core
（Cuprum contained）
0.16
N80 0.039
YG-B
J55 0.6
Cable plastic core
（Cuprum contained）
0.16
N80 0.09
YG-C
J55 0.11
Cable plastic core
（Cuprum contained）
0.06
N80 0.02
MIX
J55 0.46
Cable plastic core
（Cuprum contained）
0.11
N80 0.02
CLEANNING
 Penetrating into layers
 Washing oil efficiently

7. Introduction——Theory
7
CaCO3 Ca2+ + CO3
2-
Ca2+
CO3
2-
Slightly soluble、
ionizing
Chelating
dissovling
+
CHELATION
 Destructing ionization
balance of scale to cause
its solvation in water

8. Introduction——Properties of HGSC syst.
Dissolution
Corrosion
Energy
Gas
Heating 7t water to 120℃ (per ton)
Generating gas at 235.2m3(per ton)
Compatibility
Organic sediment removing efficiency>94%
Corrosion rate<1g/(m2 .h)
Not forming visible floccules or sediments

9. 2. Process
3. Applications
1. Introduction

10. Process
10
盲管
Pipes connecting Injecting HGSC Back-flowing
Reacting

11. Traits of Technique
11
Simple
 No special apparatus
 Time saved technique

12. Traits of Technique
12
3
4
5
6
7
0.1 0.15 0.2 0.25 0.3 0.35
pH
Conc. (g/mL)
YG-A
YG-C
Easy-treating
pH value of product is 6.5-7.0，neutral
Product has no needs of special treatment
Conc. v%
YG-B

13. Traits of Technique
13
Safe
 Ordinary inorganic salts
 Harmless to health
 Convenient to transportation

14. Traits of Technique
14
Formula adjustable
Basing on a target layer to adjust formula of HGSC system to get the
best effect.
-E/
0
/ e
n T m
a
dC dt k C C


15. 2. Process
3. Application
1. Introduction

16. Application
SZ36-1
LD5-2
LD4-2
LD10-1
JX1-1
PL25-6
Implementations of HGSC technique > 20

17. Application
200×10-3 μm2<k<8000×10-3μm2

18. Applications——SZ36-1-G5h1
18
Before：Liquid 48.8m3/d，Oil 3.4m3/d，Water cut 92%。
After：Liquid 74.5m3/d，Oil 60.7m3/d，Water cut 18.5%。
Cumulative Oil Gain: 25530m3 (2015.12)
0
10
20
30
40
50
60
70
80
90
100
0
20
40
60
80
100
120
140
2012/10/18 2013/5/6 2013/11/22 2014/6/10 2014/12/27 2015/7/15 2016/1/31
Water
cut
(%)
Production
(m3/d)
Water cut
Oil
Effect
Fluid

19. Applications——SZ36-1-D23
19
Before：Liquid 102m3/d，Oil 21.8m3/d，Water cut 78.6%。
After：Liquid 120.6m3/d，Oil 33.8m3/d，Water cut 75.3%。
0
10
20
30
40
50
60
70
80
90
100
0
20
40
60
80
100
120
140
160
180
2013/5/6 2013/8/14 2013/11/22 2014/3/2 2014/6/10 2014/9/18 2014/12/27 2015/4/6 2015/7/15 2015/10/23 2016/1/31
Water
cut
(%)
Production
(m3/d)
Effect

20. Applications——LD4-2-A7
20
Before：Liquid 25.2m3/d，Oil 3.7m3/d，Water cut 85.31%。
After：Liquid 20m3/d，Oil 24m3/d，Water cut 40%。
0
10
20
30
40
50
60
70
80
90
100
0
20
40
60
80
100
120
140
160
2013/8/14 2013/11/22 2014/3/2 2014/6/10 2014/9/18 2014/12/27 2015/4/6 2015/7/15 2015/10/23 2016/1/31
Water
cut
(%)
Production
(m3/d)
Effect

21. Applications——LD5-2-B13
21
Before：Liquid 8.3m3/d，Oil 6.34m3/d，Water cut 24%。
After：Liquid 80m3/d，Oil 60m3/d，Water cut 25%。
0
10
20
30
40
50
60
70
80
90
100
0
20
40
60
80
100
120
2014/3/2 2014/4/21 2014/6/10 2014/7/30 2014/9/18 2014/11/7 2014/12/27 2015/2/15 2015/4/6
Water
cut
(%)
Production
(m3/d)
日产液
日产油
含水
Effect

22. Applications
22
Summary Table in Bohai Bay, China (2015.12)
Well Date
Before Oil
m3
/d
After Oil
m3
/d
Cumulative Oil
Increase
m3
SZ36-1-G5h1 2013.8 3.39 52.38 25530
SZ36-1-D23 2013.9 21.8 33.8 4255.13
SZ36-1-D30 2013.10 30 53.15 5329.4
LD10-1-A15 2013.10 56.1 63.8 1700.9
SZ36-1-C3 2013.12 15.1 25.4 6025.55
LD4-2-A7 2014.4 3.71 20 4307.58
LD5-2-B13 2014.5 8.61 55 7571.54
SZ36-1-G40 2014.1 41.7 49 1429.57
JX1-1-A22h 2014.7 0.26 17.63 2548
SZ36-1-E8 2014.8 10.2 16.16 971.37
SZ36-1-C31 2014.12 10.3 46.3 6980.54
LD5-2-B12 2015.3 1.44 30.1 2872.7
LD5-2-A13 2015.7 0.27 16.6 474.07
Total 69996.35

23. Summary
Well Choosing for HGSC Technique
Inefficient well due to organic contamination
The well with more than 30% water cut
More asphaltene & resin
Heavy oilfield developed by water flooding
Mid-high porosity or permeability