INSTITUTE  OF  PULSE  PROCESSES  AND  TECHNOLOGIES

NATIONAL  ACADEMY  OF  SCIENCE  OF  UKRAINE
© 2012  Institute of pulse processes and technologies NAS of  Ukraine.   All rights reserved.

| Institute's structures | Dept. No 43 | Electrodischarge treatment for bottom-hole zones of Oil Well     
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       1. ESSENCE  OF  TECHNOLOGY. The electrodischarge treatment of bottom-hole zones of wells is intended to increase the productivity of recovery wells and intake capacity of pressure wells, to improve the connectivity with the wellbore due to growth of fractures or channels, purification of perforations and filters.

The electrodischarge technology is realized in a well filled with a fluid by intensive pulse impact on a zone disclosing the productive formation. This impact is produced by cyclic compression waves generated by the high-voltage electric discharge.

       THE  ELECTRODISCHARGE  TECHNOLOGY  PROMOTES  TO:

       THE  TECHNOLOGY  CAN  BE  APPLIED  FOR:
ELECTRODISCHARGE  TREATMENT  TECHNOLOGY  AND  EQUIPMENT
FOR  BOTTOM-HOLE  ZONES  OF  OIL  WELLS
   Energy consumption, kW·h
     2,0
   Surface part overall sizes, mm
     400280165
   Immersion part overall sizes, mm:
          diameter
          length in assembly, no more than

     102
     4700
   Weight, kg, no more than
          surface part
          immersion part

     15
     125
                                  
   Working temperature,   , no more than


     100
   Hydrostatic pressure, MPa, no more than
     45

                                                                                                                                                                                           -15      2
       The technology is realized for the rocks of any type with initial permeability more than 0,1·10        . The time mode of the device operation is thus fixed depending on the type of rocks, porosity, and bed strength.
The device is served by no less than 3 operators having access to operation of the high-voltage equipment. The device is hoisted and descended by the geophysical cable using a standard logging hoist (e.g, the logging truck -65 on base of the logging hoist -4; geophysical cable 3-70-180 or Euro standard).

       2.    ADVANTAGES:
     
       3. EFFICIENCY:
       Experience of electrodischarge method operation on hundreds of fields of Ukraine, Russia, Kazakhstan, China, etc. testify the increase of oil well debit more than twice; the intake capacity of pressure wells. Average time of the effect is 10 to 24 months with success rate of the method  80%. Results of the electrodishcharge technology application at some oil-producing wells of Ukraine, the CIS and beyond are given in Tables 3-7.
Table 1 - Technical characteristics of the device "Skif-100"
       The technology is realized by the electrodischarge immersion device in the wells stopped for underground or major repairs.
      
       Now, at the IPPT's premises 2 types of such devices are developed: "Skif-100 M" and "Orion".
Device "Skif-100" is powered by three-phase voltage 380 V AC, frequency 50 Hz.
Technical characteristics of the device are resulted in Table 1.

       The device "Orion-1" allows for considerable reduction of energy losses in a cable and provides for its frequency to 1 Hz.
The device "Orion-1" is powered by voltage 120 and 240V (+/-10%) AC, one phase with earthing, frequency 50 and 60 Hz (+/- 1%).
Technical characteristics of the device "Orion-1" are given in Table 2.

   Energy consumption, kW·h
     no more than 3 kW
   Surface part overall sizes, mm
     500500220
   Immersion part overall sizes, mm:
          diameter
          length in assembly, no more than

     102
     4900
   Weight, kg, no more than
          surface part
          immersion part

     15
     130
                                  
   Working temperature,   , no more than


     100
   Hydrostatic pressure, MPa, no more than
     45
Table 2 - Technical characteristics of the device "Orion-1"
Table 3 - Results of use of the electrodischarge method on oil-producing wells of Ukraine
Field
Well No.
Debit before treatment
Debit after treatment
  Q      , tpd
       fluid
  Q    , tpd
       oil
  Q      , tpd
       fluid
  Q    , tpd
       oil
  Lelyakovskoye
Kraslyany-2
5,0
0,4
78,0
2,0
  Prilukskoye
27
2,0
1,6
5,6
5,3
  Prilukskoye
14
2,0
1,6
5,6
5,3
  Prilukskoye
64
2,5
2,5
3,0
3,0
  Prilukskoye
27
4,2
4,0
13,2
12,2
  Prilukskoye
27
6,2
5,7
12,0
11,64
  Novo-Hryhor'yevskoye
64
2,43
0,5
4,3
1,16
  Bogdany
54
8,0
0,1
45,3
23,9
  Bogdany
60
6,5
2,1
46,1
34,4
  Bogdany
81
2,0
2,0
3,9
3,0
  Mil'ki
64
10,6
4,6
21,0
12,0
  Hnedintsy
171
38,3
0,5
100,0
2,5
  Prilukskoye
14
3,0
3,0
10,4
9,8
  Bogdany
75
43,9
30,0
42,0
37,5
  Dovbushansko-Bystritskoye
90
0,619
0,46
1,72
1,24
  Lukvinskoye
58
0,287
0,24
1,19
1,0
  Dovbushansko-Bystritskoye
9
0,593
0,5
1,597
1,2
  Pnivskoye
8
0,456
0,34
1,578
1,07
Wells No.
Debit before treatment,
tpd
Debit after treatment,
tpd
      Q
            fluid
      Q
            oil
      Q
            fluid
      Q
            oil
9213
4,2
0,2
99,8
19,4
2080
4,3
2,7
15,09
10,1
1282
0,6
0,6
1,3
1,2
111
11,4
5,8
13,9
6,3
726
6,1
0,5
8
0,7
10073
0,9
0,1
87,3
26,9
21413
19,2
8,9
95,0
44,3
Table 5 - Results of use of the electrodischarge method
on oil-producing wells of Russia
(Usinskoye oil field)
Wells No.
Debit before treatment,  tpd
Debit after treatment,
tpd
      Q
            fluid
     Q
           oil
     Q
            fluid
     Q
           oil
1596
10,0
8,6
22,0
14,2
6153
11,0
3,6
20,0
8,1
2895
12,2
8,2
15,0
8,4
Table 4 - Results of use of the electrodischarge method
on oil-producing wells of Russia
(oil fields of Perm' region)
Table 6 - Results of use of the electrodischarge method
on oil-producing wells of China
(Karamaj field)
Wells No.
Debit before treatment,  tpd
Debit after treatment, 
tpd
      Q
            fluid
     Q
           oil
      Q
            fluid
     Q
           oil
52034
1.6
0.5
3.8
1.9
7312
3.4
2.8
5.9
3.7
52020
1.9
1.5
2.7
1.9
7 - 2
No inflow
4.6
4.4
7142
No inflow
9.0
6.8
5278
2.3
2.1
7.1
3.9
8834
39.1
19.6
59.9
49.9
Table 7 - Results of use of the electrodischarge method
on oil-producing wells of Kazhakhstan
Wells No.
Treatment interval,
m
Debit before treatment,
tpd
Debit after treatment,
tpd
      Q
            fluid
     Q
           oil
      Q
            fluid
     Q
           oil
886
1274-1284
24
24
7177
1255-1258
1264-1268

8

6
2559
1209-1214
1218-1227
12
5
51
48
276-
1352-1358
1361-1366
29
14
57
28
Preparation of the high-voltage electrodischarge
installation for immersion into a well