Crushing

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:

removal of various types of deposits in the bottom-hole formation zone, prevention of the subsequent growth of crystals of deposits and their adhesion to a surface, increase of the effective time;
formation and spread of existing fractures and making new fracture channels;
evacuation of polluting substances from pores;
destruction of a structural skeleton of oil in the pores, improvement of its mobility during filtration.

THE TECHNOLOGY CAN BE APPLIED FOR:

increasing the productivity of recovery and pressure wells during underground and major repairs, restoring the artesian well debit;
treatment of the bottom-hole zones of high-viscous, paraffinic oil and bitumen beds;
stimulation of a well during development, enhancing the intake capacity of wells for underground storage of gas;
improving the quality of a cement ring during well cementing;
stimulation of potentially productive beds in exploration and development wells.

Energy consumption, kW·h	2,0
Surface part overall sizes, mm	400х280х165
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
о Working temperature, С, 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 м . 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 АКС-65 on base of the logging hoist ПК-4; geophysical cable КГ3-70-180 or Euro standard).

2. ADVANTAGES:

ecological cleanness combined with high productivity of treatment;
retention of a treatment effect for more than 10 months;
selective affect in a local bed zone;
simple and dependable service;
minimum energy consumption;
multiple cyclic impact during one descent.

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.

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-100М" 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	500х500х220
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
о Working temperature, С, no more than	100
Hydrostatic pressure, MPa, no more than	45

Field	Well No.	Debit before treatment		Debit after treatment
Field	Well No.	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
Wells No.	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

Wells No.	Debit before treatment, tpd		Debit after treatment, tpd
Wells No.	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

Wells No.	Treatment interval, m	Debit before treatment, tpd		Debit after treatment, tpd
Wells No.	Treatment interval, m	Q fluid	Q oil	Q fluid	Q oil
886	1274-1284	нет притока		24	24
7177	1255-1258 1264-1268	нет притока		8	6
2559	1209-1214 1218-1227	12	5	51	48
276-К	1352-1358 1361-1366	29	14	57	28

Wells No.	Debit before treatment, tpd		Debit after treatment, tpd
Wells No.	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