K.T.BISSEMBAYEVA, A.U.AYTKULOV,

N.T.AZHIKHANOV, T.A.TURIMBETOV

Caspian State University of Technology and Engineering

named after Sh. Yesenov (Aktau, Kazakhstan)

The efficiency analysis of new technologies used for increase of oil recovery

Development works on introduction of the mechanical, physical, chemical, hydrodynamic and thermal increase of oil recovery (EOR) methods are conducted at Uzen deposit in different geological and physical conditions taking into account the state of industrial development of the field. These methods are:

1) Mechanical methods - hydraulic fracturing (HF), gas-dynamic fracturing (GDF), the acoustic effects (AE), electric influence (EI);

2) Thermal methods – termal gas acid perforating implosion stimulation (TGAPIS), termal barium chemical treatment (TBCT);

3) Physical and chemical methods - repair and sealing work (RSW), stimulation by cross-linked polymer layer system (SPS) and the polymer gel composition "Temposkrin" visco-elastic composition (VSL), hydrochloric acid treatment (SD), gidrokislotny blow (MAS), water-hydrocarbon emulsion (VUVE) emulsion combined effect of (ECI), glinoasidtreatment (IAT).

Design of species of the technologies shown in Figure 1. As is evident from the data presented in the chart, the most widespread adoption of technology was fractured in 2009 - 32% of the total work.

Figure 1 - Distribution of wells by type of technologies

Figure 2 - Distribution of additional oil production per well by technology stimulation for 2007- 2009 years.

Figure 2 compares the effectiveness of technologies for the years 2007-2009 [1, 2, 3]. As you can see, the most effective method is hydraulic fracturing.

The results of the gas-dynamic fracturing

We analyzed the results of the wells fracturing technology gasdynamic (GDF).

The method is designed to improve GDF wells in reservoir properties of reservoir rocks and increase the flow.

The results of the gas-dynamic fracturing

We analyzed the results of the wells fracturing technology gasdynamic (GDF).

The method is designed to improve GDF wells in reservoir properties of reservoir rocks and increase the flow.

The comparison of flow rates and water content in the wells before and after GDF 2007 to 2009 is shown in table 1 [1, 2, 3].

Results GDF proved effective in 59 wells, with no effect - 28 wells, including wells and 7 (well 2923, 4906, 5697, 5552, 4376, 3521, 6074), after oil production declined GDF 20, 25, 33 , 17, 33, 50, 40%, respectively, for 6 wells (wells 5202, 2672, 8352, 6114, 6067, 8426), oil production remained unchanged (from 1 to 5 tons / day). The main objects of GDF are well on 13 and 14 horizons degraded productive characteristics [4]. In 2007, as a result of 13 wells in GDF horizon increase oil production per well has averaged 5.5 tons / day.

Additional oil production per well was 3040, the operation tons. The success of 62%. In 2008, as a result of GDF in wells 13 and 14 horizons increase oil production per well has averaged 3 tons / day. Additional oil production by an average of one well operations amounted to 1371 tons.

Table 1 - Results of GDF

Horizon	Well quant	Interval of flooding, %	Liquid output, Ql (av), м^3/day			Oil output, Qoil(av) , т/с day		Water cutting av, %		Success, %
			Before stimulation		after	Before stimulation	after	Before stimulation	after
1	2	3	4		5	6	7	8	9	10
2007 year
13	3	0 - 50	4	12		3	9	44	30	73
13	4	50 - 100	9	18		4	9	58	49	54
Total	7	0 -100	6	15		3	9	51	39	63
2008 year
13	1	0 -50	4	8		3	4	32	52	47
13	4	50 -100	7	17		4	10	58	43	65
14	2	0 -50	6	11		4	7	44	37	62
14	4	50 - 100	10	9		1	3	82	65	61
15	2	50 - 100	7	10		2	5	77	54	67
16	3	50 - 100	4	8		2	6	54	46	52
17	1	0 - 50	4	5		2	3	45	44	36
17	3	50 - 100	7	11		3	5	56	45	44
18	1	0 - 50	8	20		6	12	36	35	52
18	1	50 - 100	7	8		3	5	55	40	50
20	1	50 - 100	2	4		1	2	59	44	57
21	1	50 - 100	2	14		1	3	90	75	64
Total	24	0 - 100	6	10		3	5	57	48	55
2009 year
13	1	0 -50	5	6		3	4	36	37	25
13	1	50 -100	4	13		1	5	73	59	80
14	4	0 - 50	9	19		5	11	44	40	49
14	5	50 - 100	4	12		1	5	78	52	77
15	1	0 - 50	5	30		2	13	46	55	85
15	3	50 - 100	9	21		3	11	73	50	69
16	1	0- 50	9	20		4	7	44	66	43
16	3	50 - 100	8	10		3	5	62	50	34
17	1	0 - 50	5	11		3	7	48	43	57
17	6	50 - 100	8	12		2	6	76	50	59
18	2	50 - 100	8	75		2	9	70	67	80
Total	28	0 - 100	7	22		3	8	61	53	63

Accumulated additional oil production was 32 898 tonnes. The success was 57%. In 2009, as a result of GDF in holes 13, 14, 15, 16, 17, 18 horizons increase oil production per well has averaged 5 tons / day.

Additional oil production by an average of one well operations amounted to 986 tons. Cumulative incremental oil production from 43 wells was 27 616 tonnes. The was success of 66%.

In general, for the period analyzed by conducting GDF oil production per well has increased on average 2.3 times more oil per well, the operation to an average of 2205 tons. Total cumulative additional oil production due to treatment was 54 177 tonnes. The success of the work amounted to an average of 62%. The duration of response was 300 days.

Technology GDF inferior fracture, but is also effective, helps to intensify development of oil reserves.

List of used sources

1. The report, "Current Analysis Uzen field development as of 01.01.2007." UV LLP "CTI"

2. The report, "Current Analysis Uzen field development as of 01.01.2008." UV JSC "KazNIPImunaygaz."

3. The report, "Analysis of the Uzen field development", JSC "KazNIPImunaygaz" Zhanaozen 2009.

4. Korostishevskaya MN Malyutina AE, Kuvandykova ZA etc. "Conversion of oil and gaza13-18 horizons Uzen Mangistau region on 01.01.2009," Agreement № 1710