The way of the development of oil deposits

 

(57) Abstract:

The invention relates to the oil industry and can find application in the development of oil reservoirs with high water content oil. Reduces the water content of oil and enhanced oil recovery reservoir of the invention: in the development of oil deposits are injecting working agent through the injection wells. The selection of oil lead through production wells. Operation part of the wells are in cyclic mode "operation - stop". In one of the half-cycles "stop" in the hole in the upper productive interval post-acoustic emitter. Conduct seismic impact within 60-90 minutes Move acoustic emitter along the productive interval, with stops through 1.0 to 1.5 m for 60-90 min, during which the conduct seismic impact. Upon completion of the seismic impact conduct well-stimulation treatment bottomhole producing wells with low water content oil. Repeat operations through 6-50 months.

The invention relates to the oil industry and can find application in the development of oil deposits with high Obvodnogo the injection well, the selection of oil through the production wells, placement in the injection well in the productive interval of the formation acoustic emitter and conducting acoustic stimulation (R. H. Muslimov and other Geology, development and operation of the Romashkinskoye oil field. Volume 2. -M.: VNIIEM, 1995, S. 174, 175, 183-185).

There is a method very little impact on reducing the water content of the oil.

Closest to the invention to the technical essence is the way of the development of oil deposits, including the injection of working agent through the injection wells, oil extraction through production wells, the operation of injection wells in cyclic mode injection-stop, in one of the half-cycles "stop" into the injection well in the upper productive interval accommodation acoustic emitter, conducting seismic impact within 20-40 minutes, moving acoustic emitter along the productive interval, with stops through 250-500 mm 20-40 min, during which the conduct of seismic and acoustic effect, the repetition of the operations through 6-50 months (RF patent 2137916, class. E 21 In 43/16, E 21 In 43/25, publ. 20.09.99 - prototype).

but the small thickness of the productive strata, however, the method is ineffective when developing oil deposits with relatively large thickness of the productive layers.

The invention solves the problem of reducing the water content of oil and enhanced oil recovery reservoir.

The task is solved in that in the method of development of oil deposits, including the injection of working agent through the injection wells, oil extraction through production wells, the exploitation of the part of wells in a cyclic mode of operation-stop, in one of the half-cycles "stop" in the hole in the upper productive interval accommodation acoustic emitter, conducting seismic impact, moving acoustic emitter along the productive interval, during which the conducting seismic impact, and repeating operations through 6-50 months, according to the invention the conducting seismic impact exercise for 60-90 min, moving acoustic emitter along the productive interval perform with stops through 1.0 to 1.5 m for 60-90 min, and after seismic impact conduct well-stimulation treatment bottomhole producing wells is through the injection well;

2) selection of oil through the production well;

3) the operation of part of the wells in the cyclic mode of operation-stop";

4) in one of the half-cycles "stop" in the hole in the upper productive interval accommodation acoustic emitter;

5) conduct seismic effects;

6) conduct acoustic effects within 60-90 min;

7) moving acoustic emitter along the productive interval, during which the conducting seismic effects;

8) moving acoustic emitter along the productive interval, with stops through 1.0 to 1.5 m for 60-90 min;

9) repeating operations through 6-50 months;

10) upon completion of the seismic impact of conducting well-stimulation treatments bottomhole producing wells with low water content oil.

Signs of 1-5, 7 and 9 are common with the prototype, signs 6, 8 and 10 are the salient features of the invention.

In the development of oil deposits gradual flooding of oil. The invention solves the problem of reducing the water content of the oil. The problem is solved by application of the following dares producing wells. Operation part of the wells (injection or mining) are in cyclic mode "operation-stop". In one of the half-cycles "stop" in the hole in the upper productive interval post-acoustic emitter and conduct seismic impact within 60-90 minutes Move acoustic emitter along the productive interval, with stops through 1.0 to 1.5 m for 60-90 min, during which the conduct seismic impact. Upon completion of the seismic impact conduct well-stimulation treatment bottomhole producing wells with low water content oil. Repeat operations through 6-50 months.

Set parameters for moving acoustic transmitter and the acoustic duration of exposure to allow the greatest degree to reduce the water content of the oil. Repetition of the operations through 6-50 months due to the duration of the effect of reducing the water content of the oil.

The method is most applicable to the oil with a relatively large thickness of the productive strata. As a rule, these layers with a thickness of more than 4 m

As the acoustic emitter, as in the prototype, usage, the Lok power generation of the triggering pulse and the synchronizing pulse, managed key-discharger and discharge the container from the electroacoustic transducer.

Surface panel contains circuitry that provides power to the downhole probe devices of the control voltage, the voltage and current supplied to the probe, switches, regulating the charge current probe and the duration of the charge and block circuit protection equipment in case of emergency situations.

The downhole probe has the following characteristics: length of borehole probe 3.5 m diameter borehole probe 100 mm, the weight of the downhole probe 90 kg, the pressure in the momentum developed in the water at a distance of 1 m is equal to 3105PA, the performance of the emitter 9-11 pulse/min, voltage 220 V, 50 Hz, power consumption of the network 1 kW, operating temperature 100oWith a working pressure of 40 MPa.

Upon completion of the seismic impact analyze the water content of the oil producing wells reservoir. In wells with low water content oil conduct well-stimulation treatment of critical areas. Unlike waterproofing works, resulting in reduced flow rate by reducing the water content of oil, interstorey development, etc. used or the type of well-stimulation process. In carbonate reservoirs proved acid treatment. In shale reservoirs used clay formation removal. In kolmat palatinolinotype sediments of the bottom-hole zones of the applied heating, washing solvents, etc. For well-stimulation treatments may be applied implosion technology impact, acoustic and chemical stimulation of gas-dynamic fracturing using thermocatalytic compositions, etc.

Specific example

Develop oil reservoir Romashkinskoye field with the following characteristics: porosity 11.9%, permeability 0,029 μm2the saturation 61,1%, absolute mark oil-water contact 870 m, the average saturated thickness of 6 m, the initial reservoir pressure of 11 MPa, reservoir temperature 25oWith the parameters of the reservoir oil density 930 kg/m3the viscosity of 46 MPa.C, the saturation pressure of 1.8 MPa, the gas content of 15.2 m3/t, the sulfur content of 3.64%.

Download the working agent associated produced water, 40 injection wells, selected oil through 90 producing wells. One injection well explanatorily wells in the upper productive interval post-acoustic emitter and conduct acoustic effect within 60 minutes Move the acoustic emitter along the productive interval with stops in 1 m for 60 min, during which the conduct seismic impact. After going through the entire productive interval of the newly placed acoustic emitter in the upper productive interval and repeat all the operations. So spend acoustic effect within 15 days of stopping the injection wells. After that, through this injection well pump working agent within 15 days. At the next stop injection wells seismic effects are not conducted.

70 producing wells, the water content of the oil was reduced. In these wells hold well-stimulation treatment bottomhole injection of a 12% aqueous solution of hydrochloric acid in a volume of 1 m3/m productive interval.

Again-acoustic effects perform this well at 18 months. In producing wells in which the water content of oil decreased, conduct well-stimulation treatment of critical areas.

As a result, the water content of the oil was reduced from 75% to 45%.

Moving acoustic emitter bbefore the field, and seismic effects, leads to a similar result.

The application of the proposed method will reduce the water content of the oil and improve the oil recovery reservoir.

The way of the development of oil deposits, including the injection of working agent through the injection wells, oil extraction through production wells, the exploitation of the part of wells in cyclic mode "operation stop", one of the half-cycles "stop" in the hole in the upper productive interval accommodation acoustic emitter, conducting seismic impact, moving acoustic emitter along the productive interval, during which the conducting seismic impact, and repeating operations through 6-50 months, characterized in that the conducting seismic impact exercise for 60-90 min, moving acoustic emitter along the productive interval perform with stops through 1.0 to 1.5 m for 60-90 min, and after seismic impact conduct well-stimulation treatment bottomhole producing wells with low water content oil.

 

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