Method for extraction of water-clogged oil deposit

FIELD: oil industry.

SUBSTANCE: method includes determining dominating frequency of productive bed by performing prior vibration-seismic action using surface oscillations source at different frequencies and analysis of seismic graphs from seismic receivers in product wells. Vibration-seismic effect on watered portion of productive bed of oil deposit is performed by a group of surface oscillations sources, operating at dominating frequency of productive bed. Bed fluid is extracted via product wells. After vibration-seismic effect on watered portion of productive bed of oil deposit by a group of surface oscillations sources, operating at domination frequency of productive bed, concurrent vibration-seismic effect is performed using two sub-groups of said group of surface oscillation sources. Each sub-group of group operates at determined from mathematical dependence. Average frequency of surface oscillations sources of whole group is equal to dominating frequency of productive bed. Difference in frequencies, on which each sub-group operates, is determined in accordance to linear size of watered portion of productive bed of oil deposit and is satisfactory to mathematical dependence. Concurrent vibration-seismic effect by two sub-groups of said group of surface oscillations sources is performed with forming of wave having length exceeding length of wave with dominating frequency.

EFFECT: higher oil yield.

2 ex

 

The invention relates to the oil industry, namely to methods further flooded oil fields with the use of vibro impact generators of elastic waves with a working frequency range from 0.1 to 250 Hz.

There is a method of stimulation /Patent RF №2046936, E 21 In 43/25, 1995/, which excited in him of elastic waves by vibration, the mode and conditions of which are chosen according to preliminary studies in different phases of the earth's tides. The disadvantage of this method is the need to work within a certain timeframe, depending on the phases of the earth's tides.

There is a method of development of gas condensate fields /A.S. USSR №1153612, E 21 In 43/24, 1982/, is the impact on the formation of elastic waves with a frequency of from 0.1 to 50 Hz, directed perpendicular to the plane of the bedding layer and emitted from ground-based generators. The selection of frequency is provided by a resonant mode absorption layer of the energy of elastic waves. The disadvantages of the method are its narrow focus associated with the use of one specific resonant frequency, and a limited impact on the area due to the lower energy of elastic waves at a relatively high resonance frequency.

Closest to the proposed method of development of flooded oil fields is possible /A.S. The USSR №1596081, E 21 In 43/00, 1990/includes vibro impact on irrigated land productive formation by a group of land-based sources of fluctuations, operating on the dominant frequency of the reservoir, installed in water-saturated parts for the oil-bearing contour and move as cessation increase the oil content in the borehole fluid. The effectiveness of the method of the prototype is not high enough at relatively high dominant frequency due to the rapid decrease of the amplitude of elastic waves. Accordingly, the lack of effective radius of influence, especially for large geological phone

Solved the problem and the expected technical result consists in increasing oil recovery from flooded oil fields due to the complex vibro impact on the reservoir waves with a dominant frequency and waves with a relatively low frequency, taking into account the sizes of the watered area of the reservoir. Decreasing the water content of the produced fluid; due to the relative increase in the amplitude of the elastic wave increases the effective radius of influence and, accordingly, the oil recovery. The method is particularly effective when applied to large geological bodies.

The problem is solved in that the proposed CSP is about the development of flooded oil fields, including determining the dominant frequency of the productive formation by pre-vibro impact terrestrial source of oscillations at different frequencies and the analysis of the seismograms of seismic receivers in producing wells, vibro impact on irrigated land productive formation of oil deposits of the group of land-based sources of fluctuations, operating on the dominant frequency of the reservoir, and the selection of the reservoir fluid production wells, characterized in that after vibro impact on irrigated land productive formation of oil deposits of the group of land-based sources of fluctuations, operating on the dominant frequency of the reservoir, carry out simultaneous vibro impact of the two subgroups of this group of land-based sources of oscillations, each of which operates at a frequency determined by the formula

ν10-Δν/2,

ν20+Δν/2,

where ν1- the frequency of the first sub-group land-based sources of fluctuations;

ν2the frequency of the second sub - group land-based sources of fluctuations;

Δν - the frequency difference,

moreover, the average frequency of land-based sources of oscillations of the entire group is equal to the dominant frequency of the reservoir, and the frequency difference, the and employing each of the subgroups, determined in accordance with the linear size of the watered area of productive formation of oil deposits and satisfies the requirement

Δν=υ/lmax,

where υ - the average speed of the elastic waves in the strata of rock, installed by seismic data at the frequency of operation of the subgroups of this group of land-based sources of fluctuations (the value is almost constant for a given geological environment);

lmaxlinear size of the watered area of productive formation of oil deposits, while simultaneously vibrating seismic impact of the two subgroups of this group of land-based sources of oscillation is performed with the formation of waves beating is longer than the wavelength of the dominant frequency.

The method is carried out by a group of two or more land-based sources of fluctuations in the following sequence of operations.

1. Determining the dominant frequency of the productive formation v0the preliminary vibro impact terrestrial source of oscillations at different frequencies and the analysis of the seismograms of seismic receivers in producing wells.

2. Vibro impact on irrigated land productive formation by a group of land-based sources of fluctuations, operating on the dominant frequency of the productive formation &x003BD; 0.

3. Separation of the group of land-based sources of fluctuations in the two subgroups and setup each of the subgroups to work on specific frequency.

This requirement Δν=υ/lmaxdue to the minimization of the difference of the frequencies for the formation of waves beating. As is well known, the phenomenon of beats occurs with the addition of oscillations with close frequencies /New Polytechnic dictionary. CH. edit Awesone, M., ed. “Great Russian encyclopedia”, 2000, p.48/. In this case, the difference frequency will be the frequency of the beats:

12|=Δν=νb.

The lower frequency beats, the less energy loss elastic waves and, accordingly, the greater the distance of its distribution.

The maximum amplitude of the generated waves beating is the sum of the amplitudes of elastic waves all land-based sources of vibrations.

4. Parallel vibro impact of the two subgroups of this group of land-based sources of oscillations, each of which works on a specific according to claim 3 frequency, for the formation of waves beating.

Provides a comprehensive impact on the reservoir. Vibro impact on irrigated land productive formation by a group of land-based sources of fluctuations, operating on the dominant frequency of the productive formation of oil deposits, is:

- elastic in nature, if the linear sizes of the watered area of productive formation exceeds the wavelength from sources of vibration; or

inelastic nature - if the linear sizes of the watered area of the productive formation is less than a wavelength from the source of vibrations.

The elastic nature of the deformation layer is accompanied by the displacement of the particles within the processed flooded area of the reservoir, reducing the adhesive forces between the film of oil from the formation and the viscosity of the structured residual oil. In the manifold formed microcracks. Increase the permeability of the reservoir and the filterability of the oil.

The inelastic nature of the deformation layer is accompanied by a shift of the processed watered area of productive formation of oil deposits in relation to other geological bodies or environment. Formed macro-cracking and faults slip through the release of energy compression (tectonic energy), disclosed closed cracks.

If the impact of the prototype - group land-based sources of fluctuations, operating on the dominant frequency of the productive formation ν0inelastic deformation is caused in the geological bodies with linear dimensions less than the wavelength of the dominant frequency, i.e. less than the value of λ000when the impact of the two subgroups of land-based sources of oscillations, each of which operates at a certain frequency according to the proposed method, due to the phenomenon of beats is formed wave with a low frequency and, accordingly, large wavelength beats λb0b; inelastic deformation is caused in the geological bodies with linear dimensions less than a wavelength of beats λb0bwhere λb0.

It is known that the larger the size of the geological body, the larger inelastic deformations breed: long formed the cracks, more bias layers and blocks relative to each other. Given that the wavelength of the beat, we get the claimed method, significantly greater than the wavelength of the dominant frequency, the technological effect of the claimed method also significantly increased due to the higher intensity of the waves beating, and are caused by the inelastic deformation of a larger geological phone mode beating increases the radius of the effective stimulation.

Authors known way acoustic treatment of the production zone of the well /Patent RF №2162519, E 21 In 43/25, E 21 In 28/00, 2001/, which consists in the excitation of the acoustic borehole emitter of acoustic oscillations affecting the frequency of technology what about the range 10-60 kHz on the near productive zone of the bore hole, and differential Raman frequencies in the range of 20-400 Hz - far productive zone of the well. The application of the method increases the production rate of the well.

The proposed technical solution is implemented, respectively, are not well, and land-based sources of fluctuations, the effect on the oil reservoir oil reservoir as a whole and solve the new technical problem - enhanced oil recovery - due to new technical result - reduce the water content of the produced fluid. Therefore, the invention, according to the authors, meets the criterion of “inventive step”.

EXAMPLES of SPECIFIC implementation of the METHOD

Example 1. Field Kukulska.

Oil deposits are confined to the Sandstone strata D1and D2characterized by the fracture. The thickness D1and D24-6 meters Cracks filled with bitumen, clay and lenograstim material. In places the Sandstone enriched gravel material. Gravel sand medium and coarse, unsorted and uneven clay.

The depth of the productive strata 1400-1470 m

Oil viscosity is high: 63,3-71,6 MPa·C.

The cut wells reaches 90% or more. Mine is in the final stages of development. Drilled on a grid of 13 ha/VCS.

These x the characteristics of the deposits indicate favorable for vibro impact conditions: high viscosity oil, a relatively small depth of the productive strata, Sandstone with not sorted gravel material, susceptible to compaction when vibro impact.

For vibro-seismic impacts of four land-based sources of fluctuations ST. mark 10/180 was selected as one of the domes with a radius of 2 km on the oil confined to stratum D2. In three producing wells with faces that are located at a distance of 250 m and 300 m from the generator of elastic waves were flat cable. Conducted preliminary vibro impact ground-based source of oscillations at different frequencies from 10 up to 150 Hz. Analysis of seismograms after exposure helped to identify the dominant frequency ν0waves that reach the geophones with the maximum amplitude. She was on average close to 35 Hz.

According to the analysis of the geological structure of the dome and field indicators of development of deposits, it was decided to comprehensively influence the plot, linear size lmax=500 m, located on the most steep West wing of the dome.

Vibro impact was carried out in two stages.

In the first stage, all four ground vibration source worked for 4 days synchronously with the frequency equal to the dominant 35 Hz.

In the second stage group ground the sources of fluctuations was divided into two subgroups.

The frequency of land-based sources of oscillations of the first and second sub-groups was calculated by the formula

ν1,20±Δν/2,

where Δν=υ/lmax

The speed of elastic waves in the strata of rock, a previously installed by seismic data, is υ=5000 m/s, so

Δν=5000 m/s/500 m;

Δν=10 Hz.

ν1=35 Hz +10 Hz/2=40 Hz.

ν2=35 Hz -10 Hz/2=30 Hz.

Thus, the “carrier” wave resulting from the superposition of elastic waves from all land-based sources of fluctuations had an average frequency equal to the dominant frequency:

νcp=(40 Hz +30 Hz)/2=35 Hz.

And arising from the superposition of wave run-out had a frequency

νb=10 Hz.

After exposure mode beating in the next few days cut wells decreased by 8%. Accordingly, increased oil recovery.

Example 2. Field Mancharovskoe. Kowalski plot.

Kowalska structure contrived sagepay - 1160 m Size patterns 3×2.5 km and a height of 25 meters

Oil deposits are confined to the Sandstone formations CVI1, CVI2, CVI3 visean tier of the Carboniferous system. The thickness of the layers varies from 0.79 m to 24.99 m, porosity - from 15.3% to 28%, the viscosity of the oil and 29.6 MPa·C.

Kowalski the site is located in a late stage of development and is characterized by high obvo what nanotu produced fluid (95,5%), a decline in oil production while increasing the sampling reservoir fluid.

According to the analysis of the geological structure Chuvashskoi patterns and field indicators of development, it was decided to carry out works on a new technology vibro impact of an oil reservoir to increase oil recovery. The linear size of the plot on which it was produced vibro impact of four land-based sources of fluctuations, which are used seismic vibrators “Mertz”, is about

Lmax=850 m

To determine the exposure parameters were experimental work. The frequency of impacts of land-based sources of fluctuations varied from 10 to 100 Hz. Dominant frequency ν0was determined by the maximum “response” oil reservoir downhole device ABB-400, located in the perforation interval of one of the production wells in the area. The dominant resonant frequency of the layer is equal to 20 Hz. Vibro impact was carried out in two stages.

In the first stage, all four ground vibration source worked synchronously within 4 days from the frequency of the excited elastic waves 20 Hz, is equal to the dominant.

In the second stage land-based sources of fluctuations were divided into two groups of two.

The frequency of land-based sources the number of the oscillations of each subgroup was calculated by the formula

ν1,20±Δν/2,

where Δν=υ/lmax

The velocity of propagation of elastic waves by seismic data on the site is υ=5100 m/s,

so Δν=5100 m/s/850 m;

Δν=6 Hz.

Then the frequency of subgroups land-based sources of oscillations is:

ν1=20 Hz +6 Hz/2=23 Hz.

ν2=20 Hz -6 Hz/2=17 Hz.

Thus, the “carrier” wave resulting from the superposition of elastic waves from all land-based sources of fluctuations had an average frequency equal to the dominant frequency:

νcp=(23 Hz +17 Hz)/2=20 Hz.

And arising from the superposition of wave run-out had a frequency

νb=6 Hz.

Vibro impact in this mode was carried out continuously for one month.

Average oil production for Chuvashskom site before starting work on vibro impact was about 5870 tons. Average additional oil production resulting from the application of the inventive technology vibro impact amounted to about 1250 tons (an increase of 21%). The effect was achieved by reducing the water content of the produced fluid to 94,3%.

A significant advantage of the inventive technology is the duration of effect is enhanced oil recovery within 12 months and over.

How about isleno applicable, simple, environmentally safe.

The way to develop flooded oil fields, including determining the dominant frequency of the productive formation by pre-vibro impact terrestrial source of oscillations at different frequencies and the analysis of the seismograms of seismic receivers in producing wells, vibro impact on irrigated land productive formation of oil deposits of the group of land-based sources of fluctuations, operating on the dominant frequency of the reservoir, and the selection of the reservoir fluid production wells, wherein after vibro impact on irrigated land productive formation of oil deposits of the group of land-based sources of fluctuations, operating on the dominant frequency of the reservoir, carry out simultaneous vibro impact of the two subgroups of this group of land-based sources of oscillations, each of which works at a frequency determined by the formula

ν10-Δν/2,

ν20+Δν/2,

where ν1- the frequency of the first sub-group land-based sources of fluctuations;

ν2the frequency of the second sub - group land-based sources of fluctuations;

Δν - the difference cha is the one

moreover, the average frequency of land-based sources of oscillations of the entire group is equal to the dominant frequency of the reservoir, and the difference frequencies at which each of the subgroups, defined in accordance with the linear size of the watered area of productive formation of oil deposits and satisfies the requirement

Δν=υ/lmax,

where υ - the average speed of the elastic waves in the strata of rock, installed by seismic data at the frequency of operation of the subgroups of this group of land-based sources of fluctuations (the value is almost constant for a given geological environment);

lmaxlinear size of the watered area of productive formation crude oil,

when this simultaneous vibro impact of the two subgroups of this group of land-based sources of oscillation is performed with the formation of waves beating is longer than the wavelength of the dominant frequency.



 

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