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 deposits. Provides the definition of supply interlayers and enhanced oil recovery reservoir through the water shutoff. The inventive method are injecting working agent through the injection wells and oil extraction through production wells. Gamma-ray log curves is removed during operation of the wells. In the studied wells combine the next and previous curves of gamma logging. Build a curve of the difference between the values of gamma units subsequent and previous curve. The maximum difference between the values of gamma units taken for 100%. Determine the dynamics and % change of gamma units in the areas of productive layers. Accept that the movement of the brine weak when changing the gamma-ray units up to 25%, from 25% to 75% is the average, over 75% - intensive. In the presence of dynamics watering is judged on the promotion of the formation water to the well. In flooded interlayers perform isolation brine and alignment profile pick in the wells. Remove gamma logging curves before and after photoisolator the and.

The invention relates to the oil industry and can find application in the development of oil deposits.

There is a method of developing a flooded oil fields, including periodic injection through injection wells hydrocarbon fluid and a gelling material, the injection of the displacing agent and oil extraction through production wells (RF patent No. 2143059, CL E 21 In 43/22, publ. 1999.12.20).

The method allows for the isolation of water supply zones of the formation and alignment of the profile injectivity of injection wells. However, the method does not provide definitions watered interlayers and quality waterproofing, so the increase in oil recovery is low.

Closest to the invention to the technical essence is a way to develop oil deposits, confined to carbonate reservoirs, including the drilling of production and injection wells the main and reserve funds and the perforation in the range of productive strata, the water is injected through injection wells, oil production through production wells, various methods geophysical study in the operation of wells, the injection well is AST, but giving water after cessation of injection when removing the pressure on the mouth of the injection wells, in dependence of the interlayer to the marker selection intervals, identical in mining and other injection wells, and according to the method of neutron-gamma logging determination of filtration characteristics and distribution across the area of the interlayer, not receiving water for injection, but giving water after cessation of injection, and the drilling of production and injection wells reserve Fund taking into account the distribution of the interlayer area (patent RF №1322743, CL E 21 In 43/20, publ. 2000.04.27 - prototype).

The known method does not allow to determine watered interlayers to carry out waterproofing works and, thereby, to increase the recovery rate deposits.

In the proposed method solves the problem of determining the supply interlayers and enhanced oil recovery reservoir through water shutoff.

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, conducting gamma logging in wells and detection layers with characteristic properties, coz the combine next and previous curves of gamma logging, build a curve of the difference between the values of gamma units subsequent and previous curve, the maximum difference between the values of gamma units take 100%, determine the dynamics and % change of gamma units in the areas of productive layers, accept that the movement of the brine weak when changing the gamma-ray units up to 25%, from 25% to 75% is the average, over 75% are intensive in the presence of dynamics watering judge the promotion of formation water into the well, in the watered interlayers perform isolation brine and alignment profile pick in wells, remove gamma logging curves before and after waterproofing works and abrupt change indicators gamma logging judge the passage of water agent.

Features of the invention are:

1) download working agent through the injection well;

2) selection of oil through the production wells;

3) a gamma ray logging tool in the borehole;

4) identify interlayers with characteristic properties;

5) removing the gamma-ray log curves in the operation of wells;

6) in the studied wells the combination of subsequent and previous curves of gamma logging;

make the maximum difference between the values of gamma units per 100%;

9) determination of the dynamics and % change of gamma units in the areas of productive interlayers;

10) adoption of that motion brine weak when changing the gamma-ray units up to 25%, from 25% to 75% is the average, over 75% of intensive;

11) in the presence of dynamics watering judgment on the promotion of the formation water to the borehole;

12) in flooded interlayers activities for isolation of formation waters and alignment profile pick in wells;

13) removal of the gamma-ray log curves before and after waterproofing works;

14) by the abrupt change of the indicators gamma logging judgment about the passage of water agent,

Signs 1-4 are common with the prototype, signs 5-14 are the salient features of the invention.

The invention

In the development of oil deposits, uneven watering interlayers. To establish how interlayer and the extent to which obwodnica, it is very difficult. In the proposed method solved the problem of determining the water content of the interlayer by gamma logging in wells. The subsequent conduct of the waterproofing work contributes to the increased production is the development of oil deposits are injecting working agent through the injection wells and oil extraction through production wells. Gamma-ray log curves is removed during operation of the wells. The method is based on the fact that produced water washes away the radioactive elements in rocks (salt) and carrying them toward the producing wells. Radioactive elements in rocks accumulate in the near-wellbore zone, deposited on the tubes, they absorb clay. If the gamma-logging such deposits define and record. In the studied wells combine the next and previous curves of gamma logging, i.e., impose one curve to another. Normalize curves, i.e., establishing uniform scale and a single system of measurement (gamma, x-rays, pulses/min). Build a curve of the difference between the values of gamma units subsequent and previous curve. Define the zones of change of the difference values of gamma logging notably, determine the length of time zones at depth and amplitude (difference values). The presence of the identified zones define the movement (flow) of the formation water can even be produced as associated and pumped back into the well). The maximum difference between the values of gamma units taken for 100%. Determine the dynamics and % change of gamma units in the areas of productive layers. In producing wells accept that the movement produced water is of the opinion about the promotion of the formation water to the well. In flooded interlayers perform isolation brine and alignment profile pick in the wells. Waterproofing work is carried out on fresh, i.e. Naletova water. Therefore, when the injection water composition of radioactive elements in the rocks become from the wells and the gamma value of the units is reduced. Remove gamma logging curves before and after the waterproofing works. On abrupt change (decrease) the values of gamma logging judge the passage of water agent.

Similarly for injection wells to determine where is the working agent into the producing formation or past.

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 8 m, the initial reservoir pressure of 11 MPa, reservoir temperature - 25C, the parameters of the reservoir oil: density of 930 kg/m3viscosity - 46 mPas, the saturation pressure of 1.8 MPa, gas content - 15.2 m3/t sulphur content is of 3.64%.

Download working AG the wells 10 wells in each row. Select the oil through a series of extraction wells 10 wells in each row. The distance between the wells in rows is 500 m

Using archival data gamma-ray obtained in the open hole to the beginning of the operation, i.e. during drilling.

One of the wells drilled as mining. The initial flow rate was 7.6 tonnes, a water content of 60%. After 14 years, the water content increased to 99.4%. Well shoot gamma logging curves. Combine curve obtained in an uncased borehole during construction, and a curve obtained after 14 years of operation, i.e., impose one curve to another. Normalize curves, i.e., establishing uniform scale and a single system of measurement range. Build a curve of the difference between the values of gamma-units of the second and the first curve. For this is the equation of a straight line on the control points Y=f(x) for a pair of curves of gamma logging, where the Y - values gamma-ray, x - depth of the well. Determine the coefficients (a, b) of formulas of the conversion curves of gamma logging to a single average curve Y*=ax+b, i.e., establishing uniform scale and a single system of measurement range. Find the discrepancy between the calculated parameters Y*and the measured Y pokazayvaet differences gamma units is 0.25-10 scales. The difference between the maximum and minimum value of gamma units when combining the curves of gamma-ray log for this well take over 100% (in particular, about 10 schemes). Reveal that for productive interlayers average change (the difference between the values of gamma-units) on the plot development is 60%. Similarly conduct research in other wells.

Reveal that in two producing wells in three layers with thickness of 1 m change gamma units is approximately 80-90%. Decide on carrying out waterproofing works in these interlayers. Selectively and pointervalue these interlayers pumped by 2 m3liquid water solution in fresh water. Conduct technology exposure for curing. Remove gamma logging curves before and after the waterproofing works. Determine that two interlayers decreased gamma-units to zero. Conclude the passage of water agent in these interlayers. In the third interlayer decrease in gamma-units occurred at 10%. Make a conclusion about the need to re-water events in the interlayer.

Reveal that in the three production sciophilinae flow distribution working agent in deposits in the interlayer.

The result of applying the proposed method, the recovery rate deposits increased by 3% and amounted to 41%.

The application of the method will determine obwodnica the interlayers and to increase the recovery rate deposits due to water shutoff.

The way of the development of oil deposits, including the injection of working agent through the injection wells, oil extraction through production wells, conducting gamma logging in wells and detection layers with characteristic properties, characterized in that the gamma-ray log curves is removed during operation of the wells in the studied wells combine the next and previous curves of gamma logging, build a curve of the difference between the values of gamma units subsequent and previous curve, the maximum difference between the values of gamma units take 100%, determine the dynamics and % change of gamma units in the areas of productive layers, accept, that movement of the brine weak when changing the gamma-ray units up to 25%, from 25% to 75% is the average, over 75% are intensive in the presence of dynamics watering judge the promotion of formation water into the well, in the watered interlayers perform isolation formation water and the alignment of the profile p is th change indicators gamma logging judge the passage of water agent water interlayers.

 

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FIELD: oil extractive industry.

SUBSTANCE: method includes electro-hydraulic treatment of bed at resonance frequency and extraction of oil from bed. According to invention bed is excited by resilient pulses at broad frequency range from 0 to 10 kHz. Frequencies are set, at which bed is treated. Resonance frequency is kept by singular, periodical, radially focused electro-hydraulic pulses with generation frequency, divisible by bed resonance frequency. Concurrently in adjacent well bed excitation frequency is controlled by resilient pulses and corrected according to measurements results.

EFFECT: higher efficiency.

2 dwg

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