Composition for improving of reservoir recovery

FIELD: mining engineering, in particular improving of reservoir recovery.

SUBSTANCE: claimed composition contains (mass parts): resin 100; liquid curing agent (e.g., alkali solutions) 15.1-60; ammonium carbonate 0.1-9.9. Composition of present invention afford the ability to limit the water and sand inflow, to increase strength and permeability of formed reservoir.

EFFECT: improved reservoir recovery, increased turnaround time, reduced underground equipment in well.

2 tbl, 4 ex, 2 cl

 

The invention relates to mining, and in particular to enhanced oil recovery.

A known structure for mounting weakly cemented collectors, which contains phenol-formaldehyde or urea resin, hydrochloric acid hydroxylamine and water (and. S. No. 968334, E 21 In 33/138, 1982).

The disadvantage of this structure is that its application does not provide sufficient permeability of the near well zone, and the additive in the resin 50% of the water greatly reduces the strength of the generated header.

Also known structure for mounting slaboshchelochnogo layer containing alkylresorcinol resin, hardener - paraform and mineral filler is sodium bicarbonate. S. No. 1760088, E 21 In 33/138, 1989).

The disadvantage of this structure is that when using sodium bicarbonate as a pore-forming (to increase permeability) requires additional pumping of acids, which leads to uneven porosity and lower permeability and strength formed by the collector, which ultimately affects the reduction in the productivity of the well.

The closest is the composition for fixing slaboshchelochnogo layer containing the resin, hardener-paraform, ammonium carbonate (A.S. No. 1596073, E 21 In 33/138, 1988, prototype)

The disadvantage of this structure is that used by the Xia powdered hardener, when using powdered hardener reduces the area of penetration of the insulation solution.

The depth of penetration into the formation of powdery curing agent is limited by the borehole wall and thereby significantly reduces the strength and permeability formed by the collector.

We offer composition for enhanced oil recovery is devoid of the above disadvantages, in addition, characterized in that allows you to increase oil recovery, i.e. increase well production by increasing the efficiency of operations to control water and sand, increasing the turnaround time as well as the reduction of underground equipment in the well.

The composition for enhanced oil recovery consists of resin, liquid hardener, and ammonium carbonate, where the liquid hardener use alkaline solutions, in the following ratio of components (parts by weight):

resin - 100

the liquid hardener - 15,1-60

ammonium carbonate - 0,1-9,9.

As liquid hardener use alkaline solutions, for example a solution of hexamethylenetetramine in formalin-modified carboxymethylcellulose and ethylene glycol, produced according to TU 6-05-281-22-89, a solution of urotropine, formalin solution.

As resins (products of polycondensation) is used, for example, finalreport.html agenoy resin grade FGF-RM, produced according to TU-6-05-1638-78 and get it by condensation alkylresorcinols faction, wikipeida at a temperature of +275/+290°; alkylresorcinol resin grade FR-100, produced according to TU-6-05-1638-78 and get it by condensation alkylresorcinols faction, wikipeida at a temperature of +275/+290° C.

Ammonium carbonate is a powdered mineral filler, blowing agent.

The composition for enhanced oil recovery prepared as follows.

In the resin, for example, the brand FGF-RM, mark FR-100 and other injected liquid curing agent (hereinafter referred to as RC) and ammonium carbonate in the above proportions, all the ingredients are mixed by mechanical means until a uniform distribution in the whole volume of solution.

Next, the prepared composition for enhanced oil recovery (hereinafter composition) upload, then push in the perforated interval of the well, having produced a temperature not less than +50°C or the desired temperature, which is created, for example, by a method of heating up.

Laboratory experiments were carried out at the unit of study permeability cores (wipk-1m) at room temperature. What was taken oil-saturated core was placed in kindergaten and simulated reservoir pressure side and frontal gidrokabina. On the Les in this sample was stored composition (resin with different ratio of coolant and ammonium carbonate) and the processed sample was aged in kindergaten under pressure of 10.0 MPa for 24 hours at a temperature of at least +50° C. Then measured the following parameters:

The CRC. for kerosene is an indicator of permeability formed by the collector, the greater the value, the higher the oil recovery;

Hardness - a measure of the strength formed by the collector, the greater the value, the higher the oil recovery.

The composition was tested in field conditions (wells).

For this purpose, the pump-compressor plant pipes, lowered to 5-10 m above the perforated interval, the method of direct circulation pump the prepared structure, bring up the boot booster pump pipes, close the annulus and push it into the perforation interval using the vehicle, for example, the separator liquid (kerosene, acetone), process fluid. At the end of produci leave a hole for the passage of the polycondensation reaction in the reservoir within 24 hours. After this time the well is completed.

On completion of the works measured the following parameters:

1. Watercut (%) - rate limiting eliminate cross-flows, less than % of the water content, the higher the oil recovery.

2. Hardness (MPa/cm2) - a measure of the strength of attachment of the reservoir, the greater the value, the higher the oil recovery.

3. The CRC. on kerosene (μm2·10-3), Q (m3/day) - pokazatel the permeability formed by the collector, the greater the value, the higher the oil recovery.

4. EHF (mg/l) - number of realized during many years of the particles, the smaller bear sand, the higher the duration of maintenance-free period of operation of the well and thereby increasing the oil recovery.

5. Q - oil-oil production rate (t/day).

The proposed composition was tested in laboratory conditions in industries and is illustrated by the following examples.

Example 1

Laborzentrifugen, oil-saturated core samples taken from the Barsukovskoe field was placed in kindergaten and created the pressure of 10.0 MPa at a temperature of +55° C. Then the sample was re-injected composition comprising the following components in the following amounts:

resin brand FGF-RM - 100,0;

formalin - 20;

ammonium carbonate is 0.1.

After 24 hours the sample had the following options:

The CRC. for kerosene is 0.001 μm2·10-3;

The hardness of 46 MPa/cm2.

This composition was tested at well # 3378 the Barsukovskoe field in the interval 1768-1770,5 m State well before the test:

Q=17 m3/day, the water content of 83%, Q=2.5 tons/day, EHF=200 mg/l Wells was stopped for reasons: high watering and education sandy tube in the trunk.

The tests were carried out as follows.

In the pump-compressor plant pipe (hereinafter tubing), launched deep into the well 1758 m, method of direct circulation pump of the above composition in the following amounts, kg:

resin brand FGF-50p - 1000;

formalin - 200;

ammonium carbonate - 1.

Brought the above composition to the tubing, closed annulus and pushed his process fluid into the perforation interval. The hole left for the passage of the polycondensation reaction in the reservoir within 24 hours.

In the result, the water content of the reservoir fluid is decreased, the oil production rate increased, i.e. received the following data:

The cut - 84%, Qn-5,8 t/d, EHF=77 mg/L.

Example 2

Laborzentrifugen, oil-saturated core samples taken from the Barsukovskoe field, were placed in kindergaten and created the pressure of 10.0 MPa at a temperature of +55° C. Then the sample was re-injected composition comprising the following components in the following amounts:

resin brand FGF-RM - 100;

formalin - 50;

ammonium carbonate - 5.

After 24 hours the sample had the following options:

The CRC. for kerosene - 112,3 μm2·10-3;

Hardness - 23 MPa/cm2.

This composition was tested at well # 3240 the Barsukovskoe field in the interval 1818-1824 m

The state of the well prior to the test:

Q=37 m3/d water cut - 84%, Qn=5 t/d, EHF=220 mg/L. Well be the and stopped for reasons of high water content and education sandy tube in the trunk.

The tests were carried out as follows.

In the tubing, down to a depth of 1808 m, the method of direct circulation pump composition in the following amounts, kg:

resin brand FGF-RM - 1000;

formalin - 500;

ammonium carbonate is 50.

Then brought the composition to the tubing, closed annulus and pushed his process fluid into the perforation interval. The hole left for the passage of the polycondensation reaction in the reservoir within 24 hours.

As a result of testing the water content of the reservoir fluid has decreased; the oil production rate increased:

The water content of 73%, Qn=5.1 tons/day, EHF=53 mg/L.

Example 3

Laborzentrifugen, oil-saturated core samples taken from the Komsomolsk field, were placed in kindergaten and created the pressure of 10.0 MPa at a temperature of +55° C. Then the sample was re-injected composition comprising the following components in the following amounts:

resin brand FGF-RM - 100;

formalin - 40;

ammonium carbonate - 8.

After 24 hours the sample had the following options:

The CRC. for kerosene - 70 μm2·10-3;

Hardness - 26 MPa/cm2.

This composition was tested at well # 4409 Komsomolsk field in the interval 1573-1586 m State well before the test:

Q=21 m3/day, Qn=16 tons/day, Obvodny the pursuit - 10%,

EHF=191,5mg/L. the Well was stopped because

education sandy tube.

The tests were conducted as follows:

In the tubing, down to a depth of 1563 m, the method of direct circulation pump composition in the following amounts, kg:

resin brand FGF-50p - 1000;

formalin - 400;

ammonium carbonate - 80.

Brought the composition to the tubing, closed annulus and pushed his process fluid into the perforation interval. The hole left for the passage of the polycondensation reaction in the reservoir within 24 hours.

As a result of the tests, the oil production rate increased, EHF fell:

The water content is 10%, Qn=18 tons/day, EHF=76 mg/l

Example 4. Laborzentrifugen, oil-saturated core samples taken from the Komsomolsk field, were placed in kindergaten and created the pressure of 10.0 MPa at a temperature of +55° C. Then the sample was re-injected composition comprising the following components in the following amounts:

resin brand FGF-RM - 100;

formalin - 60;

ammonium carbonate and 1.7.

After 24 hours the sample had the following options:

The CRC. for kerosene - 139 μm2·10-3;

Hardness - 19 MPa/cm2.

This composition was tested at well # 4463 Komsomolsk field in the interval 1557-1560 m

State well before the test is s:

Q=35 m3/day, EHF=179 mg/l, the water content of 28%, Qn=21 tons/day. The well was stopped because of education sandy tube.

Testing consisted of the following:

In the tubing, down to a depth of 1547 m, the method of direct circulation pump composition in the following amounts, kg:

resin brand FGF-RM - 1000;

formalin - 600;

ammonium carbonate - 150.

Brought the composition to the tubing, closed annulus and pushed his process fluid into the perforation interval. The hole left for the passage of the polycondensation reaction in the reservoir within 24 hours.

Well mastered by method of reducing the liquid level in the wellbore. As a result of the tests, the oil production rate increased, EHF fell:

The water content is 20%, EHF=63.5 mg/l, Qn=31,0 t/day. Just spent 45 experiments, the results of some experiments are presented in tables 1 and 2.

The given examples show that the introduction of the liquid hardener and concentration of components (ammonium carbonate 0,1-9,9 parts and liquid hardener 15,1-60 parts) satisfies the solution set for the proposed structure.

Presented in table 2, the data allow us to conclude about improving the performance of the reservoir - well production of oil has increased more than twice on average from 2 to 9 t/day that the call is lilo to get additional tens of thousands of tons of oil.

Use all of the components in the complex and within the specified limits provides increased permeability and hardness formed by the collector, which is intimately connected with the increase of flow rate, because the increase in strength of the collector allows you to increase the generated depression on the layer (without a significant increase of sand in the wellbore, the indicator EHF). Depression and the flow rate have a direct relationship, thus increasing the depression, we increase the flow rate, while increasing the permeability of the reservoir, we increase the rate of filtration of oil, which again leads to increased production of the well.

The amount of suspended particles (EHF) in reservoir fluid in all wells is less than 100 mg/l, this indicator allows the use of underground pumping equipment without additional filters, which increases maintenance-free period of operation of the well. For example, the use of protivopolozhnogo filter on pumping equipment contributes to the formation of sandy tube between the filter and the perforation interval.

High water content and the formation of sand tubes are the main reason for the stop and well workover and affects the productivity of the well (the Barsukovskoe and Komsomolsk fields 3-N-G). Ka is showed field tests, the application of the proposed structure allows you to successfully deal with these complications.

Collectively, increase efficiency by limiting water and sand in the well, increasing the flow rate by increasing the strength and permeability formed by the collector, increasing the turnaround time as well as the reduction of underground equipment in the well leads to increased oil recovery.

1. The composition for enhanced oil recovery, including resin, hardener and ammonium carbonate, characterized in that in use liquid hardener hardener in the following ratio of components, parts by weight:

resin 100

hardener liquid 15,1-60

ammonium carbonate 0,1-9,9.

2. The composition for enhanced oil recovery according to claim 1, characterized in that as the liquid hardener use alkaline solutions.



 

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2 tbl, 4 ex, 2 cl

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