The composition for treatment of free water formation waters potassium chloride and harmegnies type of bottom-hole zone of carbonate productive formation

 

(57) Abstract:

The composition for treatment of free water formation waters potassium chloride and harmegnies type of bottom-hole zone of carbonate reservoir, containing the following ratio of components, wt.%: ammonium bicarbonate 11,5 - 25,0, surfactant flotation VIS - VAT residue production of higher fatty alcohols, 1,5 - 5,26 and water - the rest. 3 tables, 1 Il.

The invention relates to gazoneftedobyvayuschie industry, chemical processing methods of critical areas of productive layers, more specifically to the use of reversible reactions double exchange (A. T. Pilipenko, V. I. repairings, I. P. Wednesday, F. A. Shevchenko. Handbook of elementary chemistry. Kiev, Naukova Dumka, 1984, S. 20-21), in contrast to the means of hydrochloric acid treatments, which is the irreversible decomposition reactions of acids with separation of CO2and education madisonyoung compounds such as H2O.

You know the phenomenon of leaching of sulphate (mainly anhydrite (carbonate) calcium) minerals and silica from the reservoir rocks by injecting fresh or fresh surface waters (journal "Petroleum engineering", 1979, S. 22-23x2">

Special treatments of carbonate rocks-collectors on the principle of reversible reactions double exchange in the scientific and patent licensing literature us is not installed.

The closest in technical essence to the proposed composition is the composition of removal technology scaling using ammonium hydrogen carbonate (carbonic acid) NH4HCO3and ammonium carbonate (carbonic acid) (NH4)2CO3[1]

Object of the invention is the use of this reagent (electrolyte) for impacts on carbonate rock reservoir with subsequent removal of the reaction products during the development of the well and thus increase the permeability of the bottom-hole formation zone (PPP) and the reaction is the reaction of the electrolyte with the carbonate reservoir.

For the technical solution to the problem in the known method of removing technological scale, including the use of the electrolyte presents an aqueous solution of bicarbonate of ammonium carbonate, capable of interacting with carbonates according to the invention, in the bottom zone, free from the irrigation reservoir water potassium chloride and harmegnies nerastvorim carbonates of calcium and magnesium reservoir soluble in ammonium carbonate and bicarbonate of calcium and magnesium.

The second difference is that for the reaction is the reaction of the electrolyte with a carbonate reservoir, the electrolyte is treated with a mixture of nonionic and anionic surfactants (detergents), for example by flotation VGS (VAT residue of higher fatty alcohols of complex composition), in the following ratio, wt. the electrolyte (solution of bicarbonate of ammonium carbonate) 11,50 25 detergents, such as flotation VGS 1,50-5,26, water the rest.

In place of insoluble carbonates reservoir (chalk, limestone, dolomite), translated in soluble electrolytes and removed during the development wells, are formed additional channels dissolution, increasing the permeability of the PPP and, consequently, the productivity of the well.

When watering reservoir waters potassium chloride and harmegnies type of the proposed method is undesirable due to temporary partial blockage of productive strata formed during the reaction the precipitate chalk. The chalk formation is caused by the active interaction of chloride ions produced water from amine groups, ammonium bicarbonate with the formation of ammonium chloride and chalk.

What is happening reversible chemical reactions double exchange between e CO3+

+ Ca(HCO3)2< / BR>
MgCO3+ 2 NH4HCO3(NH4)2CO3+

+ Mg(HCO3)2< / BR>
(MgCa)CO3+ 2 HOH + (NH4)2CO3< / BR>
MgCa(HCO3)2+ 2 NH4OH Flotation VIS VAT residue of higher fatty alcohols can be found in the original solution during the purification of natural gas from the carbon dioxide by ammonia method to achieve greater efficiency of gas purification, in which there is life (bicarbonate and carbonate) ammonium. But to solve the task it is specifically introduced into an aqueous solution of ammonium bicarbonate in the amount of 1.50 5,26 wt. regardless of the method of obtaining the latter. Here he plays the role of catalyst above the reversible reactions of double exchange. The degree of influence of flotation reagent VGS on the solubility of carbonate reservoir in a solution of ammonium hydrogen carbonate are given in table.2 (example 2).

The composition of the flotation reagent FGS (wt.) below:

NaOH is not less than 0,5/0,8 1,6%

Fatty acids not less than 40 with respect to the organic part,

Unsaponifiables 15 24

Indicators Mileena part of the Unsaponifiable portion of the Acid number 160-186 3-5 Essential number 40-70 Carbonelle number 30-40 26-40 Iodine cronovich

acid Content of 20-30 monocarb-

new acid 20-30 Content of alcohols:

monoparty 50

diols 30-25

The physical properties of the flotation reagent WIS. At a temperature of 20aboutWith is a dark brown oily liquid with a density of 1.06 g/cm3beginning thickening 0aboutWith the beginning of the boil 100aboutC. comparative analysis shows that the proposed composition differs from known as on purpose (known to remove technological scale proposed for impacts on carbonate rock reservoirs), and the processing reagent (electrolyte) a mixture of nonionic and anionic surfactants (detergents), for example by flotation VGS, amplifying the response reaction of the reagent with the carbonate reservoir. Analogue, the most commonly used in the oil and gas practice for impact on carbonate rock reservoirs, based on the principle of reversible reactions double exchange, as noted above, we in the scientific and patent licensing literature is not installed.

Therefore, the proposed structure is a priority. In addition, it is simple, does not cause corrosion of equipment, because the solution bicar the arc capacities, less toxic than HCl and, therefore, more environmentally friendly, which taken together correspond inventive step.

The drawing shows the dependence of the solubility used in the proposed composition of the reagent, ammonium bicarbonate, the solution temperature.

Apply the composition in the following way. First produced preparatory work. Selected for intense qualification well investigated to determine its productive characteristics, i.e., measured daily rate gas daily removal of condensate and water in one (working) or more additional modes. If the well is equipped with a packer, the pre-open circulation valve (CZ) for connection to the tube and the annulus below the tubing Elevator. Then the well is put on the recovery of static pressure or served in the train bore high-pressure gas from other wells. Then the work intensification. In the bottom zone of the well, free from the irrigation reservoir water potassium chloride or harmegnies type through a pipe or the annulus is pumped without leakage of gas from wells estimated number of reagent at a rate of 0.1-0.5 m3

The method is as follows.

P R I m e R 1. The implementation of the composition in a laboratory setting.

In the laboratory on standard laboratory equipment were prepared samples of sandstones (16 pcs. cylinders) for studies of the cores of oil and gas fields in the Dnieper-Donets basin (DDB).

Gas analyzing method was determined initial carbonate content of core material.

Samples of sandstones 16 pieces with a diameter of 30 mm, a length of 30 mm, the absolute permeability (51 1326) x 10-15N2(51 1326 MD) and an open porosity of from 9.5 to 22.7 Extraction was conducted to conventional Soxhlet extractions, exemption from moisture in the IPA BODIES 200, pilotnist fluids was determined by pycnometry volume of 50 ml, the viscosity by capillary viscometer MIC-3 with an inner diameter of the capillary of 0.56 mm

By well-known methods in a laboratory setup wipk providing the dosage of fluid under a certain pressure and measured pressure standard pressure gauges, measurement of volume and flow rate of the displaced and the supplied fluid by measuring the burette and gas drum hours, through the core samples was pumped aqueous solution of bicarbonate (ammonium bicarbonate) mixed with ammonium carbonate concentration of 19 wt. and a temperature of + 20aboutC. After extraction and drying gas analyzing method was determined end carbonate content of core material sample cores.

Results definitions and changes in carbonate content are given in table.1.

From the data table.1 shows that out of 14 measurements in only two measurements (6, 10) carbonate content has not changed, but all other measurements of the carbonate content of the samples after treatment with a solution of bicarbonate (bicarbonate) decreased. Thus, here we can confidently judge unequivocal positive result of laboratory tests confirming the presence of reversible chemical IAATO proves the expediency of application of the aqueous solution of bicarbonate of ammonium carbonate as a composition for treatment of bottom-hole zone of carbonate reservoirs.

The drawing shows the changes in the content of ammonium bicarbonate in water solution.

Boundary content of hydrogen carbonate (bicarbonate) ammonium in aqueous solution is determined, on the one hand, the usefulness of the highest possible concentration of the reagent. On the other hand the contents of the reagent in the solution is due to the dependence of the reagent from the solution temperature (Winchell, A. N. Winchell, Optical properties of artificial minerals. M. Mir, 1967, S. 528). With third parties the fact that ammonium bicarbonate is not very firm and at atmospheric pressure in the temperature range 39 60aboutWith starts partially enter ammonium carbonate, and partially to decompose into ammonia and water.

Chemical decomposition reaction of the following:

2NH4HCO3(NH4)2CO3< / BR>
(NH)CO3H2O (NH4)2CO32NH3+H2O+CO2time.

In the reservoir when reservoir pressures ammonium bicarbonate more sustainable. Then the boundary of the content of ammonium bicarbonate, based on the utility of its possible high concentration in solution will be determined boundary temperature solution preparation, sampling the solution in the tank truck for delivery to the well and sakagura will correspond to the boundary of the content of ammonium bicarbonate 11,5 25 wt.

P R I m m e R 2. The authors have investigated the solubility of chalk in a solution of ammonium bicarbonate without treatment and with treatment by flotation WIS. Flotation was introduced specifically into the pre-prepared solution of ammonium bicarbonate. The solution temperature was 20aboutC. the Degree of solubility of the chalk was determined using the standard method of measuring ion concentrations of CA++, mg/l, go into solution.

The research results are summarized in table.2.

From the data table.2 shows that the solubility of calcium carbonate at processing bicarbonate of ammonium flotation VIS in the amount of 3.0 wt. (optimal concentration) increased 2.3 4.7 times that the main chalk dissolution is carried out in the first 6 h, and that the optimal concentration of the flotation reagent VIS you can take a 3 wt. Then the boundary and the optimal concentration of the flotation reagent VGS when the temperature of the solution of ammonium bicarbonate 20aboutAnd 6-hour exposure of wt. minimum of 2.5, a maximum of 4.0, the optimum of 3.0. When the boundary of the minimum and maximum temperatures of a solution of ammonium bicarbonate, respectively 5 and 35aboutWith the concentration of the flotation reagent WGS will change proportionally to the change in the concentration to testout specified in the table.3.

P R I m e R 3. The application of the composition in field conditions on the sample wells N 5 Raspasovschika GCF Poltava gas production management.

Geological-technical characteristics of the well.

Production column diameter 146/140 mm 4286 m, two-section, cemented in intervals 4283 3576 m, 2340 0 m, pressure-tested at 25/50 MPa, sealed. Artificial slaughter 3871 m perforation Interval: 3852 3815 m, drill the PCB 80. The productive horizon H-4 presents limestone, porosity 12 17

Suspension tubing with a diameter of 73 mm, 3809 m

Wellhead equipment 4 AFK 50-700

Well commissioned 31.12.1976,

The initial parameters of the well made:

PPL46,84 MPa, Q g A. C. to 541.5 millennium. m3/day.

Work well production in January 1977, was $ 102 thousand m3/day, but already in February m-n decreased to 10 thousand m3/day. In October m-n re performable hole PR-54 in the interval 3852 3831 m Current options well:

PPLare 11.62 MPa, Particlea total of 8.74 MPa (from 14.11.1990,);

PTr3.9 MPa, PZAT5.9 MPa, t + 12aboutC;

Qg31 thousand m3/day (from 18.09.1990 g).

Submitted fresh water, Q 1,0 g/cm3.

The working pressure was: PZAT459 MPa, PTr2,2 MPa, Punit= 2.0 MPa.

The flow rates were:

the device BCA-734 Qg14250 m3/day.

processing the ARCS Qg21770 m3/day.

In the well was pumped 8 m3solution of ammonium bicarbonate optimal concentration and the perforated gas from wells high pressure (up to 8.2 MPa) in the bottom zone for reaction c carbonate sediments of the reservoir manifold. After 1.5 h the forcing and response of the well was developed, tested on the torch the barn and put in the work unit.

Because of congestion on the bottom of the reagent solution injected in the processing layer and the products of the reaction wells were periodically tested on the torch, then to the collector.

After processing and purification, well she was prosledovala on productivity the measurement of flow field flow meter DSS-734 and stop well at gaging static pressure with the removal of the ARCS and the determination of the flow rate of the processing of the ARC.

The working pressure was: PZAT.with 3.27 MPa, PTr.2,3 MPa, Punit2.0 MPa.

The flow rates were:

the device BCA-734 Q 40180 m3/day.

by processing the m to the intensification of 2 to 3 times, namely, by measuring the BCA-734 (40180 m3/ d: 14250 m3/day) 2.8 times, by definition, processing the ARCS in (42680 m3/day. 21170 m3/day) 2.0 times.

From the comparison of the flow rates before and after intensification implies that the permeability of the bottom zone of intensifying significantly increased, which expresses the efficiency of intensification.

Industrial applicability the present invention is determined as follows:

used reagent bicarbonate ammonium carbonate is produced directly on the gas-fields as a byproduct of the purification of natural gas from the carbon dioxide;

reagent nekorrozionnostoykie, eco-friendly; surfactants used for effective cleaning of gas and developments reagent nedorogostoyathij; technology treatments uncomplicated, in particular the cleaning of the bottom zones of gas wells from contamination and fluid by conventional blowing on the torch.

The invention is of considerable interest for the national economy, as it provides additional production of gas and condensate, as in the case of the use in oil wells and oil; ensures cost reduction on work intensification, and, therefore, nia FORMATION WATERS potassium chloride AND HARMEGNIES TYPE of BOTTOM-hole ZONE of CARBONATE RESERVOIR, containing ammonium bicarbonate and water, characterized in that it additionally contains a surfactant flotation VIS - VAT residue production of higher fatty alcohols in the following ratio, wt.%:

Ammonium bicarbonate - 11,50 - 25,00

Surfactant flotation VIS - VAT residue production of higher fatty alcohols - 1,50 - 5,26

Water - The Rest

 

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