Gas-emitting and foamable composition for intensification of oil and gas

 

(57) Abstract:

Foamable composition refers to the oil and gas industry and is used, in particular, for a smooth call flow of oil and gas from the formation with the well completion. The composition contains: wt. urea 1,0 13,0, nitrite, alkaline or alkaline-earth metal 4,6 59,7, the surfactant is 0.1 to 1.5, hydrazine or its derivatives 0 37.4% hydrochloric ammonium 0 24,6, CMC or PAA 0,1 1,5, water the rest. Use in the composition of hydrazine or its derivatives increases the yield of gaseous product and contributes to the process of formation of thermal energy. Glyoxylate and salt of the hydrazine hydrazine dihydrochloride initiated chemical interaction of urea with metal nitrite, and also has a mud acid effect on the bottomhole formation zone. Introduction to foam system a water-soluble polymer compounds contribute to the improvement of the characteristics of the foam and flotation properties, as well as allow you to apply the foamable composition in the form of a cylindrical briquettes. The composition is applicable to other processes of intensification of oil and gas. 2 C. p. F.-ly, 5 PL.

The invention relates to the oil and gas industry and can be used in cha is Kvasiny.

There is a method of drilling in a borehole replacement of downhole fluid foam in the perforation zone. Getting the foam is carried out by a chemical reaction of the gas in the interaction of sodium nitrite, ammonium chloride and organic acid in the presence of foaming (SAS). The disadvantage of using this method of producing foam is the high complexity of the process (preparation of special containers for descent organic acid-reaction initiator in the well).

Known self-adjusting foam system containing urea, nitrite, alkali or alkaline earth metal, an acid, methenamine, surface-active substance (surfactant) and water. As gasanalysis agent in the composition is an inert gas, nitrogen and carbon dioxide, resulting from the chemical reaction between urea and a metal nitrite in the presence of a reaction initiator acid:

(NH2)2CO+2NaNO2+2H+__+CO+2Na++3H2O

(1)

The disadvantage of this system is the low stability of the foam, resulting in low efficiency of the process of completion.

The aim of the invention is to reduce costs and increase efficiency is Oh, heat treatment of bottom-hole formation zone (PPP), and partial purification of downhole solids, sand, corrosion products and asphalt, resin and paraffin deposits (ARPD) and removing them on the surface due to the flotation forces of the foam.

This is achieved by the fact that well-known self-adjusting foam system for mastering wells containing urea, nitrite, alkali or alkaline earth metal initiator reaction (acid), a surfactant, and water, further comprises a foam stabilizer (flotation) carboxymethylcellulose (CMC) or polyacrylamide (PAA), salt of hydrazine hydrazine dihydrochloride, and as an initiator of the reaction pinacolato ammonium hydrodifluoride under the following ratios of the starting components, wt. Urea 1,0-13,0

Nitrite or alkaline

alkaline earth metal 4,6-59,7 Pinacolato 0-24,6 Hydrazine dihydro - chloride 0-37,4 CMC or PAA 0.1 to 1.5 surfactant 0.1 to 1.5 Water the Rest

Gasanalysis and foam formation occurs spontaneously upon mixing the starting components for any positive temperature. Chemical gassing reaction is highly exothermic.

The process of chemical interaction between the metal nitrite and hereditaria ammonium has the/BR>(3)

NH4OH+HNO2__ H2O+NH4NO2< / BR>
(4)

NH4NO2__ N+2H2O+Q1< / BR>
(5)

NH4HF2+2NaNO2__ 2NaF+N+2H2O+HNO2+Q1< / BR>
(6) the Decomposition azotistogo ammonium by the equation (5) occurs almost instantaneously allocates a large amount of thermal energy, about 300 kJ/mol. Scheme of interaction of metal nitrite with hydrazine dihydrochloride can be expressed as follows:

2(NH2NH22HCl)+4NaNO2__ 4NaCl+2HN3+4H2O+2HNO2< / BR>
(7)

2(H-N=N+=N-) __ 2H+3N+Q2< / BR>
(8)

2(NH2NH22HCl)+4NaNO2__ 4NaCl+H+3N+4H2O+2HNO2+Q2< / BR>
(9)

The decomposition of one mole of hydrogen azide according to the scheme (8) is allocated to 590 kJ of thermal energy.

Excess nitrous acid formed by the equations of chemical reactions (6) and (9), it can be eliminated by introduction of the urea, which when interacting with nitrous acid it forms an additional amount of the gaseous products and water:

(NH2)2CO+2HNO2__ 2N+CO+3H2O

(10) Nitrite metal is involved in the formation of gaseous products hydrovhloride ammonium (6) and the dihydrochloride omentum, enter the letter stoichiometric coefficients a and b in the equations of chemical reactions (9) and (6).

The General scheme of interaction between the source components is found by adding equations (6), (9) and (10) and has the following form:

NNl(

(11)

where a and b are the stoichiometric coefficients of a chemical equation;

m index the chemical formula of a molecule of the substance;

Me alkaline or alkaline earth metal;

Q Q1+ Q2thermal energy.

The contents of the source components in the proposed composition is determined by the ratio of hydrovhloride ammonia to hydrazine dihydrochloride and Vice versa, therefore, depends on the numerical values of the coefficients a and b in the chemical equation (11).

Pinacolato hydrolittoral ammonium as a result of hydrolysis (2) to form hydrofluoric acid, which is capable to react and loosen carbonateagnesium rock formation.

The introduction of the foaming agent (surfactant) and water-soluble polymeric compounds of the type CMC or PAA improve the stability and flotation properties of the foam. These physico-chemical properties of the foam are significantly improved when the content in the gas-emitting polymeric compounds googlemania water rocks reservoir, lower razbuhavshie clay and to ensure deeper penetration of the acid into the formation, thus increasing the efficiency of processing bottom-hole formation zone.

Polyacrylamide is capable of reacting with nitric acid allocation of inert nitrogen gas, resulting razbuhayet polymer increases, therefore, polyacrylamide, this structure is able to perform another additional feature DAB of high-permeability zones of the reservoir. As usual, highly permeable interlayers most oil fields are vodoplavayuschim areas that need to be isolated and DAB.

Consider the special case of the interaction of sodium nitrite with a substituted derivative of hydrazine in acidic environment. The scheme of interaction between them is as follows:

RNH-NH2+NaNO2+H+__ RN3+2H2O+Na+< / BR>
(12)

2(R-N=N+=N-) __ R-R+3N+Q

(13) where R is a hydrocarbon residue (alkyl, aryl) radical. Azide hydrocarbons are more stable than hydrogen azide, their decomposition also comes with heat. The azide decomposition of hydrocarbons is accompanied by the discharge of highly reactive radical, which when interacting with others for whom then is the end product of the chemical interaction will be nitrogen, water, salt and sodium octane is a hydrocarbon solvent.

Using the proposed gas-emitting and foaming the composition derivatives of hydrazine allows you to get as a final product:

when N-substituted hydrazine gaseous substance and a hydrocarbon compound in a good solvent paraffin content in the radical of carbon atoms from 1 to 5;

when N, N'-substituted, in contrast to N-substituted, optionally alcohols or ketones.

In wells, complicated by sediment deposits in the underground equipment and in the bottomhole formation zone, preferably used in the proposed composition of hydrazine derivatives, as its solvent, and removing the ability of paraffins is much higher and the efficiency of development wells sharply increasing.

Technology is the practical application of the proposed structure provides several ways of implementing technological operations on the well completion.

The efficiency of development wells is achieved by compliance with the process due to inoperability and heat treatment of bottom-hole formation zone: creating a depression in the reservoir, replacement of the well fluid from downhole to the Ust is logo the amount of heat and the chemical interaction between the components of the foamable composition flows at the well bottom, when acidic foods are completely neutralized. Well after entering the proposed composition close to the reaction and incubated for 1.0 to 1.5 days, and then release the excess pressure in the oil storage reservoir. Non-Newtonian properties of the foam due to the elastic forces allow you to smoothly decrease the static pressure of the column of well fluid and to create a smooth call flow of fluid from the reservoir.

Foam stabilized with a polymer capable of endure while on the surface the mud acid products processing and partially to clear the borehole bottom by flotation.

The first method. Produced at the wellhead or stationary aqueous solution containing urea, nitrite, alkaline or alkaline-earth metal, a surfactant, and part of the water-soluble polymer compound and bring it to the borehole bottom. The reaction initiator is prepared in the form of a cylindrical briquettes, made from a doughy mixture containing 5,0-20,0% aqueous solution of polymer, pinacolato and hydrazine dihydrochloride. The estimated number of briquettes consistently throw inside tubing (tubing) through the gland-lubricator installed on the wellhead. The sequence is part of the foamable composition, contains urea, nitrite metal and surfactant, and initiator of the reaction, is prepared in the form of briquettes and brought to the well bottom as in the first method.

The third way. Foamable composition is prepared in the form of two finely dispersed aqueous solutions with higher density of 1.00 g/cm3< / BR>
solution 1 contains pinacolato (hydrolittoral ammonium, hydrazine dihydrochloride, foam stabilizer (CMC or PAA) and water;

solution 2 is prepared on the basis of an aqueous solution of polymer (CMC or PAA) by dissolving therein urea, nitrite metal and surfactants.

The obtained solutions sequentially with an interval of 1.0 to 1.5 h, brought to the borehole bottom. The loss and displacement of the solutions to the borehole bottom is due to the gravitational forces of the solution and due to the products of chemical interaction between the components of the two solutions of gases and foam. Not excluded the possibility of the use of buffer fluid (oil) between the solutions.

Offer foamable composition allows to master production and injection wells in operation and going out of the drilling or after carrying out the repair work.

P R I m m e R. Foamable composition is prepared in the form of two solutions p. aboratory installation model well fill 10-15% of its height oil with a density of 0.88 g/cm3or kerosene with a density equal to 0.80-0,82 g/cm3and consistently give her the solutions proposed composition.

Solution 1 contains in its composition hydrolittoral ammonium, hydrazine dihydrochloride, CMC and water.

Solution 2 is prepared by dissolving 2.0% aqueous surfactant solution (sulfinol NP-3), urea, sodium nitrite and CMC.

The stoichiometric ratio of initial gas-emitting components of the composition are calculated according to chemical equation (11), where the equation coefficients a and b are found from the ratio of the concentration of hydrovhloride ammonium and hydrazine dihydrochloride in solution.

Weight content (in g) and the ratio of initial components (wt.) in these solutions are given in table. 1. In table. 1 also includes the volume ratio of solution 1 and 2 for the preparation of foamable composition and the results of laboratory studies (foam, the temperature of the mixture).

The boundary conditions of the ratios of the starting components are dependent on the weight ratio of the starting components, i.e. hydrovhloride ammonium and hydrazine dihydrochloride, stehe the interaction between the reagents may be accompanied only by pinacolato (hydrody - ammonium fluoride) or only the hydrazine dihydrochloride. When the contents of one of the initiators of the reaction in the initial composition is zero, then the lower boundary condition is the ratio of the components in the composition when the concentration of the initiator chemical reactions satisfactory to obtain a foam ratio above 4.0 at a temperature of 20aboutC.

Chemical reaction (11) when the coefficients a 0 and b 0 has a single solution for each initiator reaction.

In table. 2 shows the results of laboratory tests of the proposed composition that does not contain one of the initiators. The concentration of hydrovhloride of ammonia in the composition should be greater than 4.0 wt. and of hydrazine dihydrochloride higher than 4.5 wt.

The preparation of the proposed foamable composition of the briquettes, two mortars or mortar and bricks determine the boundary conditions of the ratios of the components (table. 3).

Briquettes (rods) are prepared on the basis of structure-forming water-soluble polymeric compounds of the type CMC or PAA concentration of 5.0-20.0% in aqueous solution. The rest are the initiators of the reaction rods brand And and other other components rods B.

The upper boundary conditions (wt.) briquettes and the processes of the obtained results of laboratory tests of the proposed structure allows to use it for receiving the gaseous products of nitrogen, carbon dioxide and hydrogen, and with the introduction of the foaming agent (surfactant) foam. Composition allows you to adjust the multiplicity and stability of foam, as well as to improve the flotation properties of the foam due to the supplementation of water-soluble polymer compounds.

The preparation of the proposed composition in the form of a cylindrical briquettes expands the scope of its application, for example, for the development of remote exploration wells, obtaining foams. Gasanalysis and foam for this group occurs with the release of a large amount of thermal energy, therefore, the composition is suitable for implementation teplofizicheskoi the bottomhole zone treatment and enhanced oil recovery of high-viscosity oil, as well as for extraction of residual oil, but the late stage of oil field development.

Pinacolato in this part at the same time performs the function of the initiator of the reaction and is a reagent for impacts on mountain reservoir rock (clay, carbonates, sand and so on).

The composition containing as polymer polyacrylamide, allows to use it for a more complete isolation vodopodayuschih zones of the layer and change the injectivity profile than foam.

aktov chemical interaction between the components of the hydrocarbon solvents asphalt substances. The gaseous product of the interaction of hydrogen allows the use of the composition for the recovery of the oxidized form of the substance, for example for the regeneration of spent glycol in compressor stations.

The introduction of the proposed structure for the processes of intensification of oil and gas using foam economically feasible and advantageous in comparison with other known methods.

In the composition instead of sodium nitrite can be used nitrites other metals, instead of hydrohloride ammonium other glyoxylate, instead of the urea salt thereof. The formation of foam in these cases is not significantly different. Examples of preparation and use of such foamable compositions are essentially similar, the difference is only in quantitative proportions of the interacting components.

The proposed source components to obtain a gas-emitting and foaming composition cheap and available, do not require special conditions during the transportation and storage industry produces large capacity and are widely used.

1. Gas-emitting AND FOAMABLE COMPOSITION FOR INTENSIFICATION of OIL AND GAS containing urea, ng, characterized in that it additionally contains a stabilizer foam /flotation/, hydrazine or its derivatives, and as an initiator of the reaction pinacolato in the following ratio, wt.

Urea 1,0-13,0

Hydrazine or its derivatives 0-37,4

Nitrite, an alkaline or alkaline-earth metal 4,6-58,7

Pinacolato 0-24,6

The foam stabilizer (flotation) 0.1 to 1.5

SURFACTANT 0.1 TO 1.5

Water the Rest

2.Composition under item 1, characterized in that as glyoxylate it contains hydrolittoral ammonium, and as a foam stabilizer (flotation reagent) water-soluble polymer compound carboxymethylcellulose (CMC) or polyacrylamide (PAA).

3. Composition under item 1, characterized in that as hydrazine and its derivatives contain N - or N,N-substituted derivatives of hydrazine or hydrazine salt of hydrazine dihydrochloride.

 

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