Foam forming composition for productive stratum perforation

FIELD: oil and gas production industry, in particular two-phase foam forming composition for secondary development of clay grouted stratum with non-uniform permeability by perforation under abnormal law stratum pressure.

SUBSTANCE: claimed composition contains foam forming agent, inhibitor, solvent and water. Bone glue in amount of 4-6 mass % is used as foam forming agent and inhibitor, sodium or potassium hydroxide in amount of 0.2-0.5 % is used as solvent, and balance: water. Composition of present invention makes it possible to produce foam with increased order, stability, inhibiting properties, low filtration factor, improved holding properties and to keep integrity of casing string and cement ring.

EFFECT: increased efficiency of secondary stratum development by perforation.

9 ex

 

The invention relates to the oil and gas industry, in particular foaming compositions of two-phase foam secondary opening heterogeneous permeability seal off formations perforation in the conditions of abnormally low formation pressure (anpd).

Analysis of the existing state of the art showed the following:

- known composition foam for perforation specified in the method of drilling the well, containing the following components, wt%:

Ammonium chloride 19,4

Sodium nitrite 23,6

The foaming agent is a sulfonic acid NP-3 2,1

Water 54,9

Sulfamic acid 0,029,

(see A.S. No. 1273508 from 27.11.1984, CL E 21 In 43/00, publ. in No. 44, 1986).

The disadvantage of this structure is the low efficiency of the secondary reservoir perforation. This is due to the following reasons: as a result of interaction of components of the specified structure is formed of two-phase foam with low stability. The method of formation of foam based on the release of gaseous agent (nitrogen) as a result of chemical reactions

NH4Cl+NaNO2NaCl+H2O+N2.

This so-called condensation method foaming. The mechanism of formation of such foam complicated, due to the influence of many factors. Mandatory condition for receiving foam condensation is the principal method is accurate count of reagents, reacts. If sodium nitrite is taken in equivalent proportions or in excess compared with ammonium chloride, forming the oxides of nitrogen toxic and corrosive substances that form in aqueous solutions of nitric and nitrous acid. The high rate of syneresis (leakage of fluid from mezhplanetnogo space in the foam) foam without stabilizer leads to a rapid increase in the volume of the liquid phase even in a period of intense reaction (about 30 minutes). The obtained two-phase foam does not have the necessary viscosity due to the absence of the stabilizer, increasing the viscosity of the composition, would slow down the leakage of liquid from the foam. The specified effect of reducing the stability of foam. In downhole conditions this will lead to a rapid increase of the level released from the foam liquid phase and a sufficiently long time the process of secondary reservoir perforation will occur in the aquatic environment of the composition. Is the penetration of water into the perforation tunnels and the formation of a zone of reduced permeability around the perforations. Not having sufficient viscosity, the foam is not able to withstand the shock waves produced when shooting perforations, which in turn violates the whole the integrity of the casing and cement sheath and as a consequence annular and annular floodproofing, in which part of the reservoir fluid is supplied not at the bottom of the borehole, and into the space between the casing pipe and the borehole wall, is his irrevocable loss. To eliminate floodproofing needed more repairs. Formed from the above composition, the foam does not have any abscopal high properties with respect to the clay component of the collector, as the amount of salt sodium chloride, resulting from the interaction of ammonium chloride and sodium nitrite, is not enough to cation exchange with molecules of clay particles. The function of the electrolyte is sodium chloride in maintaining the stability of the obtained foam. However, the low stability of the foam, since the electrolyte is still involved in cation exchange with clay particle collector. This foam is not able to hold products, polluting the perforation tunnels. The content of sulfamic acid in the composition is not sufficient for cleaning decolletee bottom-hole formation zone from penetrating into the formation of residues after perforation. The foregoing leads to the deterioration of hydrodynamic connection hole and the reservoir;

- known foamable composition environment for conducting postilochnyh works with the following components, wt%:

Acetylcellulose (TEV)

or carboxylic oxyethylcellulose (CMOAT) 0,2-1,0

The starch of 0.05-3,00

Potassium chloride or sodium or calcium 1,0-20,0

Surfactant is 0.1-0.5

Water the rest,

(see A.S. No. 1724671 from 11.05.1989 on CL 09 To 7/02, publ. in No. 13 of 07.04.1992 year).

As the surfactant composition contains a sulfonic acid and/or the condensation products of mono - and dialkylphenols, alkyl-polybutylene with ethylene oxide OP-10 and/or by-product of the production of isoprene from isobutylene and formaldehyde T-80 and/or the connection of potassium methyl siliconate NGL-10 and/or modified amino-paraffin ANP-2.

Explore only briefly-active substance acts as a foaming agent, TEV or CMOAT - stabilizer, potassium chloride or sodium or calcium - inhibiting reagent.

The disadvantage of this structure is the low efficiency of tailing-in of perforation. This is due to the following reasons: formed from the specified composition of the two-phase foam is not sufficiently high foaming ability (multiplicity) and stability (see other No. 14 act test).

This is due to the fact that, firstly, when using the components in the specified amounts, namely foaming agent is 0.1-0.5%, and electrolytes - these chlorides to 20%, typically suppress the foaming process, secondly, the presence of two polymeric reagents (TEV Il is CMOAT and starch) contributes to the dilution of the composition, so the resulting foam has no viscous mezhplanetnoi structure, thereby decreasing the strength of the foam film and increases the speed of the expiring fluid, increased capillary pressure in the channels of the Gibbs-Plateau and the diffusion rate in the foam deteriorates foaming is reduced ratio, and decreases the stability of the foam. All this will lead to the fact that a large part of the perforating work will be done already in the aquatic environment, which will lead to the violation of the integrity of the casing deformation of the cement sheath, will reduce the permeability of the reservoir, and the deterioration of hydrodynamic connection hole and the reservoir. The foam must have certain rheological properties to mitigate the impact of shock waves generated during the shooting of guns, which in turn contributes to maintaining the integrity of the casing and cement sheath, and will reduce the penetration into the perforation tunnels foreign particles and decomposition products of explosives punch, keeping them in the state realized during many years. Low viscosity characteristics of the obtained foam does not provide the above.

The foam formed from the specified structure does not provide a high inhibiting properties with respect to the clay component of the collector and delllatitude effect on PR the bottomhole zone of the reservoir wells. By inhibiting properties should be affected as existing in the recipe polymers, and potassium chloride or sodium or calcium. However, it does not provide an effective inhibition (see other No. 14 act test) because of the content of these chlorides - electrolytes to 20 wt.%. With the high electrolyte content of the polymer (TEV or CMOAT) is not able to sagemath water, and stabilization - inhibition clay particles breeds productive layers in the presence of polymer, improves as the polymer saguday aqueous phase. Because the system is not strongly bound water, it is easily filtered into the reservoir and hydrated clay component of the collector, which in turn collateral the reservoir, thereby compromising the filtration properties of the formation. Low indices of inhibition caused by the fact that the molecules of the electrolyte involved in the formation of adsorption layers of bubbles of the foam, i.e. positive and negative ions are associated with surface-active substance and CMOAT in building a fragile adsorption layers of bubble foam, but not in the cation exchange linistry component collector. Formulation composition does not provide decollatura properties. Fine particles of starch, not involved in the process of solvation with water molecules penetrate deeper inside p is rporation channels. All this negatively affects the natural permeability of the reservoir, there is a violation of hydrodynamic connection hole and the reservoir;

as the prototype was taken foamable composition for perforating productive strata containing the following components, wt%:

The chloride of the alkali or alkaline earth metal 0-50

Inhibiting salt 0,1-10,0

Organic solvent 0,1-10,0

Water-soluble surfactant of 0.1-0.3

Water the rest,

(see RF patent №2188843 from 23.07.2001, CL 09 To 7/06, E 21 In 43/12, publ. in No. 25, 2002).

As a water-soluble surfactant is used mainly neonol AF9-12, OP-10, neprinol VVD or sulfonic acid. The surfactant acts as a foaming agent. As the organic solvent used mainly alcohols or glycols, ethers based on them, acetone, or hydrocarbons, as inhibiting salt is ammonium chloride, or potassium chloride, or compounds based on them.

The disadvantage of this structure is the inefficiency of the secondary reservoir perforation. This is due to the following reasons: formed from the proposed composition of the two-phase foam is characterized by a low multiplicity and stability. Used in the composition of the organic solvents are defoamers, which reduces the multiplicity and stability of the formed foam. N is SCA foam stability due that the composition does not contain a stabilizer which increase the viscosity, thereby preventing the leakage of liquid from the foam. Due to the recent will be filtering into the reservoir, and as a consequence will reduce formation permeability. Derived from the specified composition of the foam does not have the necessary rheological properties, which does not provide holding capacity. This foam is not able to reduce the influence of shock waves generated during perforation. Consequently disrupted the integrity of the casing and cement sheath deteriorates the hydrodynamic coupling hole and the reservoir.

Inhibitory reagent composition represented by salt - potassium chloride or ammonium chloride, does not provide a high level of inhibition of the clay component of the collector. This is due to incomplete cation exchange between the inhibiting reagent and clay particles as the presence of organic solvents does not allow them to fully participate in cation exchange, and as a consequence decreases the degree of their hydrophilicity, which leads to the swelling of clay particles. Only slightly organic solvent participates in decolletee. A large part of the hydrated clay collateral pores of the formation. This leads to the violation of the deterioration of hydrodynamicist the second communication hole and the reservoir.

The technical result that can be obtained by carrying out the present invention, is as follows:

- increases the efficiency of the secondary reservoir perforation through the use resulting from the proposed composition of the foam with high multiplicity, stability, high any abscopal properties with respect to the clay component of the collector, low values of the rate of filtration, superior holding capacity and decollimation properties, allowing to improve the hydrodynamic coupling hole and the reservoir and which will preserve the integrity of the casing and cement sheath.

The technical result is achieved by using known foamable composition for perforating productive strata containing the foaming agent, inhibiting reagent, solvent, and water, characterized in that it as a foaming agent and inhibiting reagent contains bone glue, and the solvent is sodium hydroxide or potassium in the following ratio, wt.%:

Bone glue 4-6

Sodium hydroxide or potassium 0,2-0,5

Water the rest.

The inventive composition meets the condition of “novelty.”

Use bone glue on GOST 2067-93, sodium hydroxide according to GOST - 4328-66, potassium hydroxide according to GOST - 4203-65.

To the STN glue a protein product of the processing of the bones and tendons of animals. Amino acid and elemental composition of bone glue close to the collagen.

Elemental composition of bone glue, %:

50-55

N 6,5-7,3

N 15,0-17,6

O a 21.5 to 23.5

S 0,3-2,5

Mass fraction of moisture,%, not more than 17

Mass fraction of total fat,% not more than 3.0

Mass fraction of ash,%, not more than 3.5.

Hydrodynamic connection between the well and the reservoir is created primarily through the perforation of the casing string.

Secondary opening of the productive formation perforation is one of the important processes in the system of measures on completion.

As with the opening of the reservoir by drilling, perforation should be performed under conditions precluding penetration into the formation of large quantities of filtrate and washing liquid. The quality of the fluid that fills the column before perforation, and the amount of back pressure on the reservoir must ensure the preservation of the natural permeability of the bottomhole zone. The disadvantage of the existing practice of conducting perforation is that the liquid used in the perforations penetrate through the channels in the bottom-hole zone and significantly affect the filtration properties of the formation. In addition, upon completion of the formation of the channel by punching him in rush decomposition of the active part vzryv the mentioned substances punch, which may contain particles of plasticizer explosives (paraffin, graphite, resin and so on). In the channel can be inserted pieces of annular cement remnants of rubber sealing parts, nests, perforator and other foreign particles. It is quite clear that it is necessary to significantly improve the quality of tailing-in of perforations in wells, the insertion of the drilling operation, and after them the repair work.

Molecule bone glue on the chemical composition consists of a protein part, lipids (fats), mineral salts and other compounds. The protein portion of the molecule bone glue is represented by amino acids having acidic (carboxyl) and basic amino groups, which gives the solution of bone glue amphoteric character. For certain values of pH the pH in solutions of bone glue dominated by the dissociation of those or other groups, which gives the molecule bone glue the corresponding charge. The presence of these substances, as well as some organic and inorganic compounds in solution molecules bone glue cause its surface-active properties. Under vigorous stirring bone glue with sodium hydroxide or potassium and water foaming - formed two-phase foam. Abundantly the foaming (high frequency) due to the surface activity which is increased due to the growth of the forces of attraction between hydrophobic parts of various substances in solution of bone glue. Surface-active properties of bone glue also depend on the composition and properties of amino acids incorporated into protein part, on the length and branching of the hydrocarbon chain. Amino acids in a protein molecule bone glue are connected to each other ketoiminate (peptide) bonds (-CO-NH-), forming a long chain main valences - polypeptide chain

where R', R", R"'... - side groups or side chains of the individual amino acid residues.

Peptide bonds are formed by removal of water from the carboxyl group of one amino acid and the amino group of another. In the solution of the macromolecule bone glue can be considered as rolled into a ball of polymer chain composed of links of different polarity. When the foaming of such a macromolecule unfolds and is located on the interface in mezhplanetnoi fluid. The polar ends of the molecules included in the composition of bone glue, facing outwards in the water part of foam film, forming a chemical bond and intermolecular polar ends of the adjacent cell foam bubbles, and non-polar - inside (aerial part). Additionally, the construction of the adsorption layers of bubble p who were involved artisanal soap (a mixture of sodium stearate or potassium and glycerol), which is formed in the presence of sodium hydroxide or potassium, in the saponification of lipid (fat) part of the molecule of bone glue and the surface-active substance that increases the foaming - multiplicity and stability of the resulting foam. The stability of the resulting foam is measured at the rate of leakage of fluid from mezhplanetnogo space - syneresis. Low rate of syneresis is achieved due to the formation of structural shells in the film of bubble foam, with a large variety of polar (hydrophilic) groups, firmly holding the water molecules. The latter leads to lower values of the rate of filtration and to improve the rheological properties (plastic viscosity, SNA), which in turn leads to improved retention.

Of the proposed structure is formed system with a strongly developed surface-active ability - two-phase foam, which has elevated any abscopal properties with respect to the clay component of the collector. The inhibition is due to the following: adsorbed on the surface of clay particles, the molecule of bone glue forms a film of two-dimensional gel. Molecule of bone glue, giving adsorption film with sufficient tensile strength (surface durability) has the production ability is the capacity to prevent the particles from sticking together. Adsorption stabilization solid films enhances the molecule artisanal Soaps. Thanks peptizyme properties of molecules bone glue in the foam prevents coalescence, sedimentation of clay particles in the perforation channels and micro-cracks formation, and therefore, are not violated filtration properties of the reservoir, thereby retained its natural permeability. Ensure regular cleaning of bottom-hole formation zone from the clay plugging is a serious problem and the main cause is often low treatment efficiency heterogeneous and low-permeability reservoirs due care compositions deeper layers of the high-permeability layers. Therefore, inhibition and decollette (clean) preswaging zone is very important for finding structure in close proximity to the perforation channels, and not its penetration through separate channels deep into the reservoir. To ensure effective decolletee bottom-hole formation zone from the remainder of the drilling fluid, commonly used in the primary reservoir opening required translation of the latter in fine condition destruction coagulation contacts and partial destruction of the structure of a clay of mud particles. This is facilitated by the impact of molecules of bone glue on the destruction of the hydrated layers that can obrazovyvat is camping on the clay surface as a result of penetration of the mud filtrate, used for drilling. Molecules, ions or atoms in the crystal lattice of clay interact with the dipoles of water. The activity of this interaction is determined primarily by the nature of free unsaturated surface forces in the crystal lattice of the clay and in accordance with this the most active in this interaction appears to ionic strength, and the least - molecular forces. In this regard, in close proximity to the surface of the formed ordered hydrated layers. The first layer of hydrated membrane on the surface of the clay is formed as a result of adsorption of water, whereas in the subsequent layers involved and the strength of the hydrogen bonds. Foam having on its surface polar (solidarily) group, attached to the surface of the clay particles, thereby reducing the force field around the surface. The hydrophobic parts of the molecules bone glue turned toward the water and screen these force fields. With full coverage of the clay component of the collector foam formed from the proposed structure, the shielding effect is enhanced. The result of this interaction between the dipoles of water and ions in the crystal lattice of the clay decreases the stability of anomalous water layers. This foam has delllatitude properties. Thanks protective properties is received in the process of conducting perforating operations a significant portion of the water from the remnants of mud, which was hoteltravel extracted. In addition, for the same reasons also extracted part of the bound water. Fine not aggregated clay particles are removed from the bottom-hole formation zone of the flow of fluids in the process of development and operation of wells. Improves the hydrodynamic coupling hole and the reservoir.

The use of the above stable foam when conducting perforation weakens the impact of the shock (explosive waves)generated by the ejection hole. Additional damping of the last is provided by the great viscosity of the foam obtained from the proposed structure. Viscoelastic properties of a specified foam intensively reflect the energy of the shock (blast), damping which prevents cracking of the cement sheath and helps to preserve the integrity of the casing. Use as solvent, sodium hydroxide or potassium increases the solubility of bone glue with the formation of new surface-active substances artisanal Soaps and helps dissolve hydrocarbon formations. Sharing solvent and bone glue gives the composition of the surface-active properties, which is the removal of contaminating reagents effectively realized during many years held in the state of RA is personal dispersive particles, clogging bottom-hole formation zone of the wellbore. The choice of components used in the proposed structure, is explained not only by their properties, but also the ability to quickly remove from the well after perforation.

The content in the composition of bone glue in the amount less than 4 wt.%, as sodium hydroxide or potassium in an amount less than 0.2 wt.% does not provide the foam with the desired properties is worsening.

The content in the composition of bone glue more than 6 wt.%, as sodium hydroxide or potassium in an amount of more than 0.5 wt.% impractical because of the significant improvement in the properties does not occur.

Thus, according to the above, to achieve the claimed technical result.

Known complex additive for concrete mixtures (see A.S. USSR №1719377 from 14.02.1990, CL 04 In 38/02, publ. in ABOUT No. 10, 1992, the combined effect of sulfonic acids and bone glue in it gives the effect of vostokovedenie and stabilize the foam. The purpose of this invention is to increase the degree of the closed porosity of the porous concrete and reduce its thermal conductivity.

According to available sources known not identified technical solutions that have the signs consistent with the distinctive features of the present invention according to the claimed technical result.

Declare the structure meets the condition of "inventive step".

In more detail the essence of the invention is described by the following examples.

In field conditions are perforated at well # 26 Pelagiadinsky.

The source data

Production column - 0,146 m

(thickness 8 mm) 1010 m

Tubing - 0,073 m 850 m

Artificial slaughter, L 919 m

The perforation interval, Nperp853-915 m

Pressure PPL1.97 MPa.

Heterogeneous permeability layer of highly permeable silts and low permeability siltstone. Bottomhole formation zone polluted by mud.

1. Produces killing the well technical water conditions create represei on the layer. To do this:

the value of the bottomhole pressure PZabdetermined as follows:

PZab=PPL· 1,15,

where 1,15 - coefficient exceeding the hydrostatic pressure above the reservoir (see safety Rules in oil and gas industry, M., 1998).

PZab=1,97· 1,15=2,27 MPa,

The specified pressure to deliver the liquid column h from the upper perforations:

where ρWis the density of the kill fluid, kg/m3.

Then the liquid column of the killing will be on level N:

N=853-231=622 m

2. The volume of kill fluid is:

where d is the inner diameter of the production string, m;

Therefore, the volume of kill fluid is about 4 m3.

3. The amount of foamable composition Vpicdetermined by the formula

where Nperpthe perforation interval, m;

where 1,20 - coefficient taking into account the zone of mixing of different compositions (see Temporary instructions for the killing of wells with the use of penemunde with filler under conditions of abnormally low, Stavropol, 2001).

Considering the volume of buffer fluid, equal to 0.2 m3, the amount of foamable composition is 1.2 m3.

4. Prepare a foamable composition, wt.%:

Bone glue 6

The potassium hydroxide 0,5

Water 93,5.

In the pump cementing unit type CA-320M volume of 3 m3prepare foamable composition. To prepare the composition in 1122 l of water (to 93.5 wt.%), dissolve 6 kg (0.5 wt.%) potassium hydroxide, then injected 72 kg bone glue (6 wt.%) and leave until it is completely dissolved.

5. The tubing set at the level of the assumed lower perforations (915 m).

6. Tie cementing unit CA-320M with advocay line through the ejector D-14.

7. The village is edutella pumped into the well annulus buffer liquid of the same composition, as for the perforation in the volume V1=0.15 m3no air leaks from the atmosphere, then open the air inlet to the ejector and pump V2=1.0 m3with free of air leaks from the atmosphere. Disconnect the ejector and pump V3=0.05 m3foaming liquid.

8. Raise the tubing.

9. Set persalvic.

10. Down the hammer PC-105 on the cable.

11. Produce perforation of the productive formation in the planned interval (915-853 m).

12. Raise the hammer.

13. Down the tubing to a depth of 5-10 m above the top of the holes.

14. Mount the tree.

15. Make a well completion fluid increase depression on a layer using two-phase foam.

The liquid well before the work was on average 90-110 thousand m3/day, after - 138 thousand m3/day.

Example 1 (laboratory).

To prepare 100 g of a foaming composition in the 95.8 ml of water, which accounts for 95.8 wt.%, dissolve 0.2 g of sodium hydroxide, which is 0.2 wt.%, then add 4 g of bone glue that is 4 wt.% and leave for the complete dissolution for 3 hours, after which the composition is foamed on the mixer “Voronezh”.

Foamable composition has the following properties: foam with 5.3, the stability of the foam - 860,2/cm3Plasticeskaja viscosity of 8.2 MPa· that dynamic is Ascot - 2,9 PA SNA 1 minute to 6.0 PA, after 10 minutes - 12.0 PA, yield - 2.6 cm3for 30 minutes, the maximum swelling properties of the clay sample - 5,63· 10-3cm3/g, coefficient of restitution permeability was 99.4%.

Example 2.

Prepare 100 g of a foaming composition, g/wt.%:

Bone glue 4/4

The potassium hydroxide 0,5/0,5

Water 95,5/95,5.

Conduct all operations as described in example 1.

Foamable composition has the following properties: foam - 5,6, stability foam - 856,0/cm3the plastic viscosity of 8.9 MPa· s, dynamic viscosity of 3.2 PA, SNA after 1 minute - 6,2 PA, after 10 minutes - 12.0 PA, yield - 2.4 cm3for 30 minutes, the maximum swelling properties of the clay sample - 4,71· 10-3cm3/g, coefficient of restitution permeability 99.3 percent.

Example 3. Prepare 100 g of a foaming composition, g/wt.%:

Bone glue 4/4

Sodium hydroxide 0,3/0,3

Water 95,7/95,7.

Conduct all operations as described in example 1.

Foamable composition has the following properties: foam - 5,4, stability foam - 852,0/cm3the plastic viscosity of 8.5 MPa· s, dynamic viscosity of 3.0 PA, SNA 1 minute to 6.0 PA, after 10 minutes - 12.0 PA, yield - 2.3 cm3for 30 minutes, the maximum swelling properties of the clay sample - 5,02· 10-3cm3/g, coefficient of restitution permeable the STI - 99,3%.

Example 4.

Prepare 100 g of a foaming composition, g/wt.%:

Bone glue 5/5

The potassium hydroxide 0,2/0,2

Water 94,8/94,8.

Conduct all operations as described in example 1.

Foamable composition has the following properties: foam - 5,1, stability foam - 710,0/cm3the plastic viscosity of 9.0 MPa· s, dynamic viscosity of 3.3 PA, SNA after 1 minute of 7.0 PA, after 10 minutes - 13,0 PA, yield - 2.2 cm3for 30 minutes, the maximum swelling properties of the clay sample - 4,93· 10-3cm3/g, coefficient of restitution permeability was 99.4%.

Example 5.

Prepare 100 g of a foaming composition, g/wt.%:

Bone glue 5/5

Sodium hydroxide 0,5/0,5

Water 94,5/94,5.

Conduct all operations as described in example 1.

Foamable composition has the following properties: foam - 5,6, stability foam - 688,6/cm3the plastic viscosity of 9.4 MPa· s, dynamic viscosity of 3.5 PA, SNA after 1 minute - 7,2 PA, after 10 minutes - 13,0 PA, yield - 2.1 cm for 30 minutes, the maximum swelling properties of the clay sample - 4,18· 10-3cm3/g, coefficient of restitution permeability of 99.5%.

Example 6.

Prepare 100 g of a foaming composition, g/wt.%:

Bone glue 5/5

The potassium hydroxide 0,3/0,3

Water 94,7/94,7.

Conduct all operations as described in example 1.

Foamable composition of them is et the following properties: foam - 5.5, the stability of the foam - 701,2/cm3the plastic viscosity of 9.2 MPa· s, dynamic viscosity and 3.4 PA, SNA after 1 minute - 7,1 PA, after 10 minutes - 13,0 PA, yield - 2.2 cm3for 30 minutes, the maximum swelling properties of the clay sample - 3,99· 10-3cm3/g, coefficient of restitution permeability of 99.7%.

Example 7.

Prepare 100 g of a foaming composition, g/wt.%:

Bone glue 6/6

Sodium hydroxide 0,2/0,2

Water 93,8/93,8.

Conduct all operations as described in example 1.

Foamable composition has the following properties: foam - 5.0, stability foam - 923,8/cm3the plastic viscosity of 9.5 MPa· s, dynamic viscosity of 3.7 PA SNA 1 minute to 8.0 PA, after 10 minutes of 13.5 PA, yield - 2.0 cm3for 30 minutes, the maximum swelling properties of the clay sample - 3,81· 10-3cm3/g, coefficient of restitution permeability of 99.7%.

Example 8.

Prepare 100 g of a foaming composition, g/wt.%:

Bone glue 6/6

The potassium hydroxide 0,5/0,5

Water 93,5/93,5.

Conduct all operations as described in example 1.

Foamable composition has the following properties: foam - 5,9, stability foam - 884,0/cm3the plastic viscosity of 11.0 MPa· s, dynamic viscosity of 3.9 PA, SNA after 1 minute of 8.5 PA, after 10 minutes - 14,0 PA, yield - 2.2 cm3for 30 minutes, the maximum is the swelling properties of the clay sample - 3,13· 10-3cm3/g, coefficient of restitution coefficient - 99,8%.

Example 9.

Prepare 100 g of a foaming composition, g/wt.%:

Bone glue 6/6

Sodium hydroxide 0,3/0,3

Water 93,7/93,7.

Conduct all operations as described in example 1.

Foamable composition has the following properties: foam - 5,7, stability foam - 907,6/cm3the plastic viscosity of 10.0 MPa· s, dynamic viscosity of 3.8 PA, SNA after 1 minute of 8.2 PA, after 10 minutes - 14,0 PA, yield - 2.0 cm3for 30 minutes, the maximum swelling properties of the clay sample - 3,86· 10-3cm3/g, coefficient of restitution permeability of 99.5%.

Thus, the claimed technical solution meets the condition of “novelty, inventive step and industrial applicability”, that is patentable.

Foamable composition for perforating productive strata containing the foaming agent, inhibiting reagent, solvent, and water, characterized in that it as a foaming agent and inhibiting reagent contains bone glue, and the solvent is sodium hydroxide or potassium in the following ratio, wt. %:

Bone glue 4-6

Sodium hydroxide or potassium 0,2-0,5

Water the rest



 

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EFFECT: improved fluid-carrying ability.

1 tbl

FIELD: oil and gas production industry, in particular two-phase foam forming composition for secondary development of clay grouted stratum with non-uniform permeability by perforation under abnormal law stratum pressure.

SUBSTANCE: claimed composition contains foam forming agent, inhibitor, solvent and water. Bone glue in amount of 4-6 mass % is used as foam forming agent and inhibitor, sodium or potassium hydroxide in amount of 0.2-0.5 % is used as solvent, and balance: water. Composition of present invention makes it possible to produce foam with increased order, stability, inhibiting properties, low filtration factor, improved holding properties and to keep integrity of casing string and cement ring.

EFFECT: increased efficiency of secondary stratum development by perforation.

9 ex

FIELD: oil and gas production industry, in particular two-phase foam forming composition for development of productive stratum under abnormal law stratum pressure.

SUBSTANCE: claimed composition contains foam forming agent, stabilizer, inhibitor, and processing water. Bone glue in amount of 3-5 mass % is used as foam forming agent, stabilizer and inhibitor, and balance: processing water. Composition of present invention makes it possible to produce foam with increased order, stability, inhibiting and geological properties, low filtration factor, improved holding properties.

EFFECT: increased efficiency of stratum development.

3 ex

Well killing method // 2260680

FIELD: gas production equipment, particularly for killing wells with reservoir pressure below hydrostatic pressure and for gas pipeline protection against water and mechanical impurities.

SUBSTANCE: method involves injecting methylcellulose used as gel-forming composition into well, wherein methylcellulose is introduced as foamed aqueous solution and density thereof may be regulated along the whole well borehole height.

EFFECT: possibility to regulate well killing liquid density along well borehole height, increased speed of well killing gel-forming composition production.

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