Method and composition for inhibiting scale in oil-bearing formations

Abstract

The invention relates to the field of organic chemistry, and more particularly to compositions for inhibiting the deposition of scale in an oil-bearing formation and in gas and oilfield equipment and to methods for the use of said compositions. A method for inhibiting scale in oil-bearing formations is characterized in that a water-based composition is introduced into the near-wellbore region of a formation, said composition including (3-aminopropyl)triethoxysilane (APTES), sodium lignosulphonate (LS) and a scale inhibitor, wherein at least one of the following agents is used as the scale inhibitor: hydroxyethylidene diphosphonic acid (HEDP), hydroxyethylidene diphosphonic acid tetrasodium salt or a zinc complex of hydroxyethylidene diphosphonic acid disodium salt (HEDP-Zn). The technical result is an increase in the efficiency of scale inhibition as a result of the prolonged release of the inhibitor.

Description

[0001] METHOD AND COMPOSITION FOR INHIBITING THE FORMATION OF SCALE DEPOSITS IN OIL-BEARING FORMATIONS

[0002] Field of technology.

[0003] The invention relates to the field of organic chemistry, namely to compositions for inhibiting salt deposits in an oil reservoir and gas and oil field equipment and methods for using them.

[0004] State of the art.

[0005] A method is known for modifying a formation with the aim of reducing process stops in squeeze technology, increasing the inhibitor release time (WO2009144566A1 [1], publication date 03.12.2009).

[0006] A method for treating a geological formation includes introducing a treatment fluid into the geological formation, wherein the treatment fluid comprises a base fluid, a scale inhibition activator, and a scale inhibitor, and closing the geological formation for a period of time sufficient to initiate deposition of the scale inhibitor on the surface of the geological formation. The scale inhibition activator comprises 3-aminopropyltriethoxysilane.

[0007] The method involves the use of organosilanes, in particular 3-aminopropyltriethoxysilane, as rock modifiers.

[0008] The disadvantage is the lack of the ability to form voluminous gels distributed throughout the entire pore space of the rock, which reduces the potential capacity of the modifier composition in relation to the inhibitor.

[0009] A composition for preventing inorganic salt deposits is known, which contains the following ratio of components, in wt.%: from 0.1 to 0.125 polyaminomethylphosphonic acid, from 0.375 to 0.9 sodium salt of polyacrylic acid, the rest is water or an aqueous solution of ethylene glycol (RU2230766C1 [2], publication date 06 / 20 / 2004).

[0010] The disadvantage of the composition is the lack of chemical bonds between the inhibitors and the rock and, as a consequence, the impossibility of achieving their prolonged release.

[0011] A method is known for preventing the deposition of inorganic salts in oil and gas production equipment, designed to increase the life of scale inhibitors due to the preliminary stage of injecting a solvent into the formation before its subsequent modification to ensure the availability of paraffin-coated microcavities of the formation for

[0012] 1

[0013] SUBSTITUTE SHEET (RULE 26) for inhibitor sorption. It is proposed to use mixtures of NTP, OEDF, and hydrochloric and hydrofluoric acids as scale inhibitors, which, when interacting with the rock, increase the sorption area (patent RU2320852C2 [3], publication date 27.03.2008).

[0014] A disadvantage of this method is the lack of chemical bonding between the inhibitors and the rock, making it impossible to achieve prolonged release. Furthermore, the presence of acidic reagents in the composition can increase corrosion of downhole equipment. The presence of hydrofluoric acid in the composition can lead to the formation of poorly soluble calcium fluoride if the composition comes into contact with formation waters and formation rocks containing calcium ions.

[0015] Layered double hydroxide materials are known as additives for increasing the life of chemical treatment against deposits, containing a layered double metal hydroxide, including a deposit inhibitor intercalated between its positively charged layers. (W02020120976A1 [4], publication date 18.06.2020).

[0016] The disadvantage of this method is a slight increase in the inhibitor concentration (below 10 mg / l) during well operation.

[0017] An inhibitor of iron sulfide formation suitable for use in squeeze technology is known (WO2021174096A1 [5], publication date 09 / 02 / 2021)

[0018] The composition comprises 80-82 mol% of a first monomer unit, wherein the first monomer unit is 2-acrylamido-2-methylpropanesulfonic acid. The composition also comprises from 2 to 18 mol% of a second monomer unit selected from N-vinylformamide, N-vinylpyrrolidone, and diallyldimethylammonium chloride.

[0019] The disadvantage of the composition is the need to synthesize copolymers, which significantly complicates and increases the cost of this technology.

[0020] A method and composition for removing inorganic deposits is known from the prior art according to international application WO2014004697 A2 [6] (publication date 03.01.2014) "Method for removing inorganic deposits", this composition may include 3-aminopropyltriethoxysilane and a scale inhibitor. A disadvantage of this composition is its low adhesive capacity with respect to rocks.

[0021] 2

[0022] SUBSTITUTE SHEET (RULE 26) The method and composition according to application WO2014004697 A2 [6] are the closest analogues of the claimed technical solution.

[0023] The essence of the invention.

[0024] The technical problem that the claimed invention is aimed at solving is the creation of new compositions based on polymer gels with adhesive properties to the surface of the rock of an oil-bearing formation and a proppant placed in the formation during hydraulic fracturing, capable of providing long-term inhibition of salt deposits in the zone of oil deposits under conditions of high mineralization of formation waters.

[0025] The technical result achieved by implementing the invention consists of increasing the effectiveness of scale inhibition by increasing the release time of the scale inhibitor from the formation rock / proppant surface. The active substance used for scale inhibition is oxyethylidenediphosphonic acid (OEDPA), the tetrasodium salt of OEDPA, or the zinc complex of the disodium salt of OEDPA (OEDPA-Zn).

[0026] The claimed technical result is achieved by introducing into the bottomhole formation zone a composition for inhibiting the formation of scale deposits in an oil-bearing formation based on water, including 3-aminopropyltriethoxysilane (APTES) and a scale formation inhibitor, wherein said composition additionally contains sodium lignosulfonate (LS), and at least one substance selected from the group of oxyethylidenediphosphonic acid (OEDPA), tetrasodium salt of oxyethylidenediphosphonic acid, zinc complex of disodium salt of oxyethylidenediphosphonic acid (OEDPA-Zn) is used as the scale formation inhibitor at the following values ​​of component content, wt.%:

[0027] 3-aminopropyltriethoxysilane 1-10; sodium lignosulfonate 0.1-5; the specified salt formation inhibitor 0.1-5; water up to 98.8.

[0028] In addition, in a particular case of implementing the invention, cationic surfactants are additionally introduced into the composition in an amount of up to 3.0 wt.% of the composition, which ensures the washing of the oil film from the surface of the rock and a higher degree of adhesion of the composition to the formation rock.

[0029] 3

[0030] SUBSTITUTE SHEET (RULE 26) In addition, in a particular case of the invention’s implementation, mutual solvents are additionally introduced into the composition up to 20.0 wt.% of the composition, which ensures the washing of the oil film from the surface of the rock and a higher degree of adhesion of the composition to the formation rock.

[0031] In addition, in a particular case of implementing the invention, a corrosion inhibitor is additionally introduced into the composition at a level of up to 5.0 wt.% of the composition, which ensures protection of deep-well pumping equipment from the corrosive effects of the acidic components of the composition.

[0032] In addition, in a particular case of the invention implementation, before introducing the composition into the bottomhole formation zone, the bottomhole formation zone is treated with aqueous solutions of acids and alkalis, which ensures the removal of salt deposits from the surface of the rock and a higher degree of adhesion of the composition to the formation rock.

[0033] In addition, in a particular case of the invention implementation, before introducing the composition into the bottomhole formation zone, the bottomhole formation zone is treated with an aqueous solution of a mutual solvent, which ensures the washing of the oil film from the surface of the rock and a higher degree of adhesion of the composition to the formation rock.

[0034] In addition, in a particular case of the invention implementation, before introducing the composition into the bottomhole formation zone, the bottomhole formation zone is treated with an aqueous solution of a cationic surfactant, which ensures the washing of the oil film from the surface of the rock and a higher degree of adhesion of the composition to the formation rock.

[0035] In addition, in a particular case of the invention implementation, the introduction of the composition into the bottomhole zone of the formation is carried out through the annular space of the well between the production string and the tubing, which ensures a reduction in the duration of the operation at the well due to the absence of the need to remove the tubing.

[0036] Also, the technical result is achieved due to the fact that the composition for inhibiting the formation of scale deposits in an oil-bearing formation contains water, 3-aminopropyltriethoxysilane (APTES), sodium lignosulfonate (LS) and a scale formation inhibitor, wherein at least one of the following substances acts as a scale formation inhibitor: oxyethylidenediphosphonic acid (OEDPA), tetrasodium salt of oxyethylidenediphosphonic acid or zinc complex of disodium

[0037] 4

[0038] SUBSTITUTE SHEET (RULE 26) salts of oxyethylidenediphosphonic acid (OEDPA-Zn), with the following ratio of components, wt.%:

[0039] 3-aminopropyltriethoxysilane 1-10; sodium lignosulfonate 0.1-5; salt formation inhibitor 0.1-5; water up to 98.9.

[0040] In addition, in a particular case of the invention implementation, the composition additionally includes cationic surfactants in an amount of up to 3.0 wt.%, which ensures the washing of the oil film from the surface of the rock and a higher degree of adhesion of the composition to the formation rock.

[0041] In addition, in a particular case of the invention implementation, the composition additionally includes mutual solvents up to 20.0 wt.%, which ensures the washing of the oil film from the surface of the rock and a higher degree of adhesion of the composition to the formation rock.

[0042] In addition, in a particular case of the invention, the composition additionally includes a corrosion inhibitor of up to 5.0 wt.%, which ensures protection of deep-well pumping equipment from the corrosive effects of the acidic components of the composition.

[0043] When 3-aminopropyltriethoxysilane (APTES) and oxyethylidenediphosphonic acid (OEDPA) interact, the gelation reaction of aminoorganosilanol gels is triggered by the destruction of quasi-stable cycles of 3-aminopropyltriethoxysilane (APTES) in water.

[0044] The resulting gel is capable of interacting with the hydroxyl surfaces of mineral rocks and is retained within the rock due to its high viscosity. Due to the presence of a large number of positively charged amino groups in the gel, negatively charged groups of the scale inhibitor, oxyethylidenediphosphonic acid (OEDPA), which is involved in the formation of this gel, are sorbed. Thus, the gels are initially saturated with the scale inhibitor, and upon introduction into the rock, its slow release occurs due to the fact that its ionic binding to the gel is not strong. Therefore, treating rocks with the proposed organosilane-based composition can prevent a decrease in the hydraulic permeability of the rock by inhibiting scale formation on the rock surface. A possible mechanism for this effect is associated with a decrease in the number of crystal formation centers on the sand surface, which leads to

[0045] 5

[0046] SUBSTITUTE SHEET (RULE 26) formation of small crystals in a volume that is not capable of significantly clogging the rock.

[0047] Sodium lignosulfonate (LS) forms soluble salts with calcium ions, and APTES-LS polyelectrolyte complexes form stable gels in brines with high calcium concentrations (80 g / L NaCl and 200 g / L CaCh). The rate of APTES-LS gel formation depends on the pH of the medium and the ratio of the components, allowing for fine-tuning. APTES-lignosulfonate complexes exhibit high adhesive properties to rocks.

[0048] The combined use of 3-aminopropyltriethoxysilane (APTES), oxyethylidenediphosphonic acid (OEDPA) and sodium lignosulfonate (LS) provides a synergistic effect in the form of prolonged release of a scale inhibitor with a controlled rate of gelation and high adhesive capacity in relation to the surface of the formation rock / proppant.

[0049] The use of tetrasodium hydroxyethylidenediphosphonic acid or zinc complex of disodium hydroxyethylidenediphosphonic acid (OEDPA-Zn) as an alternative to hydroxyethylidenediphosphonic acid (OEDPA) also provides inhibition of corrosion processes and scale deposits.

[0050] Brief description of the drawings.

[0051] Fig. 1 - Dependence of the inhibitor concentration at the column outlet on the passed volumes of brine for the composition according to Example 2.

[0052] The implementation of the invention is confirmed by the examples given below, but is not limited to them.

[0053] Example #1

[0054] The composition was obtained by mixing water, aminopropyltriethoxysilane (APTES), oxyethylidenediphosphonic acid (OEDPA) and sodium lignosulfonate (LS) in the following ratio (wt.%).

[0055] Aminopropyltriethoxysilane (APTES) - 10;

[0056] Oxyethylidene diphosphonic acid (OEDPA) - 5;

[0057] Sodium lignosulfonate (LS) - 5;

[0058] Water - 80.

[0059] The composition's adhesion to a model substrate (quartz sand) was tested. A column with a total volume of 100 ml (pore volume of 43 ml) was prepared for this experiment.

[0060] 6

[0061] SUBSTITUTE SHEET (RULE 26) Natural quartz sand with a fraction of 0.4-1 mm was used for the rocks. The column was filled with brine and then sand was added.

[0062] After settling and sedimentation of the sand, the column was washed with 100 ml of brine to remove suspended colloidal particles.

[0063] The resulting composition was introduced into the column at a rate of 10 ml / min in a volume of 20 ml. After the complex solution had completely entered the column, 10 ml of brine was added to shift the gel formation region to the center of the column, and the flow was stopped for 24 hours, allowing the complexes to gel.

[0064] The column was opened and brine flow continued at a rate of 2 ml / min. Fractions of 10 ml were collected at the column outlet, and their OEDFA content was determined. On the control column, pure OEDFA was eluted after passing 1.25 times the column pore volume (50 ml), with virtually no retention: after the first 50 ml, its concentration dropped to zero. However, when OEDFA was added as part of complexes with APTS-LS, the retention time on the column increased.

[0065] Maximum release of the composition from the column occurs upon reaching 0.5 pore volumes. However, OEDPA is fully released only after passing 2.75 column pore volumes. Furthermore, the composition released the inhibitor (OEDPA) in a sustained manner at levels of 2430–69523 mg / L, which is sufficient to effectively inhibit scaling. These results demonstrate the ability of OEDPA-LS-APTS complexes to release OEDPA in a sustained manner.

[0066] Example #2

[0067] The composition was obtained by mixing water, aminopropyltriethoxysilane (APTES), oxyethylidenediphosphonic acid (OEDPA) and sodium lignosulfonate (LS) in the following ratio (wt.%).

[0068] Aminopropyltriethoxysilane (APTES) - 5;

[0069] Oxyethylidene diphosphonic acid (OEDPA) - 2;

[0070] Sodium lignosulfonate (LS) - 2;

[0071] Water - 91.

[0072] The composition was tested on a model substrate (quartz sand) in a similar manner to the procedure described in Example 1.

[0073] Fig. 1 shows a graph of the release of OEDFA from the column.

[0074] As can be seen from the presented data, on the control column, pure OEDFK is washed out already after passing 1.25 pore volumes 7

[0075] SUBSTITUTE SHEET (RULE 26) column (50 ml), with virtually no retention: after the first 50 ml, its concentration drops to zero. At the same time, when OEDFK is added as part of complexes with APTS-LS, the retention time on the column increases, as evidenced by a longer elution period.

[0076] While passing the brine, the content of oxyethylidene diphosphonic acid was determined at the outlet of the column.

[0077] The composition released the inhibitor in a prolonged manner in the amount of 1030

[0078] - 38900 g / l, which is sufficient for effective inhibition of salt formation.

[0079] Example #3

[0080] The composition was obtained by mixing water, aminopropyltriethoxysilane (APTES), oxyethylidenediphosphonic acid (OEDPA) and sodium lignosulfonate (LS) in the following ratio (wt.%).

[0081] Aminopropyltriethoxysilane (APTES) - 1;

[0082] Oxyethylidene diphosphonic acid (OEDPA) - 0.1;

[0083] Sodium lignosulfonate (LS) - 0.1;

[0084] Water - 98.8.

[0085] The composition was tested on a model substrate (quartz sand) in a similar manner to the procedure described in Example 1.

[0086] While passing the brine, the content of oxyethylidene diphosphonic acid was determined at the outlet of the column.

[0087] The composition released the inhibitor in a prolonged manner in an amount of 45-510 mg / l, which is sufficient for effective inhibition of salt formation.

[0088] Example #4

[0089] The composition was prepared in a manner similar to Example 1, with the difference that instead of oxyethylidenediphosphonic acid (OEDPA), tetrasodium salt of oxyethylidenediphosphonic acid was used.

[0090] During the passage of brine, the content of the salt formation inhibitor was determined at the outlet of the column.

[0091] The composition released the inhibitor in a prolonged manner in the amount of 2256

[0092] - 72852 mg / l, which is sufficient for effective inhibition of salt formation.

[0093] Example #5

[0094] The composition was prepared in a manner similar to Example 2, with the difference that instead of oxyethylidenediphosphonic acid (OEDPA), tetrasodium salt of oxyethylidenediphosphonic acid was used.

[0095] 8

[0096] SUBSTITUTE SHEET (RULE 26) During the passage of brine, the content of the salt formation inhibitor was determined at the outlet of the column.

[0097] The composition released the inhibitor in a prolonged manner in an amount of 1120-39631 g / l, which is sufficient for effective inhibition of salt formation.

[0098] Example #6

[0099] The composition was prepared in a manner similar to Example 3, with the difference that instead of oxyethylidenediphosphonic acid (OEDPA), tetrasodium salt of oxyethylidenediphosphonic acid was used.

[0100] During the passage of brine, the content of the salt formation inhibitor was determined at the outlet of the column.

[0101] The composition released the inhibitor in a prolonged manner in an amount of 47–488 mg / l, which is sufficient for effective inhibition of salt formation.

[0102] Example #7

[0103] The composition was prepared in a manner similar to Example 1, with the difference that instead of oxyethylidenediphosphonic acid (OEDPA), a zinc complex of the disodium salt of oxyethylidenediphosphonic acid (OEDPA-Zn) was used.

[0104] During the passage of brine, the content of the salt formation inhibitor was determined at the outlet of the column.

[0105] The composition released the inhibitor in a prolonged manner in an amount of 2685-71630 mg / l, which is sufficient for effective inhibition of salt formation.

[0106] Example #8

[0107] The composition was prepared in a manner similar to Example 2, with the difference that instead of oxyethylidenediphosphonic acid (OEDPA), a zinc complex of the disodium salt of oxyethylidenediphosphonic acid (OEDPA-Zn) was used.

[0108] During the passage of brine, the content of the salt formation inhibitor was determined at the outlet of the column.

[0109] The composition released the inhibitor in a prolonged manner in an amount of 1115 - 38639 mg / l, which is sufficient for effective inhibition of salt formation.

[0110] Example #9

[0111] The composition was obtained in a manner similar to Example 3 with the difference that instead of oxyethylidenediphosphonic acid (OEDPA)

[0112] 9

[0113] SUBSTITUTE SHEET (RULE 26) used zinc complex of disodium salt of oxyethylidenediphosphonic acid (OEDPA-Zn).

[0114] During the passage of brine, the content of the salt formation inhibitor was determined at the outlet of the column.

[0115] The composition released the inhibitor in a prolonged manner in an amount of 73–625 mg / l, which is sufficient for effective inhibition of salt formation.

[0116] Example #10

[0117] The composition was prepared in a manner similar to Example 1, with the difference that the composition included cationic surfactants in an amount of 3.0 wt.% of the composition.

[0118] The composition released inhibitor in a sustained manner at a rate of 2967-70265 mg / L, which is sufficient for effective inhibition of scaling. The prolonged inhibitor release was demonstrated due to the presence of cationic surfactants in the composition, which provided improved adhesion.

[0119] Example #11

[0120] The composition was prepared in a manner similar to Example 1, with the difference that the composition included mutual solvents in an amount of 20.0 wt.% of the composition.

[0121] The composition released inhibitor in a sustained manner at a rate of 3479-73241 mg / L, which is sufficient for effective scaling inhibition. Prolonged inhibitor removal was demonstrated due to the presence of mutual solvents in the composition, which ensured improved adhesion. Furthermore, the presence of solvents can facilitate the removal of oil film from the rock surface.

[0122] Example #12

[0123] The composition was prepared in a manner similar to Example 1, with the difference that the composition included a corrosion inhibitor in an amount of 5.0 wt.% of the composition.

[0124] The composition released inhibitor in a sustained manner at a rate of 2699-71744 mg / L, which is sufficient to effectively inhibit scaling. The presence of the corrosion inhibitor protects downhole pumping equipment from the corrosive effects of the composition's acidic components.

[0125] 10

[0126] SUBSTITUTE SHEET (RULE 26) Example No. 13

[0127] The composition obtained in Example 1 was introduced into the bottomhole formation zone.

[0128] A prolonged prevention of scaling in the near-wellbore zone was revealed, which indicates a prolonged release of the scaling inhibitor.

[0129] Example #14

[0130] The bottomhole zone was treated with aqueous solutions of hydrochloric acid and sodium hydroxide.

[0131] The composition obtained in Example 1 was introduced into the bottomhole formation zone.

[0132] A prolonged prevention of scaling in the near-wellbore zone was revealed, which indicates a prolonged release of the scaling inhibitor.

[0133] Example #15

[0134] The bottomhole zone was treated with an aqueous solution of hydrochloric acid.

[0135] The composition obtained in Example 1 was introduced into the bottomhole formation zone.

[0136] A prolonged prevention of scaling in the near-wellbore zone was revealed, which indicates a prolonged release of the scaling inhibitor.

[0137] Example #16

[0138] The bottomhole zone was treated with an aqueous solution of a mutual solvent.

[0139] The composition obtained in Example 1 was introduced into the bottomhole formation zone.

[0140] A prolonged prevention of scaling in the near-wellbore zone was revealed, which indicates a prolonged release of the scaling inhibitor.

[0141] Example #17

[0142] The bottomhole zone was treated with an aqueous solution of a cationic surfactant.

[0143] The composition obtained in Example 1 was introduced into the bottomhole formation zone.

[0144] A prolonged prevention of scaling in the near-wellbore zone was revealed, which indicates a prolonged release of the scaling inhibitor.

[0145] AND

[0146] SUBSTITUTE SHEET (RULE 26) Example No. 18

[0147] The bottomhole zone was treated with an aqueous solution of a cationic surfactant.

[0148] The composition obtained in Example 1 was introduced into the bottomhole formation zone through the annular space of the well between the production string and the tubing.

[0149] A prolonged prevention of scaling in the near-wellbore zone was revealed, which indicates a prolonged release of the scaling inhibitor.

[0150] Example #19

[0151] The composition obtained in Example 4 was introduced into the bottomhole formation zone.

[0152] A prolonged prevention of scaling in the near-wellbore zone was revealed, which indicates a prolonged release of the scaling inhibitor.

[0153] Example #20

[0154] The bottomhole zone was treated with aqueous solutions of hydrochloric acid and sodium hydroxide.

[0155] The composition obtained in Example 4 was introduced into the bottomhole formation zone.

[0156] A prolonged prevention of scaling in the near-wellbore zone was revealed, which indicates a prolonged release of the scaling inhibitor.

[0157] Example #21

[0158] The bottomhole zone was treated with an aqueous solution of hydrochloric acid.

[0159] The composition obtained in Example 4 was introduced into the bottomhole formation zone.

[0160] A prolonged prevention of scaling in the near-wellbore zone was revealed, which indicates a prolonged release of the scaling inhibitor.

[0161] Example #22

[0162] The bottomhole zone was treated with an aqueous solution of a mutual solvent.

[0163] The composition obtained in Example 4 was introduced into the bottomhole formation zone.

[0164] A prolonged prevention of scaling in the near-wellbore zone was revealed, which indicates a prolonged release of the scaling inhibitor.

[0165] 12

[0166] SUBSTITUTE SHEET (RULE 26) Example No. 23

[0167] The bottomhole zone was treated with an aqueous solution of a cationic surfactant.

[0168] The composition obtained in Example 4 was introduced into the bottomhole formation zone.

[0169] A prolonged prevention of scaling in the near-wellbore zone was revealed, which indicates a prolonged release of the scaling inhibitor.

[0170] Example #24

[0171] The bottomhole zone was treated with an aqueous solution of a cationic surfactant.

[0172] The composition obtained in Example 4 was introduced into the bottomhole formation zone through the annular space of the well between the production string and the tubing.

[0173] A prolonged prevention of scaling in the near-wellbore zone was revealed, which indicates a prolonged release of the scaling inhibitor.

[0174] Example #25

[0175] The composition obtained in Example 7 was introduced into the bottomhole formation zone.

[0176] A prolonged prevention of scaling in the near-wellbore zone was revealed, which indicates a prolonged release of the scaling inhibitor.

[0177] Example #26

[0178] The bottomhole zone was treated with aqueous solutions of hydrochloric acid and sodium hydroxide.

[0179] The composition obtained in Example 7 was introduced into the bottomhole formation zone.

[0180] A prolonged prevention of scaling in the near-wellbore zone was revealed, which indicates a prolonged release of the scaling inhibitor.

[0181] Example #27

[0182] The bottomhole zone was treated with an aqueous solution of hydrochloric acid.

[0183] The composition obtained in Example 7 was introduced into the bottomhole formation zone.

[0184] A prolonged prevention of scaling in the near-wellbore zone was revealed, which indicates a prolonged release of the scaling inhibitor.

[0185] 13

[0186] SUBSTITUTE SHEET (RULE 26) Example No. 28

[0187] The bottomhole zone was treated with an aqueous solution of a mutual solvent.

[0188] The composition obtained in Example 7 was introduced into the bottomhole formation zone.

[0189] A prolonged prevention of scaling in the near-wellbore zone was revealed, which indicates a prolonged release of the scaling inhibitor.

[0190] Example #29

[0191] The bottomhole zone was treated with an aqueous solution of a cationic surfactant.

[0192] The composition obtained in Example 7 was introduced into the bottomhole formation zone.

[0193] A prolonged prevention of scaling in the near-wellbore zone was revealed, which indicates a prolonged release of the scaling inhibitor.

[0194] Example #30

[0195] The bottomhole zone was treated with an aqueous solution of a cationic surfactant.

[0196] The composition obtained in Example 7 was introduced into the bottomhole formation zone through the annular space of the well between the production string and the tubing.

[0197] A prolonged prevention of scaling in the near-wellbore zone was revealed, which indicates a prolonged release of the scaling inhibitor.

[0198] Sources of information used.

[0199] 1. Application WO2009144566A1. IPC C09K8 / 528. Treatment fluid and methods for improving the efficiency of scale displacement operations / Hans Christian Rohde, Kari Ramstad, Niall Fleming. Application 27.05.2009, published 03.12.2009.

[0200] 2. Patent RU2230766C1. IPC C09K 3 / 00, E21B 37 / 06. Composition for preventing inorganic scale deposits / Perekupka A.G., Elizarova Yu.S., Tarasov M.Yu. Applied 27.11.2002, published 20.06.2004.

[0201] 3. Patent RU2320852C2. IPC E21B 37 / 06. Method for preventing scaling in oil and gas production equipment / Zhivaeva V.V., Vorobyov S.V., Ivontyev K.N., Kabo V.Ya., Komzalov A.G. Applied 10.10.2005, published 20.04.2007.

[0202] 14

[0203] SUBSTITUTE SHEET (RULE 26) 4. Application W02020120976A1. IPC C09K8 / 528. Double hydroxide layered materials as additives for increasing the service life of chemical compression treatments for scale / Saul Moorhouse, Ian R. Collins, Jonathan Crouch. Applied 12.12.2019, published 18.06.2020.

[0204] 5. Application WO2021174096A1. IPC C09K8 / 528. Iron sulfide inhibitor suitable for use under pressure / Lena Petrozziello, Christoph Wolfgang Kaiser, Kirill Okocha, Tao Chen, Ziwei Wang, Nora Aljeaban. Application 02 / 26 / 2021, published 09 / 02 / 2021.

[0205] 6. Application W02014004697A2. IPC C09K8 / 528. Method for removing inorganic deposits / Qi Qu, Ahmed M. Gomaa. Appl. 26.06.2012, published 03.01.2014.

[0206] SUBSTITUTE SHEET (RULE 26)

Claims

CLAUSES OF THE INVENTION 1. A method for inhibiting the formation of scale in an oil-bearing formation, comprising introducing into the bottomhole formation zone a composition for inhibiting the formation of scale in an oil-bearing formation based on water, comprising 3-aminopropyltriethoxysilane (APTES) and a scale formation inhibitor, characterized in that said composition additionally contains sodium lignosulfonate (LS), wherein at least one substance selected from the group of: oxyethylidenediphosphonic acid (OEDPA), tetrasodium salt of oxyethylidenediphosphonic acid, zinc complex of disodium salt of oxyethylidenediphosphonic acid (OEDPA-Zn) is used as the scale formation inhibitor, with the following values ​​of component content, wt.%: 3-aminopropyltriethoxysilane 1-10; sodium lignosulfonate 0.1-5; the specified salt formation inhibitor 0.1-5; water up to 98.

8.

2. The method according to claim 1, characterized in that cationic surfactants are additionally introduced into the composition in an amount of up to 3.0% by weight of the composition.

3. The method according to any one of paragraphs 1-2, characterized in that mutual solvents are additionally introduced into the composition up to 20.0 wt.% of the composition.

4. The method according to any one of paragraphs 1-3, characterized in that a corrosion inhibitor is additionally introduced into the composition up to 5.0 wt.% of the composition.

5. The method according to any one of paragraphs 1-4, characterized in that before introducing the composition into the bottomhole formation zone, the bottomhole formation zone is treated with aqueous solutions of acids and alkalis.

6. The method according to any one of paragraphs 1-5, characterized in that before introducing the composition into the bottomhole formation zone, the bottomhole formation zone is treated with an aqueous solution of a mutual solvent.

7. The method according to any one of paragraphs 1-5, characterized in that before introducing the composition into the bottomhole formation zone, the bottomhole formation zone is treated with an aqueous solution of a cationic surfactant. 16 SUBSTITUTE SHEET (RULE 26) 8. The method according to any one of paragraphs 1-7, characterized in that the introduction of the composition into the bottomhole zone of the formation is carried out through the annular space of the well between the production string and the tubing.

9. A water-based composition for inhibiting the formation of scale deposits in an oil-bearing formation, comprising 3-aminopropyltriethoxysilane (APTES) and a scale formation inhibitor, characterized in that it includes, as a scale formation inhibitor, at least one substance selected from the group: oxyethylidenediphosphonic acid (OEDPA), tetrasodium salt of oxyethylidenediphosphonic acid, zinc complex of disodium salt of oxyethylidenediphosphonic acid (OEDPA-Zn), and additionally sodium lignosulfonate (LS) in the following ratio of components, wt.%: 3-aminopropyltriethoxysilane - 1-10; sodium lignosulfonate - 0.1-5; the specified salt formation inhibitor - 0.1-5; water - up to 98.

8.

10. The composition according to claim 10, characterized in that it additionally includes cationic surfactants in an amount of up to 3.0 wt.%. I. A composition according to any one of paragraphs 10-11, characterized in that it additionally includes mutual solvents up to 20.0 wt.%.

12. A composition according to any one of paragraphs 10-12, characterized in that it additionally includes a corrosion inhibitor of up to 5.0 wt.%. 17 SUBSTITUTE SHEET (RULE 26)

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