Classifications

• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
  • C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
  • C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
  • C09K8/504—Compositions based on water or polar solvents
  • C09K8/506—Compositions based on water or polar solvents containing organic compounds
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
  • C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
  • C09K8/60—Compositions for stimulating production by acting on the underground formation
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
  • C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
  • C09K8/60—Compositions for stimulating production by acting on the underground formation
  • C09K8/62—Compositions for forming crevices or fractures
  • C09K8/72—Eroding chemicals, e.g. acids
  • C09K8/74—Eroding chemicals, e.g. acids combined with additives added for specific purposes
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
  • C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
  • C09K8/60—Compositions for stimulating production by acting on the underground formation
  • C09K8/62—Compositions for forming crevices or fractures
  • C09K8/72—Eroding chemicals, e.g. acids
  • C09K8/74—Eroding chemicals, e.g. acids combined with additives added for specific purposes
  • C09K8/76—Eroding chemicals, e.g. acids combined with additives added for specific purposes for preventing or reducing fluid loss
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
  • C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
  • C09K8/60—Compositions for stimulating production by acting on the underground formation
  • C09K8/84—Compositions based on water or polar solvents
  • C09K8/86—Compositions based on water or polar solvents containing organic compounds

Definitions

• the present invention relates to the use of free aromatic acids with special features for influencing rock formations in the extraction of crude oil or natural gas.
• US Pat. No. 4,617,132 describes a method for influencing the permeability of hydrocarbon of leading underground formations.
• an aqueous mixture is introduced into the subterranean formation which contains inter alia a water-soluble anionic polymer having a molecular weight> 100,000.
• this anionic polymer is contacted with a water-soluble cationic polymer for stabilization purposes.
• multivalent metal cations and a retarding anion such as, for example, acetates, nitrilotriacetates, tetracitrates and phosphates play a role.
• the gel-forming composition comprises a polymer, such as carboxylate-containing polymers, and as a crosslinking component a multivalent metal, such as zirconium and also a pH lowering agent, such as carbon dioxide.
• a polymer such as carboxylate-containing polymers
• a multivalent metal such as zirconium
• a pH lowering agent such as carbon dioxide
• the said international patent application also describes water-soluble, crosslinkable polymer compositions and their use in subterranean rock formations:
• the crosslinkable water-soluble polymer compositions described here contain a polymeric compound which has at least 2 amidocarbonyl groups in the molecule and a compound which is at least 2-formylamido in the molecule Groups.
• the amidocarbonyl groups and formylamido groups react in the presence of acid to form bridge members, which in turn cause crosslinking.
• the abovementioned polymer compositions are used in what is known as "fracture acidification", which is a pressure-acidification process.
• fracture acidification is a pressure-acidification process.
• carbonate formations such as, for example, limestone, dolomite or other storage rocks with limestone-like materials.
• acidification is carried out by injecting aqueous acids into the well at a specific rate and pressure such that the existing formation pressure in the rock is exceeded, yielding the rock and thus additional fractures into the formation be blown up.
• the surfaces of the rock fractures are etched by the acids.
• Acidizing creates channels that have increased permeability to the fossil oil or gas, allowing them to flow more heavily to the wellbore.
• Thickening or gelling agents are often added to the acids used in order to achieve larger fracture volumes and larger clear widths of the fracture.
• the etching rate can be controlled at the surfaces of the formations, wherein the viscous acids have a better transport behavior compared to other additives, such as, for example, proppant.
• so-called “acid diverters” are also used. These are intended to prevent the penetration of stronger acids for stimulation purposes in permeable rock formations.
• WO 03/093641 A1 discloses an acid-thickening system.
• This system is aqueous, thickened acid compositions which, in addition to the acid component, also comprise a gelling agent to which, for example, glycol as a solvent and at least one amidoamine oxide are added, so that a viscoelastic fluid is obtained.
• the acid can also be added to acid-insoluble and flaky substances which are able to seal larger or coarsely porous rock formations.
• Such an example is US Pat. No. 3,998,272.
• discrete solid particles of polyvinyl acetate are used as "diverting agents" in the pressurized acid treatment of subterranean geological formations. Due to their size, the scale-shaped ones penetrate Solid particles exclusively in porous rock formations and close them. The narrower pores remain open, so that these narrower channels can be expanded by acid-induced rock hydrolysis, as occurs in typical Druckklareclar.
• the free aromatic acids are preferably at least one representative of the series 2-naphthoic acid, phthalic acid, isophthalic acid or terephthalic acid.
• the claimed use of specific temperature and pressure conditions is independent; However, it has been found in connection with the influence of the acid influx in rock formations in acidizing treatments to be advantageous if the temperature range> 60 0 is C, said temperatures> 80 0 C, in particular> 130 0 C and more preferably> 150 0 C amount.
• the acids can be dissolved after the acid treatment, which is preferably achieved by the addition of organic amines and in particular of at least one representative of the ethylene amines, such as.
• Triethylamine, triethylenetetramine, triethylenepentamine, polyethyleneimine, or ethanola- mine, such as triethanolamine takes place.
• the dissolution of the acids but also by the fossil material, such as, for example, the crude oil itself, take place, in particular, the nitrogen-containing components contained in the crude play an essential role.
• the present invention also encompasses the use of the free aromatic acids to reduce the rock permeability and, in particular, to reduce the inflow of water.
• salts of aromatic acids in question wherein at least one member of the series alkali metal salts, inorganic or organic ammonium salts come into question and in particular compounds whose ammonium ions are components of organic ammonium compounds such. Diethylenetriamine, triethyltetramine or tetraethylenepentamine.
• the present invention also encompasses a method for influencing and, in particular, controlling the acid inflow into rock formations in the exploitation of underground oil and / or natural gas deposits in so-called acidizing treatments.
• At least one representative of the series 2-naphthoic acid, phthalic acid, isophthalic acid or terephthalic acid, more preferably below, is at least one member of the free, aromatic acids containing at least two aromatic ring systems or at least two acid functionalities, and in particular at least one member of the series 2-naphthoic acid
• Additional viscosity-increasing additives such as, for example, polymers or viscoelastic surfactants, pumped into the rock formation to be treated.
• Suitable viscoelastic surfactants with ionic character are alkyl carboxylates, alkyl ether carboxylates, alkyl sulfates, alkyl ether sulfates, alkyl sulfonates, alkyl ether sulfates, alkyl phosphates and alkyl ether phosphates.
• Cationic surfactants are alkylamines, Al kyldiamine, alkyl ether amines, alkyl quaternary ammonium dialkyl quaternary ammonium and ester quaternary ammonium compounds.
• Viscoelastic surfactants may also have zwitterionic character or amphoteric properties. These include alkylbetaines, alkylamidobetaines, alkylamidazolines, alkylamino oxides and alkyl quaternary ammonium carboxylates.
• a further use according to the invention consists in the reduction of rock permeability and in particular for reducing the inflow of water into subterranean rock formations in the exploitation of underground oil and / or natural gas deposits.
• At least one representative of the salts of aromatic acids which contain at least two aromatic ring systems or at least two acid functionalities and in particular alkali salts, ammonium salts and organoammonium salts, particularly preferably without the addition of further reactive components, are pumped into the rock formation to be treated.
• the acids are at least one member of the series 2-naphthoic acid, phthalic acid, isophthalic acid or terephthalic acid.
• salts of the aromatic acids are pumped into the rock formation to be modified.
• the usually higher-value cations such as.
• the selected organic salts are irreversible and can not be brought into solution by increasing the ambient temperature.
• the use of the free corresponding acids is used according to the invention to control the acid inflow into rock formations during acidizing treatments.
• the described salt solutions are optionally pumped into the rock formation to be treated with the addition of viscosity-increasing additives. Due to the viscosity of the treatment fluid, the salt solution preferably enters the parts of the rock formation which have an increased permeability.
• Melting point of benzoic acid up to a max. Formation temperature of 80 0 C can be used, the systems of the invention are well above 150 0 C. effective.
• the free acid is added to the Acidizing Fluid in flaky form to seal coarse-pored rock formations against the entry of acid.
• the flakes can cover a relatively broad particle size range and be between 3 and 100 mesh. Preference is given to scale sizes between 8 and 12 mesh and in particular between 12 and 20 mesh, wherein the size need not be uniform, but may cover the areas mentioned in different proportions.
• Preparation Examples 1. 200 g of terephthalic acid were suspended in 400 ml of water. Subsequently, it was neutralized with about 15 g of tetraethylenepentamine until a pH of 7 was reached.
• Gildehaus sandstone with a porosity of 20.3% and a gas permeability of 2285 mD and an initial water permeability of 2043 mD was mixed with formation water (4.26 & CaCl 2 , 1, 5% MgCl 2 , 1 10 ppm NaHCO 3 , 270 ppm NaSO 4 , 380 ppm NaBO 2 XH 2 O).
• formation water (4.26 & CaCl 2 , 1, 5% MgCl 2 , 1 10 ppm NaHCO 3 , 270 ppm NaSO 4 , 380 ppm NaBO 2 XH 2 O).
• the sandstone sample was loaded in a hater cell with a 10% solution of sodium terephthalate and a flow rate of 1 ml / h. A volume of 4 ml_ (38% of the pore volume was pumped). The temperature was 50 ° C.
• the sample was subjected to 2.5 ml / h of formation water, the system was allowed to stand for 15 h and then again charged with 1 ml / h of formation water. Subsequently, formation water and saline solution were mutually fed at a flow rate of 1 mL / h, and then again charged with a pore volume of the saline solution described in Preparation Example 1. The water permeability of the rock decreased by 78%.
• the suspensions were heated to 90 0 C to determine whether the lessnesszipi arrangementen or- ganic acids go into solution again. Significant dissolution of the free acids at this temperature could not be observed.

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• Chemical & Material Sciences (AREA)
• Life Sciences & Earth Sciences (AREA)
• General Life Sciences & Earth Sciences (AREA)
• Engineering & Computer Science (AREA)
• Materials Engineering (AREA)
• Organic Chemistry (AREA)
• Chemical Kinetics & Catalysis (AREA)
• General Chemical & Material Sciences (AREA)
• Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
• Sewage (AREA)
• Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)

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• 2010
  • 2010-06-14 CA CA2768620A patent/CA2768620A1/en not_active Abandoned
  • 2010-06-14 BR BR112012003035A patent/BR112012003035A2/pt not_active IP Right Cessation
  • 2010-06-14 EA EA201200268A patent/EA201200268A1/ru unknown
  • 2010-06-14 EP EP10725171A patent/EP2464707A1/de not_active Withdrawn
  • 2010-06-14 KR KR1020127006265A patent/KR20120062760A/ko not_active Application Discontinuation
  • 2010-06-14 AU AU2010281809A patent/AU2010281809B2/en not_active Ceased
  • 2010-06-14 US US13/384,660 patent/US20120142562A1/en not_active Abandoned
  • 2010-06-14 JP JP2012524163A patent/JP2013501832A/ja active Pending
  • 2010-06-14 MX MX2012001431A patent/MX2012001431A/es not_active Application Discontinuation
  • 2010-06-14 WO PCT/EP2010/058304 patent/WO2011018257A1/de active Application Filing
  • 2010-06-14 CN CN2010800355634A patent/CN102471674A/zh active Pending
• 2012
  • 2012-03-07 ZA ZA2012/01675A patent/ZA201201675B/en unknown
  • 2012-03-09 EC ECSP12011715 patent/ECSP12011715A/es unknown

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