US20140290951A1 - Filtercake removal using exothermic in-situ nitrogen-producing reactants - Google Patents

Filtercake removal using exothermic in-situ nitrogen-producing reactants Download PDF

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Publication number
US20140290951A1
US20140290951A1 US14/227,079 US201414227079A US2014290951A1 US 20140290951 A1 US20140290951 A1 US 20140290951A1 US 201414227079 A US201414227079 A US 201414227079A US 2014290951 A1 US2014290951 A1 US 2014290951A1
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United States
Prior art keywords
filtercake
acid
nitrogen
injected
wellbore
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Abandoned
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US14/227,079
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English (en)
Inventor
Ali A. Al-Taq
Habeeb H. Haji
Jaffar Abdulla Saleem
Ayman R. Al-Nakhli
Duane Bevan Ragbir
Zadson De Almeida Franco
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Saudi Arabian Oil Co
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Saudi Arabian Oil Co
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Publication date
Application filed by Saudi Arabian Oil Co filed Critical Saudi Arabian Oil Co
Priority to US14/227,079 priority Critical patent/US20140290951A1/en
Publication of US20140290951A1 publication Critical patent/US20140290951A1/en
Abandoned legal-status Critical Current

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    • 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
    • C09K8/52—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B37/00—Methods or apparatus for cleaning boreholes or wells
    • E21B37/06—Methods or apparatus for cleaning boreholes or wells using chemical means for preventing or limiting, e.g. eliminating, the deposition of paraffins or like substances

Definitions

  • This invention relates generally to a process for the removal of filtercake from oil wells producing medium to heavy oil, and also oil wells found in low draw-down pressure reservoirs. More particularly, the present invention relates to a process for a filtercake breaker system achieved by a theromochemical reaction.
  • the drilling fluid In the drilling of oil wells, the drilling fluid is used to aid in the drilling of boreholes into the earth.
  • the liquid drilling fluids which are often referred to as drilling muds, are classified into three main types of muds. They are:
  • the drilling fluid serves many roles, including providing a hydrostatic pressure to prevent the fluids in the formation from entering into the wellbore, keeping the drill bit cool and clean during the drilling operation, the carrying out of drill cuttings and to suspend the drill cuttings when drilling is halted during removal and re-entry of the drilling assembly.
  • the particular drilling fluid or mud that is employed is chosen carefully for its particular function in to order avoid damage to the reservoir formation, limit corrosion and determine filtration rate and filtercake properties.
  • reservoir drilling fluid is circulated within the drilling equipment to cool the drill bit, reduce friction between the drill string and the sides of the borehole, and also to form a filtercake to prevent filtrate leak-off into the formation.
  • the driving force for the formation of the filtercake is the higher pressure applied to maintain the stability of the borehole.
  • the filtercake that is formed serves to restrict the inflow of fluids into the wellbore during the drilling process and to set the stage for the completion of the well.
  • Cake properties such as thickness, toughness, slickness and permeability are important because the cake that forms on permeable zone in the wellbore, can cause the pipe to stick and other drilling problems. If the filtercake damage created during the drilling process is not removed prior to or during completion of the well, reservoir productivity will be compromised.
  • xanthan molecules are degraded using an xanthanase enzyme complex that is stable at temperatures above 250° F., such as those temperatures that are found in some wellbores and process streams.
  • the xanthanase enzyme complex is produced by a novel soil bacterium.
  • the xanthanase enzyme complex may be used to remove xanthan based formation damage, such as drilling filtercakes and filtrates, or to remove xanthan based filtercakes and/or residues which are present in processing equipment.
  • the xanthanase enzyme complex may also be used to reduce the viscosity of xanthan-containing fluids, such as hydraulic fracturing fluids, blocking gels, drilling muds, and process fluids.
  • the xanthanase enzyme complex may also be used in conjunction with other well or process treatments, such as stimulation and cementing operations, to improve the effectiveness of these treatments.
  • U.S. Pat. No. 6,818,594 which is incorporated herein by reference, proposes methods and related compositions for altering the physical and chemical properties of the substrate used in hydrocarbon exploration, such as in downhole drilling operations.
  • a method is disclosed which involves formulating a fluid tailored to the specific drilling conditions that contain one or more inactivated enzymes.
  • the enzyme is an activated by encapsulation and pH responsive material.
  • one or more triggering signals such as a change in pH, is applied to the fluid that will activate or reactivate the inactivated enzyme, preferably by causing it to be released from the encapsulation material.
  • the reactivated enzyme is capable of selectively acting upon a substrate located downhole to bring about the desired change in the chemical or physical properties of the substrate.
  • the method consists of pumping the treatment fluid downhole in contact with the filtercake to be removed to establish a differential pressure between the treatment fluid and the formation adjacent the filtercake, and evenly propagating treatment of the filtercake during the differential pressure period so as to delay the breakthrough by the treatment fluid for a period of from 1 to 12 hours.
  • the treatment fluid comprises a fluoride source containing a 1.2 to 5 molar fluoride concentration, and another acid or combination of acids to provide a pH between 1.8 and 5.
  • a method and composition for removing filtercake is disclosed.
  • a multifunctional fluid is disclosed that addresses a new concept in the removal of filtercake.
  • a composition is disclosed which comprises a carrier fluid, a surfactant, a fluorine source and an organic stabilizer which is able to minimize the precipitation of fluorine.
  • U.S. Pat. No. 7,709,421 which is incorporated herein by reference, which discloses a single phase microemulsion to improve the removal of filter cakes formed during drilling with oil-based muds.
  • the single phase microemulsion removes oil and solids from the deposited filter cake.
  • an acid capable of solubilizing the filter cake bridging particles may also be used with the microemulsion.
  • the acid may be a polyamino carboxylic acid. Skin damage removal from internal and external filter cake deposition can be reduced.
  • the single phase microemulsion may contain a filtration control additive for delaying the filter cake removal, its destruction or its conversion.
  • the invention provides a method and a composition for removing filtercake from wells producing heavy to medium oil utilizing a thermochemical reaction mechanism.
  • An exothermic chemical reaction is initiated downhole when two (2) added nitrogen-containing water-soluble salts are contacted with an acid to liberate nitrogen gas and heat.
  • the placement of the reactants includes injecting one nitrogen salt with the acid through coiled tubing, while injecting the second salt by itself through the production tubing.
  • the reaction results in the generation of heat and nitrogen gas which effectively removes the filtercake from the formation in the wellbore.
  • the heat generated reduces the viscosity of the oil, thereby enhancing its mobility and the nitrogen gas generated reduces the hydrostatic pressure of the oil column.
  • the generated heat and the nitrogen will also improve dissolution of the filtercake by the acid. Both actions result in an improved clean-up of the wellbore. This effectiveness of the treatment will be more pronounced with heavy oil and also in low draw-down reservoirs. This method also has a positive impact on oil well productivity.
  • FIG. 1 depicts the apparatus employed in the practice of the process of the present invention
  • FIG. 2 is a typical filtration curve associated with filtrate invasion and depictions of the filtercake formation
  • FIGS. 2A and 2B are, respectively, schematic illustrations representative of the filtercake before and after treatment in accordance with the process of the present invention
  • FIGS. 3A , 3 B and 3 C, 3 D are, respectively, illustrations representative of photographs of a laboratory filter element coated with a filtercake before and after treatment in accordance with the invention
  • FIG. 4 is a temperature profile of the process of the present invention in the High Pressure/High Temperature Filter Press.
  • FIG. 5 is a pressure profile of the process of the present invention in the High Pressure/High Temperature Filter Press.
  • the invention provides a method and composition to remove filtercake damage from wells producing heavy to medium oil.
  • the method provides the optimal conditions for filtercake removal treatments.
  • the system contains two nitrogen containing salts in addition to an organic acid which functions to dissolve the carbonate material present in the filtercake.
  • the process of the invention thus provides for the simultaneous dissolution of the filtercake and the generation of heat and nitrogen gas.
  • the temperature of the reaction can be from about 80° C. to about 150° C., with a temperature of 100° C. to about 120° C. being preferred.
  • the method of the present invention has the following advantages:
  • the present invention also aids in solving several problems in the removal of filtercake damage from wells producing heavy to medium oil, including the following:
  • FIG. 1 is a schematic representation of the method of the present invention, wherein an oil bearing zone 10 is depicted having a well 11 extending into the zone.
  • Production tubing 12 and a coiled tubing 13 extend down into a wellbore 14 which extends into the oil bearing zone 10 .
  • a filter cake 15 is formed at the bottom of well casing 16 where the filtercake 15 meets the oil bearing reservoir 10 .
  • Shown in the illustrations of FIGS. 2A and 2B is the build-up of internal and, then later, the external filtercake which must be removed to improve the flow of hydrocarbons from the reservoir rock.
  • Sodium nitrite and 15 vol. % acetic acid are injected through the production tubing 12 , while ammonium chloride is injected via a pump 17 through the coiled tubing 13 .
  • the rate of injection of the sodium nitrite +15% vol. acetic acid is at about twice the rate of the ammonium chloride injection. While 15% vol. acetic acid is preferred
  • 10 vol % to 12 vol % can be used to advantage and the acid employed can be selected from the group consisting of formic acid, propionic acid, lactic acid and benzoic acid.
  • N/HGS Nitrogen/Heat Generation System
  • FIG. 3 provides support that the process of the present invention (N/HGS) is very effective as a filtercake breaker system and the obtained returned permeability of 81% is well justified.
  • the process of the present invention which is a nitrogen and heat generating system (N/HGS)
  • N/HGS nitrogen and heat generating system
  • FIGS. 3A and 3B show a circular laboratory filter disc test element that contains a filtercake on the upper surface of uniform thickness and consistency before being subjected to the treatment in accordance with the process of the invention.
  • the filtercake of FIGS. 3C , 3 D has fissures and has been loosened and removed from the filter medium in some areas.
  • Example 1 The same testing procedure that was used in Example 1 with the HP/HT filter press was used to generate the temperature and pressure profiles shown in FIGS. 4 and 5 .
  • the results obtained show that significant heat generation and nitrogen production which was observed as pressure increased is associated with the exothermic reaction of the N/HGS components.
  • This example is representative of the process of the present invention.
  • Pill A whose composition is set forth in Table 1 below
  • Pill B whose composition is identified in Table 1 below
  • Pill A is injected at twice the rate of Pill B.
  • Pill as used here means batch or mixture.
  • Pill A and Pill B consisting of the ingredients in Table 2 below were injected through the production tubing, 12
  • Pill C which consists of the ingredients recited in Table 2
  • Pill C which consists of the ingredients recited in Table 2
  • Well C shows the highest oil rate following N/HGS treatment. If it is assumed that well C has a flow rate of 1,000 bbls/day, then well B will have a flow rate of 780 bbls/day and well A will have a flow rate of 570 bbls/day.

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Filtering Materials (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)
  • Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
US14/227,079 2013-04-01 2014-03-27 Filtercake removal using exothermic in-situ nitrogen-producing reactants Abandoned US20140290951A1 (en)

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Cited By (13)

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WO2016137854A1 (fr) * 2015-02-23 2016-09-01 Saudi Arabian Oil Company Système d'émulsion utilisant de l'azote et de la chaleur pour traiter un blocage d'eau profonde
US20160264859A1 (en) * 2014-04-17 2016-09-15 Saudi Arabian Oil Company Composition For Enhanced Fracture Cleanup Using Redox Treatment
US20160319182A1 (en) * 2014-04-17 2016-11-03 Saudi Arabian Oil Company Compositions For Enhanced Fracture Cleanup Using Redox Treatment
US20170167211A1 (en) * 2015-12-10 2017-06-15 Saudi Arabian Oil Company Downhole in-situ heat generation to remove filtercake
CN107218012A (zh) * 2017-07-27 2017-09-29 中国石油集团渤海钻探工程有限公司 一种油气井热n2解堵工艺方法及装置
WO2017196926A1 (fr) * 2016-05-10 2017-11-16 Board Of Regents, The University Of Texas System Procédés d'augmentation de la résistance d'un puits de forage
US10151186B2 (en) * 2015-11-05 2018-12-11 Saudi Arabian Oil Company Triggering an exothermic reaction for reservoirs using microwaves
US10308862B2 (en) 2014-04-17 2019-06-04 Saudi Arabian Oil Company Compositions and methods for enhanced fracture cleanup using redox treatment
WO2021188125A1 (fr) * 2020-03-20 2021-09-23 Saudi Arabian Oil Company Réduction de la pression de rupture par élimination du gâteau de filtration à l'aide de composés thermochimiques
US11407929B2 (en) 2019-07-24 2022-08-09 King Fahd University Of Petroleum And Minerals Barite-quartz and calcite-quartz filter cake removal method
US11414972B2 (en) 2015-11-05 2022-08-16 Saudi Arabian Oil Company Methods and apparatus for spatially-oriented chemically-induced pulsed fracturing in reservoirs
US20230313023A1 (en) * 2022-04-04 2023-10-05 Saudi Arabian Oil Company Removal of filter cake
US20240068328A1 (en) * 2022-08-30 2024-02-29 Saudi Arabian Oil Company Exothermic drilling fluid composition and method of use

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WO2018052280A1 (fr) 2016-09-15 2018-03-22 Schlumberger Technology Corporation Compositions et procédés pour l'entretien des puits souterrains
US11208588B1 (en) 2020-11-05 2021-12-28 Saudi Arabian Oil Company Methods of dissolving gas hydrates
US11518924B2 (en) 2020-11-05 2022-12-06 Saudi Arabian Oil Company Methods of dissolving gas hydrates
US11466195B2 (en) 2020-11-05 2022-10-11 Saudi Arabian Oil Company Methods of dissolving gas hydrates
US11981863B2 (en) 2022-05-17 2024-05-14 Saudi Arabian Oil Company Method and composition to enhance the performance of encapsulated breakers
US11866643B1 (en) 2022-10-20 2024-01-09 Saudi Arabian Oil Company Method and composition to remove liquid build up in gas wells

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US10308862B2 (en) 2014-04-17 2019-06-04 Saudi Arabian Oil Company Compositions and methods for enhanced fracture cleanup using redox treatment
US10442977B2 (en) 2014-04-17 2019-10-15 Saudi Arabian Oil Company Compositions and methods for enhanced fracture cleanup using redox treatment
US9963631B2 (en) * 2014-04-17 2018-05-08 Saudi Arabian Oil Company Composition for enhanced fracture cleanup using redox treatment
US10053614B2 (en) * 2014-04-17 2018-08-21 Saudi Arabian Oil Company Compositions for enhanced fracture cleanup using redox treatment
US10450499B2 (en) 2014-04-17 2019-10-22 Saudi Arabian Oil Company Compositions and methods for enhanced fracture cleanup using redox treatment
US20160319182A1 (en) * 2014-04-17 2016-11-03 Saudi Arabian Oil Company Compositions For Enhanced Fracture Cleanup Using Redox Treatment
US20160264859A1 (en) * 2014-04-17 2016-09-15 Saudi Arabian Oil Company Composition For Enhanced Fracture Cleanup Using Redox Treatment
US10442978B2 (en) 2014-04-17 2019-10-15 Saudi Arabian Oil Company Compositions and methods for enhanced fracture cleanup using redox treatment
US11458419B2 (en) 2015-02-23 2022-10-04 Saudi Arabian Oil Company Emulsion system utilizing nitrogen and heat to treat deep water blockage
CN107249710A (zh) * 2015-02-23 2017-10-13 沙特阿拉伯石油公司 利用氮和热来处理深度水堵的乳液体系
WO2016137854A1 (fr) * 2015-02-23 2016-09-01 Saudi Arabian Oil Company Système d'émulsion utilisant de l'azote et de la chaleur pour traiter un blocage d'eau profonde
US10151186B2 (en) * 2015-11-05 2018-12-11 Saudi Arabian Oil Company Triggering an exothermic reaction for reservoirs using microwaves
US11414972B2 (en) 2015-11-05 2022-08-16 Saudi Arabian Oil Company Methods and apparatus for spatially-oriented chemically-induced pulsed fracturing in reservoirs
US10677002B2 (en) 2015-12-10 2020-06-09 Saudi Arabian Oil Company Downhole in-situ heat generation to remove filtercake
US10400527B2 (en) * 2015-12-10 2019-09-03 Saudi Arabian Oil Company Downhole in-situ heat generation to remove filtercake
CN108463534A (zh) * 2015-12-10 2018-08-28 沙特阿拉伯石油公司 用于移除滤饼的井下原位热量生成
WO2017099896A1 (fr) * 2015-12-10 2017-06-15 Saudi Arabian Oil Company Génération de chaleur in situ en fond de trou pour éliminer un gâteau de filtration
US10677001B2 (en) 2015-12-10 2020-06-09 Saudi Arabian Oil Company Downhole in-situ heat generation to remove filtercake
US20170167211A1 (en) * 2015-12-10 2017-06-15 Saudi Arabian Oil Company Downhole in-situ heat generation to remove filtercake
WO2017196926A1 (fr) * 2016-05-10 2017-11-16 Board Of Regents, The University Of Texas System Procédés d'augmentation de la résistance d'un puits de forage
US11008832B2 (en) 2016-05-10 2021-05-18 Board Of Regents, The University Of Texas System Methods for increasing wellbore strength
US11767737B2 (en) 2016-05-10 2023-09-26 Board Of Regents, The University Of Texas System Methods for increasing wellbore strength
CN107218012A (zh) * 2017-07-27 2017-09-29 中国石油集团渤海钻探工程有限公司 一种油气井热n2解堵工艺方法及装置
US11407929B2 (en) 2019-07-24 2022-08-09 King Fahd University Of Petroleum And Minerals Barite-quartz and calcite-quartz filter cake removal method
WO2021188125A1 (fr) * 2020-03-20 2021-09-23 Saudi Arabian Oil Company Réduction de la pression de rupture par élimination du gâteau de filtration à l'aide de composés thermochimiques
US11339319B2 (en) 2020-03-20 2022-05-24 Saudi Arabian Oil Company Reduction of breakdown pressure by filter cake removal using thermochemicals
US20230313023A1 (en) * 2022-04-04 2023-10-05 Saudi Arabian Oil Company Removal of filter cake
US20240068328A1 (en) * 2022-08-30 2024-02-29 Saudi Arabian Oil Company Exothermic drilling fluid composition and method of use

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Publication number Publication date
WO2014165347A1 (fr) 2014-10-09
EP2981588B1 (fr) 2018-05-09
CA2904094C (fr) 2021-02-16
CA2904094A1 (fr) 2014-10-09
EP2981588A1 (fr) 2016-02-10

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