EP0804383A1 - Solutions de silicate - Google Patents

Solutions de silicate

Info

Publication number
EP0804383A1
EP0804383A1 EP96900640A EP96900640A EP0804383A1 EP 0804383 A1 EP0804383 A1 EP 0804383A1 EP 96900640 A EP96900640 A EP 96900640A EP 96900640 A EP96900640 A EP 96900640A EP 0804383 A1 EP0804383 A1 EP 0804383A1
Authority
EP
European Patent Office
Prior art keywords
silicate
solution
weight
agent
hydroxide
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP96900640A
Other languages
German (de)
English (en)
Inventor
Malcolm John Thorpe
Philip George Hughes
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Imperial Chemical Industries Ltd
Original Assignee
Brunner Mond and Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Brunner Mond and Co Ltd filed Critical Brunner Mond and Co Ltd
Publication of EP0804383A1 publication Critical patent/EP0804383A1/fr
Withdrawn legal-status Critical Current

Links

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
    • C09K8/02—Well-drilling compositions
    • C09K8/04—Aqueous well-drilling compositions
    • C09K8/14—Clay-containing compositions
    • C09K8/16—Clay-containing compositions characterised by the inorganic compounds other than clay
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B33/00—Silicon; Compounds thereof
    • C01B33/20—Silicates
    • C01B33/32—Alkali metal silicates

Definitions

  • the present invention relates to alkali metal silicate solutions and more particularly, but not exclusively, to such solutions for use in oil industry applications, e.g. for use in drilling fluids, drilling muds, and oil well working fluids, all referred to generically herein as drilling fluids.
  • Alkali metal silicate solutions were extensively used in the oil industry for such applications over a period of many years. However more recently they have for the large part been superseded by more sophisticated fluids with improved properties. These fluids are however now giving rise to environmental concerns so that silicate solutions may come back into favour.
  • Silicate solutions do however have the disadvantage that they gel or form precipitates on reaction with divalent metal ions (e.g. Ca 2 ' and Mg 2 + ) which are contained in groundwater and seawater. This is obviously an unwanted reaction which limits the usefulness of silicate solutions in oil industry applications.
  • divalent metal ions e.g. Ca 2 ' and Mg 2 +
  • an alkali metal silicate solution containing an agent effective to inhibit precipitation or gelation of said silicate in the solution in the presence of divalent metal ions wherein said agent is a water soluble inorganic compound containing a univalent cation other than the cation of the alkali metal silicate and an anion effective to inhibit said precipitation or gelation.
  • the inorganic compound (also referred to herein as the 'inhibiting agent') may be one for which the anion prevents gelation or precipitation of the silicate either by
  • the anion is preferably hydroxide, carbonate or phosphate.
  • Two or more inorganic compounds may be used as the inhibition agent to provide a combination of such anions.
  • phosphate as used herein is used as a generic name for a group o: compounds sucn as (but not exclusively) phosphates, orthophospnates, metaphosphates, polyphosphates, pyrophosphates, etc, but for t rie purposes of the present specification excludes hydrogen phosphates and dihydrogen pnosphates.
  • the inhibiting agent is preferaolv a pyrophosphate or polyphosphate.
  • the univalent cation is an alkali metal. If the alkali metal silicate is sodium s-licate then the cation ( of the inhibiting agent) is other than sodium ar. ⁇ is preferably potassium.
  • the cation of the aikali metal silicate is different from that of the inhibiting agent for solubility reasons.
  • an alkali metal hydroxide in conjunction with a phosphate or carbonate is particularly advantageous since the hydroxide provides not only enhanced inhibition of precipitation or gelation of the silicate but also lowers the viscosity of the solution without effecting other properties thereof.
  • an alkali metal hydroxide, in conjunction with a phosphate or carbonate allows the viscosity of the solution to ne tailored to specific needs.
  • preferred inhibiting agents for use in the invention include carbonates and/or phosphates.
  • the preferred phosphate for use in accordance with the second aspect of the invention is pyrophosphate or polyphosphate.
  • compositions in accordance with the second aspect of the invention it is preferred (but not essential) that the cation of the inhibition agent is other than the cation of the alkali metal silicate.
  • compositions in accordance with the second aspect of tne invention preferably also include the hydroxides of a univalent cation as a viscosity modifier.
  • the invention (both first and second aspects) is applicable mcst particularly to sodium silicate solutions.
  • the silicate may have a wide range of Si0 2 :M 2 0 weight ratios, typically 1.6:1 to 3.6:1.
  • the preferred inhibiting agents are hydroxides, phosphates and carbonates.
  • t .e latter two agents phosphate and carbonate
  • hydroxide is to be used as the sole inhibiting agent then it is most effective at Si0 2 :N ' a-C ratios of 2.5:1 to 3.6:1.
  • alkali metal silicate solids will comprise 30 to 99% (preferably 50 to 99%) by weight of the total weight of tr.e alkali metal silicate solids and inhibition agent which will correspondingly be 1 to 70% (preferably 1 to 50%) by weight on the same basis.
  • the solution comprises 15 to 55% by weight of tnc inhibition agent based on the total weight of solids (silicate plus inhibition agent).
  • the amount of carbonate or phosphate is determined by reference to the Si0 2 :Na,C weight ratio (assuming the silicate is sodium silicate) in accordance with the following Table 1.
  • the amount of inhibition agents is expressed as a percentage of the total amount of silicate plus inhibition agent. If the inhibition agent comprises a hydroxide plus at least one otner inhibition agent (e.g. carbonate and/or phosphate) then it is preferred that the hydroxide comprises up to 10% by weight of total solids ( inhibition agent plus silicate) and the other inhibition agent comprises 15% to 60% on the same basis.
  • the amount of the 'other ' inhibition agent is determined by reference to tn ⁇ 5i0 2 :N ' a-,0 weight ratio (assuming the silicate is sodium silicate) in accordance with the following table.
  • the amounts of hydroxide and 'other' inhibition agent are expressed as percentages of the total amount of silicate, hydroxide and 'other' inhibition agent.
  • the use of a hydroxide as the sole inhibition agent is limited by its ability to reduce the degree of polymerisation within the solution.
  • the preferred amount of the hvdroxide is 1 to 20% by weight (based on the total weigh t of the hy ⁇ roxide (e.g. alkali metal hydroxide ) and silicate), more preferably 2 to 12% on the same basis.
  • Solutions in accordance with the invention may be produced in a wide range of concentrations. It will however generally be most convenient initially to formulate more concentrated solutions for transport to the site at which the solution is to be used and then to dilute the "concentrate" down to the required use strength. If the inhibiting agent is a carbonate or hydroxide then such a concentrate may conveniently be prepared by mixing a commercial grade of silicate solution (which would generally contain 35% to 55% by weight solids) with a solution of appropriate strength of the carbonate or hydroxide.
  • the inhibiting agent is a phosphate
  • Alkali metal silicate solutions in accordance with the invention are particularly suitable for use in oil industry applications.
  • the solutions may be formulated into drilling fluids (including drilling muds clear drilling fluids, workover fluids, and oil well working fluids).
  • drilling fluids including drilling muds clear drilling fluids, workover fluids, and oil well working fluids.
  • Such fluids may comprise up to 25% by weight, more usually 5-10% by weight, of alkali metal silicate.
  • the fluids may, for example, be used in shale stabilisation processes.
  • a silicate solution (designated Sample 1) in accordance with the invention was prepared by mixing 0.2 g 50% w/w potassium hydroxide solution and 1 g tetrapotassium pyrophosphate in 88.8 g deionised water, adding 10 g of Q79 sodium silicate solution (available ex Brunner Mond) and stirring for 2 minutes.
  • Q79 has a Si0 2 :Na 2 0 weight ratio of 3.3 and a silicate solids content of 38.1% by weight.
  • the tolerance of the solution to precipitation and/or gelation of the silicate was determined by titrating the solution with synthetic seawater whilst measuring the turbidity of the solution by light transmission. The end point was determined by the point at which light dispersion causes a drop in transmitted light due to the intervention of particulate matter.
  • the synthetic seawater used in this procedure had the composition shown in the Handbook of Chemistry and Physics, 58th Edition, F-203 save that components having a concentration less than 100 ppm were excluded.
  • a further sample (Sample 2) in accordance with the invention was prepared by the same procedure but using 0.2 g 50% w/w potassium hydroxide solution, 2 g tetrapotassium pyrophosphate, 87.8 g deionised water and 10 g of Q79 sodium silicate solution. The tolerance to precipitation and/or gelation was measured as previously.
  • Sample 4 which contained neither potassiurr, hydroxide nor tetrapotassium pyrophosphate was prepared and its tolerance also measured.
  • a silicate solution was prepared by taking 1 g 50% w/w potassiu hydroxide and 10 g 50% tetrasodium pyrophosphate with 30 g deionis water, adding 50 g Q79 sodium silicate and stirring for 2 minutes.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Dispersion Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Silicates, Zeolites, And Molecular Sieves (AREA)
  • Detergent Compositions (AREA)
  • Emulsifying, Dispersing, Foam-Producing Or Wetting Agents (AREA)

Abstract

Solution de silicate de métal alcalin qui contient un agent efficace pour inhiber la précipitation ou la gélification du silicate dans la solution en présence d'ions métalliques divalents. Ledit agent est un composé inorganique hydrosoluble contenant un cation monovalent autre que le cation du silicate de métal alcalin et un anion efficace pour inhiber ladite précipitation ou gélification.
EP96900640A 1995-01-20 1996-01-22 Solutions de silicate Withdrawn EP0804383A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB9501099 1995-01-20
GBGB9501099.7A GB9501099D0 (en) 1995-01-20 1995-01-20 Silicate solutions
PCT/GB1996/000126 WO1996022245A1 (fr) 1995-01-20 1996-01-22 Solutions de silicate

Publications (1)

Publication Number Publication Date
EP0804383A1 true EP0804383A1 (fr) 1997-11-05

Family

ID=10768297

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96900640A Withdrawn EP0804383A1 (fr) 1995-01-20 1996-01-22 Solutions de silicate

Country Status (6)

Country Link
EP (1) EP0804383A1 (fr)
AU (1) AU4454596A (fr)
CA (1) CA2210873A1 (fr)
GB (1) GB9501099D0 (fr)
NO (1) NO973334L (fr)
WO (1) WO1996022245A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0770661A1 (fr) * 1995-10-27 1997-05-02 B W Mud Limited Lubrifiant pour boue de forage
EP1780185A1 (fr) * 2005-10-25 2007-05-02 Services Pétroliers Schlumberger Additif versatile pour la cimentation de puits
CN105439160A (zh) * 2015-11-29 2016-03-30 洛阳绿仁环保设备有限公司 利用钾长石制备硅酸钾的方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5176305A (en) * 1974-09-27 1976-07-01 Procter & Gamble Pirorinsanen keisanenkei senzaiseihin oyobi sonoseizoho
JPS51132202A (en) * 1975-02-14 1976-11-17 Procter & Gamble Making method of silicateepyrophosphate detergent composition
JPS5249209A (en) * 1975-07-23 1977-04-20 Procter & Gamble Pyrophosphateealuminosilicate detergent composition of high water silicate content
US4019998A (en) * 1974-09-27 1977-04-26 The Procter & Gamble Company Process for preparing a pyrophosphate-silicate detergent product
JPS59135294A (ja) * 1982-09-07 1984-08-03 ザ，プロクタ−，エンド，ギヤンブル，カンパニ− ピロホスフエ−トおよびポリアクリレ−ト重合体を含有する粒状洗剤

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2387694A (en) * 1936-03-27 1945-10-23 Truman B Wayne Treatment of drilling fluids
US2304232A (en) * 1936-06-06 1942-12-08 Nat Lead Co Method and means for controlling drilling muds
US2377309A (en) * 1944-02-14 1945-06-05 Tide Water Associated Oil Comp Drilling mud
JPS5849585B2 (ja) * 1978-07-10 1983-11-05 日本化学工業株式会社 土質安定化法
JPS5575481A (en) * 1978-12-01 1980-06-06 Ohbayashigumi Ltd Soil stabilizer
US4391643A (en) * 1981-05-21 1983-07-05 Halliburton Company Rapidly dissolvable silicates and methods of using the same
EP0231415B1 (fr) * 1986-02-05 1990-03-28 Henkel Kommanditgesellschaft auf Aktien Agent d'étanchéification, de consolidation ou liant, à base de solutions de silicate alcalins modifiés

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5176305A (en) * 1974-09-27 1976-07-01 Procter & Gamble Pirorinsanen keisanenkei senzaiseihin oyobi sonoseizoho
US4019998A (en) * 1974-09-27 1977-04-26 The Procter & Gamble Company Process for preparing a pyrophosphate-silicate detergent product
JPS51132202A (en) * 1975-02-14 1976-11-17 Procter & Gamble Making method of silicateepyrophosphate detergent composition
JPS5249209A (en) * 1975-07-23 1977-04-20 Procter & Gamble Pyrophosphateealuminosilicate detergent composition of high water silicate content
JPS59135294A (ja) * 1982-09-07 1984-08-03 ザ，プロクタ−，エンド，ギヤンブル，カンパニ− ピロホスフエ−トおよびポリアクリレ−ト重合体を含有する粒状洗剤

Non-Patent Citations (6)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Week 7633, Derwent World Patents Index; *
DATABASE WPI Week 7701, Derwent World Patents Index; Class D25 *
DATABASE WPI Week 7718, Derwent World Patents Index; *
DATABASE WPI Week 7722, Derwent World Patents Index; *
DATABASE WPI Week 8437, Derwent World Patents Index; Class A14 *
See also references of WO9622245A1 *

Also Published As

Publication number Publication date
GB9501099D0 (en) 1995-03-08
NO973334L (no) 1997-09-08
CA2210873A1 (fr) 1996-07-25
WO1996022245A1 (fr) 1996-07-25
AU4454596A (en) 1996-08-07
NO973334D0 (no) 1997-07-18

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