WO1996022245A1 - Silicate solutions - Google Patents
Silicate solutions Download PDFInfo
- Publication number
- WO1996022245A1 WO1996022245A1 PCT/GB1996/000126 GB9600126W WO9622245A1 WO 1996022245 A1 WO1996022245 A1 WO 1996022245A1 GB 9600126 W GB9600126 W GB 9600126W WO 9622245 A1 WO9622245 A1 WO 9622245A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- silicate
- solution
- weight
- agent
- hydroxide
- Prior art date
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 However more recently they have for the large part been superseded by more sophisticated fluids with improved properties.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
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP96900640A EP0804383A1 (en) | 1995-01-20 | 1996-01-22 | Silicate solutions |
AU44545/96A AU4454596A (en) | 1995-01-20 | 1996-01-22 | Silicate solutions |
NO973334A NO973334L (en) | 1995-01-20 | 1997-07-18 | Silikatopplösninger |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GBGB9501099.7A GB9501099D0 (en) | 1995-01-20 | 1995-01-20 | Silicate solutions |
GB9501099.7 | 1995-01-20 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1996022245A1 true WO1996022245A1 (en) | 1996-07-25 |
Family
ID=10768297
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/GB1996/000126 WO1996022245A1 (en) | 1995-01-20 | 1996-01-22 | Silicate solutions |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP0804383A1 (en) |
AU (1) | AU4454596A (en) |
CA (1) | CA2210873A1 (en) |
GB (1) | GB9501099D0 (en) |
NO (1) | NO973334L (en) |
WO (1) | WO1996022245A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0770661A1 (en) * | 1995-10-27 | 1997-05-02 | B W Mud Limited | Lubricant for drilling mud |
WO2007048560A2 (en) * | 2005-10-25 | 2007-05-03 | Services Petroliers Schlumberger | Versatile additives for well cementing applications |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105439160A (en) * | 2015-11-29 | 2016-03-30 | 洛阳绿仁环保设备有限公司 | Method for preparing potassium silicate from potassium feldspar |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 |
US2387694A (en) * | 1936-03-27 | 1945-10-23 | Truman B Wayne | Treatment of drilling fluids |
JPS5512105A (en) * | 1978-07-10 | 1980-01-28 | Nippon Chem Ind Co Ltd:The | Soil stabilization |
JPS5575481A (en) * | 1978-12-01 | 1980-06-06 | Ohbayashigumi Ltd | Soil stabilizer |
GB2099412A (en) * | 1981-05-21 | 1982-12-08 | Halliburton Co | Rapidly dissolvable silicates and methods of using the same |
EP0231415A1 (en) * | 1986-02-05 | 1987-08-12 | Henkel Kommanditgesellschaft auf Aktien | Sealing, consolidating and/or binding agent based on modified alcaline silicate solutions |
-
1995
- 1995-01-20 GB GBGB9501099.7A patent/GB9501099D0/en active Pending
-
1996
- 1996-01-22 EP EP96900640A patent/EP0804383A1/en not_active Withdrawn
- 1996-01-22 CA CA 2210873 patent/CA2210873A1/en not_active Abandoned
- 1996-01-22 AU AU44545/96A patent/AU4454596A/en not_active Abandoned
- 1996-01-22 WO PCT/GB1996/000126 patent/WO1996022245A1/en not_active Application Discontinuation
-
1997
- 1997-07-18 NO NO973334A patent/NO973334L/en unknown
Patent Citations (7)
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 |
JPS5512105A (en) * | 1978-07-10 | 1980-01-28 | Nippon Chem Ind Co Ltd:The | Soil stabilization |
JPS5575481A (en) * | 1978-12-01 | 1980-06-06 | Ohbayashigumi Ltd | Soil stabilizer |
GB2099412A (en) * | 1981-05-21 | 1982-12-08 | Halliburton Co | Rapidly dissolvable silicates and methods of using the same |
EP0231415A1 (en) * | 1986-02-05 | 1987-08-12 | Henkel Kommanditgesellschaft auf Aktien | Sealing, consolidating and/or binding agent based on modified alcaline silicate solutions |
Non-Patent Citations (2)
Title |
---|
DATABASE WPI Section Ch Week 8010, Derwent World Patents Index; Class L02, AN 80-17475C, XP002002907 * |
PATENT ABSTRACTS OF JAPAN vol. 004, no. 119 (C - 022) 23 August 1980 (1980-08-23) * |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0770661A1 (en) * | 1995-10-27 | 1997-05-02 | B W Mud Limited | Lubricant for drilling mud |
WO2007048560A2 (en) * | 2005-10-25 | 2007-05-03 | Services Petroliers Schlumberger | Versatile additives for well cementing applications |
WO2007048560A3 (en) * | 2005-10-25 | 2007-07-19 | Schlumberger Services Petrol | Versatile additives for well cementing applications |
US7946343B2 (en) | 2005-10-25 | 2011-05-24 | Schlumberger Technology Corporation | Versatile additives for well cementing applications |
EA017220B1 (en) * | 2005-10-25 | 2012-10-30 | Шлюмбергер Текнолоджи Б.В. | Versatile additive for inhibiting gelation, methods of preparing cement slurry and cementing subterranean zone using same |
Also Published As
Publication number | Publication date |
---|---|
CA2210873A1 (en) | 1996-07-25 |
NO973334L (en) | 1997-09-08 |
AU4454596A (en) | 1996-08-07 |
GB9501099D0 (en) | 1995-03-08 |
EP0804383A1 (en) | 1997-11-05 |
NO973334D0 (en) | 1997-07-18 |
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