US4014174A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of simultaneously strengthening the surface of a borehole and bonding cement thereto and method of forming cementitious pilings
Assignee: Baroid Technology Inc
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Filing: 1975-10-28
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Granted: 1977-03-29
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Expires: 1995-10-28
Abstract
Abstract An improved method of consolidating the surface of a borehole in an incompetent formation and simultaneously strengthening the bond between the surface of the borehole and cement placed in the borehole is achieved by forcing an aqueous solution of a multivalent cation salt into the formation, thereafter forcing an alkali metal silicate solution which has a pH less than 12.0 containing at least 12% by weight silica into the formation, and thereafter forcing an aqueous cement slurry containing at least 2% by weight of a water soluble multivalent cation salt to contact the surface of the borehole. A cementitious piling intimately bonded to the formation is prepared by filing the stabilized borehole with an aqueous cement slurry and allowing the cement to harden.
Inventors
- 👤 Thomas C. Mondshine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 00:51
CPC Classifications
E; E02; E02D; E02D5/00; E02D5/22; E02D5/34; E02D5/36; E02D5/38; E02D5/40; E02D5/62
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
134 words
A method for simultaneously consolidating the surface of a borehole and bonding cement to the surface of said borehole, which comprises: a. placing an aqueous salt solution containing at least 0.5% of a multivalent cation salt into a borehole; b. forcing said salt solution into the formation surrounding said borehole; c. displacing said salt solution from said borehole; d. placing an alkali metal silicate solution which has a pH less than 12.0 containing at least 12 percent by weight silica within said borehole; e. forcing said silicate solution into said formation; f. displacing said silicate solution from said borehole; g. placing an aqueous cement slurry containing at least 2 percent by weight of a water soluble multivalent cation salt within said borehole; and h. forcing said cement to contact said surface of said borehole.
Claim 2
Independent Claim
134 words
A method for simultaneously consolidating the surface of a borehole and bonding cement to the surface of said borehole, which comprises: a. placing an aqueous salt solution containing at least 0.5% of a multivalent cation salt into a borehole; b. forcing said salt solution into the formation surrounding said borehole; c. displacing said salt solution from said borehole; d. placing an alkali metal silicate solution which has a pH less than 12.0 containing at least 12 percent by weight silica within said borehole; e. forcing said silicate solution into said formation; f. displacing said silicate solution from said borehole; g. placing an aqueous cement slurry containing at least 2 percent by weight of a water soluble multivalent cation salt within said borehole; and h. forcing said cement to contact said surface of said borehole.
Claim 3
Dependent Claim
32 words
The method of claim 1 wherein said salt solution is seawater, and wherein said alkali metal is sodium, and wherein said water soluble multivalent cation salt in said cement is calcium chloride.
Claim 4
Dependent Claim
16 words
The method of claim 2 wherein said silicate solution has a pH less than about 11.5.
Claim 5
Dependent Claim
16 words
The method of claim 3 wherein said cement contains at least 4% by weight calcium chloride.
Claim 6
Dependent Claim
22 words
The method of claim 4 wherein the stabilized borehole is filled with a cement slurry to form a piling in said formation.
Claim 7
Dependent Claim
22 words
The method of claim 2 wherein the stabilized borehole is filled with a cement slurry to form a piling in said formation.
Claim 8
Dependent Claim
24 words
The method of claim 6 wherein said cement slurry which contacts the surface of said borehole contains at least 4% by weight calcium chloride.
Claim 9
Dependent Claim
22 words
The method of claim 1 wherein the stabilized borehole is filled with a cement slurry to form a piling in said formation.
Claim 10
Dependent Claim
16 words
The method of claim 8 wherein said silicate solution has a pH less than about 11.5.
Claim 11
Independent Claim
140 words
A method for simultaneously consolidating the surface of a borehole and bonding cement to the surface of said borehole, wherein said borehole is within an incompetent formation beneath a body of seawater, and for forming a piling within said borehole, which comprises: a. placing an alkali metal silicate solution which has a pH less than 12.0 containing at least 12 percent by weight silica within said borehole; b. forcing said silicate solution into said formation; c. displacing said silicate solution from said borehole; d. placing an aqueous cement slurry containing at least 2% by weight of a water soluble multivalent cation salt within said borehole; e. forcing said cement to contact said surface of said borehole; and f. allowing said cement slurry to harden; wherein said borehole is filled with a cement slurry to form a piling in said formation.
Claim 12
Independent Claim
140 words
A method for simultaneously consolidating the surface of a borehole and bonding cement to the surface of said borehole, wherein said borehole is within an incompetent formation beneath a body of seawater, and for forming a piling within said borehole, which comprises: a. placing an alkali metal silicate solution which has a pH less than 12.0 containing at least 12 percent by weight silica within said borehole; b. forcing said silicate solution into said formation; c. displacing said silicate solution from said borehole; d. placing an aqueous cement slurry containing at least 2% by weight of a water soluble multivalent cation salt within said borehole; e. forcing said cement to contact said surface of said borehole; and f. allowing said cement slurry to harden; wherein said borehole is filled with a cement slurry to form a piling in said formation.
References Cited (Backward Citations)
US3884302A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-03-28 | 1980-09-27 | 1981-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-03-28 | 1984-09-27 | 1985-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-03-28 | 1988-09-27 | 1989-03-29 | $7700.00 | Window Closed / Lapsed |