CA1244640A - High temperature well cement composition - Google Patents
High temperature well cement compositionInfo
- Publication number
- CA1244640A CA1244640A CA000462625A CA462625A CA1244640A CA 1244640 A CA1244640 A CA 1244640A CA 000462625 A CA000462625 A CA 000462625A CA 462625 A CA462625 A CA 462625A CA 1244640 A CA1244640 A CA 1244640A
- Authority
- CA
- Canada
- Prior art keywords
- cement
- water
- composition
- high temperature
- cement composition
- 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.)
- Expired
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/24—Macromolecular compounds
- C04B24/38—Polysaccharides or derivatives thereof
- C04B24/383—Cellulose or derivatives thereof
-
- 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
- C09K8/42—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells
-
- 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
- C09K8/42—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells
- C09K8/46—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement
Landscapes
- 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)
- Ceramic Engineering (AREA)
- Inorganic Chemistry (AREA)
- Structural Engineering (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
HIGH TEMPERATURE WELL CEMENT COMPOSITION
Abstract of Disclosure Disclosed is a cement composition having impaired set retardation times comprising a hydraulic cement, water, and a partially water-soluble hydroxyethylcellulose having a M.S.
of 0.25 to 1.12, and an intrinsic viscosity in 5% sodium hydroxide at 25°C of from about 6.0 to about 9Ø The composition is useful cementing well casings in high temperature wells.
Abstract of Disclosure Disclosed is a cement composition having impaired set retardation times comprising a hydraulic cement, water, and a partially water-soluble hydroxyethylcellulose having a M.S.
of 0.25 to 1.12, and an intrinsic viscosity in 5% sodium hydroxide at 25°C of from about 6.0 to about 9Ø The composition is useful cementing well casings in high temperature wells.
Description
2742b 6~
This invention relates to a cement composition suitable for use in cementing well casings in high temperature wells.
Ln preparing a well for the recovery of oil, it is customary to cement the well casing in place by mixing a hydraulic cement and water to form a pumpable neat cement (as used herein cement means hydraulic cement~ slurry and pumping the cement slurry down through the well casing and up into the annular space between the well casing and porous earth wall of the borehole. In present-day well drilling, wells commonly run from 4,000 to 25,000 feet deep. At these depths, elevated temperatures from 170F to 500F are encountered. The high temperatures tend to accelerate the hydration or set of the cement. Hence, the cement frequently sets before it is in the place where it is desired to have it harden. In addition, deeper wells require more time to pump the cement into place. Therefore, the cement slurry must remain fluid and pumpable at the high temperatures for the period of time it takes to pump all of the cement into the desired location in the well. In order to prevent the cement from setting too quickly due to the high temperatures and increased pumping time, additives which retard the rate at which the cement thickens are added to the neat cement slurries.
A variety of cement retarder additives have been suggested. For example, the use of mixed cellulose ethers, such as methyl hydroxyethylcellulose (U.S. Patent No.
This invention relates to a cement composition suitable for use in cementing well casings in high temperature wells.
Ln preparing a well for the recovery of oil, it is customary to cement the well casing in place by mixing a hydraulic cement and water to form a pumpable neat cement (as used herein cement means hydraulic cement~ slurry and pumping the cement slurry down through the well casing and up into the annular space between the well casing and porous earth wall of the borehole. In present-day well drilling, wells commonly run from 4,000 to 25,000 feet deep. At these depths, elevated temperatures from 170F to 500F are encountered. The high temperatures tend to accelerate the hydration or set of the cement. Hence, the cement frequently sets before it is in the place where it is desired to have it harden. In addition, deeper wells require more time to pump the cement into place. Therefore, the cement slurry must remain fluid and pumpable at the high temperatures for the period of time it takes to pump all of the cement into the desired location in the well. In order to prevent the cement from setting too quickly due to the high temperatures and increased pumping time, additives which retard the rate at which the cement thickens are added to the neat cement slurries.
A variety of cement retarder additives have been suggested. For example, the use of mixed cellulose ethers, such as methyl hydroxyethylcellulose (U.S. Patent No.
2,629,667) and carboxymethyl hydroxyethylcellulose in combination with formaldehyde (U.S. Patent 3,197,316), in aqueous hydraulic cement compositions has been disclosed.
.? ~ ~
o T~e use of an admixture of a hydroxyalkyl cellulose ether having a degree o-f substitution (D.S.) from 0.25 to 2.5 and sodium chloride as a fluid-loss control agent in aqueous hydraulic cement compositions is taught in tJ. S. Patent No.
.? ~ ~
o T~e use of an admixture of a hydroxyalkyl cellulose ether having a degree o-f substitution (D.S.) from 0.25 to 2.5 and sodium chloride as a fluid-loss control agent in aqueous hydraulic cement compositions is taught in tJ. S. Patent No.
3,4S33,007.
However, for one reason or another, these additives have not been fully satisfactory, usually because cement compositions containing them give erratic thickening times at the higher temperatures encountered in the increasingly common deeper wells of today. Thus, a need exists for a more effective and consistant retarded cement composition.
The purpose of this invention is to provide an improved retarded cement composition which is particularly useful in high temperature wells.
The cement composition of the present invention comprises a hydraulic cement, water, and a partially water-soluble hydroxyethylcellulose having a M.S. of from about 0.25 to about 1.12, and an intrinsic viscosity in 5 sodium hydroxide at 25C of from about 6.0 to about 9Ø
Pl.S. is the average number of moles of ethylene oxide per anhydroglucose unit of the cellulose molecule.
Any hydraulic cement may be used. Typically the Portland or Pozzolan classes of hydraulic cement are used in oil well cementing. These cements are classified by the American Petroleum Institute (see API standard 10-A, 16th Edition, (1971)).
The composition may be prepared in any conventional manner. Preferably, the hydroxyethylcellulose is blended with the cement on site or in the factory prior to the addition of the dry mixture to water or the water to the dry mixture in a suitable mixer to form an aqueous hydraulic cement slurry.
The amount of water mixed with the cement to form the aqueous cement slurry varies depending in the particular API
class of cement being employed. Generally from about 38% to about ~2%, by weight of the dry cement, of water is used.
The amount used is well within the skill of the art.
The partially water-soluble hydxoxyethylcellulose has a M.S. of from about 0.25 -to about 1.12, preferably from about 0.5 to about 0.7, and an intrinsic viscosity in 5% sodium hydroxide at 25C of from about 6.0 to about 9Ø Tne partially water-soluble hydroxyethylcellulose is used in an amount from about 0.3% to about 2.0%, preferably from about 0.4% to about 0.8% by weight of the dry cement.
The partially water-soluble hydroxyethylcellulose for use in the practice of this invention may be prepared by trea-ting cellulose with sodium hydroxide and then reacting the treated cellulose with ethylene oxide.
Other conventional additives can be added to the composition of this invention, such as thinners to reduce its viscosity.
To further illustrate this invention, various illustrative examples are set forth below.
All parts and percentages used in this specification are by weight unless otherwise indicated.
Examples 1-4 These examples illustrate various embodiments of the cement composition of the present invention and how to prepare the cement composition of the present invention.
Six tenths percent (0.6%), by weight of the dry cement, ~ of hydroxyethylCao~e of varying M.S., and 860 grams of an `25 API Class H cement are added to a mixer and mixed until a homogenous blend is obtained. The blend is then added to another mixer containing 42% water and mixed together to form an aqueous cement slurry.
The thickening time and the solubility of the aqueous cement slurries prepared with hydroxyethylcellulose of varying M.S. in water are shown in the Table.
However, for one reason or another, these additives have not been fully satisfactory, usually because cement compositions containing them give erratic thickening times at the higher temperatures encountered in the increasingly common deeper wells of today. Thus, a need exists for a more effective and consistant retarded cement composition.
The purpose of this invention is to provide an improved retarded cement composition which is particularly useful in high temperature wells.
The cement composition of the present invention comprises a hydraulic cement, water, and a partially water-soluble hydroxyethylcellulose having a M.S. of from about 0.25 to about 1.12, and an intrinsic viscosity in 5 sodium hydroxide at 25C of from about 6.0 to about 9Ø
Pl.S. is the average number of moles of ethylene oxide per anhydroglucose unit of the cellulose molecule.
Any hydraulic cement may be used. Typically the Portland or Pozzolan classes of hydraulic cement are used in oil well cementing. These cements are classified by the American Petroleum Institute (see API standard 10-A, 16th Edition, (1971)).
The composition may be prepared in any conventional manner. Preferably, the hydroxyethylcellulose is blended with the cement on site or in the factory prior to the addition of the dry mixture to water or the water to the dry mixture in a suitable mixer to form an aqueous hydraulic cement slurry.
The amount of water mixed with the cement to form the aqueous cement slurry varies depending in the particular API
class of cement being employed. Generally from about 38% to about ~2%, by weight of the dry cement, of water is used.
The amount used is well within the skill of the art.
The partially water-soluble hydxoxyethylcellulose has a M.S. of from about 0.25 -to about 1.12, preferably from about 0.5 to about 0.7, and an intrinsic viscosity in 5% sodium hydroxide at 25C of from about 6.0 to about 9Ø Tne partially water-soluble hydroxyethylcellulose is used in an amount from about 0.3% to about 2.0%, preferably from about 0.4% to about 0.8% by weight of the dry cement.
The partially water-soluble hydroxyethylcellulose for use in the practice of this invention may be prepared by trea-ting cellulose with sodium hydroxide and then reacting the treated cellulose with ethylene oxide.
Other conventional additives can be added to the composition of this invention, such as thinners to reduce its viscosity.
To further illustrate this invention, various illustrative examples are set forth below.
All parts and percentages used in this specification are by weight unless otherwise indicated.
Examples 1-4 These examples illustrate various embodiments of the cement composition of the present invention and how to prepare the cement composition of the present invention.
Six tenths percent (0.6%), by weight of the dry cement, ~ of hydroxyethylCao~e of varying M.S., and 860 grams of an `25 API Class H cement are added to a mixer and mixed until a homogenous blend is obtained. The blend is then added to another mixer containing 42% water and mixed together to form an aqueous cement slurry.
The thickening time and the solubility of the aqueous cement slurries prepared with hydroxyethylcellulose of varying M.S. in water are shown in the Table.
-4-Table Thickening(a) Solubility in CementHydroxyethyl Time at water at room Slurry M.S. 200F, hrs. temperature, 5Control 12.76 1.9 99.9 Control 21.66 3.9 99.0 Example 11.12 5.8 77.6 Example 20.75 7.1 51.4 Example 30.57 7.2 25.6 10Example 40.25 3.2 21.5 (a)~etermined with a ~Ialliburton atmospheric pressure consistometer.
Thus, this invention provides cement compositions having improved set retardation times which reduce the risk of premature setting before the cement can be pumped into place in the wellbore.
The expression "consisting essentially of" as used in this specification excludes any unrecited substance at a concentration sufficient to substantially adversely affect the essential properties and characteristics of the composi-tion of matter being defined, while permitting the presence of one or more unrecited substances at concentrations insuf-ficient to substantially adversely affect said essential properties and characteristics.
Features, advantages and other specific embodiments of this invention will become readily apparent to those exercising ordinary skill in the art after reading the foregoing disclosures. In this regard, while specific embodiments of this invention have been described in considerable detail, variations and modifications of these embodiments can be effected without departing from the spirit and scope of the invention as disclosed and claimed.
, ~ .~
Thus, this invention provides cement compositions having improved set retardation times which reduce the risk of premature setting before the cement can be pumped into place in the wellbore.
The expression "consisting essentially of" as used in this specification excludes any unrecited substance at a concentration sufficient to substantially adversely affect the essential properties and characteristics of the composi-tion of matter being defined, while permitting the presence of one or more unrecited substances at concentrations insuf-ficient to substantially adversely affect said essential properties and characteristics.
Features, advantages and other specific embodiments of this invention will become readily apparent to those exercising ordinary skill in the art after reading the foregoing disclosures. In this regard, while specific embodiments of this invention have been described in considerable detail, variations and modifications of these embodiments can be effected without departing from the spirit and scope of the invention as disclosed and claimed.
, ~ .~
Claims (3)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A composition for cementing wells useful at elevated temperatures containing a hydraulic cement, water and cement retarder is characterized in that in addition to the cement and water it consists essentially of from about 0.3% to about 2% of a partially water-soluble hydroxyethylcellulose having a hydroxyethyl M.S. from about 0.25 to about 1.12, and an intrinsic viscosity in 5% sodium hydroxide at 25°C of from about 6.0 to about 9.0 as the cement retarder.
2. The composition of claim 1 wherein the partially water-soluble hydroxyethylcellulose has a hydroxyethyl M.S. from about 0.5 to about 0.7.
3. The composition of claim 1 wherein the partially water-soluble hydroxyethylcellulose is present in an amount from about 0.4% to about 0.8% by weight based on the hydraulic cement.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US53033883A | 1983-09-08 | 1983-09-08 | |
| US530,338 | 1983-09-08 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1244640A true CA1244640A (en) | 1988-11-15 |
Family
ID=24113295
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000462625A Expired CA1244640A (en) | 1983-09-08 | 1984-09-07 | High temperature well cement composition |
Country Status (2)
| Country | Link |
|---|---|
| CA (1) | CA1244640A (en) |
| GB (1) | GB2146320B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4892589A (en) * | 1987-10-30 | 1990-01-09 | Aqualon Company | Composition comprising water-soluble, nonionic hydrophobically modified hydroxyethyl cellulose and water-soluble, nonionic hydroxyethyl cellulose |
| ATE108190T1 (en) | 1989-01-31 | 1994-07-15 | Union Carbide Chem Plastic | POLYSACCHARIDES WITH ALKARYL OR ARALKYL HYDROPHOBES AND LATEX COMPOSITIONS CONTAINING THE POLYSACCHARIDES. |
| US5504123A (en) * | 1994-12-20 | 1996-04-02 | Union Carbide Chemicals & Plastics Technology Corporation | Dual functional cellulosic additives for latex compositions |
| US6405801B1 (en) * | 2000-12-08 | 2002-06-18 | Halliburton Energy Services, Inc. | Environmentally acceptable well cement fluid loss control additives, compositions and methods |
| CN107721221A (en) * | 2016-08-12 | 2018-02-23 | 中国石油天然气集团公司 | A kind of high temperature resistant phosphate cement and its application |
-
1984
- 1984-09-07 CA CA000462625A patent/CA1244640A/en not_active Expired
- 1984-09-07 GB GB08422719A patent/GB2146320B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| GB2146320B (en) | 1987-01-28 |
| GB2146320A (en) | 1985-04-17 |
| GB8422719D0 (en) | 1984-10-10 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |