USRE33856E - Terpolymer compositions for aqueous drilling fluids - Google Patents

Terpolymer compositions for aqueous drilling fluids Download PDF

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Publication number
USRE33856E
USRE33856E US07/144,260 US14426088A USRE33856E US RE33856 E USRE33856 E US RE33856E US 14426088 A US14426088 A US 14426088A US RE33856 E USRE33856 E US RE33856E
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Prior art keywords
lignin
brown coal
modified
weight
water
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US07/144,260
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David M. Giddings
Charles D. Williamson
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Nalco Exxon Energy Chemicals LP
Ecolab USA Inc
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Nalco Chemical Co
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Priority claimed from US06/848,527 external-priority patent/US4678591A/en
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Priority to US07/144,260 priority Critical patent/USRE33856E/en
Priority to US07/286,887 priority patent/USRE33855E/en
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Assigned to NALCO COMPANY reassignment NALCO COMPANY MERGER (SEE DOCUMENT FOR DETAILS). Assignors: NALCO ENERGY SERVICES, L.P.
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Assigned to BANK OF AMERICA, N.A., AS COLLATERAL AGENT reassignment BANK OF AMERICA, N.A., AS COLLATERAL AGENT SECURITY AGREEMENT Assignors: CALGON LLC, NALCO COMPANY, NALCO CROSSBOW WATER LLC, NALCO ONE SOURCE LLC
Assigned to NALCO COMPANY reassignment NALCO COMPANY RELEASE BY SECURED PARTY (SEE DOCUMENT FOR DETAILS). Assignors: BANK OF AMERICA, N.A.
Assigned to NALCO COMPANY reassignment NALCO COMPANY RELEASE BY SECURED PARTY (SEE DOCUMENT FOR DETAILS). Assignors: BANK OF AMERICA, N.A.
Assigned to NALCO COMPANY LLC reassignment NALCO COMPANY LLC CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: NALCO COMPANY
Assigned to NALCO COMPANY LLC reassignment NALCO COMPANY LLC CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: NALCO COMPANY
Assigned to ECOLAB USA INC. reassignment ECOLAB USA INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: CALGON CORPORATION, CALGON LLC, NALCO COMPANY LLC, ONDEO NALCO ENERGY SERVICES, L.P.
Assigned to NALCO COMPANY reassignment NALCO COMPANY RELEASE BY SECURED PARTY (SEE DOCUMENT FOR DETAILS). Assignors: CITICORP NORTH AMERICA, INC.
Assigned to ECOLAB USA INC. reassignment ECOLAB USA INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: NALCO COMPANY
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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
    • C09K8/60—Compositions for stimulating production by acting on the underground formation
    • C09K8/84—Compositions based on water or polar solvents
    • C09K8/86—Compositions based on water or polar solvents containing organic compounds
    • C09K8/88—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
    • C09K8/90—Compositions based on water or polar solvents containing organic compounds macromolecular compounds of natural origin, e.g. polysaccharides, cellulose
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
    • C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
    • C08F220/52—Amides or imides
    • C08F220/54—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide
    • C08F220/58—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide containing oxygen in addition to the carbonamido oxygen, e.g. N-methylolacrylamide, N-(meth)acryloylmorpholine
    • C08F220/585—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide containing oxygen in addition to the carbonamido oxygen, e.g. N-methylolacrylamide, N-(meth)acryloylmorpholine and containing other heteroatoms, e.g. 2-acrylamido-2-methylpropane sulfonic acid [AMPS]
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F289/00—Macromolecular compounds obtained by polymerising monomers on to macromolecular compounds not provided for in groups C08F251/00 - C08F287/00
    • 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
    • C09K8/18—Clay-containing compositions characterised by the organic compounds
    • C09K8/22—Synthetic organic compounds
    • 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
    • C09K8/18—Clay-containing compositions characterised by the organic compounds
    • C09K8/22—Synthetic organic compounds
    • C09K8/24—Polymers

Definitions

  • Resinex a sulfonated lignite complexed with a sulfonated phenolic resin, is a commercially available high temperature, high pressure fluid loss additive for drilling muds. It is effective in controlling filtration properties in both fresh and sea water muds with high concentrations of soluble calcium.
  • a method for improving high temperature fluid loss and rheology stabilization of high calcium brine clay-containing oil well drilling fluids which comprises adding thereto a stabilizing amount of a water-soluble terpolymer composition comprising: polymer prepared by polymerizing the following monomer ingredients:
  • composition containing lignin, modified lignin, brown coal or modified brown coal in an amount ranging between 5-95% with the lignin, modified lignin, brown coal or modified brown coal having been present during the polymerization of the water-soluble polymer.
  • lignite is a brown coal in which the original structure of the wood is still recognizable. It is commonly known that lignite may be reacted with sulfuric acid or SO 3 to produce a sulfonated lignite.
  • SO 3 sulfuric acid
  • lignin is a byproduct formed in the processing of wood for the manufacture of paper.
  • leonardite is a naturally oxidized product with higher oxygen and moisture content than lignite.
  • humic acid which is a completed polycyclic polycarboxylic acid which can be converted into its salt form e.g. alkali metal, ammonia or amine, or it can be sulfonated.
  • salt form e.g. alkali metal, ammonia or amine
  • sulfonated e.g. sodium bicarbonate
  • Such products as well as other derivatives of humic acid are described in U.S. Pat. No. 3,266,887. The disclosure of which is incorporated herein by reference.
  • the polymer portion of the composition used to practice the invention is prepared in accordance with the teachings of U.S. Pat. No. 4,502,964.
  • the reaction temperature and times may be varied with the reaction time being temperature dependent, e.g. the higher the temperature the shorter the reaction time. Generally, temperatures within the range of about 35°-80° C. may be employed. Although, the temperature and reaction times vary, they are further governed by the amount of catalyst as well as the ratio of the reactants. Often, routine experimentation must be used to optimize the process.
  • compositions are prepared by conducting the polymerization in the presence of the lignin, modified lignin, brown coal or modified brown coal.
  • the amount of brown coal combined with the polymer as indicated ranges between 5-95%, preferably 20-50% and most preferably 20-35% by weight.
  • composition of this invention provides good results at dosages ranging between 0.5-10 lbs. per barrel.
  • a preferred dosage range is between 1-5 lbs. per barrel.
  • the dosages are varied depending upon the conditions and type of formation being treated.
  • the products of the invention provide effective and improved performance as fluid loss additive in oil field drilling fluids. These products show especially improved performance at elevated temperatures.
  • These additives may be used in a wide range of drilling fluid types including the following:

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Dispersion Chemistry (AREA)
  • Emulsifying, Dispersing, Foam-Producing Or Wetting Agents (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

A method of improving high temperature fluid loss and rheology stabilization of high calcium brine clay-containing oil well drilling fluids which comprises adding thereto a stabilizing amount of a water-soluble terpolymer composition comprising:
______________________________________
Ingredients % by weight ______________________________________ NaAMPS 72-3.8 N,N-dimethylacrylamide 13.5-0.7 Acrylonitrile 9.5-0.5 ______________________________________
said composition containing lignin, modified lignin, brown coal or modified brown coal in an amount ranging between 5-95% with the lignin, modified lignin, brown cell or modified brown coal having been present during the polymerization of the water-soluble polymer.

Description

INTRODUCTION
A serious problem is encountered when clay-based oil well drilling fluids are subjected to conditions of high temperature and high pressure in conjunction with utilization of high calcium-containing brines which are used to prepare these drilling fluids. When these conditions exist, conventional drilling fluid polymeric additives such as acrylamide polymers, when used as stabilizers for these fluids, tend to be rendered ineffective.
In U.S. Pat. No. 4,502,964, there is shown an improved high temperature fluid loss additive and rheology stabilizer for high temperature oil well drilling fluids which comprises a water-soluble terpolymer having the following compositions:
______________________________________                                    
                    Mole %                                                
Ingredients           Preferred                                           
                               General                                    
______________________________________                                    
2-acrylamido-2-methylpropane-                                             
                      53.5     51-59                                      
sulfonic acid, sodium salt (AMPS.sup.1)                                   
N,N-dimethylacrylamide                                                    
                      16.6      6-28                                      
acrylonitrile         29.8     20-35                                      
______________________________________                                    
 .sup.1 AMPS, a registered trademark of Lubrizol, Inc.,                   
 2acrylamido-2-methylpropane sulfonic acid, Na salt.
These polymers are further described in this patent as having a molecular weight below one million. They preferably have a molecular weight range within the range of 10,000-500,000. The other properties of these polymers and their efficacy as high temperature fluid loss additives are further described in this patent. The disclosure of U.S. Pat. No. 4,502,964 is incorporated into this disclosure by reference and forms a part hereof.
Resinex, a sulfonated lignite complexed with a sulfonated phenolic resin, is a commercially available high temperature, high pressure fluid loss additive for drilling muds. It is effective in controlling filtration properties in both fresh and sea water muds with high concentrations of soluble calcium.
If it were possible to provide high temperature fluid loss additives having superior activity to the activity of either the polymers described U.S. Pat. No. 4,502,964 or the Resinex additive, an advance in the art would be afforded.
THE INVENTION
In accordance with the invention, there is provided a method for improving high temperature fluid loss and rheology stabilization of high calcium brine clay-containing oil well drilling fluids which comprises adding thereto a stabilizing amount of a water-soluble terpolymer composition comprising: polymer prepared by polymerizing the following monomer ingredients:
______________________________________                                    
Ingredients       % by weight                                             
______________________________________                                    
NaAMPS             72-3.8                                                 
N,N-dimethylacrylamide                                                    
                  13.5-0.7                                                
Acrylonitrile     9.5-0.5                                                 
______________________________________
said composition containing lignin, modified lignin, brown coal or modified brown coal in an amount ranging between 5-95% with the lignin, modified lignin, brown coal or modified brown coal having been present during the polymerization of the water-soluble polymer.
THE LIGNIN, MODIFIED LIGNIN, BROWN COAL OR MODIFIED BROWN COAL
A variety of material falling within this generic description may be used in the practice of the invention. One of the most common materials is lignite which is a brown coal in which the original structure of the wood is still recognizable. It is commonly known that lignite may be reacted with sulfuric acid or SO3 to produce a sulfonated lignite. A related product that may also be substituted is lignin which is a byproduct formed in the processing of wood for the manufacture of paper.
It can be modified to provide a lignosulfonate or a cyano derivative as described in U.S. Pat. No. 3,639,263.
Another related product is leonardite which is a naturally oxidized product with higher oxygen and moisture content than lignite.
Another brown coal-type material is humic acid which is a completed polycyclic polycarboxylic acid which can be converted into its salt form e.g. alkali metal, ammonia or amine, or it can be sulfonated. Such products as well as other derivatives of humic acid are described in U.S. Pat. No. 3,266,887. The disclosure of which is incorporated herein by reference.
The polymer portion of the composition used to practice the invention is prepared in accordance with the teachings of U.S. Pat. No. 4,502,964. The reaction temperature and times may be varied with the reaction time being temperature dependent, e.g. the higher the temperature the shorter the reaction time. Generally, temperatures within the range of about 35°-80° C. may be employed. Although, the temperature and reaction times vary, they are further governed by the amount of catalyst as well as the ratio of the reactants. Often, routine experimentation must be used to optimize the process.
As indicated, the compositions are prepared by conducting the polymerization in the presence of the lignin, modified lignin, brown coal or modified brown coal.
The amount of brown coal combined with the polymer as indicated ranges between 5-95%, preferably 20-50% and most preferably 20-35% by weight.
One of the suprising facts of the invention is that the entire broad range of lignin, modified lignin, brown coal or modified brown coal used shows excellent results are achieved in providing fluid loss control.
The composition of this invention provides good results at dosages ranging between 0.5-10 lbs. per barrel. A preferred dosage range is between 1-5 lbs. per barrel. The dosages are varied depending upon the conditions and type of formation being treated.
______________________________________                                    
Method for Preparing the Compositions of the Invention                    
Composition I                                                             
       Component     Weight Percent                                       
______________________________________                                    
(1)      Deionized Water 55.77                                            
(2)      Causticized Lignite                                              
                         9.53                                             
(3)      50% Na AMPS Solution                                             
                         28.87                                            
(4)      Dimethylacrylamide                                               
                         2.71                                             
(5)      Acrylonitrile   1.90                                             
(6)      EDTA            .10                                              
(7)      Sodium Bisulfite                                                 
                         .56                                              
(8)      Ammonium Persulfate                                              
                         .56                                              
                         100.00                                           
______________________________________
Charge (1) and (2) to reactor with stirring, heat to 60° C. and continue stirring at 60° C. for 30 minutes. Charge (3)-(6). Close in reactor, pull vacuum, break with nitrogen, repeat. Charge catalyst pair (7) and (8), portion-wise (approximately 0.14 weight percent) at one hour intervals. A small exotherm (10°-15° C.) may occur and the solution should gain viscosity. It appears that a Brookfield viscosity greater than 200 centipoise is necessary for peak product performance. Continue adding catalyst doses until residual monomer levels are at acceptable levels (less than 1% for AMPS and dimethylacrylamide, and less than 25 ppm for acrylonitrile). Typical residuals for open pot laboratory reactions are as follows:
______________________________________                                    
Monomer               Residual                                            
______________________________________                                    
ACN                    1.7 ug/g                                           
AMPS                   .07%                                               
diMeAcAM              <.05%                                               
______________________________________
Using this general preparative method, the following compositions in Table I were prepared:
              TABLE I                                                     
______________________________________                                    
Product Compositions                                                      
Weight Percents                                                           
Composition        N,N-dimethyl-        Lig-                              
No.      NaAMPS    acrylamide  Acrylonitrile                              
                                        nite                              
______________________________________                                    
1        50.5      9.5         6.7      33.3                              
2        60.7      11.4        7.9      20                                
3        72.0      13.5        9.5      5                                 
4        3.8       0.7         0.5      95                                
5        54.3      12.4        --       33.3                              
6        47.2      18.4        1.1      33.3                              
7        48.6      14.7        3.4      33.3                              
8        51.6      6.7         8.4      33.3                              
9        56.9      2.1         7.7      33.3                              
10       59.3      --          7.4      33.3                              
11       66.7      --          --       33.3                              
______________________________________
The following variations contain the same base polymer with different lignin/lignite variations:
NaAMPS (50.5%), N,N-dimethylacrylamide (9.5%), acrylonitrile (6.5%), lignin/lignite variation (33.3%).
______________________________________                                    
Composition No.   Lignin/Lignite Variation                                
______________________________________                                    
12                Ca lignosulfonate                                       
13                Na lignosulfonate                                       
14                Lignin                                                  
15                Sulfomethylated lignite                                 
16                Sulfonated lignite                                      
______________________________________
FLUID TEST PROCEDURES
The variations were tested in a high temperature, high pressure fluid loss additive test which is described in detail in the American Petroleum Institute publication RP13(B). Improved fluid loss control was observed for the variations tested. The results in both unaged muds and muds aged overnight at 350° F. are shown in Table II. The base mud used for testing consisted of:
______________________________________                                    
280       g          water                                                
15        g          bentonite                                            
40        g          kaolinite                                            
4         g          chrome lignosulfonate                                
294       g          barite                                               
10.6      g.         sea salt                                             
______________________________________
Using the above test procedures, the compositions of Table I were evaluated with the results being shown in Table II.
              TABLE II                                                    
______________________________________                                    
Composi-                                                                  
       Concentration                                                      
                    HTHP Fluid Loss (ml)                                  
tion No.                                                                  
       (lbs/bbl)    Unaged        Aged 350° F.                     
______________________________________                                    
Blank  --           dry @ 27 min  dry @ 28 min                            
1      2            80            70                                      
2      2            64            62                                      
3      2            76            66                                      
4      2            142           134                                     
5      2            90            70                                      
6      2            78            60                                      
7      2            74            62                                      
8      2            96            66                                      
9      2            98            94                                      
10     2            112           94                                      
11     2            84            70                                      
12     2            dry @ 29 min 30 sec                                   
                                  82                                      
13     2            134           102                                     
14     2            dry @ 27 min  96                                      
15     2            dry @ 29 min 30 sec                                   
                                  124                                     
16     2            124           96                                      
______________________________________
The products of the invention, either in solution or in dry form, provide effective and improved performance as fluid loss additive in oil field drilling fluids. These products show especially improved performance at elevated temperatures. These additives may be used in a wide range of drilling fluid types including the following:
(1) fresh water muds
(2) fresh water muds contaminated with calcium or other multivalent ion
(3) sea water muds
(4) gypsum muds
(5) lime muds

Claims (2)

Having thus described our invention it is claimed as follows:
1. A method of improving high temperature fluid loss and rheology stabilization of high calcium brine clay-containing aqueous oil well drilling fluids which comprises adding thereto a stabilizing amount of a water-soluble terpolymer composition comprising: a polymer prepared by polymerizing the following monomer ingredients:
______________________________________                                    
Ingredients          % by Weight                                          
______________________________________                                    
[NaAMPS] 2-acrylamido-2-methyl-                                           
                      72-3.8                                              
propane sulfonic acid, sodium salt                                        
N,N-dimethylacrylamide                                                    
                     13.5-0.7                                             
Acrylonitrile        9.5-0.5                                              
______________________________________
said composition containing lignin, modified lignin, brown coal or modified brown coal in an amount ranging between 5-95% with the .Iadd.lignin, modified lignin, .Iaddend.brown coal or modified brown coal having been present during the polymerization of the water-soluble polymer, where the lignin, modified lignin, brown coal or modified brown coal is from the group consisting of lignites, sulphonated lignites, lignins, leonardites, lignosulfonates, alkali metal humic acid salts, humic acids, and sulphonated humic acids. .[.2. The method of claim 1 where the lignin, modified lignin, brown coal or modified brown coal is present in an amount
ranging between 5-95% by weight..]. 3. The method of claim 1 where the lignin, modified lignin, brown coal or modified brown coal is present in an amount ranging between 20-35% by weight.
US07/144,260 1986-04-07 1988-01-15 Terpolymer compositions for aqueous drilling fluids Expired - Lifetime USRE33856E (en)

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US07/286,887 USRE33855E (en) 1986-04-07 1988-12-20 Terpolymer composition for aqueous drilling fluids

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US06/848,527 US4678591A (en) 1986-04-07 1986-04-07 Terpolymer composition for aqueous drilling fluids
US07/144,260 USRE33856E (en) 1986-04-07 1988-01-15 Terpolymer compositions for aqueous drilling fluids

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060111245A1 (en) * 2004-11-23 2006-05-25 Carbajal David L Environmentally friendly water based mud deflocculant/ thinner
CN103710011A (en) * 2013-12-16 2014-04-09 吉林省东新石油工程技术有限公司 Modified polyacrylamide profile control system as well as preparation and use method thereof
CN111690385A (en) * 2020-06-30 2020-09-22 乌海市盛世源石油科技有限公司 Filtrate reducer lignite resin for drilling fluid and preparation method thereof

Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2650197A (en) * 1953-04-21 1953-08-25 Henry W Rahn Well drilling composition and method of manufacture thereof
US2718497A (en) * 1950-11-03 1955-09-20 Union Oil Co Drilling muds
US2935504A (en) * 1955-10-10 1960-05-03 Puget Sound Pulp And Timber Co Process of improving the effectiveness of the components of spent sulfite liquor andthe products thereof
US3266887A (en) * 1962-10-29 1966-08-16 Nalco Chemical Co Ore pelletization process and products
US3639263A (en) * 1968-07-31 1972-02-01 Nalco Chemical Co Corrosion inhibition with a tannin, cyanohydrinated lignosulfonate, and an inorganic metal salt composition
US3700728A (en) * 1968-01-04 1972-10-24 Canadian Patents Dev Solubilization of humic acids, lignites and coals
US3985659A (en) * 1975-02-24 1976-10-12 Georgia-Pacific Corporation Drilling fluid composition
US4374738A (en) * 1980-06-09 1983-02-22 Georgia-Pacific Corporation Drilling fluid composition
EP0072445A2 (en) * 1981-07-27 1983-02-23 B W Mud Limited Temperature stable drilling fluids
US4502964A (en) * 1983-09-09 1985-03-05 Nalco Chemical Company Terpolymers for use as high temperature fluid loss additive and rheology stabilizer for high pressure, high temperature oil well drilling fluids
US4547299A (en) * 1984-03-15 1985-10-15 Milchem Incorporated Drilling fluid containing a copolymer filtration control agent
US4650593A (en) * 1977-09-19 1987-03-17 Nl Industries, Inc. Water-based drilling fluids having enhanced fluid loss control
US4676317A (en) * 1986-05-13 1987-06-30 Halliburton Company Method of reducing fluid loss in cement compositions which may contain substantial salt concentrations

Patent Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2718497A (en) * 1950-11-03 1955-09-20 Union Oil Co Drilling muds
US2650197A (en) * 1953-04-21 1953-08-25 Henry W Rahn Well drilling composition and method of manufacture thereof
US2935504A (en) * 1955-10-10 1960-05-03 Puget Sound Pulp And Timber Co Process of improving the effectiveness of the components of spent sulfite liquor andthe products thereof
US3266887A (en) * 1962-10-29 1966-08-16 Nalco Chemical Co Ore pelletization process and products
US3700728A (en) * 1968-01-04 1972-10-24 Canadian Patents Dev Solubilization of humic acids, lignites and coals
US3639263A (en) * 1968-07-31 1972-02-01 Nalco Chemical Co Corrosion inhibition with a tannin, cyanohydrinated lignosulfonate, and an inorganic metal salt composition
US3985659A (en) * 1975-02-24 1976-10-12 Georgia-Pacific Corporation Drilling fluid composition
US4650593A (en) * 1977-09-19 1987-03-17 Nl Industries, Inc. Water-based drilling fluids having enhanced fluid loss control
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CN103710011B (en) * 2013-12-16 2017-05-10 安东石油技术（集团）有限公司 Modified polyacrylamide profile control system as well as preparation and use method thereof
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