Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.

Patents

  1. Advanced Patent Search
Publication numberUSRE33856 E
Publication typeGrant
Application numberUS 07/144,260
Publication dateMar 24, 1992
Filing dateJan 15, 1988
Priority dateApr 7, 1986
Publication number07144260, 144260, US RE33856 E, US RE33856E, US-E-RE33856, USRE33856 E, USRE33856E
InventorsDavid M. Giddings, Charles D. Williamson
Original AssigneeNalco Chemical Company
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Acrylonitrile, dimethylacrylamide and a sodium salt of 2-acrylamido-2-methylpropanesulfonic acid
US RE33856 E
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 72-3.8N,N-dimethylacrylamide 13.5-0.7Acrylonitrile 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.
Images(5)
Previous page
Next page
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-                 72-3.8propane sulfonic acid, sodium saltN,N-dimethylacrylamide                13.5-0.7Acrylonitrile        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.
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     51-59sulfonic acid, sodium salt (AMPS1)N,N-dimethylacrylamide                 16.6      6-28acrylonitrile         29.8     20-35______________________________________ 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             72-3.8N,N-dimethylacrylamide             13.5-0.7Acrylonitrile     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 InventionComposition 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/gAMPS                   .07%diMeAcAM              <.05%______________________________________

Using this general preparative method, the following compositions in Table I were prepared:

              TABLE I______________________________________Product CompositionsWeight PercentsComposition        N,N-dimethyl-        Lig-No.      NaAMPS    acrylamide  Acrylonitrile                                   nite______________________________________1        50.5      9.5         6.7      33.32        60.7      11.4        7.9      203        72.0      13.5        9.5      54        3.8       0.7         0.5      955        54.3      12.4        --       33.36        47.2      18.4        1.1      33.37        48.6      14.7        3.4      33.38        51.6      6.7         8.4      33.39        56.9      2.1         7.7      33.310       59.3      --          7.4      33.311       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 lignosulfonate13                Na lignosulfonate14                Lignin15                Sulfomethylated lignite16                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          water15        g          bentonite40        g          kaolinite4         g          chrome lignosulfonate294       g          barite10.6      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 min1      2            80            702      2            64            623      2            76            664      2            142           1345      2            90            706      2            78            607      2            74            628      2            96            669      2            98            9410     2            112           9411     2            84            7012     2            dry @ 29 min 30 sec                             8213     2            134           10214     2            dry @ 27 min  9615     2            dry @ 29 min 30 sec                             12416     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

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2650197 *Apr 21, 1953Aug 25, 1953Rahn Henry WWell drilling composition and method of manufacture thereof
US2718497 *Nov 3, 1950Sep 20, 1955Union Oil CoDrilling muds
US2935504 *Oct 10, 1955May 3, 1960Puget Sound Pulp And Timber CoProcess of improving the effectiveness of the components of spent sulfite liquor andthe products thereof
US3266887 *Oct 29, 1962Aug 16, 1966Nalco Chemical CoOre pelletization process and products
US3639263 *Jul 31, 1968Feb 1, 1972Nalco Chemical CoCorrosion inhibition with a tannin, cyanohydrinated lignosulfonate, and an inorganic metal salt composition
US3700728 *Dec 30, 1968Oct 24, 1972Canadian Patents DevSolubilization of humic acids, lignites and coals
US3985659 *Feb 24, 1975Oct 12, 1976Georgia-Pacific CorporationBentonite or subbentonite and a lignosulfonate polyacrylate copolymer
US4374738 *Sep 21, 1981Feb 22, 1983Georgia-Pacific CorporationDrilling fluid composition
US4502964 *Sep 9, 1983Mar 5, 1985Nalco Chemical CompanyTerpolymers for use as high temperature fluid loss additive and rheology stabilizer for high pressure, high temperature oil well drilling fluids
US4547299 *Mar 15, 1984Oct 15, 1985Milchem IncorporatedDrilling fluid containing a copolymer filtration control agent
US4650593 *Sep 19, 1977Mar 17, 1987Nl Industries, Inc.Water-based drilling fluids having enhanced fluid loss control
US4676317 *May 13, 1986Jun 30, 1987Halliburton CompanyMethod of reducing fluid loss in cement compositions which may contain substantial salt concentrations
EP0072445A2 *Jul 17, 1982Feb 23, 1983B W Mud LimitedTemperature stable drilling fluids
Non-Patent Citations
Reference
1 *Amer. Petroleum Institute, publication RP 13 (B), 6th Ed., Apr. 1976, pp. 1 33, Standard Procedure for Testing Drilling Fluids .
2Amer. Petroleum Institute, publication RP 13 (B), 6th Ed., Apr. 1976, pp. 1-33, "Standard Procedure for Testing Drilling Fluids".
Classifications
U.S. Classification507/106, 507/121, 507/120, 507/107, 507/108
International ClassificationC09K8/22, C09K8/90, C08F220/58, C09K8/24, C08F289/00
Cooperative ClassificationC09K8/90, C08F220/58, C09K8/24, C08F289/00, C09K8/22
European ClassificationC09K8/90, C08F289/00, C09K8/24, C08F220/58, C09K8/22
Legal Events
DateCodeEventDescription
May 18, 2009ASAssignment
Owner name: BANK OF AMERICA, N.A., AS COLLATERAL AGENT, NEW YO
Free format text: SECURITY AGREEMENT;ASSIGNORS:NALCO COMPANY;CALGON LLC;NALCO ONE SOURCE LLC;AND OTHERS;REEL/FRAME:022703/0001
Effective date: 20090513
Feb 15, 2006ASAssignment
Owner name: NALCO COMPANY, ILLINOIS
Free format text: MERGER;ASSIGNOR:NALCO ENERGY SERVICES, L.P.;REEL/FRAME:017164/0856
Effective date: 20060101
Feb 9, 2006ASAssignment
Owner name: NALCO ENERGY SERVICES, L.P., TEXAS
Free format text: CHANGE OF NAME;ASSIGNOR:ONDEO NALCO ENERGY SERVICES, L.P.;REEL/FRAME:017145/0498
Effective date: 20031107
Dec 8, 2003ASAssignment
Owner name: CITICORP NORTH AMERICA, INC. AS ADMINISTRATIVE AGE
Free format text: GRANT OF SECURITY INTEREST;ASSIGNOR:ONDEO NALCO ENERGY SERVICES, L.P.;REEL/FRAME:014797/0293
Effective date: 20031104
Free format text: GRANT OF SECURITY INTEREST;ASSIGNOR:ONDEO NALCO ENERGY SERVICES, L.P. /AR;REEL/FRAME:014797/0293
Mar 7, 1996ASAssignment
Owner name: NALCO/ EXXON ENERGY CHEMICALS, L.P., TEXAS
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:NALCO CHEMICAL COMPANY;REEL/FRAME:007846/0309
Effective date: 19940901