USRE45950E1 - Application of degradable polymers in sand control - Google Patents
Application of degradable polymers in sand control Download PDFInfo
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- USRE45950E1 USRE45950E1 US14/491,668 US201414491668A USRE45950E US RE45950 E1 USRE45950 E1 US RE45950E1 US 201414491668 A US201414491668 A US 201414491668A US RE45950 E USRE45950 E US RE45950E
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- screen
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Images
Classifications
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- 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
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
- C08G63/02—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds
- C08G63/06—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds derived from hydroxycarboxylic acids
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
- C08G63/02—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds
- C08G63/06—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds derived from hydroxycarboxylic acids
- C08G63/08—Lactones or lactides
-
- 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
- C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
- C09K8/504—Compositions based on water or polar solvents
- C09K8/506—Compositions based on water or polar solvents containing organic compounds
- C09K8/508—Compositions based on water or polar solvents containing organic compounds macromolecular 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
- C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
- C09K8/504—Compositions based on water or polar solvents
- C09K8/506—Compositions based on water or polar solvents containing organic compounds
- C09K8/508—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
- C09K8/512—Compositions based on water or polar solvents containing organic compounds macromolecular compounds containing cross-linking agents
-
- 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
- C09K8/62—Compositions for forming crevices or fractures
- C09K8/66—Compositions based on water or polar solvents
- C09K8/68—Compositions based on water or polar solvents containing 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
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/62—Compositions for forming crevices or fractures
- C09K8/66—Compositions based on water or polar solvents
- C09K8/68—Compositions based on water or polar solvents containing organic compounds
- C09K8/685—Compositions based on water or polar solvents containing organic compounds containing cross-linking agents
-
- 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
- C09K8/887—Compositions based on water or polar solvents containing organic compounds macromolecular compounds containing cross-linking agents
-
- 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
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/24—Bacteria or enzyme containing gel breakers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y10S507/903—Crosslinked resin or polymer
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y10S507/00—Earth boring, well treating, and oil field chemistry
- Y10S507/922—Fracture fluid
- Y10S507/923—Fracture acidizing
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S507/00—Earth boring, well treating, and oil field chemistry
- Y10S507/925—Completion or workover fluid
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S507/00—Earth boring, well treating, and oil field chemistry
- Y10S507/926—Packer fluid
Definitions
- This invention pertains to mechanical and chemical operations in wells.
- polymer and method of preparing viscous fluid for use in wells is provided.
- material and methods are provided for coating of sand control screens used in wellbores.
- this invention pertains to delayed mechanical or flow changes in a wellbore after equipment is placed in the well.
- this invention pertains to equipment that is placed in a wellbore and is degraded in the wellbore by contact with aqueous fluid.
- a large number of mechanical and chemical operations are carried out in and around wells.
- Most of these wells are used for producing hydrocarbons from the earth. They are located at depths ranging from a few hundred feet below the surface of the earth to more than 30,000 feet.
- the temperature at the bottom of the wells likewise varies over a wide range—from about 100° F. to more than 400° F.
- the process of placing casing in the well and cementing it in place is commenced.
- Mechanical devices to aid in the cementing process may be placed on the outside of the casing before it is placed in the hole.
- Instruments and communication cables may be placed on the casing.
- Multiple lateral holes may be drilled from a single hole and casing may be placed in each.
- the process of “completing” the well may begin. This involves forming holes (“perforating”) the casing opposite an interval of a formation where fluids are to be produced or injected and, in most cases, placing tubing in the well.
- Various types of mechanical equipment may be placed in the wellbore, for safety, flow control and other purposes.
- viscous fluids may be used. In most cases, it is desirable that the fluid become lower viscosity with time after it is placed in a well or formation around a well. When the fluid becomes low viscosity it should contain no significant amount of solid or gel material.
- One example application of such fluids is hydraulic fracturing of wells.
- U.S. Patent Application Publication 2003/0060374A1 which is hereby incorporated by reference herein, discloses the use of highly concentrated degradable polymers in an aqueous liquid in such application. As explained in that Publication, there is a need for fracturing fluids that degrade to low viscosity without leaving a residue.
- a viscous fluid may be injected into a well or used in a well.
- completion fluid performing fluids and fluids for carrying gravel (sand) into a well.
- These fluids are preferably solids-free and degradable to low viscosity fluid having low solid or gel content that could degrade permeability of a porous rock.
- Other applications where a viscous liquid in a wellbore may be advantageous include a completion or workover fluid that is placed in a well during running of a mechanical device into the well or other mechanical operation in the well.
- These fluids may contain high concentrations of compounds soluble in water that increase the density of the fluid, such as sodium bromide or zinc bromide, or solid weighting materials. The viscosifying material in the fluids should degrade with time and leave little or no residue of solid or gel that could damage the permeability of a formation around the well.
- a wide variety of mechanical devices are placed in wells during completion and workover operations. These devices are used to control fluid flow, to seal around tubulars in the well, to perform measurements of physical or chemical parameters and various other purposes. These devices may be needed for only a limited time and then an operator may wish to have them no longer effective or to no longer have mechanical strength. For example, packers, bridge plugs and cement retainers may be needed for a limited time in a well. There may be a need to release a mechanical device or open a port after a selected time in an inaccessible portion of a wellbore, such as in an annulus between tubular strings, where an aqueous fluid is located.
- Degradable polymers and methods for using in wells are provided.
- the degradable polymer is used to viscosify fluids used in wellbore operations.
- the degradable polymer is used to protect a sand control screen from plugging as it is placed in a well.
- the degradable polymer is used to delay to a selected range of time a change in mechanical or flow conditions in a well.
- the solid degradable polymer is used to form equipment that is temporarily used in well operations.
- FIG. 1 shows a sketch of a cased well having tubing and the surrounding formation.
- FIG. 2 shows a cross-section of a wire-wrapped sand control screen protected by a degradable polymer.
- FIG. 3 shows spring-loaded apparatus in the annulus between tubing and casing in a well that is released by degradation of a degradable polymer.
- wellbore 10 penetrates formation 20 where fluid is to be produced or injected.
- Wellbore 10 has casing 12 extending through formation 20 , casing 12 being cemented in place by cement sheath 17 .
- Perforations 14 have been formed through the wall of casing 12 and cement sheath 17 into formation 20 .
- Perforations 14 may extend over the entire thickness of formation 20 or may extend only over a selected interval of formation 20 less than the total thickness surrounding wellbore 10 .
- hydraulic fracture 30 may have been formed around wellbore 10 by a previous treatment employing conventional fracturing fluid and proppant, using techniques well-known in industry. Alternatively, fracture 30 may not be present.
- Tubing 16 may have been suspended inside casing 12 and packer 18 may have been set near the bottom of tubing 16 to seal the annulus between tubing 16 and casing 12 .
- Packer 18 may not be present in some wells, tubing 16 may not be present in some wells, and even casing 12 may not be present in some wells, although most wells in which the methods disclosed here will be applied contain casing and tubing with a packer near the bottom of the tubing.
- Packer 18 may have a controllable port for circulating fluids in the annulus of the well (not shown) or tubing 16 may be releasable from packer 18 to allow circulation of fluids down the tubing and up the tubing-casing annulus.
- tubing 16 may contain a sliding sleeve above and near packer 18 , which is well known in industry.
- the materials and methods disclosed in U.S. Patent Application Publication 2003/0060374A1 may be used to form short hydraulic fracture 32 around wellbore 10 by injecting the degradable fracturing fluid at a pressure above the fracturing pressure of formation 20 .
- the fracturing fluid disclosed herein is similar to fracturing fluids normally used, in which a polymer is dispersed in a liquid to increase viscosity of the liquid, and has rheological properties similar to the conventional fracturing fluids.
- the fracturing fluid disclosed herein is a more dilute mixture of the degradable polymer contained in the “polymer phase” disclosed in the cited '374 Publication, and it may be used to form hydraulic fracture 30 or hydraulic fracture 32 , as shown in FIG. 1 .
- the preferred degradable polymer is a polymer that is polymerized to a preferred range of molecular weight or is degraded (decreased in molecular weight) by reaction with water (herein “water-degradable”) to desirable range of molecular weight for use in a wellbore fluid.
- the polymer is dispersed or dissolved in an aqueous liquid and then degrades to mostly water-soluble monomers or oligomers over a period of time in the presence of water.
- PLA polylactic acid
- other degradable polymers including other polyesters (based on polyethylene terephthalate, for example), starches, polycaprolactone, polyhydroxybutyrates and blends of these materials have been developed.
- Properties of lactide polymers are reviewed in the article “Properties of lactic acid based polymers and their correlation with composition,” A. Sodergard and M. Stolt, Prog. in Pol. Sci., July, 2002. Further development is underway for other degradable or biodegradable polymers. Metabolix, Inc.
- PHAs polyhydroxyalkanoates
- PHA polymers also polyesters
- the properties of such polymers can be adjusted by molecular weight distribution, crystallinity, co-polymers and additives to control physical properties and degradation time under selected environments.
- Polymers such as PLAs and selected PHAs, such as polyhydroxybutyrate can be optimized for the applications disclosed herein by varying manufacturing methods and conditions. Polyhydroxybutyrate will be, in general, more stable to degradation than PLA. Different polymerization variables can be controlled during manufacture and/or compounding to provide desirable degradation times under a broad range of environmental conditions that exist in underground formations.
- the PHAs can also be optimized by varying microbes used in the fermentation processes.
- Degradation of solid polyesters occurs first by water penetrating the bulk of the polymer, preferentially attacking the chemical bonds in the amorphous polymer and converting long chains into shorter water-soluble fragments.
- Degradation rates can be controlled by incorporation of various additives.
- the control of properties of thermoplastic polymers by addition of plasticizers and other additives is well known. Of course, exposure of the plastics to moisture before their use can be controlled to prevent premature degradation.
- Biodegradable polymers may also be degraded by enzymes, which may be used to contact the polymers, as is known in the art.
- heating of the polymers in the wellbore can be used to increase degradation rate of the polymer may be contacted by a solution containing enzymes.
- the Sodergard and Stolt article, cited above, discusses biodegradation of degradable polymers, including polyesters, and polylactic acid in particular.
- the degradation rate (hydrolysis) of polylactic acids may be increased significantly by enzymes pronase, proteinase K and bromelain.
- Rate of polymer degradation will depend primarily on polymer composition, polymer structure and temperature.
- degradation time can be determined by heating a sample of the polymer to be injected. A water-degradable polymer can be exposed to an aqueous liquid and subjected to a thermal history simulating the conditions the polymer would experience in a well where it is to be used.
- the thermal history of the polymer as it is placed in a wellbore or injected down a wellbore and resides in the wellbore or the subsurface formation while degrading may be simulated in laboratory tests to select the polymer or copolymers and any additives used with the polymer.
- a fracturing fluid, completion or workover wellbore fluid, fluid for carrying gravel into a fracpack or gravel pack or fluid for other well operations may be formed by polymerizing lactic acid to PLA or forming PHA or other biopolymer having a range of molecular weight that can be dissolved in an aqueous liquid to be used in the well operation and adding the resulting polymer to aqueous liquid. If the molecular weight of the manufactured PLA or PHA is too high to allow solubility in the aqueous liquid, the molecular weight of the polymer can be decreased by applying heat to the polymer in the presence of water.
- steam or hot water may be applied to solid or liquid polymer for a selected time to obtain a molecular weight range of the polymer such that it can be dissolved in the aqueous liquid to be used in a well operation.
- Polymer having a desired range of molecular weight may be stabilized or partially stabilized against further decrease of molecular weight until it is used in a well operation by removing water from the polymer (drying) or by lowering the temperature of the polymer in an aqueous fluid.
- the well treatment fluid disclosed herein may be placed in wellbore 10 ( FIG. 1 ) by pumping the viscous polymer down the well from the surface as fluids of the prior art are pumped.
- the polymer is added to the aqueous well treatment fluid to a concentration selected to achieve the desired range of viscosity of the treatment fluid.
- the polymer may be cross-linked to increase the effective viscosity of the solution using well known cross-linking agents.
- polylactide The properties of polylactide are affected by the isomeric content of the polymer.
- D,L-polylactide disclosed in U.S. Pat. No. 4,716,964, discussed above, which is a racemic mixture
- a polylactide formed from 13 percent D-isomer and 87 percent L-isomer, available from Cargill-Dow is primarily amorphous in the solid state and degrades to form a viscous liquid in the presence of water.
- a polymer that is amorphous or not highly crystalline in the solid state will be used to form the well treatment fluid of this invention.
- the relative amount of D- and L-isomer should be selected in the range from about 10 percent to about 90 percent of an isomer or in a range to form an amorphous or not highly crystalline polymer. It is believed that isomer compositions in this range form an amorphous polymer and the lower molecular weight polymers and the oligomers formed during degradation form less crystalline material, allowing formation of the viscous liquid during degradation of the polymer.
- the viscous liquid can be diluted to form a solution having desired rheological properties. Amorphous forms of other polyesters are preferred for the same reasons.
- the polymers may be applied in the solid form in a variety of processes or methods.
- the primary characteristic of the polymer in some of these applications is that the mechanical properties of the polymer change in a predictable manner with time in the presence of water or an aqueous liquid. If desired, an initial solid polymer may finally go in solution in the aqueous phase.
- only a decrease in mechanical properties (modulus, bending strength, tensile or compressive strength, for example) in a predictable time range may be necessary for application of the polymer.
- the polymer may maintain its mechanical properties until it is employed, then decrease in mechanical properties and become a low-strength gel or low-strength crystalline solid or become soluble in an aqueous phase in a wellbore.
- degradable polymer is used to coat a sand control screen or slotted liner before it is placed in a well.
- a sand control screen or slotted liner Such an application is described in a recently published U.S. Patent Application (No. 2002/0142919A1), which is hereby incorporated by reference.
- the material used to coat the screen is called a “binder.”
- the binder may contain components that “react with potentially plugging materials in the near wellbore area” when the components are released as the binder melts or dissolves.
- Such components are well known (scale, paraffin and clays, for example).
- the use of wax and soluble solids as a binder is disclosed.
- the use of a water-degradable solid polymer that decreases in molecular weight with time is not disclosed.
- FIG. 2 shows a cross-section of a wire-wrapped sand control screen.
- the screen includes basepipe 130 , stand-offs 134 and wire 136 .
- Washpipe or tail pipe 132 is shown inside the screen.
- the protective coating on the screen is designated 122 . It should be understood that a screen is illustrated, but a perforated liner or permeable sintered medium may be protected by a protective coating such as coating 122 .
- the use of PLA, PHA and other polyester polymers makes possible a timed degradation of the coating, rather than the employment of temperature alone or dissolution in a fluid as disclosed in the '919 Publication.
- the properties of the polyester may be selected to maintain sufficient mechanical strength to prevent displacement of the polymer from the screen as it is placed in a well. This time may be from several hours to days, depending on the time required to place the coated screen in a well.
- An example of the decrease in molecular weight of poly (DL-lactide) with time is provided in the paper “Further investigations on the hydrolytic degradation of poly (DL-lactide),” Biomaterials 20 (1999) 35-44. The data in the paper were obtained at 37° C. and at 60° C. As can be noted in the U.S.
- the rate of degradation is much more rapid at temperatures more typical of the temperature in wells.
- the polymer coating initially should have a melting point higher than the temperature expected in the well.
- the polymer should degrade to form a material that can be displaced from the well. If the polymer should flow outwardly from the screen, the polymer should not permanently damage permeability of the gravel placed in the well. Some or the entire polymer may be produced from the well as a viscous liquid.
- the initial strength of the solid polymer should be sufficient to prevent flow across the screen, in the area where the polymer is applied, under pressure differentials across the screen as it is placed in the well.
- the polymer coating may be used, for example, to prevent flow through only selected areas of the screen as it is put in a well.
- a composite may be formed with the polymer by incorporating particles of a rigid solid, which may be a soluble crystalline material, for example, in the polymer before it is place on the screen.
- Polymers having varying degradation rates may be used on different areas of a screen. For example, a more rapidly degrading polymer may be used over the lower portion of a screen.
- Degradable polymer such as PLA
- the screen may be heated before application of the polymer to allow more uniform flow of polymer into the screen.
- the polymer may be applied from solution in a solvent and the solvent removed to form a solid polymer.
- the base pipe or mandrel of the screen may be coated and the holes plugged with hot PLA or other water-degradable polymer before the wire of a screen is applied.
- blank pipe to be run into a well may be coated with the degradable polymer.
- the degradable polymer may be formulated to contain any or all the additives taught by the '919 Publication. The additives would then be release to enter the fluids around the screen or blank pipe as the polymer degrades.
- the devices may be used to measure physical or chemical variables or to modify flow conditions in the well, for example.
- a change in the position, status or operation of the device after a selected time may be desirable.
- a degradable polymer such as PLA or a PHA, may be used to form a mechanical part of the device or a support for the device.
- the degradation rate of the degradable polymer may be selected to allow the desired change to occur in a selected range of time after placement of the device in a well.
- FIG. 3 is adapted from U.S. Pat. No. 5,509,474.
- tubing 106 has been placed in a well inside casing 12 .
- Sensors 111 are designed to be released from the vicinity of the outside surface of tubing 106 and then to spring against the inside wall of casing 12 .
- An electromechanical device could be used to release the spring-loaded sensors.
- groove 200 may be formed in insulating material collar 114 and the spring-loaded sensors may be held in groove 200 by placing a selected solid water-degradable polymer over the sensor, shown at 111 (a), in the groove, using techniques of placement such as described above for a screen.
- polymer in groove 200 degrades to a range of mechanical properties (determined by the decrease in molecular weight of the degradable polymer) that allows sensor 111 to be released and to spring into the position shown at 111 , which is in contact with the inside surface of casing 12 .
- mechanical devices or selected parts of mechanical devices that are placed in a well may be formed from solid degradable polymer such as PLA or PHA.
- parts of a packer, a bridge plug or a cement retainer may be formed of water-degradable polymer.
- the device or selected parts of the device may be designed to decrease in properties so as to release the device and facilitate retrieval.
- the entire device may be formed of a degradable polymer where strength of the polymer is adequate.
- a nipple or pipe section may be formed of degradable polymer. The nipple or pipe may degrade and later be produced from a well.
- the pipe may be the “tail pipe” used in a sand control screen, for example.
- the PLA used in fluids is preferably amorphous, as described above, the PLA used in mechanical or flow control devices may be amorphous or crystalline.
- the bending strength of rods of poly (D-lactide) (PLA) (which would be crystalline) when made by routine injection molding has been measured to be in the range of 40-140 MPA.
- Rods formed by solid state extrusion had bending strengths up to 200 MPA (“Enhancement of the mechanical properties of polylactides by solid-state extrusion,” Biomaterials 17, (March, 1996, 529-535). Further information about PLA and its properties is provided in a chapter entitled “Present and Future of PLA Polymers” in the book Degradable Polymers, Recycling, and Plastics Waste Management, Ed.
- Other mechanical parts that may be more easily left in a well than retrieved may also be formed from degradable polymer such as PLA.
- the case or container of perforating devices may be formed of degradable polymer. After a selected time, the device may then be easily flowed from the well, if desired.
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Abstract
Description
Claims (17)
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Also Published As
Publication number | Publication date |
---|---|
US20120267101A1 (en) | 2012-10-25 |
US20040231845A1 (en) | 2004-11-25 |
US20070225175A1 (en) | 2007-09-27 |
US8439108B2 (en) | 2013-05-14 |
US8025104B2 (en) | 2011-09-27 |
US8215385B2 (en) | 2012-07-10 |
US7625846B2 (en) | 2009-12-01 |
USRE45849E1 (en) | 2016-01-19 |
USRE46028E1 (en) | 2016-06-14 |
US20080115932A1 (en) | 2008-05-22 |
US20080015120A1 (en) | 2008-01-17 |
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