CA1311116C - Process for removing flow-restricting material from wells - Google Patents
Process for removing flow-restricting material from wellsInfo
- Publication number
- CA1311116C CA1311116C CA000598932A CA598932A CA1311116C CA 1311116 C CA1311116 C CA 1311116C CA 000598932 A CA000598932 A CA 000598932A CA 598932 A CA598932 A CA 598932A CA 1311116 C CA1311116 C CA 1311116C
- Authority
- CA
- Canada
- Prior art keywords
- particulate material
- phenolic resin
- resin
- wellbore
- cured
- 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 - Lifetime
Links
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
- C09K8/56—Compositions for consolidating loose sand or the like around wells without excessively decreasing the permeability thereof
- C09K8/57—Compositions based on water or polar solvents
- C09K8/575—Compositions based on water or polar solvents containing organic compounds
- C09K8/5751—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
- C09K8/52—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning
-
- 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
- Y10S507/927—Well cleaning fluid
- Y10S507/929—Cleaning organic contaminant
Abstract
ABSTRACT
An improved process for removing from a wellbore in a subterranean formation particulate material bonded together by a cured phenolic resin. The material is contacted with a solvent composition comprising a liquid selected from the groups: N,N-dimethylformamide, N-methyl-2-pyrrolidone and mixtures therof for a sufficient time to separate the particulate material and then the separated material is removed from the wellbore.
An improved process for removing from a wellbore in a subterranean formation particulate material bonded together by a cured phenolic resin. The material is contacted with a solvent composition comprising a liquid selected from the groups: N,N-dimethylformamide, N-methyl-2-pyrrolidone and mixtures therof for a sufficient time to separate the particulate material and then the separated material is removed from the wellbore.
Description
PROCESS FOR REMOVING Fl.OW-RESTRICTING MATERIALS FROM WELLS
This invention relates to a process For removing flow-restricting material from a wellbore in a subterranean formation which has been trea-ted with a particulate material coated with a curable phenolic resin.
BACKGROUND OF THE INVENTION
Subterranean formations surrounding oil wells, gas wells, water wells and other similar bore holes, are frequently treated with particulate material such as sand which has been coated with a curable phenolic resin.
The type of treatments vary but can include hydraulic fracturing, sand consolidation, and gravel pack completion. In these treatments the coated particulate material is injected into the we~l and into the gealogical formation surrounding the bore hole. The curable phenolic resin coating on the particulate material is cured in the formation to bond the particulate material together. This gives a permeable Filter which prevents small sand particles and other finely divided material from blocking the perforations in the well casings and from damaging the pumping and other handling equipment.
Occasionally an excess of the resin coated particulate material is pumped down into the well and fills the wellbore above the perforations in the well casing. If the resin coating on the particulate material cures within the wellbore, it Forms a consolidated mass which drastically impedes the flow of liquid from the well. When this occurs, it is o-Ften necessary to employ a ~ 3 ~ 6 special boring rig to remove the consolidated material to obtain satisfactory production From the well. Such a procedure is both time-consuming and expen-slve.
We have now discovered that certain solvents will break up the consolidated material permitting its removal from the wellbore without the need to resort to the costly boring procedure.
SUMMARY OF THE INVENTION
In accordance w;th th;s invention there ;s provided a process for removing from a wellbore in a subterranean formation particulate material which has been bonded together by a cured phenolic resin. Th;s process comprises contacting the bonded part;culate mater;al with a solvent composi-t;on containing a liquid selected from the group N,N-dimethylformamide, N-methyl-2-pyrrolidone, and mixtures thereoF for a su-Fficient time to break up the particulate material. The separated material is then removed from the wellbore.
DETAILED OESCRIPTION OF THE INVENTION
As mentianed previously, wells are frequently treated with part;cu-late mater;al coated w;th a curable phenolic resin. The particulate materials used for this purpose include, for example, sand, sintered bauxite, zircon and glass beads. The curable phenolic resins used to coa-t the particulate mater-ial are either novolak or resole resins. As is well known in the art, theresole resins can cure and harden by hea-t alone. On the other hand, the no~olak resins require the presence of a curing agent such as hexamethylene-tetramine to make them heat curable. ~rhe phenolic resin can a1so be phenol f~rmaldehyde resin, ~3 ~
When an excess of the resin coated material is pumped down the well it may fill the wellbore to a leve1 above the perforations in the well casing.
This is known in the industry as a screenout. When a screenout occurs, the flow rate from the well is greatly reduced. If the resin coating on the particulate material has not yet cured it is sometimes possible to remove the excess material From the ~ellbore by means of a water jet. However, the resin coating on the particulate material may cure due to the elevated temperature in the well. In the curing process, resin coatlng one particle cross-links with resin coating adjacent particles thereby binding the part;culate material into a flow-restr;cting, consolidated mass. When th;s occurs it is almost impossible to remove this flow-restricting material by a water jet. It has been necessary to resort to an expensive drilling to open up the wellbore.
In the practice of the present invention a solvent composition is ùsed to dissolve part of the cured resin which binds the part;cu1ate mater;al together. Enough of the res;n is dissolved to caùse -the solid mass to disin-tegrate. The loosened particulate materi al can then be pumped From the well.
Most of the common solvents are unsu;table for this purpose. The present invention is based on the discovery that two 1 iquids, N,N-dimethylformamide and N-methyl-2-pyrrolidone, are capable of breaking up the solid mass.
The solvent compositions used in the practice of this invention can be the foregoing liquids without dilution (neat) or the l;quids can be diluted with from about 1% to about 40% by volume o-F a diluent. Various diluents, including water, may be used for this purpose.
In carrying out the process of this invention, the solvent composi-tion is pumped into the well to contact the material which has been bonded together with the cured phenolic resin. The solvent composition is maintained in contact with the flow-inhibiting material for a sufFicient tirne to cause this material to soften or break up and become flowable. The mixture of solvent and flowable material is then displaced from the well by means of water or other displacing fluid.
The solvent composit;ons used in the practice of this invention are most ef~ective when they are maintained in contact with the flow-inhibiting material at temperatures of ~rom about 40C to about 150C. Such temperatures are usually present in the subterranean formations where this invention is practiced. In certain applications it may be desirable to warm the solvent composition before it is placed ;n the well.
The following examples illustrate the invention. It is to be understood that the examples are illustrative only and are not intended to l;mit the ;nvention in any way. ~n the examples all parts and percentages are by weight unless otherwise indicated~
A slurry of resin coated sand in 2% aqueous KCl solution was packed in polypropylene tubing, sealed and heated at 93C for 24 hours. This caused the resin coating to cure, bonding together the sand particles to form a slug of about 0.64 x 5cm. The resin coated sand was ACFRAC CR 20/40, a sand coated with a curable phenolic res;n available from the Acme Resin Corporation, Westchester, Illinois. Slugs composed of sand bonded together by the cured resin coated sand were contacted with N-methyl-2-Pyrrolidone at various temperatures and the time at which disintegration of the slùg occurred was noted. The experiments were repeated us;ng N-methyl-2-pyrrolidone diluted with varying amounts of water. The results given in Table I demonstrate that N-methyl-2-pyrrolidone is capable of separating the bonded sand particles even when the solvent ;s d;l uted w; th water.
~, * Trade Mark ,~ .
~ 3 ~ $
TABLE I
EFFECT OF N-METHYL-2-P'(RROLIDONE (MPD) ON
Contact SolventTemp. (C) Time (hrs) Results MPD (neat) Z1 48 No Apparent Effect 66 3 S1ug Disintegrated 93 1 Slug Disintegrated MPD/H2o 75/25 (vol)21 72 Slug Disintegrated 66 3 Slug Dislntegrated 93 2 Slug Disintegrated MPD/H2o 50/50 (vol)21 48 No Apparent Effect 93 48 No Apparent Effect The general procedure of Example 1 was followed except that N,N dimethylformamide was used instead of N-methyl-2-pyrrolidone. The results given in Table II show that this solvent, either neat or diluted with watPr, is effective in separating the bonded sand particles.
TABLE II
EFFECT OF N N-OIMETHYLFORMAMIDE (DMF) ON
SAND PARTICLE5~ WITH A PHENOLIC _ IN
Contact Sol_entTemp ~C) Time (hrs) Results DMF (neat) 21 16 Slug SoFtened 66 1 Slug Disintegrated 93 1 Slug Disintegrated 75/25 (vo1)21 72 Slug SoFtened 66 4 Slug Disintegrated 93 1 Slug Disintegrated 50/50 (vol)21 48 No Apparent EFfect 93 48 No Apparent Effect -~ 3 ~
Thus it is apparent that there has been provided, in accordance with the invention, a process for removing flow-restricting material From a well-bore in a subterranean formation that fully satlsfies the oojective, aims and advantages set forth above. While the invention has been described in con-junction with speciFic embodiments thereof, it is eviden-t that many alterna-tives, modifications, and variations will be apparent to those skilled in the art in light of the foregoing description. Accordingly, it is intended to include all such alternatives, modifications, and varia-tions as set forth within the spirit and scope of the appended claims.
This invention relates to a process For removing flow-restricting material from a wellbore in a subterranean formation which has been trea-ted with a particulate material coated with a curable phenolic resin.
BACKGROUND OF THE INVENTION
Subterranean formations surrounding oil wells, gas wells, water wells and other similar bore holes, are frequently treated with particulate material such as sand which has been coated with a curable phenolic resin.
The type of treatments vary but can include hydraulic fracturing, sand consolidation, and gravel pack completion. In these treatments the coated particulate material is injected into the we~l and into the gealogical formation surrounding the bore hole. The curable phenolic resin coating on the particulate material is cured in the formation to bond the particulate material together. This gives a permeable Filter which prevents small sand particles and other finely divided material from blocking the perforations in the well casings and from damaging the pumping and other handling equipment.
Occasionally an excess of the resin coated particulate material is pumped down into the well and fills the wellbore above the perforations in the well casing. If the resin coating on the particulate material cures within the wellbore, it Forms a consolidated mass which drastically impedes the flow of liquid from the well. When this occurs, it is o-Ften necessary to employ a ~ 3 ~ 6 special boring rig to remove the consolidated material to obtain satisfactory production From the well. Such a procedure is both time-consuming and expen-slve.
We have now discovered that certain solvents will break up the consolidated material permitting its removal from the wellbore without the need to resort to the costly boring procedure.
SUMMARY OF THE INVENTION
In accordance w;th th;s invention there ;s provided a process for removing from a wellbore in a subterranean formation particulate material which has been bonded together by a cured phenolic resin. Th;s process comprises contacting the bonded part;culate mater;al with a solvent composi-t;on containing a liquid selected from the group N,N-dimethylformamide, N-methyl-2-pyrrolidone, and mixtures thereoF for a su-Fficient time to break up the particulate material. The separated material is then removed from the wellbore.
DETAILED OESCRIPTION OF THE INVENTION
As mentianed previously, wells are frequently treated with part;cu-late mater;al coated w;th a curable phenolic resin. The particulate materials used for this purpose include, for example, sand, sintered bauxite, zircon and glass beads. The curable phenolic resins used to coa-t the particulate mater-ial are either novolak or resole resins. As is well known in the art, theresole resins can cure and harden by hea-t alone. On the other hand, the no~olak resins require the presence of a curing agent such as hexamethylene-tetramine to make them heat curable. ~rhe phenolic resin can a1so be phenol f~rmaldehyde resin, ~3 ~
When an excess of the resin coated material is pumped down the well it may fill the wellbore to a leve1 above the perforations in the well casing.
This is known in the industry as a screenout. When a screenout occurs, the flow rate from the well is greatly reduced. If the resin coating on the particulate material has not yet cured it is sometimes possible to remove the excess material From the ~ellbore by means of a water jet. However, the resin coating on the particulate material may cure due to the elevated temperature in the well. In the curing process, resin coatlng one particle cross-links with resin coating adjacent particles thereby binding the part;culate material into a flow-restr;cting, consolidated mass. When th;s occurs it is almost impossible to remove this flow-restricting material by a water jet. It has been necessary to resort to an expensive drilling to open up the wellbore.
In the practice of the present invention a solvent composition is ùsed to dissolve part of the cured resin which binds the part;cu1ate mater;al together. Enough of the res;n is dissolved to caùse -the solid mass to disin-tegrate. The loosened particulate materi al can then be pumped From the well.
Most of the common solvents are unsu;table for this purpose. The present invention is based on the discovery that two 1 iquids, N,N-dimethylformamide and N-methyl-2-pyrrolidone, are capable of breaking up the solid mass.
The solvent compositions used in the practice of this invention can be the foregoing liquids without dilution (neat) or the l;quids can be diluted with from about 1% to about 40% by volume o-F a diluent. Various diluents, including water, may be used for this purpose.
In carrying out the process of this invention, the solvent composi-tion is pumped into the well to contact the material which has been bonded together with the cured phenolic resin. The solvent composition is maintained in contact with the flow-inhibiting material for a sufFicient tirne to cause this material to soften or break up and become flowable. The mixture of solvent and flowable material is then displaced from the well by means of water or other displacing fluid.
The solvent composit;ons used in the practice of this invention are most ef~ective when they are maintained in contact with the flow-inhibiting material at temperatures of ~rom about 40C to about 150C. Such temperatures are usually present in the subterranean formations where this invention is practiced. In certain applications it may be desirable to warm the solvent composition before it is placed ;n the well.
The following examples illustrate the invention. It is to be understood that the examples are illustrative only and are not intended to l;mit the ;nvention in any way. ~n the examples all parts and percentages are by weight unless otherwise indicated~
A slurry of resin coated sand in 2% aqueous KCl solution was packed in polypropylene tubing, sealed and heated at 93C for 24 hours. This caused the resin coating to cure, bonding together the sand particles to form a slug of about 0.64 x 5cm. The resin coated sand was ACFRAC CR 20/40, a sand coated with a curable phenolic res;n available from the Acme Resin Corporation, Westchester, Illinois. Slugs composed of sand bonded together by the cured resin coated sand were contacted with N-methyl-2-Pyrrolidone at various temperatures and the time at which disintegration of the slùg occurred was noted. The experiments were repeated us;ng N-methyl-2-pyrrolidone diluted with varying amounts of water. The results given in Table I demonstrate that N-methyl-2-pyrrolidone is capable of separating the bonded sand particles even when the solvent ;s d;l uted w; th water.
~, * Trade Mark ,~ .
~ 3 ~ $
TABLE I
EFFECT OF N-METHYL-2-P'(RROLIDONE (MPD) ON
Contact SolventTemp. (C) Time (hrs) Results MPD (neat) Z1 48 No Apparent Effect 66 3 S1ug Disintegrated 93 1 Slug Disintegrated MPD/H2o 75/25 (vol)21 72 Slug Disintegrated 66 3 Slug Dislntegrated 93 2 Slug Disintegrated MPD/H2o 50/50 (vol)21 48 No Apparent Effect 93 48 No Apparent Effect The general procedure of Example 1 was followed except that N,N dimethylformamide was used instead of N-methyl-2-pyrrolidone. The results given in Table II show that this solvent, either neat or diluted with watPr, is effective in separating the bonded sand particles.
TABLE II
EFFECT OF N N-OIMETHYLFORMAMIDE (DMF) ON
SAND PARTICLE5~ WITH A PHENOLIC _ IN
Contact Sol_entTemp ~C) Time (hrs) Results DMF (neat) 21 16 Slug SoFtened 66 1 Slug Disintegrated 93 1 Slug Disintegrated 75/25 (vo1)21 72 Slug SoFtened 66 4 Slug Disintegrated 93 1 Slug Disintegrated 50/50 (vol)21 48 No Apparent EFfect 93 48 No Apparent Effect -~ 3 ~
Thus it is apparent that there has been provided, in accordance with the invention, a process for removing flow-restricting material From a well-bore in a subterranean formation that fully satlsfies the oojective, aims and advantages set forth above. While the invention has been described in con-junction with speciFic embodiments thereof, it is eviden-t that many alterna-tives, modifications, and variations will be apparent to those skilled in the art in light of the foregoing description. Accordingly, it is intended to include all such alternatives, modifications, and varia-tions as set forth within the spirit and scope of the appended claims.
Claims (9)
1. A process for removing from a wellbore in a subterranean formation particulate material bonded together by a cured phenolic resin characterized by the steps of:
contacting said particulate material, bonded together by a cured phenolic resin, with a solvent composition comprising a liquid selected from the group consisting of N,N-dimethylformamide, N-methyl-2-pyrrolidone, and mixtures thereof for a sufficient time to separate the particulate material; and removing the separated particulate material from the wellbore.
contacting said particulate material, bonded together by a cured phenolic resin, with a solvent composition comprising a liquid selected from the group consisting of N,N-dimethylformamide, N-methyl-2-pyrrolidone, and mixtures thereof for a sufficient time to separate the particulate material; and removing the separated particulate material from the wellbore.
2. The process of claim 1 characterized in that the solvent composition contains from about 1% to about 40% by volume of a diluent.
3. The process of claim 2 characterized in that the diluent is water.
4. The process of claim 1 characterized in that the particulate material bonded together by a cured phenolic resin is contacted with the solvent composition at a temperature of from about 40°C to about 150°C.
5. The process of claim 1 characterized in that the particulate matter is sand.
6. The process of claim 1 characterized in that the particulate matter is sintered bauxite.
7. The process of claim 1 characterized in that the phenolic resin is a phenolformaldehyde resin.
8. The process of claim 1 characterized in that the phenolic resin is a resole resin.
9. The process of claim 1 characterized in that the phenolic resin is a novalak resin cured with hexamethylenetetramine.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US07/274,354 US4848470A (en) | 1988-11-21 | 1988-11-21 | Process for removing flow-restricting materials from wells |
| US274,354 | 1988-11-21 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1311116C true CA1311116C (en) | 1992-12-08 |
Family
ID=23047835
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000598932A Expired - Lifetime CA1311116C (en) | 1988-11-21 | 1989-05-08 | Process for removing flow-restricting material from wells |
Country Status (9)
| Country | Link |
|---|---|
| US (1) | US4848470A (en) |
| CA (1) | CA1311116C (en) |
| DE (1) | DE3915342A1 (en) |
| DK (1) | DK171719B1 (en) |
| GB (1) | GB2225046B (en) |
| IE (1) | IE62845B1 (en) |
| MX (1) | MX165638B (en) |
| NL (1) | NL8902204A (en) |
| NO (1) | NO177063C (en) |
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Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3402770A (en) * | 1965-06-02 | 1968-09-24 | Mobil Oil Corp | Multiple-purpose solvent and method for treating subterranean formations |
| US3976135A (en) * | 1972-10-02 | 1976-08-24 | Halliburton Company | Method of forming a highly permeable solid mass in a subterranean formation |
| GB1507472A (en) * | 1974-05-02 | 1978-04-12 | Bunker Ramo | Foamable coating remover composition |
| US4276186A (en) * | 1979-06-26 | 1981-06-30 | International Business Machines Corporation | Cleaning composition and use thereof |
| US4487265A (en) * | 1981-12-22 | 1984-12-11 | Union Oil Company Of California | Acidizing a subterranean reservoir |
| US4514310A (en) * | 1982-08-31 | 1985-04-30 | Mobil Oil Corporation | High temperature stable fluids for wellbore treatment containing non-aqueous solvents |
| SU1079823A1 (en) * | 1983-01-07 | 1984-03-15 | Конструкторское бюро производственного объединения "Саратовнефтегаз" | Buffer fluid for separating polymer-clay drilling mud stabilized with nitron agent from plugging composition |
| US4541489A (en) * | 1984-03-19 | 1985-09-17 | Phillips Petroleum Company | Method of removing flow-restricting materials from wells |
-
1988
- 1988-11-21 US US07/274,354 patent/US4848470A/en not_active Expired - Fee Related
-
1989
- 1989-04-20 GB GB8908969A patent/GB2225046B/en not_active Expired - Fee Related
- 1989-05-05 IE IE147789A patent/IE62845B1/en not_active IP Right Cessation
- 1989-05-08 CA CA000598932A patent/CA1311116C/en not_active Expired - Lifetime
- 1989-05-10 DE DE3915342A patent/DE3915342A1/en not_active Withdrawn
- 1989-05-19 DK DK244089A patent/DK171719B1/en not_active IP Right Cessation
- 1989-08-01 MX MX017014A patent/MX165638B/en unknown
- 1989-08-31 NL NL8902204A patent/NL8902204A/en not_active Application Discontinuation
- 1989-10-11 NO NO894061A patent/NO177063C/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| GB2225046B (en) | 1992-07-08 |
| DK244089A (en) | 1990-05-22 |
| DK244089D0 (en) | 1989-05-19 |
| US4848470A (en) | 1989-07-18 |
| DE3915342A1 (en) | 1990-05-23 |
| IE891477L (en) | 1990-05-21 |
| NO177063C (en) | 1995-07-12 |
| NO894061D0 (en) | 1989-10-11 |
| GB8908969D0 (en) | 1989-06-07 |
| NL8902204A (en) | 1990-06-18 |
| IE62845B1 (en) | 1995-03-08 |
| DK171719B1 (en) | 1997-04-07 |
| NO894061L (en) | 1990-05-22 |
| MX165638B (en) | 1992-11-25 |
| GB2225046A (en) | 1990-05-23 |
| NO177063B (en) | 1995-04-03 |
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| Date | Code | Title | Description |
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| MKLA | Lapsed |