CN101086210A - Profile control and water plugging technology for coal bed gas - Google Patents
Profile control and water plugging technology for coal bed gas Download PDFInfo
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- CN101086210A CN101086210A CN 200710012097 CN200710012097A CN101086210A CN 101086210 A CN101086210 A CN 101086210A CN 200710012097 CN200710012097 CN 200710012097 CN 200710012097 A CN200710012097 A CN 200710012097A CN 101086210 A CN101086210 A CN 101086210A
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Abstract
The invention relates to a coal bed air-regulating agent water shutoff technology it is based on geological features and fracturing transformation parameters of the coal bed methane, determine the water layer, constitute the overall water shutoff profile control programmes; the technology programmes of the water blocking and the amount is designed in accordance with the principle that water shutoff gel system subparagraph design , intensity gradually increased, moderate gel viscosity and various sect crosslinking time reasonable; construction in accordance with the above design programmes. The invention rational design, process is simple and easy construction, can be achieved selective water shutoff using the technology, stopping the channel between the coalbed methane wells and storage and not plug the coal reservoir cleats, fissures and cracks fracturing and thereby effectively drainage relief to ensure normal production of the coalbed methane wells.
Description
Technical field:
The present invention relates to a kind of technology that the coal-bed gas exploitation process solves out water problems that is used for.
Background technology:
Coal-bed gas exploitation is one of approach of alleviating energy scarcity.At present, on-the-spot when carrying out coal-bed gas exploitation usually based on reservoir reconstruction after drainage and step-down.But,, if the situation of a large amount of water storages is linked up in pit shaft and storage area, then lack and can block the unlikely again obstruction coal seam reservoirs of exhalant canal hugger, crack and transform the technology in crack behind the reservoir reconstruction in the area of geological structure more complicated.This technical barrier is restricted the coal-bed gas exploitation process, and the utmost point is treated in production reality the technology that research and development are used to address the above problem, and constantly in addition perfect.
Summary of the invention:
The object of the present invention is to provide a kind of passage that can stop up between coal bed gas well pit shaft and the storage area can keep the profile control and water plugging technology for coal bed gas that effective drainage and step-down purpose was not stopped up, reached in the hugger of coal seam reservoirs, crack and transformation crack again.
Technical scheme of the present invention is as follows.This kind profile control and water plugging technology is according to coal bed gas well geologic feature and fracturing reform parameter, judges water exit, formulates the overall plan of profile control and water plugging; Divide the process program that slug design, intensity strengthen gradually, the gel viscosity is moderate, the rational principle of each slug crosslinking time designs water shutoff agent and consumption thereof according to the water blockoff gel rubber system; Construct according to above-mentioned design scheme.The implementation step and the technical essential of this technology are as follows:
1, according to coal bed gas well geologic feature and fracturing reform parameter, judge water exit, formulate profile control and water plugging overall plan;
2, adopt the constructure scheme of which kind of water shutoff agent and consumption thereof according to the principle design that divides that slug design, intensity strengthen gradually, the gel viscosity is moderate, each slug crosslinking time is reasonably constructed of water blockoff gel rubber system; Wherein, gel is mixed by mother liquor and crosslinking agent and forms, and wherein mother liquor is the polyacrylamide (HAMP) of concentration 0.04-1.0%, and crosslinking agent is a phenol-formaldehyde resin modified; Amount of gel is according to pressure break situation (adding sand amount, pressure break amount, injection pressure) and target zone geologic feature (formation temperature, strata pressure, in-place permeability and situation in debt) design, the large fracture passage that the filling pressure break forms;
3, adopt variable concentrations gel and packing material to divide slug to inject,, effectively control water and advance to realize the integral gradient water blockoff, when pressure anomaly occurring in the work progress, timely set-up procedure and relevant gel parameter; Wherein, packing material is elastic granule and inert fiber, also can singly use elastic granule, and consumption is 1-5%, and wherein elastic granule adopts the rubber material to make, and particle diameter is two kinds in 40 orders and 80 orders; Slug injection length, gelation time depend on the injection discharge capacity;
4, inject water shutoff agent step by step after, wait to coagulate 8 hours.If in injection process, find leakage, should in time inject sealing agent, when being stabilized in certain pressure, carry out follow-up construction again;
5, Hou Ninghou, sand washing is to the artificial bottom of a well, and following flow string is gone into operation.
The present invention is reasonable in design, and technology is simple, is easy to construction, utilize this technology can realize selective water plugging, stop up the passage between coal bed gas well pit shaft and the storage area, and the hugger of unlikely obstruction coal seam reservoirs, crack and fracturing reform crack, thereby effectively drainage and step-down guarantees the coal bed gas well ordinary production.
Embodiment 1: the production fluid amount was higher after certain coal bed gas well L18 pressure break was gone into operation, day displacement 45m
3, the exploitation of restriction payzone coal bed gas.Binding purpose coal geology feature and fracturing parameter judge that the possibility of top water outlet is bigger, formulate the back-up sand of bottom purpose payzone pit shaft elder generation, top payzone enforcement selective chemical profile control and water plugging, last sand washing or drag for the overall plan that sand recovers the bottom payzone; Then, according to water shutoff agent and the consumption thereof that plug water construction principle design precedence divides slug to inject, this well adopts two slugs to inject, and injection rate, injection length, gelation time are as shown in the table:
| Step | Composition | Injection rate | Inject discharge capacity m 3/min | Injection length | Gelation time |
| One | Strong gel+elastic granule (2%)+inert fiber (2%) | 100m 3 | 0.4-0.8 | 6 hours | 8 hours |
| Two | High-strength gel+elastic granule (2%) | 130m 3 | 0.3-0.8 | 7 hours | 5 hours |
| Three | Viscous water | 10m 3 | |||
| Four | Clear water | 8m 3 | Just for clear water 3m 3Anti-for clear water 5m 3 | ||
As seen from the above table, the water shutoff agent consumption of design is 230m
3
According to above design scheme, distribute to inject water shutoff agent by injection parameter, Hou Ning sand washing or drag for sand after 8 hours to the artificial bottom of a well, following flow string is gone into operation.
Embodiment 2: the production fluid amount was higher after another coal bed gas well L15 pressure break was gone into operation, day displacement 50m
3, similar with the L18 well, according to adopting three slugs of branch as shown in the table to inject water shutoff agent after this well geologic feature and the fracturing parameter formulation overall plan:
| Step | Composition | Injection rate | Inject discharge capacity m 3/min | Injection length | Gelation time |
| One | In strong gel+elastic granule (1%) | 200m 3 | 0.5-1.0 | 8 hours | 12 hours |
| Two | Strong gel+elastic granule (3%)+inert fiber (2%) | 100m 3 | 0.4-0.8 | 6 hours | 8 hours |
| Three | High-strength gel+elastic granule (5%) | 100m 3 | 0.3-0.8 | 6 hours | 6 hours |
| Four | Clear water | 15m 3 | Just for clear water 5m 3Anti-for clear water 10m 3 | ||
。
Claims (1)
1, a kind of coal bed gas adjustment water-plugging technique is characterized in that this kind profile control and water plugging technology is according to coal bed gas well geologic feature and fracturing reform parameter, judges water exit, formulates the overall plan of profile control and water plugging; Divide the process program that slug design, intensity strengthen gradually, the gel viscosity is moderate, the rational principle of each slug crosslinking time designs water shutoff agent and consumption thereof according to the water blockoff gel rubber system; Construct according to above-mentioned design scheme; The implementation step and the technical essential of this technology are as follows:
(1), according to coal bed gas well geologic feature and fracturing reform parameter, judge water exit, formulate profile control and water plugging overall plan;
(2), adopt the constructure scheme of which kind of water shutoff agent and consumption thereof according to the principle design that divides that slug design, intensity strengthen gradually, the gel viscosity is moderate, each slug crosslinking time is reasonably constructed of water blockoff gel rubber system; Wherein, gel is mixed by mother liquor and crosslinking agent and forms, and wherein mother liquor is the polyacrylamide of concentration 0.04-1.0%, and crosslinking agent is a phenol-formaldehyde resin modified; Amount of gel is according to pressure break situation and the design of target zone geologic feature, the large fracture passage that the filling pressure break forms; Amount of gel is according to pressure break situation and the design of target zone geologic feature, the large fracture passage that the filling pressure break forms;
(3), adopt variable concentrations gel and packing material to divide slug to inject to realize the integral gradient water blockoff, effectively control water and advance, when pressure anomaly occurring in the work progress, in time set-up procedure and relevant gel parameter; Packing material is elastic granule and inert fiber, also can singly use elastic granule, and consumption is 1-5%, and wherein elastic granule adopts the rubber material to make, and particle diameter is two kinds in 40 orders and 80 orders; Slug injection length, gelation time depend on the injection discharge capacity;
(4), step by step after injecting water shutoff agent, wait and coagulated 8 hours,, should in time inject sealing agent, when being stabilized in certain pressure, carry out follow-up construction again if in injection process, find leakage;
(5), Hou Ninghou, sand washing is to the artificial bottom of a well, following flow string is gone into operation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200710012097 CN101086210A (en) | 2007-07-13 | 2007-07-13 | Profile control and water plugging technology for coal bed gas |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200710012097 CN101086210A (en) | 2007-07-13 | 2007-07-13 | Profile control and water plugging technology for coal bed gas |
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| CN101086210A true CN101086210A (en) | 2007-12-12 |
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| CN 200710012097 Pending CN101086210A (en) | 2007-07-13 | 2007-07-13 | Profile control and water plugging technology for coal bed gas |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101949272A (en) * | 2010-08-26 | 2011-01-19 | 中国石油集团川庆钻探工程有限公司 | Method for performing workover on oil and gas wells by using chemical gel |
| CN101899291B (en) * | 2009-05-27 | 2012-11-14 | 中国石油天然气股份有限公司 | Annular chemical packer material for water plugging of horizontal well |
| CN102926701A (en) * | 2012-10-31 | 2013-02-13 | 中国石油集团川庆钻探工程有限公司 | Continuous mixing type water plugging technique |
| CN103711452A (en) * | 2013-12-31 | 2014-04-09 | 西南石油大学 | Gel plug packing well control method |
| CN101314711B (en) * | 2008-07-18 | 2014-08-27 | 中国石油大学(华东) | Elastic particle oil displacement profile control agent, displacement of reservoir oil system and displacement of reservoir oil method |
| CN104100224A (en) * | 2013-04-03 | 2014-10-15 | 中国石油天然气股份有限公司 | Oil well water plugging method |
| CN105505355A (en) * | 2014-09-25 | 2016-04-20 | 中国石油天然气股份有限公司 | Clear water-sewage mixed profile control agent |
| CN106761548A (en) * | 2016-12-30 | 2017-05-31 | 中国石油天然气股份有限公司 | A kind of method that sealing agent injection thick oil pay closure is washed by force bar by utilization pressure break |
| CN112094629A (en) * | 2020-09-07 | 2020-12-18 | 中国海洋石油集团有限公司 | Plugging agent suitable for fractured oil reservoir |
| CN113250663A (en) * | 2021-06-23 | 2021-08-13 | 中国石油大学(华东) | Optimal design method for injection parameters of medium-low permeability reservoir emulsion-polymer composite system |
| CN114233262A (en) * | 2021-12-27 | 2022-03-25 | 西安石油大学 | Method for supporting unconsolidated hydrate reservoir fracture by using modified hydrogel in auxiliary mode |
| CN114482918A (en) * | 2022-01-28 | 2022-05-13 | 中海石油(中国)有限公司 | Profile control method for low-speed discontinuous injection |
-
2007
- 2007-07-13 CN CN 200710012097 patent/CN101086210A/en active Pending
Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101314711B (en) * | 2008-07-18 | 2014-08-27 | 中国石油大学(华东) | Elastic particle oil displacement profile control agent, displacement of reservoir oil system and displacement of reservoir oil method |
| CN101899291B (en) * | 2009-05-27 | 2012-11-14 | 中国石油天然气股份有限公司 | Annular chemical packer material for water plugging of horizontal well |
| CN101949272A (en) * | 2010-08-26 | 2011-01-19 | 中国石油集团川庆钻探工程有限公司 | Method for performing workover on oil and gas wells by using chemical gel |
| CN102926701A (en) * | 2012-10-31 | 2013-02-13 | 中国石油集团川庆钻探工程有限公司 | Continuous mixing type water plugging technique |
| CN102926701B (en) * | 2012-10-31 | 2015-08-19 | 中国石油集团川庆钻探工程有限公司 | A kind of mixed matching water-plugging technology method continuously |
| CN104100224B (en) * | 2013-04-03 | 2016-12-28 | 中国石油天然气股份有限公司 | A kind of oilwell water shutoff method |
| CN104100224A (en) * | 2013-04-03 | 2014-10-15 | 中国石油天然气股份有限公司 | Oil well water plugging method |
| CN103711452A (en) * | 2013-12-31 | 2014-04-09 | 西南石油大学 | Gel plug packing well control method |
| CN103711452B (en) * | 2013-12-31 | 2016-01-06 | 西南石油大学 | A kind of gel slug packing well control method |
| CN105505355A (en) * | 2014-09-25 | 2016-04-20 | 中国石油天然气股份有限公司 | Clear water-sewage mixed profile control agent |
| CN106761548A (en) * | 2016-12-30 | 2017-05-31 | 中国石油天然气股份有限公司 | A kind of method that sealing agent injection thick oil pay closure is washed by force bar by utilization pressure break |
| CN106761548B (en) * | 2016-12-30 | 2019-02-12 | 中国石油天然气股份有限公司 | A method of sealing agent injection thick oil pay being blocked into strong washing item using pressure break |
| CN112094629A (en) * | 2020-09-07 | 2020-12-18 | 中国海洋石油集团有限公司 | Plugging agent suitable for fractured oil reservoir |
| CN112094629B (en) * | 2020-09-07 | 2022-08-30 | 中国海洋石油集团有限公司 | Plugging agent suitable for fractured oil reservoir |
| CN113250663A (en) * | 2021-06-23 | 2021-08-13 | 中国石油大学(华东) | Optimal design method for injection parameters of medium-low permeability reservoir emulsion-polymer composite system |
| CN114233262A (en) * | 2021-12-27 | 2022-03-25 | 西安石油大学 | Method for supporting unconsolidated hydrate reservoir fracture by using modified hydrogel in auxiliary mode |
| CN114233262B (en) * | 2021-12-27 | 2023-10-27 | 西安石油大学 | Method for supporting unconsolidated hydrate reservoir fracture with assistance of modified hydrogel |
| CN114482918A (en) * | 2022-01-28 | 2022-05-13 | 中海石油(中国)有限公司 | Profile control method for low-speed discontinuous injection |
| CN114482918B (en) * | 2022-01-28 | 2024-01-23 | 中海石油(中国)有限公司 | Profile control method for low-speed discontinuous injection |
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Open date: 20071212 |