CN102182421A - Segmented water plugging method of liquid bridge plug of horizontal well - Google Patents
Segmented water plugging method of liquid bridge plug of horizontal well Download PDFInfo
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- CN102182421A CN102182421A CN2011100783313A CN201110078331A CN102182421A CN 102182421 A CN102182421 A CN 102182421A CN 2011100783313 A CN2011100783313 A CN 2011100783313A CN 201110078331 A CN201110078331 A CN 201110078331A CN 102182421 A CN102182421 A CN 102182421A
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Abstract
The invention provides a segmented water plugging method of a liquid bridge plug of a horizontal well. The method comprises the following steps of: lowering an oil tube at a tiptoe position of the horizontal well, injecting a prepared liquid bridge plug solution into the horizontal well by a positive alternate method, and filling a horizontal section of a well shaft; lifting the oil tube, setting a port position of the oil tube at a water outlet part of an oil well, and carrying out water displacement on the liquid bridge plug to make part of well sections filled with water, wherein the part of well sections is a water plugging target well section; waiting on cement to make the liquid bridge plug become gel, filling the well sections, except the water plugging target well section, of the horizontal section of the well shaft, and finishing temporary plugging protection process; injecting a plugging agent by using the conventional tubular column to make the target well section effectively plugged, and not injecting the plugging agent into the protected well sections; injecting a small amount of steam or breaker by using the conventional tubular column to make the gel of the liquid bridge plug thoroughly broken and become a low-viscosity water solution; and lifting out a construction tubular column to finish the whole water-plugging construction process. By the invention, temporary plugging at any position in the horizontal well can be realized, and the aim of segmented water plugging is fulfilled.
Description
Technical field
The present invention relates to technical field of petroleum extraction, specifically is about a kind of horizontal well liquid bridging plug segmentation shutoff method, is to use high molecular polymer to be used for the horizontal well in segments water blockoff to improve the process of recovery ratio.
Background technology
The horizontal well majority is at heavy crude reservoir, and the profit mobility ratio is very high, and the water saturation of some draining passage slightly rises and promptly can bring out moisture rising significantly, in case water breakthrough, the crude oil output capacity just sharply reduces, and the water treatment expense increases.If there is not suitable remedial measure, certainly will close too early.Suitably adopting and transferring the too much water outlet of plugging technique inhibition horizontal well is the effective means that solves the problem that faces.
Water plugging of horizontal well has adopted polymer+general injection more than 80% at present, and regulation effect is of inadequate achievement, and the successful experience that indivedual individual wells are obtained is difficult in other horizontal well popularization and general.And at present water plugging of horizontal well is with mechanical means (packer etc.) segmentation in pit shaft, can only segmentation in pit shaft, and pit shaft still is communicated with outward, can not really realize horizontal well in segments; In addition, pit shaft safety in the water plugging of horizontal well construction and oil reservoir safety are difficult to guarantee that existing well workover technology is difficult to horizontal segment is repaired.For example, the Liaohe Oil Field horizontal well completion is based on the bore hole sieve tube completion, account for 93.8% of completion sum, the sieve tube completion water blockoff is the most difficult, because do not have barrier between screen casing and the rock wall, fluid can be radially and lateral flow, will realize that the difficulty of layering, segmentation water blockoff is very big in practice, also do not have a kind of method can realize the horizontal well in segments water blockoff of sieve tube completion at present.And horizontal well goes out water problems and has become one of principal contradiction that the restriction horizontal well produces.In a word, the water plugging of horizontal well technology lacks effective blocking agent product and injection technology at present.
Summary of the invention
The object of the present invention is to provide a kind of process of water plugging of horizontal well, solve the particularly difficult problem of the horizontal well in segments water blockoff of sieve tube completion of horizontal well.
The present invention mainly is packing, stifled, the oil layer protection effect temporarily that utilizes liquid bridging plug, with horizontal well in segments, carries out pilot production and finds out the water outlet position, injects water shutoff agent to water exit interval then, realizes the segmentation water blockoff.Particularly, the invention provides a kind of horizontal well liquid bridging plug segmentation shutoff method, the method comprising the steps of:
(1), with under the oil pipe in horizontal well tiptoe position, inject the liquid bridging plug solution for preparing with the method just replaced to horizontal well, be full of the horizontal segment of pit shaft;
(2), on carry oil pipe, the oil pipe port position is set in the well water position, water displacement liquid bridging plug makes part well section be filled by water; This part well section is the target well section of water blockoff;
(3), wait to coagulate, make liquid bridging plug become gelinite, the well section of pit shaft horizontal segment except water blockoff target well section filled, finish the protection process of blocking up temporarily;
(4), utilize former tubing string to inject blocking agent, make target well section by effectively shutoff, and protected well section does not have blocking agent and injects;
(5), utilize former tubing string to inject small amount of steam or gel breaker, make the thoroughly broken glue of liquid bridging plug gelinite, become the low viscosity aqueous solution, at last operating tool string is proposed, finish whole plug water construction process.
In the method for the present invention, materials such as liquid bridging plug (liquid gum plug), water shutoff agent, gel breaker have been used.
According to specific embodiments of the present invention, among the present invention, described liquid bridging plug (liquid gum plug) comprises acrylamide monomer and initiator ammonium persulfate, can form viscoelastic gelinite through behind the 24h at a certain temperature.Has very strong plugging action.Wherein, acrylamide monomer concentration is 4%～10% (mass concentration, except that indicating especially, percentage concentration is mass concentration described in the present invention), and ammonium persulfate concentration is 0.01%～0.03%.
According to specific embodiments of the present invention, in the method for the present invention, described liquid bridging plug also comprises polyacrylamide (molecular weight 1,000 ten thousand～2,400 ten thousand).Preferably, the amount of described polyacrylamide is 0.5%～2% of a liquid bridging plug quality.The polyacrylamide of adding 0.5%～2% can be adjusted density, the viscosity of liquid bridging plug, can improve system viscosity and anti-leakage ability.
According to specific embodiments of the present invention, in the method for the present invention, described liquid bridging plug also comprises potassium chloride and/or sodium chloride.Add potassium chloride, sodium chloride, liquid bridging plug and formation water density are consistent, prevent liquid bridging plug layering, migration.Preferably, the consumption of described sodium chloride, potassium chloride is controlled at 1%～5% of liquid bridging plug gross weight.
According to specific embodiments of the present invention, also comprise the water of surplus in the described liquid bridging plug, each component sum is 100%.
According to specific embodiments of the present invention, aforesaid liquid bridging plug system is prepared in accordance with the following methods and is obtained: load weighted polyacrylamide and acrylamide monomer under stirring, are slowly added in the entry, continue to stir 30～60min; Add an amount of ammonium persulfate, stir 5～10min; Add an amount of sodium chloride and/or potassium chloride at last and regulate density.
According to specific embodiments of the present invention, in the method for the present invention, described water shutoff agent can be one or more in the organogel water shutoff agent that is selected from routine, inorganic water shutoff agent, the particle blocking agent etc.The water shutoff agent purpose is to stop up the stratum exhalant canal, reduces the invalid aquifer yield of oil well.
According to specific embodiments of the present invention, in the method for the present invention, described gel breaker is oxidants such as ammonium persulfate, hydrogen peroxide or potassium permanganate (can be mixed with the certain density aqueous solution and inject the stratum), behind the injection stratum, make the oxidized degraded of liquid bridging plug, become the low viscous aqueous solution.According to the well segment length, gel breaker consumption 30～50m
3Etc., the concentration of oxidant is not generally 2%～5%.
Because it is stifled temporarily that process of the present invention can be implemented in the interior optional position of horizontal well, thereby reach the purpose of segmentation water blockoff, also can be applicable to the water plugging of horizontal well of sieve tube completion.
In sum, the present invention has proposed in the water plugging of horizontal well process first, utilizes liquid bridging plug to carry out segmentation, the one-tenth glue of utilization liquid bridging plug, broken glue characteristic, by means such as location injection, quantitative injections, realize optional position segmentation in the horizontal well, thereby realize the horizontal well in segments water blockoff.This process is specially adapted to the water plugging of horizontal well of sieve tube completion, and this class horizontal well is difficult to carry out the segmentation water blockoff usually.The present invention uses liquid bridging plug to divide segment process, in the horizontal well tube of sieve tube completion, tube exterior subsection, has realized that the segmentation of water shutoff agent is injected; Utilize the temporarily stifled performance of liquid bridging plug, in the water blockoff process, realized oil layer protection, greatly reduce construction risk.The present invention also further adjusts prescription, the compound method of liquid bridging plug, enables to satisfy better the environment for use of horizontal well.
Description of drawings
Fig. 1 is a liquid bridging plug injection string structural representation.
Fig. 2 is the casing programme schematic diagram that utilizes after the liquid bridging plug segmentation.
The specific embodiment
Below describe technology of the present invention and characteristics in detail by specific embodiment, but these embodiment are not in order to limit protection scope of the present invention.
Embodiment 1
The horizontal well liquid bridging plug segmentation shutoff method of present embodiment comprises step:
1. operating tool string is arrived horizontal well tiptoe position (see figure 1) down, open sleeve gate, just for about 8.2 tons of liquid bridging plugs, more just for 6m
3Clear water.Liquid bridging plug consists of acrylamide monomer 650Kg, initiator ammonium persulfate 1.6Kg, polyacrylamide 80Kg (molecular weight 1,200 ten thousand), sodium chloride 100Kg, water 7390Kg.This liquid bridging plug system is to prepare in accordance with the following methods: load weighted polyacrylamide and acrylamide monomer under stirring, are slowly added in the entry, continue to stir 40min; Add ammonium persulfate, stir 10min; Add sodium chloride at last and regulate density.
2. operating tool string is mentioned wet well fragment position (2020m), just for clear water 1.2m
3, wait and coagulate 24h;
Above-mentioned steps makes 2020-2110m well section and 1960 above well sections be protected by liquid bridging plug, the 1960-2020m well section (see figure 2) that comes out.
3. keep former tubing string position, water shutoff agent 820m is just being annotated in beginning
3, water shutoff agent is the heatproof inorganic gel, it consists of water glass 400t, crosslinking agent 50t, water 450t.
4. after having annotated water shutoff agent, closing well is waited and is coagulated 48h.
5. steam injection, liquid bridging plug natural degradation in the steam injection process, producing well section de-preservation.
Embodiment 2
The horizontal well liquid bridging plug segmentation shutoff method of present embodiment comprises step:
1, operating tool string is arrived horizontal well tiptoe position (2110m) down, open sleeve gate, just for about 5.2 tons of liquid bridging plugs, followed by replacing 6m
3Clear water; Liquid bridging plug consists of acrylamide monomer 460Kg, initiator ammonium persulfate 1.0Kg, polyacrylamide 60Kg (molecular weight 2,200 ten thousand), sodium chloride 100Kg, water 4580Kg.The liquid bridging plug system is to prepare in accordance with the following methods: load weighted polyacrylamide and acrylamide monomer under stirring, are slowly added in the entry, continue to stir 30min; Add ammonium persulfate, stir 5min; Add sodium chloride at last and regulate density.
2, annotated liquid bridging plug after, operating tool string is mentioned (1700m) more than the hitch point, close sleeve gate, wait and coagulate 24h;
Above-mentioned steps makes 1920-2110 well section be protected by liquid bridging plug.
3, water shutoff agent 520m is just being annotated in beginning
3Water shutoff agent is the heatproof inorganic gel, and it consists of water glass 280t, crosslinking agent 30t, water 280t.
4, annotated water shutoff agent after, closing well wait to coagulate 48h.
5, operating tool string, following steam injection string, steam injection production, liquid bridging plug natural degradation in the steam injection process are proposed.
Claims (6)
1. horizontal well liquid bridging plug segmentation shutoff method, the method comprising the steps of:
(1), with under the oil pipe in horizontal well tiptoe position, inject the liquid bridging plug solution for preparing with the method just replaced to horizontal well, be full of the horizontal segment of pit shaft;
(2), on carry oil pipe, the oil pipe port position is set in the well water position, water displacement liquid bridging plug makes part well section be filled by water; This part well section is the target well section of water blockoff;
(3), wait to coagulate, make liquid bridging plug become gelinite, the well section of pit shaft horizontal segment except water blockoff target well section filled, finish the protection process of blocking up temporarily;
(4), utilize former tubing string to inject blocking agent, make target well section by effectively shutoff, and protected well section does not have blocking agent and injects;
(5), utilize former tubing string to inject small amount of steam or gel breaker, make the thoroughly broken glue of liquid bridging plug gelinite, become the low viscosity aqueous solution, at last operating tool string is proposed, finish whole plug water construction process.
2. method according to claim 1, wherein, described liquid bridging plug comprises acrylamide monomer and initiator ammonium persulfate, can form viscoelastic gelinite through behind the 24h at a certain temperature.
3. method according to claim 2, wherein, described liquid bridging plug also comprises polyacrylamide.
4. according to claim 2 or 3 described methods, wherein, described liquid bridging plug also comprises potassium chloride and/or sodium chloride.
5. method according to claim 1, wherein, described blocking agent is selected from one or more in organogel water shutoff agent, inorganic water shutoff agent, the particle blocking agent.
6. method according to claim 1, wherein, described gel breaker is ammonium persulfate, hydrogen peroxide or potassium permanganate.
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| CN2011100783313A CN102182421A (en) | 2011-03-30 | 2011-03-30 | Segmented water plugging method of liquid bridge plug of horizontal well |
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| CN2011100783313A CN102182421A (en) | 2011-03-30 | 2011-03-30 | Segmented water plugging method of liquid bridge plug of horizontal well |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103361039A (en) * | 2013-08-02 | 2013-10-23 | 中国石油集团川庆钻探工程有限公司 | Blocking method adopting fluid gel for producing blocking valve by formation temperature to block gas reservoir |
| CN103527161A (en) * | 2012-07-03 | 2014-01-22 | 中国石油化工股份有限公司 | Thermal recovery horizontal well water shut-off and profile control method |
| CN105525890A (en) * | 2015-11-24 | 2016-04-27 | 中国石油化工股份有限公司 | Water plugging method used for screen pipe completion horizontal well |
| CN107664020A (en) * | 2016-07-28 | 2018-02-06 | 中国石油化工股份有限公司 | The method of horizontal well with bottom water reservoir water blockoff |
| CN108547591A (en) * | 2018-02-13 | 2018-09-18 | 中国石油天然气股份有限公司 | A kind of sieve tube completion thick oil horizontal well shutoff method |
| CN109444339A (en) * | 2018-12-06 | 2019-03-08 | 西南石油大学 | A kind of shale gas horizontal well refracturing fiber temporarily blocks up experimental test procedures |
| CN109915069A (en) * | 2019-03-21 | 2019-06-21 | 新疆中凌工程技术有限公司 | A kind of weak consolidation oil-sand reservoir dilatation high temperature plugging structure and its method for blocking |
| CN113788915A (en) * | 2021-09-11 | 2021-12-14 | 岭南师范学院 | Geothermal well degradable rubber plug liquid and method for sealing layer by utilizing degradable rubber plug liquid |
| CN114456572A (en) * | 2020-10-22 | 2022-05-10 | 中国石油化工股份有限公司 | Water-soluble composite rubber material and preparation method and application thereof |
| CN114482912A (en) * | 2020-10-26 | 2022-05-13 | 中国石油化工股份有限公司 | Horizontal well water shutoff agent injection process control method |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103527161A (en) * | 2012-07-03 | 2014-01-22 | 中国石油化工股份有限公司 | Thermal recovery horizontal well water shut-off and profile control method |
| CN103361039B (en) * | 2013-08-02 | 2016-06-29 | 中国石油集团川庆钻探工程有限公司 | Formation temperature is utilized to generate the method for blocking that pack-off valve blocks the fluid gel of gas-bearing formation |
| CN103361039A (en) * | 2013-08-02 | 2013-10-23 | 中国石油集团川庆钻探工程有限公司 | Blocking method adopting fluid gel for producing blocking valve by formation temperature to block gas reservoir |
| CN105525890B (en) * | 2015-11-24 | 2019-01-08 | 中国石油化工股份有限公司 | Method for sieve tube completion water plugging of horizontal well |
| CN105525890A (en) * | 2015-11-24 | 2016-04-27 | 中国石油化工股份有限公司 | Water plugging method used for screen pipe completion horizontal well |
| CN107664020A (en) * | 2016-07-28 | 2018-02-06 | 中国石油化工股份有限公司 | The method of horizontal well with bottom water reservoir water blockoff |
| CN107664020B (en) * | 2016-07-28 | 2020-02-04 | 中国石油化工股份有限公司 | Water plugging method for bottom water reservoir horizontal well |
| CN108547591A (en) * | 2018-02-13 | 2018-09-18 | 中国石油天然气股份有限公司 | A kind of sieve tube completion thick oil horizontal well shutoff method |
| CN109444339A (en) * | 2018-12-06 | 2019-03-08 | 西南石油大学 | A kind of shale gas horizontal well refracturing fiber temporarily blocks up experimental test procedures |
| CN109915069A (en) * | 2019-03-21 | 2019-06-21 | 新疆中凌工程技术有限公司 | A kind of weak consolidation oil-sand reservoir dilatation high temperature plugging structure and its method for blocking |
| CN114456572A (en) * | 2020-10-22 | 2022-05-10 | 中国石油化工股份有限公司 | Water-soluble composite rubber material and preparation method and application thereof |
| CN114456572B (en) * | 2020-10-22 | 2023-07-25 | 中国石油化工股份有限公司 | Water-soluble composite rubber material and preparation method and application thereof |
| CN114482912A (en) * | 2020-10-26 | 2022-05-13 | 中国石油化工股份有限公司 | Horizontal well water shutoff agent injection process control method |
| CN113788915A (en) * | 2021-09-11 | 2021-12-14 | 岭南师范学院 | Geothermal well degradable rubber plug liquid and method for sealing layer by utilizing degradable rubber plug liquid |
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Application publication date: 20110914 |