CN103421479B - Horizontal cementing anti-blockage fluid and preparation method thereof - Google Patents
Horizontal cementing anti-blockage fluid and preparation method thereof Download PDFInfo
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- CN103421479B CN103421479B CN201310351101.9A CN201310351101A CN103421479B CN 103421479 B CN103421479 B CN 103421479B CN 201310351101 A CN201310351101 A CN 201310351101A CN 103421479 B CN103421479 B CN 103421479B
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Abstract
The invention discloses a kind of horizontal cementing anti-blockage fluid and preparation method thereof.Horizontal cementing anti-blockage fluid comprises the component of following weight percent: low polymerization degree Mierocrystalline cellulose 3-5%, fluid loss agent 2-4%, slowly-releasing treatment agent 4-6%, particle dispersants 0.5-1%, and surplus is water.After well cementation anti-blockage fluid of the present invention mainly solves plug uneven wear, grout is trapped in sleeve pipe, causes the technical problem not detecting the end; On-the-spot easily configuration, and good flowing properties, suspend and disperse cement particles ability strong; Cement can be stoped because of deposition blocking sleeve pipe inner gateway; Save the operational procedure that plug is bored in little drilling tool drifting.
Description
Technical field
The present invention relates to oil field drilling Well Completion Engineering of Oil Reservoirs technical field, particularly relate to horizontal cementing site operation, for the horizontal cementing anti-blockage fluid preventing cement from depositing blocking channel.
Background technology
Along with going deep into of the exploitation to poor efficiency hydrocarbon-bearing pool, the recovery ratio of straight well, orientation well can not meet the demand of society to the energy.Horizontal well drilling is able to apply on a large scale at each elephant; Changqing oilfields belongs to above-mentioned " three is low " oil-gas field, and along with the continuous progress of equipment and drilling technique, horizontal well drilling is in crossing over increasing trend in recent years.Before 2010, this block development level well amounts to less than 50 mouthfuls, and within 2010 to 2012, modern horizontal well quantity reaches more than 300 mouths, has increased substantially the recovery ratio of oil, gas; Thereupon propose new technical problem to cementing operation, horizontal well casing pipe flexural deformation, replace not clean water mud when well cementation has been executed and remain in sleeve pipe, accumulated plugging passage, causes well logging not detect the end, and how next little drilling tool carries out drifting or bore plug process.
Cause cement plug to be trapped in sleeve pipe and have multiple factors, be roughly divided into the following aspects:
, there is grout and alter groove in 1, serious wear in plug operational process;
2, plug unbalance stress one, causes monolateral replacement, causes grout to be detained;
3, plug quality problems, may exist not wear-resisting, not withstand voltage, heat-resisting property is poor, causes grout clean by replacement.
The technology of domestic anti-blockage fluid of also not cementing the well at present.In addition, a kind of rubber plug system for horizontal well drilling liner cementing is disclosed in China Patent No. " CN200810056050.6 ", publication date is on 07 15th, 2009, it comprises plug assembly and the seat that builds the pressure, plug assembly comprises closes plug and bottom plug with the tail pipe that pin mode is connected, and tail pipe is closed plug and is connected with tail pipe running tool pipe core with adapter sleeve by joint.Be provided with device of blocking in bottom plug endoporus, pitching, build-up pressure, implementing suspending device seat extension can be caught; Depart from tail pipe afterwards and close plug, by two-stage cementing tool inner sleeve, arrive build the pressure seat the lock sealing that are positioned at casing coupling above screen casing, to implement setting and to open two-stage cementing tool; Tail pipe close plug can with drilling rod plug lock sealing, build-up pressure, off center is managed, and replaces grout in tail pipe, and forever closes two-stage cementing tool circulation pore.But this technology can not fundamentally solve the problem, after still there is plug uneven wear, grout is trapped in sleeve pipe, causes the technical problem not detecting the end.
Summary of the invention
The object of the invention is to overcome the problems referred to above existed in the well cementation of existing level well, a kind of horizontal cementing anti-blockage fluid and preparation method thereof is provided.The present invention can make the cement granules be trapped in pipe suspend, and hinders grout formation of deposits Behavior of Hardened Cement Paste, guarantees sleeve pipe inner gateway.
For achieving the above object, the technical solution used in the present invention is as follows:
A kind of horizontal cementing anti-blockage fluid, is characterized in that, comprise the component of following weight percent:
Low polymerization degree Mierocrystalline cellulose 3-5%,
Fluid loss agent 2-4%,
Slowly-releasing treatment agent 4-6%,
Particle dispersants 0.5-1%,
Surplus is water.
The cellulosic polymerization degree n scope of described low polymerization degree is between 60-80.
Described low polymerization degree Mierocrystalline cellulose can be Walocel MT 20.000PV or Polyanionic Cellulose.
Described fluid loss agent can be semi-annular jade pendant sylvan urea formaldehyde or AMPS polymkeric substance.
Described slowly-releasing treatment agent can be EDTA, and its EDTA chemical formula is [C
10h
16n
2o
8]; Or 2-hydroxyethylidene diphosphonic acid guanidine-acetic acid.
Described particle dispersants can be oil well cement dispersant USZ or ethylene glycol.
A preparation method for horizontal cementing anti-blockage fluid, is characterized in that: low polymerization degree Mierocrystalline cellulose first dissolves in water by component by weight percentage, stirs and makes it be uniformly dissolved, abundant aquation after placing 20-40min; Add fluid loss agent, slowly-releasing treatment agent and particle dispersants in aqueous successively again, stir 15-30 minutes, obtained horizontal cementing anti-blockage fluid.
The density of described horizontal cementing anti-blockage fluid is 1.15 ± 0.02g/cm
3.
Employing the invention has the advantages that:
One, the on-the-spot easily configuration of the present invention, and good flowing properties, suspend and disperse cement particles ability strong; Cement can be stoped because of deposition blocking sleeve pipe inner gateway; Save the operational procedure that plug is bored in little drilling tool drifting; After mainly solving plug uneven wear, grout is trapped in sleeve pipe, causes the technical problem not detecting the end.
Two, after adopting the present invention, after grout infusion terminates, during replacement, plug heel enters the anti-blockage fluid of horizontal section pipe internal volume half, when groove altered by plug wearing and tearing, unbalance stress generation grout; Cement is stranded in sleeve pipe, anti-blockage fluid system plays and suspends and disperse cement particles, effectively prevents cement granules from assembling deposition, stops hydrated reaction of cement to form Behavior of Hardened Cement Paste, therefore can guarantee sleeve pipe inner gateway, carry out drifting without the need to many next little drilling tools or bore plug process.
Embodiment
Embodiment 1
A kind of horizontal cementing anti-blockage fluid, comprises the component of following weight percent:
Low polymerization degree Mierocrystalline cellulose 3%,
Fluid loss agent 2%,
Slowly-releasing treatment agent 4%,
Particle dispersants 0.5%,
Surplus is water.
In the present invention, the cellulosic polymerization degree n scope of described low polymerization degree is between 60-80.
In the present invention, described low polymerization degree Mierocrystalline cellulose can be Walocel MT 20.000PV or Polyanionic Cellulose, but is not limited thereto.
In the present invention, described fluid loss agent can be semi-annular jade pendant sylvan urea formaldehyde or AMPS polymkeric substance, but is not limited thereto.
In the present invention, described slowly-releasing treatment agent can be EDTA, and its EDTA chemical formula is [C
10h
16n
2o
8]; Also can be 2-hydroxyethylidene diphosphonic acid guanidine-acetic acid, but be not limited thereto.
In the present invention, described particle dispersants is oil well cement dispersant USZ, but and be confined to oil well cement dispersant USZ, also can adopt other dispersion agent existing such as ethylene glycol.
A preparation method for horizontal cementing anti-blockage fluid, comprising: low polymerization degree Mierocrystalline cellulose first dissolves in water by component by weight percentage, stirs and makes it be uniformly dissolved, abundant aquation after placing 20min; Add fluid loss agent, slowly-releasing treatment agent and particle dispersants in aqueous successively again, stir 15 minutes, obtained horizontal cementing anti-blockage fluid.
In the present invention, the density of described horizontal cementing anti-blockage fluid is 1.15 ± 0.02g/cm
3.
Embodiment 2
A kind of horizontal cementing anti-blockage fluid, is characterized in that, comprise the component of following weight percent:
Low polymerization degree Mierocrystalline cellulose 5%,
Fluid loss agent 4%,
Slowly-releasing treatment agent 6%,
Particle dispersants 1%,
Surplus is water.
A preparation method for horizontal cementing anti-blockage fluid, comprising: low polymerization degree Mierocrystalline cellulose first dissolves in water by component by weight percentage, stirs and makes it be uniformly dissolved, abundant aquation after placing 40min; Add fluid loss agent, slowly-releasing treatment agent and particle dispersants in aqueous successively again, stir 30 minutes, obtained horizontal cementing anti-blockage fluid.
Embodiment 3
A kind of horizontal cementing anti-blockage fluid, is characterized in that, comprise the component of following weight percent:
Low polymerization degree Mierocrystalline cellulose 4%,
Fluid loss agent 3%,
Slowly-releasing treatment agent 5%,
Particle dispersants 0.8%,
Surplus is water.
A preparation method for horizontal cementing anti-blockage fluid, comprising: low polymerization degree Mierocrystalline cellulose first dissolves in water by component by weight percentage, stirs and makes it be uniformly dissolved, abundant aquation after placing 30min; Add fluid loss agent, slowly-releasing treatment agent and particle dispersants in aqueous successively again, stir 20 minutes, obtained horizontal cementing anti-blockage fluid.
Embodiment 4
First prepare low polymerization degree cellulose aqueous solution, component first takes 5g low polymerization degree Mierocrystalline cellulose and dissolves in 85g water by weight percentage, fully stirs and makes it be sufficiently uniformly dissolved, and to place after 30min fully aquation; Take 3g fluid loss agent, 5g slowly-releasing treatment agent EDTA, 1g particle dispersants more successively, pour in the solvent aqueous solution, continue stirring 20 minutes, gained liquid mixture is horizontal cementing anti-blockage fluid.The horizontal cementing anti-blockage fluid density obtained is 1.15g/cm
3.
Test according to the different ratios of cement and anti-blockage fluid weight ratio, its main performance testing results is as shown in table 1:
Table 1 cement and anti-blockage fluid different ratio performance synopsis
Claims (3)
1. a horizontal cementing anti-blockage fluid, is characterized in that, comprises the component of following weight percent:
Low polymerization degree Mierocrystalline cellulose 3-5%,
Fluid loss agent 2-4%,
Slowly-releasing treatment agent 4-6%,
Particle dispersants 0.5-1%,
Surplus is water;
The cellulosic polymerization degree n scope of described low polymerization degree is between 60-80;
Described low polymerization degree Mierocrystalline cellulose is Walocel MT 20.000PV or Polyanionic Cellulose; Described fluid loss agent is sulfonated-pheno-formoldehyde resin or AMPS polymkeric substance; Described slowly-releasing treatment agent is EDTA, and its EDTA chemical formula is [C
10h
16n
2o
8]; Or 2-hydroxyethylidene diphosphonic acid guanidine-acetic acid; Described particle dispersants is oil well cement dispersant or ethylene glycol.
2. the preparation method of a kind of horizontal cementing anti-blockage fluid according to claim 1, is characterized in that: low polymerization degree Mierocrystalline cellulose first dissolves in water by component by weight percentage, stirs and makes it be uniformly dissolved, abundant aquation after placing 20-40min; Add fluid loss agent, slowly-releasing treatment agent and particle dispersants in aqueous successively again, stir 15-30 minutes, obtained horizontal cementing anti-blockage fluid.
3. the preparation method of a kind of horizontal cementing anti-blockage fluid according to claim 2, is characterized in that: the density of described horizontal cementing anti-blockage fluid is 1.15 ± 0.02g/cm
3.
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| US6209646B1 (en) * | 1999-04-21 | 2001-04-03 | Halliburton Energy Services, Inc. | Controlling the release of chemical additives in well treating fluids |
| WO2006054058A1 (en) * | 2004-11-17 | 2006-05-26 | Halliburton Energy Services, Inc. | Methods of degrading filter cakes in subterranean formations |
| CN101157533A (en) * | 2007-09-06 | 2008-04-09 | 中国石油大学(华东) | Biological degradable oil well cement fluid loss additive and preparation method thereof |
| CN102585790A (en) * | 2011-12-16 | 2012-07-18 | 中国石油大学(华东) | Cement slurry system suitable for long cementing section well cementing job |
| CN102827593A (en) * | 2012-09-14 | 2012-12-19 | 中国石油大学(华东) | Deep-water well cementation cement paste system activated based on slag |
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2013
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| US6209646B1 (en) * | 1999-04-21 | 2001-04-03 | Halliburton Energy Services, Inc. | Controlling the release of chemical additives in well treating fluids |
| CN1288035A (en) * | 2000-04-07 | 2001-03-21 | 西南石油学院 | Agent for anti gassing-out in well cementing slurry and its prepn. method |
| WO2006054058A1 (en) * | 2004-11-17 | 2006-05-26 | Halliburton Energy Services, Inc. | Methods of degrading filter cakes in subterranean formations |
| CN101157533A (en) * | 2007-09-06 | 2008-04-09 | 中国石油大学(华东) | Biological degradable oil well cement fluid loss additive and preparation method thereof |
| CN102585790A (en) * | 2011-12-16 | 2012-07-18 | 中国石油大学(华东) | Cement slurry system suitable for long cementing section well cementing job |
| CN102827593A (en) * | 2012-09-14 | 2012-12-19 | 中国石油大学(华东) | Deep-water well cementation cement paste system activated based on slag |
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| 国内外高温高压井固井用外加剂现状及进展;武世新;《延安职业技术学院学报》;20111031;第25卷(第05期);77-79 * |
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Effective date of registration: 20201029 Address after: 100007 Dongcheng District, Dongzhimen, China, North Street, No. 9 Oil Mansion, No. Patentee after: CHINA NATIONAL PETROLEUM Corp. Patentee after: CNPC Chuanqing Drilling Engineering Co.,Ltd. Address before: The 1 section of No. 3 company Chuanqing Drilling Technology Information Office Chenghua District Green Road 610051 Chengdu City, Sichuan Province Patentee before: CNPC Chuanqing Drilling Engineering Co.,Ltd. |