CN103421479A - Cementing and anti-blockage fluid for horizontal wells and method for manufacturing cementing and anti-blockage fluid - Google Patents
Cementing and anti-blockage fluid for horizontal wells and method for manufacturing cementing and anti-blockage fluid Download PDFInfo
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- CN103421479A CN103421479A CN2013103511019A CN201310351101A CN103421479A CN 103421479 A CN103421479 A CN 103421479A CN 2013103511019 A CN2013103511019 A CN 2013103511019A CN 201310351101 A CN201310351101 A CN 201310351101A CN 103421479 A CN103421479 A CN 103421479A
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Abstract
The invention discloses cementing and anti-blockage fluid for horizontal wells and a method for manufacturing the cementing and anti-blockage fluid. The cementing and anti-blockage fluid comprises, by weight, 3-5% of low-polymerization-degree celluloses, 2-4% of filtrate loss reducers, 4-6% of sustained release treating agents, 0.5-1% of particle dispersing agents and the balance water. The cementing and anti-blockage fluid and the method have the advantages that the cementing and anti-blockage fluid mainly solves technical problems that cement slurry is retained in a casing after a single side of a rubber plug is abraded and the bottom of a well cannot be measured; the cementing and anti-blockage fluid is easy to prepared in a field and is good in flowing property and high in cement particle suspending and dispersing capacity; deposited cement can be stopped from blocking a channel in a casing; a construction procedure for drifting and drilling a plug by the aid of a small drilling tool can be omitted.
Description
Technical field
The present invention relates to oil field drilling Well Completion Engineering of Oil Reservoirs technical field, particularly relate to the horizontal cementing site operation, for preventing the antifouling liquid of horizontal cementing of cement deposition 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; Long celebrating oil field belongs to above-mentioned " three is low " oil-gas field, and along with the continuous progress of equipment and drilling technique, horizontal well drilling was to cross over and increases progressively trend in recent years.Before 2010, this block development level well amounts to 50 mouthfuls of less thaies, and within 2010 to 2012, modern horizontal well quantity reaches more than 300 mouthfuls, has increased substantially recovery ratio oily, gas; Thereupon cementing operation has been proposed to new technical problem, horizontal well casing pipe flexural deformation, well cementation replaces not clean water mud while having executed and remains in sleeve pipe, piles up blocking channel, causes and does not detect the end, and how next little drilling tool carries out drifting or bores plug and process.
Cause that cement plug is trapped in sleeve pipe multiple factors is arranged, and roughly is divided into the following aspects:
Grout, occur and alter groove in 1, serious wear in the plug operational process;
2, the 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 to be replaced clean.
The technology of the current domestic antifouling liquid of also not cementing the well.In addition, a kind of rubber plug system for the horizontal well drilling liner cementing is disclosed in China Patent No. " CN200810056050.6 ", open day is on 07 15th, 2009, it comprises the plug assembly and the seat that builds the pressure, the plug assembly comprises that the tail pipe connected in the pin mode close plug and bottom plug, and tail pipe is closed plug and is connected with tail pipe running tool pipe core with adapter sleeve by joint.Be provided with the device of blocking in the bottom plug endoporus, can catch pitching, build-up pressure, implementing suspending device seat extension; Break away from afterwards tail pipe and close plug, by the two-stage cementing tool inner sleeve, arrive the also lock sealing of seat that builds the pressure of the casing coupling be positioned at 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 pipe, replace grout in tail pipe, and forever close the two-stage cementing tool circulation pore.But this technology can not fundamentally address the above problem, still have the plug uneven wear after grout be trapped in sleeve pipe, cause the technical problem that does not detect the end.
Summary of the invention
The object of the invention is to overcome the problems referred to above that exist in the well cementation of existing level well, antifouling liquid of a kind of horizontal cementing and preparation method thereof is provided.The cement granules that the present invention can make to be trapped in pipe suspends, and hinders grout formation of deposits Behavior of Hardened Cement Paste, guarantees the sleeve pipe inner gateway.
For achieving the above object, the technical solution used in the present invention is as follows:
The antifouling liquid of a kind of horizontal cementing, 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 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.
The preparation method of the antifouling liquid of a kind of horizontal cementing is characterized in that: component is first dissolved in the low polymerization degree Mierocrystalline cellulose in water by weight percentage, stirs it is uniformly dissolved, and places after 20-40min fully aquation; Add successively again fluid loss agent, slowly-releasing treatment agent and particle dispersants in the aqueous solution, stir 15-30 minutes, make the antifouling liquid of horizontal cementing.
The density of the antifouling liquid of described horizontal cementing 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 the cement granules ability strong; Can stop cement to stop up the sleeve pipe inner gateway because of deposition; Save the operational procedure that plug is bored in the drifting of bradawl tool; After mainly solving the plug uneven wear, grout is trapped in sleeve pipe, causes the technical problem that does not detect the end.
Two,, after adopting the present invention, after the grout infusion finishes, during replacement, the plug heel enters half antifouling liquid of horizontal section pipe internal volume, when plug wearing and tearing, unbalance stress generation grout are altered groove; Cement is stranded in sleeve pipe, antifouling liquid system plays and suspends and disperse cement granules, effectively prevents cement granules gathering deposition, stops hydrated reaction of cement to form Behavior of Hardened Cement Paste, therefore can guarantee the sleeve pipe inner gateway, without many next little drilling tools, carry out drifting or bore plug and process.
Embodiment
Embodiment 1
The antifouling liquid of a kind of horizontal cementing 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 for being Walocel MT 20.000PV or Polyanionic Cellulose, but be not limited to this.
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 to this.
In the present invention, described slowly-releasing treatment agent can be EDTA, and its EDTA chemical formula is [C
10H
16N
2O
8]; Can be also 2-hydroxyethylidene diphosphonic acid guanidine-acetic acid, but be not limited to this.
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 existing other dispersion agent such as ethylene glycol.
The preparation method of the antifouling liquid of a kind of horizontal cementing comprises: component is first dissolved in the low polymerization degree Mierocrystalline cellulose in water by weight percentage, stirs it is uniformly dissolved, abundant aquation after placement 20min; Add successively again fluid loss agent, slowly-releasing treatment agent and particle dispersants in the aqueous solution, stir 15 minutes, make the antifouling liquid of horizontal cementing.
In the present invention, the density of the antifouling liquid of described horizontal cementing is 1.15 ± 0.02g/cm
3.
Embodiment 2
The antifouling liquid of a kind of horizontal cementing, is characterized in that, comprises 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.
The preparation method of the antifouling liquid of a kind of horizontal cementing comprises: component is first dissolved in the low polymerization degree Mierocrystalline cellulose in water by weight percentage, stirs it is uniformly dissolved, abundant aquation after placement 40min; Add successively again fluid loss agent, slowly-releasing treatment agent and particle dispersants in the aqueous solution, stir 30 minutes, make the antifouling liquid of horizontal cementing.
Embodiment 3
The antifouling liquid of a kind of horizontal cementing, is characterized in that, comprises 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.
The preparation method of the antifouling liquid of a kind of horizontal cementing comprises: component is first dissolved in the low polymerization degree Mierocrystalline cellulose in water by weight percentage, stirs it is uniformly dissolved, abundant aquation after placement 30min; Add successively again fluid loss agent, slowly-releasing treatment agent and particle dispersants in the aqueous solution, stir 20 minutes, make the antifouling liquid of horizontal cementing.
Embodiment 4
At first prepare the 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 it is sufficiently uniformly dissolved, and places after 30min fully aquation; Take successively 3g fluid loss agent, 5g slowly-releasing treatment agent EDTA, 1g particle dispersants again, pour in the solvent aqueous solution, continue to stir 20 minutes, the gained liquid mixture is the antifouling liquid of horizontal cementing.The antifouling liquid-tight degree of the horizontal cementing obtained is 1.15g/cm
3.
Different ratios according to cement and antifouling liquid weight ratio is tested, and its main performance testing results is as shown in table 1:
Table 1 cement proportioning performance different from antifouling liquid synopsis
Claims (8)
1. the antifouling liquid of horizontal cementing, 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.
2. the antifouling liquid of a kind of horizontal cementing according to claim 1, it is characterized in that: the cellulosic polymerization degree n scope of described low polymerization degree is between 60-80.
3. the antifouling liquid of a kind of horizontal cementing according to claim 2, it is characterized in that: described low polymerization degree Mierocrystalline cellulose is Walocel MT 20.000PV or Polyanionic Cellulose.
4. according to claim 1, the antifouling liquid of 2 or 3 described a kind of horizontal cementing, it is characterized in that: described fluid loss agent is semi-annular jade pendant sylvan urea formaldehyde or AMPS polymkeric substance.
5. according to claim 1, the antifouling liquid of 2 or 3 described a kind of horizontal cementing, it is characterized in that: 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.
6. according to claim 1, the antifouling liquid of 2 or 3 described a kind of horizontal cementing, it is characterized in that: described particle dispersants is oil well cement dispersant or ethylene glycol.
7. the preparation method of the antifouling liquid of a kind of horizontal cementing according to claim 1, it is characterized in that: component is first dissolved in the low polymerization degree Mierocrystalline cellulose in water by weight percentage, stirs it is uniformly dissolved, and places after 20-40min fully aquation; Add successively again fluid loss agent, slowly-releasing treatment agent and particle dispersants in the aqueous solution, stir 15-30 minutes, make the antifouling liquid of horizontal cementing.
8. the preparation method of the antifouling liquid of a kind of horizontal cementing according to claim 7, it is characterized in that: the density of the antifouling liquid of described horizontal cementing is 1.15 ± 0.02g/cm
3.
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Cited By (1)
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| CN105036587A (en) * | 2015-09-06 | 2015-11-11 | 山东宏艺科技股份有限公司 | High-performance concrete synergist and preparing method thereof |
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| WO2006054058A1 (en) * | 2004-11-17 | 2006-05-26 | Halliburton Energy Services, Inc. | Methods of degrading filter cakes in subterranean formations |
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| CN105036587A (en) * | 2015-09-06 | 2015-11-11 | 山东宏艺科技股份有限公司 | High-performance concrete synergist and preparing method thereof |
| CN105036587B (en) * | 2015-09-06 | 2017-07-14 | 山东宏艺科技股份有限公司 | A kind of high performance concrete synergist and preparation method thereof |
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| CN103421479B (en) | 2016-02-17 |
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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. |