CN102485826B - Low temperature microbubble drilling fluid flow pattern conditioning agent and application thereof - Google Patents
Low temperature microbubble drilling fluid flow pattern conditioning agent and application thereof Download PDFInfo
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- CN102485826B CN102485826B CN201010580349.9A CN201010580349A CN102485826B CN 102485826 B CN102485826 B CN 102485826B CN 201010580349 A CN201010580349 A CN 201010580349A CN 102485826 B CN102485826 B CN 102485826B
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Abstract
The invention relates to a low temperature microbubble drilling fluid flow pattern conditioning agent and application thereof. The flow pattern conditioning agent is prepared from xanthan gum and an inorganic boron cross-linking agent, and the mass ratio of xanthan gum to the inorganic boron cross-linking agent is 1: 1 to 2: 1; the content of water-soluble substances in the flow pattern conditioning agent is no less than 90%, and water content in the flow pattern conditioning agent is no more than 15%; when an aqueous solution with a concentration of 0.5% is prepared from the flow pattern conditioning agent, the aqueous solution has a pH value of 5.0 to 7.0, an apparent viscosity of 15 to 25 mPa.s and stabilized microbubble time of no less than 24 h. When aqueous solution is used as the low temperature microbubble drilling fluid flow pattern conditioning agent, based on the weight of water in each 100 g of microbubble drilling fluid, the usage amount of the low temperature microbubble drilling fluid flow pattern conditioning agent is 0.1 to 0.4 g; the flow pattern conditioning agent has good compatibility with common drilling fluid treating agents, is applicable to an environment with a temperature less than or equal to 120 DEG C and is a low temperature microbubble drilling fluid flow pattern conditioning agent.
Description
Technical field:
The present invention relates to a kind of low-temperature micro-foam (diameter 60-70um) drilling fluid flow pattern conditioning agent and application thereof, refer to especially a kind of low temperature microbubble drilling fluid flow pattern conditioning agent that is applicable to be less than or equal in the temperature environment of 120 ℃.
Background technology:
Drilling fluid is for drilling process equilibrium strata pressure, guarantees one of indispensable material that safety is crept into smoothly.In drilling process, leakage is the reservoir pressure phenomenon that drilling fluid bleeds stratum in a large number while being less than fluid column pressure.Leakage can cause down-hole accident or complexcase, causes the engineering time to extend, and operating cost increases, and even institute's drilling well is scrapped, and then causes the serious wasting of resources and tremendous economic loss.2003, the whole world only leaking-stoppage fee was about 800,000,000 dollars, and did not comprise the input that is caused down-hole accident aftertreatment accident by leakage.Therefore, increase economic efficiency, must fundamentally control drilling fluid leakage.Yet the mankind there is no at present method and accurately find out the concrete location of formation leakage passage and size, can only make great efforts research and development lost circulation prevention and the rear efficiently plugging material on shutoff stratum of leakage in advance.
In order to prevent the drilling fluid stratum of bleeding, or successful shutoff leakage channel rapidly after leakage occurs, recover as early as possible to creep into, operator has used nearly all material, comprises rubber, cement, fiber, plastics, polymkeric substance, inorganic gel, oil-soluble resin, pitch, sticky resin, solubility in acid patching materials, macro powder fiber etc.But in these materials, some material size and shapes do not mate with formation leakage channel sized and shape, control leakage effect undesirable; Under high temperature action, intensity is low, bearing capacity is poor for some materials; Some materials cannot be in drilling well normal operation, leak stopping voluntarily after preventing leakage and running into weak zone.
For improving plugging effect, researchist starts with from rigid material, has studied the matching problem of material size with leakage channel size, has successively proposed 1/3 bridge formation rule, 2/3 bridge formation rule, pore throat network model, ideal packing theory, D
90filling rule, shield-temporary plugging fractal theory, and solid phase particles polycomponent filtration model etc., to calculating sizeable plugging material, comprehensive shutoff formation leakage passage.Yet, due to subsurface reservoir pore size, distribute very inhomogeneously, cannot utilize the material size shutoff stratum of Theoretical Calculation.Meanwhile, the shape very irregular of underground leakage channel, with the more regular material shutoff leakage channel in irregular shape of shape, effect is certainly unsatisfactory.Therefore, the leakage problem that only solved to a certain extent that above-mentioned research theory has, what have only rests on theoretical level.
In the situation that plugging effect is undesirable, low density working fluid is used to drilling operation.Microvesicle working fluid can solve the matching problem of patching materials and leakage channel size and shape.The preparation of microvesicle working fluid is safeguarded simple; in performance, microvesicle working fluid, except possessing the feature of existing conventional Water-based working liquid for electrical, also possesses the advantage of leak-proof leak-stopping; can be in drilling process leak-proof leak-stopping and protection reservoir, and have more standby density adjustable feature within the specific limits.
The molecule of this invention can form reticulated structure in mutually at micro-foam drilling fluid body, stop microvesicle body mutually in Upward Migration, microvesicle is fixed in system, prevent float the in a large number gas-liquid separation phenomenon of appearance of microvesicle.
The common drilling fluid for stabilise bubbles is mainly tackifier with treatment agent.Common tackifier only can increase system plastic viscosity, and a little less than increasing system yield value ability, in stabilising system, the key parameter of bubble is yield value.This invention can effectively improve system shear force, the microvesicle in stabilising system.
Summary of the invention:
The object of this invention is to provide a kind of low temperature microbubble drilling fluid flow pattern conditioning agent and in the application for the preparation of in low-temperature micro-foam drilling fluid, so that microvesicle stable existence is in system, prevent that the unstable situations such as micro-foam drilling fluid system layering from occurring, and plays the effect that regulates micro-foam drilling fluid flow pattern simultaneously.
A kind of low temperature microbubble drilling fluid flow pattern conditioning agent of the present invention, formulated by xanthan gum and inorganic boron crosslinking agent; Xanthan gum and the inorganic boron crosslinking agent mass ratio when preparation is 1～2: 1.
Xanthan gum described in the present invention and inorganic boron crosslinking agent be commercially available acquisition all, can select general industry product.
Low temperature microbubble drilling fluid flow pattern conditioning agent of the present invention, its water solubles content >=90%, moisture content≤15%, and the pH value that this flow pattern regulator is mixed with after 0.5% aqueous solution is 5.0～7.0, apparent viscosity 15～25mPas, microvesicle steady time >=24h.
Low temperature microbubble drilling fluid flow pattern conditioning agent of the present invention is for low-temperature micro-foam drilling fluid system feature and specialized designs is mainly used in the microvesicle in stable microbubble drilling fluid system, has the effect of the micro-foam drilling fluid of adjusting flow pattern.Flow pattern regulator of the present invention is compared with other treatment agent with similar effect in prior art, and effectively microvesicle in stable microbubble drilling fluid, prevents that the unstable situation of gas-liquid layering, system that microvesicle floating occurs from occurring.Flow pattern regulator of the present invention is good by treatment agent compatibleness with general drilling fluid, and this flow pattern regulator is nontoxic, harmless, for environment can acceptance type treatment agent.
The present invention also provides described low temperature microbubble drilling fluid flow pattern conditioning agent in the application for the preparation of in micro-foam drilling fluid.Particularly, water base in every hectogram in micro-foam drilling fluid, the consumption of described low temperature microbubble drilling fluid flow pattern conditioning agent is 0.1～0.4 gram, has advantages of that few, the steady bubble effect of consumption is strong.
The present invention also provides a kind of micro-foam drilling fluid, comprising microvesicle working fluid flow pattern regulator of the present invention.Particularly, water base in every hectogram in micro-foam drilling fluid, comprising 0.1～0.4 gram of described microvesicle working fluid flow pattern regulator, i.e. 0.1～0.4g flow pattern regulator/100g water.
Invention effect:
The invention relates to a kind of low temperature microbubble drilling fluid flow pattern conditioning agent, this low temperature microbubble drilling fluid flow pattern conditioning agent is formulated by xanthan gum and inorganic boron crosslinking agent.Microbubble drilling fluid flow pattern conditioning agent provided by the present invention, be mainly used in the microvesicle in stable microbubble drilling fluid system, there is the effect of the micro-foam drilling fluid of adjusting flow pattern, and this flow pattern regulator is good by treatment agent compatibleness with general drilling fluid, being applicable to be less than or equal to the temperature environment of 120 ℃, is a kind of low temperature microbubble drilling fluid flow pattern conditioning agent.
Embodiment
Embodiment 1
The compound method of the low temperature microbubble drilling fluid flow pattern conditioning agent of the present embodiment is as follows:
(1) xanthan gum and inorganic boron crosslinking agent are cured dry;
(2) in container, will be dried rear xanthan gum fully mixes in mass ratio with two kinds of materials of inorganic boron crosslinking agent at 1: 1.
Performance to the low temperature microbubble drilling fluid flow pattern conditioning agent of the present embodiment is tested, and specifically carries out as follows:
1pH value
Take 2.0g sample, put into volume 300mL beaker, adding distil water 200mL, stirs 30min to fully dissolving, and drips solution on pH test paper, reference standard color range reading with clean glass stick.
2 determinations of moisture
2.1 take 5.00g sample (being accurate to 0.01g), are placed in the weighing bottle that weighed quality, in drying baker, in (105 ± 3) ℃, dry 2h, are placed in moisture eliminator and are cooled to room temperature, weigh (being accurate to 0.01g).
2.2 moisture contents are calculated by formula (I):
In formula: m is sample mass, g; m
1for drying sample mass, g.
The mensuration of 3 water solubles content
3.1 get 0.2g～0.3g absorbent cotton puts into a paper roll being rolled into wiping lens paper, dries 2h standby at (105 ± 3) ℃.
3.2 take porphyrize and cross the sample 0.5g (claiming accurate to 0.1mg) of the sieve aperture length of side 0～28rnm standard sieve, put into above-mentioned paper roll Bao Yanhou and weigh, then put into the sample cup of extractor, sample cup is hung over to miniature prolong below in extractor.
3.3 inject 250mL～300mL distilled water in extractor.Extractor is put into electric mantle and heat and keep boiling state, treat that effluent liquid takes out sample cup till colourless, paper roll is placed in to lower dry case, at (105 ± 3) ℃, dry 2h, takes out and puts into moisture eliminator, after cooling 30min, weighs.
3.4 calculate water solubles content by formula (II):
In formula: W
wfor water solubles content, %; m
3for absorbent cotton, wiping lens paper and sample mass, g; m
4for absorbent cotton, wiping lens paper and residue quality, g; m
5for sample mass, g.
3.5 measure permissible error is less than 1%.
4 apparent viscosity
4.1 instrument
Adopt the Qingdao Tong Chun oil ZNN-D6 of Instrument Ltd. type rotational viscosimeter, this viscometer is to take the rotary-type instrument that electric motor is power.In the annular space of drilling fluid between two concentric drums.Urceolus (or claiming rotating cylinder) rotates with constant speed (rpm).The rotation of rotating cylinder in drilling fluid produces moment of torsion to inner core (or claiming suspending hammer), and torsion spring stops the rotation of inner core, and the displacement of the dial plate being connected with suspending hammer indication suspending hammer.
4.2 mensuration programs
Attention: instrument maximum operating temperature is 93 ℃.As measured temperature higher than the drilling fluid of 93 ℃, should use solid metal inner core or the hollow metal inner core of inner complete drying.Because in the time of in being immersed in high-temperature drilling liquid, the liquid of hollow inner core inside may evaporate and cause breaking of inner core.
4.2.1 measure and record the temperature of drilling fluid, take ℃ is unit representation.
4.2.2 use clean graduated cylinder to measure 400mL distilled water and be transferred in clean jar, add 2g flow pattern regulator in distilled water, homogenizer 5000rpm stirs 20min.
4.2.3 the sample stirring is injected in container, and makes rotating cylinder just be immersed into scale marks place.
4.2.4 open instrument, adjusting rotary speed, at 600rpm shelves, after the dial plate value of reading is constant, reads and the recording meter panel value of reading.
4.2.5 calculate
By formula (III), calculate apparent viscosity:
AV＝θ
600/2 (III)
In formula: AV is plastic viscosity, mPas; θ
600constant value of reading during for 600rpm, zero dimension.
5 microvesicle steady times
5.1 micro-foam drilling fluid base fluid preparation.In 400mL distilled water, add appropriate sodium hydroxide, regulate pH value between 10～11, then add 2g sodium carbonate, 0.4g nucleator, 0.8g membrane-forming agent.After every kind for the treatment of agent adds, under 5000rpm, stir 20min, and note scraping the treatment agent sticking on wall of container, be made into micro-foam drilling fluid base fluid.
5.2 add 1.6g flow pattern regulator in base fluid, under 5000rpm, stir 20min, and note scraping the treatment agent sticking on wall of container, are mixed with micro-foam drilling fluid, measure working fluid density.
5.3 microvesicle working fluid Stability Determination.Standing working fluid 24h, observes microvesicle working fluid stability, and measures its density.Variable density ± 0.05g/cm
3can be considered stable.
Performance by the low-temperature micro-foam drilling fluid membrane-forming agent of 1～5 pair of the present embodiment of above test procedure is tested, and acquired results is referring to table 1:
Table 1 microbubble drilling fluid flow pattern conditioning agent performance test table
| Project | Requirement | Observed value |
| PH value | 6.0～9.0 | 7.0 |
| Moisture content, % | ≤15 | 12 |
| Water solubles content, % | 90 | 95 |
| Apparent viscosity, mPas | 15～25 | 20 |
| Microvesicle steady time, h | ≥24 | 29 |
From above experimental result, can find out, the property indices of the low temperature microbubble drilling fluid flow pattern conditioning agent of the present embodiment all reaches design requirements.
Embodiment 2
The compound method of the low temperature microbubble drilling fluid flow pattern conditioning agent of the present embodiment is as follows:
(1) xanthan gum and inorganic boron crosslinking agent are cured dry;
(2) in container, will be dried rear xanthan gum fully mixes in mass ratio with two kinds of materials of inorganic boron crosslinking agent at 2: 1.
Performance to the low temperature microbubble drilling fluid flow pattern conditioning agent of the present embodiment is tested, and specifically carries out as follows:
1pH value
Take 2.0g sample, put into volume 300mL beaker, adding distil water 200mL, stirs 30min to fully dissolving, and drips solution on pH test paper, reference standard color range reading with clean glass stick.
2 determinations of moisture
2.1 take 5.00g sample (being accurate to 0.01g), are placed in the weighing bottle that weighed quality, in drying baker, in (105 ± 3) ℃, dry 2h, are placed in moisture eliminator and are cooled to room temperature, weigh (being accurate to 0.01g).
2.2 moisture contents are calculated by formula (I):
In formula: m is sample mass, g; m
1for drying sample mass, g.
The mensuration of 3 water solubles content
3.1 get 0.2g～0.3g absorbent cotton puts into a paper roll being rolled into wiping lens paper, dries 2h standby at (105 ± 3) ℃.
3.2 take porphyrize and cross the sample 0.5g (claiming accurate to 0.1mg) of the sieve aperture length of side 0～28rnm standard sieve, put into above-mentioned paper roll Bao Yanhou and weigh, then put into the sample cup of extractor, sample cup is hung over to miniature prolong below in extractor.
3.3 inject 250mL～300mL distilled water in extractor.Extractor is put into electric mantle and heat and keep boiling state, treat that effluent liquid takes out sample cup till colourless, paper roll is placed in to lower dry case, at (105 ± 3) ℃, dry 2h, takes out and puts into moisture eliminator, after cooling 30min, weighs.
3.4 calculate water solubles content by formula (II):
In formula: W
wfor water solubles content, %; m
3for absorbent cotton, wiping lens paper and sample mass, g; m
4for absorbent cotton, wiping lens paper and residue quality, g; m
5for sample mass, g.
3.5 measure permissible error is less than 1%.
4 apparent viscosity
4.1 instrument
Adopt the Qingdao Tong Chun oil ZNN-D6 of Instrument Ltd. type rotational viscosimeter, this viscometer is to take the rotary-type instrument that electric motor is power.In the annular space of drilling fluid between two concentric drums.Urceolus (or claiming rotating cylinder) rotates with constant speed (rpm).The rotation of rotating cylinder in drilling fluid produces moment of torsion to inner core (or claiming suspending hammer), and torsion spring stops the rotation of inner core, and the displacement of the dial plate being connected with suspending hammer indication suspending hammer.
4.2 mensuration programs
Attention: instrument maximum operating temperature is 93 ℃.As measured temperature higher than the drilling fluid of 93 ℃, should use solid metal inner core or the hollow metal inner core of inner complete drying.Because in the time of in being immersed in high-temperature drilling liquid, the liquid of hollow inner core inside may evaporate and cause breaking of inner core.
4.2.1 measure and record the temperature of drilling fluid, take ℃ is unit representation.
4.2.2 use clean graduated cylinder to measure 400mL distilled water and be transferred in clean jar, add 2g flow pattern regulator in distilled water, homogenizer 5000rpm stirs 20min.
4.2.3 the sample stirring is injected in container, and makes rotating cylinder just be immersed into scale marks place.
4.2.4 open instrument, adjusting rotary speed, at 600rpm shelves, after the dial plate value of reading is constant, reads and the recording meter panel value of reading.
4.2.5 calculate
By formula (III), calculate apparent viscosity:
AV＝θ
600/2 (III)
In formula: AV is plastic viscosity, mPas; θ
600constant value of reading during for 600rpm, zero dimension.
5 microvesicle steady times
5.1 micro-foam drilling fluid base fluid preparation.In 400mL distilled water, add appropriate sodium hydroxide, regulate pH value between 10～11, then add 2g sodium carbonate, 0.4g nucleator, 0.8g membrane-forming agent.After every kind for the treatment of agent adds, under 5000rpm, stir 20min, and note scraping the treatment agent sticking on wall of container, be made into micro-foam drilling fluid base fluid.
5.2 add 1.6g flow pattern regulator in base fluid, under 5000rpm, stir 20min, and note scraping the treatment agent sticking on wall of container, are mixed with micro-foam drilling fluid, measure working fluid density.
5.3 microvesicle working fluid Stability Determination.Standing working fluid 24h, observes microvesicle working fluid stability, and measures its density.Variable density ± 0.05g/cm
3can be considered stable.
Performance by the low-temperature micro-foam drilling fluid membrane-forming agent of 1～5 pair of the present embodiment of above test procedure is tested, and acquired results is referring to table 2:
Table 2 microbubble drilling fluid flow pattern conditioning agent performance test table
| Project | Requirement | Observed value |
| PH value | 6.0～9.0 | 7.0 |
| Moisture content, % | ≤15 | 11 |
| Water solubles content, % | ≥90 | 92 |
| Apparent viscosity, mPas | 15～25 | 22 |
| Microvesicle steady time, h | ≥24 | 35 |
From above experimental result, can find out, the property indices of the low temperature microbubble drilling fluid flow pattern conditioning agent of the present embodiment all reaches design requirements.
Claims (1)
1. the application of a low temperature microbubble drilling fluid flow pattern conditioning agent, it is characterized in that: be used as the low-temperature micro-foam working fluid flow pattern regulator in the temperature environment that is less than or equal to 120 ℃, water base in every hectogram in micro-foam drilling fluid, its low temperature microbubble drilling fluid flow pattern conditioning agent consumption is 0.1～0.4 gram; Low temperature is for being less than or equal to 120 ℃, and microvesicle diameter is 60-70 μ m;
The compound method of described conditioning agent is as follows: (1) cures dry by xanthan gum and inorganic boron crosslinking agent;
(2) in container, will be dried after xanthan gum and two kinds of materials of inorganic boron crosslinking agent in mass ratio 1:1 fully mix;
The pH value of described conditioning agent is 7, and moisture content is 12%, and water solubles content is 95%, and apparent viscosity is 20mPas, and microvesicle steady time is 29 hours;
Described pH value is that 2.0g sample is added in 200mL distilled water and recorded, water solubles content adds 0.5g sample in 250mL-300mL distilled water and records, apparent viscosity is that 2g conditioning agent joins in 400mL distilled water and records, and microvesicle is that 1.6g conditioning agent joins the character that the micro-foam drilling fluid that obtains in base fluid has steady time; Described base fluid adds sodium hydroxide by 400mL distilled water, regulates pH value between 10～11, then adds 2g sodium carbonate, 0.4g nucleator, the configuration of 0.8g membrane-forming agent to form.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2166060A1 (en) * | 2008-09-22 | 2010-03-24 | Allessa Chemie GmbH | Stabilized aqueous polymer compositions and their use |
| CN101974316A (en) * | 2010-10-14 | 2011-02-16 | 中国海洋石油总公司 | Drilling fluid for drilling |
| CN101974315A (en) * | 2010-10-14 | 2011-02-16 | 中国海洋石油总公司 | Perforating fluid for well completion |
| CN102453471A (en) * | 2010-10-22 | 2012-05-16 | 中联煤层气有限责任公司 | Fresh water-based micro bubble drilling fluid for drilling coal bed gas |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050065040A1 (en) * | 2003-09-24 | 2005-03-24 | Weaver Jimmie D. | Methods and compositions for treating subterranean formations using high ionic strength gelling agent polymers |
| US7781380B2 (en) * | 2005-01-24 | 2010-08-24 | Schlumberger Technology Corporation | Methods of treating subterranean formations with heteropolysaccharides based fluids |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2166060A1 (en) * | 2008-09-22 | 2010-03-24 | Allessa Chemie GmbH | Stabilized aqueous polymer compositions and their use |
| CN101974316A (en) * | 2010-10-14 | 2011-02-16 | 中国海洋石油总公司 | Drilling fluid for drilling |
| CN101974315A (en) * | 2010-10-14 | 2011-02-16 | 中国海洋石油总公司 | Perforating fluid for well completion |
| CN102453471A (en) * | 2010-10-22 | 2012-05-16 | 中联煤层气有限责任公司 | Fresh water-based micro bubble drilling fluid for drilling coal bed gas |
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