CN102391843A - Potassium metasilicate polymeric alcohol water base drilling fluid - Google Patents
Potassium metasilicate polymeric alcohol water base drilling fluid Download PDFInfo
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Abstract
The invention relates to a potassium metasilicate polymeric alcohol water base drilling fluid for preventing collapse and tool sticking in oil and gas field drilling operation. The drilling fluid overcomes complex situations easily caused by high temperature and pressure under a deep well and a super deep well. A technical scheme is as below: raw materials for preparing the drilling fluid comprise 40-60 parts of sodium bentonite, 40-60 parts of powder instant potassium metasilicate, 3-6 parts of tackifier, 4-6 parts of fluid loss additive, 20-40 parts of plugging agent, 8-13 parts of KCl and 1000 parts of tap water, wherein a NaOH adjusting system has a pH of 11.5. A preparation method of the drilling fluid comprises the following steps: taking 1000g of tap water; adding sodium bentonite, powder instant potassium metasilicate, tackifier, fluid loss additive, plugging agent and KCl; adjusting a pH to 11.5 by a 40% NaOH and continuing stirring for 15 min to obtain the potassium metasilicate polymeric alcohol water base drilling fluid. The product of the invention has good rheological property, water loss wall-building property, strong inhibition, good plugging capability, good lubricity and good heat stability, and can satisfy requirements of safe well drilling under complex conditions.
Description
Technical field
The present invention relates to a kind of being used under the oilfield drilling operation high temperature and high pressure environment; Has the aquation that suppresses strong water-sensitive strata (high polynite content stratum); The stratum undergauge that minimizing produces because of hydration; Stop weak water-sensitive strata piece, collapse because of what pressure transmission, capillary pressure, aquation etc. caused, and the stable potassium silicate polymeric alcohol water-base drilling fluid of rheological.
Background technology
In recent years, China's oil probing exploitation gradually by shallow-layer to deep layer, by course bad ground development simply.Because the downhole temperature and the pressure ratio of deep-well, ultra deep well are higher; Especially bore when meeting bad ground; Bigger variation be prone to take place in the down-hole drilling fluids performance, very easily causes the generation of some down hole problems, as cave in, bit freezing etc.; Thereby the novel drilling fluid system of seeking expansion of more effective inhibition stratum and stabilizing borehole is the main developing direction of drilling fluid research.Making extensive work aspect the chemically stable borehole wall both at home and abroad; Systems such as drilling workers, oil base drilling fluid, synthetic base drilling fluid, silicate drilling fluid, polyglycol drilling fluid have been developed; For example: for many years, Xinjiang Oilfield has formed one type of inhibitive drilling fluid system of own comparative maturity: potassium calcium base drilling fluid or potassium calcium base-polymeric alcohol water-base drilling fluid; This type drilling fluid have strong inhibition capability, cost lower, safeguard advantages such as convenient processing; For the oil field prospecting exploitation contributes; But; The inhibition of this type drilling fluid mainly relies on the effect of potassium calcium inorganic salt to be achieved, and promptly the effective concentration of potassium calcium ion is the weak important symbol of drilling fluid strong inhibition capability.The problem that this system exists is: do not detect the instrument of potassium calcium ion concn on the scene, cause potassium calcium ion content deficiency in the actual well drilled, had a strong impact on the performance of this kind drilling fluid anti-sloughing usefulness, in high density drilling fluid, this problem is more outstanding.
Through discovering that the potassium silicate stabilizing borehole mechanism of action is: (1) potassium silicate forms gel and stops up the crack with deposition; (2) suppress shale CLAY MINERALS AND THEIR SIGNIFICANCE hydration swelling and dispersion; (3) stop water to get into the stratum with the inorganic salt synergy; (4) silicate and stratum clay mineral generation chemical reaction.The polymeric alcohol mechanism of action roughly can be divided into freely and spreads, adsorbs and permeate three effect stages, and emphasis utilizes its cloud point effect to improve system inhibition and shut-off capacity.Generally, silicate and polymeric alcohol add in the drilling fluid system as suppressor factor and lubricant respectively, not with they composite applications.The chemical effect (gelling deposition) of potassium silicate and the physical influence (cloud point effect) of polymeric alcohol are integrally combined; Set up the membrane structure potassium silicate polyglycol drilling fluid system that a cover has gel-cloud point effect; Be intended to give full play to the stabilizing borehole mechanism of membrane structure effect, for new developing direction has been opened up in the research of drilling fluid stabilizing borehole.
Summary of the invention
The objective of the invention is: in order to overcome owing to the downhole temperature and the pressure of deep-well, ultra deep well are higher; Especially bore when meeting bad ground; The down-hole drilling fluids performance is prone to take place bigger variation; Very easily cause the generation of some down hole problems, as cave in, bit freezing etc., the spy provides a kind of potassium silicate polymeric alcohol water-base drilling fluid.
To achieve these goals, the present invention adopts following technical scheme: a kind of potassium silicate polymeric alcohol water-base drilling fluid is characterized in that: preparing raw materials used component of this drilling fluid and content does, its MU is gram or kilogram: sodium bentonite 40-60; The instant potassium silicate FP-V of powdery 40-60; Tackifier are high to be glued-CMC 99.5 HV-CMC 3-6; Fluid loss agent acrylic amide and PEMULEN TR2 JT888 4-6; Plugging agent polymeric alcohol JLX-B-S 20-40; KCl 8-13; The NaOH mass percentage concentration is 40%, and regulation system pH is 11.5, and tap water 1000 is made solvent.
The compound method of this potassium silicate polymeric alcohol water-base drilling fluid is: measure the tap water of 1000 grams earlier, add 40-60 gram sodium bentonite, behind the stirring at low speed 60min; High-speed stirring 30min at room temperature adds the instant potassium silicate FP-V of 40-60 gram powdery and stirs 5min under high speed electric stirs behind the maintenance 24h, add 3-6 gram tackifier HV-CMC and stir 5min; Add 4-6 gram fluid loss agent JT888 and stir 5min; Add 20-40 polymeric alcohol JLX-B-S and stir 5min, add 8-13 KCl and stir 5min, slowly dripping mass percentage concentration again and be 40% NaOH regulation system pH is 11.5; Continue to stir 15min, make this potassium silicate polymeric alcohol water-base drilling fluid.
The used sodium bentonite of above-mentioned preparation method; The instant potassium silicate FP-V of powdery; Tackifier HV-CMC; Fluid loss agent JT888; Polymeric alcohol JLX-B-S; KCl; NaOH is sell goods on the market, and strictness is by industry standard or enterprise's mark check when purchasing, and eligible could use, and specifically sees table 1:
Table 1 potassium silicate polymeric alcohol water-base drilling fluid basic raw material particular sheet
| The name of an article | Code name | Rank | Index request | Manufacturer |
| The instant potassium silicate of powdery | FP-V | Technical grade | Modulus 3.20-3.40,60.0-66.0% silicon-dioxide SiO 2, 28.0-32.0% potassium oxide K 2O, dissolution rate < 120 s, apparent density 0.50-0.80g/cm 3, fineness (0.154mm screenings) < 5 | Dechang, Jiashan, Zhejiang powder body material ltd |
| Tackifier are high to be glued-CMC 99.5 | HV-CMC | Technical grade | Qualified by standard test | Luzhou Chemical Plant |
| Acrylic amide, PEMULEN TR2 | JT 888 | Technical grade | Qualified by standard test | Attain the Way Industrial Co., Ltd. in Chengdu, Sichuan |
| Polymeric alcohol | JLX-B-S | Technical grade | Multipolymers such as terepthaloyl moietie, USP Kosher, two polyglycerols, three polyglycerols, trolamine | Hubei Han Ke Industrial Co., Ltd. |
| KCl | ? | ? | Qualified by standard test | The Long Huaxueshijichang of section |
| NaOH | ? | ? | Concentration is 40% | The Long Huaxueshijichang of section |
| Sodium bentonite | ? | ? | The soda ash of adding 5% on the basis of clay | Chengdu prosperous peace of a specified duration company |
Potassium silicate polymeric alcohol water-base drilling fluid provided by the invention is compared with existing like product, and have following beneficial effect: it at high temperature has better rheological (1); (2) dehydration building capacity is good; (3) strong inhibition capability; (4) contamination resistance strong (can anti-NaCl 6%, anti-Ca
2+, Mg
2+0.5%, anti-cuttings contamination reaches 15%); (5) shut-off capacity is strong; (6) oilness is good; (7) Heat stability is good can satisfy the requirement of safety probing under the complexcase.
Embodiment
Embodiment 1: the compound method of potassium silicate polymeric alcohol water-base drilling fluid:
The compound method of this potassium silicate polymeric alcohol water-base drilling fluid is: the tap water of measuring 1000 grams earlier adds 40 gram sodium bentonites, behind the stirring at low speed 60min, and high-speed stirring 30min; At room temperature under high speed electric stirs, add the instant potassium silicate FP-V of 40 gram powderies behind the maintenance 24h and stir 5min; Add 6 gram tackifier HV-CMC and stir 5min, add 4 gram fluid loss agent JT888 and stir 5min, add 20 gram polymeric alcohol JLX-B-S and stir 5min; Add 8 gram KCl and stir 5min; Slowly dripping concentration again and be 40% NaOH, to regulate pH be 11.5, continues to stir 15min, makes this potassium silicate polymeric alcohol water-base drilling fluid.
Embodiment 2: the rheological property evaluation
The aging front and back of potassium silicate polyglycol drilling fluid system fundamental property is estimated; Under differing temps to the aging 16h of potassium silicate polyglycol drilling fluid system; Be cooled to room temperature; Height stirs the performances such as AV AV, PV PV, yield value YP and leak-off property of the system of measuring behind the 5min, and its experimental result is seen table 2:
The rheological property evaluation of table 2 drilling fluid
Remarks:
STUDY OF POTASSIUM SILICATE DRILLING FLUID SYSTEM prescription: (concentration is 40% to an amount of NaOH of 4% soil paste+4%FP-V+0.4%HV-CMC+0.4%JT888+1%KCl+; Regulating pH is 11.5); Potassium silicate polyglycol drilling fluid system formulation: an amount of NaOH of 4% soil paste+4%FP-V+0.4%HV-CMC+0.4%JT888+3%JLX-B-S+1%KCl+ (concentration is 40%, and regulating pH is 11.5);
drilling fluid traditional performance height after heat is rolled stirs 25min; 25 ℃ of tests down, down together:
Can find out from table 2 experimental data; Two kinds of systems are after high temperature; Aggregate performance is viscosity effect reduction, rheological variation and the corresponding increase of WL, and after STUDY OF POTASSIUM SILICATE DRILLING FLUID SYSTEM was adding polymeric alcohol, the viscosity of system, rheological and WL obviously were superior to STUDY OF POTASSIUM SILICATE DRILLING FLUID SYSTEM; And the temperature resistance ability and the dehydration building capacity of potassium silicate polymeric alcohol system also are superior to STUDY OF POTASSIUM SILICATE DRILLING FLUID SYSTEM; Even temperature reaches 150 ℃, system still has good rheological and lower WL, and this is because other treatment agents of the polymeric alcohol that adds produce the result of high-temperature cross-linking effect.
Embodiment 3: the dehydration wall building properties is estimated
The dehydration building capacity of drilling fluid is the key property of drilling fluid, and it has crucial influence to wellbore stability loose, broken and chance water unstability stratum.This paper estimates the dehydration building capacity of potassium silicate polyglycol drilling fluid system, and experimental result is seen table 3:
Table 3 drilling fluid system dehydration wall building properties
Be not difficult to find out from table 3 experimental data, increase to some extent before API dehydration, HTHP dehydration and the hmc of two kinds of systems after aging is all aging, but after adding polymeric alcohol, the API dehydration of system, HTHP and mud cake dehydration take a turn for the better to some extent.It is thus clear that the adsorptive power when polymeric alcohol exists of the treatment agent in the system strengthens, and produces the high-temperature cross-linking effect, has changed system Dispersion of Clay degree, globule size and grating, make its globule size and level weight set, improved the dehydration building capacity of system.
Embodiment 4: inhibition evaluation (repression of swelling experiment)
The inhibition evaluation is an importance of drilling liquid performance evaluating, and two kinds of evaluation methods are arranged: the one, suppress dispersed (roll and reclaim) experiment; The 2nd, the repression of swelling experiment.This paper has adopted the mud shale expansion experimental evaluation inhibition of system, the gained experimental result is as shown in table 4:
The experiment of table 4 system repression of swelling
Can be known that by table 4 experimental data behind the 2h, the linear expansion rate of clear water is 1.75 times of STUDY OF POTASSIUM SILICATE DRILLING FLUID SYSTEM, be 2.0 times of potassium silicate polyglycol drilling fluid system; Behind the 16h; The linear expansion rate of clear water is 2.42 times of STUDY OF POTASSIUM SILICATE DRILLING FLUID SYSTEM, is 2.85 times of potassium silicate polyglycol drilling fluid system, and is visible; Two kinds of systems all have certain inhibition; But the inhibition of potassium silicate polyglycol drilling fluid system is superior to STUDY OF POTASSIUM SILICATE DRILLING FLUID SYSTEM, more can keep wellbore stability preferably, prevents the generation of complex accident such as well slough.
Embodiment 5: anti-salt pollution merit rating
When boring deep formation, bore chance gypsic horizon, brine layer, cement plug etc. through regular meeting and contain a large amount of Ca
2+, Mg
2+And the stratum of NaCl; Cause drilling fluid generation salt contamination or calcium to be invaded, cause drilling fluid mud cake compactness extent to reduce and the rate of permeation increase, the mud cake quality variation; Filter loss increases; Finally cause drilling fluid rheology, dehydration building capacity variation, poor because of mud cake quality simultaneously, filter loss causes hole instability greatly, and aggravation is to the corrosion and the damage of drilling tool.Therefore to the anti-Ca of drilling fluid system
2+, Mg
2+Reach the NaCl pollution capacity and estimate, experimental data is seen table 5:
Table 5 drilling fluid system contamination resistance
Can find out that by table 5 result when the NaCl content in the system was in 6%, drilling fluid rheology was still better; Dehydration amplification is little, but when NaCl content reached 10%, the rheological of system changed greatly; The API dehydration can not meet the demands, so the saline-alkaline tolerance of system is 6%; In like manner can find out the anti-Ca2+ of system, the ability 0.5% of Mg2+.
Embodiment 6: anti-cuttings contamination merit rating
Drilling fluid in use must have certain anti-landwaste pollution capacity could guarantee solid load in reasonable range, reduces the drilling well frictional resistance, reduces pressure differential sticking, strengthens borehole wall stability.The anti-cuttings contamination ability of potassium silicate polyglycol drilling fluid system experimental data is seen table 6:
The anti-cuttings contamination ability of table 6 drilling fluid system
Remarks: landwaste is a Sichuan red beds soil
Experimental data by table 6 can find out that along with the increase of landwaste content in the potassium silicate polyglycol drilling fluid, the AV of system, PV and yield value all are the trend of rising; When the drilling cuttings dosage reaches 15%; AV amplification enlarges markedly, and the obvious thickening of drilling fluid, the mud cake thickening; Dehydration also seriously increases, but the performance of system still can satisfy the requirement of drilling well; When landwaste content reaches 20%, can not satisfy the demands, so the anti-drilling cuttings ability of drilling fluid system is 15%.
Embodiment 7: the lubricity evaluation
The oilness of drilling fluid is very big to drilling operation influence, particularly bores deep-well ultra deep well, long horizontal traverse well and horizontal well, the rotational resistance of drill string with lift resistance and can increase substantially; Turn round the oilness that to refuse the main adjustable factor with the wearing and tearing of resistance and drilling tool be drilling fluid owing to influence drilling well, so the oilness of drilling fluid is to reducing down hole problem such as bit freezing, guarantees to creep into safely, fast and play an important role; Drilling fluid is heated after 80 ℃, survey the 30minAPI dehydration, take out mud cake; Put on the mud cake coefficient of friction resistance determinator; Pour into 80 ℃ drilling fluid a little, survey the coefficient of friction resistance, experimental result is seen table 7:
Table 7 system oilness is estimated
| System | Mud cake coefficient of friction resistance K f | Frictional resistance rate % falls |
| 4% sodium bentonite slurry | 0.0748 | － |
| STUDY OF POTASSIUM SILICATE DRILLING FLUID SYSTEM | 0.0541 | 27.7 |
| Potassium silicate polyglycol drilling fluid system | 0.0326 | 56.4 |
Is K according to CNPC to common drilling fluid recommended standard
fBe controlled in 0.05～0.09 scope, can know, the coefficient of friction resistance K of potassium silicate polyglycol drilling fluid system by table 6 experimental data
fBe merely 0.0326, be lower than 0.05, have good lubricating property, this is for reducing the drilling tool frictional resistance, reduces the generation of down-hole complex accident effectively and bore smoothly to reach zone of interest and lay a good foundation.
Embodiment 8: the shut-off capacity evaluation
The high-temperature and high-pressure filter press that utilizes two ends to dismantle, end dress filter paper and aggrade layer, the other end dress drilling fluid, device is under the plumbness certain pressure, and plugged zone can form:
(1) aggrade layer particulate selected: by the grade of granularity under the screening sampling, selected the silica sand of 10～20 orders, 20～40 orders, three kinds of granularities of 100～120 orders in the experiment, taken by weighing 23g, 23g, 35g respectively and be mixed and stir;
(2) selected particle is packed in the container, evenly vibration is gently pressed 0.1MPa, the shutoff drilling fluid of packing into;
(3) 90 ℃, the following 30min filter loss of measuring of 3.5MPa;
(4) change used drilling fluid into clear water, in 3.5～4.9MPa scope, measure filter loss under the different pressures;
Table 8 shutoff test-results
Remarks: 14.5psi=0.1Mpa
Table 8 shows: in institute's measuring pressure scope, clear water rate of permeation and pressure are kind of linear relationships, therefore can confirm that drilling fluid shutoff band under this pressure reduction is more intact, do not go to pot.This shows that STUDY OF POTASSIUM SILICATE DRILLING FLUID SYSTEM and potassium silicate polyglycol drilling fluid system all have stronger shut-off capacity; Especially the plugging effect of potassium silicate polyglycol drilling fluid system is better, still, and in the pressure elevation process; It is little that the formed mud cake clear water of potassium silicate polyglycol drilling fluid filter loss increases Trendline slope ratio potassium silicate drilling fluid; This explanation adds polymeric alcohol in STUDY OF POTASSIUM SILICATE DRILLING FLUID SYSTEM, can strengthen the system shut-off capacity, improves the plugged zone bearing capacity.
Embodiment 9: the thermal stability evaluation
This paper has investigated wellbore fluid and has tied up to and increase the weight of anteroposterior diameter and cross the changing conditions that 125 ℃ of heat are rolled the rheological property after 16 hours and 48 hours, and its result sees table 9:
Thermal stability before and after table 9 drilling fluid system increases the weight of
Can find out by table 9, compare AV and the quiet dehydration of API before increasing the weight of after potassium silicate polyglycol drilling fluid system increases the weight of and all rise to some extent, under 125 ℃; Along with heat is rolled the time growth, the two AV, PV and yield value all reduce, and the quiet dehydration of API increases; After heat was rolled 48h, the quiet dehydration of drilling fluid API was satisfied the standard-required of API less than 10ml still less than 10ml before and after increasing the weight of; It is thus clear that potassium silicate polyglycol drilling fluid system thermal stability is good.
Claims (2)
1. potassium silicate polymeric alcohol water-base drilling fluid, it is characterized in that: preparing raw materials used component of this drilling fluid and content does, its MU is gram or kilogram; Sodium bentonite 40-60; The instant potassium silicate FP-V of powdery 40-60; Tackifier are high to be glued-CMC 99.5 HV-CMC 3-6; Fluid loss agent acrylic amide and PEMULEN TR2 JT888 4-6; Plugging agent polymeric alcohol JLX-B-S 20-40; KCl 8-13; The NaOH mass percentage concentration is 40%, and regulation system pH is 11.5, and tap water 1000 is made solvent.
2. according to the said water-base drilling fluid of claim 1, it is characterized in that: this potassium silicate polymeric alcohol water-based drilling liquid making method is: measure the tap water of 1000 grams earlier, add 40-60 gram sodium bentonite, and behind the stirring at low speed 60min, high-speed stirring 30min again; At room temperature under high speed electric stirs, add the instant potassium silicate FP-V of 40-60 gram powdery behind the maintenance 24h and stir 5min; Add 3-6 gram tackifier HV-CMC and stir 5min; Add 4-6 gram fluid loss agent JT888 and stir 5min; Add 20-40 gram polymeric alcohol JLX-B-S again and stir 5min, add 8-13 gram KCl and stir 5min; The last mass percentage concentration that slowly drips is that 40% NaOH regulation system pH is 11.5, continues to stir 15min, makes this potassium silicate polymeric alcohol water-base drilling fluid.
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| CN103642466A (en) * | 2013-11-28 | 2014-03-19 | 蔡修枝 | Novel anti-balling fluid loss drilling fluid treatment agent |
| CN104046339A (en) * | 2014-06-03 | 2014-09-17 | 中联煤层气国家工程研究中心有限责任公司 | Drilling fluid for reducing formation damage, and drilling fluid used in coal-bed gas development drilling |
| CN104479649A (en) * | 2014-12-31 | 2015-04-01 | 西南石油大学 | Low density water-based drilling fluid for drilling into shale |
| CN105331339A (en) * | 2015-11-18 | 2016-02-17 | 辽宁石油化工大学 | Sodium silicate containing polyalcohol drilling fluid for offshore drilling |
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| CN105866339A (en) * | 2016-05-05 | 2016-08-17 | 西南石油大学 | Evaluation mud cake for shale water-based drilling fluid blocking performance and preparation method |
| CN109135694A (en) * | 2018-10-23 | 2019-01-04 | 四川泓华油气田工程科技有限公司 | A kind of drilling fluid sealing agent and preparation method thereof |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103642466A (en) * | 2013-11-28 | 2014-03-19 | 蔡修枝 | Novel anti-balling fluid loss drilling fluid treatment agent |
| CN103642466B (en) * | 2013-11-28 | 2016-03-30 | 蔡修枝 | A kind of anti-mud drum filtrate reducing additive for drilling fluid |
| CN104046339A (en) * | 2014-06-03 | 2014-09-17 | 中联煤层气国家工程研究中心有限责任公司 | Drilling fluid for reducing formation damage, and drilling fluid used in coal-bed gas development drilling |
| CN104046339B (en) * | 2014-06-03 | 2017-03-15 | 中联煤层气国家工程研究中心有限责任公司 | Drilling fluid used in the drilling fluid of reduction formation damage and cbm development drilling well |
| CN104479649A (en) * | 2014-12-31 | 2015-04-01 | 西南石油大学 | Low density water-based drilling fluid for drilling into shale |
| CN104479649B (en) * | 2014-12-31 | 2017-09-05 | 西南石油大学 | One kind drilling shale low density water base drilling fluid |
| CN105331339A (en) * | 2015-11-18 | 2016-02-17 | 辽宁石油化工大学 | Sodium silicate containing polyalcohol drilling fluid for offshore drilling |
| CN105385424A (en) * | 2015-11-18 | 2016-03-09 | 辽宁石油化工大学 | Water-based drilling fluid for loosening sandstones |
| CN105866339A (en) * | 2016-05-05 | 2016-08-17 | 西南石油大学 | Evaluation mud cake for shale water-based drilling fluid blocking performance and preparation method |
| CN105866339B (en) * | 2016-05-05 | 2018-01-05 | 西南石油大学 | The evaluation mud cake and preparation method of a kind of shale water-base drilling fluid sealing characteristics |
| CN109135694A (en) * | 2018-10-23 | 2019-01-04 | 四川泓华油气田工程科技有限公司 | A kind of drilling fluid sealing agent and preparation method thereof |
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Application publication date: 20120328 |