CN104419388A - Mosaic shielding drilling fluid - Google Patents
Mosaic shielding drilling fluid Download PDFInfo
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- CN104419388A CN104419388A CN201310367293.2A CN201310367293A CN104419388A CN 104419388 A CN104419388 A CN 104419388A CN 201310367293 A CN201310367293 A CN 201310367293A CN 104419388 A CN104419388 A CN 104419388A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/02—Well-drilling compositions
- C09K8/04—Aqueous well-drilling compositions
- C09K8/06—Clay-free compositions
- C09K8/12—Clay-free compositions containing synthetic organic macromolecular compounds or their precursors
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F292/00—Macromolecular compounds obtained by polymerising monomers on to inorganic materials
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Abstract
The invention relates to mosaic shielding drilling fluid, which comprises the following components by weight content: 0.2-8.5% of mosaic shielding agent, 0-5% of adhesion agent, 0-8% of weighting agent and the balance of base liquid, the mosaic shielding agent is added in water with a monomer, an initiator, a dispersant and rigid core, the components are uniformly stirred and heated to a reaction, and then dried to obtain the drilling fluid. The drilling fluid has unidirectional plugging effect due to usage of the mosaic shielding agent, and has good adaptability for inlet apertures with different shapes due to elastic variability characteristic, and the oil well production power can not be influenced.
Description
Technical field
The present invention relates to one and inlay shielding drilling fluid, and this inlays preparation method and the using method of shielding drilling fluid.
Background technology
Along with the sustainable growth of world's Demand of Oil & Gas, the dynamics of protection reservoir drilling fluid technology exploratory development complex reservoir is adopted to strengthen year by year.Development Low Damage drill in fluid, alleviates the formation damage caused in drilling process to greatest extent, is the key obtaining complex reservoir probing achievement.
In order to effectively stop mud filtrate invasion reservoir, existing conventional temporary shielding method ,barrier building temporary seal incores, shielding and temporary plugging technology and ideal filling temporary shielding method ,barrier building temporary seal incores etc. in prior art.These temporary shielding method ,barrier building temporary seal incores require that temporary plugging agent size of particles is less than hole or flaw size, and strictly mate with reservoir pore throat size by certain rule, therefore Obtaining Accurate reservoir pore space size and distribution situation are prerequisite and the key points of successful implementation temporary shielding method ,barrier building temporary seal incores.But, due to the restriction by reservoir rock nonuniformity, often be difficult to the pore dimension data of Obtaining Accurate construction well, usually cause shield-temporary plugging effect undesirable, sometimes the infringement to hydrocarbon zone can even be strengthened, and after shield-temporary plugging, often need follow-up de-plugging operation, add production cost, the drilling fluid mechanism of action of prior art can see Fig. 1.
For desirable drilling fluid, investor needs most: in pit shaft, reservoir pollution is minimum, or close to pollution-free (30mm), output is high; Reservoir cementing quality is qualified (95 ~ 100%) all; Life-span is long, avoids altering layer, cover damages or causes sidetracking; Recycle slurry, hole slurry all can reclaim and reuse, with meet the requirement of environmental protection on the ground.And drilling engineering side needs most: in pit shaft, the sticky card of Thief zone sandstone well section, mistake are starched excessive; Mud shale well section does not want collapsing and breaking, pulping, ball-up; Lower curved section will low leak-off, lubrication, destruction casting bed, low frictional resistance; Little and the narrowly distributing of wellbore stability, amplification degree; Cutting condition conservation rate is high; Drilling cuttings is easy to disposable and removes on the ground; Recycle slurry, hole starch all recyclable reusing.The key of technology is, under the geologic condition of complexity, can not with in bentonitic environment, realization need not bentonitic safe and efficient drilling well.
Summary of the invention
In order to overcome above-mentioned defect and reach the expectation of each side, the invention provides one and inlay shielding drilling fluid.Further, the present invention also provides a kind of preparation method and using method of inlaying shielding drilling fluid.
The present inventor obtains a kind ofly comprising the drilling fluid inlaying screener through research with keen determination.Have the advantages that elastic variable and diameter be greater than reservoir pore space diameter owing to inlaying screener, under the effect of pressure reduction, inlay screener particulate fraction and be inlaid into pore entryway place, hole is blocked, rest part, still outside hole, plays the effect of unidirectional shutoff.Meanwhile, the elastic variable feature of this plugging material can make it be that difform hole all has good adaptability to entrance, overcome rigid particles because not being out of shape the shortcoming of bad adaptability.Its mechanism of action can see Fig. 2.
According to the component of inlaying shielding drilling fluid and comprising following weight content provided by the invention:
Inlay screener, 0.2%-8.5%,
Tackifier, 0-5%,
Weighting agent, 0-8%
Liquid based on surplus,
Wherein, described weight content refers to that described component is based on the weight percent inlaying shielding drilling fluid gross weight.
Inlay in shielding drilling fluid provided by the invention, based on drilling fluid gross weight, inlaying screener content is 0.2%-8.5%, preferred 2%-5%.When inlay screener content within the scope of this time, gained drilling fluid effectively can inlay the space around shutoff drilling well, prevent drilling fluid permeate invade reservoir.If inlay screener content lower than 0.2%, cause because its consumption is too low inlaying shielding deficiency, drilling fluid may permeate intrusion reservoir.On the other hand, if inlay screener content higher than 8.5%, not only because the too high cost that causes of its consumption increases, and reside in drilling fluid because consumption surplus causes inlaying screener particle, affect the performance of drilling fluid.
In the present invention, screener of inlaying used is prepared by the following method:
100 parts by weight rigid inorganic kernels, 500-2600 weight parts monomers, 50-300 weight part initiator and 30-300 parts per weight dispersing agent etc. are added to the water, are warming up to 60 DEG C-90 DEG C, have reacted rear formation long chain polymer, dry and obtain inlaying screener.
Wherein, described rigid inorganic kernel is selected from quartz sand or silicate minerals.
Described monomer is acrylamide.
Described initiator is selected from: acyl class superoxide is as benzoyl peroxide, lauroyl peroxide etc., or ester class superoxide is as peroxidized t-butyl perbenzoate, peroxidation trimethylacetic acid tertiary butyl ester; Can use wherein any one, or two or more arbitrary composition.
Described dispersion agent is selected from triethyl hexyl phosphoric acid, sodium lauryl sulphate, methyl amyl alcohol or guar gum etc.Can use wherein any one, or two or more arbitrary composition.
Inlaying in screener according to provided by the invention, as monomer, the composition of acrylamide and other monomers also can be used, but not preferred.
Usually, be 4 ~ 400 μm according to screener median size of inlaying provided by the invention, preferred median size is at about 50 μm.In practice, the particle diameter inlaying screener can adjust according to need of production.
Be network gel according to screener of inlaying provided by the invention, physical dimension reaches 4 ~ 400 μm, on drilling cuttings surface, multipoint adsorption can occur, and suppress dispersion.Network gel covers drilling cuttings surface, causes the isolation of drilling cuttings and free water, produces and suppresses dispersion.Inlay shielding system mud shale is had to very strong suppression, bag quilt, prevents the effect of caving in.
Have the following advantages according to screener of inlaying provided by the invention: 1. good elasticity and certain deformability, recoverable deformation can be there is under differential pressure action, to adapt to the pore throat of different shapes and size, good plugging action is produced to the pore throat of wider size, reduce drilling fluid filtration; 2. suppress the aquation of clay to be disperseed, have good anti-collapse effect, oil layer protection is respond well; 3. good, non-foaming with the compatibleness of drilling fluid and other treatment agent; 4. nontoxic, be conducive to environment protection.
According to screener of inlaying provided by the invention, there is the multinomial effects such as thickening, filtrate reducing, anti-collapse and formation protection; have the advantages that potion is multiplex; the present inventor infers that its mechanism of action is as described below, but following mechanism is only explain possibility of the present invention, and the present invention is not limited to this.
1, thickening cuts mechanism
(1) planar water effect
Inlay screener to have and appropriate be polymerized by acrylamide monomer the adsorption group formed, the water molecules of some amount can be adsorbed, make part free water in drilling fluid become planar water, cause drilling fluid viscosity to increase.
(2) spatial grid structure is formed
By rational Molecular Structure Design, inlaying screener molecule self can be interconnected, and forms the spatial grid structure with some strength, increases viscosity and the shear force of drilling fluid.
2, filtrate reducing mechanism
(1) strong plugging action
Inlay after screener molecule contacts with water, have an iron hand in a velvet glove feature, its inside is the high rigid particles of intensity, and outside for having comparatively strong elasticity and deformability flexible body, this feature makes it have good adaptability to difform hole and crack.Under differential pressure action, inlay screener particle and be squeezed into hole or crack, its external flexible part is relied on to produce very large frictional force, after multiple particle enters hole or crack simultaneously, the superposition of its frictional force will be greater than drawdown pressure, thus by the complete shutoff of hole or crack, effectively reduce drilling fluid filtration.
(2) viscosifying action
Increasing drilling fluid viscosity and shear force by inlaying screener, increasing filtrate flows resistance, reducing filter loss.
3, mechanism of anti caving
(1) strong plugging action
Inlay after screener molecule contacts with water, have an iron hand in a velvet glove feature, its inside is the high rigid particles of intensity, and outside for having comparatively strong elasticity and deformability flexible body, this feature makes it have good adaptability to difform hole and crack.Under differential pressure action, inlay screener particle and be squeezed into hole or crack, rely on its external flexible part to produce very large frictional force, after multiple particle enters hole or crack simultaneously, the superposition of its frictional force will be greater than drawdown pressure, thus by the complete shutoff of hole or crack.
(2) high inhibition effect
Inlay the positive charge of screener molecule with some amount, be adsorbed onto drilling cuttings surface by electrostatic attraction, with the negative charge of clay in part, form adsorption layer on drilling cuttings surface simultaneously, reduce the contact of drilling cuttings and water, effective hydration swelling and dispersion suppressing clay.
4, reservoir protec-tion mechanism
(1) strong plugging action
Inlay after screener molecule contacts with water, have an iron hand in a velvet glove feature, its inside is the high rigid particles of intensity, and outside for having comparatively strong elasticity and deformability flexible body, this feature makes it have good adaptability to difform hole and crack.Under differential pressure action, inlay screener particle and be squeezed into hole or crack, rely on its external flexible part to produce very large frictional force, after multiple particle enters hole or crack simultaneously, the superposition of its frictional force will be greater than drawdown pressure, thus by the complete shutoff of hole or crack.
(2) the plugged zone easily row of returning
(3) high inhibition effect
Inlay the positive charge of screener molecule with some amount, be adsorbed onto drilling cuttings surface by electrostatic attraction, with the negative charge of clay in part, form adsorption layer on drilling cuttings surface simultaneously, reduce the contact of drilling cuttings and water, effective hydration swelling and dispersion suppressing clay.
Inlay in shielding drilling fluid provided by the invention, tackifier and weighting agent can be comprised as required.Wherein, the effect of tackifier is to increase drilling fluid viscosity, and the effect of weighting agent is to increase drilling fluid density, thus is suitable for Different Strata needs.
Inlay in shielding drilling fluid provided by the invention, tackifier are not particularly limited, the tackifier that this area is conventional can be used, as resol class organic high molecular polymer etc.Its content can be selected according to actual needs, such as 0-5%, more preferably 1%-5%, and described content refers to the weight percentage based on drilling fluid gross weight.
Inlay in shielding drilling fluid provided by the invention, weighting agent is not particularly limited, the weighting agent that this area is conventional can be used, as solubility salt, comprise inorganic salt and organic salt, such as NH
4cl, KCl, KHCO
3, NaCl, MgCl
2, CaCl
2, ZnCl
2, ZnBr
2deng, more preferably NH
4cl, KCl, KHCO
3.Wherein any one can be used, or combinationally use wherein two or more.
When using weighting agent, Main Basis is as follows:
Density selection principle: be 1.05 ~ 1.10 times of reservoir pressure coefficient or formation collapsed pressure.
Proportion is regulated the speed: conventional, one week, △ d≤0.02/; When having spilling, coordinate and inlay screener, one week, △ d=0.02 ~ 0.10/.
In a preferred embodiment, use the foundation of weighting agent kind as follows:
When A, d≤1.15, select NH
4cl increases the weight of or adopts bittern.
When B, d=1.15 ~ 1.20, select KCl or NaCl to increase the weight of or adopt bittern.
When C, d=1.20 ~ 1.35, select KHCO
3, MgCl
2or CaCl
2increase the weight of.
When D, d=1.35 ~ 1.48, select KHCO
3, CaCl
2increase the weight of.
When E, d=1.48 ~ 1.75, select KHCO
3, MgCl
2or CaCl
2increase the weight of to after saturated, then use ZnCl
2continue to increase the weight of.
When F, d=1.75 ~ 2.0, select ZnBr
2increase the weight of.
Symbol △ d used represents variable density in this article;
Symbol d used represents density in this article.
Provided by the invention inlay shielding drilling fluid in, based on liquid, be not particularly limited, can use fresh water, salt solution or seawater or local area backflow sewage.
Described " local area backflow sewage " refers to the sewage formed at wellbore construction scene.Because wellbore construction scene is often very remote, nervous with water source, be difficult to supply clean water source, use local area backflow sewage can not only solve the problem of water source supply difficulty, and adopt local area backflow sewage can guarantee performance of inlaying shielding drilling fluid of the present invention completely.
Inlay shielding drilling fluid for provided by the invention, one or more other auxiliary agents that this area is conventional can also be comprised as required, as lubricant, plugging agent etc.Those skilled in the art can select their consumption as required, and this is in the limit of power of those skilled in the art.
As auxiliary agent, mention lubricant especially.When drilling fluid itself has lubrication, the oilness of drilling fluid not only can reduce the wearing and tearing of drilling tool, and has material impact to raising drilling speed.The lubricant that the present invention adopts can be solid lubricant or liquid lubricant, and the solid particulate that solid lubricant is mainly tiny, such as graphite PP, glass pellet, resin beads etc., it effectively can reduce friction resistance.Liquid lubricant is mainly oily, comprises vegetables oil and mineral oil, as 24# white oil, also can be the emulsion that oil is made into together with tensio-active agent.After adding lubricant, filter cake surface adhesion coefficient reduces, and it can reduce friction resistance and adhesion friction resistance.
Shielding drilling fluid of inlaying of the present invention can adjust according to the various methods recorded in prior art, to adapt to different situations or different needs.
Such as, hierarchy of control pH value can add the performance that NaOH can improve system: filter loss reduces; Shear force rises; Flow pattern shear thinning, bright cunning.
By various component being mixed, drilling fluid of the present invention can be obtained.As hybrid mode, be not particularly limited, conventional blending means can be used, as mechanical stirring mixing, magnetic agitation mixing etc.
Of the present invention inlay shielding drilling fluid be a kind of novel drilling fluid system, tool has the following advantages:
(1) composition is simple
By water, inlay screener and solubility salt forms, it is theoretical to have departed from clay dispersion system, and by the various property of drilling fluid inlayed screener and provide required, improve density by soluble salt, composition is simple, easy to maintenance.
(2) drilling speed is fast
Inlay shielding drilling fluid system and can not add clay and Solid weighting agents, inhibition is good, and clay does not disperse wherein substantially, and solid load is low, submicron particles quantity is few.Solid phase in drilling fluid system is the drilling cuttings produced in drilling process, and by using rational solid control equipment, solid load general control is within 5%, and density is 1.2g/cm
3conventional drilling liquid-solid phase content about 15%, density gets over high solid loading to be increased thereupon.Inlay the feature that solid load is low and submicron particles quantity is few of shielding drilling fluid, its rate of penetration is improved greatly, drilling speed can be made under experiment equal conditions to improve 2-4 doubly.
(3) reservoir protec-tion is conducive to
Inlay the special role of screener, can form screened film after invaded formation 3-5mm, drilling fluid can not deeper invaded formation, protects hydrocarbon zone well.Indoor detection due to filter paper too thin, the filter loss of this system is between 5 ~ 10ml, and at the scene because stratum and rock as the skeleton of screener, can form shielding, drilling fluid leak-off is at the scene lower, generally lower than 5ml.And this drilling fluid inhibition is fine, effectively can suppress hydration swelling, the dispersion of clay, avoid oil reservoir generation water sensitivity to damage.
In Turkmenistan, Changqing oilfields, CNOOC clothes application show, inlay shielding drilling fluid allocation good after, the drilling fluid inside circulation tank there is no change, seldom adds drilling fluid.This system belongs to substantially without leak-off system, protects hydrocarbon zone well.
(4) wellbore stability is conducive to
Inlay shielding drilling fluid stabilizing borehole mechanism as follows:
1. shut-off capacity is strong: inlay shielding drilling fluid shutoff formation pore and crack effectively, stop mud filtrate invasion stratum, prevent formation rock intensity from reducing.
2. rejection ability is strong: by inlaying the effect of screener, effectively can prevent hydration swelling, the dispersion of clay, thus avoids slump in because clay swelling causes, undergauge, decreases the generation of down-hole accident.Appearance lock of tool drilling is not had in the well of having constructed.
3. stop pressure transmission: by its strong plugging action, effectively reduce the pressure transmission between resident fluid and drilling fluid, make drilling fluid produce good lateral support all the time to rock of borehole.
(5) contamination resistance is strong
Inlay shielding drilling fluid and departed from clay dispersion system theory, clay does not disperse in this system, inlays screener anti-calcium and anti-salt ability by force, and the ability of anti-various pollution is strong.
(6) preparation is simple, strong adaptability
This system can use the multiple water preparation such as seawater, bittern, fresh water, and do not have special requirement to water with slurry, during preparation, cost does not increase.And conventional drilling liquid with seawater, bittern preparation time will increase substantially cost.
(7) reusable edible, real realization " zero release "
This drilling fluid can all be recycled, and has both solved the recycling of drilling fluid, turn avoid rejected well drilling liquid contaminate environment, drilling well is really achieved " zero release ", not only reduces pollution abatement costs but also protect environment.
3, Economic and Efficiency Analysis
(1) drilling expense reduces
Drilling expense reduces main from 3 aspects:
1) drilling fluid expense declines
Can reusing due to what inlay shielding drilling fluid, when beating first well by this system, cost is higher than conventional mud, and the expense of inhibitive drilling fluid is similar.But its cost is 58% of conventional drilling liquid when getting to 10 mouthfuls of wells.Cost accounting is as follows: inlaying shielding drilling fluid every mouthful well normal consumption is that 25%(takes away this drilling fluid 10% when arranging landwaste outward, and other loss calculates by 15%, namely needs the drilling fluid of interpolation 25% after second mouthful of well, by that analogy).Compared for 3000m now: conventional drilling liquid about 240,000 yuan, so making a call to 10 mouthfuls of wells needs 2,400,000 yuan, and making a call to 100 mouthfuls of wells needs 24,000,000 yuan; Make a call to about 430,000 yuan, 1 mouthful of well with inlaying shielding drilling fluid, 10 mouthfuls of wells need 139.75 ten thousand yuan, and making a call to 100 mouthfuls of wells needs 1,107 ten thousand yuan.Compare brill 100 mouthfuls of wells with the drilling well of conventional drilling liquid and can economize on the use of funds 1,290 ten thousand yuan, reduce 53%.
2) drilling period is shortened
1. drilling speed is fast
Inlay shielding drilling fluid system and do not add clay and Solid weighting agents, inhibition is good, and clay does not disperse wherein substantially, and solid load is low, submicron particles quantity is few.Solid phase in drilling fluid system is the drilling cuttings produced in drilling process, and by using rational solid control equipment, solid load general control is within 5%, and density is 1.2g/cm
3conventional drilling liquid-solid phase content about 15%, density gets over high solid loading to be increased thereupon.Inlay the feature that solid load is low and submicron particles quantity is few of shielding drilling fluid, its rate of penetration is improved greatly, drilling speed can be made under experiment equal conditions to improve 2-4 doubly.
2. complexcase are few
By inlaying the effect of screener, this drilling fluid has good plugging action, restraining effect and resistance and delays pressure transmission effect, thus avoids slump in, undergauge, decreases the generation of down-hole accident.
3) facility investment is reduced, brownout
A large amount of remove soil, barite and polymkeric substance because conventional drilling liquid adds, require very high to solids control, also very high to solids control equipment requirements.And the high-density weighting material inlaying shielding drilling fluid is salt soluble in water, prepare very simple.On-the-spot can meet need of production completely with 3 circulation tanks, and conventional system ratio eliminate 2 circulation tanks, 1 bench centrifuge, 6 stirrers, 1 shearing pump, 2 increase the weight of the equipment such as pump, investment reduction more than 100 ten thousand yuan, reduces the power load of 200KW simultaneously.
(2) oil well output is improved
Inlay the special role of screener, can form screened film after invaded formation 3-5mm, drilling fluid can not deeper invaded formation, protects hydrocarbon zone well.Indoor detection due to filter paper too thin, the filter loss of this system is between 5 ~ 10ml, and at the scene because stratum and rock as the skeleton of screener, can form shielding, drilling fluid leak-off is at the scene lower, generally lower than 5ml.And this drilling fluid inhibition is fine, effectively can suppress hydration swelling, the dispersion of clay, avoid oil reservoir generation water sensitivity to damage.
In Turkmenistan, Changqing oilfields, CNOOC clothes application show, inlay shielding drilling fluid protect hydrocarbon zone well, oil well output significantly improves.
(3) protection of the environment
Inlay shielding drilling fluid self and there is good environmental-protecting performance, nontoxic, tasteless, be conducive to environment protection.Meanwhile, inlaying shielding drilling fluid can all recycle, and really achieves " zero release ", has both protected environment and again saved environment protection treating expense.
In sum, inlaying shielding drilling fluid is a kind of brand-new drilling fluid system, and not only can reduce drilling well comprehensive cost can also reservoir protec-tion well, and thoroughly solves problem of environmental pollution.
In actual applications, inlay shielding drilling fluid system solids control method mainly adopt with swirler be separated, be aided with vibrosieve from, in the case of necessary, adopt whizzer regulate solid phase inferior.
Wherein, vibrosieve is from a small amount of thick drilling cuttings, and working method is as follows with control: (1) 0.0 ~ 3000m selects 30 ~ 40 orders; (2) 3000 ~ 4000m select 40 ~ 60 orders; (3) >=4000m selects more than 60 orders.
Swirler is separated most drilling cuttings, and working method is as follows with control: (1) must ensure umbrella stream, is regulated by valve, sand spit; (2) liquid of discharging, draws back to glue preparing tank with little pump, reuses.
Whizzer is separated most solid phase inferior, and working method is as follows with control: (1), when shale is too much, mud cake is deteriorated, dehydration increases, mud drum easily occurs, drilling speed reduces, and should use whizzer; (2) when complexcase, property of drilling fluid difference, use whizzer more.
Use operational condition, main points, the ground circulation technology of inlaying shielding drilling fluid of the present invention:
(1) the necessary condition of shielding Drilling Fluid operation is inlayed:
1) slush pump discharge capacity must ensure up-hole velocity >=0.8m/m.
2) supply and specially remove solid phase recycle unit power >=48KW.
3) well head returns out thrust-augmenting nozzle and discharges containing sand (drilling cuttings) drilling fluid, must ensure that drilling fluid and sand enter simultaneously and specially remove solid phase recycle unit.
(2) technological operation main points:
1) proportion: ensure that overvoltage drilling well is without spilling, phenomenon of caving in.Scene is prepared enough and is added geavy salt.
Before spudding in, base fluid proportion can lower than requiring most high specific gravity 0.06.
2) dehydration: low leak-off≤5.0ml/30min; Circulation tank observes wastage :≤0.3m
3/ h.
Before spudding in, the dehydration of the drilling fluid prepared by base fluid can control at 10 ~ 19ml/30min.
3) lubricate: high lubricant viscosity >=50s; Sticking coefficient≤0.03; Put-on and delegated is hampered≤and 5 tons.Plastic microsphere or other lubricant are prepared enough in scene.
4) circulate: height carries, low flow resistance; Low suspension, low startup.
Every to stop circulation before, HY-2(sodium laurylsulfonate must be ensured) concentration (destructibility of accumulation body); Circulate in advance 1.2 ~ 1.5 weeks before stopping circulation; Finishing drilling circulation 2.0 weeks, and replace plastic microsphere.
5) rheological
1. compound drilling: lowly sticky to cut, high drilling speed
A, viscosity: >=45s.Φ600≥55。
B, gel strength: Φ 6 >=1.5; Φ 3 >=1.0.
C, yield value: >=5.0Pa.
D, turbulent flow: carry carefully, clean casting bed.
2. slipping drilling: in sticky to cut, middle drilling speed
A, viscosity: >=55s.Φ600≥65。
B, gel strength: Φ 6 >=1.5; Φ 3 >=1.0.
C, yield value:>=6.0Pa(60.0din/cm
2).
Carry carefully, clean well.
D, turbulent flow: carry carefully, clean casting bed.
(3) shielding circulation of drilling fluid technique is inlayed:
1) shielding circulation of drilling fluid process schematic representation is inlayed
Inlay shielding circulation of drilling fluid process schematic representation and see Fig. 7.
2) principle and operation
In drilling process, density enters vibratory screening apparatus higher than the drilling fluid of reservoir pressure coefficient and formation collapsed pressure coefficient, and the solid phase being greater than 0.9mm is removed; Enter mulling by the drilling fluid of vibratory screening apparatus and be pumped into desanding or desilt swirler, the drilling cuttings after centrifugation or be removed through the crushed shale of mulling pump, the solid load controlled in drilling fluid is not more than 5% usually; Drilling fluid after purification enters the recycle system; Add screened film drilling well powder or weighting agent at the dosing mouth place of setting, after dispersed with stirring, pump into pit shaft set up recirculation.
The drilling fluid water such as clear water, seawater, GEOTHERMAL WATER that A, needs supplement can supplement in No. 1 tank.
B, drilling well powder, weighting agent, lubrication bead, anti-H
2s agent etc. can add at No. 1 tank dosing mouth place.
C, plugging fluid, low sticky turbulent fluid are prepared in No. 2 tanks, will be separated during preparation with No. 1 tank.
When D, trip-out, the drilling fluid in well is supplemented by 1, No. 2 tank simultaneously; Time not enough, first supplement the fluid after drilling cuttings pond or the purification of desliming pond.If still not enough, then supplement the metal salt solution of equal densities or supplementary low density flow and add after metal-salt reaches density requirements again, property of drilling fluid is realistic in adjustment when requiring, the drilling fluid of additional well intraocular.
When E, lower brill, if the drilling fluid in well is full of 1, No. 2 tank, then unnecessary drilling fluid drains into drilling cuttings pond or desliming pond by overflow port.The fluid that drilling cuttings pond or desliming pond are separated reenters recirculation by vibratory screening apparatus.
Inlay shielding fluid maintenance:
(1) the removing of drilling cuttings and gas:
1) removing of >=0.9mm drilling cuttings
Drilling cuttings pond is expelled to, content≤0.1% by 20 order vibratory screening apparatuss.Must not expel liquid on oscillating screen.
2) the removing of 45um ~ 0.9mm drilling cuttings
Drilling cuttings pond is expelled to, content≤0.5% by sand fallout swirler.During sand fallout, swirler is discharged a small amount of liquid and enters drilling cuttings pond.Enter the liquid in drilling cuttings pond after sedimentation, again can reenter recirculation by vibratory screening apparatus.
3) removing of≤45um shale
Drilling cuttings pond is expelled to, content≤5.0% by cyclowass.During desliming, swirler is discharged a small amount of liquid and enters drilling cuttings pond.Enter the liquid in drilling cuttings pond after sedimentation, again can reenter recirculation by vibratory screening apparatus.Must not it should be noted that and draw back the recycle system containing the liquid of a large amount of shale.
A, Con trolling index:
A, sand fallout effect: the fluid after sand fallout measures containing sand instrument containing sand≤0.5%().
B, desliming effect: the fluid after desliming is containing mud≤5.0%(solid load determinator).
B, control method
A, sand fallout: adjustment enters the discharge capacity of each desanding swirler, survey containing sand to up to standard.
B, desliming: adjustment enters the discharge capacity of each desilt swirler, up to standard to solid content.
C, whizzer: solid content, by time still up to standard after swirler, removes solid phase with whizzer.
D, degassed: degassed with de-aerator, ensure the normal operation of pump.
4) in particular cases remove treatment process
Under the condition of normally creeping into, in any case adjustment, the sand in drilling fluid, mud, gas always do not reach design code requirement, then temporarily stop to bore, spudding up and down, special cycles individual curing (in most cases needing to increase the weight of pre-treatment).
(2) vena caval filter:
The fluid loss of strict control drilling fluid is significant to whole drilling process.If can control the fluid loss of drilling fluid from start to finish≤5.0ml/30min, then avoid pressure differential sticking, false filter cake bit freezing, slide be hampered, the accident such as casting bed compacting, had practical guarantee.
Control drilling fluid dehydration by two approach:
1) shale is regulated: under the condition that lubricity is more excellent
The size of A, reduction shale particle.During shale index >=8%, silt remover is selected to take off thick mud.
The content of B, increase shale.During shale index≤4%, sand separator is selected to take off thick mud and fine sand.
2) supplement inlay shielding drilling fluid, interpolation speed is 0.25 ~ 0.5%/1 week.
By aforesaid method, ensure fluid loss from start to finish≤5.0ml/30min.
(3) undergauge of mud shale section, collapsing and breaking and releasing is prevented:
The key of mud shale section undergauge, mud drum is aquation.The key of aquation is: the kind of pH value, metal ion and content, the macromolecular kind of organic or inorganic and content etc.Avoid and control aquation, significant to mud shale dispersion, hole shrinkage, bit balling, collapsing and breaking.
1) shale hydration, dispersion is controlled
A, guarantee to inlay screener content, maintain pH value≤7.5 simultaneously.
B, KCl or NH
4cl content>=3.0%.
2) prevent from caving in
A, guarantee to inlay screener content, reduce dehydration to≤5.0ml/30min.
B, raising drilling fluid proportion.D drilling fluid=1.05 ~ 1.10d caves in.
C, interpolation KCl or NH
4cl, content>=3.0%(comprise other metal-salt of equivalence).
(4) " false filter cake " undergauge of high seepage section, seepage and releasing is prevented:
The key of " false filter cake " undergauge is that dehydration is large; The key of seepage is that inlaying solid phase does not mate with the pore throat size on corresponding stratum.
1) " false filter cake " undergauge is prevented
A, reduce dehydration to≤5.0ml/30min, stop " false filter cake " to be formed.
B, drifting, wipe " false filter cake " supreme putting off and put without being hampered.
2) seepage is prevented
A, reduce dehydration to≤5.0ml/30min.Reduce Permeability.
B, raising shale index.Strengthen rigidity shielding.Content: 5.0 ~ 8.0%.
Accompanying drawing explanation
Fig. 1 illustrates prior art drilling fluid mechanism of action schematic diagram
Fig. 2 illustrates and inlays shielding drilling fluid mechanism of action schematic diagram
Fig. 3 illustrates that in embodiment 1, gained inlays the impact of screener A on dynamic and static shear force
Fig. 4 illustrates that in embodiment 2, gained inlays the Adjustment effect of screener B to dynamic and static shear force
Fig. 5 illustrates and inlays shielding drilling fluid oozes core shielding intensity to height
Fig. 6 illustrates and inlays shielding drilling fluid oozes core plugging effect to height
Fig. 7 illustrates and inlays shielding circulation of drilling fluid process schematic representation
Fig. 8 illustrates and inlays shielding drilling fluid sticking coefficient
Fig. 9 illustrates pressure transportation experiment result
Figure 10 illustrates rock core invasion depth experimental result
Figure 11 illustrates resume permeability experimental result
Embodiment
Further illustrate the present invention below by way of specific embodiment, but these embodiments are only exemplary, should not be construed as limitation of the present invention.
Embodiment 1 inlays the preparation of screener
Be that the quartz sand of 40-50 μm, 2000g acrylamide monomer, 260g benzoyl peroxide and 200g sodium lauryl sulphate are added to the water by 100g particle diameter, be warming up to 60 DEG C, react 3 hours, dry and obtain inlaying screener A.
Embodiment 2 inlays the preparation of screener
Screener B is inlayed in preparation in the same manner as in Example 1, and difference is only that use 100g particle diameter is the quartz sand of 100 μm.
Embodiment 3 inlays the preparation of screener
Be the quartz sand of 200-250 μm by 100 particle diameters, 1200g acrylamide monomer, 150g peroxidation trimethylacetic acid tertiary butyl ester and 100g triethyl hexyl phosphoric acid is added to the water, be warming up to 70 DEG C, react rear formation long chain polymer, dried and obtain inlaying screener C.
Embodiment 4 inlays the preparation of screener
Screener D is inlayed in preparation in the same manner as in Example 1, and difference is only to be warming up to 80 DEG C.
The preparation of embodiment 5 drilling fluid
4g is surpassed calcium, 4g is above-mentioned inlays screener A, 0.1gNH
4-PAN(is hydrolyzed polypropylene ammonium salt) and 91.9g saturated brine under the stirring velocity of 100r/min, prepare the dynamic mud cake of 3.5MPa, i.e. drilling fluid.
Comparative example 1
By 4%g wilkinite, 2g SMP-2(sulfonated-pheno-formoldehyde resin), 0.1g CMC(Walocel MT 20.000PV), 0.1g NH
4-PAN and 95g mixing of fresh water, add barite to d=1.25, prepares the dynamic mud cake of 3.5MPa, i.e. drilling fluid under the stirring velocity of 100r/min.
Scour resistance contrast experiment:
The scour resistance of testing example 5 and comparative example 1 respectively.
Scour medium is clear water; Rotating speed is 600r/min; Pressure reduction is 3.5MPa; Shearing rate is 1.5ms
-1.
The mud cake wherein used in comparative example 1 i.e. traditional wall building, can see comparative example 1 anti-scour without sediment motion time≤60min, after 58min, filtration rate obviously increases; And embodiment 1 anti-scour without sediment motion time >=120min, after 120min, filtration rate is still without considerable change.
Embodiment 6
Inlay screener B and the thin calcium mixing of 4.0g800 order by above-mentioned to 92g saturated brine, 4.0g, under the stirring velocity of 100r/min, prepare the dynamic mud cake of 3.5MPa, i.e. drilling fluid.
At room temperature test the core of Jianghan Petroleum College ＄ 25 × 80, experimental data, see Fig. 5, can see that to inlay the shielding drilling fluid shielding intensity of oozing core to height higher.
At room temperature test the core of resin bonded building sand ＄ 25 × 80, experimental data, see Fig. 6, can see that the plugging effect inlaying shielding drilling fluid is better.
SZ36-1-23 well oil-sand compacting core is used to carry out the higher core that oozes through mud and the difference of inlaying shielding drilling fluid.The micro-solid phase of mud, penetrates core, D:1.36; FL:3.6ml; Inlay the thick solid phase of shielding drilling fluid and do not penetrate core, D:1.05; FL:6.7ml.
Embodiment 7
By 88.9g fresh water, 3g salt, 0.2g NH
4cl, 4g be above-mentioned inlays screener C and 4g500 order surpasses calcium mixing, prepares the dynamic mud cake of 3.5MPa, i.e. drilling fluid under the stirring velocity of 100r/min.
Use this drilling fluid liquid to carry out pollution depth experiment to the basic, normal, high core that oozes, experimental data is as shown in table 1 below.
Table 1 drilling fluid oozes core pollution depth test card to basic, normal, high
Experiment proves: inlay shielding drilling fluid system to Ka≤3000 (10
-3× um
2) the pollution depth≤30mm of perviousness core.
The anti-150 DEG C of fresh-water drilling fluids of embodiment 8
By 79.5g fresh water, 3g wilkinite, 1gBaSO
4, 2g solid graphite lubricant, 3g polymeric alcohol lubricant, 4g emulsified bitumen, the above-mentioned screener A that inlays of 3gSMP-2,2.5g mix, and prepares the dynamic mud cake of 3.5MPa, i.e. drilling fluid under the stirring velocity of 100r/min.
Its performance as shown in Table 2 below
The performance of the anti-150 DEG C of fresh-water drilling fluids of table 2
The anti-150 DEG C of fresh-water drilling fluids of embodiment 9
By 77.5 fresh water, 5g wilkinite, 1gBaSO
4, 2g solid graphite lubricant, 3g polymeric alcohol lubricant, 4g emulsified bitumen, the above-mentioned screener D that inlays of 2gKFT-2,3gSMP-2,2.5g mix, and prepares the dynamic mud cake of 3.5MPa, i.e. drilling fluid under the stirring velocity of 100r/min.
Its correlated performance is as shown in table 3 below:
The performance of the anti-150 DEG C of fresh-water drilling fluids of table 3
The anti-120 DEG C of fresh-water drilling fluids of embodiment 10
By fresh water, 3g wilkinite, 1gBaSO
4, 2g solid graphite lubricant, 3g polymeric alcohol lubricant, 4g emulsified bitumen, 0.1g ammonium chloride, the above-mentioned screener A that inlays of 2.2g mix, and prepares the dynamic mud cake of 3.5MPa, i.e. drilling fluid under the stirring velocity of 100r/min.
Its correlated performance is as shown in table 4:
The performance of the anti-120 DEG C of fresh-water drilling fluids of table 4
The anti-120 DEG C of fresh-water drilling fluids of embodiment 11
By fresh water water, 5g wilkinite, 1gBaSO
4, 2g solid graphite lubricant, 3g polymeric alcohol lubricant, 4g emulsified bitumen, 0.1g ammonium chloride, the above-mentioned screener A that inlays of 2.2g mix, and prepares the dynamic mud cake of 3.5MPa, i.e. drilling fluid under the stirring velocity of 100r/min.
Its correlated performance is as shown in table 5:
The performance of the anti-120 DEG C of fresh-water drilling fluids of table 5
Being below the test data to inlaying screener correlated performance, more directly can being seen by these data and inlaying the advantage of screener compared to prior art.
test example
1, rheological and filtration property evaluation
In water, add gained in the embodiment 1 of different quantities respectively inlay screener A, measure the performance under room temperature, experimental result is in table 6.
The impact of screener on rheological and filtration property inlayed by table 6
Wherein, described percentage composition refers to the weight percentage based on water.
As can be seen from Table 6, inlay screener A and have good thickening and cut and filtrate reducing effect, dosage is larger, viscosity and shear force higher, filter loss is lower.When not adding other treatment agent any, adding separately in clear water and inlaying screener and just can obtain the viscosity of needs, shear force and filter loss.
2, heat-resisting property evaluation
Add respectively in tap water in the embodiment 1 of different quantities and inlay screener, measure the performance after room temperature and high temperature ageing, experimental result is in table 7.
Screener drilling fluid heat-resisting property inlayed by table 7
Wherein, described percentage composition refers to the weight percentage based on water.
As can be seen from Table 7, when experimental temperature is lower than 120 DEG C, raise viscosity and shear force with temperature and increase, filter loss reduces, but temperature more than 120 DEG C after, raise viscosity degradation with temperature, filter loss raises, and considering its temperature resistance ability is 130 DEG C.
3, layer of sand sealing characteristics is evaluated
3.1 experimental technique
(1) install in visual and press sand bed filtration instrument support and experiment pipeline;
(2) experimentally requirement, loads drilling fluid cup to (or empirically requiring selected sand amount) on 350ml scale marks, pours into and treat fluid measured by the sand of certain mass, different-grain diameter;
(3) drilling fluid cup to be placed on support and to cover tightly cover;
(4) air valve applies 0.7MPa pressure to fluid is opened;
(5) fluid leak-off 30min in layer of sand, observes infiltration leak-off situation;
(6) close source of the gas after 30min and lay down pressure;
(7) read and record the volume of filtrate in graduated cylinder, or read and record the degree of depth that filtrate invades layer of sand.
3.2 experimental result and discussion
Layer of sand shutoff experimental result is in table 8:
Table 8 layer of sand shutoff experimental result
Wherein, described percentage composition refers to the weight percentage based on water.
As can be seen from Table 8, increase with dosage, the effect of inlaying screener shutoff layer of sand improves, and when dosage is 3%, is all less than 10cm to the invasion depth of 40-60 order sand and 20-40 order sand, illustrates and inlay the ability that screener has stronger shutoff layer of sand.
4, caving-preventing characteristic evaluation
4.1 swell
4.1.1 experimental technique
(1) rock core prepares
1. in survey cylinder bottom, pad one deck filter paper, screw a bottom;
2. take 10g dry 4h at 105 ± 3 DEG C and be chilled to the wilkinite of room temperature, load and survey in cylinder, wilkinite is flattened;
3. install the sealing-ring on depression bar, depression bar is inserted and surveys in cylinder, be placed on uniform pressurization on pressing machine, until tensimeter indicates 4MPa, stablize 5min;
4. shed pressure, take off survey cylinder, depression bar is slowly taken out, with the original height H (mm) of vernier caliper measurement rock core in survey cylinder.
(2) swell
1. switch on power, start instrument, preheating 15min;
2., in the middle of two connecting rods survey cylinder installing rock core being installed to main frame, just put.Measuring staff is put into and surveys cylinder, make it and rock core close contact, insert center sensor bar in measuring staff upper end, the setting nut on adjustment centibar, makes numerical monitor be 0.00;
3. in survey cylinder, solution to be measured is filled, starting switch, writing time;
4. rock core expansion height Δ H (mm) is in time recorded;
5. close power supply, pull down and survey cylinder and measuring staff, clean up, receive and keep for subsequent use.
4.1.2 experimental result and discussion
Swell test results is in table 9.
Table 9 swell test results
Wherein, described percentage composition refers to the weight percentage based on water.
As can be seen from Table 9, add after inlaying screener, the expansion height of clay obviously reduces, and the hydration swelling inlayed screener and effectively can suppress clay is described.
4.2 rolling dispersion experiments
4.2.1 experimental technique
Whether the dispersing property of shale is stablized directly related with the borehole wall, and it is one of important indicator of macroscopic evaluation shale well wall stability, utilizes distributed test can understand the spray dispersing property of rock sample, also can as the inhibition evaluation means of drilling fluid to shale.Experiment concrete steps are as follows:
4.2.1.1 instrument
(1) roller furnace, rolling bottle; (2) 40 order sub-sieves; (3) balance: sensibility reciprocal is 0.1g; (4) air blast thermostatic drying chamber.
4.2.1.2 operation steps
(1) taking 50.0g(claims accurate to 0.1g) the air-dry mud shale sample of 2 ~ 5mm, load and fill in the rolling bottle of 350mL test solution, cover tightly.
(2) the rolling bottle that sample is housed is put into the mud roller furnace of 77 ± 1 DEG C, roll 16 hours.
(3) after constant temperature rolls 16 hours, take out high rolling bottle, be chilled to room temperature, the liquid in rolling bottle and rock sample are all poured on 40 order sub-sieves, then screening 1 minute in the groove containing tap water.
(4) will tail over rock sample put into 105 ± 3 DEG C air blast thermostatic drying chamber dry 4 hours, take out cooling, in atmosphere leave standstill 24 hours, then weigh.
(5) following formula is utilized to calculate rock sample dispersion rate of recovery R40:
R40＝m/50×100%
In formula: R40-rolls the dispersion rate of recovery ((mistake) 40 mesh screen residue)/%;
M-(crosses) 40 mesh screen residue rock sample weight/g.
4.2.2 experimental result and discussion
Experimental result is in table 10.
Table 10 landwaste recovery test result
Wherein, described percentage composition refers to the weight percentage based on water.
As can be seen from Table 10, inlay the screener rate of recovery all higher than the rate of recovery of clear water, illustrate that all there is very strong inhibition, can effectively improve the landwaste rate of recovery, be conducive to wellbore stability and reservoir protec-tion.
4.3 rock core immersion tests
4.3.1 experiment purpose
This test is by the integrated degree of visual inspection qualitative human rock core in different solutions after the immersion of certain hour, carrys out the rejection ability that different treatment agent is compared in qualitative examination.
4.3.2 experimental technique
Take 20g wilkinite to pour in rock core mould, be placed on pressing machine, be forced into 15MPa, take out after stablizing 10min, be placed in encloses container for subsequent use.
The rock core pressed carefully is put into test solution is housed, observe and record rock core situation over time.Result is as shown in table 11.
Table 11 rock core immersion test phenomenon describes
Wherein, described percentage composition refers to the weight percentage based on water.
As can be seen from above experimental result, inlay the dispersion that screener effectively can suppress rock core, its inhibition is better than 7%KCl far away.
5, antifouling property evaluation
5.1 sodium-chlor pollute experiment
Experimental result is in table 12.
Table 12 sodium-chlor pollutes experiment
Wherein, described percentage composition refers to the weight percentage based on liquid to be measured.
As can be seen from Table 12, add NaCl, cause drilling fluid viscosity and shear force to decline, filter loss rises.When inlaying screener dosage and being 2%, the filter loss after salt adding is all at more than 10ml, and shear force is very little; When inlaying screener dosage and being 3%, the high temperature ageing filter loss after salt adding is at about 10ml, and shear force increases to some extent.Therefore, although salt pair inlays shielding, drilling fluid can produce certain impact, adjusts property of drilling fluid by suitably increasing the dosage inlaying screener.
5.2 wilkinites pollute experiment
Experimental result is in table 13.
Table 13 wilkinite pollutes experiment
Wherein, described percentage composition refers to the weight percentage based on liquid to be measured.
As can be seen from Table 13, after adding wilkinite, drilling fluid viscosity, shear force decline and filter loss changes very little, illustrate that wilkinite does not substantially disperse in this drilling fluid.
6, Evaluation of Lubrication
Experimental result is shown in Fig. 8 and table 14 respectively.
Table 14 extreme boundary lubrication performance
| Sequence number | Liquid to be measured | Frictional coefficient |
| 1 | Screener is inlayed in water+2% embodiment 2 | 0.136 |
| 2 | Screener is inlayed in water+3% embodiment 1 | 0.124 |
Wherein, described percentage composition refers to the weight percentage based on liquid to be measured.
As can be seen from Fig. 8 and table 15, inlay shielding drilling fluid and there is good lubricity.
7, the slow pressure transfer effect evaluation of resistance
The SHM simulator utilizing China Petroleum Univ. (East-China) to develop voluntarily, evaluates slow pressure transmission (PT) performance of adaptive leak preventing and stopping agent resistance.During experiment, first set up initial differential pressure (P=P at the upper and lower two ends of rock sample
on-P
under), under condition constant on maintenance upstream pressure P, detected the dynamic pressure change of rock sample downstream fluid in real time by pressure transmitter and differential pressure pick-up, by the change size of downstream pressure, the capacity of water that the slow pressure of rock core resistance transmits can be judged.
Experiment rock sample is taken to Shengli Oil Field SHAHEJIE FORMATION mud shale, basis of microscopic observation, mud shale heterogeneity, there is microfracture.First under normal saline solution/rock sample/normal saline solution action condition, carry out PT experiment, and measure the rate of permeation of rock sample; Then utilize HTHP dynamic filtration instrument, use adds the fluid inlaying screener in 3% embodiment 1 and carries out shutoff to rock sample, then carries out PT experiment under normal saline solution/rock sample (after shutoff)/normal saline solution action condition.Experimental result is shown in Fig. 9.
As seen from Figure 9, mud shale is after inlaying screener shutoff, and slowly, the effect that prevention fluid permeates in stratum clearly, proves that inlaying screener defines an effective plugging film at rock sample shutoff end to the increase of rock sample downstream pressure.
8, formation protection performance evaluation
(1) invasion depth experiment
Adopt artificial cores, move leak-off experiment with adding the fluid High Temperature High Pressure of inlaying screener in 3% embodiment 1, experiment condition is pressure reduction 3.5MPa, temperature 120 DEG C, shearing rate 100s
-1, the leak-off time is 60min.Constant pressure in leak-off process, after having tested, observe the degree of depth of solid invasion rock core, experimental result is shown in Figure 10.
As seen from Figure 10, inlay shielding drilling fluid and have stronger shut-off capacity, energy quick blocking rock core hole, makes the mud filtrate invasion rock core degree of depth be less than 2mm.
(2) resume permeability rate experiment
Adopting artificial cores, with adding the fluid inlaying screener in 3% embodiment 1, pollution evaluation experiment being carried out to core.Pollution experiment condition is: pressure reduction 3.5MPa, temperature 80 DEG C, shearing rate 100s
-1, pollute time 60min.When measuring the rate of permeation before and after polluting, constant pressure, resume permeability rate experimental result is shown in Figure 11.
As seen from Figure 11, inlay shielding drilling fluid and have stronger reservoir protec-tion ability, recovery of core permeability is greater than 95%.
(3) plugging strength evaluation experimental
Shutoff band strength is larger, more can stand the impact of surge pressure, and plugging effect is better; on the contrary, shutoff band strength is lower, under the impact of surge pressure; more easily cause shutoff band to be broken, thus produce new leak-off, do not reach the object of the protection borehole wall and oil reservoir.Getting the artificial cores of different rate of permeation, testing with adding the fluid inlaying screener in 3% embodiment 1, evaluate plugging strength by the rate of permeation measured under different displacement pressure, experimental result is in table 165.
Table 15 is stifled intensity evaluation experiment temporarily
As can be seen from Table 15, with the increase of displacement pressure, the rate of permeation of rock core reduces gradually, when displacement pressure reaches 9MPa, the rate of permeation of core is close or equal zero, that is, when pressure is 9MPa, have no rate of permeation to increase suddenly, illustrate that shutoff band is not damaged, the shutoff band that different rate of permeation rock core is formed at least can bear the pressure of 9MPa.
(4) plugging permeable rate scope is evaluated
Inlay screener, to the oil reservoir that different pore size distributes, all there is good plugging action in order to evaluate, use artificial cores, dynamic filtration analogue experiment installation and rock core-flowage experiment instrument, according to assessment process, employing adds the fluid inlaying screener in 3% embodiment 1 and has carried out shutoff experiment to the core of different rate of permeation respectively, and experimental result is in table 16
Table 16 blocks effect assessment experiment
As can be seen from Table 16, drilling fluid all has good plugging action to the core of different rate of permeation, after shutoff, the rate of permeation plugging rate of core is more than 90%, prove inlay screener and inlay screener composite can within the specific limits to different pore size distribution oil reservoir produce good plugging action, overcome the dependence of traditional temporary shielding method ,barrier building temporary seal incores formation pore dimension, demonstrate good self-adaptive features.
Can see that shielding drilling fluid tool of inlaying of the present invention has the following advantages by above-mentioned specific embodiment and correlation test:
(1) inlay screener to have good thickening and cut and filtrate reducing effect, dosage is larger, viscosity and shear force higher, filter loss is lower; When not adding other treatment agent any, adding separately in clear water and inlaying screener and just can obtain the viscosity of needs, shear force and filter loss.
(2) when experimental temperature is lower than 120 DEG C, inlay shielding drilling fluid following temperature and raise viscosity and shear force increase, filter loss reduces, but temperature more than 120 DEG C after, raise viscosity degradation with temperature, filter loss slightly raises, and considers its temperature resistance ability in fresh water and can reach 130 DEG C.
(3) increase with inlaying screener dosage, the effect of inlaying shielding drilling fluid shutoff layer of sand improves, and when dosage is 3%, is all less than 10cm to the invasion depth of 40-60 order sand and 20-40 order sand, illustrates and inlay the ability that screener has stronger shutoff layer of sand.
(4) inlaying shielding drilling fluid can effectively suppress the aquation of the hydration swelling of clay, landwaste to be disperseed and the caving in of rock core, and has good caving-preventing characteristic, is conducive to wellbore stability.
(5) inlaying shielding drilling fluid can effective shutoff core, and plugged zone invasion depth is little, and plugging strength is high, and resume permeability rate is high, is conducive to formation protection.
(6) utilize multifunctional visible to dissolve well fluids Simulation system, having carried out visual shutoff experiment to inlaying shielding drilling fluid, having proved that inlaying shielding drilling fluid has good plugging action to middle and high infiltration and low permeability formation.
(7) theoretical analysis inlays the viscosifying mechanisms of screener, filtrate reducing mechanism, mechanism of anti caving and reservoir protec-tion mechanism.
(8) inlay shielding drilling fluid and carried out rig-site utilization at Cheng913Jing, not relevant with drilling fluid complexcase, wellbore construction is smooth, decreases rejected well drilling liquid discharge, achieves good construction effect.
More than in conjunction with embodiment and exemplary example to invention has been detailed description, but these explanations can not be interpreted as limitation of the present invention.It will be appreciated by those skilled in the art that when not departing from spirit and scope of the invention, can carry out multiple equivalencing, modification or improvement to technical solution of the present invention and embodiment thereof, these all fall within the scope of the present invention.Protection scope of the present invention is as the criterion with claims.
Claims (10)
1. inlay a shielding drilling fluid, comprise the component of following weight content:
Inlay screener, 0.2%-8.5%,
Tackifier, 0-5%,
Weighting agent, 0-8%
Liquid based on surplus,
Wherein, described weight content refers to that described component is based on the weight percent inlaying shielding drilling fluid gross weight.
2. inlay shielding drilling fluid as claimed in claim 1, it comprise weight content be 2%-5% inlay screener, described weight content refers to inlays screener based on the weight percent inlaying shielding drilling fluid gross weight.
3. inlay shielding drilling fluid as claimed in claim 1, it comprises the tackifier that weight content is 1%-5%, and described weight content refers to that tackifier are based on the weight percent inlaying shielding drilling fluid gross weight.
4. inlay shielding drilling fluid as claimed in claim 1, it comprises the weighting agent that weight content is 1%-8%, and described weight content refers to that weighting agent is based on the weight percent inlaying shielding drilling fluid gross weight.
5. inlay shielding drilling fluid as claimed in claim 1, wherein, described basal liquid is fresh water, local area backflow sewage, salt solution or seawater.
6. inlay shielding drilling fluid as claimed in claim 1, wherein inlay screener and prepare by the following method:
100 weight part rigid inorganic kernels, 500-2600 weight parts monomers, 50-300 weight part initiator and 30-300 parts per weight dispersing agent etc. are added to the water, are warming up to 60 DEG C-90 DEG C, have reacted rear formation long chain polymer, dry and obtain inlaying screener;
Wherein, described rigid inorganic kernel is selected from quartz sand or silicate minerals;
Described monomer is acrylamide,
Described initiator is selected from: acyl class superoxide is as benzoyl peroxide, lauroyl peroxide etc., or ester class superoxide is as peroxidized t-butyl perbenzoate, peroxidation trimethylacetic acid tertiary butyl ester;
Described dispersion agent is selected from triethyl hexyl phosphoric acid, sodium lauryl sulphate, methyl amyl alcohol or guar gum etc.
7. inlay a screener, as recited in claim 6, its size distribution is 4 ~ 400 μm, and preferred median size is at about 50 μm.
8. inlay the purposes of screener for drilling fluid as claim 6 or 7.
9. inlay shielding drilling fluid as claimed in claim 1, wherein weighting agent is solubility salt, comprises inorganic salt and organic salt, preferred NH
4cl, KCl, KHCO
3, NaCl, MgCl
2, CaCl
2, ZnCl
2, ZnBr
2deng, more preferably NH
4cl, KCl, KHCO
3;
And/or
Tackifier are resol class organic high molecular polymer.
10. inlay shielding drilling fluid as claimed in claim 1, also comprise one or more other auxiliary agents, described auxiliary agent can be lubricant, and described lubricant can be solid lubricant or liquid lubricant.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111303842A (en) * | 2019-12-05 | 2020-06-19 | 西南石油大学 | Deep crack lost stratum seam hole transformation leakage-proof plugging and reservoir protection material |
| CN115975609A (en) * | 2021-10-15 | 2023-04-18 | 中石化石油工程技术服务有限公司 | Preparation method and application of high-density solid-free weighting agent |
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| CN104419388B (en) | 2018-07-20 |
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