CN105199685A - Water-based drilling fluid for leakage protection and sealing of induced fissures - Google Patents
Water-based drilling fluid for leakage protection and sealing of induced fissures Download PDFInfo
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- CN105199685A CN105199685A CN201510608110.0A CN201510608110A CN105199685A CN 105199685 A CN105199685 A CN 105199685A CN 201510608110 A CN201510608110 A CN 201510608110A CN 105199685 A CN105199685 A CN 105199685A
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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
- 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
- C09K8/14—Clay-containing compositions
- C09K8/18—Clay-containing compositions characterised by the organic compounds
- C09K8/22—Synthetic organic compounds
- C09K8/24—Polymers
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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
- C09K8/42—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells
- C09K8/46—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement
- C09K8/467—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement containing additives for specific purposes
- C09K8/487—Fluid loss control additives; Additives for reducing or preventing circulation loss
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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
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/18—Bridging agents, i.e. particles for temporarily filling the pores of a formation; Graded salts
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- Dispersion Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Sealing Material Composition (AREA)
Abstract
The invention relates to water-based drilling fluid for leakage protection and sealing of induced fissures. The water-based drilling fluid is prepared from polyacrylamide, sulfonated bitumen, a filtrate reducer, a polymer gel lost circulation agent, a bridge plug lost circulation agent, rubber particles, a one-way pressure blocking agent, saw dust, mica, vermiculite, an alkalinity control agent and water. By means of the water-based drilling fluid for leakage protection and sealing of the induced fissures aims, according to the practical problems that the induced fissures change and a conventional bridging lost circulation agent is small in blocking range, an elastic lost circulation material, a complex micelle polymer and a packing material leakage protection and sealing agent are studied and selected and can generate an effective blocking effect on wide-dimension fissures, the dependency on the dimension of a leakage channel by a traditional bridging lost circulation agent is overcome to a certain degree, the success rate to the leakage protection and sealing of the induced fissures is increased, the loading capacity reaches 4 mPa, a leaking layer can be effectively blocked within short time, and the leakage protection and sealing effect is achieved.
Description
Technical field
The invention belongs to drilling fluid field, particularly the water-base drilling fluid of a kind of inducibility crack leak-proof leak-stopping.
Background technology
Leakage affects one of the most serious complexcase of the harm of drilling operation safety, and the generation of leakage not only can bring loss to drilling engineering, also for the exploratory development of hydrocarbon resources brings extreme difficulties.Circulation problems is the major engineering problems of the domestic and international petroleum prospecting of puzzlement, exploitation always, fails so far to solve completely, and current most widely used bridge joint plugging agent accurately must grasp formation pore or flaw size.But inducibility crack often distribution area is wide, flaw size is difficult to accurately grasp, more undesirable to its plugging effect.
For China's celebrating oil field, since 2008, circulation problems is more and more outstanding, there is absorption well quantity, wastage, leakage time, leak-off losses increase, China's celebrating oil field major part is the permeability loss on sandstone and Yijun stratum, river, Lip river, disposable leak stopping success ratio does not reach 80%, and year leakage financial loss exceedes millions of unit.In first 284 block construction processs, also there occurs more than ten secondary serious leakages, leak stopping success ratio, less than 50%, loses upper 1,000,000 yuan.
Due to inducibility crack, often distribution area is wide, and flaw size is difficult to accurately grasp, and conventional bridge joint plugging agent shutoff narrow range, therefore, more undesirable to the plugging effect in inducibility crack.
Summary of the invention
The object of the invention is the practical problems for the change of inducibility crack and conventional bridge joint plugging agent shutoff narrow range, provide a kind of and both there is very strong adaptability, there is again the leak-proof leak-stopping drilling fluid of good rheological.
For this reason, the invention provides the water-base drilling fluid of a kind of inducibility crack leak-proof leak-stopping, comprise the material of following weight per-cent:
A, polyacrylamide: 0.3% ~ 0.5%;
B, sulfonated gilsonite: 0.5% ~ 0.6%;
C, fluid loss agent: 0.3% ~ 0.5%;
D, polymer gel plugging agent: 0.2% ~ 0.3%;
E, pons hematoma agent: 0.3% ~ 0.5%;
F, rubber grain: 2% ~ 3%;
G, uniaxial pressure plugging agent: 0.1% ~ 0.2%;
H, sawdust: 0.5% ~ 0.8%;
I, mica: 0.3 ~ 0.5%;
J, vermiculite: 0.3 ~ 0.6%;
K, alkalinity control agent: 0.3% ~ 0.5%;
Surplus is water.
This drilling fluid is carried out according to following program at normal temperatures and pressures by the compound of aforementioned proportion:
L) clear water of said ratio is loaded at the scene in slurry commanding tank;
2) polyacrylamide of said ratio, sulfonated gilsonite, fluid loss agent are added in clear water successively mix;
3) add the polymer gel plugging agent of aforementioned proportion again, stir and make it fully dissolve;
4) the pons hematoma agent of aforementioned proportion, rubber grain, sawdust, mica, vermiculite, uniaxial pressure plugging agent is added again respectively, stirring and dissolving;
5) add alkalinity control agent and PH is adjusted to 9 ~ 10.
Described polymer gel plugging agent is the inorganic salt that can provide potassium ion or sodium ion.
Described polymer gel plugging agent is Repone K or sodium chloride or saltpetre.
Described individual event pressure plugging agent is particle diameter is 300 ~ 800 object calcium carbonate superfine powders.
Described alkalinity control agent is sodium hydroxide or potassium hydroxide.
Described pons hematoma agent size distribution is
15 ~ 20% particle diameter 0.05 ~ 0.1mm;
20 ~ 25% particle diameter 0.1 ~ 0.2mm;
15 ~ 20% particle diameter 0.2 ~ 0.3mm;
5 ~ 15% particle diameter 0.3 ~ 0.4mm;
5～10%QD—2；
1 ~ 5% particle diameter 0.4 ~ 0.5mm.
Described rubber grain size distribution is
30 ~ 40% particle diameter 0.01 ~ 0.1mm;
20% ~ 30% particle diameter 0.1 ~ 0.3mm;
20% ~ 30% particle diameter 0.3 ~ 0.5mm.
Described fluid loss agent is cellulose sodium salt.
Beneficial effect of the present invention: the water-base drilling fluid of this inducibility crack of the present invention leak-proof leak-stopping, for the change of inducibility crack and the practical problems of conventional bridge joint plugging agent shutoff narrow range, grind and select elasticity patching materials, composite micella polymkeric substance and packing material leak-proof sealing agent can produce effective plugging action to wider sized fractures, overcome traditional bridge joint plugging agent to a certain extent to the dependence of leakage channel size, improve the success ratio to inducibility crack leak-proof leak-stopping, bearing capacity reaches 4mPa, can within a short period of time effective shutoff drop ply, play the effect of leak-proof leak-stopping.
Embodiment
Embodiment 1:
The present embodiment provides the water-base drilling fluid of a kind of inducibility crack leak-proof leak-stopping, comprises the material of following weight per-cent:
A, polyacrylamide: 0.3% ~ 0.5%.
B, sulfonated gilsonite: 0.5% ~ 0.6%.
C, fluid loss agent: 0.3% ~ 0.5%.
D, polymer gel plugging agent: 0.2% ~ 0.3%,
Polymer gel plugging agent is the inorganic salt that can provide potassium ion or sodium ion, and here polymer gel plugging agent can be Repone K or sodium chloride or saltpetre.
E, pons hematoma agent: 0.3% ~ 0.5%,
Pons hematoma agent size distribution is:
15 ~ 20% particle diameter 0.05 ~ 0.1mm;
20 ~ 25% particle diameter 0.1 ~ 0.2mm;
15 ~ 20% particle diameter 0.2 ~ 0.3mm;
5 ~ 15% particle diameter 0.3 ~ 0.4mm;
5～10%QD—2；
1 ~ 5% particle diameter 0.4 ~ 0.5mm.
F, rubber grain: 2% ~ 3%,
Rubber grain size distribution is:
30 ~ 40% particle diameter 0.01 ~ 0.1mm;
20% ~ 30% particle diameter 0.1 ~ 0.3mm;
20% ~ 30% particle diameter 0.3 ~ 0.5mm.
Described fluid loss agent is cellulose sodium salt.
G, uniaxial pressure plugging agent: 0.1% ~ 0.2%;
Here individual event pressure plugging agent is particle diameter is 300 ~ 800 object calcium carbonate superfine powders.
H, sawdust: 0.5% ~ 0.8%.
I, mica: 0.3 ~ 0.5%.
J, vermiculite: 0.3 ~ 0.6%.
K, alkalinity control agent: 0.3% ~ 0.5%,
Alkalinity control agent is sodium hydroxide or potassium hydroxide;
Surplus is water.
This drilling fluid is carried out according to following program at normal temperatures and pressures by the compound of aforementioned proportion:
L) clear water of said ratio is loaded at the scene in slurry commanding tank;
2) polyacrylamide of said ratio, sulfonated gilsonite, fluid loss agent are added in clear water successively mix;
3) add the polymer gel plugging agent of aforementioned proportion again, stir and make it fully dissolve;
4) the pons hematoma agent of aforementioned proportion, rubber grain, sawdust, mica, vermiculite, uniaxial pressure plugging agent is added again respectively, stirring and dissolving;
5) add alkalinity control agent and PH is adjusted to 9 ~ 10.
The blocking constructing process of this drilling fluid of the present embodiment is as follows:
1, carry out the collection visiting data before and after liquid level and leakage, accurately judge drop ply.
2, comprehensively analyze according to leakage situation and drop ply character, determine adaptability leak-proof sealing agent type, concentration and outfit quantity, leak stopping pulp density should close to the well pulp density crept into.
3, the bentonite slurry of selection well slurry or 3-6% is leak stopping base slurry as required, and base slurry viscosity and shear force are wanted suitably, and control funnel viscosity and density are advisable.
4, under the slurry commanding tank continuous stirring condition of ground, 5 ~ 10% adaptability leak-proof sealing agents are added by electrodynamic funnel.Amount of preparation should to miss stratum pressure-bearing, and leak fast size, leakage channel shape, segment length and size of the hole etc. and comprehensively determine, usual scope is 20 ~ 50m
3/ time.
5, polish drill rod or the drilling tool with large hydrophthalmia is adopted) down to 10 ~ 50m position, drop ply top, pump into the leak stopping prepared and starch to missing interval, injection rate is all covering drop ply section and add 2 ~ 10m
3leak stopping slurry amount, normally 10 ~ 25m
3.
6, for leaking, speed is little, pit shaft easily well that is full and not easily pressure differential sticking, under the condition that conditions down-hole allows, do not rise and be drilled into escape pit section, close preventer and improve bearing capacity, control annulus pressure and can not exceed well head and formation-parting pressure at 0.5 ~ 5MPa(), after energy voltage stabilizing 10 ~ 30min, drive a well and rush down pressure, rise and be drilled into the full drilling fluid of escape pit section tank, static 4 ~ 6 hours; , pit shaft serious for leakage be full and well that pressure reduction is high not easily, rises and is drilled into escape pit section, close preventer and improve Formation bearing pressure.Build the pressure if start and do not reach preset value, gradation can be adopted to clamp-on the way of drilling fluid, successively leak stopping slurry is clamp-oned leakage stratum.If repeatedly build the pressure in process, casing pressure is high time by time, just shows there is good plugging effect.
7, the amount that leak stopping slurry enters stratum should be 2/3 of injection rate to all.If leak stopping slurry not easily enters stratum, be anti-" sealing up a door " phenomenon, must take gap method extruding, interval time is 10 ~ 30min.
8 if voltage stabilizing, answers gate ring pressure to be 0.5 ~ 5MPa, and after static more than 4h, under be drilled into absorption well section top, turn on pump circulating fluid leak test.
9, for the well of absorption well segment length, can adopt and inject the relatively large leak stopping slurry of full well section, carry out covering possible total loss well section.
The present invention is directed to the limitation of conventional bridge joint plugging agent, propose and adapt to the thinking of leak-proof leak-stopping, grind and selected composition adapt to resilient particulate materials, the micellar copolymerization thing of leak-proof sealing agent and fill strengthening agent, preferred leak-proof sealing agent and drilling fluid composition thereof.
Resilient material has good elasticity, has certain expansion filling and the dual function of inner jam-packed compacting after making it enter drop ply; There is certain deformability, hole or the crack with different shapes and size can be adapted to.Above feature makes elastic granule have the dual-use function of bridge formation and filling simultaneously.Under the effect of pressure reduction, after the elastic granule being less than formation pore size or fracture width enters hole, produce shutoff by bridge formation Filling Principle; The elastic granule being greater than formation pore diameter or fracture width enters hole by crimp, then produces expansion packing action by stronger elastic contribution to hole or crack, thus produces good plugging action to hole or crack.The These characteristics of resilient particulate materials, overcoming conventional bridging material can only by the defect of bridge formation filling and blocking drop ply, adaptation wider.In actual application, when drop ply hole or flaw size the unknown, can use the elastic granule leak stopping of large-size, pore diameter is greater than to the comparatively macrovoid of elastic granule diameter, elastic granule plays plugging action by bridge formation filling; Pore diameter is less than to the smaller aperture of elastic granule diameter, elastic granule plays plugging action by crimp and expansion filling.
When micellar copolymerization thing joins in water-base drilling fluid, can adsorb in a large number rapidly in solid-liquid interface, when reaching threshold concentration, polymkeric substance associates at rock surface, forms micella.Along with the increase of concentration, micellar copolymerization thing forms a large amount of micella solid-liquid interface (borehole wall) is upper, and micella can rely on its interface suction to develop between micella to associate, thus forms plugged zone at rock surface, shutoff formation pore or microfracture.
Fill the effect of reinforcement material: under the effect of pressure reduction, fill reinforcement material and enter the plugged zone microporosity formed by resilient material and polymer micelle, be conducive to the rate of permeation reducing plugged zone further, strengthen the intensity of plugged zone, improve the bearing capacity of plugged zone.In actual plugging operations process, the resilient particulate materials of large-size can first to hole or crack generation shutoff to a certain degree, micellar copolymerization thing is by micelle formation new plugged zone on this basis, fill strengthening agent enters the plugged zone formed by resilient material and micellar copolymerization thing microporosity by filling effect, the rate of permeation of further reduction plugged zone, strengthens the intensity of plugged zone.
By the synergy of above-mentioned three kinds of materials, leak-proof sealing agent has broken away from the constraint of bridge formation filling theory to a great extent, there is good adaptive character, it is made to have hole or the crack of different shapes and size at endoadaptation in a big way, solve the selection effect of drop ply to leak-proof leak-stopping material to a certain extent, compensate for the defect that conventional plugging agent grain composition is difficult to reach reasonable request.Particularly ensure that ground, shaft bottom is clean, ensure that downhole safety, saved drilling cost.
Below in conjunction with embodiment, the invention will be further described, but following embodiment is not used in restriction practical range of the present invention.
River, Changqing oilfields Ordos Basin Lip river thin layers of mudstone landwaste microfracture, flaw size are mainly in 0.693mm-2.327mm scope, and seriously expand after 24 hours through soak at room temperature, reach 3.698mm-5.012mm, amplification degree is up to 114%-434%.Cause occurring in drilling process developing into large-scale, super-huge leakage by small-sized or moderate leakage.
Embodiment 2:
Qingtongxia sodium soil 12%+NaOH0.6%+Na2CO30.4%+QD-22%+QD-order rice stone 3%+5-20, order rice stone 6%+5-8,36%+3mm rubber grain 3%+5mm rubber grain 4%+8mm rubber grain 3%+CDL-10.5%+2-4 order rice stone 5%.
Unit 303-54 well leak stopping rig-site utilization: leakage well depth 600-770m, the layer position of leakage is the leakage of Luo He group multiple spot, and leak-off velocity is at 40-60m
3/ h, wastage is at 450m
3.
July 12,23:00 bis-opens, and creeping into 600 meters has suddenly severe leakage into the not property returned.At spudding up and down, join pons hematoma slurry 40m
3after at the bottom of Injection Well, turn on pump 50 seconds, has mud 1/2 amount to return out, replys and creep into after circulation is normal.July 13,12:00 well depth 670-700 rice liquid measure reduced gradually, and wastage strengthens, and does not return when creeping into 727 meters of turn on pump mud that make up a joint, and started to pull out of hole.After well head drops into cotton boll+sawdust, join leak stopping slurry 40m
3pour in well, liquid level returns out from well head.July 14,4:00 started static leak stopping; July 14 bored under 12:00, had mud to return out well head.July 14 got into about 717 meters under 14:30, and turn on pump circulating mud returns out normally, creeps into 2 meters miss again and do not return when making up a joint, and leaked speed at 40m
3/ h; July 14,16:00 crept into 737 meters of trip-outs.July 15,3:00 injected grout leak stopping, cement No. 425 5 tons.Coagulated to July 17 from July 15.
The leak stopping of application on July 17 leak-proof leak-stopping drilling liquid technology.11:00 starts to join leak stopping slurry 60m
3, with getting into 590 meters at present, first carried out one and singlely to have crept into, leakage leak stopping slurry 40m
3; 12:00 joins leak stopping slurry 50m again
3, repeatedly inject 30m several times
3after leak stopping slurry, drill-hole returns, rises and is drilled into table cover footing, close preventer and carry out bearing capacity construction, injects 10m through repeatedly opening backwater turn on pump
3vertical being pressed onto of well head reaches 1MPa, and 16:00 completes blocking construction, and the full wellhead drilling fluid of tank starts static; Observe well head after 1 hour and cannot see liquid level, continue to enter drilling fluid to well head at well head tank, after static, lose liquid level again.In view of aboveground leakage reduces, carry out second step leak stopping.Get into about 710 meters under 20:00 starts, start blocking construction, inject leak stopping slurry 10m
3drill-hole returns, started after termination of pumping to be drilled into table cover pin, closed preventer and carry out Formation bearing pressure construction, small displacement repeatedly injects leak stopping slurry 10m
3, standpipe pressure rises to 3MPa gradually; July 18,0:30 was static, completed blocking construction.July 18 got into 720 meters, the end under 4:30-7:30, and turn on pump circulating fluid returns out, recovered to creep into after spudding up and down circulates one week, removed 108 hours complexity.Later stage, this well there occurs spinning cones off accident, through the multiple trips of accident settlement and the construction of well filling sidetracking, the situation that drilling fluid do not return all did not occur.
Embodiment 3:
Qingtongxia sodium soil 10%+NaOH0.5%+Na2CO30.3%+QD-23%+QD-order rice stone 5%+5-20,35%+5mm rubber grain 2%+8mm rubber grain 1%+CDL-10.5%+2-4 order rice stone 4%.
Unit 307-55 well leak stopping rig-site utilization:
Leakage well depth 572-1020m, the layer position of leakage is the leakage of Luo He group multiple spot, and leak-off velocity is at 30-50m
3/ h, wastage is at 600m
3.This well has liquid measure to return out, and construction drilling team does not attach great importance to, and adopts the method leak stopping that lost circulation additive is crept into.
August 5,21:00 clear water two was opened, and 11:20 crept into 572 meters and had suddenly severe leakage into the not property returned August 7.Rise and get into table cover angle, join pons hematoma slurry 20m
3after at the bottom of Injection Well, pour into 12 minutes 10m at well head
3drilling fluid is not poured into well head; Get into shaft bottom under starting after static 3 hours, turn on pump 12 minutes drilling fluids return output 1/3, and little time large when returning output.1:00 rose and got into table cover pin August 8; Join after at the bottom of pons hematoma slurry 30m3 Injection Well, well head returns output 1/3-1/2, again joins leak stopping slurry 30m
3after at the bottom of Injection Well, turn on pump returning fluid amount is normal; August 9,11:00 pulled out of hole static 7.30 hours, and August 9 got into 562 meters under 18:00, and turn on pump returned out after 6 minutes, started to change partial circulating leak stopping slurry and crept into; Crept into 950 meters on August 11 to change systemic circulation and creep into.August 12,11:00 crept into 1020 meters of leakages seriously, does not stop feed flow, creep into plugging agent lost circulation additive with 2 inches of water pumps; August 14,24:00 crept into 1410 meters, pulled out of hole without drilling fluid.
The leak stopping of application on August 15 leak-proof leak-stopping drilling liquid technology.13:30 joins leak-proof leak-stopping slurry 20m
3, same polish drill rod to 700 at present meter (the absorption well section according to aboveground leakage operating mode judges), injects 20m at twice
3after, well head returns out drilling fluid, rises to be drilled into table cover footing turn on pump 4 minutes liquid measures and to return out, and full drilling fluid to the well head of tank starts static 6 hours, and 17:00 pulls out of hole.August 15,23:30 prepared lower boring.Got into the end under 2:30 on August 16 to carry out turn on pump circulating fluid and return out, spudding up and down circulates, and recovers to creep into.
Embodiment 4:
Qingtongxia sodium soil 10%+ sulfonated gilsonite powder 0.2%+NaOH0.2%+QD-24%+QD-35%+3mm rubber grain 2%+5mm rubber grain 2%+CDL-10.2%.
Unit 297-68 well leakproof rig-site utilization:
Leakage well depth 560-760m, the layer position of leakage is the leakage of Luo He group multiple spot, and leak-off velocity is at 10-30m
3/ h, wastage is at 300m
3.Because about 560 meters, Luo He group stratum has microfracture to miss, leakage is when adopting conventional lost circulation additive not take effect, the lost circulation additive of application leak-proof leak-stopping drilling liquid technology, drills absorption well section with brill leak-proof leak-stopping, has stopped the expansion of wastage aggravation and microfracture.
July 22,14:00 clear water two was opened, and 12:00 crept into 560 meters of drill-hole returns amounts and reduced to half July 23.Add high sticky plugging agent, PAM, mixing plugging agent and CMC material at upper water pot immediately and carry out lost circulation additive; 21:00 well depth 700 is missed and is not also reduced, and 23:00 starts application with brill leak-proof leak-stopping drilling liquid technology, adds mixing plugging agent, PAM, CMC and wilkinite patching materials at upper water pot, preparation leak-proof leak-stopping slurry 20m
3leak stopping; July 24 3:00 well depth 760 meters, start to inject the lost circulation additive slurry prepared and creep into, well head returning fluid amount increases gradually, and wastage reduces, and well head liquid measure is returned out normally gradually.The 895 meters of recoveries of 8:00 well depth on July 25 are normally crept into.
July 23,12:00 added patching materials at upper water pot, repeated multiple times add plugging agent after, drill-hole returns has the trend reduced gradually, and 21:00 returning fluid amount does not increase, and the time of the turn on pump returning fluid amount that makes up a joint is also in lengthening.23:00 starts application with brill leak-proof leak-stopping drilling liquid technology, adds mixing plugging agent, PAM, CMC and wilkinite patching materials at upper water pot, and preparation leak-proof leak-stopping slurry 20m3 starts leak stopping; July 24 15:00 well depth 760 apply lost circulation additive construction creep into.The 3:00-7 month 25 July 24 8:00 carries out creeping into 895 meters with brill leak-proof leak-stopping drilling liquid technology, and well head returning fluid amount recovers normal, only drills absorption well section with 29 hours, reaches and normally creep into.
In sum, the water-base drilling fluid of this inducibility crack of the present invention leak-proof leak-stopping, for the change of inducibility crack and the practical problems of conventional bridge joint plugging agent shutoff narrow range, grind and select elasticity patching materials, composite micella polymkeric substance and packing material leak-proof sealing agent can produce effective plugging action to wider sized fractures, overcome traditional bridge joint plugging agent to a certain extent to the dependence of leakage channel size, improve the success ratio to inducibility crack leak-proof leak-stopping, bearing capacity reaches 4mPa, can within a short period of time effective shutoff drop ply, play the effect of leak-proof leak-stopping.
More than exemplifying is only illustrate of the present invention, does not form the restriction to protection scope of the present invention, everyly all belongs within protection scope of the present invention with the same or analogous design of the present invention.
Claims (9)
1. a water-base drilling fluid for inducibility crack leak-proof leak-stopping, is characterized in that: the material comprising following weight per-cent:
A, polyacrylamide: 0.3% ~ 0.5%;
B, sulfonated gilsonite: 0.5% ~ 0.6%;
C, fluid loss agent: 0.3% ~ 0.5%;
D, polymer gel plugging agent: 0.2% ~ 0.3%;
E, pons hematoma agent: 0.3% ~ 0.5%;
F, rubber grain: 2% ~ 3%;
G, uniaxial pressure plugging agent: 0.1% ~ 0.2%;
H, sawdust: 0.5% ~ 0.8%;
I, mica: 0.3 ~ 0.5%;
J, vermiculite: 0.3 ~ 0.6%;
K, alkalinity control agent: 0.3% ~ 0.5%;
Surplus is water.
2. the water-base drilling fluid of inducibility crack as claimed in claim 1 leak-proof leak-stopping, is characterized in that: this drilling fluid is carried out according to following program at normal temperatures and pressures by the compound of aforementioned proportion:
L) clear water of said ratio is loaded at the scene in slurry commanding tank;
2) polyacrylamide of said ratio, sulfonated gilsonite, fluid loss agent are added in clear water successively mix;
3) add the polymer gel plugging agent of aforementioned proportion again, stir and make it fully dissolve;
4) the pons hematoma agent of aforementioned proportion, rubber grain, sawdust, mica, vermiculite, uniaxial pressure plugging agent is added again respectively, stirring and dissolving;
5) add alkalinity control agent and PH is adjusted to 9 ~ 10.
3. the water-base drilling fluid of inducibility crack as claimed in claim 1 or 2 leak-proof leak-stopping, is characterized in that: described polymer gel plugging agent is the inorganic salt that can provide potassium ion or sodium ion.
4. the water-base drilling fluid of inducibility crack as claimed in claim 3 leak-proof leak-stopping, is characterized in that: described polymer gel plugging agent is Repone K or sodium chloride or saltpetre.
5. the water-base drilling fluid of inducibility crack as claimed in claim 1 or 2 leak-proof leak-stopping, is characterized in that: described individual event pressure plugging agent is particle diameter is 300 ~ 800 object calcium carbonate superfine powders.
6. the water-base drilling fluid of inducibility crack as claimed in claim 1 or 2 leak-proof leak-stopping, is characterized in that: described alkalinity control agent is sodium hydroxide or potassium hydroxide.
7. the water-base drilling fluid of inducibility crack as claimed in claim 1 or 2 leak-proof leak-stopping, is characterized in that: described pons hematoma agent size distribution is
15 ~ 20% particle diameter 0.05 ~ 0.1mm;
20 ~ 25% particle diameter 0.1 ~ 0.2mm;
15 ~ 20% particle diameter 0.2 ~ 0.3mm;
5 ~ 15% particle diameter 0.3 ~ 0.4mm;
5～10%QD—2；
1 ~ 5% particle diameter 0.4 ~ 0.5mm.
8. the water-base drilling fluid of inducibility crack as claimed in claim 1 or 2 leak-proof leak-stopping, is characterized in that: described rubber grain size distribution is
30 ~ 40% particle diameter 0.01 ~ 0.1mm;
20% ~ 30% particle diameter 0.1 ~ 0.3mm;
20% ~ 30% particle diameter 0.3 ~ 0.5mm.
9. the water-base drilling fluid of inducibility crack as claimed in claim 1 or 2 leak-proof leak-stopping, is characterized in that: described fluid loss agent is cellulose sodium salt.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| CN107523281A (en) * | 2017-10-11 | 2017-12-29 | 成都瑞吉星化工有限责任公司 | A kind of drilling fluid oil-base mud sealing agent |
| CN108690581A (en) * | 2017-04-06 | 2018-10-23 | 中国石油化工股份有限公司 | A kind of high-efficiency water-base drilling fluid sealing agent |
| CN109868124A (en) * | 2017-12-04 | 2019-06-11 | 中国石油化工股份有限公司 | A kind of drilling fluid and preparation method thereof for displaced type gas cut stratum |
| CN110358513A (en) * | 2018-03-26 | 2019-10-22 | 中国石油化工股份有限公司 | A kind of bridge joint leak stopping slurry and preparation method thereof |
| CN110764541A (en) * | 2018-07-26 | 2020-02-07 | 中国石油天然气股份有限公司 | Method and device for determining particle composition of drilling fluid |
| CN110892038A (en) * | 2017-07-14 | 2020-03-17 | 沙特阿拉伯石油公司 | Waste automobile tire as plugging material |
| CN110954451A (en) * | 2019-12-06 | 2020-04-03 | 中国石油天然气股份有限公司 | Application concentration and application particle size optimization method of flexible gel particle plugging agent |
| CN111849430A (en) * | 2020-07-16 | 2020-10-30 | 荆州市学成实业有限公司 | Preparation method of ultralow permeability agent for water-based drilling fluid |
| CN113444505A (en) * | 2021-05-08 | 2021-09-28 | 中国石油大学(华东) | Self-adaptive leaking stoppage spacer fluid system and preparation method thereof |
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| CN108690581A (en) * | 2017-04-06 | 2018-10-23 | 中国石油化工股份有限公司 | A kind of high-efficiency water-base drilling fluid sealing agent |
| CN110892038A (en) * | 2017-07-14 | 2020-03-17 | 沙特阿拉伯石油公司 | Waste automobile tire as plugging material |
| CN107523281A (en) * | 2017-10-11 | 2017-12-29 | 成都瑞吉星化工有限责任公司 | A kind of drilling fluid oil-base mud sealing agent |
| CN107523281B (en) * | 2017-10-11 | 2020-11-10 | 成都瑞吉星化工有限责任公司 | Oil-based mud plugging agent for drilling fluid |
| CN109868124A (en) * | 2017-12-04 | 2019-06-11 | 中国石油化工股份有限公司 | A kind of drilling fluid and preparation method thereof for displaced type gas cut stratum |
| CN110358513B (en) * | 2018-03-26 | 2021-07-30 | 中国石油化工股份有限公司 | Bridging leak stoppage slurry and preparation method thereof |
| CN110358513A (en) * | 2018-03-26 | 2019-10-22 | 中国石油化工股份有限公司 | A kind of bridge joint leak stopping slurry and preparation method thereof |
| CN110764541A (en) * | 2018-07-26 | 2020-02-07 | 中国石油天然气股份有限公司 | Method and device for determining particle composition of drilling fluid |
| CN110764541B (en) * | 2018-07-26 | 2023-04-07 | 中国石油天然气股份有限公司 | Method and device for determining particle composition of drilling fluid |
| CN110954451A (en) * | 2019-12-06 | 2020-04-03 | 中国石油天然气股份有限公司 | Application concentration and application particle size optimization method of flexible gel particle plugging agent |
| CN110954451B (en) * | 2019-12-06 | 2023-02-03 | 中国石油天然气股份有限公司 | Application concentration and application particle size optimization method of flexible gel particle plugging agent |
| CN111849430A (en) * | 2020-07-16 | 2020-10-30 | 荆州市学成实业有限公司 | Preparation method of ultralow permeability agent for water-based drilling fluid |
| CN113444505A (en) * | 2021-05-08 | 2021-09-28 | 中国石油大学(华东) | Self-adaptive leaking stoppage spacer fluid system and preparation method thereof |
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