CN1918361A - Suppressing fluid communication to or from a wellbore - Google Patents

Suppressing fluid communication to or from a wellbore Download PDF

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Publication number
CN1918361A
CN1918361A CNA2005800046555A CN200580004655A CN1918361A CN 1918361 A CN1918361 A CN 1918361A CN A2005800046555 A CNA2005800046555 A CN A2005800046555A CN 200580004655 A CN200580004655 A CN 200580004655A CN 1918361 A CN1918361 A CN 1918361A
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Prior art keywords
fluid
polymer
epoxy resin
pit shaft
synthetic
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CNA2005800046555A
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Chinese (zh)
Inventor
J·D·博萨尔特斯
G·J·M·范艾登
M·J·朗斯
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Shell Internationale Research Maatschappij BV
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Shell Internationale Research Maatschappij BV
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Publication of CN1918361A publication Critical patent/CN1918361A/en
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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
    • C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
    • C09K8/504—Compositions based on water or polar solvents
    • C09K8/506—Compositions based on water or polar solvents containing organic compounds
    • C09K8/508—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
    • C09K8/5086—Compositions based on water or polar solvents containing organic compounds macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • 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
    • C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
    • C09K8/504—Compositions based on water or polar solvents
    • C09K8/506—Compositions based on water or polar solvents containing organic compounds
    • C09K8/508—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
    • C09K8/512—Compositions based on water or polar solvents containing organic compounds macromolecular compounds containing cross-linking agents
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B33/00—Sealing or packing boreholes or wells
    • E21B33/10—Sealing or packing boreholes or wells in the borehole
    • E21B33/13—Methods or devices for cementing, for plugging holes, crevices, or the like
    • E21B33/138—Plastering the borehole wall; Injecting into the formation

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  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Geology (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Physics & Mathematics (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Sealing Material Composition (AREA)
  • Devices And Processes Conducted In The Presence Of Fluids And Solid Particles (AREA)
  • Water Treatment By Sorption (AREA)
  • Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)

Abstract

A method for suppressing fluid communication to or from a wellbore in a subsurface formation, which method comprises providing a well fluid which comprises solid particles in a carrying fluid, which solid particles include a reactive polymer; introducing the well fluid into the wellbore so that carrier fluid passes through an interface between the wellbore and its surroundings, wherein particles are accumulated at the interface; and allowing the polymer to form a solid plug suppressing fluid communication through the interface; and a well fluid for use in a wellbore, which well fluid comprises solid particles in a carrying fluid, which solid particles include a reactive polymer.

Description

Be suppressed to or be communicated with from the fluid of pit shaft
Technical field
The present invention relates to a kind of method that is suppressed to or is communicated with from the fluid of subsurface formations pit shaft, and a kind of borehole fluid that is used for pit shaft.
Background technology
Drilling well and operating period in subsurface formations, exist many needs to suppress the situation that downhole fluid is communicated with.
For example, the fluid of output comprises a large amount of water usually from hydrocarbon ils or gas well.The term water here also comprises salt solution traditionally.The water source of described water can be formation water of charging near the stratum hydrocarbonaceous reservoir or the water that injects the stratum from ground.
Water in the produced fluid has reduced the jacking capacity of oil or gas well, in case and output, described water can become environmental problem.Usually, the water content of produced fluid can increase along with the age of well, and needed again described well is handled so that the more a spot of water of output in some stage.
A kind of similar operation is to suppress to be communicated with by the fluid that the crack produced in the stratum around the pit shaft.The crack can make the drilling fluid stratum on every side of undesirably bleeding, thereby needs sealing to be communicated with by the fluid that the crack produced.
Other need suppress situation that downhole fluid is communicated with and can occur under the situation that wellbore casing leaks, and for example has cavity or when metal sleeve and when having space or annulus between the cement on every side when the sleeve pipe back.It is irregular that these situations will be referred to as cement after this.
In needing the example of encapsulation situations, subsurface formations is made of a plurality of stacked oil reservoirs, and pit shaft passes the stratum extension and has preforation tunnel at all oil reservoirs places.After producing a period of time, to studies show that of well logging, oil reservoir and creation data some oil reservoirs still have high hydrocarbon saturation and other oil reservoir is fed through to by water.Therefore need optionally suppress pit shaft is communicated with fluid between ripples and the stratum.
This is not a direct task.The applicant is this problem finally below following situation: relatively large wellbore casing (diameter be 7 "=18cm) utilize less tubing string (diameter is 3.5 "=9cm) and the completion that between higher bottom hole temperature (BHT) (〉=110 ℃), different layers, has under the higher pressure reduction (reaching 3000psi=21MPa) be complicated.
Under so high pressure reduction, conventional cement seal is not a kind of feasible selection.
If other is chosen in this area is feasible, obviously only have those very complicated mechanical to select be feasible.
A kind of mechanical selection will be that the selectivity well completion section with multi-region is set.This will hint at first to be that the assembly of down-hole string and equipment is removed with having well completion section now.Afterwards, optionally well completion section is set, wherein utilize packer parts that all relevant layers are isolated, so that can exploit by a certain zone that valve is controlled from these zones.
Another kind of conventional machinery is chosen as: cementing is communicated with fluid between the pit shaft to seal all preforation tunnels in the bushing pipe above existing perforated interval, subsequently hydrocarbon realm is carried out reperforation.In addition, this need remove all existing well completion section.
It all is expensive and time-consuming that all these machineries are selected, because all at first existing well completion section will be removed under each situation, thereby needs rig at the scene.
Publication number is that the european patent application of EP1369401 has disclosed the sealing synthetic that is used in the pit shaft, and this synthetic comprises the copolymer of water, cementitious materials and water-soluble crosslinkable materials such as acrylic acid 2-hydroxyl ethyl ester monomer (2-hydroxyethyl acrylate monomer) or acrylamide and t-butyl acrylate (t-butyl acrylate).This sealing synthetic can bear higher pressure reduction (maximum return pressure) than the cement of routine.Described synthetic can enter in the pit shaft by existing well completion section.By applying squeeze pressure, crosslinkable materials and water infiltrate around the pit shaft stratum one segment distance and carry out crosslinked at there.Cement stops at the interface place with pit shaft and solidifies herein.Known sealing synthetic is difficult to relatively prepare and handles and need special technical ability in operation.For example in wellbore fluids or well under the influence in localized heat zone cement can in pipe or pit shaft, solidify, and the cement that solidifies in flexible pipe or the production tube is removed is very expensive.In addition, after cementing, need to utilize the salt solution of thickness that excessive cement is recycled.This will make whole oil well completion section be exposed in the mixture of salt solution-cement, and this mixture will cause potential pollution to the critical component in the oil well such as gas lift valve and side-pocket mandrel.
U.S. Patent application US3525398 discloses a kind of method that is used to seal the permeable formation internal fissure, wherein the thixotropic liquid suspension of granular deformable solid resin is injected in the described crack, thereby and described particle deform under pressure in the crack and to form impermeable substantially interlayer.Another kind provides the physical method of liquid seal to learn from U.S. Pat 3302719 in the crack, wherein, solid polymer/wax/resin particle is injected in fracturing process to form temporary blocking up, and it can be dissolved by formation hydrocarbon subsequently.Yet the another kind of physical method of underground liquid sealing that provides can learn from international patent application publication WO 01/74967 that the polymer that wherein forms gel is injected into lost-circulation district and expansion herein.
Summary of the invention
The object of the present invention is to provide a kind of suppress improvement that pit shaft is communicated with the fluid between the stratum on every side method.
Another object of the present invention is to provide a kind of special borehole fluid that is applicable to that this is improved one's methods.
For this reason, provide a kind of and be used to be suppressed to or the fluid of pit shaft is communicated with in the subsurface formations method, described method comprises:
-a kind of borehole fluid that comprises the solid particle in the carrier fluid is provided, described solid particle comprises living polymer;
-described borehole fluid being injected pit shaft so that carrier fluid passes the interface between pit shaft and the stratum around it, described particle is in described accumulation at the interface; And
-make described polymer form the solid plug of inhibition by the fluid connection at interface.
A kind of borehole fluid that is used in the pit shaft also is provided, and described borehole fluid comprises the solid particle in the carrier fluid, and described solid particle comprises living polymer.The invention still further relates to the use of this borehole fluid in pit shaft, be communicated with in particular for the fluid that suppresses at the interface.
The observation that the present invention is based on the applicant obtains, and the solid polymer particle in the carrier fluid forms a kind of easy to handle sealing synthetic in the pit shaft, special that is used in.The gravel injection blending unit of standard is enough to be used in preparing described borehole fluid.The required special cement mixer of complicated multicomponent cement admixture is optional just as preparing.Owing to do not have dust constituent, thereby the present invention provides a kind of safer system for the operator.
The term polymer plug comprises the polymeric layer that forms along described interface.Described living polymer is reacted so that form solid plug.Be that described polymer plug can not be dissolved by reservoir fluid aptly.Can bear higher pressure reduction by the polymer plug that living polymer forms than conventional sealing system, as 21MPa even higher.According to the mechanical property of polymer, unconfined polymer compressive resistance can be up to 50MPa or higher.For example, can use salt solution or hydrocarbon fluid (as diesel oil) as carrier fluid.
Described particle is a solid, is not have viscosity under ground condition aptly.Can carry out the compliance selection to chemistry and physical property for specific application.Can be preferably, described particle comprises polymer or the polymer synthetic of 50wt% at least, more preferably is 90wt% at least, most preferably is that they only contain polymer or polymer synthetic.
Described carrier fluid is clamp-oned the stratum so that described solid particle accumulates at the interface described., preferably the size of described particle is selected so that they arrive described interface and can not enter the stratum significantly for this reason, be aptly described size less than 10cm, preferably less than 2cm, be about 1cm or littler usually.When the preforation tunnel formation on stratum was stretched at described interface from pit shaft, described particle had minimum linear dimension at 1mm aptly in the scope between the 2cm.When described interface was made of the crack, the linear dimension of described minimum suited at 500 microns between the 2cm.Irregular in order to remedy cement, particle is aptly little, in the scope of 1-200 micron.Also can select aptly, as be generally sphere, cylindricality or cube, but can also be irregular described coating of particles.
Described particle accumulates at the interface described, and unlike the water-soluble crosslinkable material of existing sealing synthetic, described particle can not infiltrate the stratum in case after solidifying directly at described solid layer or the plug of forming at the interface.This solid layer at the interface has following advantage: if desired, the perforating technology by standard can be directly and is optionally recovered fluid once more and be communicated with.In addition, if the also promptly described place of going deep into a certain distance in stratum that is sealed in forms, reperforation may become problem.Another advantage of solid layer at the interface is: be eliminated but the hydrocarbon of output is latched in the risk of a certain position.
Known curable polymer or polymer synthetic such as phenolic resins synthetic, alkyd resin synthetic, epoxy resin synthetic or polyurethane synthetic can be used as reactive polymer particle.Be aptly, curable synthetic comprises at least two kinds of different compounds, and as living polymer chains and crosslinking agent or hardener, common described compound generation cross-linking reaction is to form (crosslinked) polymeric web.Every kind of reactive polymer particle is suitable to comprise two kinds of compounds.
The temperature that temperature at the interface can be above the ground level usually.The temperature of oil-containing reservoir is usually between 110 to 180 degrees centigrade, as 150 degrees centigrade.Only it is reacted by making living polymer be in the sufficiently long time of interface temperature (as 1-24 hour).Crosslinked appear in the particle aptly and particle between so that form trickle hermetically-sealed construction.
The speed of reacting at elevated temperatures according to particular reactive polymer, before reactive polymer particle is injected, need cooling fluid is injected pit shaft, for example want near the temperature reduction 20-50 kelvin absolute scale (Kelvin) in the pit shaft seal interface in order to make.Can make by this way polymer beads can be prematurely at the passage internal reaction that arrives downwards along pit shaft at the interface.
The another kind of selection is that living polymer is selected so that be heated to above formation temperature at the interface extraly for described reaction needed takes place.In this case, a kind of suitable heater for example is suspended on electric heater on the cable and can be used in the pit shaft so that described reaction is taken place.In addition, utilize heating fluid such as hot salt brine can be used to heat partly and temporarily the stratum to the pre-flushing at interface.
The relative density of selective polymerization composition granule and carrier fluid is so that the density of described particle approximates or be higher or lower than the density of carrier fluid.Be that the density under the environment temperature can be 500kg/m aptly 3Or higher, but can not surpass 1500kg/m 3The particle of equal densities will float in the described liquid so that obtain metastable suspension, and described suspension can easily be handled on ground.More highdensity particle will have such effect: the excess particles that promptly can not accumulate in the interface will automatically be deposited on wellbore bottom.On the other hand, when described particle during than described liquid light, excessive particle will be easy to upwards rise to the surface, thereby they are removed.
The present invention also provides a kind of borehole fluid that is used in the pit shaft, and described borehole fluid also comprises the solid particle in the carrier fluid, and described solid particle comprises living polymer.This borehole fluid (treatment fluid) can be effectively and is sealed fluid permeable interfaces between preforation tunnel and crack and other pit shaft and the stratum reliably.Can be preferably, the living polymer of borehole fluid comprises the epoxy resin synthetic, described epoxy resin synthetic comprises epoxy resin, curing compound and optional setting accelerator, catalyzer and/or filler.
Description of drawings
Now, will in conjunction with the accompanying drawings embodiments of the invention be carried out more detailed description, wherein:
Fig. 1-4 shows a plurality of stages of implementing the method for the invention in the pit shaft that stretches into the layering reservoir; And
Fig. 5 shows and is used to test schematic test container of the present invention.
Used same reference numerals is represented same or analogous object in different accompanying drawings.
The specific embodiment
Referring to Fig. 1, Fig. 1 shows the lower part that extends into the pit shaft 1 on stratum 4 from the ground (not shown).Described in this example stratum is layering. Layer 6 and 7 contains hydrocarbon ils, and layer 8 contains water.Layer 6,7,8 is isolated by border or impermeable layer 10,11.Pit shaft 1 has the sleeve pipe 14 that is made of the metallic sheath tubing string, and the annular space 15 between the borehole wall of sleeve pipe 14 and pit shaft 1 is full of cement.Downhole well completion is identified by oil pipe 16 that reaches ground and packer 18.
Fluid enters pit shaft 1 and is adopted ground by oil pipe 16 from layer 6,7,8 according to the direction shown in the arrow by preforation tunnel 20,21,22.A large amount of water 24 that this fluid contains oil 23 and flows out from layer 8.Need seal up from the aquifer 8 and flow out the water that particularly flows out by preforation tunnel 21, described preforation tunnel 21 is formed between pit shaft and the aquifer at the interface.
Referring to Fig. 2, at first pass oil pipe 16 flexible pipe 25 is lowered to for this reason, and by flexible pipe 25 cooling fluid 27 is injected pit shaft 1, this fluid is a mobile segment distance in stratum 6,7,8 thus.Cooling fluid can be the water that contains 2wt%KCL.Volume and the speed injected can be determined according to temperature simulation.Usually can 1-5bbls/min (0.159-0.795m 3/ min) speed is with 200-2000bbls (31.8-318m 3) cooling fluid inject the stratum so that make temperature decline 20-50 kelvin absolute scale (kelvin) at the interface.
Referring to Fig. 3, after stopping to inject cooling fluid, immediately a kind of special borehole fluid 28 is pumped into pit shaft by flexible pipe.According to the present invention, described borehole fluid comprises the solid reactive polymer particles 29 that is suspended in the carrier fluid.The concentration of described particle is between the 1-50wt% of total borehole fluid, and the size of described particle is between 0.1mm and 5cm.For spheric granules, described particle is of a size of the weighted average diameter of variable grain.For difform particle, can be determined and minimum linear dimension can be confirmed as minimum in the described maximum magnitude along the particle maximum magnitude of each linear direction, and total particle size is the weighted average of the smallest linear dimension of variable grain.
A kind of suitable living polymer (synthetic) comprises epoxy resin and crosslinking agent, and these two kinds of materials all are included in the same particle.
At least a portion carrier fluid flows into stratum 6,7,8 by preforation tunnel 20,21,22, and described carrier fluid is similarly the water that contains 2wt%KCL.Because their sizes, reactive polymer particle will can not be infiltrated the stratum also will building up in perforation tunnel between pit shaft and stratum at the interface.Thereby this can cause the pressure increase to be noted on ground owing to having reduced injectability.Injection can last till aptly and obtained maximum ground pressure.Pressure (being called as overbalance) is kept a period of time, as 2-16 hour.During this period, described temperature at the interface is increased to once more near common formation temperature.Select the living polymer synthetic so that under this temperature increase situation, react.Suitably, under the surface temperature and injection period the reaction speed that flows into downwards under the temperature in the pit shaft process of particle can be left in the basket.Before the curing reaction that forms solid plug began, some that solid particle can take place at elevated temperatures was softening.Preferably: the glass transition temperature of polymer is higher than the environment temperature at place, seal interface after reaction.Cured polymer is non deformable basically.
Under formation temperature, it is crosslinked to understand generation in particle and between the adjacent particle, so that at the sealant 31 that forms obstruction or polymer at the interface.Thereby the suitable particle of selecting can soften at elevated temperatures forms good intergranular combination so that they can closely contact mutually.Described swelling polymer also is possible to form better sealing after solidifying.A kind of polymer that swells still is considered to a kind of solid polymer.
After living polymer solidified, preforation tunnel 20,21,22 is sealed so that 6,7,8 fluid of pit shaft and layer are communicated with to be suppressed.Regain described flexible pipe and utilize technology known in the art optionally to carry out reperforation by 16 pairs of oil reservoirs of oil pipe 6,7.
Described result is shown in Figure 4.Oil 23 flows into from layer 6,7 by new preforation tunnel 35,36, and is suppressed from the water of the layer 8 output sealant 31 by at the interface.
Obviously, as the injection of fruit granule in pit shaft and far away from the reaction of being carried out, then can not need cooling step gathering at the interface.
In a preferred embodiment, described living polymer is an epoxy resin composition.Epoxy resin composition generally includes epoxy resin, crosslinking agent or curing compound, selectively also has setting accelerator, catalyzer and/or packing material.For each component in this mixture, many suitable materials are being known in the art.
Epoxy resin is the molecule that contains more than an epoxy radicals.Two kinds of primary categories of epoxy resin can be other glycidyl epoxies of phase region (glycidyl epoxy) and no glycidyl epoxies (non-glycidyl epoxy).Glycidyl epoxies also can be divided into glycidol ether, ethylene oxidic ester and glycidyl amine.Described no glycidyl epoxies is aliphatic or alicyclic epoxy resin.Condensation reaction by suitable dihydroxy compounds, binary acid or diamines and epoxychloropropane can make glycidyl epoxies.No glycidyl epoxies can make by the peroxidization of olefinic double bonds (olefinic double bond).
Suitable and common tetraglycidel ether epoxy resin be bisphenol-A diglycidyl ether (diglycidyl ether) (DGEBA) and novolac epoxy resin.The diglycidyl ether of bisphenol-A (DGEBA) can be by synthesizing bisphenol-A and epichlorohydrin reaction when having base catalyst.The character of DGEBA resin depends on the quantity of the repetitive that constitutes resin chain, is also referred to as the degree of polymerization.Usually in quantity described in many commercial products between 0 to 25.
Other suitable epoxy resin is novolac epoxy resin, and it is the glycidol ether of novolac.Phenol and formaldehyde under the effect of acidic catalyst overreaction to generate novolac.Novolac epoxy resin can be synthesized by novolac and epoxychloropropane are reacted under the situation of NaOH as catalyzer.Novolac epoxy resin contains a plurality of epoxy radicals usually.The epoxy radicals quantity of each molecule depends on the quantity of phenolic hydroxyl in the novolac of beginning, the degree of their reactions and the degree of low molecular species polymerization between synthesis phase.A plurality of epoxy radicals make these resins obtain high crosslink density, and it has caused fabulous temperature tolerance, chemical resistance and anti-dissolubility.In addition, novolac epoxy resin has also shown the extraordinary performance under the temperature that raises, good mouldability and mechanical performance.
Another kind of suitable epoxy resin also can be used, as the epoxy resin based on orthoresol (orto-cresol) rather than bisphenol-A.
Described solidification process is a chemical reaction, and wherein, epoxy radicals in the epoxy resin and curing compound (hardener) reaction is highly cross-linked three-dimensional netted to form.For epoxy resin being converted into the rigidity material, must utilize hardener with described resin solidification.According to the selection of curing compound, epoxy resin can be under 5-160 ℃ any practical temperature apace, easily solidify.Described synthetic is suitable for being cured under the temperature of the position of needs sealing, particularly is higher than 50 ℃, preferably between 80 ℃ to 150 ℃.
The multiple curing compound that is used for epoxy resin is being known in the art.The common curing compound that is used for epoxy resin comprises amine, polyamide, phenolic resins, acid anhydride, isocyanates and polymercaptan.Curing power of cure system (cure kinetics) and T gDepend on the molecular structure of hardener.The selection of resin and hardener depends on uses and required character.The stechiometry of epoxy resin-stiffening system has also influenced the Substance Properties that is cured.
Amine is the prevailing curing compound that is used for epoxy resin cure.Primary amine and secondary amine and the reaction of epoxy resin height.Tertiary amine generally is used as catalyzer, the so-called setting accelerator that is used for curing reaction.The application of excess catalyst can obtain to solidify faster, but usually can consume working life and heat stability.The catalytic activity of catalyzer influences the physical property of the polymer that finally is cured.
Epoxy resin also can utilize the phenol hardener to be cured.The use of setting accelerator is preferred for taking place to solidify fully.
Suitable epoxy resin synthetic of the present invention also can be based on liquid-state epoxy resin, thereby it can mix and be used to bear the solid polymer with epoxy resin that incomplete curing reaction is formed for injecting pit shaft with curing compound.Solid particle is after being exposed to suitable at the interface temperature, and by further reacting with curing compound, described solid particle can also further be solidified.For example, liquid-state epoxy resin can be the novolac epoxy resin that epoxy group content is 5500-5700mmol/kg.Another is exemplified as moderately viscous bisphenol-A/epichlorohydrin resin that epoxy group content is 5000-5500mmol/kg, EPIKOTE 828 materials as is known.Curing compound under two kinds of situations can be diethyl toluene diphenylamines (di-ethyl-toluene-di-aniline).
Suitable synthetic also can be based on powder coating epoxy resin composition, as EPIKOTE1001 or 3003, perhaps based on the high temperature powder coating composition.EPIKOTE is commercially available decomposability product (Resolution Performance Product) material.
Filler can be added in the epoxy resin synthetic to reduce cost, to limit contraction, the adhesion characteristics of restriction solid particle and/or the density of control particle after the curing.Calcium carbonate, silicon or glass marble can be used as suitable filler.
Example
The present invention tests in so-called shutoff experiment.With reference to figure 5, permeability is that the column rock core 50 of the Berea sandstone of 500 millidarcies (milliDarcy) is fixed in the steel vessel 53, and this steel vessel 53 can be placed in the baker (not shown).On a surface of rock core 50, be drilled with a little preforation tunnel 60.The external diameter of rock core and highly all be 5cm, and the diameter of preforation tunnel is that 0.8cm, the degree of depth are 1em.Utilize outside 65 pairs of preforation tunnels 60 of epoxy resin and carry out fluid-tight with core surface outside surperficial 55 facing surfaces 63.Preparation does not have chippy High temp. epoxy resins coated powder suspension in 2% KCl salt solution of filler, and wherein to be lower than the percentage by weight of 1mm and solid be 20% to the size of particle.Pressure with 0.5-1bar is clamp-oned the perforation reaming hole with described suspension.Make described synthetic solidify 48 hours down with the formation of interface zone 68 places in preforation tunnel 60 and between rock core 50 and the preforation tunnel 60 solid plug at 150 ℃.Afterwards, under 150 ℃, be pressed into surface 63 by fluid pressure (salt solution) and determine formed permeability by opening 70 with 180bar.Formed permeability (permeability of recovery) is 0.02% of a rock core original permeability.In another experiment, powder suspension is clamp-oned preforation tunnel with the pressure of 25bar and solidify in the same way and test.Show that the depth ratio of going deep into rock core at described plug 70 under the higher pressure wants dark under lower pressure though cut treated rock core, permeability and first experiment of recovery are similar.

Claims (9)

1. one kind is suppressed to or the fluid of pit shaft is communicated with in the subsurface formations method, and described method comprises:
-borehole fluid that comprises the solid particle in the carrier fluid is provided, described solid particle comprises living polymer;
-described borehole fluid being injected pit shaft so that carrier fluid passes the interface between pit shaft and the stratum around it, described particle is in described accumulation at the interface; And
-make described polymer form the solid plug of inhibition by the fluid connection at interface.
2. the method for claim 1 is characterized in that: described interface is made of a kind of in irregular group of the cement that comprises between preforation tunnel in the stratum, crack, metal sleeve and the stratum in the stratum.
3. method as claimed in claim 1 or 2, it is characterized in that: described polymer is the thermosetting polymer synthetic, for example the polymer synthetic of selecting from the group that comprises phenolic resins synthetic, alkyd resin synthetic, epoxy resin synthetic and polyurethane synthetic.
4. method as claimed in claim 3 is characterized in that: described polymer is the epoxy resin synthetic, and it comprises epoxy resin, curing compound and optional setting accelerator, catalyzer and/or filler.
5. as the arbitrary described method of claim 1-4, it is characterized in that: before the borehole fluid that will have reactive polymer particle injects, a kind of cooling fluid is injected pit shaft.
6. as the arbitrary described method of claim 1-5, it is characterized in that: before the borehole fluid that will have reactive polymer particle injects, a kind of heating fluid is injected pit shaft.
7. as the arbitrary described method of claim 1-6, it is characterized in that: subsequently described subsurface formations is carried out optionally reperforation.
8. one kind is used in the interior borehole fluid of pit shaft, and described borehole fluid comprises the solid particle in the carrier fluid, and described solid particle comprises living polymer.
9. borehole fluid as claimed in claim 8 is characterized in that: described living polymer comprises the epoxy resin synthetic, and described epoxy resin synthetic comprises epoxy resin, curing compound and optional setting accelerator, catalyzer and/or filler.
CNA2005800046555A 2004-02-12 2005-02-10 Suppressing fluid communication to or from a wellbore Pending CN1918361A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP04100547.1 2004-02-12
EP04100547 2004-02-12

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CN1918361A true CN1918361A (en) 2007-02-21

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EP (1) EP1721059A1 (en)
CN (1) CN1918361A (en)
AU (1) AU2005212638B2 (en)
CA (1) CA2554237A1 (en)
EA (1) EA008963B1 (en)
NO (1) NO20064082L (en)
NZ (1) NZ548688A (en)
WO (1) WO2005078235A1 (en)

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