CN105441052A - Nonacid mud cake flushing agent, flushing liquid and flushing method - Google Patents
Nonacid mud cake flushing agent, flushing liquid and flushing method Download PDFInfo
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- CN105441052A CN105441052A CN201510753194.7A CN201510753194A CN105441052A CN 105441052 A CN105441052 A CN 105441052A CN 201510753194 A CN201510753194 A CN 201510753194A CN 105441052 A CN105441052 A CN 105441052A
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- flushing
- mud cake
- nonacid
- parts
- washing fluid
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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
- C09K8/52—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning
- C09K8/524—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning organic depositions, e.g. paraffins or asphaltenes
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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
- C09K8/52—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning
- C09K8/528—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning inorganic depositions, e.g. sulfates or carbonates
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- 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
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
Abstract
The invention discloses a nonacid mud cake flushing agent, a flushing liquid and a flushing method. The nonacid mud cake flushing agent consists of the following components in parts by mass: 40-50 parts of sodium tripolyphosphate, 10 parts of ammonium persulfate and 3-5 parts of an anionic surfactant. The flushing agent and water can be conveniently prepared into the flushing liquid; in the flushing liquid, sodium tripolyphosphate takes the effect of a dispersant, ammonium persulfate takes the effect of an oxidant, and the anionic surfactant can take the effects of wetting, permeation, emulsification, dispersion, solubilization and bubbling; the components achieve a synergistic effect; the pertinence is high; mud cakes on the wall of a well can be efficiently wetted, decomposed and removed, so that reservoir protection is facilitated and serious corrosion caused to a pipe column by adopting an acid-washing flushing liquid is avoided; and a mixed liquid after the flushing by the flushing liquid is high in stability, has high suspension stability, and is free of sedimentation and liable to flow back during field construction, thereby reducing underground safety accidents.
Description
Technical field
The invention belongs to petroleum drilling engineering chemical agent technical field, be specifically related to a kind of nonacid mud cake irrigation, washing fluid and purging method.
Background technology
In petroleum drilling technological process, mud cake is in leak-off process, and the free water of drilling fluid enters rock stratum, and the solid phase particles in drilling fluid is attached to and the borehole wall is formed.The measured mud cake of matter can protect the borehole wall, effectively reduces leak-off.But after drilling well completes; when needing to recover the oil; then need these mud cake removals being formed; because these mud cakes plug the hole of borehole wall surrounding; oil in borehole wall surrounding oil reservoir can not be flowed in well, reduce the rate of permeation of reservoir, add oil gas and return row pressure power; cause oil and gas production to reduce, and be unfavorable for reservoir protection.
Mud cake also can have influence on the consolidation strength of cement mantle and sleeve pipe and the borehole wall in well cementing process.Well cementation is process cement being injected annular space between the borehole wall and sleeve pipe.In casing and cementing, the interface between bunch tube and grout becomes the first interface, and the interface between grout and the borehole wall becomes second contact surface.Due to factors such as hole anomaly, drilling fluid and grout are incompatible, easily form micro-annulus in bore hole annulus interface, thus reduce interface cementing strength, have a strong impact on cementing quality, even cause oil gas water channeling.Thus, the technical study that drilling fluid and mud cake effectively remove is carried out significant.
Washing fluid normally adds tensio-active agent or forms by drilling fluid dilution mixture in water, but the scouring capability of traditional washing fluid to drill-in fluid, mud cake is weak, efficiently the drilling fluid on the borehole wall cannot be cleaned up, to the Bao Erren that the borehole wall is formed and the mud cake of densification cannot effectively remove especially; For above problem, existing many novel washing fluid systems emerge.CN103965845A discloses a kind of shale gas horizontal cementing washing fluid, its primarily of nonionogenic tenside 2 ~ 10 parts, anion surfactant 2 ~ 7 parts, organic acid 2 ~ 4 parts, carry sticky carrying and cut agent 0.5 ~ 5.0 part, 72 ~ 100 parts, clear water composition; This washing fluid has certain shear force and viscosity, has stronger scouring capability; But because the superpolymer in mud cake has stronger cohesiveness, this washing fluid still effectively can not make the wetting decomposition of mud cake, and its validity of rinsing still needs further raising.
CN104449621A discloses a kind of efficient well cementation washing fluid system, it is made up of following component: 100 parts, clear water, filamentary material 0.2 ~ 0.8 part, oxidizing substance 1.6 ~ 8.0 parts, 0.3 ~ 1.5 part, polymkeric substance, weighting agent 0 ~ 120 part, salt 2.3 ~ 9.7 parts, organic acid 0.5 ~ 7.2 part, stablizer 2.0 ~ 10 parts, dispersion agent 0 ~ 0.6 part.Oxidizing substance in this washing fluid can promote that the organic polymer in mud cake is degraded, thus effectively reduces drilling fluid viscosity and filter cake texture intensity, is conducive to improving flush efficiency; But this washing fluid recipe ingredient is complicated, and the organic acid in component easily causes corrosion to tubing string, adds the difficulty of later stage borehole operation.
Summary of the invention
The object of this invention is to provide with the nonacid mud cake irrigation of one, its character for mud cake effectively decomposes flushing, and this irrigation is not containing strong acid component, can reduce because the later stage corrodes the borehole operation brought.
Second object of the present invention is to provide a kind of nonacid mud cake washing fluid formulated by above-mentioned irrigation.
3rd object of the present invention is to provide and a kind ofly uses the purging method of above-mentioned washing fluid in sieve tube completion.
In order to realize above object, the technical solution adopted in the present invention is:
A kind of nonacid mud cake irrigation, is made up of the component of following mass parts: tripoly phosphate sodium STPP 40 ~ 50 parts, ammonium persulphate 10 parts, anion surfactant 3 ~ 5 parts.
Nonacid mud cake irrigation provided by the invention, tripoly phosphate sodium STPP plays the effect of dispersion agent, clay component (as wilkinite etc.) in mud cake effectively can be disperseed, its dispersion mechanism is double electrode layer theory: in solution, small bits of clay is electronegative forms electrostatic double layer with diffusion layer institute positively charged, electrostatic double layer due to electrostatic force and diffusive force balance and stablize, to be formed after electrostatic double layer between particulate because of electrical charge rejection effect, make the clay particle in mud cake be easy to be discharged in solution and be convenient to remove, and remove particle in liquid and keep stable and do not flocculate; Ammonium persulphate is oxidizer composition, and it decomposes the oxyradical produced makes the polymkeric substance generation chain-breaking reaction in mud cake become inviscid low molecule organic matter, the parcel particle release such as wilkinite, calcium carbonate sticked in superpolymer is out convenient to remove; Anion surfactant has the effects such as wetting, infiltration, emulsification, dispersion, solubilising, foaming, mud cake can be made to be rinsed liquid wetting faster dissolve, its stronger latherability simultaneously, washing fluid can be made more easily solid phase particles to be carried to return when well-flushing and discharge, reduce secondary pollution.In this irrigation, three kinds of components act on for the main ingredient in mud cake respectively, each component rational proportion, and synergy, substantially increases the cleaning performance of mud cake washing fluid.
Described anion surfactant is Sodium dodecylbenzene sulfonate.
A kind of nonacid mud cake washing fluid, be made up of the component of following mass percent: tripoly phosphate sodium STPP 0.4 ~ 0.5%, ammonium persulphate 0.1%, anion surfactant 0.03 ~ 0.05%, surplus is water.
Nonacid mud cake washing fluid provided by the invention by above-mentioned irrigation and water formulated, irrigation and mass area ratio rationally, can form turbulence replacement and effectively rinse out the mud cake be attached on the borehole wall, change borehole wall water-wet situation, recover the rate of permeation of reservoir, developing result is good; Not containing strong acid in this washing fluid, heavy corrosion can not be caused to tubing string, reduce later stage operation, reduce security incident and occur; Mixed solution good stability after simultaneously using this washing fluid to rinse, has good suspension stability, occurs, easily return and discharge, decrease the generation of downhole safety accident during site operation without sedimentation.
Described anion surfactant is Sodium dodecylbenzene sulfonate.
The preparation method of above-mentioned nonacid mud cake washing fluid, is scattered in water by tripoly phosphate sodium STPP, ammonium persulphate, anion surfactant, stirs, to obtain final product.
The method preparation technology is simple, does not have special requirement to equipment, conveniently allocates at the construction field (site), has good developing result, also contributes to the bonding quality improving well cementing process simultaneously.
Use the purging method of above-mentioned nonacid mud cake washing fluid in sieve tube completion, comprise the following steps:
1) be no more than 50m place by under Flushing tubular column to apart from screen casing top, backwash is for slurry;
2) by Flushing tubular column by the distance being no more than 50m transfer successively carry out backwash for slurry, until bottom screen casing.
Step 1) and step 2) in, described backwash is not less than 450L/min for the discharge capacity of slurry.Described backwash can be carried out repeatedly for slurry process, until it is consistent to import and export water quality.
Sieve tube completion purging method provided by the invention, one-trip string can be realized and instead squeeze the outer drilling fluid operation of washing fluid cleaning screen casing continuously, terminate cup packer to be taken out safely at well-flushing, reduce cup packer body wear, reduce construction risk, improve technique success ratio.
Accompanying drawing explanation
Fig. 1 is the purging method related process tubing string schematic diagram of the embodiment of the present invention 1.
Embodiment
Below in conjunction with specific embodiment, the invention will be further described.
Embodiment 1
The nonacid mud cake irrigation of the present embodiment, is made up of the component of following mass parts: tripoly phosphate sodium STPP 50 parts, ammonium persulphate 10 parts, Sodium dodecylbenzene sulfonate 3 parts.
The nonacid mud cake washing fluid of the present embodiment, is made up of the component of following mass percent: tripoly phosphate sodium STPP 0.5%, ammonium persulphate 0.1%, Sodium dodecylbenzene sulfonate 0.03%, and surplus is water.
The preparation method of above-mentioned nonacid mud cake washing fluid, is be scattered in water by tripoly phosphate sodium STPP, ammonium persulphate, Sodium dodecylbenzene sulfonate, stirs, to obtain final product.
The purging method of the present embodiment, comprises the following steps:
1) will arrive apart from 50m place, screen casing top under Flushing tubular column, carry out first time backwash for slurry with the discharge capacity being not less than 450L/min; Anti-flushing well, after two weeks, reaches import and export water quality consistent;
2) by Flushing tubular column by the distance of 50m transfer successively carry out backwash for slurry, until bottom screen casing.
Embodiment 2
The nonacid mud cake irrigation of the present embodiment, is made up of the component of following mass parts: tripoly phosphate sodium STPP 40 parts, ammonium persulphate 10 parts, Sodium dodecylbenzene sulfonate 5 parts.
The nonacid mud cake washing fluid of the present embodiment, is made up of the component of following mass percent: tripoly phosphate sodium STPP 0.4%, ammonium persulphate 0.1%, Sodium dodecylbenzene sulfonate 0.05%, and surplus is water.
The preparation method of above-mentioned nonacid mud cake washing fluid, is be scattered in water by tripoly phosphate sodium STPP, ammonium persulphate, Sodium dodecylbenzene sulfonate, stirs, to obtain final product.
The purging method of the present embodiment, comprises the following steps:
1) will arrive apart from 50m place, screen casing top under Flushing tubular column, carry out first time backwash for slurry with the discharge capacity being not less than 450L/min; Anti-flushing well, after two weeks, reaches import and export water quality consistent;
2) by Flushing tubular column by the distance of 50m transfer successively carry out backwash for slurry, until bottom screen casing.
Embodiment 3
The nonacid mud cake irrigation of the present embodiment, is made up of the component of following mass parts: tripoly phosphate sodium STPP 45 parts, ammonium persulphate 10 parts, Sodium dodecylbenzene sulfonate 4 parts.
The nonacid mud cake washing fluid of the present embodiment, is made up of the component of following mass percent: tripoly phosphate sodium STPP 0.45%, ammonium persulphate 0.1%, Sodium dodecylbenzene sulfonate 0.04%, and surplus is water.
The preparation method of above-mentioned nonacid mud cake washing fluid, is be scattered in water by tripoly phosphate sodium STPP, ammonium persulphate, Sodium dodecylbenzene sulfonate, stirs, to obtain final product.
The purging method of the present embodiment, comprises the following steps:
1) will arrive apart from 50m place, screen casing top under Flushing tubular column, carry out first time backwash for slurry with the discharge capacity being not less than 450L/min; Anti-flushing well, after two weeks, reaches import and export water quality consistent;
2) by Flushing tubular column by the distance of 50m transfer successively carry out backwash for slurry, until bottom screen casing.
Comparative example 1
This comparative example mud cake washing fluid is water, and purging method is identical with embodiment 1.
Test example
This test example adopts following experimental arrangement to evaluate the cleaning efficiency of washing fluid, comprises the following steps:
1) drilling fluid obtained at scene is suppressed according to the method for " drilling liquid technology handbook " High Temperature High Pressure dehydration; (drilling fluid used belongs to polymkeric substance non-invasive drilling fluid system: 5% wilkinite+0.4% sodium carbonate+0.4% sodium hydroxide+0.3-0.5%KPAM+0.3%HVCMC+0.3%LVCMC+0.5-1%SPC+0.5%SHN-1+0.4 % ~ 0.6% non-fluorescence collapse-proof agent WFT-1+1% zero Invasive Drilling Fluid treatment agent+1% polymer elasticity microballoon shielding plugging agent+2% extreme pressure lubricant JRH-616+2% ~ 4% emulsified olefin SL-1+ limestone powder)
2) with bungee, mud cake is fixed on the urceolus of six fast rotational viscosimeters;
3) washing fluid prepared is loaded in Washing cup, open six fast rotational viscosimeter switches, after (600r/min) rotates the regular hour (15min) under fixed rotating speed, take out mud cake, check the cleaning situation of mud cake, take pictures; (have employed 300r/min and 600r/min two kinds of fixed rotating speeds during experiment respectively, experimental result is completely the same, and turbulent state when adopting 600r/min better to rinse at the bottom of simulation well, so be decided to be 600r/min, does not have an impact to experiment conclusion.)
Cleaning efficiency is calculated by following formula:
A＝(G1-G2)×100/(G1-G0)
In formula: A---cleaning efficiency, %; G0---rotating cylinder and filter weight, g; G1---rotating cylinder and filter weight after pressure mud cake, g; G2---rotating cylinder and filter weight after mud cake cleaning, g.
Washing fluid after experiment is poured in graduated cylinder, in 2h, observes washing fluid stability.Flush efficiency and the washing fluid stability of each embodiment and comparative example washing fluid are as shown in table 1.
The flush efficiency of each embodiment of table 1 and comparative example washing fluid and washing fluid stability test result
| Sequence number | Cleaning efficiency | Washing fluid stability |
| Embodiment 1 | 95％ | Stable, without obvious sedimentation |
| Embodiment 2 | 96％ | Stable, without obvious sedimentation |
| Embodiment 3 | 95％ | Stable, without obvious sedimentation |
| Comparative example | 40％ | Instability, has sedimentation |
From the test-results of table 1, mud cake scavenging solution cleaning efficiency provided by the invention, more than 95%, effectively can clean the mud cake on the borehole wall, and the good stability of each embodiment washing fluid, without obvious sediment; Comparative example washing fluid is unstable, has sedimentation to occur, and is not easy to return to discharge during site operation, easily causes downhole safety accident.
Fig. 1 is the process pipe string schematic diagram that embodiment 1 purging method is relevant, by lower and on be respectively well-flushing intubate 1, oil pipe 2, leather cup drag device 3, oil pipe 4, leather cup drag device 3, pressure release valve 5 and oil pipe string 6.
The entirety that pressure release valve and leather cup drag device are formed is defined as packer assembly.Mud cake cleaning in the past, mud cake cleaning sealer only has one, scavenging solution is the S-shaped flowing of annular space between screen casing and interior pipe, thus effectively can not clean the borehole wall, adopt packer assembly, add the resistance to flow of scavenging solution between screen casing and interior pipe, restriction scavenging solution flows as much as possible between the borehole wall and screen casing annular space, improve scavenging solution impact scope, effectively improve cleaning efficiency.Packer assembly has two or more being connected in series successively from top to bottom, and in the sliding sleeve being in the pressure release valve of below in adjacent two packer assemblies, to be in the sliding sleeve endoporus of the pressure release valve of top open for boring ratio.In Flushing tubular column, pitching can be thrown in successively from small to large when well-flushing, and fall to the sliding sleeve controlling corresponding pressure release valve along with the input of pitching successively can change high pressure flushing liquid, realize one-trip string and instead squeeze the outer drilling mud practice of flushing fluid cleaning screen casing continuously, and classification can be realized for washing and starching well operations by the pitching dropping into different diameter.After well-flushing terminates, pressure release valve can reduce pkr pick-up drag, is taken out safely by cup packer.
When carrying out well-flushing in horizontal well sieve tube completion, first horizontal section is divided into some sections by 50m, carries out and transfer the cleaning borehole wall piecemeal successively.Realize one-trip string and transfer the outer drilling mud practice of cleaning screen casing piecemeal, improve scavenging solution impact scope, effectively improve cleaning efficiency.Cup packer increases the resistance to flow between screen casing and interior pipe, forces flushing fluid to flow between screen casing and the borehole wall, improves the cleaning performance of the borehole wall, and the flushing fluid after the cleaning borehole wall is flow in interior pipe by the screen casing below cup packer, and then returns out ground.After well-flushing terminates, pitching builds the pressure and to be destroyed by inner for pressure release valve sliding sleeve, and the upper end of pressure release valve can get out of the way the inner aperture of discharge orifice simultaneously, and the interior or exterior space of valve body is communicated with, realizes oil jacket annular space and is communicated with pressure release, reduction pkr pick-up drag.And then efficiently the mud cake on the borehole wall is cleaned, recover the perviousness of oil reservoir 7, facilitate oil production process lasts, safety, carry out efficiently.
Claims (7)
1. a nonacid mud cake irrigation, is characterized in that, is made up of the component of following mass parts: tripoly phosphate sodium STPP 40 ~ 50 parts, ammonium persulphate 10 parts, anion surfactant 3 ~ 5 parts.
2. nonacid mud cake irrigation as claimed in claim 1, is characterized in that, described anion surfactant is Sodium dodecylbenzene sulfonate.
3. a nonacid mud cake washing fluid, is characterized in that, is made up of the component of following mass percent: tripoly phosphate sodium STPP 0.4 ~ 0.5%, ammonium persulphate 0.1%, anion surfactant 0.03 ~ 0.05%, and surplus is water.
4. nonacid mud cake washing fluid as claimed in claim 3, is characterized in that, described anion surfactant is Sodium dodecylbenzene sulfonate.
5. use a purging method for the nonacid mud cake washing fluid described in claim 3, it is characterized in that, comprise the following steps:
1) be no more than 50m place by under Flushing tubular column to apart from screen casing top, backwash is for slurry;
2) by Flushing tubular column by the distance being no more than 50m transfer successively carry out backwash for slurry, until bottom screen casing.
6. purging method as claimed in claim 5, is characterized in that, step 1) and step 2) in, described backwash is not less than 450L/min for the discharge capacity of slurry.
7. purging method as claimed in claim 5, is characterized in that, step 1) and step 2) in, described backwash is carried out repeatedly for slurry, until it is consistent to import and export water quality.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510753194.7A CN105441052B (en) | 2015-11-06 | 2015-11-06 | A kind of nonacid mud cake irrigation, flushing liquor and purging method |
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| CN201510753194.7A CN105441052B (en) | 2015-11-06 | 2015-11-06 | A kind of nonacid mud cake irrigation, flushing liquor and purging method |
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| CN105441052B CN105441052B (en) | 2018-07-17 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040040706A1 (en) * | 2002-08-28 | 2004-03-04 | Tetra Technologies, Inc. | Filter cake removal fluid and method |
| RU2411277C1 (en) * | 2009-09-14 | 2011-02-10 | Открытое акционерное общество "Научно-производственное объединение "Бурение" | Composition for preparing detergent flush fluid |
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| CN103849364A (en) * | 2012-11-30 | 2014-06-11 | 天津中油渤星工程科技有限公司 | Flushing liquid for oil-based drilling fluid well cementation and preparation method thereof |
| CN104327817A (en) * | 2014-11-11 | 2015-02-04 | 中国石油化工股份有限公司江汉油田分公司采油工艺研究院 | Shaft oil stain detergent as well as preparation method and application |
-
2015
- 2015-11-06 CN CN201510753194.7A patent/CN105441052B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040040706A1 (en) * | 2002-08-28 | 2004-03-04 | Tetra Technologies, Inc. | Filter cake removal fluid and method |
| RU2411277C1 (en) * | 2009-09-14 | 2011-02-10 | Открытое акционерное общество "Научно-производственное объединение "Бурение" | Composition for preparing detergent flush fluid |
| CN103849364A (en) * | 2012-11-30 | 2014-06-11 | 天津中油渤星工程科技有限公司 | Flushing liquid for oil-based drilling fluid well cementation and preparation method thereof |
| CN103756653A (en) * | 2013-12-19 | 2014-04-30 | 中国石油集团渤海钻探工程有限公司 | Solid-free anti-salt cleaning type well cementation spacer fluid and preparation method thereof |
| CN104327817A (en) * | 2014-11-11 | 2015-02-04 | 中国石油化工股份有限公司江汉油田分公司采油工艺研究院 | Shaft oil stain detergent as well as preparation method and application |
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