CN105820803A - Workover fluid and preparation method and application thereof - Google Patents

Workover fluid and preparation method and application thereof Download PDF

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Publication number
CN105820803A
CN105820803A CN201510001784.4A CN201510001784A CN105820803A CN 105820803 A CN105820803 A CN 105820803A CN 201510001784 A CN201510001784 A CN 201510001784A CN 105820803 A CN105820803 A CN 105820803A
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China
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described
agent
workover fluid
workover
characterised
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CN201510001784.4A
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Chinese (zh)
Inventor
温哲豪
李达
白建文
马得华
薛亚斐
张家富
衣德强
牟春国
傅鹏
朱更更
藤飞启
朱李安
贾建鹏
梁凌云
郑斌
崔云群
陈晓丽
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中国石油天然气股份有限公司
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Priority to CN201510001784.4A priority Critical patent/CN105820803A/en
Publication of CN105820803A publication Critical patent/CN105820803A/en

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Abstract

The invention provides a workover fluid and its preparation method and application. The workover fluid comprises, by weight, 0.4-0.8% of a wool agent, 1.0-2.0% of a stratification agent, 0.1-0.3% of a nucleating agent, 0.2-0.5% of a film-forming agent, 0.5-1.0% of a deoxidant, 0.1-0.2% of a bactericide, 3.0-5.0% of potassium chloride, 0.5-1.0% of a high-temperature stabilizer, 0.5-1.0% of a hydrogen sulfide removal agent, 0.1-0.2% of a corrosion inhibitor, 0.5-1.0% of an anti-water blocking agent, 0.5-1.0% of a discharge aiding agent and 86-93% of water. The workover fluid provided by the invention has high stability, good sand-carrying performance, strong discharge aiding capability and small formation damage, and can be used for effective temporary plugging of stratum. Therefore, the technical problem of leakage phenomenon which still exists during well repairing of absorption wells of reservoirs with low pressure and low permeability due to reduction of workover fluid density in the prior art is solved.

Description

Workover fluid and its preparation method and application

Technical field

The present invention relates to a kind of oilfield additive technical field, particularly to the workover fluid and its preparation method and application of a kind of low-pressure low-permeability reservoir.

Background technology

Well workover is one and normally produces or improve the releasing fault that production capacity is carried out, the work improving borehole condition by recovering Oil/gas Well; and the working solution used in workover treatment process is referred to as workover fluid; workover fluid ensure that construction safety operation and prevents workover fluid to formation leakage; play the effect of protection reservoir; at present; workover fluid is broadly divided into foam workover fluid system, solid phase blocks up type workover fluid system temporarily, glue workover fluid system, alkyl workover fluid system, gel-type workover fluid and clear brine workover fluid.

For low-pressure low-permeability reservoir, fractured leakage is big, oil reservoir energy deficit is serious, substantial amounts of hydraulic slip is produced in completion and workover treatment, not only polluted reservoir, also bring great economic loss, workover treatment currently for low-pressure low-permeability reservoir absorption well, one of solution is to reduce the density of workover fluid, but use fall low-density workover fluid effect in workover treatment undesirable, yet suffering from leakage phenomena, and workover fluid density reduces that rear stability is poor, the row of helping is indifferent, the infringement for stratum is relatively large.

Summary of the invention

The present invention provides a kind of workover fluid, this workover fluid has high stability, solid-carrying performance is good, the performance that the row's of helping ability is strong and little to formation damage, can effectively block leakage stratum, when solving in prior art by reducing workover fluid Density on Low-Pressure low permeability reservoir absorption well well workover, yet suffer from the technical problem of leakage phenomena.

The present invention also provides for the preparation method of a kind of workover fluid, and the method is simple to operate easily controllable.

The present invention also provides for the application in low-pressure low-permeability reservoir well workover of a kind of workover fluid, effectively stratum can be blocked up temporarily by workover fluid, the most stifled time can meet construction requirement, and this workover fluid returns row easily, and during decreasing well workover, workover fluid causes stratum damaged condition to bottom leakage.

The present invention provides a kind of workover fluid, and the mass percent of described workover fluid consists of: fine hair agent 0.4%~0.8%, stratification agent 1.0%~2.0%, nucleator 0.1%~0.3%, film former 0.2%~0.5%, oxygen scavenger 0.5%~1.0%, antibacterial 0.1%~0.2%, potassium chloride 3.0%~5.0%, high-temperature stabilizer 0.5%~1.0%, vulcanisation hydrogen agent 0.5%~1.0%, corrosion inhibiter 0.1%~0.2%, Waterproof lock agent 0.5%~1.0%, cleanup additive 0.5%~1.0% and water 86%~93%.

nullIn the workover fluid that the present invention provides,By by fine hair agent、Stratification agent、Nucleator、Film former、Oxygen scavenger、Antibacterial、Potassium chloride、High-temperature stabilizer、Vulcanisation hydrogen agent、Corrosion inhibiter、Waterproof lock agent、Cleanup additive and water are mixed to form a kind of floss capsule workover fluid system,The vesicle formed in this floss capsule workover fluid system has good pliability,The most broken,And be evenly distributed in continuous phase,When vesicle adsorbs after fracture faces,By the contraction or expansion of vesicle,Reduce pressure and the prevention acting on formation fluid、Slowing down fluid is missed,When drilling tool activity,Vesicle can convergent-divergent,Alleviate pressure,Do not have swabbing,Therefore stratum can effectively be blocked up by this workover fluid temporarily,Improve the bearing capacity on stratum simultaneously,A series of underground work operation can be implemented after the most stifled,As repaired or changing underground equipment、Envelope alters perforating job、Process the flow charts such as down hole problem,And,This workover fluid density is adjustable,Little to down-hole equipment corrosion,Antis cale ability is strong,Well can be kept to clean,Compatible with working solution system used in reservoir and original well,Plugging function can be played to a certain extent,There is good stability,Solid-carrying performance is good,The row's of helping ability is strong、Little to formation damage,The yield after well workover is conducive to recover,And improve the features such as oil yield.

In a specific embodiment of the present invention, described fine hair agent is by xanthan gum, hydroxypropyl guar forms with sodium sulfite, and described xanthan gum, described hydroxypropyl guar is 8:2:3 with the mass ratio of described sodium sulfite, described fine hair agent can stablize the floss capsule in floss capsule workover fluid system, there is consumption little, the feature that steady capsule effect is strong, fine hair agent simultaneously has regulation floss capsule workover fluid flow pattern effect, therefore, in the present invention, floss capsule workover fluid medium staple capsule can not only be effectively stablized in described fine hair agent, prevent the gas-liquid layering that floss capsule floating occurs, system shakiness situation occurs, and floss capsule workover fluid flow pattern can be regulated, make floss capsule workover fluid viscosity at high shear rates relatively low, floss capsule workover fluid is made to have good rheological characteristic, be conducive to broken rock;Viscosity is higher at low shear rates, be conducive to cutting carring, further, this fine hair agent is good with other inorganic agent compatibilities of general workover fluid, and this fine hair agent is nontoxic, harmless, it it is the inorganic agent that a kind of environmental pollution is less, in a specific embodiment, moisture≤15% of described fine hair agent, and described fine hair agent be configured to the aqueous solution that concentration is 1.0% after pH value be 6.0~7.0, apparent viscosity 10~20mPa s, floss capsule stabilization time >=24h.

In embodiment of the present invention, described stratification agent is made up of with polyanion cellulose carboxymethyl starch sodium, and the mass ratio of described carboxymethyl starch sodium and described polyanion cellulose is 2:3.

In embodiment of the present invention, moisture≤5% of described stratification agent, and described stratification agent be configured to 1% aqueous solution after pH value be 8~10, apparent viscosity 20~35mPa s, base fluid adds after stratification agent, the half-life increase >=120min of base fluid, wherein by said components tentatively prepare do not add stratification agent before liquid be referred to as base fluid, after adding stratification agent in this base fluid, by increasing capacitance it is possible to increase the half-life of base fluid.

In the workover fluid that the present invention provides, described nucleator can reduce gas-liquid surface tension force, wrap up with mechanism enter body mutually in gas, it is possible to effectively in floss utricule system, be sufficiently formed gas core, have the advantages that consumption is little, nucleation is strong, also there is the characteristics such as anti-salt, anticalcium ability are strong.

In embodiment of the present invention, described nucleator is formulated for 1:2:1:3 in mass ratio by dodecyl sodium sulfate, polyoxethylene octylphenyl phenol ether, dimethyl dodecyl amine oxide and dodecyltriethanolamine sulfate, in one embodiment of the invention, the pH value of described nucleator is 7.0~9.0, density 0.90~1.00g/cm3After adding described nucleator in base fluid, foam quality >=20% of base fluid, base fluid half-life increase >=120.0min, 10% sodium ion water bubble quality >=50%, 5% calcium ion water bubble quality >=50%, wherein, by said components tentatively prepare do not add nucleator before liquid be referred to as base fluid, the nucleator that the present invention provides is good with the inorganic agent compatibility of general workover fluid, and this nucleator is nontoxic, harmless, for a kind of less inorganic agent of environmental pollution, described nucleator is applicable to the temperature environment less than or equal to 120 DEG C.

In the workover fluid that the present invention provides, described film former can effectively reduce gas core and surface tension continuously, additionally it is possible to the height forming parcel gas core outside gas core sticks layer, it is possible to effectively prevents gas effusion in gas core, keeps gas core stable, improve floss capsule intensity.And, the film former of the present invention is good with general workover fluid inorganic agent compatibility, in one embodiment of the invention, described film former is made up of triethanolamine, ethanol and lauryl alcohol, and the mass ratio of described triethanolamine, ethanol and lauryl alcohol is 2:3:2.In embodiments of the invention, the pH value of described film former is 5.0~7.0, density 0.7~1.0g/cm3, volume compressibility >=15%.

In embodiment of the present invention, described high-temperature stabilizer is used for keeping workover fluid to keep original performance (referring mainly to rheological characteristic and leak-off) under conditions of temperature raises, in the prior art, conventional high-temperature stabilizer can be sulfonated phenol formaldehyde resin and modifier thereof, chromate, sulfonated lignite modifier, organic sulfonated polymer species, heterocycles containing sulfydryl and can prevent Organic substance from the reducing agent etc. of oxidative degradation occurring when temperature raises, in the present invention, described high-temperature stabilizer is lead stearate, described high-temperature stabilizer its advantage compared with conventional stabilizer is: this system can use in the well of layer temperature higher (the highest 120 degrees Celsius).

In the workover fluid of the present invention, described antibacterial can be formaldehyde, and described oxygen scavenger is for removing the oxygen in workover fluid mixed system, thus reduces the corrosion to equipment of the well workover process, and in the present invention, described oxygen scavenger can be ZC-L503 Shandong sponge iron deoxidizing agent;Described corrosion inhibiter is used for making not allow material increase-volume in water, it is possible to forms protecting film, thus reduces rate of corrosion, extends the life-span of product, and in the present invention, described corrosion inhibiter can be model DM-401 anti-incrustation corrosion inhibitor;In the present invention, described Waterproof lock agent can increase the contact angle of liquid phase and rock surface, reduce stagnant liquid interfacial tension, discharge opeing speed can be accelerated, thus suppression or elimination water blocking damage, wherein, described Waterproof lock agent can be low-carbon (LC) monohydric alcohol (methanol), alcohol ether (glycol monoethyl ether, ethylene glycol monobutyl ether), nonionic surfactant (alkylphenol polyoxyethylene), fluorocarbon surfactant, in the present invention, described Waterproof lock agent can be such as the Waterproof lock agent of model SL-F;Described cleanup additive is for reducing the interfacial tension between the surface tension of water and profit, improve and return speed and return scheduling degree, reduce " water lock " phenomenon to greatest extent, prevent Organic Material Blocking, prevent in-place oil and fracturing fluid emulsifying, stop formation fines migration, in the present invention, described cleanup additive can be such as model HY-207 cleanup additive, described vulcanisation hydrogen agent can remove the hydrogen sulfide in natural gas, crude oil and fuel oil, and mercaptan, itself and hydrogen sulfide generation irreversible reaction, in the present invention, vulcanisation hydrogen agent can be sodium hydroxide.

The present invention also provides for the preparation method of above-mentioned adsorbing material, including procedure below:

nullWater is added in retort,Sequentially add fine hair agent、Stratification agent、Nucleator、Film former、Oxygen scavenger、Antibacterial、Potassium chloride、High-temperature stabilizer、Vulcanisation hydrogen agent、Corrosion inhibiter、Waterproof lock agent and cleanup additive,And low whipping speed is to stir under the conditions of 5000rpm to each component to be completely dissolved,Wherein,Described fine hair agent、Described stratification agent、Nucleator、Film former、Oxygen scavenger、Antibacterial、Potassium chloride、High-temperature stabilizer、Vulcanisation hydrogen agent、Corrosion inhibiter、Waterproof lock agent、The mass fraction of cleanup additive and water is respectively as follows: 0.4~0.8、1.0~2.0、0.1~0.3、0.2~0.5、0.5~1.0、0.1~0.2、3.0~5.0、0.5~1.0、0.5~1.0、0.1~0.2、0.5~1.0、0.5~1.0、86~93.

In one concrete scheme of the present invention, described method also includes xanthan gum, described fine hair agent made by hydroxypropyl guar and sodium sulfite, wherein xanthan gum, hydroxypropyl guar is 8:2:3 with the mass ratio of sodium sulfite, in the present invention, moisture≤15% of described fine hair agent, and described fine hair agent be configured to the aqueous solution that concentration is 1.0% after pH value be 6.0~7.0, apparent viscosity 10~20mPa s, floss capsule stabilization time >=24h, floss capsule workover fluid medium staple capsule can not only be effectively stablized in the described fine hair agent of preparation, prevent the gas-liquid layering that floss capsule floating occurs, system shakiness situation occurs, and floss capsule workover fluid flow pattern can be regulated, make floss capsule workover fluid viscosity at high shear rates relatively low, floss capsule workover fluid is made to have good rheological characteristic, be conducive to broken rock;Viscosity is higher at low shear rates, beneficially cutting carring, and, this fine hair agent is good with other inorganic agent compatibilities of general workover fluid, and this fine hair agent is nontoxic, harmless, is the inorganic agent that a kind of environmental pollution is less.

In one concrete scheme of the present invention, described method also includes carboxymethyl starch sodium and polyanion cellulose are made described stratification agent, wherein, carboxymethyl starch sodium is 2:3 with the mass ratio of polyanion cellulose, moisture≤5% of described stratification agent, and described stratification agent be configured to 1% aqueous solution after pH value be 8~10, apparent viscosity 20~35mPa s, after adding stratification agent in base fluid, half-life increase >=120min.

In one concrete scheme of the present invention, described method also includes dodecyl sodium sulfate, polyoxethylene octylphenyl phenol ether, dimethyl dodecyl amine oxide and dodecyltriethanolamine sulfate make described nucleator for 1:2:1:3 in mass ratio, described nucleator can reduce gas-liquid surface tension force, wrap up and enter body interior gas mutually with mechanicals efforts, effectively can be sufficiently formed gas core in floss utricule system, there is consumption little, the feature that nucleation is strong, also there is anti-salt, the characteristics such as anticalcium ability is strong, the pH value of described nucleator is 7.0~9.0, density 0.90~1.00g/cm3Nucleator is added in base fluid, foam quality >=20% of base fluid, base fluid half-life increase >=120.0min, 10% sodium ion water bubble quality >=50%, 5% calcium ion water bubble quality >=50%, the nucleator that the present invention provides is good with the inorganic agent compatibility of general workover fluid, and this nucleator is nontoxic, harmless, for a kind of less inorganic agent of environmental pollution, described nucleator is applicable to the temperature environment less than or equal to 120 DEG C.

In one concrete scheme, described method also includes for 2:3:2, triethanolamine, ethanol and lauryl alcohol are made described film former in mass ratio, described film former can effectively reduce gas core and surface tension continuously, the height that can also form parcel gas core outside gas core sticks layer, can effectively prevent gas effusion in gas core, keep gas core stable, improve floss capsule intensity.Further, the film former of the present invention is good with general workover fluid inorganic agent compatibility, and in the present invention, the pH value of described film former is 5.0~7.0, density 0.7~1.0g/cm3, volume compressibility >=15%.

Described high-temperature stabilizer is used for keeping workover fluid to keep original performance (referring mainly to rheological characteristic and leak-off) under conditions of temperature raises, in the prior art, conventional high-temperature stabilizer can be sulfonated phenol formaldehyde resin and modifier thereof, chromate, sulfonated lignite modifier, organic sulfonated polymer species, heterocycles containing sulfydryl and can prevent Organic substance from the reducing agent etc. of oxidative degradation occurring when temperature raises, in the present invention, described high-temperature stabilizer is lead stearate, described high-temperature stabilizer its advantage compared with conventional stabilizer is: this system can use in the well of layer temperature higher (the highest 120 degrees Celsius).

In one concrete scheme, described antibacterial can be formaldehyde, and described oxygen scavenger is for removing the oxygen in workover fluid mixed system, thus reduces the corrosion to equipment of the well workover process, and in the present invention, described oxygen scavenger can be ZC-L503 Shandong sponge iron deoxidizing agent;Described corrosion inhibiter is used for making not allow material increase-volume in water, it is possible to forms protecting film, thus reduces rate of corrosion, extends the life-span of product, and in the present invention, described corrosion inhibiter can be model DM-401 anti-incrustation corrosion inhibitor;In the present invention, described Waterproof lock agent can increase the contact angle of liquid phase and rock surface, reduce stagnant liquid interfacial tension, discharge opeing speed can be accelerated, thus suppression or elimination water blocking damage, wherein, described Waterproof lock agent can be low-carbon (LC) monohydric alcohol (methanol), alcohol ether (glycol monoethyl ether, ethylene glycol monobutyl ether), nonionic surfactant (alkylphenol polyoxyethylene), fluorocarbon surfactant, in the present invention, described Waterproof lock agent can be such as the Waterproof lock agent of model SL-F;Described cleanup additive is for reducing the interfacial tension between the surface tension of water and profit, improve and return speed and return scheduling degree, reduce " water lock " phenomenon to greatest extent, prevent Organic Material Blocking, prevent in-place oil and fracturing fluid emulsifying, stop formation fines migration, in the present invention, described cleanup additive can be such as model HY-207 cleanup additive, described vulcanisation hydrogen agent can remove the hydrogen sulfide in natural gas, crude oil and fuel oil, and mercaptan, itself and hydrogen sulfide generation irreversible reaction, in the present invention, vulcanisation hydrogen agent can be sodium hydroxide.

The present invention provides the workover fluid as above application in low-pressure low-permeability reservoir well workover.

As aforementioned, the workover fluid of the present invention is by fine hair agent, stratification agent, nucleator, film former, oxygen scavenger, antibacterial, potassium chloride, high-temperature stabilizer, vulcanisation hydrogen agent, corrosion inhibiter, Waterproof lock agent, cleanup additive and water are mixed to form a kind of floss capsule workover fluid system, the vesicle formed in this floss capsule workover fluid system has good pliability, the most broken, and be evenly distributed in continuous phase, when vesicle adsorbs after fracture faces, by the contraction or expansion of vesicle, reduce pressure and the prevention acting on formation fluid, slowing down fluid is missed, therefore, workover fluid prepared by the present invention is be applicable to low-pressure low-permeability reservoir absorption well workover treatment, test display, leak stopping for low-pressure low-permeability reservoir absorption well has good effect.

In the present invention, workover fluid as above can be applied in low-pressure low-permeability reservoir absorption well workover treatment, can also be widely used for low pressure sandstone, low pressure fractured reservoirs, low pressure heavy crude reservoir equal-pressure-difference is big, easily occur the oil reservoir of severe leakage to examine pump, sand-flushing operation, wherein, when described workover fluid is applied in low-pressure low-permeability reservoir well workover, detailed process is:

1) salvaging reducer in well, Specific construction step and requirement salvage arrangement and method for construction with reference to existing reducer;

2) carry out driving a well before kill-job open flow, and pressure release is to safety value;

3) kill-job, lift pipe string;

Wherein, if reducer is salvaged successfully, then use crossover-circulating type method kill-job;If reducer is salvaged unsuccessful, then use squeezing method kill-job, the workover fluid of above-mentioned preparation is injected from oil jacket annular space, during kill-job, control outlet well, record wastage, observe 12 hours after kill-job, if showing without overflow, reacting cycle well-flushing one week, after showing without gas, lay down christmas tree and install 2FZ18-35 preventer, preventer pressure testing are closed in examination, trip-out operation is carried out after qualified, trip out tubing string in well, rise while pour into workover fluid, liquid level remains at well head, in trip-out process, control trip-out speed, pit shaft filled by every 3 posts, when playing major diameter drilling tool, trip-out speed must be controlled, after rising, 40 oil pipes control speed is 5-10m/min, observe accurate recording grouting amount, prevent leakage, well kick, H is carried out in kill-job and trip-out process2The monitoring of S gas, and carry out a people's air defense H2The safety measure of S poisoning.

nullThe present invention provides a kind of workover fluid,By by fine hair agent、Described stratification agent、Nucleator、Film former、Oxygen scavenger、Antibacterial、Potassium chloride、High-temperature stabilizer、Vulcanisation hydrogen agent、Corrosion inhibiter、Waterproof lock agent、Cleanup additive and water form a kind of floss capsule workover fluid system according to certain mass percent mixing,The vesicle formed in this floss capsule workover fluid system has good pliability,The most broken,And be evenly distributed in continuous phase,When vesicle adsorbs after fracture faces,By the contraction or expansion of vesicle,Reduce pressure and the prevention acting on formation fluid、Slowing down fluid is missed,The technical problem of leakage phenomena is yet suffered from when solving in prior art by reducing workover fluid Density on Low-Pressure low permeability reservoir absorption well well workover,The present invention also provides for the preparation method of a kind of workover fluid,Synchronization implementation fine hair agent、Stratification agent、Nucleator and the preparation of film former and oxygen scavenger、Antibacterial、Potassium chloride、High-temperature stabilizer、Vulcanisation hydrogen agent、Corrosion inhibiter、Waterproof lock agent、Cleanup additive and the workover fluid being mixed to get the present invention of water,Preparation is simple for this,The workover fluid of preparation has high stability,Solid-carrying performance is good,The performance that the row's of helping ability is strong and little to formation damage,The present invention is by applying workover fluid in terms of low-pressure low-permeability reservoir well workover,Effectively stratum can be blocked up temporarily,The most stifled time can meet construction requirement,And this workover fluid returns row easily,During decreasing well workover, workover fluid causes stratum damaged condition to bottom leakage.

Detailed description of the invention

For making the purpose of the embodiment of the present invention, technical scheme and advantage clearer, below in conjunction with the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that, described embodiment is a part of embodiment of the present invention rather than whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art are obtained under not making creative work premise, broadly fall into the scope of protection of the invention.

Embodiment 1

First, xanthan gum, hydroxypropyl guar are made described fine hair agent for 8:2:3 in mass ratio with sodium sulfite;Carboxymethyl starch sodium and polyanion cellulose are made described stratification agent for 2:3 in mass ratio;Dodecyl sodium sulfate, polyoxethylene octylphenyl phenol ether, dimethyl dodecyl amine oxide and dodecyltriethanolamine sulfate are made described nucleator for 1:2:1:3 in mass ratio;Triethanolamine, ethanol and lauryl alcohol are made described film former for 2:3:2 in mass ratio;

Then, take 895g water and add in retort, again by charging hopper be sequentially added in retort above-mentioned prepare fine hair agent 5g, above-mentioned prepare stratification agent 15g, above-mentioned prepare nucleator 2g, above-mentioned film former 3g, 7g oxygen scavenger, 1.5g antibacterial, 40g potassium chloride, 8g high-temperature stabilizer, 8g vulcanisation hydrogen agent, 1.5g corrosion inhibiter, 7g Waterproof lock agent and the 7g cleanup additive prepared, low whipping speed controls to be stirred raw material being completely dissolved to each component under the conditions of 5000rpm, i.e. prepare the workover fluid of the present invention.

Being tested by the workover fluid of preparation in embodiment 1, determine density, pH, plastic viscosity, yield value, static wastage and dynamic wastage respectively, its measurement result is as shown in table 1:

Table 1 embodiment 1 workover fluid performance test table

Project Requirement Test value Density, g/cm3 0.90~1.00 0.96 PH value 9~11 10 Plastic viscosity, mPa s 10~30 11 Yield value, Pa 10~20 10 5Mpa static state wastage, mL/30min ≤10 0 Dynamically wastage, mL/30min ≤10 0

Wherein, the density of workover fluid is that the workover fluid fluid density meter measurement by suitable range obtains;The pH value of workover fluid is that reference standard color range reads by dipping well workover drop on pH reagent paper with cleaned glass rod;The plastic viscosity of workover fluid and the mensuration process of yield value are as follows:

Using Qingdao with spring oil Instrument Ltd. ZNN-D6 type rotating cylinder viscometer, this viscometer is the rotary-type instrument with motor as power, is placed in by workover fluid in the annular space between two concentric drums.nullUrceolus (or claiming rotating cylinder) rotates with constant speed (rpm),Workover fluid rotates in urceolus inner core (or claiming suspending hammer) is produced moment of torsion,Torque spring stops the rotation of inner core,And the displacement of the dial plate instruction inner core being connected with inner core,Wherein,Rotating cylinder viscometer maximum operating temperature is 93 DEG C,Such as the temperature the to be measured workover fluid higher than 93 DEG C,The hollow metal inner core that solid metal inner core or inside are completely dried should be used,Because when being immersed in high temperature workover fluid,Liquid within hollow inner core may evaporate and cause rupturing of inner core,During measuring, measure and record the temperature of workover fluid,By DEG C in units of represent,Inject a sample in viscometer,And make rotating cylinder just immerse to graduation mark,Open viscometer,Regulation rotating speed is at 600rpm shelves,After dial plate readings is constant,Read and recording meter panel readings,Regulation rotating speed is at 300rpm shelves,After dial plate readings is constant,Read and recording meter panel readings,Then according to following formula (1) and (2) computational plasticity viscosity respectively、Yield value:

PV=θ600300(1)

YP = 1 2 ( θ 300 - PV ) - - - ( 2 )

In formula: PV is plastic viscosity, mPa s;YP is yield value, Pa;θ600、θ300For constant readings when 600rpm, 300rpm.

The leak stopping performance test process of workover fluid is as follows:

Static leaking stoppage experiment: use the Inst of Drilling-Well Technology, Huabei Petroleum Administration DLM-01A type sealing Analog Device improved, selects 40~60 mesh sand to do casting bed leaking stoppage experiment, adds and drives pressure 5.5MPa, back pressure 0.5MPa, record wastage and plugging time.

Dynamically leaking stoppage experiment: use Hai'an oil scientific research Instrument Ltd. loose sand productivity simulation system, choose permeability less than 0.5~1 μm2Rock core leaking stoppage experiment is done in formation core or people's lithogenesis, adds and drives pressure 5.5MPa, back pressure 0.5MPa, shear rate 300s-1, record wastage and plugging time.

As can be seen from the above Table 1, the density of workover fluid prepared by the present invention is 0.96g/cm3, pH value be 10, plastic viscosity 11mPa s, yield value be 10Pa, static wastage and dynamic wastage are all 0, the workover fluid indices of the present invention all meets design requirement, and, the static wastage of workover fluid and dynamic wastage are all 0, therefore, the workover fluid that the present invention provides is capable of preferable plugging effect.

Embodiment 2

First, xanthan gum, hydroxypropyl guar are made described fine hair agent for 8:2:3 in mass ratio with sodium sulfite;Carboxymethyl starch sodium and polyanion cellulose are made described stratification agent for 2:3 in mass ratio;Dodecyl sodium sulfate, polyoxethylene octylphenyl phenol ether, dimethyl dodecyl amine oxide and dodecyltriethanolamine sulfate are made described nucleator for 1:2:1:3 in mass ratio;Triethanolamine, ethanol and lauryl alcohol are made described film former for 2:3:2 in mass ratio;

Then take 926g water and add in retort, in retort, the fine hair agent 4g of above-mentioned preparation, the stratification agent 10g of above-mentioned preparation, the nucleator 1g of above-mentioned preparation, film former 2g, 5g oxygen scavenger of above-mentioned preparation, 1g antibacterial, 30g potassium chloride, 5g high-temperature stabilizer, 5g vulcanisation hydrogen agent, 1g corrosion inhibiter, 5g Waterproof lock agent and 5g cleanup additive it is sequentially added into again by charging hopper, low whipping speed controls to be stirred raw material being completely dissolved to each component under the conditions of 5000rpm, i.e. prepare the workover fluid of the present invention.

By the workover fluid of preparation in embodiment 2 through test, determining density, pH, plastic viscosity, yield value, static wastage and dynamic wastage respectively, its measurement result is as shown in table 2:

Table 2 embodiment 2 workover fluid performance test table

Project Requirement Test value Density, g/cm3 0.85~0.90 0.87 PH value 9~11 10 Plastic viscosity, mPa s 10~30 14 Yield value, Pa 10~20 12 5Mpa static state wastage, mL/30min ≤10 0 Dynamically wastage, mL/30min ≤10 0

Wherein, the density of workover fluid is that the workover fluid fluid density meter measurement by suitable range obtains;The pH value of workover fluid is that reference standard color range reads by dipping well workover drop on pH reagent paper with cleaned glass rod;The plastic viscosity of workover fluid and the mensuration process of yield value are as follows:

During measuring, measure and record the temperature of workover fluid, by DEG C in units of represent, inject a sample in viscometer, and make rotating cylinder just immerse to graduation mark, open viscometer, regulation rotating speed is at 600rpm shelves, after dial plate readings is constant, reads and recording meter panel readings, regulation rotating speed is at 300rpm shelves, after dial plate readings is constant, read and recording meter panel readings, then according to following formula (1) and (2) computational plasticity viscosity, yield value respectively:

PV=θ600300(1)

YP = 1 2 ( θ 300 - PV ) - - - ( 2 )

In formula: PV is plastic viscosity, mPa s;YP is yield value, Pa;θ600、θ300For constant readings when 600rpm, 300rpm.

The leak stopping performance test process of workover fluid is as follows:

Static leaking stoppage experiment: use the Inst of Drilling-Well Technology, Huabei Petroleum Administration DLM-01A type sealing Analog Device improved, selects 40~60 mesh sand to do casting bed leaking stoppage experiment, adds and drives pressure 5.5MPa, back pressure 0.5MPa, record wastage and plugging time.

Dynamically leaking stoppage experiment: use Hai'an oil scientific research Instrument Ltd. loose sand productivity simulation system, choose permeability less than 0.5~1 μm2Rock core leaking stoppage experiment is done in formation core or people's lithogenesis.Add and drive pressure 5.5MPa, back pressure 0.5MPa, shear rate 300s-1, record wastage and plugging time.

As can be seen from the above Table 2, the density of workover fluid prepared by the present invention is 0.87g/cm3, pH value be 10, plastic viscosity 14mPa s, yield value be 12Pa, static wastage and dynamic wastage are all 0, the workover fluid indices of the present invention all meets design requirement, and, the static wastage of workover fluid and dynamic wastage are all 0, therefore, the workover fluid that the present invention provides is capable of preferable plugging effect.

Embodiment 3

First, xanthan gum, hydroxypropyl guar are made described fine hair agent for 8:2:3 in mass ratio with sodium sulfite;Carboxymethyl starch sodium and polyanion cellulose are made described stratification agent for 2:3 in mass ratio;Dodecyl sodium sulfate, polyoxethylene octylphenyl phenol ether, dimethyl dodecyl amine oxide and dodecyltriethanolamine sulfate are made described nucleator for 1:2:1:3 in mass ratio;Triethanolamine, ethanol and lauryl alcohol are made described film former for 2:3:2 in mass ratio;

Then, take 860g water and add in retort, in retort, the fine hair agent 8g of above-mentioned preparation, the stratification agent 20g of above-mentioned preparation, the nucleator 3g of above-mentioned preparation, film former 5g, 10g oxygen scavenger of above-mentioned preparation, 2g antibacterial, 50g potassium chloride, 10g high-temperature stabilizer, 10g vulcanisation hydrogen agent, 2g corrosion inhibiter, 10g Waterproof lock agent and 10g cleanup additive it is sequentially added into again by charging hopper, low whipping speed controls to be stirred raw material being completely dissolved to each component under the conditions of 5000rpm, i.e. prepare the workover fluid of the present invention.

By the workover fluid of preparation in embodiment 3 through test, determining density, pH, plastic viscosity, yield value, static wastage and dynamic wastage respectively, its measurement result is as shown in table 3:

Table 3 embodiment 3 workover fluid performance test table

Project Requirement Test value Density, g/cm3 0.75~0.85 0.84 PH value 9~11 10 Plastic viscosity, mPa s 10~30 20 Yield value, Pa 10~20 17 5Mpa static state wastage, mL/30min ≤10 0 Dynamically wastage, mL/30min ≤10 0

Wherein, the density of workover fluid is that the workover fluid fluid density meter measurement by suitable range obtains;The pH value of workover fluid is that reference standard color range reads by dipping well workover drop on pH reagent paper with cleaned glass rod;The plastic viscosity of workover fluid and the mensuration process of yield value are as follows:

Using Qingdao with spring oil Instrument Ltd. ZNN-D6 type rotating cylinder viscometer, this viscometer is the rotary-type instrument with motor as power, is placed in by workover fluid in the annular space between two concentric drums.nullUrceolus (or claiming rotating cylinder) rotates with constant speed (rpm),Workover fluid rotates in urceolus inner core (or claiming suspending hammer) is produced moment of torsion,Torque spring stops the rotation of inner core,And the displacement of the dial plate instruction inner core being connected with inner core,Wherein,Rotating cylinder viscometer maximum operating temperature is 93 DEG C,Such as the temperature the to be measured workover fluid higher than 93 DEG C,The hollow metal inner core that solid metal inner core or inside are completely dried should be used,Because when being immersed in high temperature workover fluid,Liquid within hollow inner core may evaporate and cause rupturing of inner core,During measuring, measure and record the temperature of workover fluid,By DEG C in units of represent,Inject a sample in viscometer,And make rotating cylinder just immerse to graduation mark,Open viscometer,Regulation rotating speed is at 600rpm shelves,After dial plate readings is constant,Read and recording meter panel readings,Regulation rotating speed is at 300rpm shelves,After dial plate readings is constant,Read and recording meter panel readings,Then according to following formula (1) and (2) computational plasticity viscosity respectively、Yield value:

PV=θ600300(1)

YP = 1 2 ( θ 300 - PV ) - - - ( 2 )

In formula: PV is plastic viscosity, mPa s;YP is yield value, Pa;θ600、θ300For constant readings when 600rpm, 300rpm.

The leak stopping performance test process of workover fluid is as follows:

Static leaking stoppage experiment: use the Inst of Drilling-Well Technology, Huabei Petroleum Administration DLM-01A type sealing Analog Device improved, selects 40~60 mesh sand to do casting bed leaking stoppage experiment, adds and drives pressure 5.5MPa, back pressure 0.5MPa, record wastage and plugging time.

Dynamically leaking stoppage experiment: use Hai'an oil scientific research Instrument Ltd. loose sand productivity simulation system, choose permeability less than 0.5~1 μm2Rock core leaking stoppage experiment is done in formation core or people's lithogenesis.Add and drive pressure 5.5MPa, back pressure 0.5MPa, shear rate 300s-1, record wastage and plugging time.

From the experimental result of above-mentioned table 3 it can be seen that the density of workover fluid prepared by the present invention is 0.84g/cm3, pH value be 10, plastic viscosity 20mPa s, yield value be 17Pa, static wastage and dynamically wastage be all 0, the workover fluid indices of the present invention all meets design requirement, and, the static wastage of workover fluid and dynamic wastage are all 0, therefore, the workover fluid that the present invention provides is capable of preferable plugging effect.

Experimental example

The workover fluid that embodiment 1 is prepared from is applied in Soviet Union and Eastern Europe's 25-57 well, wherein Soviet Union and Eastern Europe 25-57 well is Soviet Union's Sulige gas field East development well in 2008, this well JIUYUE in 2008 is spudded on the 30th, finishing drilling on October 19 in 2008, finishing drilling well depth 3127.10 meters, Benxi, finishing drilling layer position group, Soviet Union and Eastern Europe's 25-57 well input reducer on April 3rd, 2009 produces, deep 1900m under reducer, initial stage daily output tolerance is 1.5901 × 104m3/d.Through the production of 4 years, current casing pressure 6.8MPa, yield 0.1 × 104m3/ d, cumulative gas 1173.9 × 104m3/d.Owing to the current condition of production of this well is poor, there is the geological conditions not produced preferable layer position, in order to improve this well gas production, the interval having productive potentialities to this well carries out mending layer perforation, fracturing reform, being applied in workover treatment by the workover fluid that embodiment 1 is prepared from, specific experiment process and result are as follows:

1) reducer is salvaged;

Reducer in well is salvaged by tissue, and Specific construction step and requirement salvage arrangement and method for construction with reference to reducer.Throttle positions is 1900m, and during to construct, reality depth sounding degree is as the criterion.

2) drive a well open flow;

Carry out driving a well before kill-job open flow, and pressure release is to safety value.

3) kill-job, lift pipe string;

A) kill-job mode: if reducer is salvaged successfully, then use crossover-circulating type method kill-job;If reducer is salvaged unsuccessful, then use squeezing method kill-job, inject workover fluid from oil jacket annular space.

B) during kill-job, control outlet well, recorded wastage, observe 12 hours after kill-job, if show without overflow, reacting cycle well-flushing one week, after showing without gas, lay down christmas tree and install 2FZ18-35 preventer, try pass preventer pressure testing, qualified after carry out trip-out operation.

C) tripping out tubing string in well, rise while pour into workover fluid, liquid level remains at well head.

D) in trip-out process, controlling trip-out speed, pit shaft filled by every 3 posts.When playing major diameter drilling tool, it is necessary to control trip-out speed, after rising, 40 oil pipes control speed are 5-10 m/min, observe accurate recording grouting amount, prevent leakage, well kick.

E) in kill-job and trip-out process, H is carried out2The monitoring of S gas, and carry out a people's air defense H2The safety measure of S poisoning.

Through measuring, finally give the workover fluid of embodiment 1 when applying in Soviet Union and Eastern Europe 25-57 well well workover, workover fluid monolayer quantity is less than 5 sides, and leak rate less than 0.3 side/hour, it is 100% that the row of returning leads, therefore, stratum can effectively be blocked up by workover fluid that the present invention provides temporarily, the most stifled time can meet construction requirement, and this workover fluid consumption is less, the row of returning easy, and during decreasing well workover, workover fluid causes stratum damaged condition to bottom leakage.

Last it is noted that various embodiments above is only in order to illustrate technical scheme, it is not intended to limit;Although the present invention being described in detail with reference to foregoing embodiments, it will be understood by those within the art that: the technical scheme described in foregoing embodiments still can be modified by it, or the most some or all of technical characteristic is carried out equivalent;And these amendments or replacement, do not make the essence of appropriate technical solution depart from the scope of various embodiments of the present invention technical scheme.

Claims (16)

1. a workover fluid, it is characterized in that, the mass percent of described workover fluid consists of: fine hair agent 0.4%~0.8%, stratification agent 1.0%~2.0%, nucleator 0.1%~0.3%, film former 0.2%~0.5%, oxygen scavenger 0.5%~1.0%, antibacterial 0.1%~0.2%, potassium chloride 3.0%~5.0%, high-temperature stabilizer 0.5%~1.0%, vulcanisation hydrogen agent 0.5%~1.0%, corrosion inhibiter 0.1%~0.2%, Waterproof lock agent 0.5%~1.0%, cleanup additive 0.5%~1.0% and water 86%~93%.
Workover fluid the most according to claim 1, it is characterised in that described fine hair agent is made up of with sodium sulfite xanthan gum, hydroxypropyl guar, and the mass ratio of described xanthan gum, described hydroxypropyl guar and described sodium sulfite is 8:2:3.
Workover fluid the most according to claim 2, it is characterised in that moisture≤15% of described fine hair agent, and described fine hair agent be configured to the aqueous solution that concentration is 1.0% after pH value be 6.0~7.0, apparent viscosity 10~20mPa s, floss capsule stabilization time >=24h.
4. according to the workover fluid described in claim 1 or 3, it is characterised in that described stratification agent is made up of with polyanion cellulose carboxymethyl starch sodium, and the mass ratio of described carboxymethyl starch sodium and described polyanion cellulose is 2:3.
Workover fluid the most according to claim 4, it is characterised in that moisture≤5% of described stratification agent, and described stratification agent be configured to 1% aqueous solution after pH value be 8~10, apparent viscosity 20~35mPa s.
6. according to the workover fluid described in claim 1 or 3, it is characterized in that, described nucleator is formulated for 1:2:1:3 in mass ratio by dodecyl sodium sulfate, polyoxethylene octylphenyl phenol ether, dimethyl dodecyl amine oxide and dodecyltriethanolamine sulfate.
Workover fluid the most according to claim 6, it is characterised in that the pH value of described nucleator is 7.0~9.0, density 0.90~1.00g/cm3
8. according to the workover fluid described in claim 1 or 3, it is characterised in that described film former is that 2:3:2 is formulated by triethanolamine, ethanol and lauryl alcohol in mass ratio.
Workover fluid the most according to claim 8, it is characterised in that the pH value of described film former is 5.0~7.0, density 0.7~1.0g/cm3, volume compressibility >=15%.
Workover fluid the most according to claim 1, it is characterised in that described high-temperature stabilizer is lead stearate, described antibacterial is formaldehyde.
The preparation method of the workover fluid described in 11. any one of claim 1-10, it is characterised in that include procedure below:
nullWater is added in retort,Sequentially add fine hair agent、Stratification agent、Nucleator、Film former、Oxygen scavenger、Antibacterial、Potassium chloride、High-temperature stabilizer、Vulcanisation hydrogen agent、Corrosion inhibiter、Waterproof lock agent and cleanup additive,And low whipping speed is to stir under the conditions of 5000rpm to each component to be completely dissolved,Wherein,Described fine hair agent、Described stratification agent、Nucleator、Film former、Oxygen scavenger、Antibacterial、Potassium chloride、High-temperature stabilizer、Vulcanisation hydrogen agent、Corrosion inhibiter、Waterproof lock agent、The mass fraction of cleanup additive and water is respectively as follows: 0.4~0.8、1.0~2.0、0.1~0.3、0.2~0.5、0.5~1.0、0.1~0.2、3.0~5.0、0.5~1.0、0.5~1.0、0.1~0.2、0.5~1.0、0.5~1.0、86~93.
12. preparation methoies according to claim 11, it is characterised in that described method also includes for 8:2:3, xanthan gum, hydroxypropyl guar are made described fine hair agent in mass ratio with sodium sulfite.
13. according to the preparation method described in claim 11 or 12, it is characterised in that described method also includes for 2:3, carboxymethyl starch sodium and polyanion cellulose are made described stratification agent in mass ratio.
14. according to the preparation method described in claim 11 or 12, it is characterized in that, described method also includes for 1:2:1:3, dodecyl sodium sulfate, polyoxethylene octylphenyl phenol ether, dimethyl dodecyl amine oxide and dodecyltriethanolamine sulfate are made described nucleator in mass ratio.
15. according to the preparation method described in claim 11 or 12, it is characterised in that described method also includes for 2:3:2, triethanolamine, ethanol and lauryl alcohol are made described film former in mass ratio.
The application in low-pressure low-permeability reservoir well workover of the workover fluid described in 16. any one of claim 1-10.
CN201510001784.4A 2015-01-04 2015-01-04 Workover fluid and preparation method and application thereof CN105820803A (en)

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