CN105804696B - A kind of process of produced-water reinjection main line alternative expression snaking - Google Patents
A kind of process of produced-water reinjection main line alternative expression snaking Download PDFInfo
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- CN105804696B CN105804696B CN201610137976.2A CN201610137976A CN105804696B CN 105804696 B CN105804696 B CN 105804696B CN 201610137976 A CN201610137976 A CN 201610137976A CN 105804696 B CN105804696 B CN 105804696B
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- pipeline
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Classifications
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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
- E21B41/00—Equipment or details not covered by groups E21B15/00 - E21B40/00
- E21B41/005—Waste disposal systems
- E21B41/0057—Disposal of a fluid by injection into a subterranean formation
-
- 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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/20—Displacing by water
Abstract
The present invention discloses a kind of process of produced-water reinjection main line alternative expression snaking, comprises the following steps：A, the construct length of pipeline needed, pipeline internal diameter, pipeline volume, pipeline scaling situation, operation pressure, operational discharge capacity are collected；B, water-tank lorry, Hydraulic vehicle, hot car washing, pressure windmill are chosen；C, the pressure in pipeline is all discharged；D, by the way that windmill is pressed to blow out the water in pipeline；E, in-line injects preset liquid；F, the preset liquid in pipeline is cleaned out with clear water；G, in-line injects I grade of cleaning solution；H, and then again I grade of cleaning solution in pipeline is cleaned out with clear water；I, in-line injects II grade of cleaning solution；J, II grade of cleaning solution complete liquidation in pipeline is gone out with clear water after；K, step G to J is repeated according to pipeline scaling situation；L, in-line is blown into steel ball, is steeply risen if there is pressure, repeats step G to J, if not occurring, continues next step；M, displacement fluid clean-up line.
Description
Technical field
The invention belongs to oil-field flooding technical field more particularly to a kind of technique sides of produced-water reinjection main line alternative expression snaking
Method.
Background technology
The recovered water in oil field is the byproduct generated in oil extraction process, and crude oil is by three phase separator and settling tank
Demulsification and natural subsidence effect, pure oil and recovered water are separated, and the recovered water after separation is by the elevator pump of cesspool to dirty
Water pot adds the processing of the drugs such as fungicide, antisludging agent by natural subsidence and in surge tank, is carried out eventually by water injecting pump
Purpose stratum is recycled into, achievees the purpose that recycling.Recovered water is mainly characterized by salinity height, and there are a certain amount of sewage to contain
Oil and impurity, since the temperature of sewage operation is up to 48 DEG C, treated, and extraction water salinity variation is little, exists at the scene
The problem of serious scale, water filling main line is caused to block and replace frequently, financial cost itself is high due to high pressure water injection pipeline, in addition
The expenses such as related land reparation, artificial, extremely uneconomical and long construction period seriously affect being normally carried out for waterflood management work.
In addition, the replacement emptying of water filling main line, makes the seriously polluted of on-site soil, environmentally friendly hidden danger is larger.
At present, due to there is mixed water injection of removing contamination in water injection technology, the dirty sample that scene is shown is a variety of mixing dirts, often
The snaking technique of rule cannot effectively solve the problems, such as this, while also without a kind of snaking technique specifically for high pressure water injection main line
Pin, number of patent application 201020588617.7 propose a kind of ultrasonic wave passivation on line device based on multi-purpose station sewage pipeline,
But the thinking of the type is included in the electromagnetism preventing fouling used in gathering line, actual effect be it is barely satisfactory, not
It can achieve the purpose that delay and solve fouling, while base operating personnel can not complete some technical things, not possess
The economic value and potentiality of popularization.
The content of the invention
The technical problems to be solved by the invention are a kind of can to delay the service life of water filling main line and ensure high pressure injection
The process of the produced-water reinjection main line alternative expression snaking of the normal economical operation of water main line.
Technical solution is used by the present invention solves above-mentioned technical problem：A kind of produced-water reinjection main line alternative expression snaking
Process comprises the following steps:
A, the construct length of pipeline needed, pipeline internal diameter, pipeline volume, pipeline scaling situation, operation pressure, construction are collected
Discharge capacity；
B, according to the above-mentioned data decimation water-tank lorry being collected into, Hydraulic vehicle, hot car washing, pressure windmill；
C, the pressure in pipeline is all discharged；
D, by the way that windmill is pressed all to purge out the water in pipeline, and water is all discharged into cesspool；
E, in-line injects 40 DEG C of preset liquid, and preset liquid in-line reacts 30 minutes；
F, the preset liquid complete liquidation in pipeline is gone out with 40 DEG C of clear water, and preset liquid and clear water is all discharged into
In cesspool；
G, in-line injects 55 DEG C of I grade of cleaning solution, and reacts one hour；
H, and then again I grade of cleaning solution complete liquidation in pipeline is gone out with 55 DEG C of clear water, and by I grade of cleaning solution and clearly
Water is all discharged into cesspool；
I, in-line injects 70 DEG C of II grade of cleaning solution, and reacts one hour；
J, II grade of cleaning solution complete liquidation in pipeline is gone out with 70 DEG C of clear water afterwards, and by II grade of cleaning solution and clear water
All discharge into cesspool；
K, step G to J is repeated according to pipeline scaling situation；
L, in-line is blown into a steel ball more smaller than caliber after completing step K, and observes the pressure change in pipeline
Situation if occurring the situation that pressure steeply rises in pipeline, repeats step G to J, if do not occur in pipeline pressure drastically on
Situation about rising, then continue next step；
M, with discharge capacity it is finally 30m3/ h displacement fluids clean-up line 50 minutes.
It is further that the collection of the pipeline scaling situation comprises the following steps：
（1）According to the extraction water salinity and water type of block entirety, and the fouling account of the history of pipeline is used for reference, it is preliminary to judge
Scaling type；
（2）It is 5% dilute hydrochloric acid to select volume fraction respectively again, and mass fraction is 1% silver nitrate solution and mass fraction is
1% barium chloride solution determines dirty type.
It is further that the preset liquid is Wax removing agent and the aqueous solution of demulsifier.
It is further that I grade of cleaning solution is hydrochloric acid and the aqueous solution of corrosion inhibiter.
It is further that II grade of cleaning solution is edta solution.
It is further that the displacement fluid is scale preventative aqueous solution.
It is further that the clear water in the step H and J is according to 25m3The amount of/h is run 10-15 minutes.
Beneficial effects of the present invention：Advantages of the present invention：1st, the resource of base's work unit and existing is taken full advantage of
Process facility, it is workable；2nd, entire work progress, to the corrosion-free effect of pipeline；3rd, operation pressure is 7MPa or so, safe
Coefficient is high, no hidden danger；4th, for sulfate and the existing situation of a variety of mixtures of carbonate, by the way of alternation response,
The problem of equipment of mechanical scraper etc is not required, is reprocessed to pipeline, does not deposit failure and pipeline scratch, the time of cleaning is more
It is short, it is more efficient；5th, snaking medium is divided into three phases, and prepad fluid cleans up sump oil remaining in pipeline, and displacement fluid uses anti-
Dirty agent solution, plays protective effect, and guarantee is provided for the effect of snaking；6th, Trunk Line treated waste liquid is always in close
Flow is closed, and dirt is precipitated as waste liquid enters cesspool, safety and environmental protection.
Description of the drawings
Fig. 1 is the process flow diagram of the embodiment of the present invention.
Shown in figure：1- import gate valves, 2- water injecting pumps, 3- outlets gate valve, 4- ball-and-seats, 5- water knockout drums, 6- pressure gauges, 7-
Water filling arterial control gate valve, 8- flowmeters, 9- the second water filling arterial control gate valves, 10- come Water gate valve, 11- oil pressure gate valves, 12-
Test plug, 13- pressed-on gate valves, 14- production gate valves, 15- emptying plugs, 16- emptying gate valves, 17- control gate valves, 18- casings
Gate valve, 19- pressure-raising gate valves, 20- cesspools, 21- water knockout drums purging gate valve.
Specific embodiment
A kind of process of produced-water reinjection main line alternative expression snaking of the present invention, comprises the following steps：A, construction is collected
The length of pipeline that needs, pipeline internal diameter, pipeline volume, pipeline scaling situation, operation pressure, operational discharge capacity；B, according to above-mentioned receipts
Data decimation water-tank lorry, Hydraulic vehicle, hot car washing, the pressure windmill collected；C, the pressure in pipeline is all discharged；D, pressure is passed through
Windmill all purges out the water in pipeline, and water is all discharged into cesspool；E, 40 DEG C of in-line injection is preset
Liquid, and preset liquid in-line reacts 30 minutes；F, the preset liquid complete liquidation in pipeline is gone out with 40 DEG C of clear water, and
Preset liquid and clear water are all discharged into cesspool；G, in-line injects 55 DEG C of I grade of cleaning solution, and reacts one hour；
H, and then again I grade of cleaning solution complete liquidation in pipeline is gone out with 55 DEG C of clear water, and by I grade of cleaning solution and clearly
Water is all discharged into cesspool；I, in-line injects 70 DEG C of II grade of cleaning solution, and reacts one hour；J, it is rear with 70 DEG C
Clear water goes out II grade of cleaning solution complete liquidation in pipeline, and II grade of cleaning solution and clear water are all discharged into cesspool；
K, step G to J is repeated according to pipeline scaling situation；L, in-line is blown into a steel ball more smaller than caliber after completing step K,
And the pressure changing in pipeline is observed, if occurring the situation that pressure steeply rises in pipeline, step G to J is repeated, if pipe
Do not occur the situation that pressure steeply rises in line, then continue next step；M, with discharge capacity it is finally 30m3/ h displacement fluids rush
Wash pipeline 50 minutes.
The above method uses the common instrument in construction site（Water-tank lorry, Hydraulic vehicle, hot car washing and related pressure windmill etc.
Deng）.At the scene, actual conditions are often the fouling that fouling is combined type, therefore single descaling agent is taken to be extremely difficult to ideal
Effect, since fouling is a kind of chemical combination sediment of densification, tube wall conjugation is high, and time-consuming for the modes such as mechanical snaking, to pipe
The damage of wall is big, is unfavorable for extending the service life of pipeline.Therefore, cleaning solution is divided into two-stage, the purpose of I grade of cleaning solution is that cleaning is attached
It in carbonate scales such as the calcium carbonate of dirty sample outer layer of tube wall, the purpose of II grade of cleaning solution is that cleaning is attached to outside the dirty sample of tube wall
The sulfate scales such as the barium sulfate of layer, progressive alternate mode of classifying gradually are removed the dirt finished on tube wall, and are repeated more
Secondary, simultaneously because not chemically reacted between two-stage cleaning solution, stability is good.
The collection of the pipeline scaling situation comprises the following steps：（1）According to the extraction water salinity and water of block entirety
Type, and the fouling account of the history of pipeline is used for reference, tentatively judge scaling type；（2）It is 5% dilute hydrochloric acid to select volume fraction respectively again,
The barium chloride solution that mass fraction is 1% silver nitrate solution and mass fraction is 1% determines dirty type.
In order to improve scale removal effect, preferred embodiment is the preset liquid for the water-soluble of Wax removing agent and demulsifier
Liquid, I grade of cleaning solution are the aqueous solution of hydrochloric acid and corrosion inhibiter, and II grade of cleaning solution is edta solution, institute
Displacement fluid is stated as scale remover aqueous solution.
For rinsing well for pipeline, preferred embodiment is that the clear water in the step J and H is according to 25m3/h
Amount run 10-15 minutes.
Invention is further described in detail with reference to the accompanying drawings and examples.
As shown in Figure 1, technological process：Water injecting pump 2 has import gate valve 1 and outlet gate valve 3, controls the disengaging of sewage, single
Stream valve 4 ensures that waste liquid does not enter water injecting pump 2, and there are two main lines, i.e. water filling main line and reflux main line, water filling in the outlet of water knockout drum 5
Main line is made of water filling arterial control gate valve 7, the second water filling arterial control gate valve 9 and flowmeter 8, is noted sewage and is passed through main line
Reach and come Water gate valve 10, oil pressure gate valve 11, test plug 12, pressed-on gate valve 13, production gate valve 14, emptying plug 15, emptying lock
Valve 16, control gate valve 17, the wellhead of water injection well for covering sluice valve 18, and the main line that flows back is then to reach cesspool by pressure-raising gate valve 19
20。
Work progress：
First, Construction in Preparatory Stage.
（1）Construction parameter
Construction parameter includes following several：1st, construction water filling main line length and caliber calculate the volume of fouling pipeline；2、
Check the fouling condition of pipeline.According to the extraction water salinity and water type of block entirety, and use for reference the fouling history feelings of oil pipeline
Condition, tentatively judges scaling type, selects a certain amount of volume fraction respectively as 5% dilute hydrochloric acid, and mass fraction is 1% silver nitrate solution
And the barium chloride solution that mass fraction is 1%, determine dirt type.3rd, according to the region landform of pipe installation, day-to-day operation pressure feelings
Condition calculates operation pressure and discharge capacity.4th, water injection technology flow is grasped, is switched in case carrying out flow.
（2）Site operation equipment selects.
The water of Reasonable Parameters is chosen according to situations such as the volume of pipeline, the thickness of fouling and type, operation pressure and discharge capacity
Tank car, Hydraulic vehicle, hot car washing and related pressure windmill, operation pressure does not exceed 7MPa, therefore 400 generally for scene
The Hydraulic vehicle of type and the hot car washing of routine and pressure windmill can be met the requirements, it is important to note that being related to tank car contains cleaning
Liquid, tank car will carry out preservative treatment in advance.
（3）The preparation of snaking medium.
According to the volume of water filling main line, the thickness of fouling and type, determine preset liquid, I grade of cleaning solution, II grade of cleaning solution with
And the concentration and volume of displacement fluid.
Secondly, the site operation stage.
The site operation stage should carry out related personnel, vehicle allocation and scene be responsible for etc. reach particular cases under into
Row, main step are as follows：
（1）Stop water injecting pump 2, close import gate valve 1 and outlet gate valve 3, open Dalmatia gate valve 19, close wellhead of water injection well life
Gate valve 14 is produced, pressure release is carried out, the pressure in pipeline is all discharged；
（2）It opens water filling arterial control gate valve 7, control gate valve 9, come Water gate valve 10, control gate valve 17, set sluice valve 18,
Oil pressure gate valve 11, test plug 12, pressed-on gate valve 13 are closed, pressure windmill connection plug 15 starts blowing, the water in pipeline is blown
To cesspool 20, until reach rational scope to pressure, the pressure in water filling pump house and the magneto-electric flow in pressure windmill,
Until middle pressure windmill 0.5MPa or so, pressure gauge 6 and flowmeter 8 are 0.
（3）Substantial amounts of sump oil is usually present on the tube wall of water filling main line, it is therefore necessary to be carried out first using preset liquid
Processing prevents sump oil from influencing scale removal effect.Mixed preset liquid is warmed to 40 DEG C or so using hot car washing, opens control lock
Valve 9 comes Water gate valve 10, emptying gate valve 16, control gate valve 17, set sluice valve 18, connects hot car washing, passes through flowmeter 8 and hot wash
Discharge capacity in vehicle judges whether pipeline is full of, and stops hot car washing, after reacting 30 minutes,
（4）Control gate valve 7 and pressure-raising gate valve 19 are opened again, are opened hot car washing, are pumped into a certain amount of mutually synthermal clear water
Preset liquid in flow is driven to cesspool 20, and according to 10m3The amount of/h is run 10-15 minutes, it is ensured that the sump oil in pipeline
It can obtain complete liquidation.
（5）（）1. mixed I grade of cleaning solution is warmed to 55 DEG C or so using hot car washing, control gate valve 9, water are opened
Gate valve 10, emptying gate valve 16, control gate valve 17, set sluice valve 18, connect hot car washing, pass through the row in flowmeter 8 and hot car washing
Amount judges whether pipeline is full of, and stops hot car washing, reacts or so hour, the connector for pressing windmill is connected to water knockout drum 5
Water knockout drum purges gate valve 21, and I grade of cleaning solution in flow is replaced back to the tank car of former hot car washing, closes water knockout drum purging gate valve
21, control gate valve 7 and pressure-raising gate valve 19 are opened, hot car washing is opened, is pumped into a certain amount of mutually synthermal clear water by I in flow
Grade cleaning solution is driven to cesspool 20, and according to 25m3The amount of/h is run 10-15 minutes, it is ensured that dirty sample table on water filling main line tube wall
The carbonate dirt in face is sufficiently washed away.
（6）II grade of cleaning solution is warmed to 70 DEG C or so with hot car washing, control gate valve 9 is opened, comes Water gate valve 10, emptying
Gate valve 16, control gate valve 17, set sluice valve 18, hot car washing is connected, pipeline is judged by the discharge capacity in flowmeter 8 and hot car washing
Whether it is full of, stops hot car washing, react or so hour, the water knockout drum that the connector for pressing windmill is connected to water knockout drum 5 purges
II grade of cleaning solution in flow is replaced back the tank car of former hot car washing by gate valve 21, is closed water knockout drum purging gate valve 21, is opened control
Gate valve 7 and pressure-raising gate valve 19 open hot car washing, are pumped into a certain amount of mutually synthermal clear water and drive II grade of cleaning solution in flow
It moves to cesspool 20, and according to 25m3The amount of/h is run 10-15 minutes, it is ensured that the sulfate on dirty sample surface on water filling main line tube wall
Class dirt is sufficiently washed away.
So repeatedly, until the dirty sample on tube wall cleans out.From the point of view of the practice at scene, waterflood-transmission line is in portion
Dividing oil field, general cycle 3-4 times can achieve the goal up to 0.5-2cm.
（7）The logical ball stage
Logical ball is the important means for examining scaling effect, and one steel ball more smaller than caliber is purged gate valve from water knockout drum
21 are put into, and open control gate valve 9, carry out Water gate valve 10, the water injection well plug for being vented 16 top of gate valve are laid down, from water knockout drum 5
Logical ball is purged to water injection well, pressure gauge 8 is observed, sees the situation of change of pressure, run into the situation that pressure steeply rises, it should be immediately
Stop purging, after steel ball is purged, continue construction and repeat the above steps（5）、（6）If steel ball can pass through, step is carried out
（8）.
（8）Liquid waste processing
Hot car washing is connected, the waste liquid after construction is replaced into cesspool 20, further filtration treatment realizes useless
Effective processing of liquid.
（9）Displacement fluid antiscale
Hot car washing is connected, according to above-mentioned technological process, displacement fluid is pumped into flow, while as scouring media, by remnants
Dirty sample carry to cesspool 20, the discharge capacity 30m of process3/ h is run 50 minutes or so.
Finally, flow Restoration stage
Recover normal water injection technology flow, open water injecting pump 2, coordinate the addition of the daily scale preventative of website, observe pressure
Situation of change, and make a record.
Above-described embodiment has the following advantages that：1st, the resource and existing technique for taking full advantage of base's work unit are set
It applies, it is workable；2nd, entire work progress, to the corrosion-free effect of pipeline；3rd, operation pressure is for 7MPa or so, safety coefficient
Height, no hidden danger；4th, for sulfate and the existing situation of a variety of mixtures of carbonate, by the way of alternation response, it is not required to
Will mechanical scraper etc equipment, pipeline is reprocessed, does not deposit failure and the problem of pipeline scratches, the time of cleaning is shorter,
It is more efficient；5th, snaking medium is divided into three phases, and prepad fluid cleans up sump oil remaining in pipeline, and displacement fluid uses scale preventative
Solution plays protective effect, and guarantee is provided for the effect of snaking；6th, Trunk Line treated waste liquid is in closed stream always
Journey, and dirt is precipitated as waste liquid enters cesspool, safety and environmental protection.
Claims (3)
1. a kind of process of produced-water reinjection main line alternative expression snaking, which is characterized in that comprise the following steps：
A, the length of pipeline needed of constructing, pipeline internal diameter, pipeline volume, pipeline scaling situation, operation pressure, construction row are collected
Amount；
B, according to the above-mentioned data decimation water-tank lorry being collected into, Hydraulic vehicle, hot car washing, pressure windmill；
C, the pressure in pipeline is all discharged；
D, by the way that windmill is pressed all to purge out the water in pipeline, and water is all discharged into cesspool；
E, in-line injects 40 DEG C of preset liquid, and preset liquid in-line reacts 30 minutes；
F, the preset liquid complete liquidation in pipeline is gone out with 40 DEG C of clear water, and preset liquid and clear water is all discharged into sewage
In pond；
G, in-line injects 55 DEG C of I grade of cleaning solution, and reacts one hour；
H, and then again I grade of cleaning solution complete liquidation in pipeline is gone out with 55 DEG C of clear water, and I grade of cleaning solution and clear water is equal
All discharge into cesspool；
I, in-line injects 70 DEG C of II grade of cleaning solution, and reacts one hour；
J, II grade of cleaning solution complete liquidation in pipeline is gone out with 70 DEG C of clear water afterwards, and II grade of cleaning solution and clear water is complete
Portion is discharged into cesspool；
K, step G to J is repeated according to pipeline scaling situation；
L, in-line is blown into a steel ball more smaller than caliber after completing step K, and observes the pressure changing in pipeline,
If occurring the situation that pressure steeply rises in pipeline, step G to J is repeated, if not occurring what pressure steeply rose in pipeline
Situation then continues next step；
M, with discharge capacity it is finally 30m3/ h displacement fluids clean-up line 50 minutes；
The preset liquid is Wax removing agent and the aqueous solution of demulsifier；
I grade of cleaning solution is hydrochloric acid and the aqueous solution of corrosion inhibiter；
II grade of cleaning solution is edta solution；
The displacement fluid is scale preventative aqueous solution.
2. the process of a kind of produced-water reinjection main line alternative expression snaking according to claim 1, which is characterized in that described
The collection of pipeline scaling situation comprises the following steps：
（1）According to the extraction water salinity and water type of block entirety, and the fouling account of the history of pipeline is used for reference, tentatively judge fouling
Type；
（2）It is 5% dilute hydrochloric acid to select volume fraction respectively again, and mass fraction is 1% silver nitrate solution and mass fraction is 1%
Barium chloride solution determines dirty type.
3. the process of a kind of produced-water reinjection main line alternative expression snaking according to claim 2, which is characterized in that described
Clear water in step H and J is according to 25m3The amount of/h is run 10-15 minutes.
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| CN110485975A (en) * | 2019-07-29 | 2019-11-22 | 西南石油大学 | A kind of horizontal well acidizing large scale acidizing wormhole simulator and experimental method |
| CN111236900B (en) * | 2020-01-08 | 2021-11-05 | 西南石油大学 | Wellhead backflow system and method for oil field water injection well |
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| GB9920970D0 (en) * | 1999-09-06 | 1999-11-10 | Astec Dev Ltd | Casing/pipeline cleaning tool |
| CN101525986B (en) * | 2009-04-20 | 2012-03-07 | 中国石油天然气股份有限公司 | Method for removing sulfate radical from injected water in oil field for anti-scaling |
| CN101671552B (en) * | 2009-09-28 | 2012-05-16 | 大庆油田有限责任公司 | Silicate scale clearing agent for ternary combination flooding extraction well |
| US9353609B2 (en) * | 2010-05-04 | 2016-05-31 | Nw24 Holdings, Llc | Method and composition for remedial treatment of parafin, asphaltenes, scale and deposits in oil and gas infrastructure and subterranean formations |
| CN101864575B (en) * | 2010-06-27 | 2012-02-29 | 金宏 | Special cleaning agent for stainless steel equipment and use method thereof |
| CN102519301A (en) * | 2011-12-09 | 2012-06-27 | 贵州开磷（集团）有限责任公司 | Method for washing scales formed on tube of graphite heat exchanger |
| CN103820150A (en) * | 2014-03-14 | 2014-05-28 | 西安石油大学 | Barium sulfate and strontium sulfate descaling agent and preparation method thereof |
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