CN105863560A - Oil-well steam thermal washing and chemical agent composite paraffin removal system and method - Google Patents
Oil-well steam thermal washing and chemical agent composite paraffin removal system and method Download PDFInfo
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- CN105863560A CN105863560A CN201610391960.4A CN201610391960A CN105863560A CN 105863560 A CN105863560 A CN 105863560A CN 201610391960 A CN201610391960 A CN 201610391960A CN 105863560 A CN105863560 A CN 105863560A
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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
- E21B37/00—Methods or apparatus for cleaning boreholes or wells
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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
- E21B37/00—Methods or apparatus for cleaning boreholes or wells
- E21B37/06—Methods or apparatus for cleaning boreholes or wells using chemical means for preventing, limiting or eliminating the deposition of paraffins or like substances
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- Chemical Kinetics & Catalysis (AREA)
- Lubricants (AREA)
- Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
Abstract
The invention relates to the technical field of oil-well paraffin removal in the oilfield exploitation process, in particular to an oil-well steam thermal washing and chemical agent composite paraffin removal system and method. An oil-well steam thermal washing paraffin removal method and an oil-well chemical agent paraffin removal method are organically combined to form the novel composite paraffin removal method, and by means of optimization on the technological process, the oil-well paraffin removal method which is free of well killing, capable of shortening or eliminating the oil-well recovery phase, free of pollution to an oil-well stratum and low in paraffin removal cost is provided.
Description
Technical field
The present invention relates to paraffin removal from oil well technical field in oil extraction process, particularly to a kind of oil well steam heat
Wash and be combined wax removal system and compound dewaxing method with chemical agent.
Background technology
Along with oil field Persisting exploitation, formation pressure constantly declines, and well yield is gradually lowered, control and remove of well paraffin
The difficulty of work continues to increase, and traditional Paraffin Removal mode can not meet the normal Production requirement of current oil well.
The oil well that oil field is commonly used is clear, anti-wax technique predominantly organic tool wax removal technology, heating power Paraffin Removal technology etc..Thermal washing
As conventional wax removal mode, the heat effect of flushing fluid can be obtained well in the well section of more than 300m
Play, but poor in the well section heats of below 300m, by various restrictions, even if improving flushing fluid temperature
With extend the thermal washing time, do not reach highly desirable wax removal effect, accordingly, it would be desirable to take multiple wax removal technique yet
The measure of combination reaches the purpose of thorough wax removal.
Summary of the invention
For solving technical problem present in above-mentioned prior art, the invention provides a kind of oil well steam thermal washing
Being combined wax removal system and dewaxing method with chemical agent, this system and method solves oil well or the viscous crude yielded poorly
A wax removal viscosity reduction difficult problem for oil well, wax deposition capable of washing is very serious, oil-line plugging reach more than 60% oil well, no
Affect the crude oil production of oil well, will not polluted reservoir, safety in production can be accomplished, the thermal efficiency is high, saves combustion
Oil, reduces and pollutes, to overcome the deficiency of conventional oil well steam hot washing process.
Technical scheme is as follows:
A kind of oil well steam thermal washing is combined wax removal system, including steam generator system and chemistry with chemical agent
Medicine system, described steam generator system includes water injecting pump, water tank, valve group, steam oven and connecting tube
Line is sequentially connected with composition, and described chemistry medicine system includes grug feeding jar and plunger metering dosing pump and connects pipeline
It is sequentially connected with composition, described steam oven end and described plunger metering dosing pump end by pipeline and supporting control
Valve processed connects with oil well oil jacket ring.
A kind of oil well steam thermal washing is combined dewaxing method with chemical agent, and softening water is heated to 70 DEG C-80 DEG C
Time, with plunger metering dosing pump, chemical agent is added to the water with 5% concentration, and is directly added into oil well with current
Oil sets annular space, administration timing of drug 2 hours, carry out steam heat after completing and wash, along with high-temperature steam is noted continuously
Entering, temperature gradually rises, and inwall wax deposition and tube wall viscous crude the most gradually melt, and gets rid of with production fluid
Well head.
Described chemical agent is the product prepared by following method: by the octadecyl acrylate of 8-10 weight portion,
The methacrylic acid docosyl ester of 18-23 weight portion, the styrene of 10-13 weight portion and 9-10 weight portion
Maleic anhydride mix homogeneously after 120-125 DEG C react 4-4.5 hour, prepare A agent；In another container,
By 3-ethyltoluene and the fatty alcohol-polyoxyethylene ether AEO-3 mixing of 5-8 weight portion of 42-44 weight portion,
At 60-65 DEG C, stirring reaction 2-2.5 hour, prepares B agent；By A agent and the B agent mixing of above-mentioned preparation,
After 80-85 DEG C of constant temperature 1-1.5 hour, stop heating, allow product stablize in reaction vessel 1.5-2 hour
Obtain.
The washed journey of described steam heat is as follows:
1) thermal washing starts, and enters well temperature and is 85-95 DEG C, discharge capacity 1.5 side, and prewashing 1 hour, oil well is normal
Produce；
2) enter well temperature and bring up to 100 DEG C one 110 DEG C, discharge capacity 2 side, work 1 hour, at this moment oil well can go out
Existing first paragraph discharge opeing, the wax of oil pipe wall hanging gradually dissolves, and discharges with production fluid；
3) entering well temperature to adjust to 115-120 DEG C, discharge capacity 2-2.5 side, work 2 hours, oil well there will be
Second segment discharge opeing, i.e. oil-water mixture, the wax dissolved in oil pipe during this period of time will be discharged in a large number；
4) well temperature stabilization is entered at 120 DEG C, discharge capacity 2-2.5 side, work 2 hours, the 3rd section of discharge opeing, i.e.
In sleeve pipe, the oil of deposition, wax and steam condensate (SC) mixed liquor are discharged；
5) enter well temperature to adjust to 125-130 DEG C, discharge capacity 3 side, consolidate 2 hours, at this moment oil well the 4th section
Discharge opeing, i.e. steam condensate (SC) eject the most counter, thoroughly clean dry by oil pipe, oil well pump and oil jacket space
Only.
In the present invention, chemical agent used can stop formation and the precipitation of macromole wax chain in having addition crude oil,
Stop crude oil wall built-up, thus reduce the freezing point of crude oil, reduce the performance of crude oil flow resistance in pipeline.
Steam thermal washing is by the way of secondary heat conduction, and softening water, with diesel oil as fuel, is heated to high temperature by steaming plant
Steam, steam enters oil sets annular space by infusion, and the steam entering annular space discharges heat to oil jacket, along with
High-temperature steam is continuously injected into, and relevant temperature gradually rises, relevant inwall wax deposition and tube wall viscous crude from top to bottom by
Gradually melting, and get rid of well head with production fluid, in pipe, crude oil flow resistance reduces, thus ensures that oil well is normally given birth to
Produce.
The present invention has the beneficial effects that paraffin removal from oil well process is progressively heated so safe and reliable, do not have due to
Temperature rise is too fast and the phenomenon of holddown.The discharge capacity of hot washing device, temperature adjustable, vapor (steam) temperature is up to 200 DEG C；
Steam adds chemical agent and is combined well-flushing, and temperature is high, and entry well fluid is few, not pollutes oil reservoir, for thin oil well
Preventing wax card, conventional Heavy Oil well reduces pumping unit load excellent；Using distilled water well-flushing, down-hole string is not
The problem that there is calcium ions and magnesium ions fouling.This pumping and washing process is not only washed thoroughly, also extends hot washing period,
It is the wax removal of a kind of worth promotion, viscosity reduction well-flushing mode, it is possible to overcome conventional hot water's well-flushing water many, temperature
Low, easily cause formation contaminant, oil well drain time is long, the shortcoming that oil production efficiency is low.
Accompanying drawing explanation
Fig. 1 steam thermal washing and chemical agent are combined wax removal technique schematic flow sheet.
Detailed description of the invention
Chemical agent used in the present invention is the Paraffin Control described in ZL200910088254.2 patent documentation
Agent.
As a example by Xinglongtai oil recovery factory, Liaohe Oil Field low-lying area 22-13 well: combine Fig. 1 and the present invention is made the most in detail
Illustrate:
This well belongs to high wax containing well, and oil-line plugging reaches 70%, washes front oil pressure 0.3Mpa, casing pressure 8.2MPa, electric current
51/55.First the outlet line of steam generator system, chemistry medicine system is connected with oil well casing, root
According to operational datas such as oil well paraffin content, dewaxing point, moisture content, Liquid output, oil outlet temperatures, determine chemical drugs
Agent dose is 5%, vapor (steam) temperature is transferred to 75 DEG C add chemical agents, medicament from oil sets annular space through screen casing
Enter oil pipe and be recycled to ground, administration timing of drug 2 hours, after dosing, carry out successively thermal washing pit shaft,
Fever sensation of the face washes pipeline pressure testing, pressure test pressure 15MPa, keeps tightly not leaking.Thermal washing starts, and steam enters well temperature and is
90 DEG C, discharge capacity 1.5 side, prewashing 1 hour, oil well normally produces；Enter well temperature and bring up to 110 DEG C, discharge capacity
2 sides, work 1 hour, and at this moment oil well there will be first paragraph discharge opeing, and the wax of oil pipe wall hanging gradually dissolves, with product
Go out liquid to discharge；Entering well temperature to adjust to 120 DEG C, discharge capacity 2.5 side, work 2 hours, oil well there will be second
Section discharge opeing, i.e. oil-water mixture, the wax dissolved in oil pipe during this period of time will be discharged in a large number；Enter well temperature steady
It is scheduled on 120 DEG C, discharge capacity 2 side, work 2 hours, oil, wax and the steaming of deposition in the 3rd section of discharge opeing, i.e. sleeve pipe
Vapour condensed water mixed liquor is discharged；Enter well temperature to adjust to 130 DEG C, discharge capacity 3 side, consolidate 2 hours, at this moment oil
Well the 4th section of discharge opeing, i.e. steam condensate (SC) eject the most counter, by thorough to oil pipe, oil well pump and oil jacket space
The end, cleans up.
Start to operate in strict accordance with four step fluid-discharge therapies during thermal washing, thermal washing temperature to be controlled, just started well-flushing
Shi Wendu can not be too high, and when temperature is too high, wax melts and the most thoroughly forms block flowing with well liquid, when poly-
When collecting more, will be stuck.Therefore just having started in thermal washing construction will with low discharge capacity, low temperature (with reference to liquid measure, no
Less than oil temperature) mode runs, and the mode of the discharge capacity that the most progressively heats up, improves is carried out, and temperature imported and exported by Zhongdao
Degree discharge capacity is consistent, and sampling at any time in washing well process, the change of close observation well head returning fluid, in washing well process
Every 30 minutes record related data, content includes: well-flushing inlet and outlet pressure, temperature, pipeline back pressure,
Inlet temperature, measures oil pumper upper and lower per hour before and after accurate recording returns liquid time, well-flushing well and during well-flushing
Row electric current.After paraffin removal from oil well technique terminates, wipe flow process pipeline, clear up and withdraw scene.
Using effect: hollow 22-13 well, wash rear yield steadily, electric current decline, wash front oil pressure 0.3Mpa, casing pressure
8.2MPa, electric current 51/55A, wash rear oil pressure 0.5MPa, casing pressure 6MPa, electric current 37/46A, cerul in oil pipe
Originally clean up, crude oil volume increase 50%, after the thermal washing time of this down-hole is 50 days, twice thermal washing time interval
It is 50 days, hot washing period is extended one times, reaches well washing effect.
Claims (4)
1. an oil well steam thermal washing is combined wax removal system with chemical agent, it is characterised in that include steam generator
System and chemistry medicine system, described steam generator system includes water injecting pump, water tank, valve group, steam
Stove and connection pipeline are sequentially connected with composition, and described chemistry medicine system includes grug feeding jar and plunger metering dosing pump
And connection pipeline is sequentially connected with composition, described steam oven end and described plunger metering dosing pump end by pipe
Line and supporting control valve connect with oil well oil jacket ring.
2. an oil well steam thermal washing is combined dewaxing method with chemical agent, it is characterised in that be heated to by softening water
When 70 DEG C-80 DEG C, with plunger metering dosing pump, chemical agent is added to the water with 5% concentration, and direct with current
Add oil well oil sets annular space, administration timing of drug 2 hours, carry out steam heat after completing and wash, along with high temperature steams
Vapour is continuously injected into, and temperature gradually rises, and inwall wax deposition and tube wall viscous crude the most gradually melt, and with product
Go out liquid and get rid of well head.
3. oil well steam thermal washing as claimed in claim 2 is combined dewaxing method with chemical agent, it is characterised in that
Described chemical agent is the product prepared by following method: by the octadecyl acrylate of 8-10 weight portion, 18-23
The methacrylic acid docosyl ester of weight portion, the styrene of 10-13 weight portion and the Malaysia of 9-10 weight portion
React 4-4.5 hour at 120-125 DEG C after anhydride mix homogeneously, prepare A agent；In another container, by 42-44
The 3-ethyltoluene of weight portion and the fatty alcohol-polyoxyethylene ether AEO-3 mixing of 5-8 weight portion, at 60-65 DEG C
Lower stirring reaction 2-2.5 hour, prepares B agent；By A agent and the B agent mixing of above-mentioned preparation, at 80-85 DEG C
Constant temperature stops heating after 1-1.5 hour, allow product stablize in reaction vessel 1.5-2 hour and get final product.
4. oil well steam thermal washing and chemical agent are combined dewaxing method as claimed in claim 2 or claim 3, and its feature exists
In, the washed journey of described steam heat is as follows:
1) thermal washing starts, and enters well temperature and is 85-95 DEG C, discharge capacity 1.5 side, and prewashing 1 hour, oil well is normal
Produce；
2) enter well temperature and bring up to 100 DEG C-110 DEG C, discharge capacity 2 side, work 1 hour, at this moment oil well can go out
Existing first paragraph discharge opeing, the wax of oil pipe wall hanging gradually dissolves, and discharges with production fluid；
3) entering well temperature to adjust to 115-120 DEG C, discharge capacity 2-2.5 side, work 2 hours, oil well there will be
Second segment discharge opeing, i.e. oil-water mixture, the wax dissolved in oil pipe during this period of time will be discharged in a large number；
4) well temperature stabilization is entered at 120 DEG C, discharge capacity 2-2.5 side, work 2 hours, the 3rd section of discharge opeing, i.e.
In sleeve pipe, the oil of deposition, wax and steam condensate (SC) mixed liquor are discharged；
5) enter well temperature to adjust to 125-130 DEG C, discharge capacity 3 side, consolidate 2 hours, at this moment oil well the 4th section
Discharge opeing, i.e. steam condensate (SC) eject the most counter, thoroughly clean dry by oil pipe, oil well pump and oil jacket space
Only.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610391960.4A CN105863560B (en) | 2016-05-25 | 2016-05-25 | Oil well steam hot wash and the compound wax removal system of chemical agent and compound dewaxing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610391960.4A CN105863560B (en) | 2016-05-25 | 2016-05-25 | Oil well steam hot wash and the compound wax removal system of chemical agent and compound dewaxing method |
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| Publication Number | Publication Date |
|---|---|
| CN105863560A true CN105863560A (en) | 2016-08-17 |
| CN105863560B CN105863560B (en) | 2018-09-25 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106522885A (en) * | 2016-12-21 | 2017-03-22 | 崔虹雯 | Wax removing method for oil well in oil extraction process |
| CN106593355A (en) * | 2017-01-16 | 2017-04-26 | 西南石油大学 | Paraffin-removing unblocking well-washing device for thickened oil well and method |
| CN108119097A (en) * | 2016-11-29 | 2018-06-05 | 中国石油天然气股份有限公司 | Pumping and washing process and well washing system |
| CN108590584A (en) * | 2018-03-30 | 2018-09-28 | 中国石油集团川庆钻探工程有限公司工程技术研究院 | A kind of online paraffin removal unit of self energy steam automatic heating washing oil wells and method |
| CN113006740A (en) * | 2021-04-27 | 2021-06-22 | 天津东拓油田技术服务有限公司 | Wellhead paraffin prevention mechanism and process |
| CN114059969A (en) * | 2022-01-14 | 2022-02-18 | 中国石油大学胜利学院 | Petroleum casing pipe charge device |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108119097A (en) * | 2016-11-29 | 2018-06-05 | 中国石油天然气股份有限公司 | Pumping and washing process and well washing system |
| CN106522885A (en) * | 2016-12-21 | 2017-03-22 | 崔虹雯 | Wax removing method for oil well in oil extraction process |
| CN106593355A (en) * | 2017-01-16 | 2017-04-26 | 西南石油大学 | Paraffin-removing unblocking well-washing device for thickened oil well and method |
| CN108590584A (en) * | 2018-03-30 | 2018-09-28 | 中国石油集团川庆钻探工程有限公司工程技术研究院 | A kind of online paraffin removal unit of self energy steam automatic heating washing oil wells and method |
| CN108590584B (en) * | 2018-03-30 | 2024-01-23 | 中国石油天然气集团有限公司 | Online paraffin removal device and method for self-energy steam automatic hot washing oil well |
| CN113006740A (en) * | 2021-04-27 | 2021-06-22 | 天津东拓油田技术服务有限公司 | Wellhead paraffin prevention mechanism and process |
| CN114059969A (en) * | 2022-01-14 | 2022-02-18 | 中国石油大学胜利学院 | Petroleum casing pipe charge device |
| CN114059969B (en) * | 2022-01-14 | 2022-03-18 | 中国石油大学胜利学院 | Petroleum casing pipe charge device |
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Effective date of registration: 20210428 Address after: 124221 Xinglong Industrial Park, Panjin Economic Development Zone, Panjin City, Liaoning Province Patentee after: Panjin Liaohe Oilfield Yulong Ruida Petroleum Technology Co.,Ltd. Address before: 124010 Industrial Development Zone, Xinglongtai District, Liaoning, Panjin Patentee before: LIAONING RUIDA PETROLEUM TECHNOLOGY Co.,Ltd. |