CN109763782A - The round-robin method of water injection well well-flushing - Google Patents
The round-robin method of water injection well well-flushing Download PDFInfo
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- CN109763782A CN109763782A CN201811629408.XA CN201811629408A CN109763782A CN 109763782 A CN109763782 A CN 109763782A CN 201811629408 A CN201811629408 A CN 201811629408A CN 109763782 A CN109763782 A CN 109763782A
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Abstract
The present invention relates to a kind of round-robin methods of water injection well well-flushing.Mainly solve the problems, such as that existing traditional well-flushing mode well-flushing standard is single, well-flushing mode is lack of pertinence.It is characterized by: including following steps: (1), compared with former pumping and washing process, having carried out exhaustive division to water injection well well-flushing hole condition, well-flushing purpose；(2), optimize different well-flushing pressure, well-flushing discharge capacity, well-flushing liquid measure for different reason well-flushings；(3), determine whether pulling.The round-robin method of the water injection well well-flushing can carry out well-flushing to different injection well hole condition and well-flushing purpose application different parameters, guarantee that well-flushing has more specific aim, improve well-flushing quality.
Description
Technical field
The present invention relates to oil recovery development technique field, in particular to a kind of round-robin method of water injection well well-flushing.
Background technique
Water injection well water filling quality directly affects the development effectiveness of water controlled field, and water injection well well-flushing, which is used as, guarantees that water injection well is poured in
The safeguard of water plays an important role in daily maintenance and management, how to guarantee that well-flushing quality is to guarantee that water injection well is poured in
The key of water.For traditional well-flushing mode, first is that well-flushing standard is single, method is general, well-flushing mode is lack of pertinence,
In well-flushing construction, different injection well application same way parameter well-flushing is not adjusted accordingly different injection well hole condition, therefore right
Without preferable adaptability and lead to well-flushing low efficiency in different injection well hole condition；Second is that flushing fluid there are problems that shortcut " streaming " (see
Fig. 1), when the separate water injection well well-flushing of part tripping in compression packer, after upper packer well-flushing passage is opened, if on
Portion's water filling interval water nozzle is excessive, will cause flushing fluid and streams directly return ground, can not suppress pressure, lead to lower part interval packer
Well-flushing passage can not be opened, and well-flushing quality is influenced.
Summary of the invention
The technical problem to be solved by the present invention is to overcome tradition well-flushing mode well-flushing standard list present in background technique
One, the problem of well-flushing mode is lack of pertinence, and a kind of round-robin method of water injection well well-flushing is provided, the circulation of the water injection well well-flushing
Method can carry out well-flushing to different injection well hole condition and well-flushing purpose application different parameters, guarantee that well-flushing has more specific aim, improve
Well-flushing quality.
The present invention solves the problems, such as that it can reach by following technical solution: the round-robin method of the water injection well well-flushing, including
Following steps:
(1), compared with former pumping and washing process, exhaustive division has been carried out to water injection well well-flushing hole condition, well-flushing purpose；
(2), optimize different well-flushing pressure, well-flushing discharge capacity, well-flushing liquid measure for different reason well-flushings；
(3), determine whether pulling.
It is described that water injection well well-flushing hole condition, well-flushing purpose are classified as；
Hole condition classification: water injection well well-flushing is divided into well-flushing, conventional well-flushing, producing well, set before driving a well, test after brill control and is become
Well, sand output well, short time ﹥ 180 days, short the time≤180 days and measure before 9 class of well-flushing；
Well-flushing purpose: it is divided into clean water injection string as the main purpose and to clean based on borehole and water injection well near wellbore zone
Syllabus.
It is described to optimize different well-flushing pressure, well-flushing discharge capacity, well-flushing liquid measure method are as follows:
Well-flushing pressure: water injection well well-flushing pressure is determined according to well-flushing purpose, if well-flushing purpose is cleaning pit shaft, is controlled
Well-flushing pressure processed=stratum starting pressure (stratum starting pressure is pressure when water injection well starts water suction), so that stratum is not returned
It spits, sewage is reduced in the case where guaranteeing well-flushing quality and is generated；If well-flushing purpose is to remove near wellbore zone pollution, well-flushing is controlled
The stratum pressure < starts pressure, when realizing well-flushing stratum " micro- spray ", returns out near wellbore zone pollutant to ground in washing well process
Face.
Well-flushing discharge capacity: classifying according to above-mentioned different well's conditions, and big emptying gate is gradually opened in the case where guaranteeing well-flushing pressure,
Control well-flushing discharge capacity is 15 → 20 → 25 or 20 → 25m3/h。
Well-flushing liquid measure: according to above-mentioned different well's conditions, the classification of well-flushing purpose and water injection well well depth, well-flushing liquid measure setting cleaning 2-
6 times of wellbore volumes or more.
It is described to determine whether pulling method are as follows:
For the water injection well of applied compression formula packer, before shorting the time≤180 days and measure under two kinds of hole conditions of well-flushing
It needs to calculate comprehensive water nozzle size A, determines when A is less than 9.32mm, can directly carry out well-flushing；When A is greater than 9.32mm, Ying Xian
After throwing dead mouth or turning water nozzle down, then carry out well-flushing.
One, before theory analysis well-flushing pulling water nozzle necessity: be combined with the theoretical analysis of by site operation, obtain certain row
Under amount, when forming effective oil jacket pressure difference, according to brave " the sharp-tongued chock pressure difference formula of water nozzle " is appointed, show that compression packer well-flushing is logical
The comprehensive water nozzle size of the maximum that road is opened is 9.32mm.
When the excessive well-flushing of compression packer water injection well water nozzle, to guarantee that water filling interval packer well-washing channels at different levels are beaten
It opens, it is assumed that there are n sections of water filling intervals, each interval tap diameter sizes to be followed successively by d1, d2 from top to bottom for injection well pipe column ... ...
Dn-1, dn (mm) (no mouth calculates 10mm), pass through theory deduction:
Derive equation:
It determines when A is less than 9.32mm, can directly carry out well-flushing；When A is greater than 9.32mm, it should first throw dead mouth or turn water down
After mouth, then carry out well-flushing.
Two, it is small that 2 sports 9 such as cleaning pit shaft and cleaning stratum are divided in detail according to different injection well hole condition and well-flushing purpose
Class, for different well-flushings classify, determine corresponding well-flushing discharge capacity, liquid measure, pressure and whether pulling.Water injection well washing technology standard
The table of comparisons is shown in Table 1.
Table 1
The round-robin method of the water injection well well-flushing makes well-flushing arrange due to having carried out exhaustive division to different well's conditions and well-flushing purpose
More professional and specific aim is applied, convenient for judging whether well-flushing is qualified.This method needs first according to water injection well packer application
Type and well-flushing purpose carry out the judgement of pulling necessity before well-flushing, and the comprehensive water nozzle of the water injection well for having demand is made to be less than 9.32mm,
Flushing fluid " streaming " is avoided, ensure that the thorough cleaning of full well section.This pumping and washing process is for cleaning pit shaft and with removing nearly well
The different well-flushing purposes of two kinds of band pollution have carried out well-flushing pressure, discharge capacity and the detailed quantitative classification of liquid measure, therefore effectively control well-flushing
Liquid measure improves well-flushing quality and construction efficiency.
The present invention can have the following beneficial effects: the round-robin method of the water injection well well-flushing compared with above-mentioned background technique,
Water injection well well-flushing methods are improved, mainly different injection well hole condition and well-flushing purpose application different parameters are washed
Well guarantees that well-flushing has more specific aim, improves well-flushing quality.Well-flushing is carried out to 6 mouthfuls of water injection wells of different blocks using the pumping and washing process
Construction, technique success rate 100%.Average water injection pressure 13.9MPa, daily water-injection rate 16.7m before 6 mouthfuls of well well-flushings3, average after well-flushing
Pressure has dropped 0.4MPa, and daily water-injection rate rises 31.5m3.From this, the pumping and washing process can be effectively improved water filling shape
Condition.
Detailed description of the invention
Attached drawing 1 is water injection well well-flushing flushing fluid of the invention around flow diagram.
Specific embodiment:
The invention will be further described with reference to the accompanying drawing:
The round-robin method of the water injection well well-flushing, comprising the following steps:
1, compared with former pumping and washing process, exhaustive division has been carried out to water injection well well-flushing hole condition, well-flushing purpose；
Hole condition classification: water injection well well-flushing is divided into well-flushing, conventional well-flushing, producing well, set before driving a well, test after brill control and is become
Well, sand output well, short time ﹥ 180 days, short the time≤180 days and measure before 9 class of well-flushing；
Well-flushing purpose: water injection well well-flushing is classified to clean pit shaft and remove near wellbore zone and pollutes 2.
2, optimize different well-flushing pressure, well-flushing discharge capacity, well-flushing liquid measure for different reason well-flushings；
Well-flushing pressure: water injection well well-flushing pressure is determined according to well-flushing purpose, if well-flushing purpose is cleaning pit shaft, is controlled
Well-flushing pressure processed=stratum starting pressure (stratum starting pressure is pressure when water injection well starts water suction), so that stratum is not returned
It spits, sewage is reduced in the case where guaranteeing well-flushing quality and is generated；If well-flushing purpose is to remove near wellbore zone pollution, well-flushing is controlled
The stratum pressure < starts pressure, when realizing well-flushing stratum " micro- spray ", returns out near wellbore zone pollutant to ground in washing well process
Face.
Well-flushing discharge capacity: classifying according to above-mentioned different well's conditions, and big emptying gate is gradually opened in the case where guaranteeing well-flushing pressure,
Control well-flushing discharge capacity is 15 → 20 → 25 or 20 → 25m3/h。
Well-flushing liquid measure: according to above-mentioned different well's conditions, the classification of well-flushing purpose and water injection well well depth, well-flushing liquid measure setting cleaning 2-
6 times of wellbore volumes or more.
3, determine whether pulling
For the water injection well of applied compression formula packer, before shorting the time≤180 days and measure under two kinds of hole conditions of well-flushing
It needs to calculate comprehensive water nozzle size A, determines when A is less than 9.32mm, can directly carry out well-flushing；When A is greater than 9.32mm, can send out
Raw flushing fluid streams, as shown in Figure 1, to guarantee that flushing fluid is flowed according to ideal way, after should first throwing dead mouth or turning water nozzle down, then
Carry out well-flushing.
Well-flushing is carried out to 6 mouthfuls of water injection wells that the 7th oil recovery factory Tai Nan of Daqing oil field, platform start block using the pumping and washing process to apply
Work, technique success rate 100%.Water injection well well washing effect statistics is shown in Table 2.
Table 2
As can be seen from Table 2, average water injection pressure 13.9MPa, daily water-injection rate 16.7m before 6 mouthfuls of well well-flushings3, mean pressure after well-flushing
Power has dropped 0.4MPa, and daily water-injection rate rises 31.5m3.As it can be seen that the pumping and washing process can be effectively improved water filling situation in table.
Claims (4)
1. a kind of round-robin method of water injection well well-flushing, it is characterised in that: the following steps are included:
(1), compared with former pumping and washing process, exhaustive division has been carried out to water injection well well-flushing hole condition, well-flushing purpose；
(2), optimize different well-flushing pressure, well-flushing discharge capacity, well-flushing liquid measure for different reason well-flushings；
(3), determine whether pulling.
2. the round-robin method of water injection well well-flushing according to claim 1, it is characterised in that: to water filling in the step (1)
Well well-flushing hole condition, well-flushing purpose are classified as；
Hole condition classification: by water injection well well-flushing be divided into brill control after drive a well, test before well-flushing, routine well-flushing, producing well, casing deformation well,
Sand output well, short time ﹥ 180 days, short the time≤180 days and measure before 9 class of well-flushing；
Well-flushing purpose: it is divided into clean water injection string as the main purpose and to clean borehole and water injection well near wellbore zone as main syllabus
's.
3. the round-robin method of water injection well well-flushing according to claim 1, it is characterised in that: optimize not in the step (2)
With well-flushing pressure, well-flushing discharge capacity, well-flushing liquid measure method are as follows:
Well-flushing pressure: water injection well well-flushing pressure is determined according to well-flushing purpose, if well-flushing purpose is cleaning pit shaft, control is washed
Well pressure=stratum starts pressure, spits so that stratum is not returned, and sewage is reduced in the case where guaranteeing well-flushing quality and is generated；If well-flushing
Purpose is to remove near wellbore zone pollution, then controls the well-flushing stratum pressure < starting pressure and washing when realizing well-flushing stratum " micro- spray "
Near wellbore zone pollutant is returned out to ground during well；
Well-flushing discharge capacity: classifying according to above-mentioned different well's conditions, and big emptying gate, control are gradually opened in the case where guaranteeing well-flushing pressure
Well-flushing discharge capacity is 15 → 20 → 25 or 20 → 25m3/h；
Well-flushing liquid measure: according to above-mentioned different well's conditions, the classification of well-flushing purpose and water injection well well depth, the setting of well-flushing liquid measure cleans 2-6 times
Wellbore volume or more.
4. the round-robin method of water injection well well-flushing according to claim 1, it is characterised in that: in the step (3) determination be
No pulling method are as follows:
For the water injection well of applied compression formula packer, short the time≤180 days with needed under two kinds of hole conditions of well-flushing before measure
Comprehensive water nozzle size A is calculated, determines when A is less than 9.32mm, can directly carry out well-flushing；When A is greater than 9.32mm, should first throw dead
Mouth or after turning water nozzle down, then carry out well-flushing.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113062699A (en) * | 2021-03-31 | 2021-07-02 | 代建伟 | Process method for carrying out layered injection well flushing by utilizing nitrogen injection |
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| CN105156047A (en) * | 2015-06-18 | 2015-12-16 | 中国石油天然气股份有限公司 | Skid-mounted water injection well circulating well washing device and circulating well washing technique |
| CN107152265A (en) * | 2017-07-14 | 2017-09-12 | 西安石油大学 | The ultrasonic generation system of low permeability reservoir augmented injection underground low-frequency hydraulic pulse coupling waterpower |
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| CN113062699A (en) * | 2021-03-31 | 2021-07-02 | 代建伟 | Process method for carrying out layered injection well flushing by utilizing nitrogen injection |
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