CN104632152A - Injection increase and pressure reduction system for water injection wells of ultralow permeability oilfield and method thereof - Google Patents
Injection increase and pressure reduction system for water injection wells of ultralow permeability oilfield and method thereof Download PDFInfo
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- CN104632152A CN104632152A CN201410769794.8A CN201410769794A CN104632152A CN 104632152 A CN104632152 A CN 104632152A CN 201410769794 A CN201410769794 A CN 201410769794A CN 104632152 A CN104632152 A CN 104632152A
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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
- 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
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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
- 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
Abstract
The invention belongs to the field of oilfield water flooding, and particularly relates to an injection increase and pressure reduction system for water injection wells of an ultralow permeability oilfield and a method of the injection increase and pressure reduction system. A centrifugal pressurization water injection pump is used for pressurizing incoming water of a water injection system and increasing water injection pressure; after pressurization, the injection allocation requirement of the water injection wells can be met, and the problem that because the injection pressure of part of wells is high, water can not be injected can be solved. Meanwhile, an agent addition device is used for adding an injection increase and pressure reduction agent and making the agent enter the stratum so as to increase stratum permeability, reduce the injection pressure of the water injection wells and achieve pressure reduction. By means of the system and the method of the system, the problem of high pressure under-injection of an ultralow permeability reservoir of the Changqing Oilfield is effectively solved. According to the method, after the injection pressure of the water injection wells is reduced, the injection increase and pressure reduction equipment can be hoisted to other well sites, so that the cost is lowered, and the operating efficiency of the equipment is improved.
Description
Technical field
The invention belongs to water flooding field, be specifically related to a kind of ultra-low penetration water injection well in oil fields augmented injection depressurizing system and method thereof, is a kind of novel water injection well in oil fields augmented injection voltage reduction method.
Background technology
After exploitation is dropped in oil field, along with the growth of recovery time, the energy of oil reservoir own will constantly be consumed, cause formation pressure constantly to decline, underground crude oil is degassed in a large number, and viscosity increases, oil well output greatly reduces, and even stop-spraying can stop production, causes underground to remain a large amount of dead oil and can not adopt out.In order to the underground of causing after making up crude oil extraction is in debt, keep or improve formation pressure, realizing oil field stable high yield, and obtaining higher recovery ratio, must carry out water filling to oil field, water filling is the effective means of supplementary stratum energy, guarantee oil field long term stable production.
But for some extra-low-permeability reservoir, affect by reservoir properties, the water injection pressure rate of climb is fast, and injection pressure is high, Partial Block water injection well note does not enter, notes inadequate water, brings very large impact to oil field long term stable production.In recent years, the exploitation in ultra-low penetration oil field has more and more caused the concern of people.Develop ultra-low penetration oil field and have very important meaning to China Petroleum sustainable and stable development from now on.Extra-low-permeability reservoir reservoir properties is poor, and complex pore structure, degree of porosity are low, and pore throat radius is little, capillary pressure is high, and matrix permeability is low, and clay mineral content is high, reservoir sensitivity particularly water-sensitive is serious, and water-blocking effect is given prominence to, in drilling completion and development process, very easily cause formation damage.Along with ultra-low penetration waterflooding oil field enters high water cut rate, water injection well water absorbing capacity is deteriorated, and water injection pressure raises, and part well is shorted or stopped note, and stratum energy can not get supplementing, and waterflooding development effect is subject to serious impact.
For this problem, some oil fields take the well stimulation of the individual well such as acidifying, pressure break, the means such as partial Pressure equipment pressure-raising augmented injection carry out under-injected well improvement, although achieve certain effect, but still there is the problems such as individual well well stimulation period of validity is short, partial Pressure weak effect.
Summary of the invention
The object of the invention is to solve affects by reservoir properties, and ultra-low penetration oil-field flooding pressure is high, note does not enter water problem.
For this reason, the invention provides a kind of ultra-low penetration water injection well in oil fields augmented injection depressurizing system, comprise chemicals dosing plant and be arranged on the water supercharging device that water-injection station comes on water pipeline, described water supercharging device comprises the water injecting pump being arranged on water-injection station and coming on water pipeline, this water injecting pump is driven by motor, passes into shaft bottom after water injecting pump port of export connecting line; Described chemicals dosing plant comprises stirred tank, and stirred tank bottom is connected with diaphragm metering pump by pipeline, passes into shaft bottom after the port of export connecting line of diaphragm metering pump.
Described water injecting pump is centrifugal blower-pump.
In described water injecting pump port of export connecting line, strainer is installed.
In the port of export connecting line of described diaphragm metering pump, ball-and-seat is installed.
Be provided with high-pressure stop valve in the middle part of the port of export connecting line of described diaphragm metering pump, high-pressure stop valve front end is provided with reflux pipeline, and this reflux pipeline other end is communicated to stirred tank.
This ultra-low penetration water injection well in oil fields augmented injection depressurizing system integral installation, in skid body, skid body is provided with pipeline supporting rack.
As an augmented injection voltage reduction method for above-mentioned ultra-low penetration water injection well in oil fields augmented injection depressurizing system, comprise as lower part:
Supercharging: the water of water-injection station is by water injecting pump, and water injecting pump does work to the water of water-injection station under motor drives, and makes water pressure to be incremented to specification requirement step by step;
Dosing: increasing injection medicament is joined in stirred tank and stirs, the medicament after stirring enters metering diaphragm pump intake by stirred tank lower end pipeline, and it is consistent that diaphragm metering pump carries out being pressurized to water injecting pump outlet increasing injection insecticide pressure;
Close note: the increasing injection medicament of the water from water injecting pump port of export connecting line and the port of export connecting line from diaphragm metering pump carries out conjunction note in shaft bottom, common injection high pressure under-injected well, completes the augmented injection step-down of ultra-low penetration water injection well in oil fields.
Beneficial effect of the present invention: this ultra-low penetration water injection well in oil fields augmented injection depressurizing system provided by the invention, integral device is function-differentiated, functions is clearly demarcated, integral hoisting migration can be realized, be convenient to the use in batches in different well site, reduce expense cost, improve the operational efficiency of equipment; Use the augmented injection voltage reduction method of this ultra-low penetration water injection well in oil fields augmented injection depressurizing system, effectively can solve extra-low-permeability reservoir high pressure and short problem.
Below with reference to accompanying drawing, the present invention is described in further details.
Accompanying drawing explanation
Fig. 1 is present system schematic diagram.
Fig. 2 is chemicals dosing plant structural representation.
Description of reference numerals: 1, water-injection station; 2, water injecting pump; 3, motor; 4, stirred tank; 5, diaphragm metering pump; 6, strainer; 7, ball-and-seat; 8, water injection well; 9, pipeline supporting rack; 10, skid body; 11, high-pressure stop valve; 12, reflux pipeline.
Detailed description of the invention
For some extra-low-permeability reservoir, affect by reservoir properties, the water injection pressure rate of climb is fast, injection pressure is high, Partial Block water injection well note does not enter, notes inadequate water, bring very large impact to oil field long term stable production, for this reason, the present invention designs a kind of ultra-low penetration water injection well in oil fields augmented injection depressurizing system and method thereof.
Embodiment 1:
Present embodiments provide a kind of ultra-low penetration water injection well in oil fields augmented injection depressurizing system, as depicted in figs. 1 and 2, comprise chemicals dosing plant and be arranged on the water supercharging device that water-injection station 1 comes on water pipeline, described water supercharging device comprises the water injecting pump 2 being arranged on water-injection station 1 and coming on water pipeline, this water injecting pump 2 is driven by motor 3, passes into shaft bottom after water injecting pump 2 port of export connecting line; Described chemicals dosing plant comprises stirred tank 4, and stirred tank 4 bottom is connected with diaphragm metering pump 5 by pipeline, passes into shaft bottom after the port of export connecting line of diaphragm metering pump 5.
Carry out supercharging by water injecting pump 2 pairs of water-injection station 1 waters, improve water injection pressure, can meet the injection allocation requirement of water injection well 8 after supercharging, solve part well injection pressure high, note does not enter water problem; Carry out increasing injection adding of agent by chemicals dosing plant simultaneously, make medicament enter stratum, improve in-place permeability, reduce water injection well injection pressure, reach the object of step-down.
Embodiment 2:
On above-described embodiment basis, centrifugal blower-pump selected by water injecting pump 2, and centrifugal blower-pump can realize pressurized delivered easily, also can vertical transport, and discharge pressure is large, and transfer efficiency is high.
Be provided with strainer 6 in water injecting pump 2 port of export connecting line, strainer 6 can filter the water of water-injection station 1, ensures that the water at the bottom of Injection Well can not pollute bottom because of magazine that.
Be provided with ball-and-seat 7 in the port of export connecting line of diaphragm metering pump 5, ball-and-seat 7 can prevent medicament from refluxing, and ensures the accuracy of metering.
Further, in the middle part of the port of export connecting line of diaphragm metering pump 5, be provided with high-pressure stop valve 11, high-pressure stop valve 11 front end is provided with reflux pipeline 12, and this reflux pipeline 11 other end is communicated to stirred tank 4, and high-pressure stop valve 11 is positioned at ball-and-seat 7 front-end position.When the hypertonia of chemicals dosing plant Chinese medicine, high-pressure stop valve 11 ends, and medicament is back to stirred tank 4 with reflux pipeline 12, effectively prevent the waste of medicament, ensures the normal work of chemicals dosing plant pipeline.
Embodiment 3:
In the present embodiment, by the ultra-low penetration water injection well in oil fields augmented injection depressurizing system integral installation in above-described embodiment 1 and 2 in skid body 10, integral device is arranged in skid body 10, the convenient mobile of Whole Equipment can be realized, after water injection well injection pressure reduces, also by the lifting of augmented injection decompression device to other well site, expense cost can be reduced, improves the operational efficiency of equipment.
Skid body 10 is provided with pipeline supporting rack 9, pipeline supporting rack 9 is used for fixing pipeline, for the pipeline that some circuits are long, pipeline supporting rack 9 can be set up in position therebetween, highly beneficial to the stability of Whole Equipment like this, also there is effect very much for the equipment in integral skid mounting moving process is stable.
Embodiment 4:
The augmented injection voltage reduction method of the ultra-low penetration water injection well in oil fields augmented injection depressurizing system described in above-described embodiment 1 to 3, comprises as lower part:
Supercharging: the water of water-injection station 1 is by water injecting pump 2, and water injecting pump 2 does work to the water of water-injection station 1 under motor 3 drives, and makes water pressure to be incremented to specification requirement step by step;
Dosing: increasing injection medicament is joined in stirred tank 4 and stirs, the medicament after stirring enters diaphragm metering pump 5 entrance by stirred tank 4 lower end pipeline, and diaphragm metering pump 5 carries out being pressurized to water injecting pump 2 increasing injection insecticide pressure and exports unanimously;
Close note: the water from water injecting pump 2 port of export connecting line and the increasing injection medicament from the port of export connecting line of diaphragm metering pump 5 carry out conjunction note in shaft bottom, common injection high pressure under-injected well, complete the augmented injection step-down of ultra-low penetration water injection well in oil fields, make high pressure under-injected well reach not only augmented injection, but also the object of step-down.
This augmented injection voltage reduction method of the present embodiment, can play scale inhibition, snaking, viscosity reduction, prevent the effects such as swollen, improve stratum penetrating power, reduce injection pressure.Utilize this method of the present embodiment, test at Changqing oilfields, successfully solve long 8 oil reservoir of extra-low-permeability reservoir Liu Maoyuan 20 mouthfuls of high pressure and short problem.
More than exemplifying is only illustrate of the present invention, does not form the restriction to protection scope of the present invention, everyly all belongs within protection scope of the present invention with the same or analogous design of the present invention.
Claims (7)
1. a ultra-low penetration water injection well in oil fields augmented injection depressurizing system, it is characterized in that: comprise chemicals dosing plant and be arranged on the water supercharging device that water-injection station (1) comes on water pipeline, described water supercharging device comprises the water injecting pump (2) being arranged on water-injection station (1) and coming on water pipeline, this water injecting pump (2) is driven by motor (3), passes into shaft bottom after water injecting pump (2) port of export connecting line; Described chemicals dosing plant comprises stirred tank (4), and stirred tank (4) bottom is connected with diaphragm metering pump (5) by pipeline, passes into shaft bottom after the port of export connecting line of diaphragm metering pump (5).
2. ultra-low penetration water injection well in oil fields augmented injection depressurizing system as claimed in claim 1, is characterized in that: described water injecting pump (2) is centrifugal blower-pump.
3. ultra-low penetration water injection well in oil fields augmented injection depressurizing system as claimed in claim 1, is characterized in that: be provided with strainer (6) in described water injecting pump (2) port of export connecting line.
4. ultra-low penetration water injection well in oil fields augmented injection depressurizing system as claimed in claim 1, is characterized in that: be provided with ball-and-seat (7) in the port of export connecting line of described diaphragm metering pump (5).
5. ultra-low penetration water injection well in oil fields augmented injection depressurizing system as claimed in claim 4, it is characterized in that: in the middle part of the port of export connecting line of described diaphragm metering pump (5), be provided with high-pressure stop valve (11), high-pressure stop valve (11) front end is provided with reflux pipeline (12), and this reflux pipeline (12) other end is communicated to stirred tank (4).
6. the ultra-low penetration water injection well in oil fields augmented injection depressurizing system as described in claim 1-5, is characterized in that: this ultra-low penetration water injection well in oil fields augmented injection depressurizing system integral installation, in skid body (10), skid body (10) is provided with pipeline supporting rack (9).
7. an augmented injection voltage reduction method for ultra-low penetration water injection well in oil fields augmented injection depressurizing system as claimed in claim 6, is characterized in that, comprise as lower part:
Supercharging: the water of water-injection station (1) is by water injecting pump (2), and water injecting pump (2) does work to the water of water-injection station (1) under motor (3) drives, and makes water pressure to be incremented to specification requirement step by step;
Dosing: increasing injection medicament is joined in stirred tank (4) and stir, medicament after stirring enters diaphragm metering pump (5) entrance by stirred tank (4) lower end pipeline, and it is consistent that diaphragm metering pump (5) carries out being pressurized to water injecting pump (2) outlet increasing injection insecticide pressure;
Close note: the water from water injecting pump (2) port of export connecting line and the increasing injection medicament from the port of export connecting line of diaphragm metering pump (5) carry out conjunction note in shaft bottom, common injection high pressure under-injected well, completes the augmented injection step-down of ultra-low penetration water injection well in oil fields.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410769794.8A CN104632152B (en) | 2014-12-15 | 2014-12-15 | A kind of ultra-low penetration water injection well in oil fields augmented injection depressurizing system and its method |
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| CN201410769794.8A CN104632152B (en) | 2014-12-15 | 2014-12-15 | A kind of ultra-low penetration water injection well in oil fields augmented injection depressurizing system and its method |
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Cited By (5)
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| CN106337674A (en) * | 2016-08-30 | 2017-01-18 | 中国石油大学(北京) | Method for increasing daily output of tight oil of single well |
| CN108104782A (en) * | 2018-01-10 | 2018-06-01 | 中国石油天然气股份有限公司 | A kind of long-acting augmented injection acidification technique of water injection well |
| CN108661613A (en) * | 2018-05-17 | 2018-10-16 | 大港油田集团有限责任公司 | A kind of augmented injection method of waterflooding reservoir |
| CN109736795A (en) * | 2019-01-25 | 2019-05-10 | 中国石油天然气股份有限公司 | A method of judging that reservoir properties change |
| CN112576227A (en) * | 2020-11-26 | 2021-03-30 | 中国石油天然气股份有限公司 | Long-acting augmented injection method for water injection well of ultra-low permeability reservoir |
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| CN112576227A (en) * | 2020-11-26 | 2021-03-30 | 中国石油天然气股份有限公司 | Long-acting augmented injection method for water injection well of ultra-low permeability reservoir |
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