CN104453806A - Method for removing sandstone condensate gas reservoir water lock through nitrogen injection - Google Patents
Method for removing sandstone condensate gas reservoir water lock through nitrogen injection Download PDFInfo
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- CN104453806A CN104453806A CN201410595253.8A CN201410595253A CN104453806A CN 104453806 A CN104453806 A CN 104453806A CN 201410595253 A CN201410595253 A CN 201410595253A CN 104453806 A CN104453806 A CN 104453806A
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- nitrogen
- injection
- nitrogen injection
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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
- E21B43/166—Injecting a gaseous medium; Injecting a gaseous medium and a liquid medium
- E21B43/168—Injecting a gaseous medium
Abstract
The invention relates to a method for removing a sandstone condensate gas reservoir water lock through nitrogen injection. The method includes the steps of the nitrogen injection initial stage, the nitrogen injection breakthrough stage, the nitrogen injection diffusion stage and the closing-in stage, wherein at the nitrogen injection initial stage, flow in a shaft and a water crest of a near-shaft region are gradually compressed through the nitrogen and are displaced towards the periphery of a well, and the injected nitrogen tongues along the top of a reservoir stratum; at the nitrogen injection breakthrough stage, the nitrogen is ceaselessly injected, and after the difference value between the pressure at the bottom of the well and the pressure of the stratum during gas injection is larger than the pressure of the water lock, the nitrogen is injected to break through a water lock barrier; at the nitrogen injection diffusion stage, the nitrogen is ceaselessly injected, the water crest on the periphery of the well is dispersed to a farther place, and the gas-phase seepage capacity is improved; at the closing-in stage, the nitrogen injection stops, the water crest is further compressed to fall, and the gas-phase seepage capacity is further improved. By injecting the high-pressure nitrogen to displace the water of the near-shaft region, communication is achieved for natural gas at a far end, and the gas-phase seepage capacity is improved; meanwhile, through the high compressibility and expansibility of the nitrogen, the good emission assisting, displacing and gas lifting effects are achieved when energy is released, and finally the gas well yield is recovered and the condensate gas reservoir recovery efficiency is improved.
Description
Technical field
The present invention relates to a kind of recovery gas well deliverability, the nitrogen injection improving Recovery of Gas Condensate Reservoirs removes the method for sandstone gas condensate reservoir water lock.
Background technology
Sandstone gas condensate reservoir reservoir is easily subject to water blocking damage.In drilling well, completion, well workover and recovery process, all can occur that outside fluid is detained in reservoir, formation water invades containing situations such as spiracular slits, cause reservoir generation water to be locked.Water lock can cause near wellbore zone water saturation to increase, and increases the hollow billet resistance of gas-water interface in pore throat, thus causes gas phase filtrational resistance to increase, relative permeability reduces, cause gas well deliverability to decline, even stop-spraying, larger impact is caused on the exploitation of gas condensate reservoir.
The dewater method of lock of current sandstone gas condensate reservoir solution is more, as injected dry gas, acidifying, injects surfactant etc.Show through field trial, the mode effect of acidifying, injection surfactant is poor, and dry gas has multiple, as natural gas etc., inject the requirement of natural gas to wellhead assembly, ground flow, equipment investment, safety and environmental protection higher, and the mechanism that gas condensate reservoir nitrogen injection Xie Shui locks, injection rate, closed time, the isoparametric design of the mode that drives a well are still not clear, in specific implementation process, lack operability.The correlation technique content of the application has no report.
Summary of the invention
The object of the invention is to propose a kind of natural gas of linking up far-end, increase gas phase percolation ability; Have the good row of helping, displacement and gas lift, finally reach recovery gas well deliverability, the nitrogen injection improving Recovery of Gas Condensate Reservoirs object removes the method for sandstone gas condensate reservoir water lock.
The object of the present invention is achieved like this: a kind of nitrogen injection removes the method for sandstone gas condensate reservoir water lock, and it comprises the following steps:
(1) the nitrogen injection initial stage: nitrogen gradually reduces the water ridge of wellbore fluids and near wellbore zone, and to well week displacement, gas injection pressure rises gradually, and nitrogen injection is along the tonguing of reservoir top;
(2) nitrogen injection breaks through the phase: continue nitrogen injection, and after bottom pressure in gas injection and strata pressure difference are greater than water lock pressure, nitrogen injection breaks through water screen locking barrier;
(3) nitrogen injection diffusion period: continue nitrogen injection, injection pressure and injection rate are comparatively stable, all water ridges of well are dispersed to farther place, and gas phase percolation ability improves gradually;
(4) vexed well: stop nitrogen injection, well head pressure declines also gradually and strata pressure keeps relative equilibrium, and again divide different impact by nitrogen expansion and oil gas water, water ridge is further compressed tenesmus, and gas phase percolation ability improves further.
Owing to implementing technique scheme, the application, by injecting the water of high pressure nitrogen displacement near wellbore zone, links up the natural gas of far-end, increases gas phase percolation ability; Utilize nitrogen with excellent compressibility and dilatancy simultaneously, when fault offset, there is the good row of helping, displacement and gas lift, finally reach recovery gas well deliverability, improve Recovery of Gas Condensate Reservoirs.
Accompanying drawing illustrates: concrete structure of the present invention is provided by following drawings and Examples:
Fig. 1 is method each stage water ridge schematic diagram that nitrogen injection removes sandstone gas condensate reservoir water lock.
Detailed description of the invention:
The present invention by the restriction of following embodiment, can not determine concrete embodiment according to technical scheme of the present invention and actual conditions.
Embodiment: as shown in Figure 1, in an initial condition, after condensate gas well water breakthrough, the water body of intrusion forms water ridge in well week, causes near wellbore zone that water lock occurs, gas phase cannot seepage flow in pit shaft.The nitrogen injection of the application removes the method for sandstone gas condensate reservoir water lock, and it comprises the following steps:
(1) the nitrogen injection initial stage (in Fig. 1 injected gas compression I): nitrogen gradually reduces the water ridge of wellbore fluids and near wellbore zone, and to well week displacement, gas injection pressure rises gradually, by gas onlap function influence, and because density of nitrogen is lower than atmospheric density at the bottom of ground, therefore nitrogen injection is mainly along the tonguing of reservoir top;
(2) nitrogen injection breaks through the phase (in Fig. 1 injected gas compression II): after gas injection pressure rises to certain value (this value is determined by nitrogen injection rate V), after injection pressure reduction (gas injection bottom pressure-strata pressure) is greater than water lock pressure, nitrogen injection breaks through water screen locking barrier, well cylinder pressure declines suddenly, disperse well week water ridge to a certain extent, link up the natural gas of reservoir far-end, add gas phase percolation ability;
(3) nitrogen injection diffusion period (in Fig. 1 injected gas compression III): after gas injection breaks through, enter a comparatively stable gas injection section, injection pressure and injection rate are comparatively stable, well week water ridge dispersed to farther place, gas phase percolation ability improves gradually;
(4) the vexed well of gas injection (in Fig. 1 vexed well IV) is stopped: well head pressure declines also gradually and strata pressure keeps relative equilibrium, and again divide different impact by nitrogen expansion and oil gas water, water ridge is further compressed tenesmus, and gas phase percolation ability improves further.
In this application, nitrogen injection rate V is that a main note adopts parameter, and its value is calculated by following
:take cylinder as ideal model, in conjunction with water lock radius (numerical simulation is by dbase: Eclipse, software version number: Eclipse2010, developer: Schlumberger draws) obtained in laboratory experiment and numerical simulation, set up the design formulas of injected gas volume, Vf=π × R
2× L × φ × Sg, wherein Vf is the volume of nitrogen injection in underground, unit m
3; R is water lock pollution radius, unit m; L is perforation length, unit m; φ reservoir effecive porosity, unit %; Sg, gas saturation, unit %.Described perforation length refers to: perforation adopts cumulative equipment to enter well predetermined level to carry out blast perforate and allow down-hole formation inner fluid enter the activity of eyelet, and the interval of perforate is just perforated interval.
The nitrogen volume injecting underground and pit shaft is converted ground volume by utilization state equation, and design formulas is:
1. the nitrogen volume computing on stratum is injected: Vsc1=Vf × Tsc × Pf/(Psc × Tf), wherein Vsc1 is the volume of nitrogen on ground injecting stratum, unit m
3; Vf is the volume of nitrogen injection in underground, unit m
3; Tsc surface temperature, unit K; Pf strata pressure, units MPa; Psc surface air pressure, value 0.101MPa; Tf formation temperature, unit K;
2. the nitrogen volume computing of pit shaft is injected: Vsc2=Vw × Tsc × Pw/(Psc × Tw), wherein Vsc2 is the volume of nitrogen on ground injecting pit shaft, unit m
3; Vw is wellbore volume, unit m
3; Tsc surface temperature, unit K; Pw pit shaft average pressure, units MPa; Psc surface air pressure, value 0.101MPa; Tw formation temperature, unit K.
Final required nitrogen volume (under the state of ground) is V=Vsc1+Vsc2.
As shown in Figure 1, nitrogen injection enters after stratum forms continuous phase and gets final product opening well and making production, closing well (stewing well) can only make water ridge decline under the effect of gas expansion gentle water density difference, i.e. setting-out cone effect, therefore the setting of closed time is relevant with strata pressure, adopt the method for numerical simulation to simulate the stewing well time: 1, strata pressure all-the-time stable during stewing well, then stewing well drove a well after 10 days; 2, pressure presents downward trend, then stewing well drove a well after 5 days; 3, stewing well pressure rises, and drives a well after 3 days until pressure stability.
Drive a well working system: working system when 1. normally producing with reference to this well, considers bottom water coning and critical fluid-carrying capability, ensures lower than bottom water coning critical output but take liquid tolerance higher than critical; 2. adopt the noticeable degree be installed on Christmas tree in the process that drives a well, adjustment needle-valve makes the tolerance reaching setting, and needle-valve, by little and large, guarantees that tolerance is taken on liquid tolerance critical.
Above technical characteristic constitutes most preferred embodiment of the present invention, and it has stronger compliance and best implementation result, can increase and decrease inessential technical characteristic according to actual needs, meet the needs of different situations.
Claims (7)
1. nitrogen injection removes a method for sandstone gas condensate reservoir water lock, it is characterized in that: it comprises the following steps:
(1) the nitrogen injection initial stage: nitrogen gradually reduces the water ridge of wellbore fluids and near wellbore zone, and to well week displacement, gas injection pressure rises gradually, and nitrogen injection is along the tonguing of reservoir top;
(2) nitrogen injection breaks through the phase: continue nitrogen injection, and after bottom pressure in gas injection and strata pressure difference are greater than water lock pressure, nitrogen injection breaks through water screen locking barrier;
(3) nitrogen injection diffusion period: continue nitrogen injection, injection pressure and injection rate are comparatively stable, all water ridges of well are dispersed to farther place, and gas phase percolation ability improves gradually;
(4) vexed well: stop nitrogen injection, well head pressure declines also gradually and strata pressure keeps relative equilibrium, and again divide different impact by nitrogen expansion and oil gas water, water ridge is further compressed tenesmus, and gas phase percolation ability improves further.
2. nitrogen injection as claimed in claim 1 removes the method for sandstone gas condensate reservoir water lock, it is characterized in that: the nitrogen injection total amount in step (1) (2) (3) of claim 1 is designated as V, final required nitrogen volume is V=Vsc1+Vsc2, wherein Vsc1 is the volume of nitrogen on ground injecting stratum, and wherein Vsc2 is the volume of nitrogen on ground injecting pit shaft.
3. nitrogen injection as claimed in claim 2 removes the method for sandstone gas condensate reservoir water lock, it is characterized in that: the nitrogen volume computing injecting stratum: Vsc1=Vf × Tsc × Pf/(Psc × Tf), unit m
3; Vf is the volume of nitrogen injection in underground, unit m
3; Tsc surface temperature, unit K; Pf strata pressure, units MPa; Psc surface air pressure, value 0.101MPa; Tf formation temperature, unit K.
4. nitrogen injection as claimed in claim 2 removes the method for sandstone gas condensate reservoir water lock, it is characterized in that: the nitrogen volume computing injecting pit shaft: Vsc2=Vw × Tsc × Pw/(Psc × Tw), unit m
3; Vw is wellbore volume, unit m
3; Tsc surface temperature, unit K; Pw pit shaft average pressure, units MPa; Psc surface air pressure, value 0.101MPa; Tw formation temperature, unit K.
5. nitrogen injection as claimed in claim 1 removes the method for sandstone gas condensate reservoir water lock, it is characterized in that: strata pressure all-the-time stable during stewing well, then stewing well drove a well after 10 days.
6. nitrogen injection as claimed in claim 1 removes the method for sandstone gas condensate reservoir water lock, it is characterized in that: during stewing well, strata pressure presents downward trend, then stewing well drove a well after 5 days.
7. nitrogen injection as claimed in claim 1 removes the method for sandstone gas condensate reservoir water lock, it is characterized in that: strata pressure pressure increase during stewing well, drives a well after 3 days until pressure stability.
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| CN201410595253.8A CN104453806A (en) | 2014-10-30 | 2014-10-30 | Method for removing sandstone condensate gas reservoir water lock through nitrogen injection |
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| CN201410595253.8A CN104453806A (en) | 2014-10-30 | 2014-10-30 | Method for removing sandstone condensate gas reservoir water lock through nitrogen injection |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105298452A (en) * | 2015-10-26 | 2016-02-03 | 中国石油天然气股份有限公司 | Oil reservoir three-dimensional gas injection method and well pattern structure |
| CN105319329A (en) * | 2015-12-06 | 2016-02-10 | 西南石油大学 | Compact sandstone gas reservoir water-blocking damage and electrical heating water-blocking reliving simulation device and method |
| CN108643873A (en) * | 2018-05-09 | 2018-10-12 | 重庆科技学院 | One kind after well well workover of calming the anger for reproducing method |
| CN109826601A (en) * | 2019-02-27 | 2019-05-31 | 成都理工大学 | A kind of compact reservoir water lock release method |
| CN112499586A (en) * | 2020-12-02 | 2021-03-16 | 西南石油大学 | Method for realizing steam reforming hydrogen production by heating water-invaded gas reservoir stratum |
| CN117591777A (en) * | 2024-01-18 | 2024-02-23 | 成都英沃信科技有限公司 | Method for determining water saturation of well Zhou Linjie produced by water flooded gas well |
| CN117591777B (en) * | 2024-01-18 | 2024-04-30 | 成都英沃信科技有限公司 | Method for determining water saturation of water flooded gas well production well Zhou Linjie |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105298452A (en) * | 2015-10-26 | 2016-02-03 | 中国石油天然气股份有限公司 | Oil reservoir three-dimensional gas injection method and well pattern structure |
| CN105298452B (en) * | 2015-10-26 | 2018-05-04 | 中国石油天然气股份有限公司 | A kind of oil reservoir solid inflating method and well pattern structure |
| CN105319329A (en) * | 2015-12-06 | 2016-02-10 | 西南石油大学 | Compact sandstone gas reservoir water-blocking damage and electrical heating water-blocking reliving simulation device and method |
| CN105319329B (en) * | 2015-12-06 | 2017-04-05 | 西南石油大学 | WATER LOCKING DAMAGE OF TIGHT SAND GAS RESERVOIRS is damaged and electrical heating solution eliminating water locked mode intends apparatus and method |
| CN108643873A (en) * | 2018-05-09 | 2018-10-12 | 重庆科技学院 | One kind after well well workover of calming the anger for reproducing method |
| CN109826601A (en) * | 2019-02-27 | 2019-05-31 | 成都理工大学 | A kind of compact reservoir water lock release method |
| CN112499586A (en) * | 2020-12-02 | 2021-03-16 | 西南石油大学 | Method for realizing steam reforming hydrogen production by heating water-invaded gas reservoir stratum |
| CN112499586B (en) * | 2020-12-02 | 2021-11-23 | 西南石油大学 | Method for realizing steam reforming hydrogen production by heating water-invaded gas reservoir stratum |
| CN117591777A (en) * | 2024-01-18 | 2024-02-23 | 成都英沃信科技有限公司 | Method for determining water saturation of well Zhou Linjie produced by water flooded gas well |
| CN117591777B (en) * | 2024-01-18 | 2024-04-30 | 成都英沃信科技有限公司 | Method for determining water saturation of water flooded gas well production well Zhou Linjie |
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Application publication date: 20150325 |