CN110188374A - There is coiled tubing down-hole pressure analogy method under gas condition in a kind of well - Google Patents
There is coiled tubing down-hole pressure analogy method under gas condition in a kind of well Download PDFInfo
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- CN110188374A CN110188374A CN201910289894.3A CN201910289894A CN110188374A CN 110188374 A CN110188374 A CN 110188374A CN 201910289894 A CN201910289894 A CN 201910289894A CN 110188374 A CN110188374 A CN 110188374A
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- pressure
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
Abstract
The invention discloses have coiled tubing down-hole pressure analogy method under gas condition in a kind of well, comprising the following steps: S1: calculating pump and flows into well mud volume Vin；S2: outflow mud volume V is calculatedout；S3: mud total volume V ' in pit shaft is calculated；S4: the length of each section of mud difference expansion or shrinkage is calculated, each section of mud pressure is balanced；S5: oil pipe and casing liquid column hydrostatic pressure P are calculatedOil is quietAnd PIt covers quiet；S6:PSet=P0- P0', PWell=Pn+Pn'；Wherein PSetFor casing pressure, P0For top gas pressure, P0' is top mud pressure, PWellFor bottom pressure, PnFor least significant end gas pressure, Pn' is bottom mud pressure；S7: plus circulation pressure on oil pressure and casing pressure；S8: oil pipe and casing self-balancing, the above steps are repeated.The method of the invention is conducive to improve simulation system to the fidelity of continuous oil pipe operation parameter.
Description
Technical field
The present invention relates to have continuous oil under gas condition in coiled tubing down-hole pressure measuring and calculating field more particularly to a kind of well
Pipe down-hole pressure analogy method.
Background technique
In order to enhance the proficiency for just participating in oil field operation personnel, simulation training technology real simulation is generallyd use
Practice of construction environment improves the proficiency of operator by the content that fulfils assignment under virtual environment, while having again very
High safety, loss caused by fault when avoiding execute-in-place.
Therefore, simulation system affects the reduction degree of true environment the quality of simulated training, is being related to Parameters variation
When, accurate measuring method is conducive to improve the accuracy of model foundation.
Summary of the invention
To solve the above-mentioned problems, the present invention proposes there is coiled tubing down-hole pressure simulation side under gas condition in a kind of well
Method, comprising the following steps:
S1: it calculates pump and flows into well mud volume Vin；
S2: outflow mud volume V is calculatedout；
S3: mud total volume V ' in pit shaft is calculated；
S4: the length of each section of mud difference expansion or shrinkage is calculated, each section of mud pressure is balanced；
S5: oil pipe and casing liquid column hydrostatic pressure P are calculatedOil is quietAnd PIt covers quiet；
S6:PSet=P0- P0', PWell=Pn+Pn'；Wherein PSetFor casing pressure, P0For top gas pressure, P0' is top mud
Pressure, PWellFor bottom pressure, PnFor least significant end gas pressure, Pn' is bottom mud pressure；
S7: plus circulation pressure on oil pressure and casing pressure；
S8: oil pipe and casing self-balancing, the above steps are repeated.
Further, the outflow mud volume VoutCalculation isWherein S is circulation area,
Δ p is front and back pressure difference, and ρ is Media density, this formula Applicable media is liquid, need to be multiplied by flow resistance coefficient C if gasd.Institute
State mud total volume V '=inflow well mud volume VinFlow out mud volume Vout+ wellbore volume V.
The beneficial effects of the present invention are: propose there is coiled tubing down-hole pressure simulation side under gas condition in a kind of well
Method is conducive to improve simulation system to the fidelity of continuous oil pipe operation parameter.
Detailed description of the invention
Fig. 1 is that have coiled tubing down-hole pressure measuring method flow chart under gas condition in well；
Fig. 2 is oil overpressure schematic diagram when having gas in well；
Fig. 3 is oil overpressure schematic diagram when having multistage gas in well.
Specific embodiment
It is with reference to the accompanying drawing and specific real in order to make those skilled in the art more fully understand technical solution of the present invention
Applying example, the present invention is described in further detail.
As shown in Figure 1, there is coiled tubing down-hole pressure analogy method under gas condition in a kind of well, comprising the following steps:
S1: it calculates pump and flows into well mud volume Vin；
S2: outflow mud volume V is calculatedout；
S3: mud total volume V ' in pit shaft is calculated；
S4: the length of each section of mud difference expansion or shrinkage is calculated, each section of mud pressure is balanced；
S5: oil pipe and casing liquid column hydrostatic pressure P are calculatedOil is quietAnd PIt covers quiet；
S6:PSet=P0- P0', PWell=Pn+Pn'；Wherein PSetFor casing pressure, P0For top gas pressure, P0' is top mud
Pressure, PWellFor bottom pressure, PnFor least significant end gas pressure, Pn' is bottom mud pressure；
S7: plus circulation pressure on oil pressure and casing pressure；
S8: oil pipe and casing self-balancing, the above steps are repeated.
POil is quiet=ρ g h；Fluid density in ρ-oil pipe；G-- acceleration of gravity；Liquid depth in h-oil pipe；
PIt covers quiet=ρ g h；Fluid density in ρ-casing；G-- acceleration of gravity；Liquid depth in h-casing.
As shown in Fig. 2, tubing pressure is also known as standpipe pressure, i.e., vertical to press, when having gas in well, pressure is generated by fluid column,
But pressure oscillation is born by gas in well.Without under mobility status in well: pump pressure=vertical pressure, bottom pressure=vertical pressure+standpipe are quiet
Pressure, bottom pressure=gas-static+gas lower section static pressure, casing pressure=gas-static-gas top static pressure.In the closing well turn on pump phase
Between, if gas length long enough in well, the variation of pressure is mainly undertaken by gas in pipelines when suppressing pump, the length of gas section
Degree can gradually shorten, and casing pressure and vertical pressure will be slow rising.
As shown in figure 3, each section of gas can be expanded or be compressed simultaneously when there is multistage gas in well.Known mass flow knots modification
Δ V, Δ V are expanded jointly by multistage gas, i.e. Δ V=∑ (Vi-Vi').Liquid-column height knots modification Δ L, Δ L is by multistage gas
Body expands jointly, i.e. Δ L=∑ (Li-L′i).Then there is (P+ Δ P) × (L+ Δ L)=P × L according to equation of gaseous state PV=C,
It releases:
With
Since liquid-column height does not change between each section of gas, each section of gas has been still maintained upon inflation with ShiShimonoseki
System:
That is, the change value of pressure Δ P after each section of gas expansion is equal.
Solve the equation of higher degreeΔ P can be obtained, then Δ P is substituted intoIt can find out
The swell value of every section of gas.
Therefore, the outflow mud volume VoutCalculation isWherein S is circulation area, Δ
P is front and back pressure difference, and ρ is Media density, this formula Applicable media is liquid, need to be multiplied by flow resistance coefficient C if gasd.It is described
Mud total volume V '=inflow well mud volume VinFlow out mud volume Vout+ wellbore volume V.
The above disclosure is only the preferred embodiments of the present invention, cannot limit the right model of the present invention with this certainly
It encloses, therefore equivalent changes made in accordance with the claims of the present invention, is still within the scope of the present invention.
Claims (3)
1. there is coiled tubing down-hole pressure analogy method under gas condition in a kind of well, which comprises the following steps:
S1: it calculates pump and flows into well mud volume Vin；
S2: outflow mud volume V is calculatedout；
S3: mud total volume V ' in pit shaft is calculated；
S4: the length of each section of mud difference expansion or shrinkage is calculated, each section of mud pressure is balanced；
S5: oil pipe and casing liquid column hydrostatic pressure P are calculatedOil is quietAnd PIt covers quiet；
S6:PSet=P0- P0', PWell=Pn- Pn'；Wherein PSetFor casing pressure, P0For top gas pressure, P0' is top mud pressure
Power, PWellFor bottom pressure, PnFor least significant end gas pressure, Pn' is bottom mud pressure；
S7: plus circulation pressure on oil pressure and casing pressure；
S8: oil pipe and casing self-balancing, the above steps are repeated.
2. having coiled tubing down-hole pressure analogy method, feature under gas condition in a kind of well according to claim 1
It is, the outflow mud volume VoutCalculation isWherein S is circulation area, and Δ p is front and back
Pressure difference, ρ are Media density, this formula Applicable media is liquid, need to be multiplied by flow resistance coefficient C if gasd。
3. having coiled tubing down-hole pressure analogy method, feature under gas condition in a kind of well according to claim 1
It is, the mud total volume V '=inflow well mud volume VinFlow out mud volume Vout+ wellbore volume V.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910289894.3A CN110188374B (en) | 2019-04-11 | 2019-04-11 | Underground pressure simulation method for coiled tubing under condition of gas in well |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910289894.3A CN110188374B (en) | 2019-04-11 | 2019-04-11 | Underground pressure simulation method for coiled tubing under condition of gas in well |
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| CN110188374A true CN110188374A (en) | 2019-08-30 |
| CN110188374B CN110188374B (en) | 2023-05-23 |
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Citations (6)
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| CN201330573Y (en) * | 2008-11-26 | 2009-10-21 | 西部钻探克拉玛依钻井工艺研究院 | Bottom-hole pressure precision control system of under balance drilling |
| CN104504604A (en) * | 2014-12-12 | 2015-04-08 | 中国地质大学（武汉） | Method for qualifying liquid loading of gas well |
| CN104790916A (en) * | 2015-04-24 | 2015-07-22 | 中国石油集团川庆钻探工程有限公司长庆井下技术作业公司 | Method for removing gas well accumulated liquid by means of oil jacket pressure balancing method |
| CN107060731A (en) * | 2017-07-04 | 2017-08-18 | 中国石油集团钻井工程技术研究院 | A kind of deepwater drilling casing setting depth modification method based on well kick surplus |
| CN109242364A (en) * | 2018-11-06 | 2019-01-18 | 中国海洋石油集团有限公司 | A kind of volume displaced evaluating production capacity method of gas well at HTHP simulation wellbore hole |
| CN110924906A (en) * | 2016-10-20 | 2020-03-27 | 中国石油化工股份有限公司 | Gas lift well liquid discharge simulation test device |
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2019
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| CN201330573Y (en) * | 2008-11-26 | 2009-10-21 | 西部钻探克拉玛依钻井工艺研究院 | Bottom-hole pressure precision control system of under balance drilling |
| CN104504604A (en) * | 2014-12-12 | 2015-04-08 | 中国地质大学（武汉） | Method for qualifying liquid loading of gas well |
| CN104790916A (en) * | 2015-04-24 | 2015-07-22 | 中国石油集团川庆钻探工程有限公司长庆井下技术作业公司 | Method for removing gas well accumulated liquid by means of oil jacket pressure balancing method |
| CN110924906A (en) * | 2016-10-20 | 2020-03-27 | 中国石油化工股份有限公司 | Gas lift well liquid discharge simulation test device |
| CN107060731A (en) * | 2017-07-04 | 2017-08-18 | 中国石油集团钻井工程技术研究院 | A kind of deepwater drilling casing setting depth modification method based on well kick surplus |
| CN109242364A (en) * | 2018-11-06 | 2019-01-18 | 中国海洋石油集团有限公司 | A kind of volume displaced evaluating production capacity method of gas well at HTHP simulation wellbore hole |
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| 孙宝江 等: "深水井控的七组分多相流动模型", 《石油学报》 * |
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