CN110188374B - Underground pressure simulation method for coiled tubing under condition of gas in well - Google Patents
Underground pressure simulation method for coiled tubing under condition of gas in well Download PDFInfo
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- CN110188374B CN110188374B CN201910289894.3A CN201910289894A CN110188374B CN 110188374 B CN110188374 B CN 110188374B CN 201910289894 A CN201910289894 A CN 201910289894A CN 110188374 B CN110188374 B CN 110188374B
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Abstract
The invention discloses a method for simulating the underground pressure of a coiled tubing under the condition of gas in a well, which comprises the following steps: s1: calculating the volume V of mud flowing into a shaft by a pump in The method comprises the steps of carrying out a first treatment on the surface of the S2: calculating the volume V of the flowing mud out The method comprises the steps of carrying out a first treatment on the surface of the S3: calculating the total volume V' of mud in a shaft; s4: calculating the expansion or contraction length of each section of slurry respectively, and balancing the pressure of each section of slurry; s5: calculating the hydrostatic column pressure P of the oil pipe and the sleeve Oil-removing device And P Still sleeve ；S6：P Cover ＝P 0 －P 0 ＇，P Well ＝P n +P n 'S'; wherein P is Cover Is a sleeve pressure, P 0 At the top gas pressure, P 0 ' Top mud pressure, P Well Is the bottom hole pressure, P n At the lowest end gas pressure, P n ' bottom mud pressure; s7: adding circulating pressure to the oil pressure and the casing pressure; s8: the oil pipe and the sleeve are self-balanced, and the steps are circulated. The method is beneficial to improving the simulation degree of the simulation system on the operation parameters of the continuous oil pipe.
Description
Technical Field
The invention relates to the field of underground pressure measurement and calculation of a coiled tubing, in particular to an underground pressure simulation method of the coiled tubing under the condition of gas in a well.
Background
In order to enhance the proficiency of operators who just participate in oilfield working, an actual construction environment is usually simulated truly by adopting a simulation training technology, the proficiency of the operators is improved by completing the operation content in a virtual environment, and meanwhile, the safety is high, and the loss caused by errors in field operation is avoided.
Therefore, the reduction degree of the simulation system to the real environment influences the simulation training quality, and when parameter changes are involved, the accurate measuring and calculating method is beneficial to improving the accuracy of model establishment.
Disclosure of Invention
In order to solve the problems, the invention provides a method for simulating the downhole pressure of a coiled tubing under the condition of gas in a well, which comprises the following steps:
s1: calculating the volume V of mud flowing into a shaft by a pump in ；
S2: calculating the volume V of the flowing mud out ；
S3: calculating the total volume V' of mud in a shaft;
s4: calculating the expansion or contraction length of each section of slurry respectively, and balancing the pressure of each section of slurry;
s5: calculating the hydrostatic column pressure P of the oil pipe and the sleeve Oil-removing device And P Still sleeve ；
S6：P Cover ＝P 0 －P 0 ＇，P Well ＝P n +P n 'S'; wherein P is Cover Is a sleeve pressure, P 0 At the top gas pressure, P 0 ' Top mud pressure, P Well Is the bottom hole pressure, P n At the lowest end gas pressure, P n ' bottom mud pressure;
s7: adding circulating pressure to the oil pressure and the casing pressure;
s8: the oil pipe and the sleeve are self-balanced, and the steps are circulated.
Further, the volume of the effluent slurry V out The calculation mode is that
Wherein S is the flow area, Δp is the front-back pressure difference, ρ is the medium density, the formula applies to the medium being liquid, if gas is multiplied by the flow resistance coefficient C d . The total mud volume V' =the volume of the mud flowing into the well bore V in Effluent mud volume V out + wellbore volume V.
The invention has the beneficial effects that: the underground pressure simulation method of the coiled tubing under the condition of gas in the well is beneficial to improving the simulation degree of a simulation system on the operation parameters of the coiled tubing.
Drawings
FIG. 1 is a flow chart of a method for measuring and calculating the downhole pressure of a coiled tubing under the condition of gas in a well;
FIG. 2 is a schematic diagram of the pressure in the tubing when there is gas in the well;
FIG. 3 is a schematic representation of the pressure in the tubing when there are multiple sections of gas in the well.
Detailed Description
In order to make the technical solution of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1, a method for simulating the downhole pressure of a coiled tubing under the condition of gas in a well comprises the following steps:
s1: calculating the volume V of mud flowing into a shaft by a pump in ；
S2: calculating the volume V of the flowing mud out ；
S3: calculating the total volume V' of mud in a shaft;
s4: calculating the expansion or contraction length of each section of slurry respectively, and balancing the pressure of each section of slurry;
s5: calculating the hydrostatic column pressure P of the oil pipe and the sleeve Oil-removing device And P Still sleeve ；
S6：P Cover ＝P 0 －P 0 ＇，P Well ＝P n +P n 'S'; wherein P is Cover Is a sleeve pressure, P 0 At the top gas pressure, P 0 ' Top mud pressure, P Well Is the bottom hole pressure, P n At the lowest end gas pressure, P n ' bottom mud pressure;
s7: adding circulating pressure to the oil pressure and the casing pressure;
s8: the oil pipe and the sleeve are self-balanced, and the steps are circulated.
P Oil-removing device P g h; ρ—density of liquid in oil pipe; g- -gravitational acceleration; h, the depth of liquid in the oil pipe;
P still sleeve P g h; ρ -the density of the liquid in the cannula; g- -gravitational acceleration; h-depth of liquid in the cannula.
As shown in fig. 2, the tubing pressure is also known as riser pressure, i.e., the standing pressure, which is created by the fluid column when there is gas in the well, but is subject to pressure fluctuations by the gas in the well. In the absence of flow in the well: pump pressure = stand pressure, bottom hole pressure = stand pressure + riser static pressure, bottom hole pressure = gas static pressure + gas below static pressure, casing pressure = gas static pressure-gas above static pressure. During the period of closing and opening the pump, if the length of the gas in the well is long enough, the pressure change during the pump holding is mainly borne by the gas in the pipeline, the length of the gas section is gradually shortened, and the sleeve pressure and the vertical pressure are slowly increased.
When there are multiple sections of gas in the well, each section of gas is expanded or compressed simultaneously, as shown in figure 3. The amount of flow change Δv, Δv is known to be formed by co-expansion of multiple gas segments, i.e., Δv= Σ (V i -V i '). The liquid column height change amount Δl, Δl is formed by co-expansion of multiple gas sections, that is, Δl= Σ (L i -L′ i ). According to the gaseous equation pv=c, (p+Δp) × (l+Δl) =p×l, it is deduced that:
Since the height of the liquid column between the gas sections is unchanged, the following relationship is maintained after the gas sections are expanded:
that is, the pressure change value Δp after each stage of gas expansion is equal.
Solving the higher-order equation
To obtain ΔP, and substituting ΔP into +.>
The expansion value of each gas can be obtained.
Thus, the effluent volume V out The calculation mode is that
Wherein S is the flow area, Δp is the front-back pressureThe difference, ρ, is the medium density, the formula applies to the medium being a liquid, if a gas is multiplied by the flow resistance coefficient C d . The total mud volume V' =the volume of the mud flowing into the well bore V in Effluent mud volume V out + wellbore volume V.
The foregoing disclosure is illustrative of the present invention and is not to be construed as limiting the scope of the invention, which is defined by the appended claims.
Claims (3)
1. The underground pressure simulation method for the coiled tubing under the condition of gas in the well is characterized by comprising the following steps of:
s1: calculating the volume V of mud flowing into a shaft by a pump in ；
S2: calculating the volume V of the flowing mud out ；
S3: calculating the total volume V' of mud in a shaft;
s4: calculating the expansion or contraction length of each section of slurry respectively, and balancing the pressure of each section of slurry; when there are multiple sections of gas in the well, each section of gas will expand or compress simultaneously. The flow rate change amount Δv is known, and Δv is formed by co-expansion of a plurality of stages of gases, that is, Δv= Σ (V i -V i '). The liquid column height change amount DeltaL is formed by the joint expansion of multiple sections of gases, namely DeltaL= Σ (L) i -L' i ). According to the gaseous equation pv=c, (p+Δp) × (l+Δl) =p×l, it is deduced that:
Since the height of the liquid column between the gas sections is unchanged, the following relationship is maintained after the gas sections are expanded:
that is, the pressure change value Δp after each stage of gas expansion is equal
Solving the higher-order equation
To obtain DeltaP, and substituting DeltaP into +.>
The expansion value of each section of gas can be obtained;
s5: calculating the hydrostatic column pressure P of the oil pipe and the sleeve Oil-removing device And P Still sleeve ；
S6：P Cover ＝P 0 －P 0 ＇，P Well ＝P n －P n 'S'; wherein P is Cover Is a sleeve pressure, P 0 At the top gas pressure, P 0 ' Top mud pressure, P Well Is the bottom hole pressure, P n At the lowest end gas pressure, P n ' bottom mud pressure;
s7: adding circulating pressure to the oil pressure and the casing pressure;
s8: the oil pipe and the sleeve are self-balanced, and the steps are circulated.
2. A method of simulating the downhole pressure of a coiled tubing in the presence of gas in a well according to claim 1, wherein the volume V of the effluent slurry out The outflow amount per unit time is calculated by
Wherein S is the flow area, Δp is the front-back pressure difference, ρ is the medium density, the formula applies to the medium being liquid, if gas is multiplied by the flow resistance coefficient C d 。
3. A method of simulating the downhole pressure of a coiled tubing under gas conditions in a well according to claim 1, wherein the total mud volume V' = the volume V of the flowing mud into the well bore in Effluent mud volume V out + wellbore volume V.
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
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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 |
| CN104504604B (en) * | 2014-12-12 | 2018-06-12 | 中国地质大学（武汉） | A kind of method of qualitative Wellbore of Gas Wells hydrops |
| CN106481319B (en) * | 2016-10-20 | 2019-10-11 | 中国石油化工股份有限公司 | Gas-lift well drain simulation test device and test 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 |
| CN109242364B (en) * | 2018-11-06 | 2021-07-30 | 中国海洋石油集团有限公司 | High-temperature high-pressure gas well simulation shaft volume replacement productivity evaluation method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
Non-Patent Citations (2)
| Title |
|---|
| 井筒内泥浆性能变化对井筒压力计算的影响;郭晓乐 等;《油气田地面工程》(第11期);1-8 * |
| 深水井控的七组分多相流动模型;孙宝江 等;《石油学报》(第06期);1-3 * |
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