CN109064350B - Analysis method of suspensible underground cyclone gas-liquid separation combined lifting system - Google Patents

Analysis method of suspensible underground cyclone gas-liquid separation combined lifting system Download PDF

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CN109064350B
CN109064350B CN201810944811.5A CN201810944811A CN109064350B CN 109064350 B CN109064350 B CN 109064350B CN 201810944811 A CN201810944811 A CN 201810944811A CN 109064350 B CN109064350 B CN 109064350B
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CN109064350A (en
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郑春峰
刘敏
杨万有
李昂
薛德栋
张凤辉
沈琼
任维娜
赵景辉
安程
苏作飞
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China National Offshore Oil Corp CNOOC
CNOOC Energy Technology and Services Ltd
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Abstract

The invention belongs to the technical field of oil field exploitation, and discloses a suspensible underground cyclone gas-liquid separation combined lifting system analysis method, which comprises the steps of calculating the flow and pressure of a gas path, the total flow of liquid and gas phases, the gas content and the pressure after separation of a cyclone gas-liquid separator by setting a split flow ratio; after the gas production oil pipe is judged to meet the liquid carrying requirement through iterative calculation, the gas output and the pressure of a gas circuit suction inlet of the liquid-gas ejector pump are calculated; iteratively calculating the flow and pressure of a liquid path at an outlet of the electric pump unit by setting characteristic parameters of the electric pump unit to obtain the power liquid pressure and the power liquid amount of the liquid-gas ejector pump; and (3) iteratively and optimally designing the technological parameters of the liquid-gas ejector pump, judging the operation interval of the liquid-gas ejector pump under the conditions of outlet pressure and flow until the design parameters are in the reasonable operation interval, and finally iteratively calculating the pressure loss of the oil pipe along the way to the wellhead until the oil pressure is greater than the flow back pressure, thus finishing the process. The method established by the invention can guide parameter design, production control and system coordination analysis of the underground cyclone gas-liquid separation process.

Description

Analysis method of suspensible underground cyclone gas-liquid separation combined lifting system
Technical Field
The invention relates to the technical field of oilfield exploitation, in particular to an analysis method of a suspensible underground cyclone gas-liquid separation combined lifting system.
Background
Offshore oil field high gas-liquid ratio oil well (gas content > 60%) faces the problems of low lifting efficiency of conventional electric pump well, gas lock when serious, and serious influence on normal production of oil well. At present, the common lifting method can treat the well condition with the gas content of 0-60 percent, and the following 3 types are mainly adopted: 1) the conventional gas-liquid separator is suitable for the well condition that the gas content at the pumping inlet is less than 30 percent; 2) the gas separation master can treat the well condition of gas content of 30-50% at the pumping inlet, and the separation efficiency is obviously reduced when the gas content is increased. 3) The gas processor compresses and dissolves gas in crude oil through underground pressurization, and is suitable for well conditions with oil content of more than 80%.
Various solutions are proposed for the situation that the gas content under the underground working condition is higher than 60 percent, such as: patent document CN 107420084 a proposes a suspensible real-time control downhole gas-liquid separation combined lifting system, which has the characteristics of simple operation and construction, large treatment liquid amount and the like, and can be widely applied to a high gas-liquid ratio oil well lifting process on the sea. Patent document CN 207017952U proposes a novel offshore adjustable underground gas-liquid separation lifting process pipe column, which has the characteristics of simple operation and construction, large liquid treatment amount and gas treatment amount, and the like, and can be widely applied to the liquid drainage and gas production lifting process of offshore liquid accumulation gas wells. However, the above two patents only show the structure of the process pipe column, and do not show the system coordination analysis method.
The coordinated analysis of the underground gas-liquid separate production system can not only effectively solve the efficient interval operation of each subsystem, but also realize the stable operation of a gas-liquid separator, an electric pump and a liquid discharge/exhaust system, is an essential technical link of the underground gas-liquid separate production process technology, and is necessary to establish a set of method capable of guiding the parameter design, the production control and the system analysis of the underground cyclone gas-liquid separation process. The application takes a process pipe column given in patent document CN 107420084A as a background, and establishes a set of system analysis method. Four parts of the underground rotational flow gas-liquid separator, the electric pump unit and the gas production pipe liquid carrying and ejecting discharging and producing system in the system are taken as an integral research object, and a system analysis method based on pressure, gas quantity and liquid quantity is provided, so that the design of underground gas-liquid separation process parameters and production control can be guided.
Disclosure of Invention
The invention provides a suspensible underground cyclone gas-liquid separation combined lifting system analysis method, which aims to solve the technical problems of uncoordinated production of subsystems, low system operation efficiency or failure of an underground gas-liquid separation production process when the system is serious, and the like.
In order to solve the technical problems, the invention is realized by the following technical scheme:
a suspended type underground cyclone gas-liquid separation combined lifting system analysis method comprises the following steps:
the method comprises the following steps: given target fluid production QilTarget gas production QigStatic pressure of reservoir Pi(ii) a Liquid content f for a given inlet of a cyclone gas-liquid separatorlGiven formation temperature Ti；
Step two: the lower depth of the electric pump unit is made to be HjLet the lower depth of the cyclone gas-liquid separator be hjWhere j represents the number of iterations, a positive integer starting from 1, H1For a given initial value of depth, h, below the electric pump unit1The initial value of the lower depth of the given cyclone gas-liquid separator is obtained; given wellhead back pressure Pc；
Step three: according to the target fluid production amount QilTarget product ofGas quantity QigStatic pressure of reservoir PiCalculating bottom hole flowing pressure Pwf；
According to the lower depth h of the cyclone gas-liquid separatorjBottom hole flowing pressure PwfAnd formation temperature TiCalculating the liquid phase flow Q at the inlet of the cyclone gas-liquid separatoril1Flow rate of gas phase Qig1Pressure P1And temperature T1；
Step four: the flow division ratio of the cyclone gas-liquid separator at any moment is set to be FkK represents the number of iterations and is a positive integer starting from 1, F1The initial value of the given split ratio is set;
according to the split ratio FkCalculating the gas path flow Q of the separated gas outlet of the cyclone gas-liquid separatorgGas path pressure Pg2And gas path temperature Tg2；
Step five: according to the gas path flow Q of the separated gas outlet of the cyclone gas-liquid separatorgGas path pressure Pg2And gas path temperature Tg2Calculating the gas path gas amount Q after passing through the gas path regulating deviceg3Gas path pressure Pg3And gas path temperature Tg3；
Step six: let the diameter of the gas production oil pipe be diI represents the number of iterations, a positive integer starting from 1, d1The diameter is a given initial value of the diameter of the gas production oil pipe;
according to the gas path gas quantity Q after passing through the gas path regulating and controlling deviceg3Gas path pressure Pg3And gas path temperature Tg3And diameter d of the production tubingiAnd calculating to obtain the critical liquid carrying flow q of the gas production oil pipec；
Step seven: judging whether the designed gas production oil pipe meets the liquid carrying requirement or not, wherein the judgment standard is as follows: when q isc>QgIf the gas production pipe does not meet the liquid carrying requirement, executing the step eight; when q isc<QgIf so, the gas production pipe meets the liquid carrying requirement, and the ninth step is executed;
step eight: diameter d of gas production oil pipei＝diD-delta d, further judging whether d is 1.05 in. ltoreq. di≤2.375in；
If yes, repeating the step six;
if not, the flow dividing ratio F of the cyclone gas-liquid separator is setk＝Fk+. DELTA F, then judge whether 0 < FkIf so, repeatedly executing the step four; if not, the lower depth H of the electric pump unit is controlledj＝Hj+. DELTA.H, lower depth of cyclone gas-liquid separatorj＝hjB, repeatedly executing the step two;
step nine: according to the gas path gas quantity Q after passing through the gas path adjusting deviceg3Gas path pressure Pg3And gas path temperature Tg3And calculating to obtain the gas flow Q of the gas path suction inlet of the liquid-gas ejector pumpg4Pressure P of suction inlet of gas pathg4Temperature T of suction inlet of gas circuitg4；
Step ten: according to the split ratio F of the cyclone gas-liquid separatorkCalculating the total flow Q of liquid and gas phases at the liquid outlet after separation by the cyclone gas-liquid separatorlGas content fg2And pressure Pl2；
Step eleven: according to the lower depth H of the electric pump unitjThe total flow Q of liquid and gas phases at the liquid outlet after the separation of the cyclone gas-liquid separatorlGas content fg2And pressure Pl2And calculating to obtain the flow Q of the liquid path at the inlet of the electric pump unitl3Pressure P of liquid pathl3Temperature T of the liquid pathl3；
Step twelve: setting rated discharge capacity and rated lift of electric pump unit to make operation frequency fmM represents the number of iterations and is a positive integer starting from 1, f1The initial value of the given running frequency is obtained;
according to the total flow Q of liquid and gas phases at the inlet of the electric pump unitl3Pressure P of liquid pathl3Temperature T of the liquid pathl3Calculating the liquid path flow Q of the outlet of the electric pump unitl4Pressure P of liquid pathl4Temperature T of the liquid pathl4；
Step thirteen: the high-pressure liquid in the liquid path passing through the electric pump unit is used as the power liquid of the liquid-gas ejector pump, and the power liquid amount is set to be Ql4The power hydraulic pressure is Pl4(ii) a Gas passage gas passing through the upper end of the gas production oil pipe is taken as gas passage suction of a liquid-gas injection pumpGas is produced at the inlet, and the gas quantity Q is produced according to the obtained gas circuit suction inlet of the liquid-gas ejector pumpg4Pressure P of suction inlet of gas pathg4Temperature T of suction inlet of gas circuitg4Calculating the parameters of the liquid-gas injection process based on the above conditions to obtain the outlet pressure P of the liquid-gas injection pump5；
Fourteen steps: according to the outlet pressure P of the liquid-gas ejector pump5And calculating to obtain wellhead pressure Pt；
Step fifteen: if P is judgedt-PcIf yes, executing step sixteen; if yes, executing seventeen;
sixthly, the steps are as follows: if Pt-PcIf more than 0 is not true, the running frequency f of the electric pump unit is enabledm＝fmPositive delta f, further judging whether f is less than or equal to 30Hzm≤60Hz；
If yes, repeating the step twelve;
if not, the flow dividing ratio F of the cyclone gas-liquid separator is setk＝Fk+. DELTA F, then judge whether 0 < FkIf so, repeatedly executing the step four; if not, the lower depth H of the electric pump unit is controlledj＝Hj+. DELTA.H, lower depth of cyclone gas-liquid separatorj＝hjB, repeatedly executing the step two;
seventeen steps: if Pt-PcIf > 0, the calculation ends.
Further, the flow dividing ratio of the cyclone gas-liquid separator at any moment in the fourth step is defined as:
Figure BDA0001769945920000041
in the formula (1), QlIs the total flow of liquid and gas phases of the liquid outlet after the separation of the cyclone gas-liquid separator, m3/d；QITotal flow of liquid and gas phases at the inlet of a cyclone gas-liquid separator, i.e. QI＝Qil1+Qig1，m3/d。
Further, the rotational flow gas-liquid in the fourth stepGas path flow Q of gas outlet after separation of separatorgCalculated using the following formula:
Qg＝QI[(1-fl)-(Fk-F)] (2)
in the formula (2), QITotal flow of liquid and gas phases at the inlet of a cyclone gas-liquid separator, i.e. QI＝Qil1+Qig1，m3/d；flThe liquid content of the inlet of the cyclone gas-liquid separator is percent; fkThe split ratio of the cyclone gas-liquid separator is dimensionless; f is the optimal split ratio of the cyclone gas-liquid separator and is dimensionless;
wherein, when the liquid outlet after the separation of the cyclone gas-liquid separator does not contain gas and the gas outlet does not contain liquid, F at the momentkDefined as the optimum split ratio, denoted by F.
Further, in the fourth step, the gas path pressure P of the gas outlet after the separation of the cyclone gas-liquid separatorg2Calculated using the following formula:
Figure BDA0001769945920000042
in the formula (3), Δ PQi (Qi)Is the difference between the inlet pressure of the cyclone gas-liquid separator and the pressure of the air outlet, kPa; p1The pressure at the inlet of the cyclone gas-liquid separator is MPa; qIIs the total flow of liquid and gas phases at the inlet of the cyclone gas-liquid separator, m3/d；FkThe split ratio of the cyclone gas-liquid separator is dimensionless; a is1、a2、a3、a4、a5Are respectively constant terms;
gas path temperature T of gas outlet after separation of cyclone gas-liquid separatorg2With temperature T at the inlet of the gas-liquid separator1Equal, i.e. Tg2＝T1。
Further, in the step ten, the total flow Q of the liquid phase and the gas phase at the liquid outlet after the separation by the rotational flow gas-liquid separator is obtainedlCalculated using the following formula:
Ql＝Fk×QI (4)
in the formula (4), FkThe split ratio of the cyclone gas-liquid separator is dimensionless; qITotal flow of liquid and gas phases at the inlet of a cyclone gas-liquid separator, i.e. QI＝Qil1+Qig1，m3/d。
Further, in the step ten, the gas content f of the liquid outlet after separation by the cyclone gas-liquid separatorg2Calculated using the following formula:
Figure BDA0001769945920000043
in the formula (5), FkThe split ratio of the cyclone gas-liquid separator is dimensionless; f is the optimal split ratio of the cyclone gas-liquid separator and is dimensionless.
Further, in the tenth step, the pressure P of the liquid outlet after separation by the cyclone gas-liquid separatorl2Calculated using the following formula:
Figure BDA0001769945920000051
in the formula (6), Δ PLiquid for treating urinary tract infectionThe difference value of the inlet pressure and the outlet pressure of the cyclone gas-liquid separator is MPa; p1The pressure at the inlet of the cyclone gas-liquid separator is MPa; qITotal flow of liquid and gas phases at the inlet of a cyclone gas-liquid separator, i.e. QI＝Qil1+Qig1，m3/d；FkThe split ratio of the cyclone gas-liquid separator is dimensionless; b1、b2、b3、b4、b5Respectively, constant terms.
The invention has the beneficial effects that:
the invention firstly provides a flow split ratio concept in the field of underground gas-liquid separation and extraction, and establishes an analysis method of a suspended underground cyclone gas-liquid separation combined lifting system based on the physical meaning of the flow split ratio.
The system analysis method established by the invention can solve the difficult problems of failure of the underground gas-liquid separate production process when the production of the subsystem is uncoordinated, the system operation efficiency is low or serious.
And thirdly, the system analysis method provided by the invention takes four parts of the underground rotational flow gas-liquid separator, the electric pump unit, the gas production oil pipe and the liquid-gas injection system as an integral research object, provides a system analysis method based on pressure, gas quantity and liquid quantity, and can guide the design of underground gas-liquid separation process parameters and production control.
And fourthly, the system analysis method established by the invention has clear thought, reliable calculation method and simple system coordination control, and can be widely applied to the design and analysis of the offshore high gas-liquid ratio oil well lifting process.
Drawings
FIG. 1 is a diagram of a subsystem configuration of an analytical method of a suspensible downhole cyclone gas-liquid separation combined lifting system provided by the invention;
FIG. 2 is a flow chart of the calculation of the analysis method of the suspensible downhole cyclone gas-liquid separation combined lifting system provided by the invention.
The attached drawings are marked as follows: 1. a liquid-gas ejector pump; 2. a gas production tubing; 3. an electric pump unit; 4. a gas path regulating device; 5. and a rotational flow gas-liquid separator.
Detailed Description
In order to further understand the contents, features and effects of the present invention, the following embodiments are illustrated and described in detail with reference to the accompanying drawings:
the application establishes a set of system analysis method by taking a process pipe column given in patent document CN 107420084A as a background. As shown in fig. 1, a process column disclosed in patent document CN 107420084 a includes a liquid-gas ejector pump 1, a gas production pipe 2, an electric pump unit 3, a gas path regulator 4, and a cyclone gas-liquid separator 5.
The invention provides a suspended type underground cyclone gas-liquid separation combined lifting system analysis method, wherein basic parameters of single well design are shown in a table 1.
TABLE 1 Single well design basic parameter table
Parameter name Unit of Value of parameter
Static pressure of reservoir Pi MPa 15
Target fluid production Qil m3/d 80
Target gas production QigConditions deep in the oil layer m3/d 125
Liquid content fl ％ 39.1
Temperature T of the formationi ℃ 76.5
Well head back pressure Pc MPa 2.5
Rated discharge capacity of electric pump unit 3 m3/d 80
Rated lift of electric pump unit 3 m 1500
Initial value of running frequency of electric pump unit 3 Hz 35
Initial value H of depth under 3 of electric pump unit1， m 1200
Initial depth h of cyclone gas-liquid separator 51 m 1250
The invention provides a suspended type underground cyclone gas-liquid separation combined lifting system analysis method, a calculation flow chart of which is shown in figure 2, and the method specifically comprises the following steps:
step S101: given target fluid production QilTarget gas production Qig@ mid-depth working condition of oil layer, static pressure P of oil reservoiri(ii) a Liquid content f at the inlet of a given cyclone gas-liquid separator 5lGiven formation temperature Ti。
Step S102: the lower depth of the electric pump unit 3 is made to be HjLet the lower depth of the cyclone gas-liquid separator 5 be hjWhere j represents the number of iterations, a positive integer starting from 1, H1For a given initial value of depth h under the electric pump unit 31The initial value of the lower depth of the given cyclone gas-liquid separator 5; given wellhead back pressure Pc。
Step S103: according to the target fluid production amount QilTarget gas production Qig@ mid-depth working condition of oil layer, static pressure P of oil reservoiriCalculating bottom hole flowing pressure Pwf；PwfCalculating according to an oil well inflow dynamic curve, namely an IPR curve;
according to the lower depth h of the cyclone gas-liquid separator 5jBottom hole flowing pressure PwfAnd formation temperature TiCalculating the liquid phase flow Q at the inlet of the cyclone gas-liquid separator 5il1Flow rate of gas phase Qig1Pressure P1And temperature T1(ii) a Liquid phase flow Q at inlet of cyclone gas-liquid separator 5il1With the target fluid production amount QilEqual value, gas phase flow rate Qig1The pressure P at the inlet of the cyclone gas-liquid separator 5 is calculated according to the Van der Waals equation1Calculating according to a Beggs-Brill method; temperature T at inlet of cyclone gas-liquid separator 51Calculated according to the Ramey method.
Step S104: the flow division ratio of the cyclone gas-liquid separator 5 at any time is set to FkK represents the number of iterations and is a positive integer starting from 1, F1The initial value of the given split ratio is set;
split ratio F in the inventionkIs defined as:
Figure BDA0001769945920000071
in the formula (1), QlIs the total flow of liquid and gas phases of the liquid outlet after the separation of the cyclone gas-liquid separator 5, m3/d；QITotal flow of liquid and gas phases at the inlet of the cyclone gas-liquid separator 5, i.e. QI＝Qil1+Qig1，m3/d。
In the actual process, the split ratio FkCan be adjusted by delta PQi (Qi)And Δ PLiquid for treating urinary tract infectionIs achieved by the ratio ofQi (Qi)Is the difference between the inlet pressure and the outlet pressure of the cyclone gas-liquid separator 5, kPa; delta PLiquid for treating urinary tract infectionIs the difference between the inlet pressure and the outlet pressure of the cyclone gas-liquid separator 5, kPa.
According to the split ratio FkCalculating the gas path flow Q of the gas outlet after the cyclone gas-liquid separator 5 is separatedgGas path pressure Pg2And gas path temperature Tg2：
A. After the cyclone gas-liquid separator 5 is separatedWhen the liquid outlet of (1) does not contain gas and the gas outlet does not contain liquid, F at the momentkDefined as the optimum split ratio and expressed by F, the following calculation relation can be obtained to calculate the gas path flow Q of the gas outlet after the separation of the cyclone gas-liquid separator 5g：
Qg＝QI[(1-fl)-(Fk-F)] (2)
In the formula (2), QIIs the total flow rate of liquid and gas phases at the inlet of the cyclone gas-liquid separator 5, m3/d；flThe liquid content at the inlet of the cyclone gas-liquid separator 5 is percent; fkThe split ratio of the cyclone gas-liquid separator 5 is dimensionless; f is the optimal split ratio of the cyclone gas-liquid separator 5 and is dimensionless.
B. Gas path pressure P of gas outlet after separation of cyclone gas-liquid separator 5g2Calculated using the following formula:
Figure BDA0001769945920000072
in the formula (3), Δ PQi (Qi)Is the difference between the inlet pressure and the outlet pressure of the cyclone gas-liquid separator 5, kPa; p1The pressure at the inlet of the cyclone gas-liquid separator 5 is MPa; qITotal flow of liquid and gas phases at the inlet of the cyclone gas-liquid separator 5, i.e. QI＝Qil1+Qig1，m3/d；FkThe split ratio of the cyclone gas-liquid separator 5 is dimensionless; a is1、a2、a3、a4、a5Are respectively constant terms and can be obtained by indoor experimental tests.
C. Assuming that the temperature loss after passing through the cyclone gas-liquid separator 5 is negligible, the gas path temperature T of the gas outlet after separation by the cyclone gas-liquid separator 5g2With the temperature T at the inlet of the gas-liquid separator 51Equal, i.e. Tg2＝T1。
Step S105: according to the gas path flow Q of the gas outlet after the separation of the cyclone gas-liquid separator 5gGas path pressure Pg2And gas path temperature Tg2Calculating the gas path gas amount Q after passing through the gas path regulating device 4g3Pressure of gas pathForce Pg3And gas path temperature Tg3(ii) a Gas path gas quantity Q after passing through gas path regulating device 4g3And the pressure P of the gas circuitg3Simultaneously solving and calculating according to a van der Waals equation and an air nozzle flow equation; gas circuit temperature T after passing through gas circuit regulating device 4g3And calculating according to an air tap throttling temperature drop equation.
Step S106: let the diameter of the gas production tubing 2 be diI represents the number of iterations, a positive integer starting from 1, d1The diameter is a given initial value of the diameter of the gas production oil pipe 2;
according to the gas path gas quantity Q passing through the gas path regulating and controlling device 4g3Gas path pressure Pg3And gas path temperature Tg3And diameter d of the gas production tubing 2iFinally obtaining the critical liquid carrying flow q of the gas production oil pipe 2 by calculating the on-way pressure and temperature of the gas production oil pipe 2c(ii) a Critical liquid carrying flow q of gas production tubing 2cCalculated according to the Turner model method.
Step S107: judging whether the designed gas production oil pipe 2 meets the liquid carrying requirement, wherein the judgment standard is as follows: when q isc>QgIf the gas production oil pipe 2 does not meet the liquid carrying requirement, executing the step S108; when q isc<QgIf so, the gas production pipe 2 meets the liquid carrying requirement, and step S109 is executed.
Step S108: if the gas production pipe 2 does not meet the liquid carrying requirement, the diameter d of the gas production pipe 2i＝diD-delta d, further judging whether d is 1.05 in. ltoreq. diLess than or equal to 2.375 in; the value range delta d belongs to (0.1in-0.2in) is generally recommended;
if yes, repeatedly executing the step S106;
if not, increasing the split ratio F of the cyclone gas-liquid separator 5k＝Fk+. DELTA F, then judge whether 0 < FkIf so, repeatedly executing the step S104; if not, increasing the lower depth H of the electric pump unit 3j＝Hj+. DELTA H and increase the lower depth H of the cyclone gas-liquid separator 5j＝hj+. ah, repeatedly executing step S102; the general recommended value ranges are within the range of delta F belonging to (0.05-0.01), the range of delta H belonging to (50m-100m) and the range of delta H belonging to (50m-100 m).
Step S109: if the gas production oil pipe 2 meetsCarrying liquid requirement according to the gas path gas quantity Q passing through the gas path adjusting device 4g3Gas path pressure Pg3And gas path temperature Tg3Calculating the on-way gas quantity, the temperature and the pressure of the gas production oil pipe 2 to finally obtain the gas quantity Q of the gas circuit suction inlet of the liquid-gas ejector pump 1g4Pressure P of suction inlet of gas pathg4Temperature T of suction inlet of gas circuitg4(ii) a Gas flow Q of gas path suction inlet of liquid-gas ejector pump 1g4The pressure P of the gas path suction inlet is calculated according to the Van der Waals equationg4The temperature T of the suction inlet of the gas path is calculated according to a static gas column pressure formula methodg4Calculated according to the Ramey method.
Step S110: according to the flow dividing ratio F of the gas production oil pipe 2 meeting the liquid carrying requirementkCalculating the total flow Q of liquid and gas phases at the liquid outlet after the mixed liquid is separated by the cyclone gas-liquid separator 5lGas content fg2And pressure Pl2；
Liquid-gas two-phase total flow Q of liquid outlet after separation of cyclone gas-liquid separator 5lCalculated using the following formula:
Ql＝Fk×QI (4)
in the formula (4), FkThe split ratio of the cyclone gas-liquid separator 5 is dimensionless; qITotal flow of liquid and gas phases at the inlet of the cyclone gas-liquid separator 5, i.e. QI＝Qil1+Qig1，m3/d。
Gas content f of liquid outlet after separation of cyclone gas-liquid separator 5g2Calculated using the following formula:
Figure BDA0001769945920000091
in the formula (5), FkThe split ratio of the cyclone gas-liquid separator 5 is dimensionless; f is the optimal split ratio of the cyclone gas-liquid separator 5 and is dimensionless;
pressure P of liquid outlet after separation of cyclone gas-liquid separator 5l2Calculated using the following formula:
Figure BDA0001769945920000092
in the formula (6), Δ PLiquid for treating urinary tract infectionThe difference value of the inlet pressure and the outlet pressure of the cyclone gas-liquid separator 5 is MPa; p1The pressure at the inlet of the cyclone gas-liquid separator 5 is MPa; qITotal flow of liquid and gas phases at the inlet of the cyclone gas-liquid separator 5, i.e. QI＝Qil1+Qig1，m3/d；FkThe split ratio of the cyclone gas-liquid separator 5 is dimensionless; b1、b2、b3、b4、b5Are respectively constant terms and can be obtained by indoor experimental tests.
Step S111: according to the depth H below the electric pump unit 3jThe total flow Q of liquid and gas phases at the liquid outlet after separation by the cyclone gas-liquid separator 5lGas content fg2And pressure Pl2Calculating the annular pressure and temperature of the oil sleeve to finally obtain the liquid path flow Q of the inlet of the electric pump unit 3l3Pressure P of liquid pathl3Temperature T of the liquid pathl3(ii) a Liquid path pressure P of inlet of electric pump unit 3l3Calculating the liquid path temperature T of the inlet of the electric pump unit 3 according to a Beggs-Brill methodl3Calculating according to a Ramey method; liquid-gas two-phase total flow Q of inlet of electric pump unit 3l3The total flow Q of liquid and gas phases at the liquid outlet after separation from the cyclone gas-liquid separator 5lThe values are equal.
Step S112: setting the rated discharge capacity and rated lift of the electric pump unit 3 to make the running frequency fmM represents the number of iterations and is a positive integer starting from 1, f1The initial value of the given running frequency is obtained;
according to the total flow Q of liquid and gas phases at the inlet of the electric pump unit 3l3(Ql3＝Ql) Pressure P of liquid pathl3Temperature T of the liquid pathl3Calculating the liquid path flow Q at the outlet of the electric pump unit 3l4Pressure P of liquid pathl4Temperature T of the liquid pathl4(ii) a Liquid-way liquid-gas two-phase total flow Q at outlet of electric pump unit 3l4The total flow Q of liquid and gas phases at the liquid outlet after separation from the cyclone gas-liquid separator 5lEqual in value, the hydraulic pressure P at the outlet of the electric pump unit 3l4Temperature T of the liquid pathl4And calculating according to an electric pump lifting principle method.
Step S113: the high-pressure liquid in the liquid path passing through the electric pump unit 3 is used as the power liquid of the liquid-gas ejector pump 1, and the power liquid amount is set to be Ql4The power hydraulic pressure is Pl4(ii) a The gas passing through the gas circuit at the upper end of the gas production oil pipe 2 is taken as the gas output of the gas circuit suction inlet of the liquid-gas ejector pump 1, and the gas output Q is obtained according to the gas output Q of the gas circuit suction inlet of the liquid-gas ejector pump 1g4Pressure P of suction inlet of gas pathg4Temperature T of suction inlet of gas circuitg4Calculating the liquid-gas injection process parameters based on the conditions; the liquid-gas injection process parameters are calculated according to the method in chapter 4, section 4 of the oil extraction project (second edition) written by professor Leying Yingchuan to obtain the outlet pressure P of the liquid-gas injection pump 15。
Step S114: according to the outlet pressure P of the liquid-gas ejector pump 15Calculating the on-way pressure after gas-liquid mixing to finally obtain the wellhead pressure Pt(ii) a Wellhead pressure PtCalculated according to the Beggs-Brill method.
Step S115: if P is judgedt-PcIf yes, executing step S116; if yes, go to step S117.
Step S116: if Pt-PcIf the frequency is larger than 0, increasing the running frequency f of the electric pump unit 3m＝fmPositive delta f, further judging whether f is less than or equal to 30HzmLess than or equal to 60Hz, if fmIf the condition is satisfied, repeatedly executing step S112; the value range delta f is generally recommended to be within the range of 2 Hz-5 Hz;
if fmIf the condition is not satisfied, the flow division ratio F of the cyclone gas-liquid separator 5 is increasedk＝Fk+. DELTA F, then judge whether 0 < FkIf so, repeatedly executing the step S104; if not, increasing the lower depth H of the electric pump unit 3j＝Hj+. DELTA H and lower depth H of cyclone gas-liquid separator 5j＝hj+. ah, repeatedly executing step S102; the general recommended value ranges are within the range of delta F belonging to (0.05-0.01), the range of delta H belonging to (50m-100m) and the range of delta H belonging to (50m-100 m).
Step S117: if Pt-PcIf > 0, the calculation ends.
According to the analysis method of the suspensible underground cyclone gas-liquid separation combined lifting system, the design result can be calculated and obtained, and is shown in table 2.
TABLE 2 Single well design achievement table
Figure BDA0001769945920000101
Figure BDA0001769945920000111
Experiments prove that the analysis method of the suspensible underground rotational flow gas-liquid separation combined lifting system, which is established by the invention, realizes the gas-liquid separation production process design with the underground gas content within the working condition range of 55-95%, and the design method can realize that the gas outlet does not contain liquid after the separation of the rotational flow gas-liquid separator 5, the gas content of the liquid outlet is less than 10%, and further improves the system efficiency of the conventional electric pump unit 3 in the high gas-liquid ratio oil well lifting by about 20%.
Although the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and those skilled in the art can make various changes and modifications within the spirit and scope of the present invention without departing from the spirit and scope of the appended claims.

Claims (1)

1. A suspended type underground cyclone gas-liquid separation combined lifting system analysis method is characterized by comprising the following steps:
the method comprises the following steps: given target fluid production QilTarget gas production QigStatic pressure of reservoir Pi(ii) a Liquid content f for a given inlet of a cyclone gas-liquid separatorlGiven formation temperature Ti；
Step two: the lower depth of the electric pump unit is made to be HjLet the lower depth of the cyclone gas-liquid separator be hjWhereinJ represents the number of iterations, which is a positive integer starting from 1, H1For a given initial value of depth, h, below the electric pump unit1The initial value of the lower depth of the given cyclone gas-liquid separator is obtained; given wellhead back pressure Pc；
Step three: according to the target fluid production amount QilTarget gas production QigStatic pressure of reservoir PiCalculating bottom hole flowing pressure Pwf；
According to the lower depth h of the cyclone gas-liquid separatorjBottom hole flowing pressure PwfAnd formation temperature TiCalculating the liquid phase flow Q at the inlet of the cyclone gas-liquid separatoril1Flow rate of gas phase Qig1Pressure P1And temperature T1；
Step four: the flow division ratio of the cyclone gas-liquid separator at any moment is set to be FkK represents the number of iterations and is a positive integer starting from 1, F1The initial value of the given split ratio is set;
according to the split ratio FkCalculating the gas path flow Q of the separated gas outlet of the cyclone gas-liquid separatorgGas path pressure Pg2And gas path temperature Tg2；
Step five: according to the gas path flow Q of the separated gas outlet of the cyclone gas-liquid separatorgGas path pressure Pg2And gas path temperature Tg2Calculating the gas path gas amount Q after passing through the gas path regulating deviceg3Gas path pressure Pg3And gas path temperature Tg3；
Step six: let the diameter of the gas production oil pipe be diI represents the number of iterations, a positive integer starting from 1, d1The diameter is a given initial value of the diameter of the gas production oil pipe;
according to the gas path gas quantity Q after passing through the gas path regulating and controlling deviceg3Gas path pressure Pg3And gas path temperature Tg3And diameter d of the production tubingiAnd calculating to obtain the critical liquid carrying flow q of the gas production oil pipec；
Step seven: judging whether the designed gas production oil pipe meets the liquid carrying requirement or not, wherein the judgment standard is as follows: when q isc>QgIf the gas production pipe does not meet the liquid carrying requirement, executing the step eight; when q isc<QgIf so, the gas production pipe meets the liquid carrying requirement, and the ninth step is executed;
step eight: diameter d of gas production oil pipei＝diD-delta d, further judging whether d is 1.05 in. ltoreq. di≤2.375in；
If yes, repeating the step six;
if not, the flow dividing ratio F of the cyclone gas-liquid separator is setk＝Fk+. DELTA F, then judge whether 0 < FkIf so, repeatedly executing the step four; if not, the lower depth H of the electric pump unit is controlledj＝Hj+. DELTA.H, lower depth of cyclone gas-liquid separatorj＝hjB, repeatedly executing the step two;
step nine: according to the gas path gas quantity Q after passing through the gas path adjusting deviceg3Gas path pressure Pg3And gas path temperature Tg3And calculating to obtain the gas flow Q of the gas path suction inlet of the liquid-gas ejector pumpg4Pressure P of suction inlet of gas pathg4Temperature T of suction inlet of gas circuitg4；
Step ten: according to the split ratio F of the cyclone gas-liquid separatorkCalculating the total flow Q of liquid and gas phases at the liquid outlet after separation by the cyclone gas-liquid separatorlGas content fg2And pressure Pl2；
Step eleven: according to the lower depth H of the electric pump unitjThe total flow Q of liquid and gas phases at the liquid outlet after the separation of the cyclone gas-liquid separatorlGas content fg2And pressure Pl2And calculating to obtain the flow Q of the liquid path at the inlet of the electric pump unitl3Pressure P of liquid pathl3Temperature T of the liquid pathl3；
Step twelve: setting rated discharge capacity and rated lift of electric pump unit to make operation frequency fmM represents the number of iterations and is a positive integer starting from 1, f1The initial value of the given running frequency is obtained;
according to the total flow Q of liquid and gas phases at the inlet of the electric pump unitl3Pressure P of liquid pathl3Temperature T of the liquid pathl3Calculating the liquid path flow Q of the outlet of the electric pump unitl4Pressure P of liquid pathl4Temperature T of the liquid pathl4；
Step thirteen: the high-pressure liquid in the liquid path passing through the electric pump unit is used as the power liquid of the liquid-gas ejector pump, and the power liquid amount is set to be Ql4The power hydraulic pressure is Pl4(ii) a The gas passing through the gas circuit at the upper end of the gas production oil pipe is used as the gas output of the gas circuit suction inlet of the liquid-gas ejector pump, and the gas output Q is obtained according to the gas output Q of the gas circuit suction inlet of the liquid-gas ejector pumpg4Pressure P of suction inlet of gas pathg4Temperature T of suction inlet of gas circuitg4Calculating the parameters of the liquid-gas injection process based on the above conditions to obtain the outlet pressure P of the liquid-gas injection pump5；
Fourteen steps: according to the outlet pressure P of the liquid-gas ejector pump5And calculating to obtain wellhead pressure Pt；
Step fifteen: if P is judgedt-PcIf yes, executing step sixteen; if yes, executing seventeen;
sixthly, the steps are as follows: if Pt-PcIf more than 0 is not true, the running frequency f of the electric pump unit is enabledm＝fmPositive delta f, further judging whether f is less than or equal to 30Hzm≤60Hz；
If yes, repeating the step twelve;
if not, the flow dividing ratio F of the cyclone gas-liquid separator is setk＝Fk+. DELTA F, then judge whether 0 < FkIf so, repeatedly executing the step four; if not, the lower depth H of the electric pump unit is controlledj＝Hj+. DELTA.H, lower depth of cyclone gas-liquid separatorj＝hjB, repeatedly executing the step two;
seventeen steps: if Pt-PcIf the result is more than 0, the calculation is finished;
the flow division ratio of the cyclone gas-liquid separator at any moment in the fourth step is defined as:
Figure FDA0003000039670000021
in the formula (1), QlIs a liquid-gas separator of the separated liquid outlet of the cyclone gas-liquid separatorTotal flow of phases, m3/d；QITotal flow of liquid and gas phases at the inlet of a cyclone gas-liquid separator, i.e. QI＝Qil1+Qig1，m3/d；
In the fourth step, the gas path flow Q of the gas outlet after the cyclone gas-liquid separator separatesgCalculated using the following formula:
Qg＝QI[(1-fl)-(Fk-F)] (2)
in the formula (2), QITotal flow of liquid and gas phases at the inlet of a cyclone gas-liquid separator, i.e. QI＝Qil1+Qig1，m3/d；flThe liquid content of the inlet of the cyclone gas-liquid separator is percent; fkThe split ratio of the cyclone gas-liquid separator is dimensionless; f is the optimal split ratio of the cyclone gas-liquid separator and is dimensionless;
wherein, when the liquid outlet after the separation of the cyclone gas-liquid separator does not contain gas and the gas outlet does not contain liquid, F at the momentkDefining an optimal flow dividing ratio and expressing the optimal flow dividing ratio by F;
in the fourth step, the gas path pressure P of the gas outlet after the separation of the cyclone gas-liquid separatorg2Calculated using the following formula:
Figure FDA0003000039670000031
in the formula (3), Δ PQi (Qi)Is the difference between the inlet pressure of the cyclone gas-liquid separator and the pressure of the air outlet, kPa; p1The pressure at the inlet of the cyclone gas-liquid separator is MPa; qIIs the total flow of liquid and gas phases at the inlet of the cyclone gas-liquid separator, m3/d；FkThe split ratio of the cyclone gas-liquid separator is dimensionless; a is1、a2、a3、a4、a5Are respectively constant terms;
gas path temperature T of gas outlet after separation of cyclone gas-liquid separatorg2With temperature T at the inlet of the gas-liquid separator1Equal, i.e. Tg2＝T1；
Said step (c) isThe liquid-gas two-phase total flow Q of the liquid outlet after the separation of the cyclone gas-liquid separator in the ten deviceslCalculated using the following formula:
Ql＝Fk×QI (4)
in the formula (4), FkThe split ratio of the cyclone gas-liquid separator is dimensionless; qITotal flow of liquid and gas phases at the inlet of a cyclone gas-liquid separator, i.e. QI＝Qil1+Qig1，m3/d；
The gas content f of the liquid outlet after the separation of the rotational flow gas-liquid separator in the step ten isg2Calculated using the following formula:
Figure FDA0003000039670000032
in the formula (5), FkThe split ratio of the cyclone gas-liquid separator is dimensionless; f is the optimal split ratio of the cyclone gas-liquid separator and is dimensionless;
the pressure P of the liquid outlet after the separation of the cyclone gas-liquid separator in the step ten isl2Calculated using the following formula:
Figure FDA0003000039670000033
in the formula (6), Δ PLiquid for treating urinary tract infectionThe difference value of the inlet pressure and the outlet pressure of the cyclone gas-liquid separator is MPa; p1The pressure at the inlet of the cyclone gas-liquid separator is MPa; qITotal flow of liquid and gas phases at the inlet of a cyclone gas-liquid separator, i.e. QI＝Qil1+Qig1，m3/d；FkThe split ratio of the cyclone gas-liquid separator is dimensionless; b1、b2、b3、b4、b5Respectively, constant terms.
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