RU2521623C1 - Method for identification of well with variable mass flow rate at well pad - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: method lies in continuous monitoring of the total mass flow rate M_li and volumetric gas discharge Q_gi and calculation of the coefficient $$K_i=\frac{\Delta M_{li}}{\Delta Q_{gi}}$$

, where ΔM_li and ΔQ_gi respectively for the difference of the previous (stored) and current average numerical values of the total expense parameters of the well pad $${\overline{M}}_{li}$$

and $${\overline{Q}}_{gi}.$$

When the numerical value K_i deviates from the range of the preset values, the total flow mass rate of the liquid M_li(n-1) and the total flow mass rate of free gas Q_gi(n-1) for (n-1) wells, where n is the total number of wells in the well pad, the flow mass rate of the liquid (water-oil mixture) M_li=M_li-M_(n-1), the flow mass rate of free gas Q_gi=Q_gi-Q_gi(n-1) and $$K_i=\frac{M_{li}}{Q_{gi}}$$

coefficient is calculated for each well. Thereafter the numerical values of K_i are compared for each well with the current numerical value K_i, and the well with a variable flow mass rate in the well pad is identified against the minimum difference between the numerical value K_i of one well in the well pad and the numerical value of K_i coefficient.

EFFECT: identification of the well with the variable flow mass rate of the liquid in the well pad directly in the process of the well flow rates measurement.

2 cl, 1 dwg

Description

The invention relates to the field of measuring and controlling the flow rate of oil wells and can be used in information-measuring systems for production, transport, preparation of oil, gas and water.

Known method for identifying the well with the modified mass flow of oil wells bush products, consisting in measuring on a group measuring installation, alternately for each well well cluster over a fixed time interval, consumable downhole parameters: mass flow rate (water-oil mixture) M _zhi, the volumetric flow rate of free gas Q _gi and the mass flow rate of crude oil M _ni , as well as in the simultaneous continuous measurement of the integral flow rate parameters of the wellbore: mass flow rate of the liquid (oil-water nth mixture) _Man and the volumetric gas flow rate Q _gi , implemented on the installation for measuring the flow rate of a group of oil wells, containing a group metering unit, the output of which is connected to an intermediate manifold pipeline. The second end of the manifold pipe is connected to the side pipe of an additional vertical separator tank, the upper and lower pipes of which are connected to additional associated gas and liquid discharge pipelines with, respectively, a volumetric gas flow meter and a liquid mass flow meter transducer installed at this second ends of the additional pipelines for the removal of associated gas and drain the liquid are connected through a check valve to the oil collector (Patent RF №115824, publ. 10.05.2012).

In this device, the presence of additional transducers of a volumetric flow meter-gas meter and a mass flow meter-fluid meter for measuring the integral flow rates of a group of wells by fluid and gas allows to increase the reliability of measurements of the flow rate of oil wells due to the duplication of measurements, provides the possibility of continuous adjustment (refinement) of the algorithm for measuring the component composition well production by comparing the results of discrete measurements of flow rates with the results of instantaneous measurements of the integral flow rates using flow meters, liquid and gas meters. The method implemented by this installation allows you to quickly detect a decrease in the total fluid flow rate of an oil well cluster, because this parameter is used for continuous monitoring, and to quickly respond to this deviation, namely, to conduct a visual inspection of the wells directly on the cluster and identify a well with a changed operating mode from them.

Thus, in the known method, changing the total flow rate of the wellbore fluid gives the operator only a signal about a change in the operating mode of one of the wells, but does not decrypt this signal, does not identify a specific well with a disturbed operating mode.

The closest technical solution (prototype) to the claimed method is a method for identifying a well with a modified mass flow rate of the liquid of an oil well cluster, which consists in connecting all of the producing wells in a cluster to an intermediate oil collector and continuous measurement by means of a non-separating flowmeter installed on the intermediate oil collector, for example, multiphase, total consumables well cluster parameters: mass flow rate of liquid (oil-water mixture) and _Ms M obemnog gas flow Q _gi, all production wells connected to the intermediate oil collecting manifold through switch oil wells, with each well retraction production oil well cluster through bypass conduit bypassing besseparatsionnogo flowmeter.

In this method, the controller, according to the special program built into it, monitors the differences in the total (over the well of oil wells) production rates (in oil, gas and water), measured, respectively, by a group metering device (discrete measurement method) and a multiphase flow meter (continuous method measurements), and by deviating the difference in flow rates beyond the limits set in the controller (for oil, gas and water), the operator makes one or another decision regarding changes in the mass flow rate of wells (Application No. 2011114553/03 (051192), dec statement on the grant of a patent for an invention dated 10.01.2013).

This method allows you to identify violations of the operating modes of the oil wells of the cluster (group) of oil wells using the results of discrete (GZU) and continuous (multiphase flow meter) measurements, however, it also has a significant drawback, which consists, firstly, in that it does not make it possible to identify a specific well with a disrupted operating mode, and secondly, this method does not make it possible, or at least difficult to determine the nature (cause) of a violation of this operating mode.

The problem to which the claimed invention is directed, is to provide the ability to identify wells with a changed mass flow rate of the fluid in the oil well cluster directly in the process of measuring the flow rate of wells.

, где ΔМ_жи и ΔQ_ги соответственно разности предыдущих и текущих средних численных значений суммарных расходных параметров куста нефтяных скважин $${\overline{M}}_{жи}$$

и $${\overline{Q}}_{ги}$$

, сравнивают вычисленные значения К_и с его предварительно заданным в диапазоне допустимых отклонений значением ±ΔК_и и, в случае отклонения К_и от заданных значений, путем поочередного переключения отвода продукции каждой из скважин в байпасный трубопровод, измеряют суммарный массовый расход жидкости М_жи(n-1) и суммарный объемный расход свободного газа Q_ги(n-1) по (n-1) скважинам, где n - общее число скважин в кусте, вычисляют по каждой скважине массовый расход жидкости (водонефтяной смеси) М_жi=М_жи-М_жи(n-1), объемный расход свободного газа Q_гi=Q_ги-Q_ги(n-1) и коэффициент $$K_i=\frac{M_{жi}}{Q_{гi}}$$

, после чего сравнивают численные значения коэффициентов К_i по каждой скважине с текущим численным значением К_и, а скважину с измененным массовым расходом жидкости куста нефтяных скважин идентифицируют по признаку минимальной разности между численным значением К_i одной из скважин куста нефтяных скважин и численным значением коэффициента К_и.The technical result is achieved in that in a method for identifying a well with a modified mass flow rate of an oil well cluster, which involves connecting all of the producing wells to an intermediate oil recovery reservoir and continuous measurement by means of a non-separation flow meter installed on the intermediate oil recovery reservoir, for example, multiphase, total flow parameters of the well cluster: mass fluid flow (oil-water mixture) and _Ms M volumetric gas flow Q _gi, all extractive skva ins connected to the intermediate oil collecting manifold through switch oil wells, with each well retraction production oil well cluster through bypass conduit bypassing besseparatsionnogo flowmeter continuously calculating a numerical value of the coefficient $$K_{\mathrm{and}}=\frac{\Delta M_{\mathrm{well}\mathrm{and}}}{\Delta Q_{g\mathrm{and}}}$$

Where _Ms ΔM _w and ΔQ, respectively, difference of the previous and current average numerical values of parameters of total consumable oil wells bush $${\overline{M}}_{\mathrm{well}\mathrm{and}}$$

and $${\overline{Q}}_{g\mathrm{and}}$$

, Compare the calculated values of _{K, and} with it to specify the range of allowable deviation value ± ΔK _and and, in case of deviation to _and from the target values, by alternately switching drain output of each of the wells in the bypass pipe, measured total mass flow rate M _{Ms (n -1)} and total free gas volume flow Q _{gi (n-1)} to (n-1) wells, where n - the total number of wells in the bush, is calculated for each well mass flow rate of liquid (oil-water mixture) M = M _{zhi Ms} - _{Ms (n-1)} , volumetric flow rate of free gas Q _gi = Q _gi- q _{gi (n-1)} and coefficient $$K_i=\frac{M_{\mathrm{well}i}}{Q_{gi}}$$

and then compare the numerical values of the coefficients K _i for each well with the current numerical value K _and , and the well with the changed mass flow rate of the liquid in the oil well cluster is identified by the minimum difference between the numerical value K _{i of} one of the wells in the oil well cluster and the numerical value of the coefficient K _and .

In addition to this, during the operation of the oil well cluster after each subsequent deviation of the current numerical value K _and beyond the specified settings ± ΔK _and with the subsequent identification of the i-th well with a changed mass flow rate, these current numerical values K _i and K _and take as predefined, while maintaining the numerical value of the tolerance ± ΔK _and .

и идентификация скважины с измененным расходом по признаку минимальной разности между численными значениями коэффициентов K_i по каждой скважине с текущим численным значением К_и позволяет идентифицировать скважину с измененным массовым расходом куста нефтяных скважин непосредственно в процессе измерения дебита скважин.Continuous determination of the ratio of the total flow rate parameters: the mass flow rate of the liquid to the volumetric flow rate of the gas, a comparison of these values at each moment of time with its predetermined value, and, if there is a deviation from the set values, measurement of the total mass flow rate of the liquid _{Ms (n-1)} and the total volumetric flow rate of free gas Q _{gi (n-1)} for (n-1) wells, where n is the total number of wells in the well, calculation for each well of the mass flow rate of liquid М _жi , volumetric flow rate of free gas Q _gi and coefficient $$K_i=\frac{M_{\mathrm{well}i}}{Q_{gi}}$$

and identification of a well with a changed flow rate based on the minimum difference between the numerical values of the coefficients K _i for each well with the current numerical value K _and allows you to identify a well with a changed mass flow rate of a cluster of oil wells directly in the process of measuring the flow rate of wells.

The drawing shows a schematic diagram of a device for measuring the flow rate of a cluster of oil wells that implements the proposed method.

In this device for measuring the flow rate of oil wells, all the wells in the cluster of oil wells 1 are connected to the intermediate oil collector 2 through a multi-way switch 3 wells (PSM). Using the bypass pipeline 4, it is possible to switch the output of each of the wells of the well 1 through the well switch 3, bypassing the non-separating, for example multiphase, flow meter 5 installed with the controller (not shown) on the intermediate oil collector 2, which, in turn, check valve 6 is connected to the oil collector (not shown in the drawing).

In the process of operation of this device, a multiphase flow meter 5, installed at the output of the intermediate oil collector 4, continuously monitors (measures) the total (over the well of oil wells) flow parameters for the liquid (oil-water mixture _Ms ) and for the volume flow of free gas Q _gi . Measurements are taken, respectively, in units of mass and volume.

An integrated estimate of the mass flow rate of fluid obtained by continuous measurements allows you to instantly note the fact of a change in the operating mode of any of the wells. To determine these or other abnormalities in the operation of some oil wells the well cluster is natural to assume that this deviation will affect primarily on the change of a bush integral index of oil wells, for example, the total liquid mass flow M _yarn. It is also natural to assume that this change should be greater than the marginal error of its (consumption) measurement. It is also obvious that with a decrease in the mass flow rate of liquid М _{Жi of} one well at constant water cut (W _Ж = Const), the mass flow rate of oil M _{нi of} this well will change and, accordingly, the flow rate of free gas Q _gi will change.

Suppose that for each well of a cluster of oil wells we know (measured) the following daily expenditure parameters: М _жi , Q _Гi , M _нi , and K _i , where К _i is determined by the formula:

$${\text{K}}_{\text{i}}={\text{M}}_{\text{well}}{\text{/ Q}}_{\text{gi}}\text{.}\text{(one)}$$

Suppose that one of the oil well well cluster decreased mass flow of fluid on the value ΔM _zhi, then by the same amount change accordingly and the total mass flow rate M _yarn according to the formula:

$${\text{M}}_{\text{æè}}{}_{\text{/ from}}=M_{\text{æè}}\text{-}\Delta {\text{M}}_{\text{well}}\text{.}\text{(2)}$$

It is known that under the condition W _x = Const reduction of mass flow rate at the well will result in a reduction of mass of oil flow in accordance with the formula (see., E.g., Scientific and technical journal "Automation of the remote control and communication in the oil industry. M .: JSC "VNIIOENG", 2006. - No. 11. - S.4-19):

$$M_{ni}=M_{\mathrm{well}i}\cdot (\mathrm{one}-W\frac{{\rho }_{\mathrm{at}}}{{\rho }_{\mathrm{well}}}),\left(3\right)$$

where ρ _in and ρ _W - respectively, the density of water and liquid.

A change in the mass flow rate of the oil of the well, in turn, will lead to a decrease in the value of Q _{gi of the} well, since:

$$Q_{gi(p)}=M_{n\mathrm{about}}{G}_{\mathrm{from}\mathrm{at}}\frac{P_0}{P_p},\left(\mathrm{four}\right)$$

where Q _{gi (p)} is the gas flow rate under operating conditions; M _but - the mass flow of oil under normal conditions; G _St - the volume of free gas / per ton of oil; P ₀ and P _p - pressure, respectively, in normal and operating conditions.

With numerical value ΔM _zhi and using formula (3) and (4), is determined (calculated) total deviation parameters bush consumable oil wells Q _w and M _audio respectively for gas and oil. In general, the bush oil wells, these deviations will be equal to ΔM _Ms,? Q _gi and _no ΔM, and new supplies integrated parameters will accordingly be determined (calculated) by the formulas:

$${\text{M}}_{\text{w / n}}=M_{\mathrm{well}\mathrm{and}}-\Delta M_{\mathrm{well}\mathrm{and}};\left(5\right)$$

$$Q_{\text{g / n}}=Q_{g\mathrm{and}}-\Delta Q_{g\mathrm{and}};\left(6\right)$$

$${\text{M}}_{\text{n / a}}=M_{n\mathrm{and}}-\Delta M_{n\mathrm{and}}.\left(7\right)$$

Thus, a method for identifying a well with a changed mass flow rate of a liquid in an oil well cluster is as follows.

, где ΔМ_жи и ΔQ_ги соответственно разности предыдущих и текущих средних численных значений суммарных расходных параметров куста нефтяных скважин $${\overline{M}}_{жи}$$

и $${\overline{Q}}_{ги}$$

, в случае отклонения численного значения которого за пределы заданных уставок ±ΔК_и вычисляется и запоминается массовый расход жидкости (водонефтяной смеси) М_жi и объемный расход свободного газа Q_гi каждой скважины, соответственно по формулам М_жi=М_жи-М_жи(n-1) и Q_гi=Q_ги-Q_ги(n-1), где n - число скважин в кусте; М_жи(n-1) и Q_гu(n-1), соответственно, суммарный массовый расход жидкости и суммарный объемный расход свободного газа, измеренных в режиме байпасирования по (n-1) скважинам. Далее вычисляется и запоминается (с помощью контроллера) по каждой скважине куста нефтяных скважин численное значение коэффициента $$K_i=\frac{M_{жi}}{Q_{гi}}$$

, сравниваются численные значения коэффициентов K_i по каждой скважине с текущим численным значением К_и. Скважину с измененным массовым расходом жидкости куста нефтяных скважин идентифицируют по признаку минимальной разности между численным значением K_i одной из скважин куста нефтяных скважин и численным значением коэффициента К_и.For a cluster of oil wells, the numerical value of the coefficient is calculated and stored (using the controller) $$K_{\mathrm{and}}=\frac{\Delta M_{\mathrm{well}\mathrm{and}}}{\Delta Q_{g\mathrm{and}}}$$

Where _Ms ΔM _w and ΔQ, respectively, difference of the previous and current average numerical values of parameters of total consumable oil wells bush $${\overline{M}}_{\mathrm{well}\mathrm{and}}$$

and $${\overline{Q}}_{g\mathrm{and}}$$

In case of a deviation of the numerical values are outside the predetermined setpoint ± ΔK _and calculated and stored liquid mass flow (oil-water mixture) and M _zhi free gas volumetric flow rate Q _{plaster Gi} of each well, respectively, by the formulas M _zhi = -M M _{Ms Ms (n- 1)} and Q _gi = Q _gi -Q _{gi (n-1)} , where n is the number of wells in the well; _{Ma (n-1)} and Q _{gu (n-1)} , respectively, the total mass flow rate of the liquid and the total volume flow rate of free gas measured in bypass mode for (n-1) wells. Next, the numerical value of the coefficient is calculated and stored (using the controller) for each well of the oil well cluster $$K_i=\frac{M_{\mathrm{well}i}}{Q_{gi}}$$

, compares the numerical values of the coefficients K _i for each well with the current numerical value of K _and . A well with a changed mass flow rate of oil in an oil well cluster is identified by the minimum difference between the numerical value K _{i of} one of the wells in an oil well cluster and the numerical value of the coefficient K _and .

After a well with the modified mass flow of oil wells bush liquid identified, the numerical value of the coefficient K _i (given well with altered mass flow) and the current numerical value of K _and is taken as predetermined, preserving numerical value tolerance ± ΔK _and.

The proposed method, using the sign of changing the total estimate of the mass flow rate of the liquid in the oil well cluster _and further deviations of the coefficient K _and beyond the specified settings ± ΔK _and , provides the possibility of identifying the well with the changed mass flow rate of the oil well cluster directly in the process of measuring the flow rate of the wells.

Also, continuous measuring and calculating integral consumable indicators liquid-free gas (M _Ms, Q _w) and the coefficient K _{and a} permit program by tracking trends in these parameters, and their mean follow the dynamics of their changes in order to predict (extrapolate) disorders operating mode oil well bush.

Claims (2)

1. A method of identifying a well with a changed mass flow rate of a wellbore fluid of oil wells, which consists in connecting all of the producing wells of a wellbore to an intermediate oil collector and continuous measurement by means of a non-separation flowmeter installed on the intermediate oil collector, for example, multiphase, total flow rate parameters of the wellbore: mass flow rate of liquid (oil-water mixture) and _Ms M volumetric gas flow Q _gi, all production wells connected to the intermediate n ftesbornomu manifold through switch oil wells, with each well retraction production oil well cluster through bypass conduit bypassing besseparatsionnogo flowmeter, characterized in that the continuously computed numerical value of the coefficient $$K_{\mathrm{and}}=\frac{\Delta M_{\mathrm{well}\mathrm{and}}}{\Delta Q_{g\mathrm{and}}}$$

Where _Ms ΔM _w and ΔQ, respectively, difference of the previous and current average numerical values of parameters of total consumable oil wells bush $${\overline{M}}_{\mathrm{well}\mathrm{and}}$$

and $${\overline{Q}}_{g\mathrm{and}}$$

, Compare the calculated values of _{K, and} with it to specify the range of allowable deviation value ± ΔK _and and, in case of deviation to _and from the target values, by alternately switching drain output of each of the wells in the bypass pipe, measured total mass flow rate M _{Ms (n -1)} and total free gas volume flow Q _{gi (n-1)} to (n-1) wells, where n - the total number of wells in the bush, is calculated for each well mass flow rate of liquid (oil-water mixture) M = M _{zhi Ms} - M _(n-1) , volumetric flow rate of free gas Q _gi = Q _gi- q _{gi (n-1)} and coefficient $$K_i=\frac{M_{\mathrm{well}i}}{Q_{gi}}$$

and then compare the numerical values of the coefficients K _i for each well with the current numerical value K _and , and the well with the changed mass flow rate of the liquid in the oil well cluster is identified by the minimum difference between the numerical value K _{i of} one of the wells in the oil well cluster and the numerical value of the coefficient K _and . 2. A method for identifying a well with a changed mass flow rate of a liquid in an oil well cluster according to claim 1, characterized in that during operation of the oil well cluster after each subsequent deviation of the current numerical value K _and beyond its permissible values ± ΔK _and with subsequent identification of i- minutes wells with altered mass flow of liquid, the numerical value of the coefficient K _i (given well with altered mass flow) and the current numerical value of K _and is taken as predetermined, with a wound numerical values ± tolerance _and ΔK.

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