The way to control oil and gas production well activated by gas injection

 

The invention relates to the operation of wells and can be used to control oil and gas production well activated by gas injection. The objective of the invention is to prevent failures. The well includes at least one production casing inside the casing, forming together with the casing annular space, United by means of the delivery of gas through a control valve with a source of gas under pressure, equipped with at least one gas inlet valve and connected with the exhaust manifold, equipped with a discharge nozzle with an adjustable opening. When initially closed control valve and an outlet nozzle, the method includes the start-up phase, consisting of early stage oil and gas production and stage of installation operating mode, followed by the operational phase. During the stage of early oil and gas production compared to the pressure at the outlet of the control valve with two pre-defined thresholds and depending on the comparison results open the control valve to discharge the gas in the annular space with a predetermined flow rate, and when dostizheniya a predetermined minimum flow rate of hydrocarbon production. During the installation phase operating mode compare consumption, production of hydrocarbons with a predetermined threshold T1 and, if the flow rate exceeds a specified threshold within a predetermined period of time D1, increase the opening of the nozzle to a predetermined value, and if not, repeat the comparison operation, maintain a predefined time interval for establishing a minimum flow rate of hydrocarbon production, compare the flow rate of hydrocarbon production threshold T2 is greater than T1, and the pressure at the inlet of the nozzle with a predetermined threshold P1 and if the specified flow rate and a specified pressure consistently exceed both the specified threshold for a period of time D1, complete the start-up phase, and if not, repeat the comparison operation. 6 C.p. f-crystals, 3 ill.

The invention concerns a method of controlling oil and gas wells that are activated by injection of gas from a gas source under pressure, while processing the extracted hydrocarbon processing carried out on the installation, located at the outlet of the supply wells.

In the document GB 2252797 described method of controlling the flow rate of oil wells, including in space, when this column is equipped with at least one gas inlet valve communicating with a source of gas under pressure through a control valve to regulate the flow of gas inside the casing, and an exhaust nozzle that allows you to control the flow of hydrocarbons in the production string, the method is to control the control valve and the exhaust nozzle depending on the values of the temperature and pressure measured at the surface and in the annular space, and depending on the values of pressure and gas flow coming from the source.

In document EP 0756065 described control system for feeding hydrocarbons in the exhaust pipe connected with production well activated by gas injection.

This system includes a discharge nozzle for controlling the flow of hydrocarbons in the exhaust manifold and the control module to dynamically control the opening of the exhaust nozzle.

The control module provides dynamic control of the opening of the exhaust nozzle depending on pressure changes in the injection pipeline.

According to a particular variant of implementation of nagnetatelno the pipeline on the basis of measuring the pressure in the specified pipeline, produced by sensors and used as the input signal, and outputs a signal to control the position of the exhaust nozzle.

These method and apparatus do not provide effective control over the production of hydrocarbons in the formation of the gas tube at the time of starting operation well after the opening of the outlet nozzle, as well as in the formation of the liquid tube in the beginning of the ascent rate of the injected gas, in particular at very high pressure discharge gas.

The formation of these tubes causes of failures, in particular cyclic process failures hydrocarbon production, resulting in irregular supply of raw materials to processing facilities at the output well, such as the separator for the separation of gas and liquid, the recompression installation and gas installation.

This irregular supply of raw materials to processing facilities at the output of the well, among other things, is the cause of reducing the amount of gas required for the activation of the wells, and the increasing threat stops the production process, resulting in reduction of production.

Another consequence of these failures is increased to the sand and the need to use expensive equipment to control sand and to frequent and expensive repairs damaged wells.

These methods do not allow for stable and optimal production after start-up phase with minimal gas consumption, effectively compensate for the losses resulting from unforeseen failures in the tank or failure of the columns and equipment to ensure efficient operation of the well when the reduction gas supply.

The technical result of the present invention is to eliminate the above disadvantages. This technical result is achieved by a method of controlling oil and gas wells that are activated by the discharge gas includes at least one production casing inside the casing, forming together with the specified casing annular space, United by means of the delivery of gas through a control valve with a source of gas under pressure, equipped with at least one gas inlet valve and connected with the exhaust manifold, equipped with an outlet nozzle with adjustable opening, according to the invention with closed control valve and the exhaust nozzle includes a start-up phase, consisting of early stage oil and gas production, during which compare the output pressure of Mawlana below the threshold RSN, open the control valve to inject the gas into the annular space at a predetermined flow rate Q1 of the gas supply if the pressure is in the range between the thresholds RSN and RSN, open the control valve to discharge the gas in the annular space with a predetermined flow rate Q2 of the gas supply greater than Q1, and when this pressure reaches the threshold RSN, set the flow rate of the gas flow in the annular space equal to a predetermined value Q3, exceeding Q1; gradually open the nozzle to a predetermined value to achieve a predetermined minimum flow rate of hydrocarbon production and stage of installation operating mode, during which compare the flow rate of hydrocarbon production with a predetermined threshold T1 and, if the flow rate exceeds a specified threshold within a predetermined period of time D1, increase the opening of the nozzle to a predetermined value, and if not, repeat the comparison operation, maintain a predefined time interval for establishing a minimum flow rate of hydrocarbon production, compare the flow rate of hydrocarbon production threshold T2 is greater than T1, and the pressure at the inlet of the nozzle with ZAO both specified threshold for a period of time D1, complete the start-up phase, and if not, repeat the operation.

In accordance with another variant of implementation of the present invention at the stage of installation operating mode during the start-up phase additionally periodically calculate the derivative of the pressure at the outlet of the control valve with respect to time and compare this derivative with a pre-defined negative threshold positive threshold, if the derivative of the pressure below a negative threshold, increase the flow rate of the injected gas to a predetermined value, if the derivative of the pressure exceeds a positive threshold, reduce the flow rate of the injected gas to a predetermined value.

According to another variant of the present invention for the start-up phase should be operational phase, during which compare the consumption of hydrocarbons with four pre-defined thresholds SR1, SR2, SR3 and SR4, and SR2 exceeds SR1, SR4 exceeds SR3, and, if the flow rate of hydrocarbon production below SR1 and if the feeder flow rate of the injected gas is below a predetermined threshold, increase the specified flow rate to a predetermined value, if the flow rate of hydrocarbon production above SR2 and if the flow rate of the feed injection g consumption, production of hydrocarbons below SR3 and if the degree of opening of the outlet nozzle below a predetermined threshold, increase the opening of the specified nozzle to a predetermined value, if the flow rate of hydrocarbon production exceeds SR4 and if the degree of opening of the outlet nozzle above a predetermined threshold, reduce the specified opening of the nozzle to a predetermined value, renew the previous comparison operation, and comparing the flow rate of hydrocarbon production with a predetermined threshold and, if the specified flow rate below a specified threshold, resume the launch phase.

According to another variant of the present invention during the operational phase, in addition, we calculate the derivative of the pressure at the outlet of the control valve with respect to time and compare this derivative with a pre-defined negative threshold positive threshold and, if the derivative of the pressure below a negative threshold, increase the feed rate of the injected gas to a predetermined value, if the derivative of the pressure exceeds a positive threshold, decrease the feed rate of the injected gas to a predetermined value.

According to another variant of the present invention the flow rate of hydrocarbon production is measured by the flow meters installed on the exhaust manifold outlet but on the basis of the pressure difference in the exhaust nozzle and at its opening.

The essence of the present invention more apparent from the following description, given by way of example and the accompanying figures, in which

Fig.1 depicts oil and gas wells that are activated by discharge gas that includes one production casing;

Fig.2 - oil and gas production well activated by discharge gas that includes two casing;

Fig.3 - two oil and gas wells that are activated by the discharge gas, the flow rate of the feed which are regulated by a single control valve.

Basically the method in accordance with the present invention is used for the management of oil and gas wells that are activated by injection of gas from a gas source under pressure, feed processing facilities located at the outlet of the well.

In Fig.1 shows a well for the extraction of hydrocarbons in the form of a mixture of liquid and gas, comprising the following elements:

production casing 2;

casing 3, covering the column 2;

the annular space 4 formed column 2 and casing 3;

source 7 gas under pressure;

many of the intake valves 8 for the inlet of gas in column 2 of kolicevo is Netania gas in the annular space 4, in communication with the source 7 gas through a control valve 6;

the exhaust manifold 23 for removal of extracted hydrocarbons, connecting the upper part of the column 2 with processing units 14 at the output of the well through the discharge nozzle 9 with adjustable opening;

the sensor 10 to measure the temperature at the inlet nozzle 9 that outputs an electronic signal corresponding to the value specified temperature;

the sensor 11 of the pressure at the inlet nozzle 9, the issuing electronic signal corresponding to the value of the specified pressure;

the pressure sensor 12 at the outlet of the control valve 6 that outputs an electronic signal corresponding to the value specified pressure;

the sensor 13 of the flow rate of the injected gas, installed at the inlet of the control valve 6 and outputs the electronic signal corresponding to the value of the specified flow;

programmable machine 21, is equipped with input elements 17, 18, 19 and 20, the receiving electronic signals from the sensors 11, 10, 13 and 12, and output elements 15 and 16 that outputs signals respectively control the exhaust nozzle 9 and a control valve 6;

operator console 22 to enter data into the machine 21.

In addition, the machine 21 includes not shown in Fig.1 is her well, namely pre-defined values of the adjustment variables. The data previously entered by the operator from the remote control 22 and can be changed during the production process using the same remote.

Some of these data can be entered auxiliary control computer, not shown in Fig.1.

Machine 21 provides automatic regulation of the flow rate of the injected gas, measured by the sensor 13, within a specified value, predetermined in accordance with the control program, with the values of the variables of the adjustment values, and depending on the signals issued by the sensors 10, 11, 12 and 13, powering the control valve 6.

To actuate the device pumping of hydrocarbons of the exhaust nozzle 9 and the control valve 6 are closed.

The method in accordance with the present invention includes the start-up phase of the pumping device of hydrocarbons, consisting of two stages. The first stage is the stage of the beginning of oil and gas production, during which the machine 21 compares the output pressure of the control valve 6, as measured by the sensor 12, with two thresholds RSN and RSN previously defined taking into account the technical is cnica 7 gas.

If this pressure is below the threshold RSN, this means that the pressure in the annular space 4 is of such a value that may cause damage to the gas inlet valve 8. To eliminate this danger it is necessary to gradually increase the pressure in the annular space 4.

For this machine 21 via the output element 15 outputs a signal of opening of the control valve 6 to bring the flow rate of the injected gas to the values of Q1, a pre-determined depending on the volume of the annular space 4, for example 2% of the flow rate of the injected gas, which is designed for the dimensions of the well.

If this pressure is in the range between the thresholds RSN and RSN, this means that the pressure is not sufficient to start the discharge through the valve 8. In this case, the machine 21 via the output element 15 outputs a signal of opening of the control valve 6, to provide a flow rate Q2 of the pressurizing gas in excess of Q1 and pre-determined depending on the capacity of the source 7 gas, for example 10% of consumption, which is designed for the dimensions of the well.

When this pressure reaches the threshold RSN, machine 21 via the output element 15 outputs a signal of opening of the control valve 6, to ensure that the flow rate Q3 of the pressurizing gas in excess of Q1 is a matter of the size of the hole.

After that, the machine gradually opens the nozzle 9 to a predetermined value to achieve a predetermined minimum flow rate of hydrocarbon production, for example 25% of consumption, which is designed for the dimensions of the well.

Thus ends early stage oil and gas production, and the start-up phase continues stage of installation operating mode, during which the machine performs the following operations.

It calculates the flow rate of hydrocarbon production, taking into account their temperature generated by the sensor 10, by the formula

where Q is the design flow of hydrocarbon production,

Qo, and- fixed parameters of the well,

T - temperature of hydrocarbons in the pipe 23, as measured by the sensor 10.

He then compares the calculated consumption of hydrocarbons with a predetermined threshold T1, corresponding to the minimum flow rate, for example 25% of consumption, which is designed for the dimensions of the well.

If the design flow of hydrocarbon production exceeds the threshold T1 for a predetermined period of time D1, for example 20 minutes, the machine via the output element 16 outputs a signal of the opening of the nozzle 9 to advance certainly is a function of the comparison.

When the flow rate of hydrocarbon production has been stabilized, after the expiration of a predetermined period of time corresponding to the flush time of the production string, for example 60 minutes, the machine 21 compares the flow rate of hydrocarbon production, calculated on the basis of temperature measurements at the inlet nozzle 9, the threshold T2 is greater than T1, is equal to, for example, 50% of the total production, which is designed well.

He then compares the flow rate of hydrocarbon production, calculated on the basis of the temperature measurement sensor 10, with the threshold T2, and the pressure at the inlet nozzle 9 with a predetermined threshold P1.

If the design flow of hydrocarbons is greater than the threshold T2, and the pressure at the inlet nozzle 9 exceeds the threshold P1 within a predetermined period of time, for example 20 minutes, the machine 21 performs operational phase.

If these two conditions are not met, the machine 21 resumes the early stage oil and gas production.

In addition, he periodically calculates with respect to the time derivative of the pressure at the outlet of the control valve 6 and compares it with a predetermined negative threshold dPC1 and with a predetermined positive parahaemolyticus limit the fall of the annular pressure in order to prevent premature closing of the inlet gas valve 8 in the upper part of the casing 2 and to the annular pressure was not sufficient to ensure the discharge of gas through the valve 8 in the upper part of the column 2, the machine 21 increases the flow rate of the injected gas to a predetermined value by increasing the setpoint for automatic regulation of the flow rate, which is expressed in the opening signal of the control valve 6, sent by the machine 21 via the output element 15.

The start-up phase is terminated. The method in accordance with the present invention also includes the operational phase, during which the machine 21 calculates the flow rate of hydrocarbon production, as described above, on the basis of temperature measurements at the inlet nozzle 9, and then compares it with four thresholds SR1, SR2, SR3 and SR4, pre-defined depending on consumption, which is designed well, for example in % of flow: SR1=75%, SR2=90%, SR3=85%, SR4=100%.

If the design flow of hydrocarbons below SR1 and if the flow rate of the injected gas below the threshold QGS, a pre-determined depending on the technical parameters of a well, for example 60% of the maximum supplies is definitely an amount for example 30% of the maximum gas flow, which is designed for the dimensions of the well, by changing the set values for the automatic regulation of the flow.

If the design flow of hydrocarbons below SR2 and if the flow rate of the injected gas below the threshold QGI, a pre-determined depending on the technical parameters of the well and its equipment, for example 10% of the maximum gas flow, which is designed for the hole size, the machine 21 reduces the flow rate of the injected gas to a predetermined value, for example 2% of the maximum gas flow, which is designed for the dimensions of the well, by changing the set values for the automatic regulation of the flow.

If the design flow of hydrocarbons below SR3 and if the opening of the nozzle 9 is below the threshold, a predetermined depending on the technical parameters of the well and its equipment, for example, 100% of the maximum opening of the nozzle 9, the machine 21 increases the opening of the nozzle to a predetermined value, for example 3% of the maximum opening.

If the design flow of hydrocarbon production exceeds SR4 and if the opening of the nozzle 9 is greater than the threshold, a predefined depending on the technical parameters of a well is it a certain value, for example 3% of the maximum opening.

At the same time the machine 21 compares the calculated flow rate of hydrocarbon production from certain before this threshold T1, and if this consumption is below T1, the machine resumes the start-up phase.

Due to the combined effect on the discharge nozzle and to control the gas-injection valve according to the method in accordance with the present invention, the first gas tube and the first liquid tube are eliminated and production of hydrocarbons is stabilized by a stable and minimum discharge gas in the production casing.

The above-described method of controlling oil and gas wells is not limited to the management of this type of wells, it can also be used to make some constructive changes that are available for professionals, to control the other of the following types of wells:

type well with a “double set” shown in Fig.2, in which one barrel 3 casing has two production string 32 and 33 and applied two exhaust nozzles 34 and 35 for removal of extracted hydrocarbons, as an example we can mention that the gas flow rate is regulated by the control valve 6, is the sum of the costs is syshestvyut until while consumption production other columns will not exceed a predefined threshold;

type bore with an axial discharge gas, wherein the activation gas is pumped through a pipeline that is installed inside the casing;

the type of well with United gas supply”, in which the gas is blown in two wells 40 and 41 total gas-injection pipe.

Claims

1. The way to manage oil and gas wells that are activated by the discharge gas includes at least one production casing inside the casing, forming together with the casing annular space, United by means of the delivery of gas through a control valve with a source of gas under pressure, equipped with at least one gas inlet valve and connected with the exhaust manifold, equipped with an outlet nozzle with adjustable opening, wherein at the closed control valve and the exhaust nozzle includes a start-up phase, consisting of early stage oil and gas production, during which compare the output pressure of the control valve with two pre-defined ports discharge gas in the annular space at a predetermined flow rate Q1 of the gas supply, if this pressure is in the range between the thresholds RSN and RSN, open the control valve to discharge the gas in the annular space with a predetermined flow rate Q2 of the gas supply greater than Q1, and when this pressure reaches the threshold RSN, set the flow rate of the gas flow in the annular space equal to a predetermined value Q3, exceeding Q1, gradually open the discharge nozzle to a predetermined value to achieve a predetermined minimum flow rate of hydrocarbon production, and stage of installation operating mode, during which compare the flow rate of hydrocarbon production with a predetermined threshold T1, and if the flow rate exceeds a specified threshold within a predetermined period of time D1, increase the opening of the exhaust nozzle to a predetermined value, and if not, repeat the comparison operation, maintain a predefined time interval for establishing a minimum flow rate of hydrocarbon production, compare the flow rate of hydrocarbon production threshold T2 is greater than T1, and the pressure at the inlet of the exhaust nozzle with a predetermined threshold P1 and, if the specified flow rate and a specified pressure steadily preventorium the comparison operation.

2. The method according to p. 1, characterized in that during the stage of installation operating mode, periodically calculate the derivative of the pressure at the outlet of the control valve with respect to time and compare this derivative with a pre-defined negative threshold positive threshold, if the derivative of the pressure exceeds a positive threshold, reduce the flow rate of the injected gas to a predetermined value.

3. The method according to p. 1 or 2, characterized in that the start-up phase should be operational phase, during which simultaneously compare the consumption of hydrocarbons with four pre-defined thresholds SR1, SR2, SR3 and SR4, and SR2 exceeds SR1, SR4 exceeds SR3 and, if the flow rate of hydrocarbon production below SR1 and if the feeder flow rate of the injected gas is below a predetermined threshold, increase the specified flow rate to a predetermined value, if the flow rate of hydrocarbon production exceeds SR2 and if the feeder flow rate of the injected gas exceeds a pre-defined threshold, reduce the specified flow rate to a predetermined value, if the flow rate of hydrocarbon production below SR3 and if the degree of opening of the outlet nozzle below a predetermined threshold, took the than SR4 and if the degree of opening of the outlet nozzle above a predetermined threshold, reduce the opening of the specified nozzle to a predetermined value, renew the previous comparison operation, and comparing the flow rate of hydrocarbon production with a predetermined threshold and, if the specified flow rate below a specified threshold, resume the launch phase.

4. The method according to p. 3, characterized in that during the operational phase additionally periodically calculate the derivative of the pressure at the outlet of the control valve with respect to time and compare this derivative with a pre-defined negative threshold positive threshold and, if the derivative of the pressure below a negative threshold, increase the feed rate of the injected gas to a predetermined value, if the derivative of the pressure exceeds a positive threshold, decrease the feed rate of the injected gas to a predetermined value.

5. The method according to p. 1 or 3, characterized in that the flow rate of hydrocarbon production is measured by the flow meters installed on the exhaust manifold at the inlet of the exhaust nozzle.

6. The method according to p. 1 or 3, characterized in that the flow rate of hydrocarbon production calculated on the basis of the temperature measurement of the extracted hydrocarbons at the inlet of the exhaust nozzle.

7. The way p the exhaust nozzle and the opening of the specified nozzle.

 

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