RU2548460C1 - Control method for production and actions system at wells cluster - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: method provides for use of the production wells. One or several wells are equipped with pump unit with possibility of discharge change. For each production well the deposit or deposits used for production are known. At wellhead of each production well the produced crude oil and oil gas are measured, as well as crude oil watercut is determined. The product wells product is delivered to the gathering header of the wells cluster. The cluster contains one or more injection wells. For each injection well the deposit or deposits used for injection are known. Injectability of the injected water and required injection pressure are determined. Compatibility of the injected water and produced water is studied. Injection is performed upon compatibility of the injected and produced waters. Coordinates of all production and injection wells of the cluster using the same deposits are determined. For each production well time of the produced product lifting is determined from suction of the pump unit to wellhead at maximum discharge. Volume of produced crude oil and oil gas is measured with interval not exceeding half of measured time of fluid lifting for the given well. At wellhead of each well the injected water pressure and its volume are measured. Injected water volume and wellhead pressure are measured with interval not exceeding half of measured time of water supply to the wellhead of each injection well before parker. For each injection well the curve of injected water pressure and volume vs. time is plotted. For each production well using the plotted volume of produced crude oil and oil gas vs. time the relationship with the injected water volume and wellhead pressure is determined, as well as distances to each injection well ensuring injection to the same deposit. For the production wells equipped with pump units with possibility of discharge change such relationships are determined at different discharge. The wells cluster is controlled based on the obtained relationships for all production wells. At that the treated water supply system for injection is made with possibility to change water volume and wellhead pressure for one or more injection wells.

EFFECT: increased efficiency of clusters well control.

2 cl, 1 dwg

Description

The claimed invention relates to the field of oil production and can be used in systems for the extraction and collection of oil and gas in the development of oil fields, especially in the late stages of development, when the production of oil wells is characterized by high water cut.

A known method of controlling a system of selections and impacts on a wellbore containing production wells, among which one or more is equipped with a pumping unit with a frequency-controlled power supply of an electric motor in which the parameters of the production process are controlled, is carried out on the basis of control data geological and technical measures aimed at impact on the reservoir to increase the flow of fluid, and the impact on the reservoir is performed during production by varying the parameters of geological and technical measures the process of production and continuous monitoring of these parameters, including in automatic mode, as the parameters of the production process, the most significant ones for increasing the inflow are selected: pressure of the borehole fluid, temperature, humidity and density of the fluid, which are fixed with the dynamics of changes in these parameters depending on the speed electric motor, while the above parameters of the production process and the amount of fluid flow are adjusted through the control unit to maintain optimal values by varying the frequency of rotation electric motor, the time of completion of geological and technical measures is determined by the moment of optimization of the parameters of the production process and the amount of fluid inflow, and for the possibility of impact of the parameters of the production process on the formation, the supply system and the suction system of the production pump are looped with the lower and upper holes in the tubing string and separated from the formation zone by the packer / RF Patent No. 2188934, E21B 43/12, E21B 47/06, publ.: 09/10/2002 /.

The disadvantage of this method is the lack of efficiency in the operation of wells with installations of electric centrifugal pumps (ESP), since the electric centrifugal pump by its oscillations introduces errors in the readings of sensors of controlled parameters cluttering the same section of perforation; setting the well to maximum inflow from the reservoir (not matching the optimal inflow according to the geological conditions of the reservoir) will lead to the absorption of fluid from the dynamic level of the pump and, accordingly, to its emergency stop; the method is complicated due to the large number of controlled parameters and is not sufficiently reliable on high-temperature formations due to the microcircuit of sensors operating at a temperature not exceeding 90 ° C. A systematic, but not constant, and therefore difficult to take into account, error of parameter control is made by the absence of degassing of the liquid, the parameters of which are controlled by the prototype.

A known method of controlling a system of withdrawals and impacts on a wellbore, comprising producing wells, among which one or more is equipped with a pumping unit with a frequency-controlled electric motor, at the output of each producing well, the amount of produced crude oil and gas, as well as the water content of crude oil, production of production wells is sent to the oil field collection system, including starting the pump and changing the frequency of the supply voltage of the electric motor, depending from the water content of the liquid produced by the well, characterized in that the electric centrifugal pump lowered on the tubing (tubing) is run at the minimum frequency of the supply voltage and, accordingly, at the minimum supply, liquid is expected to receive the receiving device on the surface, where its water content is measured , increase the frequency of the supply voltage and measure the current water cut of the incoming liquid, compare the obtained value of the current water cut with water cut at m minimum supply, if the obtained value of the current water cut is greater than or equal to the water cut at a minimum supply, then continue to increase the frequency of the supply voltage until the value of the current water cut is less than the water cut at the minimum supply, in the latter case, they begin to reduce the frequency of the supply voltage until until the current water cut is greater than or equal to the water cut with a minimum flow; if the values of the current water cut obtained with an increased feed are less than the water cut at the minimum supply, then they begin to reduce the frequency of the supply voltage until the current water cut becomes greater than or equal to the water cut at the minimum supply / RF Patent No. 2421605, IPC E21B 43/12 ( publ.: 06/20/2011).

The disadvantage of this method is the lack of efficiency, since the control does not take into account the amount of water injected into the injection well and its pressure at the wellhead, the effect of the water injected into the formation on the production of crude oil and oil gas from this formation is not fully taken into account.

Closest to the claimed combination of essential features claimed is a method of controlling a selection and impact system on a wellbore comprising production wells, among which one or more is equipped with a pumping unit with the ability to change the flow, each production well has a formation or reservoirs from which production is carried out, for the mouth of each production well is measured the amount of crude oil and gas extracted, as well as the water content of crude oil, the production of production wells is sent to the collection a wellbore torus, a wellbore contains one or more injection wells, each injection well has a formation or reservoirs into which injection is carried out, injected water injection rate and required injection pressure, the compatibility of the injected water with the produced water is investigated, the injection is carried out with the compatibility of the injected and reservoir water, the bush contains a system for supplying prepared water for injection / Technology of cluster discharge and disposal of associated produced water. / V.F. Shayakberov, R.V. Miroshnichenko [et al.] // Equipment and technologies for the oil and gas complex. - M., 2013. - No. 1. - S. 55-58 /.

The prototype method is not effective enough, since the control does not take into account the amount of water injected into each injection well and its pressure at the wellhead, the effect of the water injected into the reservoir on the production of crude oil and oil gas from this reservoir is not fully taken into account.

The problem to be solved and the expected technical result are to increase the efficiency of the method of controlling the selection system and the effects on the wellbore.

The problem is solved in that in the method of controlling the system of withdrawals and impacts on the wellbore containing production wells, among which one or more are equipped with a pumping unit with the ability to change the flow, at each production well the formation or reservoirs from which production is carried out is known each production well, the amount of produced crude oil and gas is measured, as well as the water cut of crude oil, the production of production wells is sent to the collection header of the wellbore, the bush contains um one or more injection wells, at each injection well there is a formation or reservoirs into which injection is carried out, injection rate for the injected water and the required injection pressure, the compatibility of the injected water with the produced water is investigated, the injection is carried out with the compatibility of the injected and produced water, the bush contains a system the supply of prepared water for injection, according to the invention, the coordinates of all production and injection wells of the bush are determined, the distances between the production and injection are found With each well producing and injecting from the same reservoirs, for each producing well, the time of raising the well production from the intake of the pumping unit to the wellhead is measured at maximum flow, the quantities of crude oil and gas and the water cut of the crude oil are measured with a frequency of not more than half of the measured time of fluid rise for a given well; for each producing well, the change in the quantities of crude oil and gas produced in time is restored , the pressure of the injected water and its quantity are measured at the mouth of each injection well, the time from the flow of water at the mouth of each injection well to the packer is found, the amount of injected water and pressure at the mouth is measured with a frequency of not more than half of the measured time of water intake at the mouth of each the injection well to the packer, for each injection well, the change in the amount of injected water and its pressure at the wellhead is restored over time, for each production well According to the reconstructed time changes in the quantities of crude oil and gas produced, the dependence is determined on the amount of water injected and the pressure at the wellhead, as well as the distance for each injection well that injects into the same reservoir, for production wells equipped with pumping units with the ability to change the flow , such dependencies are determined at different feeds, based on the obtained dependencies for all producing wells, a well cluster is controlled. In addition, in some cases, in a method of controlling a system of withdrawals and impacts on a wellbore, a system for supplying prepared water for injection can be configured to vary the amount of water supplied and the pressure at the wellhead for one or more injection wells.

The ability to change the supply of the pumping unit of the producing well can be provided by changing the frequency of the supply voltage of the ESPN electric motor using a frequency-controlled drive, the frequency of the swing of the rocking machine or the stroke of the plunger of the sucker rod pump.

Depending on the internal structure of the injection well, instead of the time from the flow of water at the mouth of each injection well to the packer, another may be chosen, for example, the time of filling the borehole in the perforation zone with water.

Water can be supplied to the prepared water supply system for injection from oil treatment workshops, preliminary water discharge installations, water wells, as well as lakes and rivers / Technology of preliminary cluster water discharge using decommissioned wells. / V.F. Shayakberov, I.A. Latypov [et al.]. // Scientific and Technical Bulletin of Rosneft Oil Company OJSC. - M., 2011. - No. 3. - S. 36-37. /.

The determination of the coordinates of all producing and injection wells in the cluster allows us to clarify the interaction between the production of crude oil and oil gas and the injection of water into the reservoir, which ensures increased efficiency.

Finding the distances between production and injection, respectively producing and injecting from the same reservoirs, allows us to clarify the interaction between the production of crude oil and oil gas and the injection of water into the reservoir, which provides increased efficiency.

The well-known Kotelnikov – Nyquist – Whittaker – Shannon theorem, or simply the sampling theorem, which is considered one of the most important results of information theory, has a fairly simple formulation: if an analog signal does not contain frequencies higher than F _max in its spectrum, then it can be ideally accurately recover from discrete samples taken with a frequency strictly greater than 2 * F _max .

Measurement for each producing well of the time for raising the well’s production from the intake of the pumping unit to the wellhead at the maximum flow rate allows determining the highest frequency for this well, which ensures an increase in efficiency.

Production in each production well of measurements of the quantities of produced crude oil and oil gas and water cut of crude oil with a frequency of not more than half of the measured liquid lifting time for a given well allows for discrete readings taken strictly at a frequency strictly exceeding the double highest frequency, which ensures increase in efficiency / Installations for measuring the amount of oil and gas for wells and their clusters / V.F. Shayakberov // Measuring equipment. M .: IPK Publishing house of standards. 2011. No. 11. S.26-30. Test units for measurements of the quantity of petroleum and petroleum gas for wells and well clusters / V.F. Shayakberov // Measurement Technique. USA: 2012. Vol. 54. No. 11. February Pp. 1249-1255./.

Quick and accurate determination of water cut of crude oil is carried out using a pipe measuring unit / RF Patent No. 2342528 IPC E21B 47/10, E21B 43/38; publ. 12/27/2008. The error in the calculation of water cut when using a pipe installation for measuring the amount of crude oil and gas / V.F. Shayakberov // Measuring equipment. 2013. No2. S.25-26. Error in calculation of degree of flooding with the use of a pipe device for mearsurements of the quantity of crude oil and gas / V.F. Shayakberov // Measurent Technique. USA: 2013. Vol. 56. No. 2. P.146-148./.

The restoration of ideally accurate discrete readings according to the Kotelnikov-Nyquist-Wittaker-Shannon theorem for each producing well changes in the quantities of crude oil and gas and the water cut of crude oil over time can improve efficiency.

Measurement at the mouth of each injection well of the pressure of the injected water and its amount allows you to determine the amount of water injected into each layer of water, which ensures increased efficiency.

Finding the time from the flow of water at the mouth of each injection well to the packer allows you to determine the highest frequency for this well, which provides increased efficiency.

Measurements of the amount of injected water and pressure at the wellhead are carried out with a frequency of not more than half of the measured time of water supply at the mouth of each injection well to the packer allows for discrete readings taken strictly at a frequency strictly higher than the double highest frequency, which ensures increased efficiency.

The restoration of ideally accurate discrete readings according to the Kotelnikov-Nyquist-Wittaker-Shannon theorem for each injection well of a change in the amount of injected water and its pressure on the wellhead over time can increase efficiency.

The determination for each production well from the reconstructed time changes of the quantities of crude oil and gas produced, depending on the amount of water injected and the pressure at the wellhead, as well as the distance for each injection well that injects into the same reservoir, can increase efficiency.

The determination of such dependencies at different feeds for producing wells equipped with pumping units with the possibility of changing the feed allows to increase efficiency.

Well cluster management based on the obtained dependences for all producing wells allows increasing efficiency due to more accurate consideration of the mutual influence of crude oil and oil gas production and water injection.

The implementation of the prepared water supply system for injection with the possibility of changing the amount of water supplied and the pressure at the wellhead for one or more injection wells allows for more accurate consideration of the mutual influence of crude oil and oil gas production and water injection, which ensures increased efficiency.

The implementation of the prepared water supply system for injection with the possibility of changing the amount of water supplied and the pressure at the wellhead for one or more injection wells is possible when the water pressure sufficient for injection into the reservoir is created by a device for generating water pressure. As a device for creating water pressure, you can use, for example, a pump-changer, a horizontal pumping unit or pit with ESP. Changes in the water supply in the pressure generating devices are provided, for example, by changing the frequency of the electric motor by a frequency-controlled drive, by changing the hydraulic resistance, by directing part of the water to other injection wells or a water conduit.

The inventive method of controlling the system of selections and impacts on the wellbore is carried out by the following sequence of operations:

1) the allocation contained in the bush producing wells;

2) compilation of a list of pumping units, among which one or more must have the ability to change the flow (for ESPs it is provided with a variable frequency drive; for sucker rod pumps - a change in the oscillation frequency of the pumping unit or the plunger stroke);

3) the definition for each producing well of the formation or formations from which production is conducted (according to the passport of the well);

4) measuring at the mouth of each producing well the quantities of crude oil and gas, as well as the water content of crude oil;

5) the direction of production of producing wells in the prefabricated reservoir of the wellbore;

6) the allocation contained in the bush injection wells;

7) determination for each injection well of the formation or formations into which it is injected (according to the passport of the well);

8) measurement of injectivity for injected water and the required injection pressure for each injection well;

9) a study of the compatibility of injected water with produced water;

10) the implementation of the injection with the compatibility of the injected and produced water from the supply system of prepared water for injection;

11) determination of the coordinates of all producing and injection wells of the bush;

12) finding the distances between the producing and injection wells of the bush, respectively producing and injecting from the same formations;

13) measuring for each producing well the time of raising the well products from the intake of the pump unit to the wellhead at maximum flow;

14) production of measurements of the quantities of crude oil and gas and the water cut of crude oil with a frequency of not more than half of the measured time of liquid rise for a given well;

15) restoration for each producing well of changes in the quantities of crude oil and gas produced with changes in water cut over time;

16) measurement at the mouth of each injection well of the pressure of the injected water and its quantity;

17) finding the time from the flow of water at the mouth of each injection well to the packer (the option is considered when the water entering the injection well moves in it along the tubing string and passes through it through the packer, below the packer the water occupies the entire string);

18) measurements of the quantities of injected water and pressure at the wellhead with a frequency of not more than half of the measured time of water intake at the mouth of each injection well to the packer;

19) restoration for each injection well of a change in the amount of injected water and its pressure at the wellhead over time;

20) determination for each production well from the reconstructed changes in time of the quantities of crude oil and gas produced, depending on the amount of water injected and the pressure on the wellhead, as well as the distance for each injection well that injects into the same reservoir;

21) the definition for production wells equipped with pumping units with the ability to change the flow, such dependencies at different feeds;

22) management based on the obtained dependencies for all producing wells by a wellbore;

23) in addition, control is performed taking into account changes in the amount of water supplied and the pressure at the wellhead for one or more injection wells in cases where the system for supplying prepared water for injection is configured to change the amount of water supplied and pressure at the wellhead for one or more injection wells.

Example

One possible embodiment of a device for implementing the inventive method of controlling a system of selections and impacts on a well cluster is shown in the drawing.

The bush includes production wells with pumping units 1 and 2 and an injection well 3, which respectively produce and inject into formation 4. Production wells 1 and 2 with nozzles 5 and 6 are connected to a collecting manifold 7. The supply of the producing well with pumping unit 1 is controlled by a change device feed 8. The quantities of crude oil and gas, as well as the water cut of crude oil from producing wells 1 and 2 are measured by measuring devices 9 and 10, respectively. Injection well 3, injection water enters from conduit 11 through pipe 12. The amount of water injected and its pressure at the mouth of injection well 3 are measured by a water meter 13. The metering devices 9, 10, and 13 with a control device 14 have feedback from the feed change device 8.

A device for implementing the inventive method of controlling a system of selections and impacts on a wellbore works as follows. The coordinates determine the distance on the surface between the injection well 3 and production wells with pumping units 1 and 2. Into the injection well 3 from the water conduit 11 through the pipe 12, water is injected into the formation 4. The amount of water injected and its pressure are measured by a metering device 13, from which the information received is sent to the control device 14. Production wells with pumping units 1 and 2 carry out production from the reservoir 4. Downhole products through pipes 5 and 6 enter the collection manifold 7. Quantity of your extracted crude oil and gas, as well as the water cut of crude oil, are measured by measuring devices 9 and 10, from which information enters the control device 14. The frequency of measurements by measuring devices 9, 10 and 13 is set by the control device 14 so that Kotelnikov-Nyquist theorem can be used -Wittaker-Shannon. At the same time, on a production well with a pumping unit 1, at different feeds that can be changed using the feed change device 8, the water cut is measured. In the control device 14, for producing wells with pumping units 1 and 2, the changes in the quantities of extracted crude oil and oil gas are reconstructed over time, and for the injection well 3, the changes in the amount of injected water and its pressure over time are restored. Then, for production wells with pumping units 1 and 2, the time dependences of the quantities of crude oil and gas produced are determined from the reconstructed changes in the amount of injected water and pressure, as well as the distance to injection well 3. For a production well with pumping unit 1, the dependencies are determined for different feeds. Based on the obtained dependencies for producing wells with pumping units 1 and 2, the well cluster is controlled for the purpose, for example, of optimal crude oil production.

Thus, the claimed method of controlling the system of withdrawals and impacts on the wellbore is more efficient than the prototype due to real-time regulation of production of wells and water injection with constant consideration of changing operating conditions.

Claims (2)

1. A method of controlling a system of withdrawals and impacts on a wellbore, comprising producing wells, among which one or more is equipped with a pumping unit with the ability to change the flow, each producing well has a known formation or formations from which production is conducted, the number is measured at the mouth of each producing well extracted crude oil and oil gas, as well as water cut of crude oil, production of producing wells is sent to the prefabricated reservoir of the wellbore, the bush contains one or more injection wells, Each injection well is known for the formation or formations into which injection is carried out, injectivity for injected water and the required injection pressure, the compatibility of the injected water with the produced water is investigated, the injection is carried out with the compatibility of the injected and produced water, the bush contains a system for supplying prepared water for injection, characterized in that determine the coordinates of all producing and injection wells of the bush, find the distance between the producing and injection wells, respectively producing and for pumping from one formation, for each producing well, measure the time of raising the well products from receiving the pump unit to the wellhead at maximum flow, measuring the amount of crude oil and gas produced with a frequency of no more than half the measured time of lifting the fluid for a given well, for each production well restore the change in the amount of crude oil and gas in time, the pressure of the injected water and its quantity are measured at the mouth of each injection well We determine the time from the flow of water at the mouth of each injection well to the packer, the amount of injected water and the pressure at the well are measured with a frequency of not more than half of the measured time of water flow at the mouth of each injection well to the packer, for each injection well, the quantity change is restored the injected water and its pressure at the wellhead over time, for each producing well according to the reconstructed changes in time of the amount of crude oil and petroleum gas produced they determine the dependence on the amount of water injected and the pressure at the wellhead, as well as the distance for each injection well for injection into the same reservoir, for production wells equipped with pumping units with the ability to change the flow, these dependencies are determined at different flows, based on the obtained dependencies for all producing wells control the well cluster. 2. The method according to claim 1, characterized in that the prepared water supply system for injection is configured to change the amount of water supplied and the pressure at the wellhead for one or more injection wells.

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