RU2794832C1 - Method of regulating the development of oil fields - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: invention relates to a method for regulating the development of oil fields. A section of the field with hydrodynamically connected wells is taken. The products are taken from producing wells with an analysis of the flow rate. A displacing agent is pumped into injection wells with determination of the outlines of the mutual influence of the wells and the adjustment of the flow rates of the production wells. The flow rates of production wells and the injection of the displacing agent into injection wells are analysed. Permissible deviations of annual oil production in the field are determined. The flow rates of production wells and well operation time are regulated. The volumes are changed and the injection is redistributed into the injection wells until the allowable deviations in the design annual oil production in the field are reached. If the value of tolerances is greater than the actual values, the flow rates of production wells and the operating time are regulated to reduce the inflow. When the value of tolerances is less than the actual values, the operation conditions of the wells is regulated to increase the inflow.

EFFECT: regulation of flow rates of producing wells due to redistribution of injection into injection wells, taking into account the permissible deviations of annual oil production from the accepted design levels for the field.

1 cl, 1 tbl

Description

The invention relates to the oil industry, in particular to methods for regulating the development of an oil deposit, and can be used for automated selection of operating modes of the operating stock of injection and production wells of an oil field flooding system.

There is a known method for regulating an oil deposit (patent RU No. 2521245, IPC E21B 43/20, publ. 27.06.2014, Bull. No. 18), including the allocation of a field site with hydrodynamically connected wells, the selection of production from production wells with analysis by flow rate, injection of a displacing agent into injection wells with determination of the contours of mutual influence of wells and adjustment of flow rates of production wells. According to the invention, the analysis of the flow rates of production wells and the injection of a displacing agent into injection wells is carried out on the basis of the identified relationships with the corresponding production wells in terms of their total production rate during actual operation in selected areas using historical databases and current data during the optimization work with step 1- 3 months By adjusting flow rates from production wells, volumes are changed and injection is redistributed into injection wells, taking into account the mutual influence of the corresponding production and injection wells. In this case, the total injection volume is changed by no more than 10%. Residual reserves are developed using the existing well stock with an increase in the total flow rate of production wells while reducing the water cut of the product or maintaining it at the current level.

The disadvantages of the method are:

- lack of a conclusion on the permissible deviation of annual production from the design annual production level for the field;

- the analysis is carried out during the optimization work with a step of 1-3 months, which does not reflect the work of the wells for the entire reporting year after the optimization work.

A known method for regulating an oil deposit (patent RU No. 2528185, IPC E21B 43/20, publ. 10.09.2014, Bull. No. 25), including the selection of a field site with hydrodynamically connected wells, the selection of production from production wells with analysis by flow rate, injection of a displacing agent into injection wells with determination of the contours of mutual influence of wells and adjustment of flow rates of production wells. According to the invention, the analysis of the flow rates of production wells and the injection of a displacing agent into injection wells is carried out on the basis of the identified relationships between injection wells and the corresponding production wells in terms of their total production rate during actual operation in selected areas using historical databases from one to 20 years with a step of 1- 3 months and current data during the optimization work. Flow rates from production wells are adjusted by changing the volumes and redistributing injection into injection wells, taking into account the mutual influence of the corresponding production and injection wells. In this case, the total injection volume is changed by no more than 10%. The regulation of recovery modes from production wells includes increasing the recovery of production from wells with a persistent or slightly increasing water cut and reducing recovery up to a complete shutdown from wells with rapidly watering production. At the same time, the residual reserves are developed using the existing well stock with an increase in the total production rate and a decrease in the total water cut of the product, and the fluid movement flows are redistributed until the development of residual oil reserves.

The disadvantages of the method are:

- lack of a conclusion on the permissible deviation of annual production from the design annual production level for the field;

- a longer period of analysis up to 20 years, during which changes in existing development conditions are possible;

- comparison of historical databases is carried out with current data for the period of optimization work, which does not include the history of well operation for the entire current year.

The technical objective of the invention is the effective regulation of flow rates of producing wells by redistributing injection into injection wells, taking into account the allowable deviations of annual oil production from the accepted design levels for the field.

The technical problem is solved by a method for regulating the development of oil fields, including the allocation of a field site with hydrodynamically connected wells, the selection of production from production wells with an analysis of the flow rate, the injection of a displacing agent into injection wells with the determination of the contours of the mutual influence of wells and the adjustment of production well flow rates.

What is new is that the analysis of production well flow rates and displacement agent injection into injection wells is carried out based on the identified relationships with the corresponding production wells in terms of their annual production and time of operation in the field using historical monthly production bases and well operation time for the last five years and actual indicators for the current year, determine the allowable deviations of the annual oil production in the field depending on the design annual level of oil production in the field, then regulate the flow rates of production wells, well operation time and change the volumes and redistribute injection into injection wells until the allowable deviations are reached according to the design annual oil production in the field, if the value of tolerances is greater than the actual values, the flow rates of production wells and the operating time are regulated towards reduction in production, if the value of tolerances is less than actual values, the mode of operation of wells is regulated in the direction of increasing production from production wells.

The method is carried out as follows.

A section of the field with hydrodynamically connected wells is selected, production is taken from production wells with an analysis by flow rate, then a displacing agent is injected into injection wells with well interference contours determined and production well production rates adjusted.

Analysis of production well rates and injection of a displacing agent into injection wells is carried out based on the identified relationships with the corresponding production wells in terms of their annual production and time of operation in the field using historical monthly production bases and well operation time for the last five years and actual indicators for the current year , determine the permissible deviations of the annual oil production in the field in accordance with table 1.

Table 1 Design annual level of oil production at the field, million tons Permissible deviation of annual production, % up to 0.01 (inclusive) set according to the level actually achieved more than 0.01 to 0.025 (inclusive) 50.0 more than 0.025 to 0.05 (inclusive) 40.0 more than 0.05 to 0.10 (inclusive) 30.0

Table 1 continued

more than 0.10 to 1.0 (inclusive) 25.0 over 1.0 up to 5.0 (inclusive) 20.0 more than 5.0 to 10.0 (inclusive) 15.0 more than 10.0 to 15.0 (inclusive) 12.0 more than 15.0 to 20.0 (inclusive) 10.0 over 20.0 up to 25.0 (inclusive) 8.5 over 25.0 7.5

Then, production well flow rates, well operation time are regulated, and the volumes are changed and the injection is redistributed to injection wells until the allowable deviations in the design annual oil production for the field are reached, if the tolerance value is greater than the actual values, production well flow rates and operating time are regulated in the direction of reducing the selection, when the value of tolerances is less than the actual values, the mode of operation of the wells is regulated in the direction of increasing the selection from production wells.

An example of a specific implementation of the method.

In the field under consideration, sections of the deposit with wells hydrodynamically interconnected are distinguished. Spend the selection of products from 20 producing wells, then the injection of the displacing agent in 7 injection wells with an injection volume of 10300 m ³ per month. To increase the total oil production rate for 20 wells (actual production rate is 93 t/day) and maintain the water cut to 77%, monitoring of the mutual influence of wells for 5 years on a monthly basis was carried out. As a result of the analysis obtained, we adjust the flow rates from production wells, increasing to 95.7 tons / day due to changes in volumes and redistributing injection into injection wells, taking into account the mutual influence of the corresponding production and injection wells, and the total injection volume is changed by no more than 15%, those. up to 11800 m ³ per month.

At the field under consideration, we allocate 4 sections of wells by water cut with oil production of 135.0 thousand tons per year with an allowable 127.4 thousand tons and a design production of 98 thousand tons. We select products from 49 producing wells. We calculate deviation scenarios for each section.

For 4 sections, we analyze the operating time of wells to reduce production to an acceptable value. We select 22 wells with a water cut of more than 90% and reduce the operating time of each well by 1.2 days. We select 9 wells with a water cut of 50-90% and reduce the operating time of each well by 3.5 days. We select 13 wells with a water cut of 2-20% and reduce the work of each well by 2 hours.

The method for controlling the development of oil fields makes it possible to effectively regulate the flow rates of production wells by redistributing injection into injection wells, taking into account the allowable deviations of annual oil production from the accepted design levels for the field.

Claims (1)

A method for controlling the development of oil fields, including the allocation of a field site with hydrodynamically connected wells, the selection of production from production wells with an analysis by flow rate, the injection of a displacing agent into injection wells with the determination of well interference contours and the adjustment of flow rates of production wells, characterized in that the analysis by the flow rate of production wells wells and the injection of a displacing agent into injection wells is carried out on the basis of the identified relationships with the corresponding production wells in terms of their annual production and operating time in the field using historical monthly production bases and well operating time for the last five years and actual indicators for the current year, allowable deviations are determined annual oil production from the field, depending on the design annual level of oil production from the field, then regulate the flow rates of production wells, well operation time and change the volumes and redistribute injection into injection wells until allowable deviations in the design annual oil production from the field are reached, at the value of allowable deviations greater than the actual values regulate the flow rates of production wells and the operating time in the direction of reducing the selection, if the value of permissible deviations is less than the actual values, the mode of operation of the wells is regulated in the direction of increasing the production from production wells.