CN-122014183-A - Polymer polymer flooding monitoring system for three types of oil layers in water-containing lift-back period

CN122014183ACN 122014183 ACN122014183 ACN 122014183ACN-122014183-A

Abstract

The invention relates to the technical field of energy-saving reconstruction of equipment, in particular to a polymer flooding monitoring system for three types of oil layers in a water-containing lift period. The system comprises an adjustment system switching judging module, an injection well energy-saving optimizing module and an injection well optimizing module, wherein the adjustment system switching judging module is used for continuously monitoring the oil production increment and the electricity consumption of an injection pump to calculate an injection efficiency index during the injection of a first adjustment system so as to judge whether to switch an adjustment system of an injection well at the current moment, the injection well energy-saving optimizing module is used for dividing the well into two types according to an injection pressure space after the system switching condition is met, for an adjustable parameter well, a layered injection allocation scheme is formulated by calculating the interval energy consumption weight and combining with the thickness of an oil layer so as to realize energy saving, for a parameter-adjusting limited well, fracturing resistance reduction is implemented on a communicated produced well, and collaborative optimization is realized through injection and production linkage. According to the embodiment, the polymer flooding decision is optimized by quantifying the energy consumption, and the energy conservation and consumption reduction are realized on the premise of guaranteeing the oil displacement effect.

Inventors

YANG WEIHUA
SHI LEI
SU SHANGHAI
YANG XUEWEI
ZUO LINA
XU RAN
PANG SIMING
CHEN JING
BAI YUGUO
YANG LIU

Assignees

大庆油田有限责任公司
中国石油天然气股份有限公司

Dates

Publication Date: 20260512
Application Date: 20260130

Claims (10)

1. A polymer flooding monitoring system for three types of reservoir water lift phases, the system comprising: The system comprises an adjustment system switching judging module, a system switching judging module and a system switching judging module, wherein the adjustment system switching judging module is used for measuring the difference of average oil production of all production wells in each preset period compared with preset reference oil production and the power consumption of an injection pump in the injection well when all injection wells are injected with a preset first adjustment system, and evaluating the injection efficiency index in each period; The energy-saving optimization module of the injection well is used for counting the injection pressure space of all injection wells when the switching condition is reached so as to divide all injection wells into adjustable parameter wells and parameter adjustment limited wells, injecting a preset second adjustment system into all adjustable parameter wells, counting the injection pressure and injection flow of each layer section in each adjustable parameter well so as to determine the energy consumption weight of each layer section in each adjustable parameter well, counting the effective thickness of each layer section in each adjustable parameter well based on the energy consumption weight, and planning the distribution injection quantity range of each layer section in each adjustable parameter well; and aiming at the parameter-regulating limited well, counting the jet-open thickness of the production wells communicated with all the parameter-regulating limited wells to formulate a fracturing scheme of the production well for carrying out cooperative optimization on the parameter-regulating limited well.
2. The polymer flooding monitoring system of claim 1, wherein the injection efficiency index of each period is a result of a difference between an average oil production of each period and a preset reference oil production and a total power consumption of all injection pumps in all injection wells.
3. The polymer flooding monitoring system for a water lift phase of three types of oil reservoirs according to claim 1, wherein the determining whether to switch the adjustment system of the injection well at the current time comprises: if the injection efficiency index continuously decreases for a preset number of periods before the current moment and is smaller than the preset threshold value, switching the adjustment system of the injection well at the current moment, otherwise, not switching the adjustment system of the injection well at the current moment.
4. A polymer flooding monitoring system for a water lift phase of a three-type reservoir according to claim 3 and wherein said predetermined threshold is a predetermined number times the initial peak value of the injection efficiency index after injection of a predetermined first conditioning system into the injection well.
5. A polymer flooding monitoring system for a water lift phase of three reservoirs according to claim 1 and wherein said dividing all injection wells into adjustable and adjustable limited wells comprises: among all the injection wells, the injection well with the injection pressure space larger than the preset pressure space threshold is marked as an adjustable parameter well, and all the remaining injection wells are marked as parameter adjustment limited wells.
6. The polymer flooding monitoring system for the water lift phase of three types of oil reservoirs according to claim 1, wherein the energy consumption weight of each interval in each adjustable parameter well is a normalized value of the multiplication result of the injection pressure and the injection flow of each interval.
7. The polymer flooding monitoring system for the water lift phase of three types of oil reservoirs according to claim 1, wherein the planning method of the injection allocation range of each layer section in each adjustable parameter well is as follows: Comparing the energy consumption weight of each interval in each adjustable parameter well with a preset energy consumption threshold value to divide all the intervals in each adjustable parameter well into a high-energy consumption interval and a low-energy consumption interval; different injection intensity ranges are set for the thin layer section and the thick layer section selected by the high energy consumption layer section and the low energy consumption layer section, and the result of multiplying the effective thickness of each layer section by the corresponding injection intensity range is used as the injection allocation range of each layer section in each adjustable parameter well.
8. The polymer flooding monitoring system for the water lift phase of three types of oil reservoirs according to claim 7, wherein said dividing all intervals in each adjustable well into high energy consumption intervals and low energy consumption intervals comprises: Among all the intervals of each adjustable parameter well, the interval with the energy consumption weight larger than the preset energy consumption threshold is marked as a high-energy consumption interval, and the rest of all the intervals are marked as low-energy consumption intervals.
9. The polymer flooding monitoring system of claim 7, wherein said dividing the low energy interval into a thin interval and a thick interval comprises: The low-energy-consumption layer segments with the effective thickness larger than the preset effective thickness threshold value are marked as thick layer segments, and all the rest low-energy-consumption layer segments are marked as thin layer segments.
10. The polymer flooding monitoring system for the water lift phase of three types of oil reservoirs of claim 1, wherein said developing a fracturing plan for a production well comprises: If the jet-open thickness of the extraction well communicated with the current parameter-adjusting limited well is larger than a preset jet-open thickness threshold, multi-crack fracturing is adopted for the extraction well, otherwise, common fracturing is adopted.

Description

Polymer polymer flooding monitoring system for three types of oil layers in water-containing lift-back period Technical Field The invention relates to the technical field of energy-saving reconstruction of equipment, in particular to a polymer flooding monitoring system for three types of oil layers in a water-containing lift period. Background With the rapid development of polymer flooding technology and the wide popularization and application in Daqing oil fields, the residual reserves of one type of oil layer are continuously reduced, and the polymer flooding object is gradually transformed into three types of oil layers, so that compared with one type of oil layer, the three types of oil layers have small effective thickness, low permeability and strong interlayer and plane heterogeneity, and the tracking and adjusting technology for maturation of one type of oil layer cannot be directly applied. The polymer flooding can be divided into an initial stage of injection polymerization, a water-containing falling period, a water-containing low-value period, a water-containing rising period and a subsequent water flooding, wherein the water-containing rising period has long retention time, the oil production ratio of the stage is large, and the contribution to the improvement of the recovery ratio of the block is large. The existing comprehensive adjustment method for the polymer flooding water-containing rise period mainly comprises three technical means, namely, plugging a high permeable layer through deep profile control to slow down fluid single-layer bursting, performing pressure regulation and separate-layer water injection on an injection well to improve the injection profile, and adopting a fracturing and extraction combined mode on a production well to use a low-water-content and difficult-to-use oil layer. However, when the method is applied to three types of oil layers with stronger heterogeneity and poorer physical properties, the system switching decision is only dependent on reservoir response indexes such as water content, liquid absorption profile and the like, and the quantitative consideration on the energy consumption of injection equipment is lacking, so that the decision subjectivity is strong, and the high-consumption and low-efficiency ineffective injection is caused. Disclosure of Invention In order to solve the technical problems, the invention aims to provide a polymer flooding monitoring system for three types of oil layers in a water-containing lift period, and the adopted technical scheme is as follows: the invention provides a polymer flooding monitoring system for three types of oil layers in a water-containing lift phase, which comprises the following components: The system comprises an adjustment system switching judging module, a system switching judging module and a system switching judging module, wherein the adjustment system switching judging module is used for measuring the difference of average oil production of all production wells in each preset period compared with preset reference oil production and the power consumption of an injection pump in the injection well when all injection wells are injected with a preset first adjustment system, and evaluating the injection efficiency index in each period; The energy-saving optimization module of the injection well is used for counting the injection pressure space of all injection wells when the switching condition is reached so as to divide all injection wells into adjustable parameter wells and parameter adjustment limited wells, injecting a preset second adjustment system into all adjustable parameter wells, counting the injection pressure and injection flow of each layer section in each adjustable parameter well so as to determine the energy consumption weight of each layer section in each adjustable parameter well, counting the effective thickness of each layer section in each adjustable parameter well based on the energy consumption weight, and planning the distribution injection quantity range of each layer section in each adjustable parameter well; and aiming at the parameter-regulating limited well, counting the jet-open thickness of the production wells communicated with all the parameter-regulating limited wells to formulate a fracturing scheme of the production well for carrying out cooperative optimization on the parameter-regulating limited well. Preferably, the injection efficiency index in each period is the result of the difference between the average oil yield in each period and the preset reference oil yield and the total power consumption of the injection pumps in all injection wells. Preferably, the determining whether to switch the adjustment system of the injection well at the current time includes: if the injection efficiency index continuously decreases for a preset number of periods before the current moment and is smaller than the preset threshold value, switching the adjustment system of the inj