CN-121981583-A - Evaluation method and evaluation system for PD reserve increased by nano polymer microsphere profile control

CN121981583ACN 121981583 ACN121981583 ACN 121981583ACN-121981583-A

Abstract

The invention discloses an evaluation method and an evaluation system for increasing PD reserves by regulating and flooding of nano polymer microspheres, and belongs to the technical field of oil reservoir evaluation. The method comprises the steps of drawing an annual oil production-production time curve, respectively predicting annual oil production data of a well group developed by water flooding and annual oil production data of a well group developed by oil flooding according to the annual oil production-production time curve, respectively calculating and comparing residual economic recoverable reserves of the well group developed by water flooding and the well group developed by oil flooding according to the annual oil production data of the well group developed by oil flooding and the annual oil production data of the well group developed by oil flooding according to the economic limit annual oil production data. The method has stronger reasonable certainty and practicability, and provides powerful guarantee for the efficient development of low-permeability oil reservoirs.

Inventors

LIU YUNLONG
WANG YAN
YI PING
LV WEI
MA BO
WU BAOQIANG
CHENG CHEN
CHEN JIAJUN
WANG JUN
ZHANG RONG

Assignees

中国石油天然气股份有限公司

Dates

Publication Date: 20260505
Application Date: 20241031

Claims (10)

1. The evaluation method for increasing PD reserves by regulating and flooding of the nano polymer microspheres is characterized by comprising the following steps of: Drawing a annual oil production-production time curve; Based on the annual oil production-production time curve, the annual oil production data of the well group in the water flooding stage without implementing the nano polymer microsphere profile and the annual oil production data of the well group in the profile stage with implementing the nano polymer microsphere profile are utilized to respectively predict the annual oil production data of the well group developed by the water flooding and the annual oil production data of the well group developed by the profile; And respectively calculating and comparing the residual economic recoverable reserves of the well group for water flooding development and oil flooding development according to the annual oil production data of the well group for water flooding development prediction and the annual oil production data of the well group for oil flooding development prediction combined with the economic limit annual oil production data, and evaluating the implementation effect.
2. The method for evaluating an increase in PD reserve by a nano-polymer microsphere profile control according to claim 1, wherein the annual oil production data of the well group for which the water-flooding phase of the nano-polymer microsphere profile control is not performed is at least annual oil production data of 5 years or more; the implementing time of the profile control phase of the profile control of the nano polymer microsphere is at least 3 years.
3. The method for evaluating an increase in PD reserve by a nano-polymer microsphere profile control according to claim 1, wherein the water-flooding phase trend of the annual oil production data of the well group for which the water-flooding phase of the nano-polymer microsphere profile control is not performed is a decreasing trend; the oil displacement and displacement stage trend of the annual oil production data of the well group in the oil displacement and displacement stage of the nano polymer microsphere is a decreasing trend or an increasing trend, the oil displacement and displacement effect of the decreasing trend in the oil displacement and displacement stage is decreasing, and the oil displacement and displacement effect of the increasing trend in the oil displacement and displacement stage is net oil increase.
4. The method for evaluating an increase in PD reserve by flooding of a nano-polymer microsphere according to claim 3, wherein the decreasing trend of the water flooding phase and the decreasing trend of the flooding phase both satisfy an exponential decreasing rule.
5. The method according to claim 3, wherein when the trend of the water flooding stage is a decreasing trend, the annual oil production data of the well group of the water flooding stage, in which the water flooding stage is not performed before the water flooding stage, of the water flooding stage, in which the water flooding of the water flooding stage is performed for at least 5 years, is taken as the initial output, and the decreasing trend of the water flooding stage is combined, the initial decreasing rate of the water flooding stage is calculated, and the annual oil production data of the well group of the water flooding development is predicted.
6. The method of claim 3, wherein the profile control phase trend is a decreasing trend when the annual oil production data of the well group in which the profile control of the nano-polymer microspheres is performed is lower than the annual oil production data of the well group in which the profile control of the nano-polymer microspheres is not performed; when the trend of the profile control phase is a decreasing trend, taking the annual oil production data of the profile control annual well group for initially implementing the nano polymer microsphere profile control as the initial yield, calculating the initial decreasing rate of the profile control phase by combining the decreasing trend of the profile control phase, and predicting the annual oil production data of the profile control annual well group.
7. The method of claim 3, wherein the profile control phase trend is an increasing trend when the annual oil production data of the well group in which the profile control of the nano-polymer microspheres is performed is higher than the annual oil production data of the well group in which the profile control of the nano-polymer microspheres is not performed; When the trend of the profile control phase is an increasing trend, taking the annual oil production data of the well group of the profile control year of the current profile control by using the nano polymer microspheres as the initial yield, wherein the value of the initial decreasing rate is the initial decreasing rate of the water flooding phase, fitting the annual oil production data of the profile control phase, and predicting the annual oil production data of the well group of the profile control development.
8. The method for evaluating the PD reserve increase of the nano-polymer microsphere profile control according to claim 1, wherein the calculation formula of the economic limit annual oil production data is as follows: Q ELT ＝Q EL *N*T Wherein Q ELT is economic limit annual oil production data, N is oil well adjustment and displacement number, T is time, and Q EL is economic limit daily oil production of a single well.
9. The method for evaluating the PD reserve by controlling displacement of nano-polymer microspheres according to claim 8, wherein the calculation formula of the daily oil production of the economic limit of a single well is as follows: Wherein Q EL -economic limit daily oil production of a single well, T/D, C T -fixed cost of the single well, yuan/year, D a -annual production days of the single well, day, P o -raw oil selling price, yuan/T, T axo -raw oil comprehensive tax, yuan/T, C V -variable cost, yuan/T, D o -raw oil commodity rate,% GOR-gas-oil ratio, ksquare meter/T, D g -natural gas commodity rate,% P g -natural gas selling price, yuan/Ksquare meter, T axg -natural gas comprehensive tax, yuan/Ksquare meter.
10. The evaluation system for increasing PD reserves by regulating and driving of the nano polymer microspheres is characterized by comprising a curve drawing module, a prediction module and an evaluation module; the curve drawing module is used for drawing an annual oil production-production time curve; The prediction module is used for respectively predicting the annual oil production data of the well group developed by the water flooding and the annual oil production data of the well group developed by the profile control by using the annual oil production data of the well group in the water flooding stage without the profile control by the nano polymer microspheres and the annual oil production data of the well group in the profile control stage with the profile control by the nano polymer microspheres based on the annual oil production-production time curve; And the evaluation module is used for respectively calculating and comparing the residual economic recoverable reserves of the well group for water flooding development and profile control development according to the annual oil production data of the well group for water flooding development prediction and the annual oil production data of the well group for profile control development combined with the economic limit annual oil production data.

Description

Evaluation method and evaluation system for PD reserve increased by nano polymer microsphere profile control Technical Field The invention belongs to the technical field of oil reservoir evaluation, and particularly relates to an evaluation method and an evaluation system for increasing PD reserves by using nano polymer microsphere profile control. Background The low permeability oilfield development not only faces the problem of low permeability, but also the problem of strong heterogeneity of the reservoir is a trouble in oilfield development. At present, most of low-permeability oil reservoirs are developed by water injection, on one hand, injection water is suddenly fed along a hypertonic channel due to strong heterogeneity of the reservoir, water in an oil well rises rapidly, an advantageous water flooding channel is urgently required to be subjected to profile control and plugging, and on the other hand, the conventional profile control and flooding agent is poor in injectability due to low permeability, plugging can only be formed in a near-wellbore zone of a water injection well, and cannot enter the deep part of the reservoir. The nano polymer microsphere has small particle size, has the advantages of 'injecting, getting far away, blocking, retaining and the like', and has important significance for improving water flooding contradiction after a high water content period in a low-permeability oil reservoir, controlling water content rise and ensuring continuous and stable production of an oil well. From the aspect of SEC reserves evaluation, the polymer microsphere profile control technology remarkably improves oil reservoir water drive contradiction, optimizes the current oil and water production curve section, effectively reduces the natural decrement of an implementation area and increases the residual recoverable reserves. However, no related method for evaluating the influence of the polymer microsphere profile control technology on PD reserves exists at present. Disclosure of Invention In order to overcome the defects in the prior art, the invention aims to provide an evaluation method and an evaluation system for increasing PD reserves by using nano polymer microsphere profile control, and provides a strict reserve prediction method according to SEC reserves evaluation rules, and the economy of the method is evaluated. In order to achieve the above purpose, the invention is realized by adopting the following technical scheme: The invention provides an evaluation method for increasing PD reserves by regulating and flooding of a nano polymer microsphere, which comprises the following steps: Drawing a annual oil production-production time curve; Based on the annual oil production-production time curve, the annual oil production data of the well group in the water flooding stage without implementing the nano polymer microsphere profile and the annual oil production data of the well group in the profile stage with implementing the nano polymer microsphere profile are utilized to respectively predict the annual oil production data of the well group developed by the water flooding and the annual oil production data of the well group developed by the profile; And respectively calculating and comparing the residual economic recoverable reserves of the well group for water flooding development and oil flooding development according to the annual oil production data of the well group for water flooding development prediction and the annual oil production data of the well group for oil flooding development prediction combined with the economic limit annual oil production data, and evaluating the implementation effect. In one embodiment, the annual oil production data of the well group for which the water flooding phase of the nano-polymer microsphere profile is not performed is at least annual oil production data of more than 5 years; the implementing time of the profile control phase of the profile control of the nano polymer microsphere is at least 3 years. In an embodiment, the water flooding stage trend of the annual oil production data of the well group without implementing the water flooding stage of the nano polymer microsphere profile control is a decreasing trend; the oil displacement and displacement stage trend of the annual oil production data of the well group in the oil displacement and displacement stage of the nano polymer microsphere is a decreasing trend or an increasing trend, the oil displacement and displacement effect of the decreasing trend in the oil displacement and displacement stage is decreasing, and the oil displacement and displacement effect of the increasing trend in the oil displacement and displacement stage is net oil increase. In an embodiment, the decreasing trend of the water flooding stage and the decreasing trend of the profile control stage both meet an exponential decreasing rule. In an embodiment, when the trend of the water flooding stage is a decreasing trend