CN-116245411-B - Quantitative comprehensive evaluation method for oil-stabilizing and water-controlling effects of horizontal well

CN116245411BCN 116245411 BCN116245411 BCN 116245411BCN-116245411-B

Abstract

The invention relates to an oil-gas field development technology, and discloses a quantitative comprehensive evaluation method for oil-stabilizing and water-controlling effects of a horizontal well. The method comprises the steps of judging whether a water control target well is an old well or a new well in production, collecting relevant working condition parameters of a single well water control economic benefit evaluation according to the condition that the water control process is applied before, after, and at the same level as the oil column height, collecting relevant parameters required by single well water control economic benefit evaluation, evaluating the influence of the water control process application on oil production and water production by adopting index parameters such as water control effective period, oil increase, water production change and the like through rice oil production index and water content comparison, evaluating the water control effect, evaluating the water control economical efficiency of the single well water control according to the water control effect, and comprehensively evaluating the water control effect and economical efficiency of the horizontal well. The method provided by the invention is used for carrying out quantitative comprehensive evaluation on the water control effect from the aspects of measure oil increasing, oil stabilizing, water control and economy, effectively evaluating the oil stabilizing and water control effect and economy of the horizontal well and effectively guiding the design of a water control scheme and process selection.

Inventors

ZHANG XIAOCHENG
XU TAO
JIA LIXIN
ZHANG HUI
YUAN WEIWEI
LIN JIAYU
XIAO YAO
YAN QIEHAI
SONG CHUANG
LI JIN
HAN YAOTU
GONG NING
HUO HONGBO
WANG XIAOPENG
CHEN BIN
XU GANG
ZHANG QILONG

Assignees

中海石油（中国）有限公司天津分公司

Dates

Publication Date: 20260505
Application Date: 20230223

Claims (6)

1. The quantitative comprehensive evaluation method for the oil-stabilizing and water-controlling effects of the horizontal well is characterized by comprising the following steps of: (1) Judging whether the water control target well is an old well or a new well in production; (2) According to the related working condition parameters of the old well or the new well in production, the related working condition parameters of the adjacent well with the same production allocation or the same oil column height are collected before and after the water control process is applied, and the related working condition parameters comprise the meter oil production index, daily oil production, water content, oilfield reduction rate gamma and reservoir thickness; (3) Collecting relevant parameters required by single well water control economic benefit evaluation, wherein the relevant parameters comprise water control cost I tr , unit water treatment cost I w , oil price S o and Renminbi exchange rate delta; (4) The water control effect evaluation of the new well comprises the steps of comparing the production conditions before and after the application of the water control process, namely comparing the new well with the adjacent wells with the same production allocation or the same oil column height and the same layer; (5) Through rice oil extraction index and water content comparison, index parameters including water control effective period, oil increasing amount and water production variation are adopted, the influence of water control process application on oil production and water production is evaluated, and further the water control effect is evaluated, wherein the water control effective period of an old well is determined through comparing the water content variation before and after the measure, and the water control effective period of a new well is determined through comparing the water content variation of an adjacent well; (6) According to the water control effect, single well water control economical evaluation is carried out on the old well or the new well which is used for effectively controlling water; (7) Taking the meter oil production index, the water content, the water control effective period, the oil increasing amount, the water production change amount and the single well benefit as a horizontal well water control effect quantification index system, and comprehensively evaluating the water control effect and the economy of the horizontal well by combining the calculation results of the steps (1) - (6).
2. The method of claim 1, wherein the rice oil production index in step (2) comprises a rice oil production index K 0 before the old well water control process is applied, a rice oil production index K t after the water control target well water control process is applied, a new well water control target well co-located rice oil production index K pt , and a new well water control target well co-located rice oil production index K lt for the adjacent well; Daily oil comprises daily oil Q o0 before the application of the old well water control process, daily oil Q ot after the application of the water control target well water control process, daily oil Q opt produced by the new well water control target well, daily oil Q olt of the new well water control target well in the same horizon and daily oil Q oi of the adjacent well corresponding to the moment i; The water content comprises water content S w0 before the application of the production old well water control process, water content S wt of the water control target well after the application of the water control process, water content S wpt of the new well water control target well, water content S wlt of the new well water control target well in the same layer and adjacent well and water content S wi corresponding to the moment i; The reservoir thickness comprises the reservoir thickness h of the old well control water well, the reservoir thickness h p of the new well control water target well Chu Cenghou, and the reservoir thickness h l of the new well control water same layer and the adjacent well.
3. The method of claim 2, wherein the evaluating the water control effect in step (5) comprises: 1) If K t <K 0 is applied to the old well water control process and if K t <K pt or K t <K lt is applied to the new well water control process, the crude oil yield is reduced by the application of the water control process, namely delta Q o <0, the purposes of stabilizing oil and controlling water or increasing oil and controlling water are contrary, the application effect is poor, and the water control is ineffective; 2) If K t =K 0 is applied to the old well water control process and if K t =K pt or K t =K lt is applied to the new well water control process, the application of the water control process has no influence on the yield of crude oil, namely DeltaQ o =0, and the conditions can be divided into the following two conditions according to the water content contrast ratio: ① If S wt ≧S w0 is performed after the old well water control process is applied, and if S wt ≧S wpt or S wt ≧S wlt is performed after the new well water control process is applied, the water content is not reduced and is reversely increased after the water control process is applied, and the water control is ineffective; ② If S wt <S w0 is carried out after the old well water control process is applied, and if S wt <S wpt or S wt <S wlt is carried out after the new well water control process is applied, the water content is reduced after the water control process is applied, the water control is effective, the oil and water control is stable, and according to the water content change comparison, the water control effective period T and the water production change quantity delta Q w are calculated by adopting the following formulas respectively; a) Old well water control: Water control effective period: T 0 represents the initial time of production after water control, Represents the corresponding time when the water content is the same as the water content before water control in the production process after the water control process is applied, Yield change amount: N represents the production well time after the measure; b) And (3) controlling water in a new well: Water control effective period: , The corresponding time when the water content is the same as the water content of the production allocation or the comparison adjacent well in the production process after the water control process is applied, The water production change quantity is compared with the production allocation , When compared with adjacent well ; 3) If K t >K 0 is applied to the old well water control process and if K t >K pt or K t >K lt is applied to the new well water control process, the crude oil yield is increased, the oil increasing effect is achieved, namely delta Q o is more than 0, the water control effective period T and the oil increasing delta Q o are calculated according to the rice oil extraction index change comparison respectively by adopting the following formulas; a) Old well water control: Water control effective period: , represents the corresponding time when the rice oil production index is the same as the rice oil production index before water control in the production process after the water control process is applied, Oil increasing amount: N represents the production well time after the measure, deltaP t represents the production pressure difference after the water control process is applied, deltaP 0 represents the production pressure difference before the old well water control process is applied; b) And (3) controlling water in a new well: Water control effective period: , Indicating the corresponding time when the rice oil production index is the same as the production allocation or comparison adjacent well rice oil production index in the production process after the water control process is applied, The oil quantity is increased when compared with the production allocation , When compared with adjacent well Δp pt represents the new well water control target well production pressure differential, Δp lt represents the new well water control co-horizon contrast adjacent well pressure differential; ① If S wt >S w0 is performed after the old well water control process is applied, and if S wt >S wpt or S wt >S wlt is performed after the new well water control process is applied, the water content is increased after the water control process is applied, the crude oil yield is increased, the water yield is increased, and the water control effect needs to be comprehensively evaluated in combination with the economical efficiency; ② If S wt =S w0 is applied to the old well water control process, and if S wt =S wpt or S wt =S wlt is applied to the new well water control process, the water content is unchanged after the water control process is applied, but the actual water yield is increased, and the water control effect needs to be comprehensively evaluated by combining with economy; ③ If after the old well water control process is applied, if S wt <S w0 , and after the new well water control process is applied, if S wt <S wpt or S wt <S wlt , the water content is reduced after the water control process is applied, the actual water yield can be unchanged, namely delta Q w =0, or reduced, namely delta Q w is less than 0, and the working condition is the most ideal oil increasing water control condition; the produced water variation Δq w can be calculated from the following formula: a) Old well water control: ; b) And (3) controlling water in a new well: And yield-matching comparison: S wpi represents the corresponding water ratio of the production allocation at the moment i under the condition of controlling water in a new well, And comparison with adjacent wells: S wli represents the water content of the adjacent wells in the same horizon corresponding to the moment i under the condition of controlling water of the new well.
4. The method of claim 3, wherein the single well water control economy evaluation in the step (6) comprises calculating the water treatment cost I wz or the water treatment cost I wj and the oil production profit I o which are increased or decreased due to the increase or decrease of the water production according to the formula I wj （I wz ）=ΔQ w ×i w 、I o =S o ×ΔQ o X6.2898X delta, respectively, and then calculating the single well water control economic benefit DeltaI, namely the relation between the cost input and the economic output according to the formula DeltaI= (I o +I wj ）-（I tr +I wz ); if delta I is more than 0, economic benefit and money are earned; If delta I is less than 0, economic negative benefits are achieved, and money is saved; If Δi=0, then economic zero benefit is earned without claims.
5. The method of claim 4, wherein the horizontal well control water effect quantification index system of step (7) comprises meter index, water cut, water control expiration date, oil increase, water production variation and single well benefit.
6. The method of claim 5, wherein the water control effect and economy of the horizontal well in step (7) are only effective if the water control is performed on the premise that the oil amount of the water is increased or not changed, and the water control process of limiting the liquid and sacrificing the oil production is ineffective; on the premise of increasing or stabilizing oil, if the water yield is increased, unchanged or reduced, comprehensive evaluation needs to be carried out by combining the economic benefit of single well water control, and the corresponding water control technological measures are effective only when the economic benefit delta I of single well water control is more than 0.

Description

Quantitative comprehensive evaluation method for oil-stabilizing and water-controlling effects of horizontal well Technical Field The invention relates to an oil-gas field development technology, in particular to a quantitative comprehensive evaluation method for oil-stabilizing and water-controlling effects of a horizontal well. Background The oil-stabilizing water-controlling development is a requisite path for the development of a bottom water reservoir, and the oil-stabilizing water-controlling process is divided into two main types of horizontal open hole water-controlling and horizontal cased hole selective perforation water-controlling, wherein the horizontal open hole water-controlling process also comprises a central pipe, a variable density screen pipe, an inflow control valve (ICD), an intelligent inflow control valve (AICD), a continuous packer and other process technologies. The water control effect evaluation is a key step and a method for judging whether the application effect of the water control process is good or bad, is also a main judgment basis for reasonable selection of the water control process and design of a water control scheme, and can effectively judge the adaptability and the matching of the water control process and the working conditions such as the geological oil reservoir characteristics, the fluid properties, the well conditions and the like. Therefore, the water control effect evaluation is particularly important for the selection, application and post-evaluation of the water control process. At present, various methods are adopted by each oil field and each service provider in the water control effect evaluation, such as single water content index evaluation, yield allocation comparison evaluation, water content change comparison before and after measures, adjacent well comparison evaluation, production curve comparison evaluation and the like, but a unified water control effect quantification index system and an evaluation method are not adopted. Meanwhile, the evaluation method usually omits the evaluation of the oil increasing or stabilizing effect, is only the technical effect evaluation, lacks the comprehensive evaluation of the economical efficiency of the process application, and cannot meet the requirements of quantitative evaluation of the water control effect and development of the water control process. Disclosure of Invention The invention aims to provide the quantitative comprehensive evaluation method for the oil stabilizing and water controlling effects of the horizontal well, which is reliable in principle and convenient in practical operation, can effectively evaluate the application effects and economy of the water controlling process, provides scientific basis for reasonable selection and effect evaluation of the water controlling process, and has wide application prospect. In order to achieve the purpose, the invention provides a quantitative comprehensive evaluation method for the oil stabilizing and water controlling effects of a horizontal well, which comprises the following steps: (1) Judging whether the water control target well is an old well or a new well in production; (2) According to the related working condition parameters of the old well or the new well in production, the related working condition parameters of the adjacent well with the same production allocation or the same oil column height are collected before and after the water control process is applied, and the related working condition parameters comprise the meter oil production index, daily oil production, water content, oilfield reduction rate gamma, reservoir thickness and the like; (3) Collecting relevant parameters required by single well water control economic benefit evaluation, wherein the relevant parameters comprise water control cost I tr, unit water treatment cost I w, oil price S o and Renminbi exchange rate delta; (4) The water control effect evaluation of the new well comprises the steps of comparing the production conditions before and after the application of the water control process, namely comparing the new well with the adjacent wells with the same production allocation or the same oil column height and the same layer; (5) Through rice oil extraction index and water content comparison, index parameters including water control effective period, oil increasing amount and water production variation are adopted to evaluate the influence of water control process application on oil production and water production, so as to evaluate the water control effect; (6) Carrying out single-well water control economical evaluation according to the water control effect; (7) Taking the meter oil production index, the water content, the water control effective period, the oil increasing amount, the water production change amount and the single well benefit as a horizontal well water control effect quantification index system, and comprehensively evaluating the water control eff