阅读说明：本技术 基于hall曲线的高渗条带判定方法 (Hypertonic strip judging method based on HALL curve ) 是由 王贺华 杨滔 王志坤 周宗明 黄海平 曹剑 杨鸿� 田雨 吕新东 谢恩 蒋开 于 2019-11-07 设计创作，主要内容包括：本发明公开了基于HALL曲线的高渗条带判定方法,包括以下步骤：S1、作出油井水油比WOR、水油比导数WOR’与生产时间的双对数曲线；S2、根据所述双对数曲线识别水窜类型,找出可能存在高渗条带的井组区域；S3、对找出的井组区域内的所有注水井作出HALL曲线；S4、确定典型HALL曲线,对比实际注水井的HALL曲线与典型HALL曲线：当有注水井的HALL曲线偏离典型HALL曲线,且低于其它井的平均HALL曲线时,判定该注水井所控制的油井的见水类型为高渗条带见水型。本发明的目的在于提供基于HALL曲线的高渗条带判定方法,以解决现有技术中难以确定非正常出水是否是由高渗条带所导致的问题,实现提高对高渗条带的识别准确性的目的。(The invention discloses a method for judging a hypertonic strip based on a HALL curve, which comprises the following steps: s1, making a log-log curve of the oil well water-oil ratio WOR, the water-oil ratio derivative WOR' and the production time; s2, identifying the water channeling type according to the log-log curve, and finding out a well group area possibly having a hypertonic strip; s3, making HALL curves for all water injection wells in the well group area; s4, determining a typical HALL curve, and comparing the HALL curve of the actual water injection well with the typical HALL curve: and when the HALL curve of the water injection well deviates from the typical HALL curve and is lower than the average HALL curve of other wells, judging that the water breakthrough type of the oil well controlled by the water injection well is a hypertonic strip water breakthrough type. The invention aims to provide a hypertonic banding judgment method based on a HALL curve, which aims to solve the problem that whether abnormal water outlet is caused by the hypertonic banding is difficult to determine in the prior art and realize the aim of improving the identification accuracy of the hypertonic banding.)

1. The method for judging the hypertonic strip based on the HALL curve is characterized by comprising the following steps:

s1, making a log-log curve of the oil well water-oil ratio WOR, the water-oil ratio derivative WOR' and the production time;

s2, identifying the water channeling type according to the log-log curve, and finding out a well group area possibly having a hypertonic strip;

s3, making HALL curves for all water injection wells in the well group area;

s4, determining a typical HALL curve, and comparing the HALL curve of the actual water injection well with the typical HALL curve: and when the HALL curve of the water injection well deviates from the typical HALL curve and is lower than the average HALL curve of other wells, judging that the water breakthrough type of the oil well controlled by the water injection well is a hypertonic strip water breakthrough type.

2. The HALL-curve-based hypertonic strip determination method according to claim 1, wherein the water channeling type in step S2 comprises: the transition zone can move water to flow, weak bottom water can push water to flow, strong bottom water can push water to flow, and high-permeability zone can push water to flow.

3. The method for determining a hyperosmotic banding based on a HALL curve as claimed in claim 2, wherein:

the double-logarithmic curve characteristic of the movable water channeling of the transition zone is as follows: the value of the water-oil ratio at the initial stage of exploitation is high, the water-oil ratio continuously rises after a period of production, and the water-oil ratio rises slowly at the initial stage and rises quickly at the middle and later stages; the water-oil ratio derivative curve is in an ascending trend as a whole;

the characteristics of the double logarithmic curve of the weak bottom water propulsion water channeling are as follows: the water-oil ratio curve at the initial stage of exploitation is kept stable, the water-oil ratio of the oil well is reduced after water breakthrough, the water-oil ratio is reduced more slowly than at the initial stage, and the water-oil ratio is reduced more quickly at the middle and later stages; the integral water-oil ratio derivative curve is in a descending trend;

the characteristic of the double logarithmic curve of the strong bottom water propulsion water channeling is as follows: the water-oil ratio curve shows a continuous rising trend at the beginning of exploitation, the water-oil ratio rises faster after the oil well breaks into water, and the water-oil ratio is kept stable at the later stage; the integral water-oil ratio derivative curve is in a descending trend;

the characteristic of the double logarithmic curve of the water channeling of the hypertonic strip is as follows: at the initial stage of exploitation, the water-oil ratio and the water-oil ratio derivative are very low; after the oil well breaks into water, the water-oil ratio continuously rises, and the water-oil ratio rises faster in the initial period and rises slower in the middle and later periods; the water-oil ratio derivative curve is in an ascending trend as a whole.

4. The method of claim 1, wherein in step S2, if the log-log curve of N wells satisfies the log-log characteristic of water channeling of the hypertonic strip, the reservoir between the N wells is a well group area where the hypertonic strip is likely to exist, wherein N is greater than or equal to 2.

Technical Field

The invention relates to the field of oilfield development, in particular to a hyperosmotic stripe judgment method based on HALL curves.

Background

The presence of hypertonic streaks is one of the main causes of excessive water production during the production of many oil fields. How to identify the high permeability strips becomes a key for improving the development effect of the severe heterogeneous fault block oil reservoir in the later development stage. The HALL process is a method for evaluating the dynamics of a water injection well in oilfield waterflooding development, which is based on steady-state flow. In the prior art, the type of abnormal water outlet of an oil well and geological control factors thereof are difficult to accurately judge, so that whether the abnormal water outlet is caused by a hypertonic strip or not is more difficult to determine.

Disclosure of Invention

The invention aims to provide a hypertonic banding judgment method based on a HALL curve, which aims to solve the problem that whether abnormal water outlet is caused by the hypertonic banding is difficult to determine in the prior art and realize the aim of improving the identification accuracy of the hypertonic banding.

The invention is realized by the following technical scheme:

the hypertonic banding judgment method based on the HALL curve comprises the following steps:

s1, making a log-log curve of the oil well water-oil ratio WOR, the water-oil ratio derivative WOR' and the production time;

s2, identifying the water channeling type according to the log-log curve, and finding out a well group area possibly having a hypertonic strip;

s3, making HALL curves for all water injection wells in the well group area;

s4, determining a typical HALL curve, and comparing the HALL curve of the actual water injection well with the typical HALL curve: and when the HALL curve of the water injection well deviates from the typical HALL curve and is lower than the average HALL curve of other wells, judging that the water breakthrough type of the oil well controlled by the water injection well is a hypertonic strip water breakthrough type.

Aiming at the problem that whether abnormal water outlet is caused by a hypertonic strip is difficult to determine in the prior art, the invention provides a hypertonic strip judgment method based on a HALL curve. Aiming at a found well group area possibly having a high-permeability strip, HALL curves are made for all water injection wells in the area, the HALL curves are in the prior art, and a water injection rule is obtained by adopting a mode of accumulating multiple water injection parameters, so that accidental errors caused by single water injection are well eliminated, and the seepage rule in the whole water injection process of the water injection well can be better reflected. The method determines a typical HALL curve and compares the HALL curve of an actual water injection well to the typical HALL curve: and when the HALL curve of the water injection well deviates from the typical HALL curve and is lower than the average HALL curve of other wells, judging that the water breakthrough type of the oil well controlled by the water injection well is a hypertonic strip water breakthrough type. The method comprises the steps of firstly identifying the water channeling type based on the log-log curve, reducing the identification range, then comparing HALL curves of well group areas possibly having hypertonic strips in the log-log curve, and finally judging the approximate position of the hypertonic strips.

Further, the water channeling type in step S2 includes: the transition zone can move water to flow, weak bottom water can push water to flow, strong bottom water can push water to flow, and high-permeability zone can push water to flow.

Further, the double logarithmic curve characteristic of the movable water channeling of the transition zone is as follows: the value of the water-oil ratio at the initial stage of exploitation is high, the water-oil ratio continuously rises after a period of production, and the water-oil ratio rises slowly at the initial stage and rises quickly at the middle and later stages; the water-oil ratio derivative curve is in an ascending trend as a whole;

the characteristics of the double logarithmic curve of the weak bottom water propulsion water channeling are as follows: the water-oil ratio curve at the initial stage of exploitation is kept stable, the water-oil ratio of the oil well is reduced after water breakthrough, the water-oil ratio is reduced more slowly than at the initial stage, and the water-oil ratio is reduced more quickly at the middle and later stages; the integral water-oil ratio derivative curve is in a descending trend;

the characteristic of the double logarithmic curve of the strong bottom water propulsion water channeling is as follows: the water-oil ratio curve shows a continuous rising trend at the beginning of exploitation, the water-oil ratio rises faster after the oil well breaks into water, and the water-oil ratio is kept stable at the later stage; the integral water-oil ratio derivative curve is in a descending trend;

the characteristic of the double logarithmic curve of the water channeling of the hypertonic strip is as follows: at the initial stage of exploitation, the water-oil ratio and the water-oil ratio derivative are very low; after the oil well breaks into water, the water-oil ratio continuously rises, and the water-oil ratio rises faster in the initial period and rises slower in the middle and later periods; the water-oil ratio derivative curve is in an ascending trend as a whole.

Further, in step S2, if the log-log curve of the N wells satisfies the log-log curve characteristic of the water channeling of the hypertonic strip, the reservoir between the N wells is a well group area where the hypertonic strip may exist, wherein N is greater than or equal to 2.

Compared with the prior art, the invention has the following advantages and beneficial effects:

the method for judging the hypertonic strips based on the HALL curve comprises the steps of firstly identifying the water channeling type based on the log-log curve, reducing the identification range, then comparing the HALL curve of well group areas possibly having the hypertonic strips in the log-log curve, and finally judging the approximate position of the hypertonic strips. The invention solves the problem that whether abnormal water outlet is caused by a high-permeability strip is difficult to determine in the prior art, and achieves the purpose of improving the identification accuracy of the high-permeability strip.

Drawings

The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:

FIG. 1 is a geological schematic of a transition zone of moving water in an embodiment of the invention;

FIG. 2 is a graph of water-to-oil ratio and water-to-oil ratio derivative for a transition zone in an embodiment of the present invention;

FIG. 3 is a geological schematic of the propulsion of weak bottom water in an embodiment of the present invention;

FIG. 4 is a graph of water-to-oil ratio and water-to-oil ratio derivative for a weak bottom water propulsion according to an embodiment of the present invention;

FIG. 5 is a bottom water propulsion geological schematic in an embodiment of the present invention;

FIG. 6 is a graph of bottom water propulsion water-to-oil ratio and water-to-oil derivative for an embodiment of the present invention;

FIG. 7 is a water-flooding multi-channel geological schematic in an embodiment of the present disclosure;

FIG. 8 is a water injection multi-channel water-oil ratio and water-oil ratio derivative graph in accordance with an embodiment of the present invention;

FIG. 9 is a graph of the water-oil ratio and the derivative of the water-oil ratio of the 1# well in an embodiment of the present invention

FIG. 10 is a graph of the water-to-oil ratio and the derivative of the water-to-oil ratio for well # 2 in accordance with an embodiment of the present invention;

FIG. 11 is a diagram of an exemplary HALL curve template in accordance with an embodiment of the present invention;

FIG. 12 is a HALL curve of an actual reservoir injection well in an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.

The method for judging the hypertonic strip based on the HALL curve comprises the following steps:

s1, making a log-log curve of the oil well water-oil ratio WOR, the water-oil ratio derivative WOR' and the production time;

the oil well has different morphological characteristics of the log curves of the water-oil ratio and the derivative of the water-oil ratio and the production time under different geological conditions, and the water channeling type can be quickly identified by using the different morphological characteristics of the log curves.

S2, identifying the water channeling type according to the log-log curve, and finding out a well group area possibly having a hypertonic strip;

for the water channeling type of the movable water in the transition zone as shown in fig. 1, the water breakthrough of the oil well is early, the value of the initial water-oil ratio is high, the water-oil ratio continuously rises after a period of production, the initial rise is slow, the rise is fast in the middle and later periods, and the water-oil ratio derivative curve shows a rising trend as a whole, which is shown in fig. 2 in particular.

For the weak bottom water propelled water channeling type as shown in fig. 3, the water-to-oil ratio curve remains flat during the early stages of production. After the oil well breaks through water, the water-oil ratio is reduced, the initial reduction is slow, the middle and later reduction is fast, and the water-oil ratio derivative curve shows the whole trend of reduction, which is shown in figure 4.

For the strong bottom water propelled water channeling type as shown in fig. 5, the water-to-oil ratio curve shows a tendency to continue rising as soon as production begins. After the oil well breaks into water, the water-oil ratio rises faster, the water-oil ratio at the later stage is kept stable basically, and the water-oil ratio derivative curve shows a falling trend overall, which is shown in figure 6.

For a water production of the hypertonic strip water channeling type as shown in fig. 7, the water-oil ratio and the derivative of the water-oil ratio are low in the initial stage. After the oil well breaks into water, the water-oil ratio continuously rises, the initial rise is fast, the middle and later rises slowly, and the water-oil ratio derivative curve integrally shows a rising trend, which is shown in figure 8.

The water-oil ratio curve of a plurality of horizontal wells at a certain position of a certain block is drawn, and as can be seen from fig. 9 and 10, the curve forms of the 1# and 2# wells are similar to the theoretical curve and the curve calculated by a digital analog under the high permeability zone, so that the high permeability zone of the reservoir among the well groups is preliminarily inferred.

S3, making HALL curves for all water injection wells in the well group area;

s4, determining a typical HALL curve, and comparing the HALL curve of the actual water injection well with the typical HALL curve: and when the HALL curve of the water injection well deviates from the typical HALL curve and is lower than the average HALL curve of other wells, judging that the water breakthrough type of the oil well controlled by the water injection well is a hypertonic strip water breakthrough type.

The hall curve form of a typical water injection problem is obtained through research, and whether a high-permeability strip exists around a water injection well or not can be preliminarily judged by comparing the hall curve of an actual production curve with the typical curve. The present water injection status can be quickly diagnosed by the form of a typical Hall curve (fig. 11), and particularly, when the Hall curve of a water injection well is lower than the average Hall curve of other wells, the water injection well indicates that a hypertonic strip exists around the well, and the approximate position of the hypertonic strip can be distinguished by utilizing the characteristic.

In this embodiment, a HALL curve of a plurality of water injection wells at a certain position of a certain block is drawn (fig. 12), and the HALL curves in the figure all show that the curve of the AD2-8-4H well is obviously lower than that of other water injection wells, so that the existence of a hypertonic strip is determined in the area where the well is located, and the water breakthrough type of the oil well corresponding to the well is a hypertonic strip water breakthrough type.

The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.