CN103132986B - A kind of method of the Liquid output of the different reservoir measuring coal bed gas well - Google Patents
A kind of method of the Liquid output of the different reservoir measuring coal bed gas well Download PDFInfo
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- CN103132986B CN103132986B CN201310046155.4A CN201310046155A CN103132986B CN 103132986 B CN103132986 B CN 103132986B CN 201310046155 A CN201310046155 A CN 201310046155A CN 103132986 B CN103132986 B CN 103132986B
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Abstract
The method that the invention discloses the Liquid output of a kind of different reservoir measuring coal bed gas well, particularly as follows: when each reservoir of coal bed gas well is carried out separate stratum fracfturing, the fracturing fluid of different reservoirs adds different types of chemical tracer, and in the fracturing fluid of different reservoir, the concentration of chemical tracer is identical; Carry out each post-fracturing reservoir closing layer mining, measure total fluid production and detect the concentration of chemical tracer various types of in Produced Liquid; Concentration according to chemical tracer various types of in Produced Liquid calculates the Liquid output ratio of the different reservoir of described coal bed gas well, calculates the Liquid output of different reservoir in conjunction with total fluid production. Different reservoir Liquid output or its ratio may be used to determine separate stratum fracfturing effect. Relative to prior art, the present invention have simple, fast, do not affect and produce and feature with low cost.
Description
Technical field
The present invention relates to oil-gas mining field, particularly to the measuring method of the Liquid output of a kind of coal bed gas well different reservoir.
Background technology
In the development process of coal bed gas, with reservoir there is low hole, hypotonic geologic feature, if conventional straight well is not difficult to obtain production capacity by fracturing reform. And in cbm development, separate stratum fracfturing, close layer mining be through frequently with development scheme, in the case, measure the Liquid output of different reservoir of coal bed gas well, and and then evaluate separate stratum fracfturing effect and carry out technological measure and optimize significant.
Although adopting existing production test method to obtain the Liquid output of each reservoir when closing layer mining and have an admission parameter is many, the ripe advantage such as various of method, but prior art exists and affects normal manufacturing schedule, data long processing period, the shortcoming such as costly. It is unfavorable for reducing development cost.
Summary of the invention
The present invention provides the method for the Liquid output of a kind of different reservoir measuring coal bed gas well, the normal manufacturing schedule of impact that exists in the Liquid output of different reservoir when closing layer mining after coal bed gas well pressure break to solve to adopt prior art to obtain, cycle length, problem costly.
For reaching above-mentioned purpose, the technical scheme is that and be achieved in that:
The method that the invention discloses the Liquid output of a kind of different reservoir measuring coal bed gas well, the method includes:
When each reservoir of coal bed gas well is carried out separate stratum fracfturing, the fracturing fluid of different reservoirs adds different types of chemical tracer, and in the fracturing fluid of different reservoir, the concentration of chemical tracer is identical;
Carry out each post-fracturing reservoir closing layer mining, measure total fluid production and detect the concentration of chemical tracer various types of in Produced Liquid;
Concentration according to chemical tracer various types of in Produced Liquid calculates the Liquid output ratio of the different reservoir of described coal bed gas well, calculates the Liquid output of different reservoir in conjunction with total fluid production.
In the method, the fracturing fluid of different reservoirs adds different types of chemical tracer, and in the fracturing fluid of different reservoir, the concentration of chemical tracer is identical includes:
To a reservoir, chemical tracer corresponding for this reservoir is added in prepad fluid and the load fluid of this reservoir fracturing liquid, and the of the fracturing fluid prepad fluid of different reservoir is identical with the concentration of chemical tracer in load fluid.
In the method, when each reservoir of coal bed gas well is carried out separate stratum fracfturing, the fracturing fluid of different reservoirs adds different types of chemical tracer, and in the fracturing fluid of different reservoir, the concentration of chemical tracer is identical includes:
For a reservoir, being added by chemical tracer corresponding for this reservoir in the fracturing fluid of this reservoir in advance, when this reservoir is carried out pressure break, employing has added the fracturing fluid of chemical tracer;
Or,
For a reservoir, first by the independent wiring solution-forming of chemical tracer corresponding for this reservoir, when this reservoir is carried out pressure break, chemical tracing agent solution corresponding for this reservoir and fracturing fluid are injected in this reservoir by a certain percentage.
In the method, the fracturing fluid of different reservoirs adds different types of chemical tracer, and the chemical tracer that in the fracturing fluid of different reservoir, the concentration of chemical tracer is identical includes: NaNO3、NH4SCN、NH4NO3、KNO3、KI。
In the method, the mode of the Liquid output ratio calculating the different reservoir of described coal bed gas well according to the concentration of chemical tracer various types of in Produced Liquid is:
Using the concentration proportion of the various types of chemical tracer ratio as corresponding each reservoir Liquid output.
After drawing the ratio of corresponding reservoir Liquid output, calculate the Liquid output of different reservoir in conjunction with total fluid production. The Liquid output of different reservoir or its ratio can be used to evaluate the fracturing effect of certain reservoir. When closing layer mining after separate stratum fracfturing, certain reservoir Liquid output is big, illustrates that this lamination is provided that bigger production capacity after splitting, and namely fracturing effect is better.
From above-mentioned, the including of the present invention " when each reservoir of coal bed gas well is carried out separate stratum fracfturing, adds different types of chemical tracer in the fracturing fluid of different reservoirs, and in the fracturing fluid of different reservoir, the concentration of chemical tracer is identical; Carry out each post-fracturing reservoir closing layer mining, measure total fluid production and detect the concentration of chemical tracer various types of in Produced Liquid; Concentration according to chemical tracer various types of in Produced Liquid calculates the Liquid output ratio of the different reservoir of described coal bed gas well, calculate the Liquid output of different reservoir in conjunction with total fluid production " method make only to need several simple steps can draw the Liquid output of different reservoir when closing layer mining; and can accordingly the fracturing effect of reservoir be evaluated, do not need to interrupt normal production process and data to process the cycle short. And the cost of this method is also cheap compared with prior art.
Accompanying drawing explanation
Fig. 1 is the flow chart of the method for the Liquid output of the different reservoir measuring coal bed gas well in the embodiment of the present invention.
Detailed description of the invention
For making the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, embodiment of the present invention is described further in detail.
Fig. 1 is the flow chart of the method for the Liquid output of the different reservoir measuring coal bed gas well in the embodiment of the present invention.
As it is shown in figure 1, the method for Liquid output of the different reservoir measuring coal bed gas well in the present invention includes:
Step 101: when each reservoir of coal bed gas well is carried out separate stratum fracfturing, add different types of chemical tracer in the fracturing fluid of different reservoirs, and in the fracturing fluid of different reservoir, the concentration of chemical tracer is identical.
Such as, the fracturing fluid of first reservoir adds chemical tracer A, making its concentration in the fracturing fluid of first reservoir is X, then should add chemical tracer B different types of with A in the fracturing fluid of second reservoir so that it is concentration is also X in the fracturing fluid of second reservoir.
In one embodiment of the invention, to a reservoir, chemical tracer corresponding for this reservoir is added in prepad fluid and the load fluid of this reservoir fracturing liquid, and the of the fracturing fluid prepad fluid of different reservoir is identical with the concentration of chemical tracer in load fluid.
Concrete chemical tracer can carry out selecting one from the tracer of prior art, such as sodium nitrate (NaNO3), ammonium thiocyanate (NH4SCN), ammonium nitrate (NH4NO3), potassium nitrate (KNO3), potassium iodide (KI) etc. The factor considered during chemical tracer is selected to be mainly: this chemical tracer content in reservoir rock and reservoir liquid is few; Soluble in water; Stable performance, does not react with reservoir rock and reservoir liquid; Reservoir rock is little to the absorption of tracer; Detection method is simple and reliable, highly sensitive; Safety and environmental protection; Cost is low.
When concrete addition chemical tracer, it is possible to have following two addition manner:
Mode one, according to corresponding concentration requirement, as additive, a certain amount of tracer being added mix homogeneously in of the fracturing fluid prepad fluid and load fluid, displacement fluid uses original formulation;
Mode two, by independent for tracer wiring solution-forming, in work progress, add pump with liquid the tracer to use and fracturing fluid injected by a certain percentage according to concentration requirement reservoir, stop when injecting displacement fluid injecting reactor solution.
By adding in fracturing fluid used by each reservoir making finally to be pressed into stratum containing mutually different chemical tracer, but the concentration of various chemical tracers is identical, certainly, even if concentration is incomplete same, and relatively more approximate, final evaluation effect be there will not be too much influence.
Step 102: carry out each post-fracturing reservoir closing layer mining, measures total fluid production and detects the concentration of chemical tracer various types of in Produced Liquid;
After each reservoir all pressure break, carry out each post-fracturing reservoir closing layer mining and measuring the volume of total fluid production of output. At this moment, comprise kind difference but being mutually mixed in the wellbore by the liquid of pressure break reservoir from each of the identical chemical tracer of concentration, make because mutually diluting missing dose of concentration in wellbore fluid of various chemistry be below accordingly by the concentration in pressure break reservoir liquid. The degree that concentration is diluted then with each reservoir Liquid output existence function relation, therefore, the new concentration of various chemical tracers in detection wellbore fluid, just can determine the Liquid output ratio of each reservoir in conjunction with original content.
In concrete detection Produced Liquid, the method for the concentration of chemical tracer is prior art.
Step 103: calculate the Liquid output ratio of the different reservoir of described coal bed gas well according to the concentration of chemical tracer various types of in Produced Liquid, calculate the Liquid output of different reservoir in conjunction with total fluid production.
Calculate the ratio between various chemical tracing agent concentration, using the concentration proportion of the various types of chemical tracer ratio as corresponding each reservoir Liquid output.
The concentration proportion of various types of chemical tracer is as follows as the principle of the ratio of corresponding each reservoir Liquid output:
In known all reservoirs, the concentration of of the fracturing fluid corresponding chemical tracer is all identical, is set to Cmg/L, it is assumed that the chemical tracer injected in A reservoir is A1, and the Liquid output of this layer is A2L, and in the Produced Liquid recorded, the concentration of A1 is A3mg/L; The chemical tracer injected in B reservoir is B1, and the Liquid output of this layer is B2L, and in the Produced Liquid recorded, the concentration of B1 is B3mg/L;... the chemical tracer injected in n-th layer reservoir is N1, and Liquid output is N2L, and in the Produced Liquid recorded, the concentration of N1 is N3mg/L.
Then can obtain:
A3=(A2*C)/(A2+B2+ ...+N2)
B3=(B2*C)/(A2+B2+ ...+N2)
Then A layer with the ratio of the Liquid output of B layer is:
A2/B2=A3/B3
In like manner can calculate the ratio obtained between other reservoir Liquid output.
That is: the ratio of each reservoir Liquid output is equal to the ratio of the corresponding chemical tracer concentration recorded in Produced Liquid.
After the ratio drawing each reservoir Liquid output, calculate the Liquid output of different reservoir in conjunction with total fluid production. The Liquid output of different reservoir or its ratio can be used to evaluate reservoir fracturing effect.
That is:, when closing layer mining after separate stratum fracfturing, certain reservoir Liquid output is big, illustrates that this lamination is provided that bigger production capacity after splitting, and namely fracturing effect is better.
The method of the current present invention has been protected 1-01 and has been carried out testing and obtaining successfully in 5 well pressure breaks in Baode area, Shanxi. In test two coal seam sections (8+9# and 4+5# coal seam) are carried out separate stratum fracfturing, 8+9# coal seam has been filled with tracer NaNO by fracturing process respectively3, 4+5# coal seam is filled with tracer NH4SCN. Being detected by the concentration of two kinds of tracers in the mining water to this well, result is as shown in table 1 below:
Table 1 is protected 1-01 and is analyzed result table to tracer concentration in 5 well recovered waters
Table 1 analyzes result table for protecting 1-01 to tracer concentration in 5 well recovered waters, can be seen that according to data in table 1, protect 1-01 and mainly contain tracer NaNO3 in the recovered water of 5 wells, contain only the tracer NH4SCN of trace, the recovered water mainly output from 8+9# coal seam of this well is described, and 4+5# coal seam is substantially free of liquid extraction. Namely 8+9# coal bed fracturing is effective and 4+5# coal bed fracturing weak effect.
The foregoing is only presently preferred embodiments of the present invention, be not intended to limit protection scope of the present invention. All make within the spirit and principles in the present invention any amendment, equivalent replacement, improvement etc., be all contained in protection scope of the present invention.
Claims (4)
1. the method for the Liquid output of the different reservoir measuring coal bed gas well, it is characterised in that the method includes:
When each reservoir of coal bed gas well is carried out separate stratum fracfturing, the fracturing fluid of different reservoirs adds different types of a kind of chemical tracer, and in the fracturing fluid of different reservoir, the concentration of chemical tracer is identical;
Carry out each post-fracturing reservoir closing layer mining, measure total fluid production and detect the concentration of chemical tracer various types of in Produced Liquid;
Concentration according to chemical tracer various types of in Produced Liquid calculates the Liquid output ratio of the different reservoir of described coal bed gas well, calculates the Liquid output of different reservoir in conjunction with total fluid production;
Wherein, the mode of the Liquid output ratio that the described concentration according to chemical tracer various types of in Produced Liquid calculates the different reservoir of described coal bed gas well is: using the concentration proportion of the various types of chemical tracer ratio as corresponding each reservoir Liquid output.
2. method according to claim 1, it is characterised in that described add different types of a kind of chemical tracer in the fracturing fluid of different reservoirs, and in the fracturing fluid of different reservoir, the concentration of chemical tracer is identical includes:
To a reservoir, chemical tracer corresponding for this reservoir is added in prepad fluid and the load fluid of this reservoir fracturing liquid, and the of the fracturing fluid prepad fluid of different reservoir is identical with the concentration of chemical tracer in load fluid.
3. method according to claim 1, it is characterized in that, described when each reservoir of coal bed gas well is carried out separate stratum fracfturing, the fracturing fluid of different reservoirs adds different types of chemical tracer, and in the fracturing fluid of different reservoir, the concentration of chemical tracer is identical includes:
For a reservoir, being added by chemical tracer corresponding for this reservoir in the fracturing fluid of this reservoir in advance, when this reservoir is carried out pressure break, employing has added the fracturing fluid of chemical tracer;
Or,
For a reservoir, first by the independent wiring solution-forming of chemical tracer corresponding for this reservoir, when this reservoir is carried out pressure break, chemical tracing agent solution corresponding for this reservoir and fracturing fluid are injected in this reservoir by a certain percentage.
4. method according to claim 1, it is characterised in that described chemical tracer is selected from: NaNO3、NH4SCN、NH4NO3、KNO3、KI。
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103603655B (en) * | 2013-10-12 | 2016-08-31 | 中国石油天然气股份有限公司 | Tracer and the monitoring method of discharge opeing is returned for monitoring multistage fracturing |
| CN104453863A (en) * | 2014-11-14 | 2015-03-25 | 天津大港油田滨港集团博弘石油化工有限公司 | Sulfate tracer agent for tertiary oil recovery and preparation method of sulfate tracer agent |
| CN106401552A (en) * | 2016-11-02 | 2017-02-15 | 中国石油化工股份有限公司 | Post-fracture flow-back tracking detecting method for horizontal well |
| CN108729909A (en) * | 2018-06-01 | 2018-11-02 | 青岛大地新能源技术研究院 | A method of utilizing Uranium determination agent level monitoring well staged fracturing effect |
| CN110924926B (en) * | 2018-09-04 | 2022-08-02 | 中国石油天然气股份有限公司 | Method and apparatus for wellbore-based ion concentration determination |
| CN110374583A (en) * | 2019-04-09 | 2019-10-25 | 延安顺盈石油工程技术服务有限公司 | A kind of oil field oil water gas well indicator tracking evaluating production capacity method |
| CN111005714B (en) * | 2019-11-28 | 2023-02-28 | 中国海洋石油集团有限公司 | Method for monitoring oil well yield by using tracer |
| CN115155432A (en) * | 2022-08-22 | 2022-10-11 | 陕西山秦能源技术服务有限公司 | Preparation process and equipment of reservoir transformation agent |
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| CN101421490A (en) * | 2006-02-21 | 2009-04-29 | 贝克休斯公司 | A method and apparatus for ion-selective discrimination of fluids downhole |
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