CN109707373B - Horizontal well-vertical well bidirectional tracing method based on fluid production profile test and inter-well tracing - Google Patents

Horizontal well-vertical well bidirectional tracing method based on fluid production profile test and inter-well tracing Download PDF

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CN109707373B
CN109707373B CN201811545014.6A CN201811545014A CN109707373B CN 109707373 B CN109707373 B CN 109707373B CN 201811545014 A CN201811545014 A CN 201811545014A CN 109707373 B CN109707373 B CN 109707373B
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horizontal well
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CN109707373A (en
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景成
王强
林加恩
谷潇雨
董珍珍
何延龙
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Xian Shiyou University
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Abstract

The invention discloses a horizontal well-vertical well bidirectional tracing method based on liquid production profile testing and interwell tracing, which is suitable for a combined injection and production well pattern of vertical well water injection and horizontal well production, and comprises the following contents: screening a slow-release tracer and an interwell tracer according to information such as the condition of a horizontal well, the characteristics of formation water and the like; adopting a slow-release tracer profile measuring device matched with the target horizontal well to lower the slow-release tracer to a horizontal section; collecting effective chemical components of the slow-release tracer at a horizontal well mouth so as to obtain the liquid production information of each testing section of the horizontal well; injecting the interwell tracer into the stratum through the water injection well, and collecting the content of the interwell tracer at the horizontal well mouth; by combining the slow-release tracer and the inter-well tracer, the liquid production information of each section of the horizontal well and the water channeling direction in the whole well network are accurately described finally. The method can simultaneously obtain the horizontal well liquid production profile and the cross flow channel between wells, and has the advantages of real-time monitoring, dynamic adjustment, economy and high efficiency.

Description

Horizontal well-vertical well bidirectional tracing method based on fluid production profile test and inter-well tracing
Technical Field
The invention belongs to the technical field of horizontal well tracing and water finding methods, and relates to a horizontal well-vertical well bidirectional tracing method based on fluid production profile testing and inter-well tracing.
Background
The occupation ratio of the compact oil in the recoverable petroleum resources in China is up to more than 40 percent, and the compact oil is an important succesive force of the oil and gas resources in China. Horizontal well (volume fracturing) + vertical well combined well pattern water injection are important development means of compact oil in China at present, and only the Changqing compact oil area in the Ordos basin reaches hundreds of well groups, so that a remarkable development effect is obtained in the early stage. However, the geological conditions of compact oil in China are complex, reservoirs are often accompanied by complex and changeable dominant and recessive natural fractures, a plurality of artificial fractures formed after a horizontal well is fractured in a large scale are communicated with the natural fractures, and the common water channeling and flooding of the horizontal well are caused in the middle and later stages of water injection development. The complex crack channeling system formed between the horizontal well and the vertical well causes that the main water incoming direction on the plane and the water production position information of the horizontal well horizontal section on the section are extremely difficult to obtain, and the subsequent comprehensive water control measures such as water plugging, water blocking, water regulation and flooding and production optimization are difficult to effectively implement.
At present, aiming at the inter-well tracing monitoring technology between a water injection well and a development well, the technology can be used for the aspects of identification of water incoming directions, identification and characterization of inter-well channeling channels and the like, a downhole testing instrument is not needed, a small amount of tracer slugs are injected into the water injection well, the inter-well information can be obtained only through periodic sampling, analyzing and explaining from a production well mouth, and the technology is widely applied to oil fields at home and abroad. In recent years, the slow-release tracer developed abroad has made a certain breakthrough and progress in the aspect of horizontal well fluid production profile testing, and is successfully applied to a plurality of foreign oil fields. However, both the inter-well tracing monitoring technology and the slow-release tracer technology have their own limitations, and continuous monitoring of a horizontal well section fluid production profile, identification of an incoming water direction and quantitative characterization of an inter-well water channeling fracture system cannot be realized by using a single technology.
Disclosure of Invention
Aiming at the defects of the existing tracing technology, the invention provides a horizontal well-vertical well bidirectional tracing method based on fluid production profile testing and inter-well tracing, which is suitable for vertical well water injection and well patterns for horizontal well production.
The technical scheme adopted by the invention is as follows:
a horizontal well-vertical well bidirectional tracing method based on liquid production profile testing and interwell tracing is suitable for a vertical well water injection and horizontal well production well pattern and comprises the following steps:
s1, selecting a tracer:
dividing the horizontal well into a corresponding number of test sections according to the number of the perforation sections of the horizontal well, wherein each perforation section corresponds to one test section, and each test section selects one oil-soluble slow-release tracer and one water-soluble slow-release tracer; the oil-soluble slow-release tracers selected by the test sections are different from each other, and the water-soluble slow-release tracers are different from each other;
determining the interwell tracers used by the water injection wells according to the oil reservoir characteristics, the formation fluid characteristics, the formation water ion conditions, the rock characteristics, the water quality of the water injection wells and the water injection quantity of the water injection wells, wherein the interwell tracers used by the water injection wells are different;
the selected oil-soluble slow-release tracer and water-soluble slow-release tracer are different from the well-to-well tracer used in each water injection well;
s2, adding a slow-release tracer:
calculating the usage amount of the oil-soluble slow-release tracer and the water-soluble slow-release tracer according to the liquid production amount and the test period of the horizontal well;
correspondingly adding an oil-soluble slow-release tracer and a water-soluble slow-release tracer at each test section of the horizontal well;
s3, collecting a slow-release tracer sample:
after the horizontal well is normally produced, periodically sampling at a wellhead of the horizontal well in the effective period of the oil-soluble slow-release tracer and the water-soluble slow-release tracer, determining the content of effective chemical components of each slow-release tracer in a sample, determining the liquid production condition of each section of the horizontal well according to the measured content, and drawing a liquid production profile of the horizontal well based on the liquid production condition;
s4, interwell tracer:
according to the production condition of the horizontal well and the horizontal well liquid production profile acquired by S3, when the variation amplitude of the whole water yield of the horizontal well or the water yield of any test section in a preset time period exceeds a preset value, calculating the using amount of the inter-well tracer, and injecting the inter-well tracer selected by S1 into the stratum through each water injection well;
s5, collecting the slow-release tracer and the interwell tracer:
collecting a produced liquid at a wellhead of the horizontal well, and determining the content of effective chemical components of each slow-release tracer in the produced liquid and the content of the tracer among wells;
s6, horizontal well-vertical well bidirectional tracing explanation:
and respectively determining the specific water breakthrough position of the horizontal section of the horizontal well and the water inflow direction between wells according to the effective chemical component content of each slow-release tracer and the content of the tracer between wells in the produced liquid measured by S5, and mutually combining the specific water breakthrough position of the horizontal section and the water inflow direction between wells to describe the oil production information and the water production information of each section of the horizontal well and the water channeling direction in the whole well network.
The horizontal well-vertical well is a five-point method horizontal well-vertical well combined injection-production well pattern.
The effective release period of the oil-soluble slow-release tracer and the water-soluble slow-release tracer adopted in S1 is more than 2 years.
The effective chemical components of the oil-soluble slow-release tracer and the water-soluble slow-release tracer adopted in S1 are chemical tracers.
And S2, calculating the using amount of the slow-release tracer according to the liquid production amount and the test period of the horizontal well, wherein the slow-release tracer is a slender round bar type, the size of a single round bar is fixed, and the calculation formula is as follows:
G=50*M*Q/(S*V)
in the formula:
g is the dosage of the tracer, and the unit is number;
m-tracer detection sensitivity in parts per billion;
q-daily liquid production per well in m3
S-the external surface area of a single slow-release tracer, in cm2
V-slow release tracer agent unit area slow release speed, unit is mg/(d x cm)2)。
And S3, collecting 50ml of sample at the wellhead of the horizontal well, and detecting the content of the effective chemical components of each slow-release tracer in the sample by using inductively coupled plasma mass spectrometry.
The preset time period in S4 is 1 month, and the preset value is 20%.
And S6, the content of the effective chemical components of each slow-release tracer in the produced liquid is the average value of the time period from the injection of the interwell tracer to the end of monitoring.
Compared with the prior art, the invention has the following beneficial effects:
the horizontal well-vertical well bidirectional tracing method based on the liquid production profile test and the inter-well tracing adopts the slow-release tracer to measure the liquid production profile information of the horizontal well, adopts the inter-well tracing method to determine the water channeling direction, combines the two technologies, solves the problem that the slow-release tracer technology can only measure the liquid production profile of the horizontal well and can not determine the inter-well water channeling direction, and solves the problem that the inter-well tracing technology can only determine the water channeling direction and can not determine the specific output position of the injected water in the horizontal well; the horizontal well-vertical well bidirectional tracing method based on the liquid production profile test and the inter-well tracing organically combines the advantages of a slow-release tracer horizontal well liquid production profile measuring technology and an inter-well tracing technology, and provides a set of method which is based on the slow-release tracer and the inter-well tracer and can accurately describe the specific water breakthrough position of a horizontal well and the water channeling direction in the whole well network; in conclusion, the method can simultaneously obtain the horizontal well fluid production section and the cross flow channel between wells, and has the advantages of real-time monitoring, dynamic adjustment, economy and high efficiency.
Drawings
Fig. 1 is a schematic diagram of a horizontal well-vertical well bidirectional tracing method based on fluid production profile testing and interwell tracing in the embodiment of the invention.
In the figure, 1 is a vertical water injection well I, 2 is a vertical water injection well II, 3 is a vertical water injection well III, 4 is a vertical water injection well IV, 5 is a horizontal well, 5-1 is a horizontal well heel, 5-2 is a horizontal well toe, 6 is a slow-release type tracer measuring section I, 7 is a slow-release type tracer measuring section II, 8 is a slow-release type tracer measuring section III, 9 is a slow-release type tracer measuring section IV, 10 is a slow-release type tracer measuring section V.
Detailed Description
The present invention is described in detail below with reference to the following embodiments and the attached drawings, and it should be noted that the embodiments are only an implementation method of the present invention for specific situations, and do not limit the present invention in any way, and any simple modifications, changes and other changes made according to the technical spirit of the present invention are within the protection scope of the present invention.
As shown in the attached figure 1, the horizontal well-vertical well bidirectional tracing method based on fluid production profile testing and interwell tracing is suitable for a well pattern of vertical well water injection and horizontal well production, and comprises the following steps:
s1, selecting a tracer:
dividing the horizontal well into a corresponding number of test sections according to the number of the perforation sections of the horizontal well, wherein each perforation section corresponds to one test section, and each test section selects one oil-soluble slow-release tracer and one water-soluble slow-release tracer; the oil-soluble slow-release tracers selected by the test sections are different from each other, and the water-soluble slow-release tracers are different from each other;
determining the interwell tracers used by the water injection wells according to the oil reservoir characteristics, the formation fluid characteristics, the formation water ion conditions, the rock characteristics, the water quality of the water injection wells and the water injection amount of the water injection wells, wherein the interwell tracers used by the water injection wells are different from one another;
the selected oil-soluble slow-release tracer and water-soluble slow-release tracer are different from the well-to-well tracer used in each water injection well;
s2, adding a slow-release tracer:
calculating the usage amount of the oil-soluble slow-release tracer and the water-soluble slow-release tracer according to the liquid production amount and the test period of the horizontal well; wherein, the calculation formula is:
G=50*M*Q/(S*V)
in the formula:
g is the dosage of the tracer, and the unit is number;
m-tracer detection sensitivity in parts per billion (ppb);
q-daily liquid production per well in m3
S-external surface area of single slow-release tracer, unit is cm2
V-slow release type tracer agent unit area slow release speed, unit ismg/(d*cm2)。
The slow-release tracer is in a slender round bar shape, and the size of a single round bar is fixed, so the number of the used slow-release tracer round bars is calculated;
correspondingly adding an oil-soluble slow-release tracer and a water-soluble slow-release tracer at each test section of the horizontal well according to the sectional condition of the horizontal well; when the slow-release tracer is put in, an applicable screen pipe type, sleeve shooting hole type and other slow-release tracer horizontal well liquid production profile measuring device can be selected according to the well type (the device adopts a sleeve shooting horizontal well liquid production profile testing device, a production testing integrated pipe column and a testing method, application number 201811315258.5), wherein the used slow-release tracer horizontal well liquid production profile measuring device has the characteristics of only producing along with the fluid of a tested well section, not being influenced by the fluid of other well sections, and not influencing the normal production and testing of other well sections.
S3, collecting a slow-release tracer sample:
after the horizontal well is normally produced, periodically sampling at a wellhead of the horizontal well in the effective period of the oil-soluble slow-release tracer and the water-soluble slow-release tracer, determining the content of effective chemical components of each slow-release tracer in a sample, determining the liquid production condition of each section of the horizontal well according to the measured content, and drawing a liquid production profile of the horizontal well based on the liquid production condition;
s4, interwell tracer:
according to the production condition of the horizontal well and the horizontal well liquid production profile acquired by S3, when the variation amplitude of the whole water production of the horizontal well or the water production of any test section in a preset time period (the preset time period is generally 1 month) exceeds a preset value (the preset value is generally 20%), calculating the using amount of the inter-well tracer, and injecting the inter-well tracer selected by S1 into the stratum through each water injection well;
s5, collecting the slow-release tracer and the interwell tracer:
collecting a produced liquid at a wellhead of the horizontal well, and determining the content of effective chemical components of each slow-release tracer in the produced liquid and the content of the tracer among wells;
s6, horizontal well-vertical well bidirectional tracing explanation:
and respectively determining the specific water breakthrough position of the horizontal section of the horizontal well and the water inflow direction between wells according to the effective chemical component content of each slow-release tracer and the content of the tracer between wells in the produced liquid measured by S5, and mutually combining the specific water breakthrough position of the horizontal section and the water inflow direction between wells to describe the oil production information and the water production information of each section of the horizontal well and the water channeling direction in the whole well network.
The horizontal well-vertical well bidirectional tracing method based on the liquid production profile test and the inter-well tracing can be applied to a five-point method horizontal well-vertical well combined injection and production well pattern.
In the present invention, the effective release period of the oil-soluble slow-release tracer and the water-soluble slow-release tracer used in S1 is 2 years or more. The oil-soluble slow-release tracer and the water-soluble slow-release tracer used in S1 have chemical tracers as effective chemical components. In S3, 50ml of sample is collected at the wellhead of the horizontal well, and ICP-MS (inductively coupled plasma mass spectrometry) is adopted to detect the content of the effective chemical components of each slow-release tracer in the sample.
Examples
The horizontal well-vertical well bidirectional tracing method based on the liquid production profile test and the interwell tracing is applied to a five-point method well pattern of horizontal well development-vertical well water injection, and the horizontal well-vertical well bidirectional tracing based on the liquid production profile test and the interwell tracing is carried out, and comprises the following steps:
s1 selection of tracer
As shown in fig. 1, the horizontal well 5 has 5 perforation sections, the horizontal well 5 is correspondingly divided into 5 test sections, the 5 test sections are respectively a slow-release tracer measurement section I6, a slow-release tracer measurement section II7, a slow-release tracer measurement section III8, a slow-release tracer measurement section IV9 and a slow-release tracer measurement section V10, 5 oil-soluble slow-release tracers and 5 water-soluble slow-release tracers used in the 5 test sections of the horizontal well are determined, each test section corresponds to one oil-soluble slow-release tracer and one water-soluble slow-release tracer, and the oil-soluble slow-release tracers selected in the 5 test sections are different from each other and the water-soluble slow-release tracers are different from each other; 4 kinds of inter-well tracers used by a vertical water injection well I1, a vertical water injection well II2, a vertical water injection well III3 and a vertical water injection well IV4 are determined according to the oil reservoir characteristics, the stratum fluid characteristics, the stratum water ion condition, the rock characteristics, the water quality of the water injection well and the water injection amount of the water injection well, the 4 kinds of selected inter-well tracers are different trace element tracers, and each vertical water injection well corresponds to one kind of inter-well tracers; the selected 5 oil-soluble slow-release tracers, 5 water-soluble slow-release tracers and 4 interwell tracers selected by 4 vertical water injection wells are different from each other.
S2 inserting slow-release tracer
According to the liquid production amount and the test period of the horizontal well 5, the usage amount of 5 slow-release tracers used in 5 test sections of the horizontal well 5 is calculated, and the calculation formula is as follows:
G=50*M*Q/(S*V)
the detection sensitivity M of the slow-release tracer is 1 ppb; the daily liquid production Q of a single well is 100m3(ii) a The slow-release tracer is in the shape of strip, the diameter of the slow-release tracer is 2cm, the length of the slow-release tracer is 100cm, and the external surface area S of the slow-release tracer is 1256cm2(ii) a The unit area slow release speed V of the slow release type tracer agent is 0.1mg/(d x cm)2). And calculating 40 dosage G of the slow-release tracer used in a single test section.
Respectively putting 5 oil-soluble slow-release tracers and 5 water-soluble slow-release tracers into a slow-release tracer measuring section I6, a slow-release tracer measuring section II7, a slow-release tracer measuring section III8, a slow-release tracer measuring section IV9 and a slow-release tracer measuring section V10 of the horizontal well 5, selecting a slow-release tracer release device suitable for casing perforation completion during putting, wherein the selected slow-release tracer release device has the characteristics of only producing along with fluids of a tested well section, not being influenced by fluids of other well sections, and not influencing normal production and testing of other well sections.
S3, collecting slow-release tracer sample
After the horizontal well 5 is normally produced, sampling is performed at the wellhead of the horizontal well 5 regularly, the sampling period is 3 days, the content of effective chemical components of each slow-release tracer in the sample is determined, so that the oil production and water production conditions of a slow-release tracer measuring section I6, a slow-release tracer measuring section II7, a slow-release tracer measuring section III8, a slow-release tracer measuring section IV9 and a slow-release tracer measuring section V10 in the horizontal well 5 are determined, and a liquid production profile of the horizontal well 5 is drawn based on the liquid production condition.
S4 tracer used between injection wells
According to the production condition of the horizontal well 5 and the liquid production information of the 5 testing sections of the horizontal well 5 measured based on the slow-release tracer, the water yield of the slow-release tracer measuring section IV9 of the horizontal well 5 is increased by 30% within 1 month, the use amounts of the 4 kinds of inter-well tracers are calculated to be 10kg, then the 4 kinds of trace element inter-well tracers selected by the S1 are injected into the stratum respectively through a vertical water injection well I1, a vertical water injection well II2, a vertical water injection well III3 and a vertical water injection well IV4, and the water injection speed is a daily injection speed of 80m3/d。
S5, collecting the slow-release tracer and the interwell tracer:
collecting a produced liquid at a wellhead of the horizontal well, and determining the content of effective chemical components of each slow-release tracer in the produced liquid and the content of the tracer among wells;
s6, explanation of horizontal well-vertical well bidirectional tracing:
in the period from the injection of the interwell tracer to the completion of monitoring, 5 water-soluble slow-release tracers are detected, the average value of the content of effective chemical components of each slow-release tracer is obtained, and the detection results are that the water yields of the slow-release tracer measuring section I6, the slow-release tracer measuring section II7, the slow-release tracer measuring section III8, the slow-release tracer measuring section IV9 and the slow-release tracer measuring section V10 account for 0%, 5%, 80% and 15% of the total water yield of the horizontal well 5 respectively.
By detecting 4 kinds of interwell tracers through S5 and analyzing the recovery rate of the 4 kinds of interwell tracers, the water production of the horizontal well 5 comes from the vertical water injection well I1, the vertical water injection well II2, the vertical water injection well III3 and the vertical water injection well IV4 in proportions of 10%, 60%, 25% and 5% respectively.
It is shown that the slow release type tracer measurement section IV9 from the water injection well II2 to the horizontal well 5 is the first main direction of water channeling, and the slow release type tracer measurement section IV9 from the water injection well III3 to the horizontal well 5 is the second main direction of water channeling.
Based on the information, the liquid production condition of each section of the horizontal well can be determined, and the water channeling direction in the vertical well-horizontal well combined injection and production well network can be determined.

Claims (7)

1. A horizontal well-vertical well bidirectional tracing method based on fluid production profile testing and inter-well tracing is characterized in that the method is suitable for a well pattern of vertical well water injection and horizontal well production, and comprises the following steps:
s1, selecting a tracer:
dividing the horizontal well into a corresponding number of test sections according to the number of the perforation sections of the horizontal well, wherein each perforation section corresponds to one test section, and each test section selects one oil-soluble slow-release tracer and one water-soluble slow-release tracer; the oil-soluble slow-release tracers selected by the test sections are different from each other, and the water-soluble slow-release tracers are different from each other;
determining the interwell tracers used by the water injection wells according to the oil reservoir characteristics, the formation fluid characteristics, the formation water ion conditions, the rock characteristics, the water quality of the water injection wells and the water injection quantity of the water injection wells, wherein the interwell tracers used by the water injection wells are different;
the selected oil-soluble slow-release tracer and water-soluble slow-release tracer are different from the well-to-well tracer used in each water injection well;
s2, adding a slow-release tracer:
calculating the usage amount of the oil-soluble slow-release tracer and the water-soluble slow-release tracer according to the liquid production amount and the test period of the horizontal well;
correspondingly adding an oil-soluble slow-release tracer and a water-soluble slow-release tracer at each test section of the horizontal well;
s3, collecting a slow-release tracer sample:
after the horizontal well is normally produced, periodically sampling at a wellhead of the horizontal well in the effective period of the oil-soluble slow-release tracer and the water-soluble slow-release tracer, determining the content of effective chemical components of each slow-release tracer in a sample, determining the liquid production condition of each section of the horizontal well according to the measured content, and drawing a liquid production profile of the horizontal well based on the liquid production condition;
s4, interwell tracer:
according to the production condition of the horizontal well and the horizontal well liquid production profile acquired by S3, when the variation amplitude of the whole water yield of the horizontal well or the water yield of any test section in a preset time period exceeds a preset value, calculating the using amount of the inter-well tracer, and injecting the inter-well tracer selected by S1 into the stratum through each water injection well;
s5, collecting the slow-release tracer and the interwell tracer:
collecting a produced liquid at a wellhead of the horizontal well, and determining the content of effective chemical components of each slow-release tracer in the produced liquid and the content of the tracer among wells;
s6, horizontal well-vertical well bidirectional tracing explanation:
respectively determining the specific water breakthrough position of the horizontal section of the horizontal well and the water inflow direction between wells according to the effective chemical component content of each slow-release tracer and the content of the tracer between wells in the produced liquid measured by S5, and mutually combining the specific water breakthrough position of the horizontal section and the water inflow direction between wells to describe the oil production information, the water production information and the water channeling direction in the whole well network of each section of the horizontal well;
in S6, the content of effective chemical components of each slow-release tracer in the produced liquid is the average value of the time period from the injection of the tracer between wells to the end of monitoring.
2. The horizontal well-vertical well bidirectional tracing method based on the fluid production profile test and the interwell tracing is characterized in that the horizontal well-vertical well is a five-point method horizontal well-vertical well combined injection and production well pattern.
3. The horizontal well-vertical well bidirectional tracing method based on the fluid production profile test and the inter-well tracing as claimed in claim 1, wherein the effective release period of the oil-soluble slow-release tracer and the water-soluble slow-release tracer adopted in S1 is more than 2 years.
4. The horizontal well-vertical well bidirectional tracing method based on the production profile test and the interwell tracing as claimed in claim 1, wherein the effective chemical components of the oil-soluble slow-release type tracer and the water-soluble slow-release type tracer adopted in S1 are chemical tracers.
5. The horizontal well-vertical well bidirectional tracing method based on the fluid production profile test and the inter-well tracing is characterized in that in S2, the dosage of the slow-release tracer is calculated according to the fluid production amount and the test period of the horizontal well, wherein the slow-release tracer is in a long and thin round bar shape, the size of a single round bar is fixed, and the calculation formula is as follows:
G=50*M*Q/(S*V)
in the formula:
g is the dosage of the tracer, and the unit is the number;
m-tracer detection sensitivity in billions;
q-daily liquid production per well in m3
S-the external surface area of a single slow-release tracer, in cm2
V-slow release type tracer agent unit area slow release speed, unit is mg/(d x cm)2)。
6. The horizontal well-vertical well bidirectional tracing method based on the production profile test and the inter-well tracing is characterized in that 50ml of samples are collected at the wellhead of a horizontal well in S3, and the content of effective chemical components of each slow-release tracer in the samples is detected by inductively coupled plasma mass spectrometry.
7. The horizontal well-vertical well bidirectional tracing method based on fluid production profile testing and interwell tracing as claimed in claim 1, wherein the preset time period in S4 is 1 month, and the preset value is 20%.
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