CN116044366B - Long-acting tracing real-time monitoring method for perforation, fracturing and production stages of oil and gas reservoir - Google Patents
Long-acting tracing real-time monitoring method for perforation, fracturing and production stages of oil and gas reservoir Download PDFInfo
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- CN116044366B CN116044366B CN202211695892.2A CN202211695892A CN116044366B CN 116044366 B CN116044366 B CN 116044366B CN 202211695892 A CN202211695892 A CN 202211695892A CN 116044366 B CN116044366 B CN 116044366B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
- E21B43/267—Methods for stimulating production by forming crevices or fractures reinforcing fractures by propping
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/11—Perforators; Permeators
- E21B43/119—Details, e.g. for locating perforating place or direction
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
Abstract
The application discloses a long-term tracking real-time monitoring method for perforation, fracturing and production stages of an oil and gas reservoir, belongs to the technical field of dynamic monitoring of oil and gas reservoirs, and solves the problems that the conventional tracer monitoring technology cannot realize long-term dynamic monitoring of the whole process of perforation, fracturing and production stages, and is low in operation efficiency and complex in construction flow. The application comprises the following steps: step 1: preparing perforation; step 2: perforating the first interval by adopting a hydraulic sand blaster, wherein the sand blasting liquid comprises a mixture of quartz sand and a long-acting tracer proppant; step 3: after perforation, fracturing is carried out by using a fracturing fluid containing a long-acting tracer propping agent; step 4: repeating the steps 2 and 3 to complete perforation and fracturing of the remaining intervals and realize unique calibration of oil or gas produced by each interval; and (3) finishing tracer collection, detection and analysis in perforation, fracturing and production stages through a ground collection/analysis device, and obtaining productivity data of each layer section of the oil-gas well. The application realizes the long-term dynamic monitoring of the whole process of perforation, fracturing and production.
Description
Technical Field
The application relates to the technical field of petroleum exploitation, in particular to a method for monitoring perforation, fracturing and production stage long-acting tracking of an oil and gas reservoir in real time.
Background
In the past, how to economically and efficiently obtain production data of each reservoir section of an oil and gas well is the key point of research of various large oil fields, and conventional mechanical logging cannot effectively obtain the production data of each section of the oil and gas well due to the limitation of the following factors: (1) cannot withstand downhole high temperature/acidic environments; (2) The equipment cannot be accurately placed in a preset test position under the condition of a highly inclined well/a horizontal well; (3) the cost of a single operation is high, etc. For this purpose, a tracer monitoring technology has been proposed, which has been applied to dynamic monitoring of oil and gas wells in various large oil fields in recent years, without requiring a test tool, and according to different monitoring fluids, such as oil, gas and water, a unique identification tracer is injected into each fracturing segment along with fracturing fluid, and sampling and detection are performed in flowback and production stages, so that the production contribution of the oil, gas and water in each segment is quantitatively determined. The tracing monitoring technology can accurately acquire production data of each section of the oil and gas well, and has important guiding significance for measures such as oil and gas reservoir fine description, development dynamic monitoring, development process adjustment and the like.
However, conventional tracer monitoring can only be injected in a fracturing stage, the monitoring of the whole process of perforation, fracturing and production stages cannot be realized, and the liquid phase tracer is adopted, so that the monitoring time is short, and the long-term monitoring requirement is not met; the tracer for monitoring the multi-stage fracturing flowback fluid and a monitoring method (CN 103603655B) disclose a tracer for monitoring the multi-stage fracturing flowback fluid, wherein the method only realizes tracer monitoring in the fracturing stage and is a conventional liquid-phase tracer, and the monitoring period is not more than 1 year; the method for monitoring the effect and the productivity of the oil well after the layering or the staged fracturing by using the tracer is also only aimed at monitoring the fracturing stage; meanwhile, the conventional tracing monitoring needs manual sampling, and the sampling frequency is low; after sampling, the sample is required to be sent to a special laboratory for analysis, the waiting time for test analysis is long, and the sampling is influenced by human factors. Thus, there is a need for improvements over existing trace monitoring techniques.
Disclosure of Invention
Aiming at the problems in the prior art, the application provides a long-acting tracing real-time monitoring method for perforation, fracturing and production stages of an oil and gas reservoir, which aims at solving the problem that the prior tracing monitoring technology can not realize dynamic monitoring of the whole process of perforation, fracturing and production stages; the construction process is complex and the efficiency is low; the monitoring time is short, dynamic monitoring cannot be continuously carried out, and the problems of long-term monitoring requirements of oil and gas wells and the like are not met.
The application is realized by the following technical scheme:
the method for monitoring perforation, fracturing and production stage long-acting tracking of the oil and gas reservoir in real time comprises the following steps:
step 1: preparing work before perforation;
step 2: first interval perforation
Perforating the first layer section by adopting a hydraulic sand blaster, wherein sand blasting liquid adopted by the hydraulic sand blaster comprises a mixture of quartz sand and a long-acting tracer propping agent, the long-acting tracer propping agent is inert and does not react with the quartz sand, and fluorescent light with different specific wavelengths can be emitted through excitation of a laser generator, so that identification and detection of tracer agents with different types are realized;
step 3: fracturing the first layer after perforation
After the primary perforation is completed, fracturing treatment is carried out by adopting fracturing fluid containing a long-acting tracer propping agent, a shaft is cut and polished by adopting a high-speed jet mode by adopting sand blasting fluid, a perforation channel is formed, and the long-acting tracer propping agent further extends and supports cracks to form a stable flow channel;
step 4: after the primary perforation and fracturing are completed, the lifting pipe column is dragged to the next position of the perforation section, perforation and fracturing steps are repeated, perforation and fracturing of different layers are completed, unique calibration of oil or gas produced by each layer is realized, sand blasting liquid matched with the layer is adopted during perforation, and a long-acting tracer propping agent matched with the layer is adopted during fracturing;
and collecting stratum fluid injected with the long-acting tracer propping agent in the perforation stage, the fracturing stage and the subsequent production stage, and carrying out real-time detection and online analysis on the collected stratum fluid, so that the change condition of the tracer in the stratum fluid produced in the perforation stage, the fracturing stage and the subsequent production stage can be respectively obtained, and the productivity of each stage is evaluated.
The application considers the importance of collecting data in the whole oil gas exploitation process, but the current tracer monitoring technology does not realize the dynamic monitoring of the whole process of the perforation stage, the fracturing stage and the subsequent production stage, and greatly discounts the data accumulation and the efficiency, so the application designs a hydraulic sand blasting perforation lengthening and effective tracer proppant monitoring method integrating perforation, fracturing and oil gas well production dynamic monitoring, the method adopts a mixture containing quartz sand and a long-acting tracer proppant as sand blasting liquid during hydraulic sand blasting perforation, the tracer proppant does not react with the quartz sand, the tracer injection is realized while the perforation is realized, and the condition is provided for the fluid monitoring produced in the perforation stage; and secondly, injecting a fracturing fluid containing a long-acting tracer propping agent in a fracturing stage, wherein the adopted long-acting tracer propping agent plays a role in fracturing a stratum, supporting and expanding a fracturing crack, optimizes a construction flow to the maximum extent, and saves operation cost, so that the output contribution of each section of an oil-gas well is economically and efficiently obtained, and powerful data support is provided for optimizing an oil field development scheme.
The application discloses a preferable oil and gas reservoir perforation, fracturing and production stage long-acting tracking real-time monitoring method, which comprises the following steps: pre-perforation preparation includes:
step 11: installing a tracer detection and analysis device at a ground pipeline (4);
step 12: selecting a transformation horizon according to reservoir comprehensive evaluation data, and determining perforation positions;
the comprehensive evaluation data of the reservoir comprises high-quality reservoir thickness, permeability, porosity and gas (oil) saturation, and a layer with large reservoir thickness, good pore permeability and high gas (oil) saturation is selected for perforation and fracturing;
step 13: calculating the dosage of the tracer according to the test data of the similar oil-gas well, and selecting the tracer of each layer section;
collecting similar oil and gas well production test data, including single well predicted output, return discharge capacity, the lowest detection limit of the tracer concentration and monitoring period, determining the type and the dosage m of the tracer, wherein the calculation formula (1) of the dosage m of the tracer is as follows:
（1）
wherein:-a dose modification factor;
-a minimum detection limit for tracer concentration;
q-single well predicted production, m 3 /d；
T-monitoring period, d.
The dosage correction coefficient is determined by the predicted yield of the monitoring well, the planned monitoring period and the return discharge capacity together, the dosage m of the tracer in the monitoring well is calculated according to a formula (1), the number of types of the tracer injected is determined according to the number n of fracturing sections (the types of the tracer are in one-to-one correspondence with the fracturing sections), and the types of the tracer used are GT-1-GT-n, wherein n is the number of the fracturing sections.
Step 14: calculating the proportion of quartz sand and long-acting tracer propping agent in sand blasting liquid
The ratio of the quartz sand to the long-acting tracer propping agent influences the perforation efficiency and the seam making scale, and the calculation formulas of the content gamma of the long-acting tracer propping agent and the content s of the quartz sand in each perforation/fracturing section are shown as (2) and (3):
（2）
（3）
wherein:-i th segment long-acting tracer proppant content,%;
a-permeability correction coefficient;
k i average permeability in section i, μm 2 ；
k ji -average permeability of the ith segment, jth cluster, μm 2 ；
B-porosity correction coefficient;
-an i-th segment average porosity;
-the i-th segment, j-th cluster average porosity;
s i -i-th stage quartz sand content,%;
the average value of the permeability and the porosity of each section and each cluster is obtained by logging interpretation data, and the permeability correction coefficient and the porosity correction coefficient are determined according to the flowback speed (the flowback capacity per unit time);
step 15: selecting an adaptive sand blaster according to physical parameters of the layer to be perforated;
physical parameters of the layer to be perforated include lithology and physical properties, including porosity, permeability and stratum stress, and selecting a proper hydraulic sand blaster according to stratum perforation and pressure opening difficulty;
according to the application, the tracer detection and analysis device is arranged at the ground pipeline, so that the produced fluid in the injection hole stage, the fracturing stage and the production stage can be sampled at high frequency, the concentration of the tracer is analyzed in real time, the result is output, and more comprehensive data can be obtained more efficiently.
The application discloses a method for monitoring the perforation, fracturing and production stage long-acting tracking of an oil and gas reservoir in real time, wherein the long-acting tracking proppants in the step 2, the step 3 and the step 4 are divided into a long-acting tracking proppants containing GT-1, a long-acting tracking proppants containing GT-2, a long-acting tracking proppants containing GT-3 and a … … long-acting tracking proppants containing GT-n according to the selection of different layers.
The long-acting tracer propping agent is a core-shell structure formed by the fluorescent tracer and propping agent ceramsite, can be slowly released, and plays a role in long-acting monitoring.
And different long-acting tracer proppants are selected in each interval, and detection and analysis can be carried out according to the long-acting tracer proppants in the formation flowback fluid, so that produced fluid data of different intervals can be obtained.
The application discloses a method for monitoring perforation, fracturing and production stage long-acting tracking of an oil and gas reservoir in real time, which comprises the following specific steps of: and (3) a hydraulic sand blasting perforating string is put into the well bore, the perforating string is adjusted to enable a sand blaster nozzle to be aligned to the perforating position of the layer section, and sand blasting liquid is pumped into the well bore to carry out perforation.
Further, the jet speed during sand blasting perforation is 600-800L/min, and the particle size of quartz sand is 20-40 meshes.
In the step 2, the same interval comprises multiple times of perforation, after one time of perforation is completed, the lifting pipe column is dragged to the next position of the perforating interval, and hydraulic sand blasting perforation is performed again according to the same operation until all perforation of the interval is completed.
The application discloses a method for monitoring perforation, fracturing and production stage long-acting tracking of an oil and gas reservoir in real time, wherein the step 2 further comprises perforation inspection after perforation is completed, the perforation inspection comprises closing a sleeve gate, micro-injection test extrusion is carried out on the perforation layer of the stage, and if continuous injection is possible, the sleeve is already shot.
According to the optimal long-acting tracking real-time monitoring method for the perforation, fracturing and production stages of the oil and gas reservoir, the detection and analysis device comprises a collection and extraction component and an analysis component, the collection and extraction component is connected with the analysis component, the collection and extraction component collects flowback fluid in the perforation stage, the fracturing stage and the production stage in real time, and the analysis component detects and analyzes the flowback fluid in real time, so that productivity conditions of each stage are obtained.
The application discloses a preferable long-acting tracing real-time monitoring method for perforation, fracturing and production stages of an oil and gas reservoir, wherein the detection and analysis device is required to be inspected before use, and the specific inspection method comprises the following steps: and (3) performing ground flow test after the installation is completed, pumping fluid containing tracer into a ground pipeline, and testing whether the collecting assembly normally collects and analyzing whether the output result of the assembly is accurate.
The real-time detection and analysis device for the tracer is arranged at the ground pipeline, so that the produced fluid can be sampled at high frequency, and the concentration of the tracer can be analyzed in real time and the result can be output.
The application has the following advantages and beneficial effects:
1. the long-acting tracer propping agent adopted by the application is excited by the laser generator, can generate light with different wavelengths, realizes the identification and detection of different types of tracer agents, has a core-shell structure formed by wrapping fluorescent tracer agents by ceramsite, has slow release characteristic, and can realize the requirement of long-term dynamic monitoring of oil and gas wells.
2. Compared with the conventional tracing monitoring technology, the hydraulic sand blasting perforation combined with the long-acting tracing propping agent technology can realize the monitoring of the fluid output from perforation, fracturing to the whole process of production.
3. The monitoring method can realize single-stage perforation, fracturing and long-acting tracer proppant injection by entering the well once, optimize the construction flow to the maximum extent and save the operation cost.
4. The application adopts the high-speed sand carrying fluid to carry out perforation, avoids using perforating charges, improves the safety of perforation operation and has wide application range.
5. The application carries out high-frequency, real-time acquisition and online analysis by the detection and analysis device and outputs the analysis result of the concentration of the tracer, thereby avoiding the defects of high randomness of manual sampling, low sampling frequency and long waiting time of the analysis result and improving monitoring timeliness.
Drawings
The accompanying drawings, which are included to provide a further understanding of embodiments of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application.
In the drawings:
fig. 1 is a schematic view of the front and back construction of the hydraulic blast of the present application.
Fig. 2 is a schematic view of the installation structure of the detection and analysis device of the present application.
The names of the components in the drawings are as follows:
1-hydraulic sand blaster main body, 2-nozzle, 3-connecting end, 4-ground pipeline, 5-laser generator, 6-detection device, 7-spectrometer, 8-data processing system, 9-long-acting tracer proppant, 10-stratum, 11-fracturing fracture, 12-perforation channel and 13-sand blaster.
Detailed Description
For the purpose of making apparent the objects, technical solutions and advantages of the present application, the present application will be further described in detail with reference to the following examples and the accompanying drawings, wherein the exemplary embodiments of the present application and the descriptions thereof are for illustrating the present application only and are not to be construed as limiting the present application.
Example 1
The embodiment is the implementation of the monitoring method of the application in a certain oil field in southwest region.
As shown in fig. 1 and 2, the method for monitoring perforation, fracturing and production stage long-acting tracking of the oil and gas reservoir in real time comprises the following steps:
(1) Step 1: pre-perforation preparation, comprising:
step 11: installing a tracer detection and analysis device at a ground pipeline;
the collecting and collecting assembly is electrically connected with the analyzing assembly, ground flow test is carried out after the installation is completed, fluid containing tracer is pumped into a ground pipeline, whether the collecting and collecting assembly normally collects or not is tested, and whether a result output by interpretation processing software is accurate or not is tested;
step 12: selecting a transformation horizon according to reservoir comprehensive evaluation data, and determining perforation positions, wherein the reservoir comprehensive evaluation data comprises high-quality reservoir thickness, permeability, porosity and oil saturation;
step 13: calculating the dosage of the tracer according to the test data of the similar oil-gas well, and selecting the tracer injected in each layer section;
collecting similar oil and gas well production test data, such as single well predicted yield, return discharge capacity, the lowest detection limit of the tracer concentration and monitoring period, determining the type and the dosage m of the tracer, and calculating the following formula (1):
（1）
wherein:-a dose modification factor;
-a minimum detection limit for tracer concentration;
q-single well predicted production, m 3 /d；
T-monitoring period, d;
calculating according to a formula (1) to obtain the tracer dosage m of the well, wherein the tracer dosage m is 1000g, the number of the fracturing sections of the well is 10, and the types of the tracer used are selected from GT-1 to GT-10;
step 14: calculating the proportion of quartz sand and long-acting tracer propping agent in sand blasting liquid
The proportion of the quartz sand to the long-acting tracer propping agent influences the perforation efficiency and the seam making scale, and the content gamma of the long-acting tracer propping agent and the content of the quartz sand in each perforation/fracturing sectionsThe calculation formulas of (2) and (3) are as follows:
（2）
（3）
wherein:segment i long-acting tracer proppant content,%；
a-permeability correction coefficient;
k i average permeability in section i, μm 2 ；
k ji -average permeability of the ith segment, jth cluster, μm 2 ；
B-porosity correction coefficient;
-an i-th segment average porosity;
-the i-th segment, j-th cluster average porosity;
s i -i-th stage quartz sand content,%;
the average value of the permeability and the porosity of each section and each cluster is calculated by logging interpretation data, the permeability correction coefficient and the porosity correction coefficient are determined according to the flowback speed, and the content of the long-acting tracer propping agent gamma and the quartz sand of each section are shown in the following table 1:
step 15: and selecting and adapting the sand blaster according to the physical parameters of the layer to be perforated. Physical parameters of the layer to be perforated include lithology and physical properties including porosity, permeability and formation stress. This example, through analysis of the present well, determines the sand blaster used as shown in fig. 2, wherein the diameter of the holes is 4mm, the number of nozzles is 4, the nozzle phase is 90 °, and the heights of the oppositely arranged nozzles are the same.
(2) Step 2: first interval perforation
Perforating the first layer section by adopting a hydraulic sand blaster, wherein sand blasting liquid adopted by the hydraulic sand blaster is a mixture of quartz sand and a long-acting tracer proppant containing GT-1; connecting a pipe column with a connecting end 3 of a hydraulic sand blaster, putting a hydraulic sand blasting perforating pipe column into a shaft, adjusting the hydraulic sand blasting perforating pipe column, enabling a sand blaster nozzle 2 to be aligned with a first section perforation position, pumping sand blasting liquid, wherein the sand blasting liquid comprises quartz sand and a long-acting tracer propping agent, maintaining large-displacement hydraulic injection, the injection speed is 700L/min, stopping pumping after the design sand blasting liquid amount is accumulated, wherein the grain size of the quartz sand is 40 meshes, pulling the lifting pipe column to the next position of the perforating section, and carrying out hydraulic sand blasting perforation again according to the same operation. The quartz sand plays a role in cutting the sleeve wall at a high speed to form a perforation channel, and the long-acting tracer propping agent further enlarges the perforation channel, so that sand blasting liquid is convenient to enter the stratum.
According to the present field, the interval perforating step is completed after 2 times of the first interval perforation. After the perforation of the layer section is completed, the sleeve gate is closed, micro-injection test extrusion is carried out on the perforation layer position of the layer section, and if continuous injection is carried out, the sleeve is shot.
(3) Step 3: fracturing the first layer after perforation
The first stage of fracturing is carried out by the pressing fracture design, and the fracturing fluid containing the GT-1 long-acting tracer propping agent is pumped to play roles in breaking the stratum, supporting the fracturing fracture and calibrating the produced fluid. After fracturing, adopting clear water to test the pressure of the shaft, stabilizing the pressure for 10min, and taking the pressure drop of not more than 0.5MPa as qualified pressure test.
(4) Step 4: and (3) repeating the steps of perforation and fracturing to finish perforation and fracturing of 2-10 layers, and injecting long-acting tracer proppants which are the long-acting tracer proppants containing GT-2-10 respectively, so as to realize unique calibration of produced gas of each layer.
And (3) sampling through a collecting and collecting assembly arranged at a ground pipeline during perforation, fracturing and open flow and production, wherein the sampling frequency is 1 time/min, and real-time processing is carried out on data through an interpretation module in the collecting and collecting assembly, so that the data are converted into the relationship of the concentration of the tracer agent along with time, and the output contribution of each section is obtained.
Example 2
As shown in fig. 2, the present embodiment discloses a detection and analysis device for use in the monitoring method of the present application. The detection and analysis device comprises a collection and collection assembly and an analysis assembly, the collection and collection assembly is connected with the analysis assembly through an optical fiber, the collection and collection assembly comprises a laser generator 5 and a detection device 6, the analysis assembly comprises a spectrometer 7 and a data processing system 8, a long-acting tracer propping agent 9 returns to a ground pipeline 4 along with produced fluid, the long-acting tracer propping agent 9 is detected by the detection device 6 and is excited by light emitted by the laser generator 5 to emit fluorescence with specific wavelength, the long-acting tracer propping agents 9 with different types are excited by the light to generate light with different wavelengths, and the light is processed by an interpretation module in a spectrum analysis and data processing system 8 of the spectrum analyzer 7 to identify and detect the change condition of the concentration of each section of tracer along with time, so that the condition of produced gas of each section is obtained.
After the sand blasting liquid is ejected at high speed through the nozzle, quartz sand cuts and grinds the sleeve wall to form a perforation channel 12, the long-acting tracer propping agent further enlarges the perforation channel 12, breaks the stratum 10, and extends and supports the fracturing fracture 11 to form a stable seepage channel.
The monitoring method is continuously monitored for 160 days at present, and in normal sampling monitoring, the gas production contribution of each section of the whole well is successfully obtained, so that a favorable data support is provided for optimizing a follow-up development scheme of the oil field.
The foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the application, and is not meant to limit the scope of the application, but to limit the application to the particular embodiments, and any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the application are intended to be included within the scope of the application.
Claims (2)
1. The method for monitoring perforation, fracturing and production stage long-acting tracking of the oil and gas reservoir in real time is characterized by comprising the following steps of:
step 1: pre-perforation preparation, comprising:
step 11: installing a tracer detection and analysis device at a ground pipeline;
step 12: selecting a transformation horizon according to reservoir comprehensive evaluation data, and determining perforation positions, wherein the reservoir comprehensive evaluation data comprises high-quality reservoir thickness, permeability, porosity, gas or oil saturation, and selecting a horizon with large reservoir thickness, good pore permeability and high gas saturation for perforation and fracturing;
step 13: according to the test data of similar oil and gas wells, calculating the using amount of the tracer, selecting the tracer injected in each layer section, and calculating the using amount of the tracer comprises the following specific methods:
collecting similar oil and gas well production test data, including single well predicted output, return discharge capacity, the lowest detection limit of the tracer concentration and monitoring period, determining the type and the dosage m of the tracer, wherein the calculation formula (1) of the dosage m of the tracer is as follows:
（1）
wherein:-a dose modification factor;
-a minimum detection limit for tracer concentration;
Qsingle well predicted production, unit: m is m 3 /d；
TMonitoring period, unit: d, a step of;
step 14: the method for calculating the proportion of the quartz sand and the long-acting tracer propping agent in the sand blasting liquid comprises the following steps of:
the ratio of the quartz sand to the long-acting tracer propping agent influences the perforation efficiency and the seam making scale, and the calculation formulas of the content gamma of the long-acting tracer propping agent and the content s of the quartz sand in each perforation/fracturing section are shown as (2) and (3):
（2）
（3）
wherein:-i th segment long-acting tracer proppant content,%;
a-permeability correction coefficient;
k i average permeability in section i, μm 2 ；
k ji -average permeability of the ith segment, jth cluster, μm 2 ；
B-porosity correction coefficient;
-an i-th segment average porosity;
-the i-th segment, j-th cluster average porosity;
s i -i-th stage quartz sand content,%;
step 15: selecting an adaptive sand blaster according to physical parameters of the layer to be perforated;
step 2: the perforation of the first interval of the layer,
perforating the first layer section by adopting a hydraulic sand blaster, wherein sand blasting liquid adopted by the hydraulic sand blaster comprises a mixture of quartz sand and a long-acting tracer propping agent, the long-acting tracer propping agent is inert and does not react with the quartz sand, and the long-acting tracer propping agent is a core-shell structure formed by wrapping fluorescent tracer with ceramsite;
the specific steps of perforation are as follows: a hydraulic sand blasting perforating pipe column is put into a shaft, the pipe column is adjusted to enable a sand blaster nozzle to be aligned to the perforating position of the layer section, and sand blasting liquid is pumped into the hole to carry out perforation;
the same layer section comprises multiple times of perforation, after one time of perforation is completed, the lifting pipe column is dragged to the next position of the perforation section, and hydraulic sand blasting perforation is performed again according to the same operation until all perforation of the same layer section is completed;
after perforation is finished, perforation inspection is further carried out, wherein the perforation inspection comprises the step of closing a sleeve gate, and micro-injection test extrusion is carried out on the section of perforation layer, if continuous injection is carried out, the sleeve is shot;
step 3: the first interval is fractured after perforation is completed,
after perforation is completed, a tubular column is not required to be lifted to a wellhead, the tubular column maintains the original perforation position, and fracturing treatment is carried out by adopting fracturing fluid containing a long-acting tracer propping agent;
step 4: after the first interval is fractured, lifting the pipe column to the second interval, repeating the steps of perforation and fracturing, completing perforation and fracturing of different intervals, realizing unique calibration of oil or gas produced by each interval, adopting sand blasting liquid matched with the interval during perforation, and adopting a long-acting tracer propping agent matched with the interval during fracturing;
collecting stratum fluid injected with a long-acting tracer propping agent in a perforation stage, a fracturing stage and a subsequent production stage, and detecting and analyzing the collected stratum fluid on line in real time;
the long-acting tracer propping agents in the steps 2, 3 and 4 can emit fluorescence with different specific wavelengths after being excited by a laser generator, so that identification and detection of different types of tracer agents are realized.
2. The method for monitoring the perforation, fracturing and production stages of the oil and gas reservoir in real time through the long-acting tracking of the oil and gas reservoir according to claim 1, wherein the detection and analysis device comprises a collection and production assembly and an analysis assembly, the collection and production assembly is electrically connected with the analysis assembly, the collection and production assembly collects formation fluids containing long-acting tracking proppants and flowing back in the perforation stage, the fracturing stage and the production stage in real time at a wellhead, and the analysis assembly detects and analyzes the formation fluids in real time, so that productivity conditions of each stage are obtained.
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Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
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