CN116608929B - Optical fiber monitoring and calibrating experiment device and method based on mine field experiment - Google Patents
Optical fiber monitoring and calibrating experiment device and method based on mine field experiment Download PDFInfo
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- CN116608929B CN116608929B CN202310897031.0A CN202310897031A CN116608929B CN 116608929 B CN116608929 B CN 116608929B CN 202310897031 A CN202310897031 A CN 202310897031A CN 116608929 B CN116608929 B CN 116608929B
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 98
- 238000002474 experimental method Methods 0.000 title claims abstract description 88
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- 239000011435 rock Substances 0.000 claims abstract description 94
- 238000012806 monitoring device Methods 0.000 claims abstract description 57
- 238000005086 pumping Methods 0.000 claims abstract description 32
- 239000012530 fluid Substances 0.000 claims abstract description 24
- 238000012545 processing Methods 0.000 claims abstract description 22
- 238000004891 communication Methods 0.000 claims abstract description 4
- 239000007788 liquid Substances 0.000 claims description 42
- 239000004568 cement Substances 0.000 claims description 16
- 238000004806 packaging method and process Methods 0.000 claims description 16
- 238000007789 sealing Methods 0.000 claims description 16
- 238000003860 storage Methods 0.000 claims description 16
- 230000008569 process Effects 0.000 claims description 6
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F25/00—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume
- G01F25/10—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of flowmeters
-
- 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
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
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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
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
- E21B49/08—Obtaining fluid samples or testing fluids, in boreholes or wells
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
Abstract
The invention discloses an optical fiber monitoring and calibrating experiment device and method based on a mine field experiment, wherein the experiment device comprises: a pumping system; the inlet end of the experimental sleeve is communicated with the pumping system, the outlet end of the experimental sleeve is plugged, and a series of simulated perforations are formed in the wall of the experimental sleeve; the experimental rock sample, each simulated perforation of the experimental sleeve is communicated to the inside of the experimental rock sample through a high-pressure pipeline, and a flow monitoring device is respectively arranged on the high-pressure pipeline connected with each simulated perforation; the optical fiber to be calibrated is tightly attached to the outer wall surface of the experimental sleeve; and the main control processing system is respectively in communication connection with the flow monitoring device and the optical fiber to be calibrated. The pumping system pumps fracturing fluid into the experimental sleeve, the main control processing system acquires and records monitoring results of the optical fiber to be calibrated and the flow monitoring device, and compares and analyzes the optical fiber monitoring interpretation results of the optical fiber to be calibrated with monitoring data of the flow monitoring device to calibrate the optical fiber interpretation model.
Description
Technical Field
The invention relates to the technical field of oil and gas field development, in particular to an optical fiber monitoring and calibrating experiment device and method based on a mine field experiment.
Background
In order to perform safe and efficient exploration and development on unconventional oil and gas resources, real-time monitoring with quick response and high precision becomes an indispensable part in the development process of oil and gas fields. The distributed optical fiber sensing technology integrates the functions of sensing, transmitting and knowing, and has the characteristics of distribution, long distance, corrosion resistance, interference resistance and the like, so that the optical fiber monitoring which is efficiently, accurately and real-time monitored through the change of physical quantities such as vibration, temperature or strain and the like is widely applied to the field of petroleum engineering.
For geology and geotechnical engineering, optical fiber monitoring is an ideal monitoring technical means, and particularly in the field of oil and gas field development and application, real-time accurate monitoring of the surrounding environment of a shaft and the state of fluid in the shaft is required, but the accuracy of an optical fiber monitoring interpretation model is required to be further demonstrated, and the accuracy of the interpretation model has direct influence on the monitoring result. Therefore, in order to calibrate the optical fiber interpretation model further, accurate calibration of the optical fiber monitoring physical model is required, so that the data obtained by optical fiber monitoring is more accurate and reliable. In the existing optical fiber monitoring and calibrating method, a manual and equipment combination mode is mostly adopted for calibrating, and calibration errors can be caused by manual or equipment influence in the calibrating process, so that monitoring results are misaligned.
In view of this, the present invention has been made.
Disclosure of Invention
In order to solve the problems, the invention provides an optical fiber monitoring calibration experimental device and an optical fiber monitoring calibration experimental method based on a mine field experiment, which are designed to be closer to the actual situation on the premise of meeting the basic theory.
Specifically, the following technical scheme is adopted:
an optical fiber monitoring calibration experiment device based on a mine field experiment, comprising:
a pumping system;
the inlet end of the experimental sleeve is communicated with the pumping system, the outlet end of the experimental sleeve is plugged, and a series of simulated perforations are formed in the wall of the experimental sleeve;
the experimental rock sample, each simulated perforation of the experimental sleeve is communicated to the inside of the experimental rock sample through a high-pressure pipeline, and a flow monitoring device is respectively arranged on the high-pressure pipeline connected with each simulated perforation;
the optical fiber to be calibrated is tightly attached to the outer wall surface of the experimental sleeve;
the main control processing system is respectively in communication connection with the flow monitoring device and the optical fiber to be calibrated;
and the pumping system pumps fracturing fluid into the experimental sleeve, the main control processing system acquires and records monitoring results of the optical fiber to be calibrated and the flow monitoring device, and performs comparison analysis on the optical fiber monitoring interpretation results of the optical fiber to be calibrated and the monitoring data results of the flow monitoring device to calibrate the optical fiber interpretation model.
As an optional implementation manner of the invention, the high-pressure pipeline comprises a main high-pressure pipeline and a plurality of branch high-pressure pipelines communicated with the main high-pressure pipeline, each of the simulated perforation is correspondingly connected with each branch high-pressure pipeline, each branch high-pressure pipeline is respectively provided with a flow monitoring device, and each branch high-pressure pipeline is provided with a control valve between the flow monitoring device and the simulated perforation; the main high-pressure pipeline is communicated to the inside of the experimental rock sample.
As an alternative embodiment of the invention, the experimental rock sample comprises a rock sample main body and a rock sample sealing box, wherein the rock sample main body is sealed inside the rock sample sealing box, the rock sample sealing box is provided with a rock sample liquid inlet end and a rock sample liquid outlet end, and the main high-pressure pipeline is connected with the rock sample liquid inlet end.
As an alternative embodiment of the invention, the pumping system comprises a fracturing pump truck and a liquid storage tank, wherein the fracturing pump truck is communicated with the liquid storage tank, the fracturing pump truck is connected with the experimental sleeve through a high-pressure connecting pipeline, and a rock sample liquid outlet end on the rock sample packaging box is communicated with the liquid storage tank.
As an optional implementation mode of the invention, the optical fiber monitoring and calibrating experiment device based on the mine field experiment comprises a sleeve bracket, wherein the experiment sleeve is fixedly arranged on the sleeve bracket, a shockproof sand box is arranged below a high-pressure connecting pipeline, and the high-pressure connecting pipeline and the experiment sleeve are positioned on the same horizontal line.
As an optional implementation mode of the invention, a fixing ring is arranged at a position avoiding the simulated perforation on the outer wall of the experimental sleeve, and the fixing ring covers and wraps the optical fiber to be calibrated.
As an alternative implementation mode of the invention, the fixed ring is formed by annular pouring of cement at a position avoiding the simulated perforation on the outer wall of the experimental sleeve, and the cement fixed ring is covered and attached on the surface of the optical fiber to be calibrated.
As an alternative embodiment of the invention, the experimental sleeve is formed by sealing and splicing multiple sections of sub-sleeves, the experimental sleeve can be used for selecting the corresponding sealing and splicing multiple sections of sub-sleeves according to experimental requirements, and the splicing length of the experimental sleeve is 10-200m.
The invention also provides an experimental method of the optical fiber monitoring and calibrating experimental device based on the mine field experiment, which comprises the following steps:
the main control processing system controls the pumping system to pump fracturing fluid into the experimental sleeve, and the fracturing fluid enters the experimental rock sample through the simulated perforation of the experimental sleeve;
the main control processing system acquires and records monitoring results of the optical fiber to be calibrated and the flow monitoring device in the fracturing fluid pumping process, compares and analyzes the optical fiber monitoring interpretation results of the optical fiber to be calibrated with the monitoring data results of the flow monitoring device, and calibrates the optical fiber interpretation model.
As an optional implementation mode of the invention, the experimental method of the optical fiber monitoring and calibrating experimental device based on the mine field experiment comprises the following steps:
step S1, arranging an experimental field, preparing a rock sample main body according to rock sample parameters, packaging the rock sample main body in a rock sample packaging box, preparing an experimental sleeve according to perforation parameters, and arranging a series of simulated perforations on the wall of the experimental sleeve;
s2, mounting an experimental sleeve on a sleeve bracket and fixing the experimental sleeve by using a high-strength bolt;
s3, checking the splicing tightness of the experimental sleeve, and tightly attaching the optical fiber to be calibrated on the outer wall surface of the experimental sleeve;
s4, respectively and hermetically connecting each simulated perforation of the experimental sleeve with a branch high-pressure pipeline, wherein an outlet of the simulated perforation is connected with an inlet of a control valve, an outlet of the control valve is connected with an inlet of a flow monitoring device, an outlet of the flow monitoring device is connected with a rock sample liquid inlet end of a rock sample packaging box, a rock sample liquid outlet end is connected with an inlet of a liquid storage tank, and an inlet of the experimental sleeve is hermetically connected with an outlet of a fracturing pump truck through a high-pressure connecting pipeline;
s5, annular pouring is carried out on the outer part of the experimental sleeve by using cement, so that a cement fixing ring which is covered and attached on the surface of the optical fiber to be calibrated is formed;
s6, performing high-strength airtight plugging treatment on the tail end of the experimental sleeve;
step S7, the optical fiber to be calibrated and the flow monitoring device are connected into a main control processing system, and parameter debugging before experiments is carried out;
s8, controlling low-pressure trial pumping of a pumping system, checking the tightness of each joint, checking the perfect sealing, opening a fracturing pump truck, and pumping according to experimental parameters;
and S9, the main control processing system acquires and records parameter monitoring results of the optical fiber to be calibrated and the flow monitoring device, and the parameter comparison of the monitoring results is carried out to complete the optical fiber calibration experiment.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides an optical fiber monitoring and calibrating experiment device and method based on a mine field experiment, which are used for simulating a horizontal shaft in actual reservoir development by preparing an experiment sleeve; the optical fiber to be calibrated is tightly attached to the outer wall surface of the experimental sleeve, so that the flow distribution condition of the experimental sleeve is monitored by the optical fiber to be calibrated; meanwhile, the flow monitoring device is utilized to monitor the flow of the fracturing fluid flowing out of the simulated perforation in real time, the flow of the fracturing fluid monitored in real time through the flow monitoring device is compared with the flow distribution condition monitored through the optical fiber to be calibrated, whether the deviation between the optical fiber monitoring result of the same simulated perforation and the flow monitoring result is within the error allowable range is judged, if the deviation is in the error allowable range, the optical fiber monitoring result at the simulated perforation is accurate, the simulated perforation occupation ratio of the optical fiber monitoring result is summarized, and therefore the accuracy of the optical fiber monitoring to be calibrated is judged, and the calibration of the optical fiber monitoring is completed.
The invention provides an optical fiber monitoring and calibrating experiment device and method based on a mine field experiment, and provides a brand new thought and method for the optical fiber monitoring and calibrating experiment.
Drawings
FIG. 1 is a schematic diagram of a system of an optical fiber monitoring and calibrating experiment device based on a mine field experiment in an embodiment of the invention;
FIG. 2 is a process flow diagram of an optical fiber monitoring calibration experiment method based on a mine field experiment in an embodiment of the invention.
The reference numerals in the drawings indicate: the system comprises a 1-fracturing pump truck 2-shockproof sand box 3-an experimental sleeve 4-a control valve 5-a flow monitoring device 6-a simulated perforation 7-an optical fiber 8 to be calibrated-a liquid storage tank 9-a sleeve bracket 10-a main high-pressure pipeline 11-a fixed ring 12-a high-strength plug 13-a rock sample packaging box 14-a rock sample main body 15-a high-pressure pipeline 16-a high-pressure connecting pipeline 17-a rock sample liquid inlet end 18-a rock sample liquid outlet end 19-a main control processing system.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. It will be apparent that the described embodiments are some, but not all, embodiments of the invention.
Thus, the following detailed description of the embodiments of the invention is not intended to limit the scope of the invention, as claimed, but is merely representative of some embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that, under the condition of no conflict, the embodiments of the present invention and the features and technical solutions in the embodiments may be combined with each other.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the present invention, it should be noted that, the terms "upper", "lower", and the like indicate an azimuth or a positional relationship based on the azimuth or the positional relationship shown in the drawings, or an azimuth or a positional relationship conventionally put in use of the inventive product, or an azimuth or a positional relationship conventionally understood by those skilled in the art, such terms are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or element to be referred must have a specific azimuth, be constructed and operated in a specific azimuth, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.
Referring to fig. 1, an optical fiber monitoring calibration experiment device based on a mine field experiment in this embodiment includes:
a pumping system;
the experimental sleeve 3, wherein the inlet end of the experimental sleeve 3 is communicated with the pumping system, the outlet end of the experimental sleeve 3 is plugged, and a series of simulated perforations 6 are formed in the wall of the experimental sleeve 3;
the experimental rock sample, each simulated perforation 6 of the experimental sleeve 3 is respectively communicated to the inside of the experimental rock sample through a high-pressure pipeline, and a flow monitoring device 5 is respectively arranged on the high-pressure pipeline connected with each simulated perforation 6;
the optical fiber 7 to be calibrated is tightly attached to the outer wall surface of the experimental sleeve 3;
the main control processing system 19 is respectively in communication connection with the flow monitoring device 5 and the optical fiber 7 to be calibrated;
the pumping system pumps fracturing fluid into the experimental sleeve 3, the main control processing system 19 acquires and records monitoring results of the optical fiber 7 to be calibrated and the flow monitoring device 5, the optical fiber monitoring interpretation result of the optical fiber 7 to be calibrated and the monitoring data result of the flow monitoring device 5 are compared and analyzed, and the optical fiber interpretation model is calibrated.
The embodiment provides an optical fiber monitoring and calibrating experiment device based on a mine field experiment, which is used for simulating a horizontal shaft in actual reservoir development by preparing an experiment sleeve 3; the optical fiber 7 to be calibrated is tightly attached to the outer wall surface of the experimental sleeve 3, and the optical fiber 7 to be calibrated realizes the flow distribution condition monitoring of the experimental sleeve 3; meanwhile, the flow monitoring device 5 is utilized to monitor the flow of fracturing fluid flowing out of the simulated perforation 6 in real time, the fracturing fluid flow monitored in real time by the flow monitoring device 5 is compared with the flow distribution monitored by the optical fiber 7 to be calibrated, whether the deviation between the optical fiber monitoring result of the same simulated perforation 6 and the flow monitoring result is within the error allowable range is judged, if the judgment result is yes, the optical fiber monitoring result at the simulated perforation 6 is accurate, the accuracy of optical fiber monitoring by the optical fiber 7 to be calibrated is judged by summarizing the simulated perforation duty ratio of the optical fiber monitoring result, and the calibration of the optical fiber monitoring is completed.
The optical fiber monitoring and calibrating experiment device based on the mine field experiment provides a brand new thought and method for the optical fiber monitoring and calibrating experiment.
The embodiment of the optical fiber monitoring and calibrating experimental device based on the mine field experiment supports simulation experiments of the mine field level, the pumping system, the experimental sleeve 3 and experimental rock samples can simulate equipment of the mine field level, the pumping system can select a fracturing pump truck 1, the experimental sleeve 3 can prepare hundreds of meters, and the experimental rock sample size can reach 1 meter or several meters, so that the optical fiber monitoring and calibrating experimental device based on the mine field experiment is larger in physical simulation experiment scale and closer to the field real reservoir scale, and the obtained calibration experimental data is more accurate and reliable.
As an alternative implementation manner of this embodiment, the high-pressure pipeline in this embodiment includes a main high-pressure pipeline 10 and a plurality of branch high-pressure pipelines 15 that are communicated with the main high-pressure pipeline 10, each of the simulated perforation 6 is correspondingly connected to each branch high-pressure pipeline 15, each branch high-pressure pipeline 15 is provided with a flow monitoring device 5, and each branch high-pressure pipeline 15 is provided with a control valve 4 between the flow monitoring device 5 and the simulated perforation 6; the main high-pressure pipeline 10 is communicated with the inside of the experimental rock sample.
The branch high-pressure pipeline 15 and the simulated perforation 6, the branch high-pressure pipeline 15 and the control valve 4, the branch high-pressure pipeline 15 and the flow monitoring device 5, and the main high-pressure pipeline 10 and the experimental rock sample are all in sealing connection.
In this embodiment, each simulated perforation 6 is connected with a flow monitoring device 5, so as to measure the liquid flow of the simulated perforation 6 more accurately and calibrate the optical fiber 7 to be calibrated more accurately.
In addition, the flow monitoring device 5 of the embodiment can realize flow monitoring corresponding to the simulated perforation 6, and can realize flow on-off of the simulated perforation 6 through the control valve 4, so that flow distribution of the simulated sleeve 3 is changed to calibrate accuracy of optical fiber monitoring, therefore, the optical fiber monitoring calibration experiment device based on the mine field experiment can realize optical fiber monitoring calibration under various flow distribution of the experimental sleeve 3 through on-off control of the control valve 4, repeated experiments are performed, and reliability of the optical fiber monitoring calibration experiment is ensured.
In addition, in order to facilitate the connection of the lines, the high-pressure hoses are used for the main high-pressure line 10 and the branch high-pressure line 15 in this embodiment.
As an alternative implementation of this embodiment, the experimental rock sample includes a rock sample main body 14 and a rock sample packing box 13, the rock sample main body 14 is packed inside the rock sample packing box 13, the rock sample packing box 13 has a rock sample liquid inlet end 17 and a rock sample liquid outlet end 18, and the main high-pressure pipeline 10 is connected with the rock sample liquid inlet end 17.
The experimental rock sample of the embodiment is used for the resistance environment when the fracturing fluid actually flows. Preferably, the rock sample body 14 is an artificially prepared artificial rock sample of dimensions 1m x 0.5m. Specifically, the experimental rock sample preparation process of this example is as follows:
firstly, arranging an experimental site, wherein according to experimental requirements, the rock sample pouring die is a cube die with the length of 1m, the height of 0.5m and the width of 1 m.
After the casting of the rock sample main body 14 is finished, resin glue is uniformly smeared on the surface of the rock sample main body 14 to paste steel plates with the thickness of 5mm, the joints of the steel plates at the side edges are welded with high strength to form a rock sample packaging box 13, and the resin glue is uniformly smeared at the joint after the welding is finished so as to ensure that the packaging box formed by welding has certain stability and sealing performance.
And hoisting the packaged experimental rock sample to a calibration experimental area.
Further, the pumping system according to this embodiment includes a fracturing pump truck 1 and a liquid storage tank 8, the fracturing pump truck 1 is communicated with the liquid storage tank 8, the fracturing pump truck 1 is connected with the experimental sleeve 3 through a high-pressure connecting pipeline 16, and a rock sample liquid outlet end 18 on the rock sample packing box 13 is communicated with the liquid storage tank 8.
The embodiment selects the fracturing pump truck 1 for the mine site construction site, is more fit with the actual condition, and has more accurate monitoring results. The rock sample liquid outlet end 18 of the embodiment and the liquid storage tank 8 realize recycling of fracturing liquid.
The optical fiber monitoring and calibrating experiment device based on the mine field experiment comprises a sleeve support 9, wherein an experiment sleeve 3 is fixedly installed on the sleeve support 9, a shockproof sand box 2 is installed below a high-pressure connecting pipeline 16, and the high-pressure connecting pipeline 16 and the experiment sleeve 3 are located on the same horizontal line.
The sleeve bracket 9 of the implementation is fixed on the ground, the experimental sleeve 3 is fixedly installed on the sleeve bracket 9, and the fixed installation of the experimental sleeve 3 is realized. The central axes of the experimental sleeve 3 and the sleeve support 9 are collinear, and are on the same horizontal line, so that calibration misalignment caused by flow fluctuation due to fluid track change is avoided.
As an alternative implementation manner of the embodiment, in the embodiment, a fixing ring 11 is installed at a position, which is away from the simulated perforation 6, on the outer wall of the experimental sleeve 3, and the fixing ring 11 covers and wraps the optical fiber 7 to be calibrated. In the embodiment, the optical fiber 7 to be calibrated is tightly attached and fixed on the outer wall of the experimental sleeve 3 through the fixing ring 11.
Optionally, the fixing ring 11 in this embodiment is a cement fixing ring formed by annularly pouring cement at a position on the outer wall of the experimental sleeve, where the position is away from the simulated perforation 6, and the position is covered and attached on the surface of the optical fiber 7 to be calibrated. In the embodiment, the high-pressure pipeline is connected with the outlet of the simulated perforation 6 before annular pouring, so that cement is prevented from covering the position of the simulated perforation 6, and the subsequent steps are prevented from being influenced.
In addition, the optical fiber 7 to be calibrated, which is clung to the outer wall surface of the experimental sleeve 3, is secondarily fastened by utilizing the steel ring, so that the optical fiber 7 to be calibrated is prevented from being misplaced due to vibration.
In order to better close to the practical situation, the experimental sleeve 3 of the embodiment can be designed to be hundred meters, so that the experimental sleeve 3 of the embodiment is formed by sealing and splicing multiple sections of sub-sleeves, the experimental sleeve 3 can be used for selecting corresponding sealing and splicing multiple sections of sub-sleeves according to experimental requirements, and the splicing length of the experimental sleeve 3 is 10-200m.
Preferably, according to the fracturing construction scheme, simulated perforation 6 is constructed on the casing wall surface of the experimental casing 3, and each section of sub-casing in the embodiment adopts a spiral uniform distribution mode for perforation.
The tail end of the experimental sleeve 3 is sealed and plugged through a high-strength plug 12.
Preferably, the main control processing system includes a computer terminal, and the flow monitoring device 5 in this embodiment selects an electromagnetic flowmeter.
Referring to fig. 2, the embodiment also provides an experimental method of the optical fiber monitoring calibration experimental device based on the mine field experiment, which comprises the following steps:
the main control treatment system 19 controls the pumping system to pump fracturing fluid into the experimental casing 3, and the fracturing fluid enters the experimental rock sample through the simulated perforation 6 of the experimental casing 3;
the main control processing system 19 acquires and records monitoring results of the optical fiber 7 to be calibrated and the flow monitoring device 5 in the fracturing fluid pumping process, compares and analyzes the optical fiber monitoring interpretation results of the optical fiber 7 to be calibrated with monitoring data results of the flow monitoring device 5, and calibrates an optical fiber interpretation model.
The embodiment provides an optical fiber monitoring and calibrating experiment method based on a mine field experiment, which comprises the steps of preparing an experiment sleeve 3 to simulate a horizontal shaft in actual reservoir development; the optical fiber 7 to be calibrated is tightly attached to the outer wall surface of the experimental sleeve 3, and the optical fiber 7 to be calibrated realizes the flow distribution condition monitoring of the experimental sleeve 3; meanwhile, the flow monitoring device 5 is utilized to monitor the flow of fracturing fluid flowing out of the simulated perforation 6 in real time, the fracturing fluid flow monitored in real time by the flow monitoring device 5 is compared with the flow distribution monitored by the optical fiber 7 to be calibrated, whether the deviation between the optical fiber monitoring result of the same simulated perforation 6 and the flow monitoring result is within the error allowable range is judged, if the judgment result is yes, the optical fiber monitoring result at the simulated perforation 6 is accurate, the accuracy of optical fiber monitoring by the optical fiber 7 to be calibrated is judged by summarizing the simulated perforation duty ratio of the optical fiber monitoring result, and the calibration of the optical fiber monitoring is completed.
The optical fiber monitoring and calibrating experiment method based on the mine field experiment provides a brand new thought and method for the optical fiber monitoring and calibrating experiment.
Specifically, the experimental method of the optical fiber monitoring calibration experimental device based on the mine field experiment in the embodiment comprises the following steps:
step S1, arranging an experimental field, preparing a rock sample main body 14 according to rock sample parameters, packaging the rock sample main body 14 in a rock sample packaging box 13, preparing an experimental sleeve 3 according to perforation parameters, and opening a series of simulated perforations 6 on the wall of the experimental sleeve 3;
step S2, mounting the experimental sleeve 3 on a sleeve bracket 9 and fixing the experimental sleeve by using a high-strength bolt;
s3, checking the splicing tightness of the experimental sleeve 3, and tightly attaching the optical fiber 7 to be calibrated to the outer wall surface of the experimental sleeve 3;
step S4, each simulated perforation 6 of the experimental sleeve 3 is respectively and hermetically connected with a branch high-pressure pipeline 15, wherein the outlet of the simulated perforation 6 is connected with the inlet of a control valve 4, the outlet of the control valve 4 is connected with the inlet of a flow monitoring device 5, the outlet of the flow monitoring device 5 is connected with a rock sample liquid inlet end 17 of a rock sample packing box 13, a rock sample liquid outlet end 18 is connected with the inlet of a liquid storage tank 8, and the inlet of the experimental sleeve 3 is hermetically connected with the outlet of a fracturing pump truck 1 through a high-pressure connecting pipeline 16;
s5, annular pouring is carried out on the outer part of the experimental sleeve 3 by utilizing cement, so that a cement fixing ring which is covered and attached on the surface of the optical fiber 7 to be calibrated is formed;
s6, performing high-strength airtight plugging treatment on the tail end of the experimental sleeve 3;
step S7, the optical fiber 7 to be calibrated and the flow monitoring device 5 are connected into a main control processing system 19, and parameter debugging before experiments is carried out;
step S8, controlling low-pressure trial pumping of a pumping system, checking the tightness of each joint, checking the perfect sealing, opening a fracturing pump truck 1, and pumping according to experimental parameters;
step S9, the main control processing system 19 acquires and records the parameter monitoring results of the optical fiber 7 to be calibrated and the flow monitoring device 5, and the parameter comparison of the monitoring results is carried out to complete the optical fiber calibration experiment.
Example 1
Firstly, arranging an experimental site, wherein according to experimental requirements, the rock sample pouring die is a cube die with the length of 1m, the height of 0.5m and the width of 1 m.
After the casting of the rock sample main body 14 is finished, resin glue is uniformly smeared on the surface of the rock sample main body 14 to be pasted with steel plates with the thickness of 5mm, the joints of the steel plates at the side edges are welded with high strength to form the rock sample sealing box 13, and the resin glue is uniformly smeared at the joints after the welding is finished.
And hoisting the packaged experimental rock sample to a calibration experimental area.
According to the simulated perforation parameters, the hole diameter of the experimental sleeve 3 with the length of 35m is 10mm, the phase angle is 60 degrees, the simulated perforation density is 16 holes/meter, the distribution mode is the perforation processing operation of spiral uniform distribution, the processed experimental sleeve 3 is placed on the sleeve support 9, the flange is used for carrying out airtight splicing on the 3 sections of 35m long sub-sleeves, and after the splicing is finished, each section of sub-sleeve is fastened on the sleeve support 9.
And uniformly coating an adhesive on the surface of the spliced experimental sleeve 3, and additionally arranging a high-strength plug 12 at the tail end of the spliced experimental sleeve, so that the optical fiber 7 to be calibrated is tightly attached to the outer wall surface of the experimental sleeve 3 in a winding mode.
Each simulated perforation 6 is externally connected with a control valve 4 and a flow monitoring device 5 through a branch high-pressure pipeline 15, and the joint of the branch high-pressure pipeline 15 and the simulated perforation 6 is subjected to airtight connection treatment by using resin adhesive, organic silica gel and AB adhesive.
And manufacturing a cement fixed ring pouring die on the outer wall of the spliced experimental sleeve 3, and pouring cement to form a cement fixed ring annular package by the optical fiber 7 to be calibrated and the experimental sleeve 3.
The outlet of the fracturing pump truck 1 is connected with the inlet of the experimental sleeve 3 in a sealing way through the high-pressure connecting pipeline 16, the shockproof sand box 2 is additionally arranged below the high-pressure connecting pipeline 16 between the fracturing pump truck 1 and the experimental sleeve 3, and the high-pressure connecting pipeline 16 and the experimental sleeve 3 are ensured to be on the same horizontal line during the additional arrangement.
Each high-pressure pipeline 15 is communicated with the main high-pressure pipeline 10, the main high-pressure pipeline 10 is utilized to connect the outlets of all the flow monitoring devices 5 connected with the simulated perforation 6 to the rock sample liquid inlet end 17 of the experimental rock sample, and the rock sample liquid outlet end 18 of the experimental rock sample is connected with the liquid storage tank 8, and the liquid storage tank 8 is connected with the fracturing pump truck 1.
The optical fiber 7 to be calibrated is connected with all the flow monitoring devices 5 and the computer terminal through cables.
Example two
On the basis of the first embodiment, the fracturing pump truck 1 is used for fracturing at 6m 3 And injecting fracturing fluid into the experimental sleeve 3 by the displacement per min, detecting the connection tightness of each connection part, and performing zero setting operation on all the flow monitoring devices 5 and the optical fibers 7 to be calibrated by using a computer terminal.
The detection joints are well sealed and are 2m through the fracturing pump truck 1 3 And injecting fracturing fluid into the simulation device by the displacement per min, and observing and recording the indication change of the instrument of the fracturing pump truck 1 during injection.
And adjusting the control valve 4, changing the flow of the liquid passing through the flow monitoring device 5, reading out records at a computer terminal, and comparing the parameters recorded by the flow monitoring device 5 with the parameters recorded by the corresponding conditions of the optical fiber 7 to be calibrated, thereby completing the calibration experiment.
The above embodiments are only for illustrating the present invention and not for limiting the technical solutions described in the present invention, and although the present invention has been described in detail in the present specification with reference to the above embodiments, the present invention is not limited to the above specific embodiments, and thus any modifications or equivalent substitutions are made to the present invention; all technical solutions and modifications thereof that do not depart from the spirit and scope of the invention are intended to be included in the scope of the appended claims.
Claims (5)
1. Optical fiber monitoring calibration experimental device based on mine field experiment, which is characterized by comprising:
a pumping system;
the inlet end of the experimental sleeve is communicated with the pumping system, the outlet end of the experimental sleeve is plugged, and a series of simulated perforations are constructed on the wall of the experimental sleeve;
the experimental rock sample, each simulated perforation of the experimental sleeve is communicated to the inside of the experimental rock sample through a high-pressure pipeline, and a flow monitoring device is respectively arranged on the high-pressure pipeline connected with each simulated perforation;
the optical fiber to be calibrated is tightly attached to the outer wall surface of the experimental sleeve;
the main control processing system is respectively in communication connection with the flow monitoring device and the optical fiber to be calibrated;
the pumping system pumps fracturing fluid into the experimental sleeve, the main control processing system acquires and records monitoring results of the optical fiber to be calibrated and the flow monitoring device, and performs comparison analysis on the optical fiber monitoring interpretation results of the optical fiber to be calibrated and the monitoring data results of the flow monitoring device to calibrate an optical fiber interpretation model;
the high-pressure pipeline comprises a main high-pressure pipeline and a plurality of branch high-pressure pipelines communicated with the main high-pressure pipeline, each simulated perforation is correspondingly connected with each branch high-pressure pipeline, each branch high-pressure pipeline is provided with a flow monitoring device, and each branch high-pressure pipeline is provided with a control valve between the flow monitoring device and the simulated perforation; the main high-pressure pipeline is communicated to the inside of the experimental rock sample;
the experimental rock sample comprises a rock sample main body and a rock sample packaging box, wherein the rock sample main body is packaged in the rock sample packaging box, the rock sample packaging box is provided with a rock sample liquid inlet end and a rock sample liquid outlet end, and the main high-pressure pipeline is connected with the rock sample liquid inlet end;
the pumping system comprises a fracturing pump truck and a liquid storage tank, wherein the fracturing pump truck is communicated with the liquid storage tank, the fracturing pump truck is connected with the experimental sleeve through a high-pressure connecting pipeline, and a rock sample liquid outlet end on the rock sample packaging box is communicated with the liquid storage tank;
the optical fiber monitoring and calibrating experiment device based on the mine field experiment comprises a sleeve bracket, wherein an experiment sleeve is fixedly arranged on the sleeve bracket, a shockproof sand box is arranged below a high-pressure connecting pipeline, and the high-pressure connecting pipeline and the experiment sleeve are positioned on the same horizontal line;
the experimental method of the optical fiber monitoring and calibrating experimental device based on the mine field experiment comprises the following steps:
step S1, arranging an experimental field, preparing a rock sample main body according to rock sample parameters, packaging the rock sample main body in a rock sample packaging box, preparing an experimental sleeve according to perforation parameters, and arranging a series of simulated perforations on the wall of the experimental sleeve;
s2, mounting an experimental sleeve on a sleeve bracket and fixing the experimental sleeve by using a high-strength bolt;
s3, checking the splicing tightness of the experimental sleeve, and tightly attaching the optical fiber to be calibrated on the outer wall surface of the experimental sleeve;
s4, respectively and hermetically connecting each simulated perforation of the experimental sleeve with a branch high-pressure pipeline, wherein an outlet of the simulated perforation is connected with an inlet of a control valve, an outlet of the control valve is connected with an inlet of a flow monitoring device, an outlet of the flow monitoring device is connected with a rock sample liquid inlet end of a rock sample packaging box, a rock sample liquid outlet end is connected with an inlet of a liquid storage tank, and an inlet of the experimental sleeve is hermetically connected with an outlet of a fracturing pump truck through a high-pressure connecting pipeline;
s5, annular pouring is carried out on the outer part of the experimental sleeve by using cement, so that a cement fixing ring which is covered and attached on the surface of the optical fiber to be calibrated is formed;
s6, performing high-strength airtight plugging treatment on the tail end of the experimental sleeve;
step S7, the optical fiber to be calibrated and the flow monitoring device are connected into a main control processing system, and parameter debugging before experiments is carried out;
s8, controlling low-pressure trial pumping of a pumping system, checking the tightness of each joint, checking the perfect sealing, opening a fracturing pump truck, and pumping according to experimental parameters;
and S9, the main control processing system acquires and records parameter monitoring results of the optical fiber to be calibrated and the flow monitoring device, and the parameter comparison of the monitoring results is carried out to complete the optical fiber calibration experiment.
2. The optical fiber monitoring and calibrating experiment device based on the mine field experiment according to claim 1, wherein a fixing ring is arranged at a position on the outer wall of the experiment sleeve, which is away from the simulated perforation, and the fixing ring covers and wraps the optical fiber to be calibrated.
3. The optical fiber monitoring and calibrating experiment device based on the mine field experiment according to claim 2, wherein the fixing ring is formed by annular pouring of cement at a position of avoiding the simulated perforation on the outer wall of the experiment sleeve, and the cement fixing ring is covered and attached on the surface of the optical fiber to be calibrated.
4. The optical fiber monitoring and calibrating experiment device based on the mine field experiment according to claim 1, wherein the experiment sleeve is formed by sealing and splicing a plurality of sections of sub-sleeves, the experiment sleeve can be used for selecting the corresponding sealing and splicing the plurality of sections of sub-sleeves according to experiment requirements, and the splicing length of the experiment sleeve is 10-200m.
5. An experimental method for a mineral field experiment-based optical fiber monitoring calibration experiment apparatus as defined in any one of claims 1 to 4, comprising:
the main control processing system controls the pumping system to pump fracturing fluid into the experimental sleeve, and the fracturing fluid enters the experimental rock sample through the simulated perforation of the experimental sleeve;
the main control processing system acquires and records monitoring results of the optical fiber to be calibrated and the flow monitoring device in the fracturing fluid pumping process, compares and analyzes the optical fiber monitoring interpretation results of the optical fiber to be calibrated with the monitoring data results of the flow monitoring device, and calibrates the optical fiber interpretation model.
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