CN111749668A - For simulating supercritical CO2Wellbore casing for fracturing samples and method of use - Google Patents
For simulating supercritical CO2Wellbore casing for fracturing samples and method of use Download PDFInfo
- Publication number
- CN111749668A CN111749668A CN202010559255.7A CN202010559255A CN111749668A CN 111749668 A CN111749668 A CN 111749668A CN 202010559255 A CN202010559255 A CN 202010559255A CN 111749668 A CN111749668 A CN 111749668A
- Authority
- CN
- China
- Prior art keywords
- sample
- fracturing
- pipe
- annular groove
- liquid injection
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 49
- 238000002347 injection Methods 0.000 claims abstract description 84
- 239000007924 injection Substances 0.000 claims abstract description 84
- 239000007788 liquid Substances 0.000 claims abstract description 74
- 238000007789 sealing Methods 0.000 claims abstract description 53
- 238000012360 testing method Methods 0.000 claims abstract description 31
- 238000005336 cracking Methods 0.000 claims abstract description 10
- 230000001360 synchronised effect Effects 0.000 claims abstract description 8
- 238000005553 drilling Methods 0.000 claims description 35
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 20
- 229910052697 platinum Inorganic materials 0.000 claims description 10
- 230000006835 compression Effects 0.000 claims description 8
- 238000007906 compression Methods 0.000 claims description 8
- 238000004088 simulation Methods 0.000 claims description 8
- 230000000694 effects Effects 0.000 claims description 7
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 239000011435 rock Substances 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 4
- 238000003825 pressing Methods 0.000 claims description 4
- 238000004140 cleaning Methods 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 230000001050 lubricating effect Effects 0.000 claims description 3
- 238000005498 polishing Methods 0.000 claims description 3
- 239000002861 polymer material Substances 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 229940099259 vaseline Drugs 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 24
- 239000003292 glue Substances 0.000 description 12
- 239000012530 fluid Substances 0.000 description 9
- 238000010586 diagram Methods 0.000 description 4
- 238000005520 cutting process Methods 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000000565 sealant Substances 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000002390 adhesive tape Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 229920001568 phenolic resin Polymers 0.000 description 1
- 239000005011 phenolic resin Substances 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920003225 polyurethane elastomer Polymers 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 229920002379 silicone rubber Polymers 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
- E21B43/116—Gun or shaped-charge perforators
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/06—Measuring temperature or pressure
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
- G09B25/00—Models for purposes not provided for in G09B23/00, e.g. full-sized devices for demonstration purposes
- G09B25/04—Models for purposes not provided for in G09B23/00, e.g. full-sized devices for demonstration purposes of buildings
Landscapes
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Fluid Mechanics (AREA)
- Environmental & Geological Engineering (AREA)
- Geochemistry & Mineralogy (AREA)
- Geophysics (AREA)
- Business, Economics & Management (AREA)
- Educational Administration (AREA)
- Educational Technology (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Sampling And Sample Adjustment (AREA)
- Investigating Or Analyzing Materials Using Thermal Means (AREA)
Abstract
The invention relates to a method for simulating supercritical CO2Wellbore casing for fracturing samples and methods of use. The technical scheme is as follows: the central liquid filling device comprises an outer pipe, a central liquid filling pipe, a sealing piece and a miniature temperature sensor, wherein a liquid filling channel is arranged at the center of the outer pipe, one end of the central liquid filling pipe is welded with the inner wall of the outer pipe, and the other end of the central liquid filling pipe is welded with the supercritical CO2The injection ends are connected, and a pipeline between the injection ends is provided with a pressure sensor; the above-mentionedThe outer wall of the outer pipe is provided with an upper side annular groove and a lower side annular groove, liquid injection holes are arranged between the upper side annular groove and the lower side annular groove, and the number, the angle, the position and the cracking form of the liquid injection holes are set according to the test requirements; the liquid injection hole is communicated with the liquid injection channel; the sealing elements are arranged in the upper annular groove and the lower annular groove; the miniature temperature sensor is arranged at the liquid injection hole. The invention can realize single-stage fracturing or single-stage multi-perforation synchronous targeted fracturing at the designated layer position, and can synchronously monitor CO in the fracturing process in real time2Change in phase state of (c).
Description
Technical Field
The invention belongs to the technical field of material cracking tests, and particularly relates to a method for simulating supercritical CO2Wellbore casing for fracturing samples and methods of use.
Background
Horizontal drilling and hydraulic fracturing techniques are the primary methods of exploiting shale gas. The application of hydraulic fracturing technology requires the consumption of a large amount of water resources. Supercritical CO as an alternative to conventional water-based fracturing fluids2Gradually becoming an anhydrous fracturing fluid with great application prospect. When CO is present2The supercritical state is obtained when the temperature and the pressure exceed critical values (31.1 ℃ and 7.38MPa) at the same time. Supercritical CO2The fracturing fluid has unique physicochemical properties such as low viscosity, surface tension close to zero, large diffusion coefficient, super-strong dissolving capacity and the like, and the unique properties enable the fracturing fluid to have a completely open head angle in unconventional reservoir volume fracturing effects. Due to supercritical CO2The fracturing technology is still in the primary stage at home and abroad, so that a great amount of technical challenges are still needed at present in order to be better applied to the field. At present, the supercritical CO is obtained mainly by an indoor physical simulation test method2And (3) the fracturing effect, the fracturing mechanism of the fracturing fluid is researched, and the conclusion obtained by a physical simulation test is used as the theoretical reference of on-site fracturing production.
In supercritical CO2In the physical simulation test of the fracturing sample, pressureThe design and use of fractured wellbore casing is of great significance to test success and failure and engineering guidance. Simulating supercritical CO no matter whether the sample is a large-size rock sample or a small-size natural rock sample, or a cylindrical sample or a cuboid sample2When the fracturing is carried out, the sealing problem between the sample and the fractured shaft casing must be solved, and then the shaft casing is further designed to simulate field application.
At present, the methods for treating the shaft casing and the sample in the indoor physical simulation fracturing test include the following methods: the first type is a straddle packer made of polyurethane rubber placed in a through hole sample, a ring cavity for injecting fracturing fluid is formed by opening a hole in a straddle pressurizing section, and a nut at the bottom of the packer is screwed to strengthen hole sealing. Although the method has high sealing performance, multi-perforation targeted fracturing cannot be realized, the requirement on sample drilling processing is high, and the device structure is complex. The second method is to use various glues to bond the shaft casing with the inner wall of the drilled hole of the sample in the blind hole sample, the used casing is generally a smooth surface or a threaded pipe, and the used glue is mainly epoxy resin glue, chemical glue prepared by mixing, silicon rubber, phenolic resin glue, special high-bonding-strength sealant and the like. Although this method can solve the sealing problem to some extent, there are problems such as limited applicability and strength of the glue; when a small-size open hole section is reserved, high-fluidity glue can be infiltrated to block a central fracturing fluid injection pipe by pouring salt or filling isolation foam into the open hole section; even if a mixing tube is selected for injecting glue or glue is injected for multiple times in a layered mode, bubbles in the glue injection process cannot be avoided; the curing time of the glue is long, and the like, and the problems can directly cause the failure of the test to a great extent, and the operation time and the complexity are increased, or the annular surface of the fracturing fluid is not only a naked eye section, so that the reliability of the test data is reduced. Thirdly, a single-ring groove or double-ring groove pressure head with a long/short liquid injection pipe at the center is used for sealing the joint of the sample and the pressure head by using sealant or heat-shrinkable tubes; or the central drilling hole and the shaft are bonded by the second method, and two sealing grooves are arranged at the inlet of the shaft and are used for sealing the clamping device. The former is suitable for treating the central drilling hole of the whole sample as a fracturing section, but can not meet the test requirements of fixed-point fracturing or single-section multi-perforation fracturing; once the sealing fails, the range of the fracturing section designed by the original test cannot be completely guaranteed. Fourthly, embedding a steel pipe in a central drill hole with a prefabricated special shape, reserving a naked eye section and placing a thermocouple above the naked eye section; or sealing rings are arranged at different depths of the through hole sample, and a temperature sensor is arranged in the holder. The former has higher requirements on the sample; the latter has no detailed description of the details of the shaft, but both can not achieve the test requirement of single-section multi-perforation cracking and the measured temperature is not the bottom temperature. And the fifth method is a shaft casing with a plurality of perforations, the central drilling hole of the sample is bonded with the shaft by the second method, and the method of plugging paper or sticking adhesive tapes and the like in the perforations prevents the glue from blocking the holes, and the method still has the similar problems with the second method.
In order to adapt to samples of different types and sizes, the fracturing section position is designated to realize single-section annular cavity fracturing or single-section multi-perforation synchronous targeted fracturing, and CO is synchronously monitored in real time2The temperature and pressure change in the injection process and the sealing effect between the shaft and the hole wall need to be improved, so that the defects of the five shaft design methods or the sample sealing treatment method need to be improved, and therefore, the supercritical CO is designed2New wellbore casing in fracturing sample physical simulation test can enable supercritical CO2Better cracking test effect and supercritical CO2The on-site application of the fracturing has more guiding significance.
Disclosure of Invention
The invention provides a method for simulating supercritical CO2The shaft casing of the fracturing sample and the use method thereof can realize single-section fracturing or single-section multi-perforation synchronous targeted fracturing at a specified layer position, and can synchronously monitor CO in the fracturing process in real time2Is supercritical CO2The cracking test research provides a simpler, more efficient and reliable test method.
The technical scheme of the invention is as follows:
for simulating supercritical CO2The shaft casing of the fracturing sample comprises an outer pipe, a central liquid injection pipe, a sealing element and a miniature temperature sensor, wherein the center of the outer pipe is provided with a liquid injection pipeOne end of the central liquid injection pipe is welded with the inner wall of the outer pipe, and the other end of the central liquid injection pipe is welded with the supercritical CO2The injection ends are connected, and a pipeline between the injection ends is provided with a pressure sensor; the outer wall of the outer pipe is provided with an upper side annular groove and a lower side annular groove, and the distance between the upper side annular groove and the lower side annular groove is determined according to the test requirement; liquid injection holes are arranged between the upper annular groove and the lower annular groove, and the number, the angle, the position and the cracking form of the liquid injection holes are set according to the test requirements; the liquid injection hole is communicated with the liquid injection channel; the sealing elements are arranged in the upper annular groove and the lower annular groove; the miniature temperature sensor is arranged at the liquid injection hole.
Further, the method is used for simulating supercritical CO2The well casing of the fracturing sample, wherein the material of the outer pipe is high pressure resistant stainless steel; the outer diameter of the outer pipe is matched with the central drilling hole diameter of the sample.
Further, the method is used for simulating supercritical CO2The bottom of the liquid injection channel is 10mm away from the bottom of the outer pipe; the central liquid injection pipe is arranged in the outer pipe, and the central liquid injection pipe and the outer pipe are welded at the end parts to play roles in fixing and sealing; and a buried space of the miniature temperature sensor is reserved between the pipe bottom of the central liquid injection pipe and the bottom of the liquid injection channel.
Further, the method is used for simulating supercritical CO2The method comprises the following steps that a shaft casing of a fracturing sample is formed, wherein the opening positions of an upper side annular groove and a lower side annular groove on the outer wall of an outer pipe are determined according to test requirements; the outer diameters of the upper annular groove and the lower annular groove are the same as the outer diameter of the outer pipe, and the inner diameter of the upper annular groove and the lower annular groove is larger than the outer diameter of the central liquid injection pipe.
Further, the method is used for simulating supercritical CO2The number, the angle, the position and the fracturing form of the liquid injection holes are set according to test requirements, and single-section annular cavity fracturing or single-section multi-perforation synchronous targeted fracturing is realized.
Further, the method is used for simulating supercritical CO2Wellbore casing for fracturing samples, wherein said seal is selected fromAnd selecting a part which is wear-resistant and has better compression deformation rate and rebound rate, and the size of the part is matched with the size of the corresponding groove, so that the performance of the sealing element is fully exerted.
Further, the method is used for simulating supercritical CO2The micro temperature sensor is a micro platinum resistor, two thin leads on the micro platinum resistor are welded with one end of a lead, the lead is placed in the center liquid injection pipe, and the center liquid injection pipe and the lead pass through a supercritical CO (carbon dioxide) by utilizing a front clamping sleeve, a rear clamping sleeve and a pressing cap2The three-way valve of the injection end is led out, and the leading-out end of the lead is sealed and fixed through a high polymer material sealing plug; and signals of the miniature platinum resistor and the pressure sensor are transmitted to a computer through A/D conversion.
The above description is for simulating supercritical CO2A method of using a wellbore casing for a fracturing sample, comprising the steps of:
step 1: preparing a sample and drilling a central borehole along the axial direction of the sample; polishing and chamfering the inner part of the upper end of the central drilling hole of the sample, wherein the chamfering standard is a sealing element which can be directly placed in an annular groove at the lower side of the outer tube;
step 2: cleaning rock debris in the central drilling hole of the sample, and observing whether macro cracks exist on the outer surface of the sample and the periphery of the central drilling hole;
and step 3: coating a thin layer of vaseline on the exposed surface of each sealing element and the inner wall of a central drilling hole of the sample, playing a role in lubricating when the outer pipe is put down, and achieving a sealing effect by the expansion and compression of the sealing elements between the outer pipe and the wall of the central drilling hole;
and 4, step 4: selecting a support sleeve with a proper size to be arranged at the upper end of the outer pipe, wherein the outer diameter of the support sleeve is matched with the central drilling hole diameter of the sample, the inner diameter of the support sleeve is the same as the hole diameter of the liquid injection channel, and the top of the support sleeve is ensured to be flush with the end face of the sample;
and 5: after applying axial pressure and confining pressure to the sample, starting supercritical CO2Stop valve at injection end for supercritical CO injection of fracturing medium2Injecting into the central liquid injection pipe for supercritical fluidCO2Performing a simulation test on a fracturing sample; signals of the micro temperature sensor and the pressure sensor are transmitted to a computer through A/D conversion, and the computer synchronously collects supercritical CO in real time2CO in the fracturing process2Temperature and pressure changes.
The invention has the beneficial effects that:
(1) the shaft casing forming integrated device has the advantages of simple structure, lower cost, convenient test operation and high success rate, and can ensure supercritical CO2And the reliability of the fracturing test data result is ensured, and the shaft casing and the support casing can be recovered for repeated use after all the test data of the sample are acquired.
(2) The invention realizes the supercritical CO by directly placing the micro temperature measuring device near the bottom hole injection hole2CO in the process of cracking2The temperature is accurately measured, and the supercritical CO can be researched by combining the monitoring of the pressure of the liquid injection end2CO in cracking test sample process2The phase state changes.
(3) The horizontal well single-section fracturing or single-section multi-perforation synchronous targeted fracturing device is matched with the supporting casing to flexibly select different positions of the central borehole to carry out single-section annular cavity fracturing or single-section multi-perforation synchronous targeted fracturing, improves the accuracy of fracturing azimuth and sealing effect, and provides reference for the experimental research and field engineering application of the horizontal well single-section fracturing or single-section multi-perforation synchronous targeted fracturing.
Drawings
FIG. 1 is a graph showing the results of example 1 for simulating supercritical CO2A schematic diagram of the use state of the wellbore casing of the fracturing sample;
FIG. 2 is a schematic diagram of the structure of a single-section annular cavity wellbore casing in example 1;
FIG. 3 is a schematic diagram of the structure of a single-stage inline multi-perforated wellbore casing in example 2;
FIG. 4 is a cross-sectional view taken along line A-A of FIG. 3;
FIG. 5 is a schematic diagram of the structure of a single-section spiral multi-perforated wellbore casing in example 3;
FIG. 6 is a cross-sectional view taken along line B-B of FIG. 5;
in the figure: 1-sealing plug of high molecular material; 2, pressing a cap; 3, front cutting sleeve; 4-rear cardSleeving; 5-conducting wire; 6-supporting the sleeve; 7-central liquid injection pipe; 8-supercritical CO2An injection end; 9-an outer tube; 10-miniature platinum resistor; 11-central drilling; 12-upper side annular groove; 13-thin wire; 14-liquid injection hole; 15-ring cavity; 16-lower annular groove; 17-sample; 18-round groove.
Detailed Description
The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention and the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention, and not all embodiments are intended to be illustrative of the invention and are not limiting of the invention. In particular, the technical scheme of the invention is not limited to the fracturing fluid medium, the sample size, the slotting size and the central drilling size related to the invention.
Example 1
As shown in figures 1 and 2, for simulating supercritical CO2The shaft casing of the single-section annular cavity of the fracturing sample comprises an outer pipe 9, a central liquid injection pipe 7, a sealing element and a micro temperature sensor. The outer pipe 9 is made of high-pressure-resistant stainless steel; the outer diameter of the outer tube 9 is matched with the aperture of a central drilling hole 11 of a test sample 17; drilling a channel of the central liquid injection pipe 7 along the central axis direction of the outer pipe 9, wherein the diameter of the channel is 3.2mm, and the distance from the bottom of the channel to the bottom of the outer pipe 9 is 10 mm; the groove depth of the upper annular groove 12 and the lower annular groove 16 is 1.4mm, and the groove width is 2.2 mm. The outer diameters of the upper annular groove 12 and the lower annular groove 16 are the same as the outer diameter of the outer pipe 9, the inner diameter of the upper annular groove 12 and the lower annular groove 16 is larger than the outer diameter of the central liquid injection pipe 7, the upper end face of the upper annular groove 12 is 25mm away from the top of the outer pipe 9, and the lower end face of the lower annular groove 16 is 3mm away from the bottom of the outer pipe 9; the diameter of the outer pipe 9 is reduced between the upper annular groove 12 and the lower annular groove 16 to form an annular cavity 15, and the inner diameter of the annular cavity 15 is ensured to be larger than the outer diameter of the central liquid injection pipe 7. The upper end face and the lower end face of the inner diameter side of the annular cavity 15 are 1mm away from the upper annular groove 12 and the lower annular groove 16, and the upper end face and the lower end face of the outer diameter side of the annular cavity 15 are communicated with sealing pieces in the upper annular groove 12 and the lower annular groove 16. Drilling a liquid injection hole 14 on the outer pipe 9 at the central position of the annular cavity 15 to ensure that the liquid injection hole 14 and the outer pipe are connectedThe liquid injection channels of the 9 are communicated, so that the annular cavity 15 is filled with fracturing liquid. The central liquid injection pipe 7 is arranged in the liquid injection channel of the outer pipe 9, and the central liquid injection pipe and the liquid injection channel are welded at the end parts to play roles in fixing and sealing. And a buried space of the miniature temperature sensor is reserved between the pipe bottom of the central liquid injection pipe 7 and the bottom of the liquid injection channel. The size of the sealing element is matched with the size of the upper annular groove 12 and the lower annular groove 16, and the sealing element is a wear-resistant part with better compression deformation rate and rebound rate. The miniature temperature sensor is a miniature platinum resistor 10, and the miniature platinum resistor 10 is embedded in the liquid injection hole 14; two thin leads 13 on the miniature platinum resistor 10 are welded with one end of a lead 5, the lead 5 is placed in the central liquid injection pipe 7, and the central liquid injection pipe 7 and the lead 5 pass through the supercritical CO by utilizing a front cutting sleeve 3, a rear cutting sleeve 4 and a pressing cap 22The three-way valve of the injection end 8 is led out, and the leading-out end of the lead 5 is sealed and fixed through a high polymer material sealing plug 1.
The use method of the single-section annular cavity wellbore casing comprises the following steps:
step 1: preparing a cylindrical sample 17 with the diameter of 100mm and the height of 200mm, and drilling a central drill hole 11 with the diameter of 10mm and the depth of 110mm along the axial direction of the sample; polishing and chamfering are carried out on the inner part of the upper end of the central drilling hole 11, and the chamfering standard is a sealing element which can be directly placed into an annular groove 16 on the lower side of the outer pipe 9;
step 2: cleaning rock debris in the central drilling hole 11, and observing whether macro cracks exist on the outer surface of the sample 17 and the periphery of the central drilling hole 11;
and step 3: coating a thin layer of vaseline on the exposed surface of each sealing element and the inner wall of the central drilling hole 11 of the sample, lubricating the outer pipe 9 when the outer pipe 9 is put down, and sealing the hole wall of the central drilling hole 11 by the expansion and compression of the sealing elements between the outer pipe 9 and the hole wall of the central drilling hole
And 4, step 4: selecting a support casing 6 with an appropriate size to be placed at the upper end of the outer pipe 9 so as to be adapted to the central drill holes 11 with different sizes of the samples and the specified well casing lowering position; the outer diameter of the support sleeve 6 is matched with the aperture of a central drilling hole 11 of a test sample 17, the inner diameter of the support sleeve is the same as the aperture of the central drilling hole of the outer tube 6, and the top of the support sleeve 6 is ensured to be flush with the end face of the test sample 17;
and 5: after applying axial pressure and confining pressure to the sample 17, the supercritical CO is started2A stop valve at the injection end 8 for supercritical CO injection of the fracturing medium2Injecting into the central liquid injection pipe 7 for supercritical CO2Simulation test of the fracturing sample 17; signals of the micro temperature sensor and the pressure sensor are transmitted to a computer through A/D conversion, and the computer synchronously collects supercritical CO in real time2CO in the fracturing process2Temperature and pressure changes.
Example 2
As shown in fig. 3 and 4, the difference from the embodiment 1 is that the single-section inline multi-perforation wellbore casing: a first circular groove 18 is formed in the side wall of the outer pipe 9 at a position d1 away from the upper end surface of the lower annular groove 16 of the outer pipe 9, and a second circular groove 18 is formed by moving upwards (d1+ h) in the axial direction by taking the position of the first circular groove 18 as a reference; similarly, a third circular groove 18 is formed at a position which moves upwards (d1+2h) along the axial direction, a fourth circular groove 18 is formed at a position which moves upwards (d1+3h) along the axial direction, and a fifth circular groove 18, a sixth circular groove 18, a seventh circular groove 18 and an eighth circular groove 18 are formed in a linear array on the opposite sides of the first circular groove 18, the second circular groove 18, the third circular groove 18 and the fourth circular groove 18. The outer diameter of each circular groove 18 is R1, the inner diameter is R2, and the liquid injection hole 14 with the diameter smaller than R2 is drilled at the center of each circular groove 18. Wherein, (d1-R1) >10mm is the best, and h ═ 2R1+10) mm is the best. Preferably, the sealing elements are wear-resistant and have better compression deformation rate and rebound rate, and the sealing elements are arranged in the circular grooves 18, wherein the size of each sealing element is matched with that of the circular groove 18 at the corresponding position, so that the performance of each sealing element is fully exerted.
Example 3
As shown in fig. 5 and 6, the difference from the example 1 is that the single-section spiral multi-perforated wellbore casing: a first circular groove 18 is formed in the side wall of the outer pipe 9 at a position d1 away from the upper end surface of the lower annular groove 16 of the outer pipe 9, and a second circular groove 18 is formed by moving upwards (d1+ h) along the axial direction and rotating 90 degrees anticlockwise along the radial direction by taking the position of the first circular groove 18 as a reference; similarly, a third circular groove 18 is formed by moving upwards (d1+2h) along the axial direction and rotating 90 degrees anticlockwise along the radial direction, and a fourth circular groove 18 is formed by moving upwards (d1+3h) along the axial direction and rotating 90 degrees anticlockwise along the radial direction. Wherein, the outer diameter of each circular groove 18 is R1, the inner diameter is R2, and the liquid injection hole 14 with the aperture smaller than R2 is drilled at the center of each circular groove 18. Wherein, (d1-R1) >10mm is the best, and h ═ 2R1+10) mm is the best. Preferably, the sealing elements are wear-resistant and have better compression deformation rate and rebound rate, and the sealing elements are arranged in the circular grooves 18, wherein the size of each sealing element is matched with that of the circular groove 18 at the corresponding position, so that the performance of each sealing element is fully exerted.
Finally, the principle and the implementation of the present invention are explained above by applying specific embodiments, and the above description of the embodiments is only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In summary, this summary should not be construed to limit the present invention.
Claims (8)
1. For simulating supercritical CO2Send pit shaft sleeve pipe of splitting sample, its characterized in that, annotate liquid pipe, sealing member and miniature temperature sensor including outer tube, center, the center of outer tube is equipped with annotates the liquid passageway, the center annotate the one end of liquid pipe with the inner wall welding of outer tube, the other end and the supercritical CO of liquid pipe are annotated to the center2The injection ends are connected, and a pipeline between the injection ends is provided with a pressure sensor; the outer wall of the outer pipe is provided with an upper side annular groove and a lower side annular groove, liquid injection holes are arranged between the upper side annular groove and the lower side annular groove, and the number, the angle, the position and the cracking form of the liquid injection holes are set according to the test requirements; the liquid injection hole is communicated with the liquid injection channel; the sealing elements are arranged in the upper annular groove and the lower annular groove; the miniature temperature sensor is arranged at the liquid injection hole.
2. The method for modeling supercritical CO of claim 12Cracking testThe wellbore casing is characterized in that the material of the outer pipe is high-pressure-resistant stainless steel; the outer diameter of the outer pipe is matched with the central drilling hole diameter of the sample.
3. The method for modeling supercritical CO of claim 12The shaft casing of the fracturing sample is characterized in that the bottom of the liquid injection channel is 10mm away from the bottom of the outer pipe; the central liquid injection pipe is arranged in the outer pipe, and the central liquid injection pipe and the outer pipe are welded at the end parts to play roles in fixing and sealing; and a buried space of the miniature temperature sensor is reserved between the pipe bottom of the central liquid injection pipe and the bottom of the liquid injection channel.
4. The method for modeling supercritical CO of claim 12The shaft casing for the fracturing sample is characterized in that the opening positions of the upper annular groove and the lower annular groove on the outer wall of the outer pipe are determined according to test requirements; the outer diameters of the upper annular groove and the lower annular groove are the same as the outer diameter of the outer pipe, and the inner diameter of the upper annular groove and the lower annular groove is larger than the outer diameter of the central liquid injection pipe.
5. The method for modeling supercritical CO of claim 12The shaft casing of the fracturing sample is characterized in that the number, the angle, the position and the fracturing form of the liquid injection holes are set according to test requirements, and single-section annular cavity fracturing or single-section multi-perforation synchronous targeted fracturing is realized.
6. The method for modeling supercritical CO of claim 12The shaft casing of the fracturing sample is characterized in that the sealing element is a wear-resistant part with better compression deformation rate and rebound rate, the size of the sealing element is matched with that of a corresponding groove, and the performance of the sealing element is fully exerted.
7. The method for modeling supercritical CO of claim 12The shaft casing pipe of the fracturing sample is characterized in that the miniature temperature sensor is a miniature platinum resistor, and two thin leads and wires on the miniature platinum resistorThe lead is placed in the central liquid injection pipe, and the central liquid injection pipe and the lead pass through supercritical CO by utilizing a front clamping sleeve, a rear clamping sleeve and a pressing cap2The three-way valve of the injection end is led out, and the leading-out end of the lead is sealed and fixed through a high polymer material sealing plug; and signals of the miniature platinum resistor and the pressure sensor are transmitted to a computer through A/D conversion.
8. Use according to one of claims 1 to 7 for simulating supercritical CO2The use method of the wellbore casing of the fracturing sample is characterized by comprising the following steps:
step 1: preparing a sample and drilling a central borehole along the axial direction of the sample; polishing and chamfering the inner part of the upper end of the central drilling hole of the sample, wherein the chamfering standard is a sealing element which can be directly placed in an annular groove at the lower side of the outer tube;
step 2: cleaning rock debris in the central drilling hole of the sample, and observing whether macro cracks exist on the outer surface of the sample and the periphery of the central drilling hole;
and step 3: coating a thin layer of vaseline on the exposed surface of each sealing element and the inner wall of a central drilling hole of the sample, playing a role in lubricating when the outer pipe is put down, and achieving a sealing effect by the expansion and compression of the sealing elements between the outer pipe and the wall of the central drilling hole;
and 4, step 4: selecting a support sleeve with a proper size to be arranged at the upper end of the outer pipe, wherein the outer diameter of the support sleeve is matched with the central drilling hole diameter of the sample, the inner diameter of the support sleeve is the same as the hole diameter of the liquid injection channel, and the top of the support sleeve is ensured to be flush with the end face of the sample;
and 5: after applying axial pressure and confining pressure to the sample, starting supercritical CO2Stop valve at injection end for supercritical CO injection of fracturing medium2Injecting into the central liquid injection pipe for supercritical CO2Performing a simulation test on a fracturing sample; signals of the micro temperature sensor and the pressure sensor are transmitted to a computer through A/D conversion, and the computer synchronously collects supercritical CO in real time2CO in the fracturing process2Temperature and pressure changes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010559255.7A CN111749668B (en) | 2020-06-18 | 2020-06-18 | For simulating supercritical CO2Wellbore casing for fracturing samples and method of use |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010559255.7A CN111749668B (en) | 2020-06-18 | 2020-06-18 | For simulating supercritical CO2Wellbore casing for fracturing samples and method of use |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111749668A true CN111749668A (en) | 2020-10-09 |
| CN111749668B CN111749668B (en) | 2021-06-29 |
Family
ID=73451145
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010559255.7A Active CN111749668B (en) | 2020-06-18 | 2020-06-18 | For simulating supercritical CO2Wellbore casing for fracturing samples and method of use |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111749668B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112647919A (en) * | 2020-12-30 | 2021-04-13 | 东北大学 | CO based on resistance change2Device and method for monitoring phase change in fracturing hole |
| CN113011071A (en) * | 2021-03-30 | 2021-06-22 | 西南石油大学 | Deformation simulation method and system for natural fracture slippage shearing shale gas horizontal well casing under multistage fracturing |
| CN114018719A (en) * | 2021-11-04 | 2022-02-08 | 中国矿业大学 | Supercritical carbon dioxide fracturing temperature and pressure accurate monitoring test device and method |
| CN115573705A (en) * | 2022-10-11 | 2023-01-06 | 重庆科技学院 | Physical simulation method for deformation of horizontal section casing of deep shale gas well |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0672831A2 (en) * | 1994-03-08 | 1995-09-20 | ISCO, Inc. | Apparatus and method for supercritical fluid extraction |
| CN102778554A (en) * | 2012-08-06 | 2012-11-14 | 重庆大学 | Experimental device for improving permeability of shale gas storage layer in supercritical CO2 fracturing process |
| CN105510142A (en) * | 2016-01-15 | 2016-04-20 | 太原理工大学 | Coal petrography multiphase different fluid three-axis crushing test unit and method |
| CN105672974A (en) * | 2016-02-25 | 2016-06-15 | 重庆大学 | Making method of triaxial-stress supercritical carbon dioxide fracturing shale experimental test specimen |
| CN107246998A (en) * | 2017-07-19 | 2017-10-13 | 中国石油大学(北京) | A kind of supercritical carbon dioxide rock core pressure break clamper under pore pressure saturation |
| CN107478515A (en) * | 2017-07-19 | 2017-12-15 | 中国石油大学(北京) | A kind of supercritical carbon dioxide rock core fracturing experiments method under pore pressure saturation |
| CN107620585A (en) * | 2017-08-15 | 2018-01-23 | 中国石油大学(北京) | The physical simulation experiment device and its method of horizontal well spiral perforation successively pressure break |
| CN110617046A (en) * | 2019-10-17 | 2019-12-27 | 中国石油大学(华东) | Shaft device for horizontal well multistage staged fracturing physical simulation experiment |
| CN111220478A (en) * | 2020-01-20 | 2020-06-02 | 中南大学 | High-temperature high-pressure supercritical carbon dioxide rock core cracking test device |
-
2020
- 2020-06-18 CN CN202010559255.7A patent/CN111749668B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0672831A2 (en) * | 1994-03-08 | 1995-09-20 | ISCO, Inc. | Apparatus and method for supercritical fluid extraction |
| CN102778554A (en) * | 2012-08-06 | 2012-11-14 | 重庆大学 | Experimental device for improving permeability of shale gas storage layer in supercritical CO2 fracturing process |
| CN105510142A (en) * | 2016-01-15 | 2016-04-20 | 太原理工大学 | Coal petrography multiphase different fluid three-axis crushing test unit and method |
| CN105672974A (en) * | 2016-02-25 | 2016-06-15 | 重庆大学 | Making method of triaxial-stress supercritical carbon dioxide fracturing shale experimental test specimen |
| CN107246998A (en) * | 2017-07-19 | 2017-10-13 | 中国石油大学(北京) | A kind of supercritical carbon dioxide rock core pressure break clamper under pore pressure saturation |
| CN107478515A (en) * | 2017-07-19 | 2017-12-15 | 中国石油大学(北京) | A kind of supercritical carbon dioxide rock core fracturing experiments method under pore pressure saturation |
| CN107620585A (en) * | 2017-08-15 | 2018-01-23 | 中国石油大学(北京) | The physical simulation experiment device and its method of horizontal well spiral perforation successively pressure break |
| CN110617046A (en) * | 2019-10-17 | 2019-12-27 | 中国石油大学(华东) | Shaft device for horizontal well multistage staged fracturing physical simulation experiment |
| CN111220478A (en) * | 2020-01-20 | 2020-06-02 | 中南大学 | High-temperature high-pressure supercritical carbon dioxide rock core cracking test device |
Non-Patent Citations (1)
| Title |
|---|
| 解经宇等: "射孔对页岩水力裂缝形态影响的物理模拟实验", 《煤炭学报》 * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112647919A (en) * | 2020-12-30 | 2021-04-13 | 东北大学 | CO based on resistance change2Device and method for monitoring phase change in fracturing hole |
| CN112647919B (en) * | 2020-12-30 | 2022-06-21 | 东北大学 | CO based on resistance change2Device and method for monitoring phase change in fracturing hole |
| CN113011071A (en) * | 2021-03-30 | 2021-06-22 | 西南石油大学 | Deformation simulation method and system for natural fracture slippage shearing shale gas horizontal well casing under multistage fracturing |
| CN114018719A (en) * | 2021-11-04 | 2022-02-08 | 中国矿业大学 | Supercritical carbon dioxide fracturing temperature and pressure accurate monitoring test device and method |
| CN114018719B (en) * | 2021-11-04 | 2024-01-26 | 中国矿业大学 | Supercritical carbon dioxide fracturing temperature and pressure accurate monitoring test device and method |
| CN115573705A (en) * | 2022-10-11 | 2023-01-06 | 重庆科技学院 | Physical simulation method for deformation of horizontal section casing of deep shale gas well |
| CN115573705B (en) * | 2022-10-11 | 2023-06-23 | 重庆科技学院 | Physical simulation method for deformation of horizontal section sleeve of deep shale gas well |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111749668B (en) | 2021-06-29 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111749668B (en) | For simulating supercritical CO2Wellbore casing for fracturing samples and method of use | |
| CN105510142B (en) | A kind of axle crushing test device of coal petrography multiphase different fluid three and test method | |
| CN109025977B (en) | Low-cost long-acting intelligent password water finding and controlling system and method | |
| CN110593837B (en) | Fracturing construction operation method for soluble full-bore sliding sleeve | |
| US7296927B2 (en) | Laboratory apparatus and method for evaluating cement performance for a wellbore | |
| CN112814642B (en) | Shaft device and method for shale horizontal well staged fracturing physical simulation experiment | |
| CN109001438A (en) | A kind of joint seal gas shutoff experimental simulation device and test method | |
| CN107620585B (en) | Physical simulation experiment device and method for horizontal well spiral perforation layer-by-layer fracturing | |
| CN103556993A (en) | Simulation experimental analog method for low permeability oilfield planar five-spot well pattern carbon dioxide flooding | |
| CN105628506A (en) | Rock fracture simulation sample and preparation method thereof, as well as simulation test device and simulation test method | |
| CN113153255B (en) | Shaft device and method for simulating horizontal well crack synchronous propagation experiment | |
| CN102979505A (en) | Well cementation cement sheath performance simulation experiment device and experiment method | |
| CN107656036B (en) | Experimental device and method for evaluating high-temperature high-pressure dynamic sealing and blocking effects | |
| CN107420096B (en) | Physical simulation experiment device and method for horizontal well multistage hydraulic layer-by-layer fracturing | |
| CN112557135A (en) | Preparation and sealing method of rock sample containing cracks for multi-field coupling triaxial test | |
| CN111561281A (en) | Drilling fluid leak protection leaking stoppage effect evaluation experiment system | |
| CN105300803A (en) | HTHP well cementation cement sheath integrity simulation evaluation tester | |
| CN105738277B (en) | Method for detecting bonding strength of channeling sealing agent | |
| CN105178908B (en) | The chemical grouting packing device and method of down-hole formation closure | |
| CN112878986B (en) | Device and method for testing mechanical property and sealing property of cement sheath-formation interface of oil and gas well | |
| CN112096359B (en) | Pitching temporary blocking steering fracturing test device, system and manufacturing method | |
| CN114659906B (en) | In-situ wellbore multi-interface shear test device and method thereof | |
| CN116380679A (en) | Dry-hot rock fracturing experiment machine capable of tracking crack propagation path and experiment method | |
| CN112443288A (en) | Experimental device for evaluating sealing capability of two interfaces of well cementation cement sheath | |
| CN115929272A (en) | Horizontal well staged clustering fracturing experimental device and method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |