CN113445997A - High-pressure sealing simulation device of underground packing system and using method thereof - Google Patents
High-pressure sealing simulation device of underground packing system and using method thereof Download PDFInfo
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- CN113445997A CN113445997A CN202110901402.9A CN202110901402A CN113445997A CN 113445997 A CN113445997 A CN 113445997A CN 202110901402 A CN202110901402 A CN 202110901402A CN 113445997 A CN113445997 A CN 113445997A
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- 238000007789 sealing Methods 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000004088 simulation Methods 0.000 title claims abstract description 16
- 238000012856 packing Methods 0.000 title claims abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 100
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 99
- 239000010959 steel Substances 0.000 claims abstract description 99
- 238000001514 detection method Methods 0.000 claims abstract description 87
- 238000009434 installation Methods 0.000 claims description 18
- 230000001681 protective effect Effects 0.000 claims description 9
- 238000013461 design Methods 0.000 description 7
- 238000012360 testing method Methods 0.000 description 6
- 238000005259 measurement Methods 0.000 description 4
- 208000010392 Bone Fractures Diseases 0.000 description 3
- 206010017076 Fracture Diseases 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000005755 formation reaction Methods 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 238000005553 drilling Methods 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- 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
- 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 OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
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- 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
- E21B2200/00—Special features related to earth drilling for obtaining oil, gas or water
- E21B2200/20—Computer models or simulations, e.g. for reservoirs under production, drill bits
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- Geochemistry & Mineralogy (AREA)
- Examining Or Testing Airtightness (AREA)
Abstract
The invention discloses a high-pressure airtight simulation device of an underground packing system and a using method thereof, wherein the simulation device comprises a steel pipe body, and a first detection assembly is arranged on the outer side of the steel pipe body; an upper packer assembly and a lower packer assembly are arranged in the steel pipe body, and the upper packer assembly is communicated with the lower packer assembly through a communicating perforated pipe and a high-pressure connecting pipe; be provided with on the intercommunication floral tube and detect the apopore, the steel body middle part outside is provided with the second determine module. The using method comprises the following steps: s1, mounting a first detection assembly and a second detection assembly on the steel pipe body; s2, installing an upper packer assembly and a lower packer assembly; s3, plugging the lower packer assembly and the upper packer assembly into the steel pipe body; s4, injecting water into the upper packer assembly and the lower packer assembly; s5, injecting water into the fracturing section; s6, judging the sealing performance of the upper packer assembly and the lower packer assembly; and S7, taking out the upper packer assembly and the lower packer assembly.
Description
Technical Field
The invention relates to the field of geological detection, in particular to a high-pressure airtight simulation device of an underground packing system and a using method thereof.
Background
The method has been further refined and popularized since the initiative to measure the stress using the hydraulic fracturing method. The Hydraulic Fracturing (HF) and primary fracture hydraulic fracturing tests (HTPF) currently carried out in boreholes are very effective means of determining the full stress tensor, and are one of the methods recommended by the international society of rock mechanics for determining the crustal stress.
Over the past 20 years, this method has been widely used for engineering designs developed in various geological formations, such as nuclear waste underground storage, hydroelectric power stations, high-speed rail tunnels, and the like. These results provide a unique data support in determining the effectiveness of the ground stress.
The hydraulic fracturing method comprises a pair of bridging packers, wherein the packers are pressurized and then sealed into a section of drilled hole, and then the sealed section is injected with liquid and pressurized until the hole wall is broken and extends; when a group of cross-shooting packer-sealed hole sections are pressurized, a pressure-time recording curve is recorded, the fracture pressure, the re-tensioning pressure and the closing pressure of the measured section can be determined according to the measuring curve, and the maximum horizontal principal stress can be obtained by utilizing the value calculation of the closing pressure. The direction of the maximum principal stress can be determined using an automatic orientation stamp at a range where the fracture pressure is significant. The hydrofracturing method is simple in operation, and the ground stress value can be determined without the need of rock mechanical parameters, so that the hydrofracturing method has the advantages of deep measurement depth and the like, and is widely applied to large-scale projects at home and abroad.
However, under the actual test condition, because the sealing performance of the packer under the high-pressure working condition is unknown, if the sealing performance of the packer is poor under the high-pressure condition, the phenomenon that a fracturing section leaks water or the packer cannot be fixed on the hole wall occurs, and the test is forced to fail; and if the water leakage is less, the instantaneous closing pressure is smaller than the true value, thereby influencing the ground stress measurement result. Therefore, it is necessary to develop an analog testing device for testing the sealing performance of the packer to avoid the above problems.
Disclosure of Invention
The invention aims to solve the problems and provides a high-pressure sealing simulation device of an underground packing system, which is simple in structure and convenient to operate, and a using method thereof.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a high-pressure airtight simulation device of an underground packing system comprises a steel pipe body, wherein the steel pipe body is in a round pipe shape with one sealed end, and a first detection assembly communicated with the steel pipe body is arranged outside the sealed end of the steel pipe body; an upper packer assembly and a lower packer assembly are arranged inside the steel pipe body, one end of the upper packer assembly is communicated with the water inlet drill rod and the water inlet mounting pipe, the other end of the upper packer assembly is communicated with one end of the lower packer assembly through a communicating perforated pipe and a high-pressure connecting pipe, and the other end of the lower packer assembly is plugged; the communicating perforated pipe is provided with a detection water hole communicated with the inside of the steel pipe body, a second detection assembly communicated with the steel pipe body is arranged on the outer side of the middle of the steel pipe body, and the second detection assembly is arranged between the upper packer assembly and the lower packer assembly.
Furthermore, the upper packer assembly and the lower packer assembly both comprise rubber cylinders, central connecting pipes are inserted in the rubber cylinders, and two ends of each rubber cylinder are symmetrically provided with a protective steel sleeve, a connecting steel body and a fixing head; the fixed head is in a threaded tubular shape, two ends of the rubber cylinder are sleeved on the outer side of the fixed head, the inner side wall of the rubber cylinder is in threaded connection with the outer side wall of the fixed head, the outer sides of the two ends of the rubber cylinder are sleeved with the protective steel sleeves, the connecting steel body is in a tubular shape, the connecting steel body is sleeved on the outer side of the central connecting pipe, the inner side wall of the connecting steel body is connected with the outer side wall of the central connecting pipe, one end of the connecting steel body is embedded between the outer side wall of the fixed head and the inner side wall of the protective steel sleeves, and the other end of the connecting steel body is provided with an installation cavity and is communicated with the pipeline connecting piece through the installation cavity; a water passing gap is arranged between the inner side wall of the rubber pipe and the outer side wall of the central connecting pipe, and the water passing gap is communicated with the mounting cavity.
Furthermore, a water inlet channel is arranged in the water inlet drill rod, one end of the water inlet drill rod is connected with one end of a central connecting pipe in the upper packer assembly, the water inlet channel is communicated with the interior of the central connecting pipe, and the other end of the central connecting pipe is communicated with the lower packer assembly through a communicating perforated pipe; one end of the water inlet installation pipe is communicated with a pipeline connecting piece at one end of the upper packer assembly, and the pipeline connecting piece at the other end of the upper packer assembly is communicated with the lower packer assembly through a high-pressure connecting pipe.
Furthermore, one end of a central connecting pipe in the lower packer assembly is communicated with one end of a communicating perforated pipe, and the other end of the central connecting pipe is blocked; and the pipeline connecting piece at one end of the lower packer assembly is communicated with one end of the high-pressure connecting pipe, and the pipeline connecting piece at the other end of the lower packer assembly is used for plugging.
Further, the first detection assembly comprises a first pressure sensor and a first pressure gauge, and the first pressure sensor and the first pressure gauge are communicated with the interior of the steel pipe body; the second detection assembly comprises a second pressure sensor and a second pressure gauge, and the second pressure sensor and the second pressure gauge are communicated with the interior of the steel pipe body; and the mounting pipelines of the first pressure gauge and the second pressure gauge are respectively provided with a high-pressure ball valve, and the first pressure sensor and the second pressure sensor are respectively connected with the signal input end of the computer.
A use method of a high-pressure closed simulation device of a downhole packing system comprises the following steps:
s1, mounting a first detection assembly and a second detection assembly on the steel pipe body, and connecting a first pressure sensor in the first detection assembly and a second pressure sensor in the second detection assembly with a signal input end of a computer;
s2, communicating one end of the upper packer assembly with the water inlet drill rod and the water inlet installation pipe, communicating the other end of the upper packer assembly with one end of the lower packer assembly by using a connecting and communicating perforated pipe and a high-pressure connecting pipe, and then plugging the other end of the lower packer assembly;
s3, injecting water into the steel pipe body, opening high-pressure ball valves in the first detection assembly and the second detection assembly, and sequentially plugging the lower packer assembly and the upper packer assembly into the steel pipe body to enable the second detection assembly to be located between the lower packer assembly and the upper packer assembly;
s4, closing the high-pressure ball valves in the first detection assembly and the second detection assembly; then injecting high-pressure water into the water inlet installation pipe by using a high-pressure pump, gradually increasing the pressure from 5MPa to 20MPa, increasing the pressure by 5MPa every 10 minutes, and enabling the high-pressure water to sequentially flow through a water passing gap in the upper packer component, a high-pressure connecting pipe and a water passing gap in the lower packer component; under the action of high-pressure water, the rubber cylinders in the upper packer assembly and the lower packer assembly are subjected to expansion deformation, so that the outer side wall of each rubber cylinder is in close contact with the inner side wall of the steel pipe body, and a closed space is formed inside the steel pipe body between the upper packer assembly and the lower packer assembly;
s5, injecting high-pressure water into the water inlet channel in the water inlet drill rod by using a high-pressure pump, and increasing the pressure by 5MPa every 10 minutes until the pressure reaches 18 MPa; high-pressure water sequentially passes through the water inlet channel, the central connecting pipe in the upper packer assembly and the communicating perforated pipe and then flows into the closed space from the detected water hole;
s6, in the operation process of the step S5, the pressure of the middle part and the bottom of the steel pipe body is detected through the first detection assembly and the second detection assembly; in the pressurization stage, when the detection numerical values of the first detection assembly and the second detection assembly are not reduced, the sealing performance of the upper packer assembly and the lower packer assembly is good; when the detection values of the first detection assembly and the second detection assembly are reduced, the sealing performance of the upper packer assembly and the sealing performance of the lower packer assembly are required to be enhanced, and the sealing performance of the upper packer assembly and the lower packer assembly is required to be enhanced;
s7, after the detection is finished, opening the high-pressure ball valve and the drain valve arranged on the high-pressure pump, naturally recovering the pressure in the upper packer assembly and the lower packer assembly to the original state, and then taking the upper packer assembly and the lower packer assembly out of the steel pipe body.
Compared with the prior art, the invention has the advantages and positive effects that:
according to the invention, through the design that the upper packer assembly and the lower packer assembly are arranged in the steel pipe body and are communicated through the communicating perforated pipe and the high-pressure connecting pipe, people can conveniently inject water into the steel pipe body between the upper packer assembly and the lower packer assembly and between the upper packer assembly and the lower packer assembly through the water inlet mounting pipe and the water inlet drill rod; meanwhile, the design that the first detection assembly is arranged at the sealing end of the steel pipe body enables the first detection assembly to simulate and detect the water pressure at the bottom of the drill hole, and the difficulty degree of the pressure difference on the formation of the drill lifting operation is considered according to the upper and lower pressure difference in the drill hole obtained through simulation; the design that a second detection assembly is arranged between the upper packer assembly and the lower packer assembly can detect the pressure value of the fracturing section, and the sealing performance of the upper packer assembly and the lower packer assembly and the stability of the connection structure of the upper packer assembly and the lower packer assembly with the steel pipe body can be detected according to the change of the pressure value; the device is simple to operate, convenient and fast, the sealing performance of the upper packer assembly and the lower packer assembly in a drill hole can be effectively detected in a simulated mode, the condition that the ground stress measurement result is inaccurate due to water leakage of the upper packer assembly and the lower packer assembly in actual operation is avoided, and convenience is brought to geological detection work.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural view of an upper packer assembly.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived from the embodiments of the present invention by a person skilled in the art without any creative effort, should be included in the protection scope of the present invention.
As shown in fig. 1 and fig. 2, the embodiment discloses a high-pressure sealing simulation device for an underground packer system, which includes a steel pipe body 1, wherein the steel pipe body 1 is in a shape of a circular pipe with one end sealed, and a first detection assembly communicated with the steel pipe body 1 is arranged outside the sealed end of the steel pipe body 1; an upper packer assembly 2 and a lower packer assembly 3 are arranged inside the steel pipe body 1, one end of the upper packer assembly 2 is communicated with a water inlet drill rod 4 and a water inlet installation pipe 5, the other end of the upper packer assembly 2 is communicated with one end of the lower packer assembly 3 through a communicating perforated pipe 7 and a high-pressure connecting pipe 6, and the other end of the lower packer assembly 3 is plugged; the communicating perforated pipe 7 is provided with a detection water hole 701 communicated with the interior of the steel pipe body 1, a second detection assembly communicated with the steel pipe body 1 is arranged on the outer side of the middle of the steel pipe body 1, and the second detection assembly is arranged between the upper packer assembly 2 and the lower packer assembly 3.
The upper packer assembly 2 and the lower packer assembly 3 both comprise rubber cylinders 201, central connecting pipes 204 are inserted in the rubber cylinders 201, and two ends of each rubber cylinder 201 are symmetrically provided with a protective steel sleeve 203, a connecting steel body 205 and a fixing head 202; the fixed head 202 is in a threaded pipe shape, two ends of the rubber cylinder 201 are sleeved on the outer side of the fixed head 202, the inner side wall of the rubber cylinder 201 is in threaded connection with the outer side wall of the fixed head 202, the outer sides of the two ends of the rubber cylinder 201 are sleeved with the protective steel sleeves 203, the connecting steel body 205 is in a pipe shape, the connecting steel body 205 is sleeved on the outer side of the central connecting pipe 204, the inner side wall of the connecting steel body 205 is connected with the outer side wall of the central connecting pipe 204, one end of the connecting steel body 205 is embedded between the outer side wall of the fixed head 202 and the inner side wall of the protective steel sleeves 203, and the other end of the connecting steel body 205 is provided with an installation cavity 206 and is communicated with the pipeline connecting piece 208 through the installation cavity 206; a water passing gap 207 is arranged between the inner side wall of the rubber pipe 201 and the outer side wall of the central connecting pipe 204, and the water passing gap 207 is communicated with the mounting cavity 206.
The water passing gap is used for supplying water to the upper packer assembly and the lower packer assembly and enabling rubber cylinders in the upper packer assembly and the lower packer assembly to expand, so that a sealing state is formed between the outer side wall of each rubber cylinder and the inner side wall of the steel pipe body;
a water inlet channel is arranged in the water inlet drill rod 4, one end of the water inlet drill rod 4 is connected with one end of a central connecting pipe 204 in the upper packer assembly 2, the water inlet channel is communicated with the inside of the central connecting pipe 204, and the other end of the central connecting pipe 204 is communicated with the lower packer assembly 3 through a communicating perforated pipe 7; one end of the water inlet installation pipe 5 is communicated with the pipeline connecting piece 208 at one end of the upper packer assembly 2, and the pipeline connecting piece at the other end of the upper packer assembly 2 is communicated with the lower packer assembly 3 through the high-pressure connecting pipe 6.
One end of a central connecting pipe in the lower packer component 3 is communicated with one end of a communicating perforated pipe 7, and the other end of the central connecting pipe is blocked; and the pipeline connecting piece at one end of the lower packer assembly 3 is communicated with one end of the high-pressure connecting pipe 6, and the pipeline connecting piece at the other end of the lower packer assembly 3 is used for plugging.
The water inlet installation pipe, the water passing gap in the upper packer assembly, the high-pressure connecting pipe and the water passing gap in the lower packer assembly form a packer water injection channel together, so that water injection operation is performed on the upper packer assembly and the lower packer assembly; the water inlet drill rod, the central connecting pipe and the communicating perforated pipe form a detection water injection channel, so that water pressure is formed in the steel pipe body between the upper packer assembly and the lower packer assembly, and the sealing performance of the upper packer assembly and the lower packer assembly is detected;
the first detection assembly comprises a first pressure sensor 8 and a first pressure gauge 9, and the first pressure sensor 8 and the first pressure gauge 9 are communicated with the interior of the steel pipe body 1; the second detection assembly comprises a second pressure sensor 11 and a second pressure gauge 12, and the second pressure sensor 11 and the second pressure gauge 12 are both communicated with the interior of the steel pipe body 1; and the installation pipelines of the first pressure gauge 9 and the second pressure gauge 12 are respectively provided with a high-pressure ball valve 10, and the first pressure sensor 8 and the second pressure sensor 11 are respectively connected with the signal input end of the computer.
The upper packer assembly and the lower packer assembly can be conveniently plugged into the steel pipe body through the opening and closing operation of the high-pressure ball valve; simultaneously through the end of sealing at the steel body retaining and use first detection element to detect its water pressure, can simulate out the pressure value of drilling bottom, made things convenient for people's drilling rod to take out the operation.
A use method of a high-pressure closed simulation device of a downhole packing system comprises the following steps:
s1, mounting a first detection assembly and a second detection assembly on the steel pipe body 1, and connecting a first pressure sensor 8 in the first detection assembly and a second pressure sensor 11 in the second detection assembly with a signal input end of a computer;
s2, communicating one end of the upper packer assembly 2 with the water inlet drill rod 4 and the water inlet installation pipe 5, communicating the other end of the upper packer assembly 2 with one end of the lower packer assembly 3 by using a connecting and communicating perforated pipe 7 and a high-pressure connecting pipe 6, and then plugging the other end of the lower packer assembly 3;
s3, injecting water into the steel pipe body 1, then opening the high-pressure ball valves 10 in the first detection assembly and the second detection assembly, and sequentially plugging the lower packer assembly 3 and the upper packer assembly 2 into the steel pipe body 1 to enable the second detection assembly to be located between the lower packer assembly 3 and the upper packer assembly 2;
s4, closing the high-pressure ball valve 10 in the first detection assembly and the second detection assembly; then injecting high-pressure water into the water inlet installation pipe 5 by using a high-pressure pump, gradually increasing the pressure from 5MPa to 20MPa, increasing the pressure by 5MPa every 10 minutes, and collecting the pressure change condition of each pressure stage; high-pressure water sequentially flows through the water passing gap 207 in the upper packer component 2, the high-pressure connecting pipe 6 and the water passing gap in the lower packer component 3; under the action of high-pressure water, the rubber cylinders 201 in the upper packer assembly 2 and the rubber cylinders in the lower packer assembly 3 are subjected to expansion deformation, so that the outer side walls of the rubber cylinders are tightly contacted with the inner side walls of the steel pipe body 1, and a closed space (namely a fracturing section) is formed inside the steel pipe body 1 between the upper packer assembly 2 and the lower packer assembly 3;
s5, injecting high-pressure water into the water inlet channel in the water inlet drill rod 4 by using a high-pressure pump, increasing the pressure by 5MPa every 10 minutes until the pressure reaches 18MPa, and collecting the pressure change condition of each pressure stage; high-pressure water flows into the closed space from the detection water hole 701 after sequentially passing through the water inlet channel, the central connecting pipe 204 in the upper packer component 2 and the communicating perforated pipe 7;
s6, in the operation process of the step S5, the pressure of the middle part and the bottom of the steel pipe body 1 is detected through the first detection assembly and the second detection assembly; in the pressurization stage, when the detection numerical values of the first detection assembly and the second detection assembly are not reduced, the sealing performance of the upper packer assembly 2 and the lower packer assembly 3 is good; when the detection values of the first detection assembly and the second detection assembly are reduced, the sealing performance of the upper packer assembly 2 and the lower packer assembly 3 is poor, and the sealing performance of the upper packer assembly 2 and the lower packer assembly 3 needs to be enhanced;
s7, after the detection is finished, the high-pressure ball valve 10 and a drain valve arranged on the high-pressure pump are opened, so that the pressure in the upper packer assembly 2 and the pressure in the lower packer assembly 3 are naturally restored to the original state, and then the upper packer assembly 2 and the lower packer assembly 3 are taken out from the steel pipe body 1.
The main body of the packer is a steel pipe body, can bear pressure over 70MPa, and can simulate the long-time working state of the packer over 25 MPa; meanwhile, a pressure gauge and a sensor are arranged on a fracturing section (namely a steel pipe body part between the upper packer assembly and the lower packer assembly), so that the pressure change of the fracturing section can be monitored in real time, and a fracturing change signal can be transmitted to a computer end by using the pressure sensor to be collected. In addition, the pressure gauge and the sensor are arranged at the bottom of the sealing end of the steel pipe body, so that the difficulty that the upper pressure difference and the lower pressure difference possibly form a test device when the packer assembly is close to the bottom of a drill hole to perform an experiment can be simulated, and the simulation effect of the packer assembly is further verified.
According to the invention, through the design that the upper packer assembly and the lower packer assembly are arranged in the steel pipe body and are communicated through the communicating perforated pipe and the high-pressure connecting pipe, people can conveniently inject water into the steel pipe body between the upper packer assembly and the lower packer assembly and between the upper packer assembly and the lower packer assembly through the water inlet mounting pipe and the water inlet drill rod; meanwhile, the design that the first detection assembly is arranged at the sealing end of the steel pipe body enables the first detection assembly to simulate and detect the water pressure at the bottom of the drill hole, and the difficulty degree of the pressure difference on the formation of the drill lifting operation is considered according to the upper and lower pressure difference in the drill hole obtained through simulation; the design that a second detection assembly is arranged between the upper packer assembly and the lower packer assembly can detect the pressure value of the fracturing section, and the sealing performance of the upper packer assembly and the lower packer assembly and the stability of the connection structure of the upper packer assembly and the lower packer assembly with the steel pipe body can be detected according to the change of the pressure value; the device is simple to operate, convenient and fast, the sealing performance of the upper packer assembly and the lower packer assembly in a drill hole can be effectively detected in a simulated mode, the condition that the ground stress measurement result is inaccurate due to water leakage of the upper packer assembly and the lower packer assembly in actual operation is avoided, and convenience is brought to geological detection work.
Claims (6)
1. The utility model provides a sealed analogue means of underground packing system high pressure which characterized in that: the high-pressure airtight simulation device for the underground packing system comprises a steel pipe body, wherein one end of the steel pipe body is sealed and is in a round pipe shape, and a first detection assembly communicated with the steel pipe body is arranged outside the sealed end of the steel pipe body; an upper packer assembly and a lower packer assembly are arranged inside the steel pipe body, one end of the upper packer assembly is communicated with the water inlet drill rod and the water inlet mounting pipe, the other end of the upper packer assembly is communicated with one end of the lower packer assembly through a communicating perforated pipe and a high-pressure connecting pipe, and the other end of the lower packer assembly is plugged; the communicating perforated pipe is provided with a detection water hole communicated with the inside of the steel pipe body, a second detection assembly communicated with the steel pipe body is arranged on the outer side of the middle of the steel pipe body, and the second detection assembly is arranged between the upper packer assembly and the lower packer assembly.
2. The high pressure containment simulation device of a downhole packing system of claim 1, wherein: the upper packer assembly and the lower packer assembly both comprise rubber cylinders, central connecting pipes are inserted in the rubber cylinders, and two ends of each rubber cylinder are symmetrically provided with a protective steel sleeve, a connecting steel body and a fixing head; the fixed head is in a threaded tubular shape, two ends of the rubber cylinder are sleeved on the outer side of the fixed head, the inner side wall of the rubber cylinder is in threaded connection with the outer side wall of the fixed head, the outer sides of the two ends of the rubber cylinder are sleeved with the protective steel sleeves, the connecting steel body is in a tubular shape, the connecting steel body is sleeved on the outer side of the central connecting pipe, the inner side wall of the connecting steel body is connected with the outer side wall of the central connecting pipe, one end of the connecting steel body is embedded between the outer side wall of the fixed head and the inner side wall of the protective steel sleeves, and the other end of the connecting steel body is provided with an installation cavity and is communicated with the pipeline connecting piece through the installation cavity; a water passing gap is arranged between the inner side wall of the rubber pipe and the outer side wall of the central connecting pipe, and the water passing gap is communicated with the mounting cavity.
3. The high pressure containment simulation device of a downhole packing system of claim 2, wherein: a water inlet channel is arranged in the water inlet drill rod, one end of the water inlet drill rod is connected with one end of a central connecting pipe in the upper packer assembly, the water inlet channel is communicated with the interior of the central connecting pipe, and the other end of the central connecting pipe is communicated with the lower packer assembly through a communicating perforated pipe; one end of the water inlet installation pipe is communicated with a pipeline connecting piece at one end of the upper packer assembly, and the pipeline connecting piece at the other end of the upper packer assembly is communicated with the lower packer assembly through a high-pressure connecting pipe.
4. The downhole packing system high pressure containment simulator of claim 3, wherein: one end of a central connecting pipe in the lower packer assembly is communicated with one end of the communicating perforated pipe, and the other end of the central connecting pipe is plugged; and the pipeline connecting piece at one end of the lower packer assembly is communicated with one end of the high-pressure connecting pipe, and the pipeline connecting piece at the other end of the lower packer assembly is used for plugging.
5. The downhole packing system high pressure containment simulator of claim 4, wherein: the first detection assembly comprises a first pressure sensor and a first pressure gauge, and the first pressure sensor and the first pressure gauge are communicated with the interior of the steel pipe body; the second detection assembly comprises a second pressure sensor and a second pressure gauge, and the second pressure sensor and the second pressure gauge are communicated with the interior of the steel pipe body; and the mounting pipelines of the first pressure gauge and the second pressure gauge are respectively provided with a high-pressure ball valve, and the first pressure sensor and the second pressure sensor are respectively connected with the signal input end of the computer.
6. A method of using the downhole packing system high pressure containment simulator of claim 5, wherein: the method comprises the following steps:
s1, mounting a first detection assembly and a second detection assembly on the steel pipe body, and connecting a first pressure sensor in the first detection assembly and a second pressure sensor in the second detection assembly with a signal input end of a computer;
s2, communicating one end of the upper packer assembly with the water inlet drill rod and the water inlet installation pipe, communicating the other end of the upper packer assembly with one end of the lower packer assembly by using a connecting and communicating perforated pipe and a high-pressure connecting pipe, and then plugging the other end of the lower packer assembly;
s3, injecting water into the steel pipe body, opening high-pressure ball valves in the first detection assembly and the second detection assembly, and sequentially plugging the lower packer assembly and the upper packer assembly into the steel pipe body to enable the second detection assembly to be located between the lower packer assembly and the upper packer assembly;
s4, closing the high-pressure ball valves in the first detection assembly and the second detection assembly; then injecting high-pressure water into the water inlet installation pipe by using a high-pressure pump, gradually increasing the pressure from 5MPa to 20MPa, increasing the pressure by 5MPa every 10 minutes, and enabling the high-pressure water to sequentially flow through a water passing gap in the upper packer component, a high-pressure connecting pipe and a water passing gap in the lower packer component; under the action of high-pressure water, the rubber cylinders in the upper packer assembly and the lower packer assembly are subjected to expansion deformation, so that the outer side wall of each rubber cylinder is in close contact with the inner side wall of the steel pipe body, and a closed space is formed inside the steel pipe body between the upper packer assembly and the lower packer assembly;
s5, injecting high-pressure water into the water inlet channel in the water inlet drill rod by using a high-pressure pump, and increasing the pressure by 5MPa every 10 minutes until the pressure reaches 18 MPa; high-pressure water sequentially passes through the water inlet channel, the central connecting pipe in the upper packer assembly and the communicating perforated pipe and then flows into the closed space from the detected water hole;
s6, in the operation process of the step S5, the pressure of the middle part and the bottom of the steel pipe body is detected through the first detection assembly and the second detection assembly; in the pressurization stage, when the detection numerical values of the first detection assembly and the second detection assembly are not reduced, the sealing performance of the upper packer assembly and the lower packer assembly is good; when the detection values of the first detection assembly and the second detection assembly are reduced, the sealing performance of the upper packer assembly and the sealing performance of the lower packer assembly are required to be enhanced, and the sealing performance of the upper packer assembly and the lower packer assembly is required to be enhanced;
s7, after the detection is finished, opening the high-pressure ball valve and the drain valve arranged on the high-pressure pump, naturally recovering the pressure in the upper packer assembly and the lower packer assembly to the original state, and then taking the upper packer assembly and the lower packer assembly out of the steel pipe body.
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