CN109113687A - Sand filling pipe device and filling method for simulated rock core - Google Patents
Sand filling pipe device and filling method for simulated rock core Download PDFInfo
- Publication number
- CN109113687A CN109113687A CN201710497409.2A CN201710497409A CN109113687A CN 109113687 A CN109113687 A CN 109113687A CN 201710497409 A CN201710497409 A CN 201710497409A CN 109113687 A CN109113687 A CN 109113687A
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- Prior art keywords
- sand
- fill out
- quartz sand
- tube
- sealing cover
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- 239000004576 sand Substances 0.000 title claims abstract description 158
- 238000000034 method Methods 0.000 title claims abstract description 42
- 239000011435 rock Substances 0.000 title abstract description 16
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 262
- 239000006004 Quartz sand Substances 0.000 claims abstract description 96
- 238000007789 sealing Methods 0.000 claims description 55
- 238000004088 simulation Methods 0.000 claims description 47
- 239000012530 fluid Substances 0.000 claims description 6
- 230000000903 blocking effect Effects 0.000 abstract description 15
- 238000010008 shearing Methods 0.000 abstract description 15
- 230000008569 process Effects 0.000 abstract description 8
- 238000002347 injection Methods 0.000 abstract description 6
- 239000007924 injection Substances 0.000 abstract description 6
- 238000011084 recovery Methods 0.000 abstract description 3
- 238000006073 displacement reaction Methods 0.000 description 11
- 239000010453 quartz Substances 0.000 description 9
- 230000035699 permeability Effects 0.000 description 8
- 230000000694 effects Effects 0.000 description 6
- 238000002474 experimental method Methods 0.000 description 6
- 239000000243 solution Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000006872 improvement Effects 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
- 238000004891 communication Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920001568 phenolic resin Polymers 0.000 description 1
- 239000005011 phenolic resin Substances 0.000 description 1
- 229920002401 polyacrylamide Polymers 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000009738 saturating Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
-
- 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
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention discloses a sand filling pipe device and a filling method for a simulated rock core, and belongs to the technical field of oilfield enhanced recovery. According to the sand filling pipe device for the simulated core, a pipe section which extends outwards from one end of the pipe column body and has a gradually increased pipe diameter is arranged on the pipe column body of the sand filling pipe, first quartz sand with a first preset mesh, second quartz sand with a second preset mesh and third quartz sand with a third preset mesh are sequentially filled in the pipe section to form a first quartz sand layer, a second quartz sand layer and a third quartz sand layer, stratum sand is filled in the pipe column body to form a stratum sand layer, an interface is formed between the stratum sand layer and the third quartz sand layer, the formed first quartz sand layer, second quartz sand layer and third quartz sand layer can be used for replacing a compact screen, the interface replaces the end face of the sand filling pipe, the blocking and shearing of continuous gel in the continuous gel injection process are reduced, and the replacing and blocking effects of the continuous gel are improved.
Description
Technical field
The invention belongs to technical field of oilfield recovery percent improvement, in particular to the back-up sand pipe device of a kind of simulation core and fill out
Method processed.
Background technique
Fill out sand tube rock core displacement test is a kind of current domestic common raising recovery ratio experimental method, and this method can benefit
Rock core displacement test is carried out with the mode of the parameters such as approximate simulation test block in-place permeability, porosity, it can after the completion of experiment
It is filled and presented again again after reservoir sand in fill out sand tube rock core is taken out, saves experimental cost.
Currently, the back-up sand pipe device of conventional simulation rock core is straight barrel type, the both ends of the back-up sand pipe device of simulation core in order to
It prevents reservoir sand excessive, is equipped with solid filter sieve in two end faces of the back-up sand pipe device of simulation core, simulation core
Back-up sand pipe device, come parameters such as approximate simulation in-place permeability, porositys, it is real to carry out rock core displacement using the method that back-up sand is compacted
It tests.
In the implementation of the present invention, the inventors discovered that in the prior art the prior art has at least the following problems:
The back-up sand pipe device of existing simulation core is during continuous gel placement, since the presence of fine and close sieve causes
End face blocking, can not simulate and be actually implanted into situation, meanwhile, the presence of sieve causes serious shearing to continuous gel, reduces
The displacement of continuous gel and plugging effect do not have also a set of at present so that experimental result and being actually implanted into that there is some difference
Easy, the maneuverable fill out sand tube rock core of process fills and presents method to solve the problems, such as end face blocking and shearing.
Summary of the invention
In consideration of it, the present invention provides a kind of back-up sand pipe device of simulation core and fills and presents method, for reducing back-up sand pipe end
In face of the blocking and shearing of continuous gel.
Specifically, including technical solution below:
On the one hand, the back-up sand pipe device of a kind of simulation core, the back-up sand pipe device of the simulation core include sealing cover and
Fill out sand tube, wherein
The sealing cover includes the first sealing cover and the second sealing cover, and first sealing cover is set in the fill out sand tube
First end, second sealing cover are set in the second end of the fill out sand tube；
First sealing cover offers first through hole, for injecting fluid into the fill out sand tube；
Second sealing cover offers the second through-hole, the fluid for being discharged in the fill out sand tube,
The fill out sand tube includes tubular column main body and extends outwardly from one end of the tubular column main body and caliber is gradually increased
Pipeline section, the port of the pipeline section are the first end of the fill out sand tube, and the tubular column main body is suitable for filling and presenting reservoir sand, and the pipeline section is suitable
In the multiple quartz sand layers filling and presenting the mesh number from the first end and successively increasing.
Further, first sealing cover includes the first capping and covers from first capping edge to described first
The first cover rim that the vertical direction in face direction extends, the inner wall of first cover rim offer the first groove, and described first recessed
The first sealing ring is provided in slot.
Further, second sealing cover includes the second capping and covers from second capping edge to described second
The second cover rim that the vertical direction in face direction extends, the inner wall of second cover rim offer the second groove, and described second recessed
Second sealing ring is provided in slot.
Further, the area of first capping is greater than the area of second capping.
Further, it is equipped with the first external screw thread on the outside of the first end of the fill out sand tube, the inner wall of first sealing cover is set
There is the first internal screw thread, first internal screw thread is suitable for cooperating with first external screw thread.
Further, it is equipped with the second external screw thread on the outside of the second end of the fill out sand tube, the inner wall of second sealing cover is set
There is the second internal screw thread, second internal screw thread is suitable for cooperating with second external screw thread.
Further, the length value range of the tubular column main body is 250-350mm, the value model of the length of the pipeline section
It encloses for 25-35mm.
On the other hand, a kind of fill out sand tube of simulation core fills and presents method, back-up sand pipe device based on above-mentioned simulation core,
The method of filling and presenting includes:
Connect and seal the first end of first sealing cover and the fill out sand tube；
First quartz sand of the first default mesh number is injected into the fill out sand tube from the second end of the fill out sand tube, is pressed into
First quartz sand layer；
Second quartz sand of the second default mesh number is injected into the fill out sand tube from the second end of the fill out sand tube, is pressed into
The second quartz sand layer on first quartz sand layer；
The third quartz sand that third presets mesh number is injected into the fill out sand tube from the second end of the fill out sand tube, is pressed into
Third quartz sand layer on second quartz sand layer；
Reservoir sand is injected into the fill out sand tube from the second end of the fill out sand tube, is pressed into positioned at the third quartz sand
Stratum layer of sand on layer,
Wherein first quartz sand layer, second quartz sand layer and third quartz sand layer are located in the pipeline section；Institute
The first default mesh number is stated less than the described second default mesh number, the second default mesh number is less than the third and presets mesh number, described
Third presets the mesh number that mesh number is less than the reservoir sand.
Further, the interface of the third quartz sand layer and the stratum layer of sand be located at the tubular column main body with it is described
The boundary of pipeline section.
Further, one or more quartz sands that mesh number increases from bottom to up are additionally provided on the third quartz sand layer
Layer.
Technical solution provided in an embodiment of the present invention the utility model has the advantages that
Extended outwardly from one end of tubular column main body and caliber is gradually increased by being provided in the tubular column main body of fill out sand tube
Pipeline section, the first quartz sand of the first default mesh number, the second quartz sand of the second default mesh number and are successively filled and presented in pipeline section
The third quartz sand of three default mesh numbers forms the first quartz sand layer, the second quartz sand layer and third quartz sand layer, in tubular column main body
Reservoir sand is inside filled and presented, stratum layer of sand is formed, forms interface between stratum layer of sand and third quartz sand layer, can use to be formed
The first quartz sand layer, the second quartz sand layer and third quartz sand layer replace fine and close sieve, interface replaces back-up sand end surfaces, subtracts
Lack the blocking and shearing in continuous gel injection process to continuous gel, improve the displacement of continuous gel and blocks effect
Fruit.
Detailed description of the invention
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment
Attached drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for
For those of ordinary skill in the art, without creative efforts, it can also be obtained according to these attached drawings other
Attached drawing.
Fig. 1 is a kind of structural schematic diagram of the back-up sand pipe device of simulation core of the embodiment of the present invention；
Fig. 2 is a kind of method flow diagram for filling and presenting method of the fill out sand tube of simulation core of the embodiment of the present invention.
Appended drawing reference in figure respectively indicates:
1, the first sealing cover；
1-1, first through hole；
2, fill out sand tube；
2-1, tubular column main body；
2-2, pipeline section；
3, the second sealing cover；
3-1, the second through-hole.
Specific embodiment
To keep technical solution of the present invention and advantage clearer, below in conjunction with attached drawing to embodiment of the present invention make into
One step it is described in detail.
Embodiment one
The embodiment of the invention provides a kind of back-up sand pipe device of simulation core, structural schematic diagram is as shown in Figure 1, main
Including sealing cover and fill out sand tube 2, wherein
Sealing cover includes the first sealing cover 1 and the second sealing cover 3, and the first sealing cover 1 is set in the first end of fill out sand tube 2,
Second sealing cover 3 is set in the second end of fill out sand tube 2；
First sealing cover 1 offers first through hole 1-1, for injecting fluid into fill out sand tube 2；
Second sealing cover 3 offers the second through-hole 3-1, the fluid for being discharged in fill out sand tube 2,
Fill out sand tube 2 includes tubular column main body 2-1 and extends outwardly from one end of tubular column main body 2-1 and pipe that caliber is gradually increased
The port of section 2-2, pipeline section 2-2 are the first end of fill out sand tube 2, and tubular column main body 2-1 is suitable for filling and presenting reservoir sand, and pipeline section 2-2 is suitable for filling out
System multiple quartz sand layers that mesh number successively increases from first end.
Accordingly, with respect to the back-up sand pipe device of original simulation core, the fill out sand tube 2 of the back-up sand pipe device of the simulation core
Not only include tubular column main body 2-1, further include extending outwardly from one end of tubular column main body 2-1 and pipeline section 2-2 that caliber is gradually increased,
Using filling and presenting the quartz sand of multiple default mesh numbers in pipeline section 2-2, and multiple quartz sand layers are formed to replace fine and close sieve, expand
The flow area of continuous gel, and then reduce the blocking and shearing in continuous gel injection process to continuous gel, it mentions
The displacement of high continuous gel and plugging effect.
In the back-up sand pipe device of the simulation core of the embodiment of the present invention, the preferably circular tubing string of tubular column main body 2-1, pipeline section
2-2 is preferably round table-like.
In the back-up sand pipe device of the simulation core of the embodiment of the present invention, the first sealing cover 1 includes the first capping and from the
The first cover rim that one capping edge extends to the direction vertical with the first capping direction, it is recessed that the inner wall of the first cover rim offers first
Slot, and the first sealing ring is provided in the first groove, for ensuring the close close of the first sealing cover 1 and the first end of fill out sand tube 2
Envelope.
In the back-up sand pipe device of the simulation core of the embodiment of the present invention, the second sealing cover 3 includes the second capping and from the
The second cover rim that two capping edges extend to the direction vertical with the second capping direction, it is recessed that the inner wall of the second cover rim offers second
Slot, and the second sealing ring is provided in the second groove, for ensuring the close close of the second sealing cover 3 and the second end of fill out sand tube 2
Envelope.
In the back-up sand pipe device of the simulation core of the embodiment of the present invention, the first capping and the second capping can be circle,
And first capping area be greater than the second capping area.
It should be noted that the internal diameter of the first capping can be 60mm, the internal diameter of the second capping can be 30mm.
In the back-up sand pipe device of the simulation core of the embodiment of the present invention, it is equipped with outside first on the outside of the first end of fill out sand tube 2
Screw thread, the inner wall of the first sealing cover 1 are equipped with the first internal screw thread, and the first internal screw thread is suitable for cooperating with the first external screw thread, for connecting
The first end of fill out sand tube 2 and the first sealing cover 1.
In the back-up sand pipe device of the simulation core of the embodiment of the present invention, it is equipped with outside second on the outside of the second end of fill out sand tube 2
Screw thread, the inner wall of the second sealing cover 3 are equipped with the second internal screw thread, and the second internal screw thread is suitable for cooperating with the second external screw thread, for connecting
The second end of fill out sand tube 2 and the second sealing cover 3.
In the back-up sand pipe device of the simulation core of the embodiment of the present invention, the back-up sand pipe device of the simulation core further includes
One stopple and the second stopple, the first stopple are suitable for blocking first through hole 1-1, and the second stopple is suitable for blocking the second through-hole 3-1, so that
The quartz sand that difference presets mesh number when filling and presenting of fill out sand tube 2 will not be flowed out from first through hole 1-1 or the second through-hole 3-1.
In the back-up sand pipe device of the simulation core of the embodiment of the present invention, the length value range of tubular column main body 2-1 is
250-350mm, preferably 300mm；The value range of the length of pipeline section 2-2 is 25-35mm, preferably 30mm.
The back-up sand pipe device of a kind of simulation core of the embodiment of the present invention, by the tubular column main body 2-1 in fill out sand tube 2
It is provided with and extends outwardly from one end of tubular column main body 2-1 and pipeline section 2-2 that caliber is gradually increased, can be filled and presented in pipeline section 2-2
The quartz sand of multiple default mesh numbers, and multiple quartz sand layers are formed to replace fine and close sieve, expand the flow surface of continuous gel
Product, and then reduce the blocking and shearing in continuous gel injection process to continuous gel, improve the displacement of continuous gel
And plugging effect.
Embodiment two
Method is filled and presented the embodiment of the invention provides a kind of fill out sand tube of simulation core, the fill out sand tube based on simulation core
Device is filled and presented, and can be used under the scene of different zones condition, in the present embodiment mainly with 3rd area Gang Xi and Gangdong
For one area, method flow diagram is as shown in Fig. 2, specific as follows:
Step 101: connecting and seal the first end of the first sealing cover and fill out sand tube.
Specifically, by the first end and the first sealing cover of rotation of the first sealing cover alignment fill out sand tube, meanwhile, the first stopple plug
Into first through hole, it is ensured that the tight seal between the first sealing cover and fill out sand tube guarantees not to be in communication with the outside inside fill out sand tube.
Step 102: the first quartz sand of the first default mesh number being injected into fill out sand tube from the second end of fill out sand tube, is pressed into
First quartz sand layer.
When scene is 3rd area Gang Xi, the first quartz sand of the first default mesh number can be 70 mesh quartz sands, fill and present height
It can be 10mm for the one third of length of pipe section, and be compacted using compacting machine, be pressed into the first quartz sand layer；
When scene is one area of Gangdong, the first quartz sand of the first default mesh number can be 50 mesh quartz sands, fill and present height
It can be 10mm for the one third of length of pipe section, and be compacted using compacting machine, be pressed into the first quartz sand layer.
Step 103: the second quartz sand of the second default mesh number being injected into fill out sand tube from the second end of fill out sand tube, is pressed into
The second quartz sand layer on the first quartz sand layer.
When scene is 3rd area Gang Xi, the second quartz sand of the second default mesh number can be 100 mesh quartz sands, fill and present height
It can be 10mm for the one third of length of pipe section, and be compacted using compacting machine, be pressed into the second quartz sand layer；
When scene is one area of Gangdong, the second quartz sand of the second default mesh number can be 70 mesh quartz sands, fill and present height
It can be 10mm for the one third of length of pipe section, and be compacted using compacting machine, be pressed into the second quartz sand layer.
Step 104: the third quartz sand that third presets mesh number being injected into fill out sand tube from the second end of fill out sand tube, is pressed into
Third quartz sand layer on the second quartz sand layer.
When scene is 3rd area Gang Xi, the second quartz sand that third presets mesh number can be 140 mesh quartz sands, fill and present height
It can be 10mm for the one third of length of pipe section, and be compacted using compacting machine, be pressed into third quartz sand layer；
When scene is one area of Gangdong, the third quartz sand that third presets mesh number can be 100 mesh quartz sands, fill and present height
It can be 10mm for the one third of length of pipe section, and be compacted using compacting machine, be pressed into third quartz sand layer.
At this point, the first quartz sand layer, the second quartz sand layer and third quartz sand layer are located in pipeline section, i.e., by first in pipeline section
Quartz sand layer, the second quartz sand layer and third quartz sand layer fill up, as shown in Figure 2.
Step 105: reservoir sand being injected into fill out sand tube from the second end of fill out sand tube, is pressed on third quartz sand layer
Stratum layer of sand.
In this step, reservoir sand is filled out and is filled in tubular column main body, guarantee point of third quartz sand layer and stratum layer of sand
Interface is located at the boundary of tubular column main body and pipeline section；Meanwhile number is also provided on third quartz sand layer and is increased from bottom to up
Big one or more quartz sands, it will be appreciated by those skilled in the art that be in different embodiments using three or more
Quartz sand layer is also within protection scope of the present invention.
It should be noted that mesh number indicate be material granularity or fineness degree, general definition refers to sieve in 1 square of English
Hole count in very little, mesh number is bigger, illustrates that material size is thinner；Mesh number is smaller, illustrates that material size is bigger, so, first is default
Mesh number is less than the second default mesh number, and the second default mesh number is less than third and presets mesh number, and third presets the mesh that mesh number is less than reservoir sand
Number.
When scene is 3rd area Gang Xi, the reservoir sand in 3rd area Gang Xi is gradually filled and presented into fill out sand tube, and often fill and present 10mm
With regard to being compacted using compacting machine to reservoir sand, until filling up reservoir sand in tubular column main body.
When scene is one area of Gangdong, the reservoir sand in one area of Gangdong is gradually filled and presented into fill out sand tube, and often fill and present 10mm
With regard to being compacted using compacting machine to reservoir sand, until filling up reservoir sand in tubular column main body.
In the actual use process, it after having filled and presented rock core according to above-mentioned steps, connects and seals the second sealing cover and fill out
The second end of sandpipe, the measurement to porosity and permeability is carried out after filling and presenting to simulation core, is ensuring first through hole and second
It in the case where being connected to inside through-hole and fill out sand tube, vacuumized, be saturated water process, respectively obtain the back-up sand in simulation 3rd area Gang Xi
The permeability and porosity of the fill out sand tube rock core of the permeability and porosity and one area of Gangdong of pipe rock core, so that the infiltration in 3rd area Gang Xi
Saturating rate can be 1500mD, and error value range is ± 200mD, and porosity can be 30%, and error value range is ± 3%；
The permeability in one area of Gangdong can be 3500mD, and error value range is ± 200mD, and porosity can be 32%, error value
Range is ± 3%.If the value of the porosity and permeability measured is not in preset error value range, with regard to carrying out again
It fills and presents, until the parameter of porosity and permeability is in the value range of setting.
After determining that rock core meets experimental standard, (molecular weight is 20,000,000 to 0.4% polyacrylamide of configuration, degree of hydrolysis
18%), the continuous gel rubber system 400mL of 0.4% phenolic resin, solution is placed in the intermediate receptacle with piston.
Connection experiment flow simultaneously starts the simulation core that displacement pump has filled and presented the continuous gel injection in intermediate receptacle
In back-up sand pipe device, the continuous gel for passing through fill out sand tube rock core is taken out from the second through hole, until in the complete intermediate receptacle of displacement
Stop experiment after continuous gel.
After stopping experiment, degree is declined by the end face blocking and the shearing of continuous gel of calculating simulation rock core to verify
The reasonability of method is filled and presented, specifically, it is to be taken out respectively by opening rock core after the completion of experiment using existing that end face blocking, which calculates,
The continuous gel for filling and presenting method and the arrival end remnants for filling and presenting method of the invention of technology is simultaneously weighed, with the prior art
Fill and present the continuous gel weight of remnants in method subtract after the continuous gel weight of remnants filled and presented in method of the invention again divided by
The continuous gel weight of remnants of the prior art filled and presented in method；It is by being taken out respectively by the prior art that shearing decline, which calculates,
Fill and present method and the of the invention continuous gel for filling and presenting method shearing and measure the continuous gel after two methods are sheared
Viscosity, with the of the invention continuous gel viscosity value filled and presented after method shearing subtract the prior art fill and present method shearing after
Continuous gel viscosity value fills and presents the continuous gel viscosity value of method divided by of the invention again.
When scene is 3rd area Gang Xi, reduced using the rear end face blocking of the simulation core for filling and presenting method of the invention
90%, 95% is had dropped to the shearing of continuous gel；When scene is Gangdong San Qu, the simulation for filling and presenting method of the invention is used
The blocking of the rear end face of rock core reduces 93%, has dropped 96% to the shearing of continuous gel, illustrates of the invention to fill and present method
Significantly improve displacement and the plugging effect of continuous gel.
The embodiment of the present invention extended outwardly from one end of tubular column main body using being provided in the tubular column main body of fill out sand tube and
The pipeline section that caliber is gradually increased, successively filled and presented in pipeline section the first quartz sand of the first default mesh number, the second default mesh number
Two quartz sands and third preset the third quartz sand of mesh number, form the first quartz sand layer, the second quartz sand layer and third quartz sand
Layer fills and presents reservoir sand in tubular column main body, forms stratum layer of sand, and boundary is formed between stratum layer of sand and third quartz sand layer
Face can use the first quartz sand layer, the second quartz sand layer and third quartz sand layer to be formed and replace fine and close sieve, and interface takes
For back-up sand end surfaces, reduces the blocking and shearing in continuous gel injection process to continuous gel, improve continuous gel
Displacement and plugging effect.
The above is merely for convenience of it will be understood by those skilled in the art that technical solution of the present invention, not to limit
The present invention.All within the spirits and principles of the present invention, any modification, equivalent replacement, improvement and so on should be included in this
Within the protection scope of invention.
Claims (10)
1. a kind of back-up sand pipe device of simulation core, which is characterized in that the back-up sand pipe device of the simulation core includes sealing cover
And fill out sand tube, wherein
The sealing cover includes the first sealing cover and the second sealing cover, and first sealing cover is set in the first of the fill out sand tube
End, second sealing cover are set in the second end of the fill out sand tube；
First sealing cover offers first through hole, for injecting fluid into the fill out sand tube；
Second sealing cover offers the second through-hole, the fluid for being discharged in the fill out sand tube,
The fill out sand tube includes tubular column main body and extends outwardly from one end of the tubular column main body and pipeline section that caliber is gradually increased,
The port of the pipeline section is the first end of the fill out sand tube, and the tubular column main body is suitable for filling and presenting reservoir sand, and the pipeline section is suitable for filling out
System multiple quartz sand layers that mesh number successively increases from the first end.
2. the back-up sand pipe device of simulation core according to claim 1, which is characterized in that first sealing cover includes the
One capping and the first cover rim extended from first capping edge to the direction vertical with first capping direction, described the
The inner wall of one cover rim offers the first groove, and is provided with the first sealing ring in first groove.
3. the back-up sand pipe device of simulation core according to claim 2, which is characterized in that second sealing cover includes the
Two cappings and the second cover rim extended from second capping edge to the direction vertical with second capping direction, described the
The inner wall of two cover rims offers the second groove, and second sealing ring is provided in second groove.
4. the back-up sand pipe device of simulation core according to claim 3, which is characterized in that the area of first capping is big
In the area of second capping.
5. the back-up sand pipe device of simulation core according to claim 1, which is characterized in that outside the first end of the fill out sand tube
Side is equipped with the first external screw thread, and the inner wall of first sealing cover is equipped with the first internal screw thread, first internal screw thread be suitable for it is described
The cooperation of first external screw thread.
6. the back-up sand pipe device of simulation core according to claim 1, which is characterized in that outside the second end of the fill out sand tube
Side is equipped with the second external screw thread, and the inner wall of second sealing cover is equipped with the second internal screw thread, second internal screw thread be suitable for it is described
The cooperation of second external screw thread.
7. the back-up sand pipe device of simulation core according to claim 1, which is characterized in that the length of the tubular column main body takes
Value range is 250-350mm, and the value range of the length of the pipeline section is 25-35mm.
8. a kind of fill out sand tube of simulation core fills and presents method, the fill out sand tube dress of the simulation core based on claim 1-7
It sets, which is characterized in that the method for filling and presenting includes:
Connect and seal the first end of first sealing cover and the fill out sand tube；
First quartz sand of the first default mesh number is injected into the fill out sand tube from the second end of the fill out sand tube, is pressed into first
Quartz sand layer；
Second quartz sand of the second default mesh number is injected into the fill out sand tube from the second end of the fill out sand tube, is pressed into and is located at
The second quartz sand layer on first quartz sand layer；
The third quartz sand that third presets mesh number is injected into the fill out sand tube from the second end of the fill out sand tube, is pressed into and is located at
Third quartz sand layer on second quartz sand layer；
Reservoir sand is injected into the fill out sand tube from the second end of the fill out sand tube, is pressed on the third quartz sand layer
Stratum layer of sand,
Wherein first quartz sand layer, second quartz sand layer and third quartz sand layer are located in the pipeline section；Described
One default mesh number is less than the described second default mesh number, and the second default mesh number is less than the third and presets mesh number, and described the
Three default mesh numbers are less than the mesh number of the reservoir sand.
9. according to claim 8 fill and present method, which is characterized in that the third quartz sand layer and the stratum layer of sand
Interface is located at the boundary of the tubular column main body and the pipeline section.
10. according to claim 8 fill and present method, which is characterized in that be additionally provided with mesh number on the third quartz sand layer
The one or more quartz sand layers increased from bottom to up.
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