CN107620592A - The liquid collector of the full surface saturation of fluid of rock core and full surface saturation process - Google Patents
The liquid collector of the full surface saturation of fluid of rock core and full surface saturation process Download PDFInfo
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- CN107620592A CN107620592A CN201610560513.7A CN201610560513A CN107620592A CN 107620592 A CN107620592 A CN 107620592A CN 201610560513 A CN201610560513 A CN 201610560513A CN 107620592 A CN107620592 A CN 107620592A
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Abstract
Liquid collector and full surface saturation process of the present invention for a kind of full surface saturation of fluid of rock core, the core holding unit of its top bottom opening of fixed seal connection one, rock core is fixed with the inner chamber of core holding unit, liquid collector includes the pressure-bearing joint being fixedly connected with the sealed bottom of core holding unit, constant pressure liquid cylinder is sealedly connected with below pressure-bearing joint, sealing is equipped with piston type joint in pressure-bearing joint, the bottom opening of core holding unit is stretched at the top of piston type joint, and it is sealedly attached in its inner chamber, the bottom of piston type joint is extended in the inner chamber of constant pressure liquid cylinder；Central passage is provided with piston type joint, is slided in central passage and is provided with piston；Saturated oils passage is provided with the side wall of constant pressure liquid cylinder, its bottom is provided with the leakage fluid dram that can be closed.The liquid collector of the full surface saturation of fluid of the rock core and full surface saturation process can be such that the full surface of rock core is contacted with water/oil, percolation flow velocity is fast, realize the volume of accurate metering saturation water and saturated oils.
Description
Technical field
The present invention relates to oil field development technical field, more particularly to a kind of rock core for being applied to special low ultra-low penetration rock core
The liquid collector of the full surface saturation of fluid and full surface saturation process.
Background technology
Most domestic oil reservoir is formed under hydrodynamics environment, therefore, the of laboratory simulation oil reservoir development
One step is exactly to simulate the formation of oil reservoir.Common practice is the first saturation stratum water into rock core, then the saturation crude oil into rock core, from
And form the simulation oil reservoir of rock core yardstick.The professional standard (SY-T6169-1995) of classification of reserves determines low-permeability oil deposit
Permeability be 10~50mD, the permeability of extra-low permeability oil reservoirs is<10mD be (Li Daopin's《LOW PERMEABILITY OILFIELD DEVELOPMENT》In one book
The permeability for further illustrating 0.1~1mD is extra-low-permeability reservoir).
The method of rock core saturation water/oil is broadly divided into two kinds at present, and a kind of is the most frequently used method, i.e., by clamper
Rubber tube clamps rock core side, injection production pressure difference is established using two end faces of rock core, so as to realize the saturation of fluid；
Another kind is to consider the infusion method saturation water compared with flow in low permeability core feature, and the rock core that will be dried is inserted water-filled
Saturation water is carried out in high-pressure bottle, is quickly put into again in core holding unit according to first method saturated oils after saturation.Its
Mainly comprise the following steps：1. being cleaned and being dried the special low Oil in Super-low Permeability rock core for treating saturation by relevant criterion, claim its heavy with high accuracy balance
Measure as M1；2. the rock core of drying is put into appropriately sized high-pressure bottle, integrally vacuumize 4 hours；3. into high-pressure bottle
Full of water is wanted, rise pressure to 10MPa is simultaneously kept for 4 hours；4. slowly it is depressurized to removal of core after normal pressure and quickly removes surface
Water stain, its weight is referred to as M2, and the difference with M1 is the quality into rock core hole reclaimed water；Clamped 5. rapidly loading rock core
Device, and carry out saturated oils according to first method.
However, for special low ultra-low penetration rock core, fluid ability of the water/oil inside it is very limited, uses conventional method
Saturation is faced with four aspect problems：First, the pressure difference of conventional size can not make water/oil smoothly enter rock core hole, saturation is caused to lose
Lose；Second, carrying out saturation even with High Pressure Difference, the percolation flow velocity that water/oil enters rock core is also minimum so that saturation time is long,
Often need the time of even more than ten days several days；Third, the degree of saturation of rock core is insufficient, fluid cannot be introduced into minimum in rock core
Hole, thus the oil water relation of oil reservoir can not be reflected；Fourth, the rock core after invading bubble method saturation water is used to need ability after release
Weigh and determine saturated water amount and continue saturated oils, this process will certainly cause have oozing out for part water in rock core hole, cause
Saturation water error in dipping and saturation are insufficient.
The main reason for producing above mentioned problem is that conventional method rock core in saturation history only has an end face and connect with water/oil
Touch, contact area is too small.If saturation object is the preferable rock core of permeability, effective displacement is easily formed, completes the full of water/oil
With.If saturation object is special low ultra-low penetration rock core, it is difficult to form effective displacement, it is impossible to make water/oil smoothly be saturated to rock core
In hole.If the contact area of water/oil and rock core can be expanded, then will greatly improve the water of special low Oil in Super-low Permeability rock core/
Oily saturation effect and reduction saturation difficulty.
Thus, the present inventor relies on experience and the practice for being engaged in relevant industries for many years, proposes a kind of full table of the fluid of rock core
The liquid collector of face saturation and full surface saturation process, the defects of to overcome prior art.
The content of the invention
It is an object of the invention to provide a kind of liquid collector of the full surface saturation of fluid of rock core and full surface saturation side
Method, overcome present in prior art the problems such as contact area is small, percolation flow velocity is slow, error in dipping is big, the full table of rock core can be made
Face contacts with water/oil, percolation flow velocity is fast, and liquid collector can realize the volume of accurate metering saturation water and saturated oils.
The object of the present invention is achieved like this, a kind of liquid collector of the full surface saturation of the fluid of rock core, the rock core
The full surface saturation of fluid liquid collector the bottom opening of top fixed seal connection one core holding unit, rock core folder
Rock core is fixed with the inner chamber of holder, being provided between the rock core and the intracavity sidewall of the core holding unit can radial expansion
Cartridge, between the inwall of the cartridge and the side wall of the rock core formed rock core annular space, the core holding unit
On be provided with the saturation aquaporin connected with saturation water pump and the confined pressure passage connected with confined pressure pump, the liquid collector include with
The pressure-bearing joint that the sealed bottom of the core holding unit is fixedly connected, a top is sealedly connected with below the pressure-bearing joint
The constant pressure liquid cylinder of open bottom closing, fixation is sealed in the pressure-bearing joint and is equipped with a piston type joint, the piston type
The bottom opening of core holding unit is stretched at the top of joint and is sealedly attached in the inner chamber of the core holding unit, the work
The bottom of plug joint is extended in the inner chamber of the constant pressure liquid cylinder；Open top bottom is provided with the piston type joint
Closing and the central passage that can connect with the rock core annular space and the constant pressure liquid cylinder, setting is slided in the central passage
There is the piston of energy closed top end opening；Be provided with the side wall of the constant pressure liquid cylinder connect the constant pressure liquid cylinder inner chamber and
The saturated oils passage of saturation oil pump, the bottom of the constant pressure liquid cylinder are provided with the leakage fluid dram that can be closed.
In the better embodiment of the present invention, the piston type joint includes joint body, the joint body
The central passage is set at axial centre, and the outer wall top of the joint body is fixedly installed pressure-bearing ring flat-plate, the pressure-bearing
The bottom surface of the top surface of ring flat-plate and the core holding unit leans, and the bottom surface of the pressure-bearing ring flat-plate is resisted against the pressure-bearing joint
Plate upper surface, open top is provided with the side wall of the joint body and bottom with outside the side wall of the joint body
First displacement passage of insertion, the first displacement passage connect with the displacement control device outside liquid collector, the center
The bottom insertion of passage is provided with first piston control liquid passage, and the first piston is controlled outside liquid passage and liquid collector
Piston pump connects.
In the better embodiment of the present invention, the side wall upper part of the joint body is provided with the connection rock core ring
First flow-guiding mouth of empty and described central passage, the lower sidewall of the joint body be provided with the connection constant pressure liquid cylinder and
Second flow-guiding mouth of the central passage.
In the better embodiment of the present invention, the inwall of the pressure-bearing joint top end opening and the pressure-bearing joint
It is tightly connected with the outer wall of the core holding unit, lower connecting cylinder, the lower company is provided with below the bottom plate of the pressure-bearing joint
The outer wall upper sleeve gasket of the outer wall of connect cylinder and the constant pressure liquid cylinder is connected to outer connecting cylinder.
In the better embodiment of the present invention, the top of the constant pressure liquid cylinder is provided with first step portion, described
The upper seal in first step portion is arranged in the inside of the lower connecting cylinder, and the bottom surface of the lower connecting cylinder is resisted against described first
In stage portion, the outer connecting cylinder is socketed on the lower section that the constant pressure liquid cylinder is located at the first step portion.
In the better embodiment of the present invention, joint connecting hole is provided with the bottom plate of the pressure-bearing joint, it is described
The top of joint connecting hole is provided with the downward tapered taper hole of diameter, and the joint connecting hole also includes below the taper hole
Threaded connection section.
In the better embodiment of the present invention, the mistake matched with the taper hole is provided with below the pressure-bearing ring flat-plate
Cone section is crossed, is provided with the first sealing ring between the transition cone section and the taper hole, the joint body is located at the pressure-bearing and connect
The bottom plate lower position of head is sealedly connected with pressure strip, and the top surface of the pressure strip is resisted against the bottom plate following table of the pressure-bearing joint
Face.
In the better embodiment of the present invention, it is tapered downwards that the intracavity bottom of the constant pressure liquid cylinder is provided with diameter
The buffering transition conical surface；The second displacement passage is provided with the side wall of the constant pressure liquid cylinder, the second displacement passage passes through
Pipeline connects with the first displacement passage, and the second displacement passage connects with the displacement control device；The constant pressure collection
It is additionally provided with second piston control liquid passage in the side wall of fluid cylinder, second piston control liquid passage passes through pipeline and described the
The control liquid passage connection of one piston, the second piston control liquid passage connect with the piston pump.
In the better embodiment of the present invention, the liquid collector and the rock of the full surface saturation of fluid of the rock core
Heart clamp holder may be contained within insulating box.
The purpose of the present invention can also be achieved in that, utilize the liquid collector of the full surface saturation of the fluid of foregoing rock core
Full surface saturation process, comprises the following steps：
Step a：The liquid collector of the full surface saturation of the fluid of rock core is assembled, during leakage fluid dram is closed and piston is located at
The bottom of heart passage, the liquid collector connection of the full surface saturation of the fluid of core holding unit, rock core is placed in structure in insulating box
Into experimental system, experimental system is connected respectively with saturation water pump, confined pressure pump, saturation oil pump, the displacement control device of outside, will
Rock core is arranged in core holding unit, experimental system is vacuumized 10 hours, it is ensured that the vacuum environment of experimental system；
Step b：Saturation water pump and confined pressure pump are opened simultaneously, are slowly clamped respectively to rock core annular space, cartridge and rock core
Pressurizeed in annular space between device inwall and inject distilled water, the ring between rock core annular space, cartridge and core holding unit inwall
After aerial pressure reaches 10MPa, pressure constant state is kept more than 4 hours；
Step c：Slowly pressure to 11MPa, makes sealing in the annular space between rise cartridge and core holding unit inwall
Packing element radial contraction and rock core close contact, the water of rock core annular space are expelled in constant pressure liquid cylinder, open leakage fluid dram by constant pressure collection
Water in fluid cylinder is expelled in graduated cylinder, measure respectively rock core annular space injection water volume and constant pressure liquid cylinder in discharge the body of water
Product, the difference between the two are the water volume being saturated in rock core space, and rock pore volume；
Step d：Leakage fluid dram is closed, and constant pressure liquid cylinder is vacuumized 1 hour, saturation oil pump is opened, is led to by saturated oils
Road slowly injects saturation oil into constant pressure liquid cylinder, while reduces confined pressure pump pressure, reaches whole experimental system pressure
10MPa, constant-pressure stable more than 4 hours；
Step e：During constant-pressure stable, saturation oil enters rock core bottom and rock core annular space, rock core hole through central passage
Water in gap is saturated to be cemented out with oil, and water is flowed into constant pressure liquid cylinder along rock core annular space through central passage, and is collected in
The bottom of constant pressure liquid cylinder；
Step f：Saturation oil pump is closed, slowly opens leakage fluid dram, leakage fluid dram is opened and is expelled to the water in constant pressure liquid cylinder
In graduated cylinder, the volume of metering discharge water, while in the annular space between cartridge and core holding unit inwall under pressure effect,
Cartridge radial contraction and rock core close contact, it is ensured that confined pressure is in 3~5MPa；
Step g：Piston pump is opened, controls liquid passage, first piston to control liquid passage to piston base by second piston
Injection oil, piston is pushed into the top of central passage, blocks the fluid communication of rock core and central passage；Pass through displacement control device
Carry out follow-up rock core displacement test.
From the above mentioned, the liquid collector of the full surface saturation of the fluid of rock core provided by the invention and full surface saturation process,
So that the full surface of rock core contacts with water/oil, seepage area is expanded, the seepage flow flux of water/oil is added, so as to effectively improve
Saturation efficiency；The liquid collector of the full surface saturation of fluid of rock core provided by the invention and full surface saturation process, Neng Goushi
Accurate measurement now is carried out to water/oil of saturated core hole；The liquid collecting dress of the full surface saturation of fluid of rock core provided by the invention
Put and full surface saturation process, can realize that permeability is less than water/oily saturation of 0.1mD rock cores, it is special low ultralow in gas injection development
The desk research field of infiltration oil reservoir has broad application prospects.
Brief description of the drawings
The following drawings is only intended to, in doing schematic illustration and explanation to the present invention, not delimit the scope of the invention.Wherein：
Fig. 1：For the structural representation of the experimental system of the full surface saturation water/oil of rock core of the present invention.
Fig. 2：For the structural representation of the liquid collector of the full surface saturation of fluid of the rock core of the present invention.
Fig. 3：For the structural representation of the pressure-bearing joint of the present invention.
Fig. 4：For the structural representation of the piston type joint of the present invention.
Fig. 5：For the structural representation of the constant pressure liquid cylinder of the present invention.
In figure：
100th, the liquid collector of the full surface saturation of the fluid of rock core；
1st, pressure-bearing joint；
11st, bottom plate；
12nd, lower connecting cylinder；
13rd, joint connecting hole；131st, taper hole；
2nd, piston type joint；
20th, joint body；201st, the first displacement passage；202nd, first piston control liquid passage；203rd, the first flow-guiding mouth；
204th, the second flow-guiding mouth；
21st, central passage；22nd, piston；23rd, pressure-bearing ring flat-plate；24th, transition cone section；25th, pressure strip；
3rd, constant pressure liquid cylinder；31st, saturated oils passage；32nd, leakage fluid dram；33rd, first step portion；34th, the transition conical surface is buffered；
35th, the second displacement passage；36th, second piston control liquid passage；
4th, outer connecting cylinder；
51st, the first sealing ring；510th, o-ring groove；52nd, the second sealing ring；53rd, the 3rd sealing ring；
7th, insulating box；
8th, rock core；
9th, core holding unit；91st, cartridge；92nd, saturation water pump；93rd, confined pressure pump；94th, saturation oil pump；95th, displacement control
Device processed；951st, displacement pump；952nd, back-pressure valve；953rd, gas-liquid metering device；96th, piston pump.
Embodiment
In order to which technical characteristic, purpose and the effect of the present invention is more clearly understood, now control illustrates this hair
Bright embodiment.
As shown in Figure 1 and Figure 2, the liquid collector 100 of the full surface saturation of the fluid of a kind of rock core provided by the invention, rock core
The full surface saturation of fluid liquid collector 100 the bottom opening of top fixed seal connection one core holding unit 9, rock core folder
Rock core 8 is fixed with the inner chamber of holder 9, the close of energy radial expansion is provided between rock core 8 and the intracavity sidewall of core holding unit 9
Sealing cylinder 91, rock core annular space is formed between the inwall of cartridge 91 and the side wall of rock core 8, saturation history reclaimed water or oil pass through
Simultaneously saturation enters in rock core 8 for the side of rock core annular space disengaging rock core 8；It is provided with core holding unit 9 and is connected with saturation water pump 92
Saturation aquaporin and the confined pressure passage that is connected with confined pressure pump 93, liquid collector 100 include the sealed bottom with core holding unit 9
The pressure-bearing joint 1 being fixedly connected, in the present embodiment, pressure-bearing joint 1 is threadingly attached to the bottom of core holding unit 9；
The lower section of pressure-bearing joint 1 is sealedly connected with the constant pressure liquid cylinder 3 of an open top bottom lock, seals and fixes in pressure-bearing joint 1
A piston type joint 2 is equipped with, the top of piston type joint 2 stretches into the bottom opening of core holding unit 9 and is sealedly attached to rock
In the inner chamber of heart clamp holder 9, the bottom of piston type joint 2 is extended in the inner chamber of constant pressure liquid cylinder 3；Set on piston type joint 2
Open top bottom end closure and the central passage 21 that can be connected with rock core annular space and constant pressure liquid cylinder 3 are equipped with, central passage 21
The bottom of top and rock core 8 is against in saturation history, water or oil can pass through the bottom end face that central passage 21 enters rock core 8；
The piston 22 for being provided with energy closed top end opening, in the present embodiment, piston 22 and central passage are slided in central passage 21
The 3rd sealing ring 53 is provided between 21 side wall, the quantity of the 3rd sealing ring 53 is 2；Set in the side wall of constant pressure liquid cylinder 3
The inner chamber of connection constant pressure liquid cylinder 3 and the saturated oils passage 31 of saturation oil pump 94 are equipped with, the bottom of constant pressure liquid cylinder 3 is provided with energy
The leakage fluid dram 32 of closing.The effect of constant pressure liquid cylinder 3 mainly has at 2 points, is had more first, being collected during the saturation water of rock core 8
Injection water, and bear saturation pressure, be that the water oozed out in the hole of rock core 8 is collected during the saturated oils of rock core 8 in addition, and hold
By saturation pressure, the oily volume and the volume phase of the water oozed out in the hole of rock core 8 that saturation enters in the hole of rock core 8 in theory
Deng.
Pressure-bearing joint 1, piston type joint 2 form the liquid collecting of the full surface saturation of fluid of rock core with the assembling of constant pressure liquid cylinder 3
Device 100, pressure-bearing joint 1, piston type joint 2 realize that core holding unit 9 and the sealing of constant pressure liquid cylinder 3 connect, in this implementation
In mode, the liquid collector and core holding unit of the full surface saturation of fluid of rock core may be contained within insulating box 7, form sealing
Rock core saturation experimental system, realize that rock core 8 and the full surface of saturation water, saturated oils contact, expand seepage area, add
The seepage flow flux of water/oil, so as to be effectively improved saturation efficiency.
Further, as shown in Figure 1, Figure 2, Figure 4 shows, piston type joint 2 includes joint body 20, in the axial direction of joint body 20
Central passage 21 is set at the heart, and the outer wall top of joint body 20 is fixedly installed pressure-bearing ring flat-plate 23, the top surface of pressure-bearing ring flat-plate 23
Leant with the bottom surface of core holding unit 9, the bottom surface of pressure-bearing ring flat-plate 23 is resisted against the upper surface of bottom plate 11 of pressure-bearing joint 1, joint
The first displacement passage that open top is provided with the side wall of body 20 and is penetrated outside the side wall of bottom and joint body 20
201, the first displacement passage 201 connects with the displacement control device 95 outside liquid collector 100, the bottom insertion of central passage 21
It is provided with first piston control liquid passage 202, first piston control liquid passage 202 and the piston pump 96 outside liquid collector 100
Connection.The thickness and diameter of each position of piston type joint 2 are determined by testing resistance to pressure request.
Further, as shown in Figure 2, Figure 4 shows, the side wall upper part of joint body 20 is provided with connection rock core annular space and central passage
21 the first flow-guiding mouth 203, the lower sidewall of joint body 20 are provided with the second of connection constant pressure liquid cylinder 3 and central passage 21
Flow-guiding mouth 204.Central passage 21 is the flow channel of the saturation water process reclaimed water of rock core 8, central passage 21 and the saturated oils of rock core 8
During saturation lead to the passage of rock core 8 with oil, while be that rock core pore water flows out to constant pressure collection during the saturated oils of rock core 8
The sliding channel of the passage of fluid cylinder 3, central passage 21 or piston 22.First flow-guiding mouth 203, the second flow-guiding mouth 204 are used to satisfy
With the water conservancy diversion of process reclaimed water and oil in rock core annular space and constant pressure liquid cylinder 3.The saturation water of rock core 8 or it is oily when, piston 22 is in
The bottom of central passage 21, it is ensured that the first flow-guiding mouth 203, the second flow-guiding mouth 204 turn on central passage 21, the saturation knot of rock core 8
Shu Hou, piston are moved to the top of central passage 21 from the bottom of central passage 21, block central passage 21 and the company of rock core 8
It is logical.
Further, as shown in Figure 2 and Figure 3, the inwall of the top end opening of pressure-bearing joint 1 and pressure-bearing joint 1 and core holding unit 9
Outer wall be tightly connected, in the present embodiment, the two is connected by thread seal；The lower section of bottom plate 11 of pressure-bearing joint 1 is set
There is lower connecting cylinder 12, the outer wall of lower connecting cylinder 12 is connected to outer connecting cylinder 4 with the outer wall upper sleeve gasket of constant pressure liquid cylinder 3, in this reality
Apply in mode, the outer wall of lower connecting cylinder 12 is with being provided with the connection being connected with the outer inwall of connecting cylinder 4 on the outer wall of constant pressure liquid cylinder 3
Screw thread.The thickness and diameter of each position of pressure-bearing joint 1 are determined by testing resistance to pressure request.
Further, as shown in Fig. 2 the top of constant pressure liquid cylinder 3 is provided with first step portion 33, first step portion 33 it is upper
Side's sealing is arranged in the inside of lower connecting cylinder 12, in order to reach sealing effectiveness, the top in first step portion 33 and lower connecting cylinder 12
Inwall between be provided with the second sealing ring 52, the quantity of the second sealing ring 52 is 2；The bottom surface of lower connecting cylinder 12 is resisted against
In one stage portion 33, outer connecting cylinder 4 is socketed on the lower section that constant pressure liquid cylinder 3 is located at first step portion 33.
Further, as shown in Figure 2 and Figure 3, joint connecting hole 13, joint connecting hole are provided with the bottom plate 11 of pressure-bearing joint 1
13 top is provided with the downward tapered taper hole 131 of diameter.
Further, as shown in Figure 2 and Figure 3, the lower section of pressure-bearing ring flat-plate 23 is provided with the transition cone section 24 matched with taper hole 131,
Transition is bored and is provided with the first sealing ring 51 between section 24 and taper hole 131, in the present embodiment, transition cone section 24 and taper hole 131
Side wall on be provided with installation the first sealing ring 51 o-ring groove 510.Joint body 20 is located at the bottom plate 11 of pressure-bearing joint 1
Lower position is sealedly connected with pressure strip 25, and the top surface of pressure strip 25 is resisted against the lower surface of bottom plate 11 of pressure-bearing joint 1, pressure strip
25 are fastened on piston type joint 2 on pressure-bearing joint 1, and in the present embodiment, the bottom of joint body 20 is provided with for spiral shell
Line connects the thread segment of pressure strip 25.
Further, as shown in Fig. 2, Fig. 5, it is tapered buffered downwards that the intracavity bottom of constant pressure liquid cylinder 3 is provided with diameter
Cross the conical surface 34；In the presence of gravity split-phase, the water oozed out in the hole of rock core 8 is gathered at bottom leakage fluid dram 32, to realize
Accurate measurement.The second displacement passage 35 is provided with the side wall of constant pressure liquid cylinder 3, the second displacement passage 35 passes through pipeline and first
Displacement passage 201 connects, and the second displacement passage 35 connects with displacement control device 95；Also set up in the side wall of constant pressure liquid cylinder 3
There is second piston control liquid passage 36, second piston control liquid passage 36 controls liquid passage 202 to connect by pipeline and first piston
Logical, second piston control liquid passage 36 connects with piston pump 96.The thickness and diameter of each position of constant pressure liquid cylinder 3 are pressure-resistant by testing
It is required that determine.
Using the full surface saturation process of the liquid collector 100 of the full surface saturation of the fluid of rock core, comprise the following steps：
Step a：The liquid collector 100 of the full surface saturation of the fluid of rock core is assembled, leakage fluid dram 32 is closed and piston
22 are located at the bottom of central passage 21, and the liquid collector 100 of the full surface saturation of the fluid of core holding unit 9, rock core is connected simultaneously
It is placed in insulating box 7 and forms experimental system, by experimental system and outside saturation water pump 92, confined pressure pump 93, saturation oil pump 94, drive
Connected respectively for control device 95, rock core 8 is arranged in core holding unit 9, experimental system is vacuumized 10 hours, it is ensured that be real
The vacuum environment of check system；
Step b：Saturation water pump 92 and confined pressure pump 93 are opened simultaneously, respectively slowly to rock core annular space, cartridge 91 and rock
Pressurizeed in annular space between the inwall of heart clamp holder 9 and inject distilled water, rock core annular space, cartridge 91 with core holding unit 9
After pressure reaches 10MPa in annular space between wall, pressure constant state is kept more than 4 hours；
Step c：Slowly pressure to 11MPa, makes close in the annular space between rise cartridge 91 and the inwall of core holding unit 9
The radial contraction of sealing cylinder 91 and the close contact of rock core 8, the water of rock core annular space are expelled in constant pressure liquid cylinder 3, open leakage fluid dram 32
Water in constant pressure liquid cylinder 3 is expelled in graduated cylinder, arranged respectively in the volume of metering rock core annular space injection water and constant pressure liquid cylinder
The volume of water outlet, the difference between the two are the water volume being saturated in rock core space, and rock pore volume；
Step d：Close leakage fluid dram 32, and constant pressure liquid cylinder 3 is vacuumized 1 hour (now saturation water pump 92 be in close
State, central passage 21 are evacuated simultaneously), saturation oil pump 94 is opened, by saturated oils passage 31 slowly to constant pressure liquid cylinder 3
Middle injection saturation oil, while the pressure of confined pressure pump 93 is reduced, whole experimental system pressure is reached 10MPa, constant-pressure stable 4 hours
More than；
Step e：During constant-pressure stable, saturation oil enters the bottom of rock core 8 and rock core annular space, rock core through central passage 21
Water in 8 holes is saturated to be cemented out with oil, and due to water and the gravity phase separation of oil, water is led along rock core annular space through first
Head piece 203, central passage 21, the second flow-guiding mouth 204 are flowed into constant pressure liquid cylinder 3, and the water of the bottom of rock core 8 pushes up through central passage 21
Portion's opening, central passage 21, the second flow-guiding mouth 204 flow into constant pressure liquid cylinder 3, and collect in the bottom of constant pressure liquid cylinder 3；
Step f：Saturation oil pump 94 is closed, slowly opens leakage fluid dram 32, opens leakage fluid dram 32 by the water in constant pressure liquid cylinder 3
It is expelled in graduated cylinder, the volume of metering discharge water, while is pressed in the annular space between cartridge 91 and the inwall of core holding unit 9
Under power effect, the radial contraction of cartridge 91 and rock core close contact, it is ensured that confined pressure is in 3~5MPa；
Step g：Piston pump 96 is opened, controls liquid passage 36, first piston to control liquid passage 202 to work by second piston
22 bottoms injection oil is filled in, piston 22 is pushed into the top of central passage 21, (during piston 22 is up, micro oil is led through first
Head piece 203, the second flow-guiding mouth 204 outflow central passage 21, because the first flow-guiding mouth 203, the aperture of the second flow-guiding mouth 204 are smaller, no
The oil thrust up to piston 22 can be influenceed) block rock core 8 and the fluid communication of central passage 21；Pass through displacement control device 95
(prior art, including displacement pump 951, back-pressure valve 952, gas-liquid metering device 953 etc.) carries out follow-up rock core displacement test.
From the above mentioned, the liquid collector of the full surface saturation of the fluid of rock core provided by the invention and full surface saturation process,
So that the full surface of rock core contacts with water/oil, seepage area is expanded, the seepage flow flux of water/oil is added, so as to effectively improve
Saturation efficiency；The liquid collector of the full surface saturation of fluid of rock core provided by the invention and full surface saturation process, Neng Goushi
Accurate measurement now is carried out to water/oil of saturated core hole；The liquid collecting dress of the full surface saturation of fluid of rock core provided by the invention
Put and full surface saturation process, can realize that permeability is less than water/oily saturation of 0.1mD rock cores, it is special low ultralow in gas injection development
The desk research field of infiltration oil reservoir has broad application prospects.
The schematical embodiment of the present invention is the foregoing is only, is not limited to the scope of the present invention.It is any
Those skilled in the art, made equivalent variations and modification on the premise of the design of the present invention and principle is not departed from,
The scope of protection of the invention should be belonged to.
Claims (10)
1. a kind of liquid collector of the full surface saturation of the fluid of rock core, the liquid collector of the full surface saturation of fluid of the rock core
The core holding unit of the bottom opening of top fixed seal connection one, rock core is fixed with the inner chamber of the core holding unit, it is described
Be provided between the intracavity sidewall of rock core and the core holding unit can radial expansion cartridge, the cartridge it is interior
Rock core annular space is formed between the side wall of wall and the rock core, the saturation connected with saturation water pump is provided with the core holding unit
Aquaporin and the confined pressure passage connected with confined pressure pump, it is characterised in that：The liquid collector includes and the core holding unit
The pressure-bearing joint that sealed bottom is fixedly connected, the perseverance of an open top bottom lock is sealedly connected with below the pressure-bearing joint
Liquid cylinder is pressed, sealing fixation in the pressure-bearing joint is equipped with a piston type joint, and rock is stretched at the top of the piston type joint
The bottom opening of heart clamp holder and it is sealedly attached in the inner chamber of the core holding unit, the bottom of the piston type joint is prolonged
In the inner chamber for extending the constant pressure liquid cylinder；Be provided with the piston type joint open top bottom end closure and can with it is described
The central passage that rock core annular space connects with the constant pressure liquid cylinder, slides that be provided with can closed top end opening in the central passage
Piston；It is provided with the side wall of the constant pressure liquid cylinder and connects the inner chamber of the constant pressure liquid cylinder and the saturated oils of saturation oil pump
Passage, the bottom of the constant pressure liquid cylinder are provided with the leakage fluid dram that can be closed.
2. the liquid collector of the full surface saturation of the fluid of rock core as claimed in claim 1, it is characterised in that：The piston type connects
Head includes joint body, the setting central passage at the axial centre of the joint body, on the outer wall of the joint body
Portion is fixedly installed pressure-bearing ring flat-plate, and the bottom surface of the top surface of the pressure-bearing ring flat-plate and the core holding unit leans, the pressure-bearing
The bottom surface of ring flat-plate is resisted against the plate upper surface of the pressure-bearing joint, be provided with the side wall of the joint body open top,
And outside the side wall of bottom and the joint body insertion the first displacement passage, the first displacement passage with outside liquid collector
The displacement control device connection in portion, the bottom of the central passage, which penetrates, is provided with first piston control liquid passage, and described first
Piston control liquid passage connects with the piston pump outside liquid collector.
3. the liquid collector of the full surface saturation of the fluid of rock core as claimed in claim 2, it is characterised in that：The joint body
Side wall upper part be provided with the first flow-guiding mouth for connecting the rock core annular space and the central passage, the side wall of the joint body
Bottom is provided with the second flow-guiding mouth for connecting the constant pressure liquid cylinder and the central passage.
4. the liquid collector of the full surface saturation of the fluid of rock core as claimed in claim 2, it is characterised in that：The pressure-bearing joint
The outer wall of the inwall of top end opening and the pressure-bearing joint and the core holding unit is tightly connected, the bottom of the pressure-bearing joint
Lower connecting cylinder is provided with below plate, the outer wall upper sleeve gasket of the outer wall of the lower connecting cylinder and the constant pressure liquid cylinder is connected to outer company
Connect cylinder.
5. the liquid collector of the full surface saturation of the fluid of rock core as claimed in claim 4, it is characterised in that：The constant pressure liquid collecting
The top of cylinder is provided with first step portion, and the upper seal in the first step portion is arranged in the inside of the lower connecting cylinder, institute
The bottom surface for stating lower connecting cylinder is resisted against in the first step portion, and the outer connecting cylinder is socketed on the constant pressure liquid cylinder and is located at institute
State the lower section in first step portion.
6. the liquid collector of the full surface saturation of the fluid of rock core as claimed in claim 4, it is characterised in that：The pressure-bearing joint
Bottom plate on be provided with joint connecting hole, the top of the joint connecting hole is provided with diameter tapered taper hole downwards, described to connect
Head connecting hole also includes the threaded connection section below the taper hole.
7. the liquid collector of the full surface saturation of the fluid of rock core as claimed in claim 6, it is characterised in that：The pressure-bearing ring flat-plate
Lower section be provided with the transition cone section matched with the taper hole, be provided with the first sealing between transition cone section and the taper hole
Circle, the bottom plate lower position that the joint body is located at the pressure-bearing joint are sealedly connected with pressure strip, the top of the pressure strip
Face is resisted against the bottom plate lower surface of the pressure-bearing joint.
8. the liquid collector of the full surface saturation of the fluid of rock core as claimed in claim 2, it is characterised in that：The constant pressure liquid collecting
The intracavity bottom of cylinder is provided with the downward tapered buffering transition conical surface of diameter；Second is provided with the side wall of the constant pressure liquid cylinder
Displacement passage, the second displacement passage are connected by pipeline with the first displacement passage, the second displacement passage and institute
State the connection of displacement control device；Be additionally provided with the side wall of the constant pressure liquid cylinder second piston control liquid passage, described second
Piston controls liquid passage to control liquid passage to connect with the first piston by pipeline, the second piston control liquid passage and institute
State piston pump connection.
9. the liquid collector of the full surface saturation of the fluid of rock core as claimed in claim 1, it is characterised in that：The stream of the rock core
The liquid collector and the core holding unit of the full surface saturation of body may be contained within insulating box.
10. the full surface using the liquid collector of the full surface saturation of fluid of the rock core as described in claim any one of 1-9 is satisfied
And method, comprise the following steps：
Step a：The liquid collector of the full surface saturation of the fluid of rock core is assembled, leakage fluid dram is closed and piston leads to positioned at center
The bottom in road, the liquid collector connection of the full surface saturation of the fluid of core holding unit, rock core is placed in forming in fact in insulating box
Check system, experimental system is connected respectively with saturation water pump, confined pressure pump, saturation oil pump, the displacement control device of outside, by rock core
In core holding unit, experimental system is vacuumized 10 hours, it is ensured that the vacuum environment of experimental system；
Step b：Saturation water pump and confined pressure pump are opened simultaneously, respectively slowly into rock core annular space, cartridge and core holding unit
Pressurizeed in annular space between wall and inject distilled water, in the annular space between rock core annular space, cartridge and core holding unit inwall
After pressure reaches 10MPa, pressure constant state is kept more than 4 hours；
Step c：Slowly pressure to 11MPa, makes cartridge in the annular space between rise cartridge and core holding unit inwall
Radial contraction and rock core close contact, the water of rock core annular space are expelled in constant pressure liquid cylinder, open leakage fluid dram by constant pressure liquid cylinder
In water be expelled in graduated cylinder, measure respectively rock core annular space injection water volume and constant pressure liquid cylinder in discharge the volume of water, two
The difference of person is the water volume being saturated in rock core space, and rock pore volume；
Step d：Leakage fluid dram is closed, and constant pressure liquid cylinder is vacuumized 1 hour, saturation oil pump is opened, is delayed by saturated oils passage
Slowly saturation oil is injected into constant pressure liquid cylinder, while reduces confined pressure pump pressure, whole experimental system pressure is reached 10MPa,
Constant-pressure stable more than 4 hours；
Step e：During constant-pressure stable, saturation oil enters rock core bottom and rock core annular space through central passage, in rock core hole
Water be saturated and cemented out with oil, water is flowed into constant pressure liquid cylinder along rock core annular space through central passage, and collects in constant pressure
The bottom of liquid cylinder；
Step f：Saturation oil pump is closed, slowly opens leakage fluid dram, leakage fluid dram is opened and the water in constant pressure liquid cylinder is expelled to graduated cylinder
In, the volume of metering discharge water, while in the annular space between cartridge and core holding unit inwall under pressure effect, sealing
Packing element radial contraction and rock core close contact, it is ensured that confined pressure is in 3~5MPa；
Step g：Piston pump is opened, controls liquid passage, first piston to control liquid passage to be injected to piston base by second piston
Oil, piston is pushed into the top of central passage, blocks the fluid communication of rock core and central passage；Carried out by displacement control device
Follow-up rock core displacement test.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610560513.7A CN107620592B (en) | 2016-07-15 | 2016-07-15 | Liquid collecting device for full-surface fluid saturation of rock core and full-surface saturation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610560513.7A CN107620592B (en) | 2016-07-15 | 2016-07-15 | Liquid collecting device for full-surface fluid saturation of rock core and full-surface saturation method |
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| CN107620592B CN107620592B (en) | 2020-04-10 |
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