CN116480332A - Oil reservoir pressure-tightness-mining integrated pressure-flooding experimental device and testing method - Google Patents
Oil reservoir pressure-tightness-mining integrated pressure-flooding experimental device and testing method Download PDFInfo
- Publication number
- CN116480332A CN116480332A CN202310552200.7A CN202310552200A CN116480332A CN 116480332 A CN116480332 A CN 116480332A CN 202310552200 A CN202310552200 A CN 202310552200A CN 116480332 A CN116480332 A CN 116480332A
- Authority
- CN
- China
- Prior art keywords
- pressure
- core
- displacement
- oil
- experimental
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000012360 testing method Methods 0.000 title claims abstract description 35
- 238000005065 mining Methods 0.000 title claims abstract description 27
- 238000006073 displacement reaction Methods 0.000 claims abstract description 119
- 238000000034 method Methods 0.000 claims abstract description 39
- 230000008569 process Effects 0.000 claims abstract description 21
- 238000002474 experimental method Methods 0.000 claims abstract description 18
- 238000011084 recovery Methods 0.000 claims abstract description 16
- 238000005406 washing Methods 0.000 claims abstract description 11
- 238000010998 test method Methods 0.000 claims abstract description 3
- 239000003921 oil Substances 0.000 claims description 92
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 85
- 239000010779 crude oil Substances 0.000 claims description 82
- 238000002347 injection Methods 0.000 claims description 68
- 239000007924 injection Substances 0.000 claims description 68
- 239000011148 porous material Substances 0.000 claims description 25
- 239000011435 rock Substances 0.000 claims description 25
- 239000011159 matrix material Substances 0.000 claims description 18
- 239000000463 material Substances 0.000 claims description 16
- 238000010276 construction Methods 0.000 claims description 14
- 238000005213 imbibition Methods 0.000 claims description 14
- 239000007788 liquid Substances 0.000 claims description 14
- 206010017076 Fracture Diseases 0.000 claims description 12
- 238000010438 heat treatment Methods 0.000 claims description 11
- 238000005481 NMR spectroscopy Methods 0.000 claims description 10
- 239000012530 fluid Substances 0.000 claims description 8
- 230000003595 spectral effect Effects 0.000 claims description 8
- 238000004364 calculation method Methods 0.000 claims description 7
- 239000000243 solution Substances 0.000 claims description 7
- XLYOFNOQVPJJNP-ZSJDYOACSA-N Heavy water Chemical compound [2H]O[2H] XLYOFNOQVPJJNP-ZSJDYOACSA-N 0.000 claims description 6
- 239000002699 waste material Substances 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 5
- 229920006395 saturated elastomer Polymers 0.000 claims description 5
- 239000007864 aqueous solution Substances 0.000 claims description 4
- 230000008859 change Effects 0.000 claims description 4
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 4
- 239000011707 mineral Substances 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- 238000004088 simulation Methods 0.000 claims description 4
- 206010053206 Fracture displacement Diseases 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 239000008398 formation water Substances 0.000 claims description 3
- 239000000758 substrate Substances 0.000 claims description 3
- 238000009825 accumulation Methods 0.000 claims 1
- 238000011161 development Methods 0.000 abstract description 8
- 238000005516 engineering process Methods 0.000 description 10
- 238000001228 spectrum Methods 0.000 description 10
- 208000010392 Bone Fractures Diseases 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 6
- 239000003795 chemical substances by application Substances 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000003825 pressing Methods 0.000 description 3
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 2
- 239000003350 kerosene Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 208000013201 Stress fracture Diseases 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000005311 nuclear magnetism Effects 0.000 description 1
- 230000003204 osmotic effect Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000011780 sodium chloride Substances 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
- E21B47/00—Survey of boreholes or wells
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- 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
- E21B43/18—Repressuring or vacuum methods
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)
- Geophysics (AREA)
- Testing Or Calibration Of Command Recording Devices (AREA)
Abstract
The invention discloses a pressure-tight-mining integrated pressure-driving experimental device and a testing method for an oil reservoir. The invention also provides a pressure-tight-mining integrated pressure-flooding experimental test method for the oil reservoir. The invention simulates the pressure-tight-mining integrated pressure-driving process of the tight oil reservoir by an experimental method, quantitatively evaluates the pressure-driving seepage-sucking efficiency, the displacement oil-washing efficiency and the pressure-driving recovery ratio, can provide reference for the pressure-driving development scheme of the oil field, has reliable principle and strong operability, and has wide application prospect.
Description
Technical Field
The invention relates to the technical field of petroleum engineering, in particular to an oil reservoir pressure-tight-mining integrated pressure-driving experimental device and a testing method.
Background
With the development of oil and gas exploration and development technology, the current Chinese oil and gas exploration and development industry is trended towards unconventional oil and gas resources with lower abundance and poorer physical properties, and the hypotonic compact oil reservoir is an important component of unconventional resources. Aiming at the difficult problems of 'injection and production failure' faced by low-permeability dense oil reservoirs, the 'pressure-tight-production' integrated pressure-drive technology is proposed in the oilfield field in recent years, so that the reservoir flow channel can be improved, the stratum energy can be supplemented, the swept volume can be enlarged, the oil washing efficiency can be improved, and the purpose of improving the oil reservoir recovery ratio can be finally achieved.
The pressure-stuffy-mining integrated pressure-driving technology combines a single well fracturing technology, conventional water-driving development and oilfield chemical oil displacement technology to form a set of continuous and complete development technology. The application of the pressure flooding technology in oil fields mainly comprises 3 important processes: pressing, sealing and mining, wherein the pressing is that a large amount of clean water and an oil displacement agent are injected from the water well end at the pressure of micro fracture of a reservoir, and the reservoir fractures and cracks extend and simultaneously the oil displacement agent is displaced into the stratum pores along the cracks; the "stuffy" is to close the production well and the water injection well at the same time after the completion of the pressure flooding water injection, so that the stratum is kept in a "sealed" state, and then the injected water in the stratum fracture and the crude oil in the matrix are subjected to oil-water displacement under the action of stratum imbibition power (capillary force and osmotic pressure), so that the oil saturation in the fracture is improved; the production well and the water injection well are opened at the same time, the effective displacement of the reservoir is realized by the water injection of the water injection well and the oil extraction of the production well, and the oil reservoir recovery ratio is improved.
The pressure flooding technology is one of key means for developing the low-permeability dense oil reservoir in China, and is also one of the main technical difficulties in the oilfield. Because the pressure driving technology is started later, research is started from the aspects of technical mechanism, experimental method and the like in China at present. Related experimental researches on core displacement and matrix imbibition are carried out in China, but a whole set of continuous complete device for the pressure-stuffy-mining integrated pressure-flooding experiment is not researched, and the development of the pressure-flooding technology lacks experiment and theoretical support.
Disclosure of Invention
Aiming at the problems existing in the prior art, the invention provides a pressure-tight-mining integrated pressure-flooding experimental device and a testing method for truly simulating a tight oil reservoir.
The technical scheme adopted by the invention is as follows:
on one hand, the invention provides an oil reservoir 'pressure-stuffy-mining' integrated pressure-driving experimental device, which comprises a displacement pump, a first intermediate container, a second intermediate container, a core holder, a waste liquid collecting device and an information acquisition instrument,
the displacement pump is connected with the first intermediate container and the second intermediate container which are connected in parallel and respectively filled with simulated oil and pressure-driven injection liquid, the first intermediate container and the second intermediate container are connected to the inlet end of the core holder,
the outlet end of the core holder is provided with the waste liquid collecting device, the core holder is provided with a confining pressure device and a heating device, the core held in the core holder comprises a prefabricated artificial crack,
the information acquisition instrument is connected to the displacement pump, the core holder and the heating device and is used for acquiring experimental test data.
Preferably, the displacement pump is a constant speed constant pressure pump.
Preferably, the integrated pressure driving experimental device is provided with a pressure gauge and a thermometer.
On the other hand, the invention provides a tight oil reservoir 'pressure-tight-mining' integrated pressure-flooding experimental test method, which comprises the following steps:
step 1: preparing experimental materials based on characteristic parameters of target blocks of oil fields, wherein the experimental materials comprise a core, a simulated stratum aqueous solution, a pressure flooding injection liquid and simulated oil, and measuring the initial crude oil signal quantity V of the core 1 ；
Step 2: setting experimental pressure flooding displacement according to the on-site pressure flooding construction displacement, simulating a pressure flooding water injection process, stopping displacement when the experimental pressure flooding water injection quantity is met, and measuring crude oil signal quantity V after core pressure flooding water injection 2 ；
Step 3: optimizing the well closing time, closing the inlet end and the outlet end of the core holder, performing high-temperature high-pressure well closing simulation, and measuring the crude oil signal quantity V after the core is closed and imbibed 3 ；
Step 4: setting experimental displacement speed according to on-site conventional water injection displacement, simulating conventional water injection process, ending displacement when the change of oil-containing signal quantity of the rock core meets the requirement, and measuring the crude oil signal quantity V after rock core displacement 4 ；
Step 5: and (3) evaluating the imbibition efficiency of the closed well, the displacement oil washing efficiency or the pressure flooding recovery ratio in the pressure flooding process according to experimental test data.
Preferably, the step 1 further includes: preparing an artificial rock core according to the composition and physical parameters of reservoir rock minerals of a target block, wherein artificial cracks are prefabricated in the artificial rock core; by means of heavy water D 2 O standard formation water was formulated to simulate an aqueous formation solution.
Preferably, the step 1 further includes: placing the dried core into simulated oil, vacuumizing saturated simulated oil through a vacuum pump, taking out the core, placing the core into a drying oven for heating to simulate an aged core, and measuring initial crude oil signal quantity of the core through nuclear magnetic resonance equipment after drying;
preferably, the step 1 further includes: the core crude oil signal is the sum of the crude oil signal in the core pores and the crude oil signal in the cracks.
Preferably, the step 2 further includes: based on the linear velocity similarity principle, the on-site pressure-driving construction displacement is converted into laboratory displacement, and the displacement determining method comprises the following steps:
wherein: v 1 To drive at speed, Q c To construct the displacement, Q e For experimental displacement, N p The perforation quantity of the pressure-driving layer section S p For the area of a single perforation hole of the pressure driving section, S c The area of the injection end of the experimental core is shown.
Preferably, the step 2 further includes: the experimental pressure-driven water injection quantity determining method comprises the following steps:
wherein: v (V) L For experimental pressure-driving water injection quantity, V s For the on-site construction of the pressure-driven water injection quantity, V e Is the control range of the water injection well in the oilfield site,is the porosity of the oil field reservoir, r c To test the radius of the core, L c For the length of the experimental core>Is the porosity of the experimental core.
Preferably, the step 3 further includes: time t of well closing m The determining method comprises the following steps:
wherein: t is t e To test the well closing time, t m E is Young modulus, mu of experimental rock sample for on-site construction well closing time e To test the viscosity of fluid, r c To test the radius of the core, Q e Is the experimental flow.
Preferably, the step 4 further includes: determining an experimental displacement speed according to the conventional water injection displacement in the field:
wherein: v 2 To drive at speed, Q c1 For conventional water filling displacement, v e To test the displacement speed, N p The perforation quantity of the pressure-driving layer section S p For the area of a single perforation hole of the pressure driving section, S c The area of the injection end of the experimental core is shown.
Preferably, the step 5 further includes: based on the base material before and after the well and the crude oil T in the crack 2 Spectral signal variation, calculating oil-water imbibition efficiency E of stuffy well 1 The calculation formula is as follows:
wherein: e (E) 1 To smothering efficiency of stuffy well, V 2 Crude oil signal quantity after core pressure flooding water injection, V 3 Is the crude oil signal quantity after the core is closed and the well is imbibed, V 21 The medium oil signal quantity, V, in the matrix pores after the core is pressed and driven to be water injected 22 The signal quantity of the crude oil in the fracture after the core is pressed and driven to be water, V 31 Raw oil signal quantity in matrix pores after core is closed and imbibed, V 32 The method comprises the steps of (1) measuring a crude oil signal in a crack after a core is closed and imbibed;
based on the base material before and after displacement and the crude oil T in the cracks 2 Spectral signal variation, calculating the matrix wash oil efficiency E 2 Fracture displacement efficiency E 3 Or pressure recovery rate E T The calculation formula is as follows:
wherein: e (E) 2 For substrate oil washing efficiency, E 3 For crack displacement efficiency, E T For recovery of pressure flooding, V 2 Crude oil signal quantity after core pressure flooding water injection, V 4 For the crude oil signal quantity after the core displacement, V 21 The medium oil signal quantity, V, in the matrix pores after the core is pressed and driven to be water injected 22 The signal quantity of the crude oil in the fracture after the core is pressed and driven to be water, V 41 Is the signal quantity of crude oil in matrix pores after core displacement, V 42 Is the crude oil signal quantity in the fracture after the core is displaced.
Compared with the prior art, the invention has the advantages that: the invention provides a pressure-tight-mining integrated pressure-driving experimental device and a testing method for an oil reservoir.
Drawings
FIG. 1 is a schematic diagram of a pressure-tight-mining integrated pressure-driven experimental device for an oil reservoir.
In the figure: the device comprises a 1-information acquisition instrument, a 2-flowmeter, a 3-displacement pump, a 4-valve, a 5-first intermediate container, a 6-second intermediate container, a 7-pressure gauge, an 8-thermometer, a 9-core holder, a 10-confining pressure pump, a 11-heating device, a 12-waste liquid collection device and 13-connecting pipelines.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1, in one aspect, the invention provides an oil reservoir pressure-tightness-mining integrated pressure-driving experimental device, which comprises a displacement pump 3, a first intermediate container 5, a second intermediate container 6, a core holder 9, a waste liquid collecting device 12 and an information acquisition instrument 1 which are sequentially connected through a pipeline 13; the core holder 9 is also connected with a confining pressure pump 10 for applying pressure to the core arranged in the core holder 9 and a heating device 11 for heating the core; a pressure gauge 7 is connected between the first intermediate container 5, the second intermediate container 6 and the information acquisition instrument 1; a thermometer 8 is connected between the heating device 11 and the information acquisition instrument 1; a flowmeter 2 is connected between the displacement pump 3 and the information acquisition instrument 1. The displacement pump 3 may preferably be a constant-speed constant-pressure pump.
On the other hand, the invention provides a pressure-tight-mining integrated pressure-driving experimental device and a testing method for an oil reservoir, comprising the following steps:
step 1: preparing experimental materials based on characteristic parameters of target blocks of oil fields, wherein the experimental materials comprise a core, a simulated stratum aqueous solution, a pressure flooding injection liquid and simulated oil, and measuring the initial crude oil signal quantity V of the core 1 。
(1) Preparing a standard artificial rock core (diameter 2.5cm, length 5 cm) according to the composition and physical parameters of reservoir rock minerals of a target block, and prefabricating artificial cracks in the rock core;
(2) according to the industry standard water-based fracturing fluid evaluation method (SY/T5107-2005), heavy water (D 2 O) preparing standard stratum water (2.0% KCl+5.5% NaCl+0.45% MgCl) 2 +0.55％ CaCl 2 ) The method is characterized by comprising the steps of simulating stratum water solution, wherein the aim is to shield hydrogen signals of water phases in an oil-water two-phase seepage process through heavy water, and then the hydrogen signals detected by nuclear magnetic resonance equipment in a displacement process are all derived from simulated oil;
(3) preparing a pressure flooding injection liquid by using simulated formation water and an oil displacement agent according to a certain concentration;
(4) preparing simulated oil by kerosene and oil-soluble red solution according to a certain proportion;
(5) placing the dry core into simulated oil, and evacuating saturated simulated oil by vacuum pump for 24 hrAnd (3) taking out the core, putting the core into a drying oven for heating (60 ℃), simulating the aged core, taking out the core after 24 hours, and carrying out T on the core in the state through nuclear magnetic resonance equipment 2 Spectrum signal acquisition is carried out to obtain initial crude oil signal quantity V of the core 1 At the same time, the crude oil signal quantity V in the core pore space can be obtained 11 Crude oil signal quantity V in crack 12 Wherein V is 1 ＝V 11 +V 12 。
Step 2: setting experimental pressure flooding displacement according to the on-site pressure flooding construction displacement, simulating a pressure flooding water injection process, stopping displacement when the experimental pressure flooding water injection quantity is met, and measuring crude oil signal quantity V after core pressure flooding water injection 2 。
(1) Loading the core after saturated oil into a core holder 9, opening a confining pressure pump 10 and a heating device 11, setting pressure driving experiment loading conditions according to stratum stress and stratum temperature, determining the experiment temperature by the stratum temperature, and experimental confining pressure sigma c Determined by the following formula:
σ` Z ＝σ Z -αP P
σ` H ＝σ H -αP P
σ` h ＝σ h -αP P
σ c ＝(σ` Z +σ` H +σ h `)/3
wherein: sigma (sigma) z ' is effective vertical stress, sigma H ' is the effective maximum horizontal principal stress, sigma h ' is the effective minimum horizontal principal stress, sigma z Is vertical stress, sigma H Is the maximum horizontal principal stress, sigma h To minimum horizontal principal stress, P p Is the formation pore pressure, alpha is the effective stress coefficient, sigma c Is the experimental confining pressure.
(2) After the temperature and the confining pressure are stable, the displacement is started, and the constant speed constant pressure pump is used for driving the piston at a constant speed v 1 And injecting displacement fluid into the core. Based on the linear velocity similarity principle, the on-site pressure-driving construction displacement is converted into laboratory displacement, and the displacement is determined by the following formula:
wherein: v 1 To drive at speed, Q c To construct the displacement, Q e For experimental displacement, N p The perforation quantity of the pressure-driving layer section S p For the area of a single perforation hole of the pressure driving section, S c The area of the injection end of the experimental core is shown.
(3) Displacement to V L And when the displacement is stopped, the inlet and outlet of the core holder 9 are closed. Wherein the experimental pressure driving water injection quantity V L The field displacement volume is obtained by converting the pore volume, and the formula is as follows:
wherein: v (V) L For experimental pressure-driving water injection quantity, V s For the on-site construction of the pressure-driven water injection quantity, V e Is the control range of the water injection well in the oilfield site,is the porosity of the oil field reservoir, r c To test the radius of the core, L c For the length of the experimental core>Is the porosity of the experimental core.
(4) T by nuclear magnetic resonance apparatus 2 Spectrum signal acquisition is carried out to obtain crude oil signal quantity V after core pressure flooding water injection 2 At the same time, the crude oil signal quantity V in the core pore space can be obtained 21 Crude oil signal quantity V in crack 22 Wherein V is 2 ＝V 21 +V 22 。
Step 3: optimizing the well closing time, closing the inlet end and the outlet end of the core holder 9, performing high-temperature high-pressure well closing simulation, and measuring the crude oil signal quantity V after the core is closed and imbibed 3 And simulating the oil-water imbibition replacement process of the stuffy well.
(1) Closing the inlet and outlet of the core holder 9 to maintain the core in a high-temperature high-pressure well-tight stateThe state, the determination method of the temperature and the pressure is consistent with that in the step 1, and the well closing time t m Obtained by the following formula:
wherein: t is t e Is experimental well-closing time(s), t m The time(s) of the on-site construction well closing is that E is Young modulus (Pa) of an experimental rock sample, mu e For the viscosity of the experimental fluid (mPas), r c Radius (m), Q of experimental core e For the experimental flow rate (m 3 /s)。
(2) After the well is closed, T is carried out by nuclear magnetic resonance equipment 2 Spectrum signal acquisition is carried out to obtain crude oil signal quantity V after core closed well imbibition 3 At the same time, the crude oil signal quantity V in the core pore space can be obtained 31 Crude oil signal quantity V in crack 32 Wherein V is 3 ＝V 31 +V 32 。
Step 4: setting experimental displacement speed according to on-site conventional water injection displacement, simulating conventional water injection process, ending displacement when the change of oil-containing signal quantity of the rock core meets the requirement, and measuring the crude oil signal quantity V after rock core displacement 4 。
(1) Opening the inlet and outlet of the core holder 9, at a constant speed v by a constant speed constant pressure pump 2 And injecting displacement fluid into the core. Based on the linear velocity similarity principle, the on-site conventional water injection displacement is converted into a laboratory displacement velocity, and the displacement is determined by the following formula:
wherein: v 1 For displacement speed (m/s), Q c1 For conventional water filling displacement (m 3 /s)，Q e To test the displacement speed (m/s), N p The perforation quantity of the pressure-driving layer section S p Area (m) of single perforation for pressure driving section 2 )，S c For the experimental core injection end area (m 2 )。
(2) Every 30Nuclear magnetism T for testing oil signals in rock core in min 2 Spectrum up to core T 2 The map shows that the oil-containing signal quantity difference is less than 5%, and the displacement is finished.
(3) After the displacement is finished, T is carried out through nuclear magnetic resonance equipment 2 Spectrum signal acquisition is carried out to obtain crude oil signal quantity V after core displacement 4 At the same time, the crude oil signal quantity V in the core pore space can be obtained 41 Crude oil signal quantity V in crack 42 Wherein V is 4 ＝V 41 +V 42 。
Step 5: and (3) evaluating the imbibition efficiency of the closed well, the displacement oil washing efficiency or the pressure flooding recovery ratio in the pressure flooding process according to experimental test data.
(1) Based on the base material before and after the well and the crude oil T in the crack 2 Spectral signal variation, calculating oil-water imbibition efficiency E of stuffy well 1 The calculation formula is as follows:
wherein: e (E) 1 To smothering efficiency of stuffy well, V 2 Crude oil signal quantity after core pressure flooding water injection, V 3 Is the crude oil signal quantity after the core is closed and the well is imbibed, V 21 The medium oil signal quantity, V, in the matrix pores after the core is pressed and driven to be water injected 22 The signal quantity of the crude oil in the fracture after the core is pressed and driven to be water, V 31 Raw oil signal quantity in matrix pores after core is closed and imbibed, V 32 And (5) the raw oil signal quantity in the cracks after the core is closed and the well is imbibed.
(2) Based on the base material before and after displacement and the crude oil T in the cracks 2 Spectral signal variation, calculating the matrix wash oil efficiency E 2 Fracture displacement efficiency E 3 Pressure recovery factor E T The calculation formula is as follows:
wherein: e (E) 2 For substrate oil washing efficiency, E 3 For crack displacement efficiency, E T For recovery of pressure flooding, V 2 Crude oil signal quantity after core pressure flooding water injection, V 4 For the crude oil signal quantity after the core displacement, V 21 The medium oil signal quantity, V, in the matrix pores after the core is pressed and driven to be water injected 22 The signal quantity of the crude oil in the fracture after the core is pressed and driven to be water, V 41 Is the signal quantity of crude oil in matrix pores after core displacement, V 42 Is the crude oil signal quantity in the fracture after the core is displaced.
Computing examples
The invention is further illustrated by the following calculation examples in order to facilitate a full understanding of the technical step details and advantages of the invention by a person skilled in the art.
Step 1: preparing experimental materials based on characteristic parameters of target blocks of oil fields, wherein the experimental materials comprise a core, a simulated stratum aqueous solution, a pressure flooding injection liquid and simulated oil, and measuring the initial crude oil signal quantity V of the core 1 。
Preparing a standard artificial rock core according to the reservoir rock mineral composition and physical parameters of the target block, and prefabricating artificial cracks in the rock core; by means of heavy water (D 2 O) preparing standard stratum water and pressure-flooding injection liquid; preparing simulated oil by using kerosene and oil-soluble red solution according to a volume ratio of 10:1; saturated simulated oil is pumped out by a vacuum pump for 24 hours, the core is heated, the aged core is simulated for 24 hours, and the core T is carried out by nuclear magnetic resonance equipment 2 And acquiring spectrum signals to obtain the initial crude oil signal quantity of 26556 of the core, and simultaneously obtaining the crude oil signal quantity 24156 in the pores of the core and the crude oil signal quantity 2400 in the cracks.
Step 2: setting experimental pressure flooding displacement according to the on-site pressure flooding construction displacement, simulating a pressure flooding water injection process, stopping displacement when the experimental pressure flooding water injection quantity is met, and measuring crude oil information after core pressure flooding water injectionNumber V 2 。
And setting a pressure flooding experiment loading condition according to the stratum stress and the stratum temperature, determining an experiment temperature (85 ℃) according to the stratum temperature, and calculating the experiment confining pressure through a formula to obtain 5MPa.
Based on the linear velocity similarity principle, the on-site pressure driving construction displacement (1 m 3 Conversion to laboratory displacement (0.5 cm) 3 After the temperature and confining pressure are stable, starting displacement, and using a constant-speed constant-pressure pump to make constant speed be 0.1cm 3 And injecting displacement fluid into the core per minute.
The pressure-driven water injection rate of the single well on site is 20000m 3 According to the formula, the water injection quantity V is converted into the laboratory pressure drive water injection quantity V L 45.5cm 3 Is displaced to V L And stopping displacement and closing the inlet and outlet of the core holder when the displacement is stopped.
T by nuclear magnetic resonance apparatus 2 And acquiring spectrum signals to obtain crude oil signal quantity 22562 after the core is subjected to pressure flooding water injection, and simultaneously obtaining crude oil signal quantity 21537 in the core pore space and crude oil signal quantity 1025 in the crack.
Step 3: optimizing the well closing time, closing the inlet end and the outlet end of the core holder, performing high-temperature high-pressure well closing simulation, and measuring the crude oil signal quantity V after the core is closed and imbibed 3 。
Closing an inlet and an outlet of the core holder to enable the core to keep a high-temperature high-pressure well-closing state, wherein the well-closing time of an oilfield site is 30d, and the well-closing time of a laboratory is t m Obtained by the following formula for 85.6 hours.
After the end of the well closing, throughNuclear magnetic resonance apparatus T 2 And acquiring spectrum signals to obtain crude oil signal quantity 22548 after the core is closed and imbibed, and simultaneously obtaining crude oil signal quantity 20685 in the core pore space and crude oil signal quantity 1863 in the crack.
Step 4: setting experimental displacement speed according to on-site conventional water injection displacement, simulating conventional water injection process, ending displacement when the change of oil-containing signal quantity of the rock core meets the requirement, and measuring the crude oil signal quantity V after rock core displacement 4 。
Based on the linear velocity similarity principle, the on-site conventional water injection displacement (30 m 3 Conversion to laboratory displacement speed (0.01 cm) 3 /min), at a constant speed of 0.01cm by means of a constant-speed constant-pressure pump 3 And injecting displacement fluid into the core per minute.
Nuclear magnetism T for testing oil signals in core every 30min 2 Spectrum up to core T 2 The map shows that the oil-containing signal quantity difference is less than 5%, and the displacement is finished. Then T is carried out by nuclear magnetic resonance equipment 2 And acquiring spectrum signals to obtain a crude oil signal quantity 12959 after core displacement, and simultaneously obtaining a crude oil signal quantity 12734 in the core pore and a crude oil signal quantity 225 in the crack.
Step 5: and (3) evaluating the imbibition efficiency of the closed well, the displacement oil washing efficiency or the pressure flooding recovery ratio in the pressure flooding process according to experimental test data.
Based on the base material before and after the well and the crude oil T in the crack 2 Spectral signal variation, calculating oil-water imbibition efficiency E of stuffy well 1 3.7%.
Based on the base material before and after displacement and the crude oil T in the cracks 2 Spectral signal variation, calculating the matrix wash oil efficiency E 2 47.3% of crack displacement efficiency E 3 78.0% and recovery ratio of pressure floodingE T 42.6%.
Firstly, preparing an experimental material according to characteristic parameters of an oilfield target block; optimizing experimental pressure flooding displacement based on a linear velocity similarity principle, and simulating a pressure flooding water injection process; optimizing the well closing time according to a formula, and simulating the oil-water imbibition replacement process of the well closing; then optimizing the displacement speed of a laboratory and simulating the conventional water injection production process; and finally, evaluating the imbibition efficiency of the closed well, the displacement oil washing efficiency and the pressure drive recovery ratio in the pressure drive process according to experimental results. The pressure-tight-mining integrated pressure-driving process of the dense oil reservoir of the oil field is simulated through an experimental method, and the pressure-driving seepage-sucking efficiency, the displacement oil-washing efficiency and the pressure-driving recovery ratio are quantitatively evaluated. Provides reference for the next-step pressure flooding development scheme of the oil field, has reliable principle and strong operability and has wide application prospect.
The present invention is not limited to the above-mentioned embodiments, but is not limited to the above-mentioned embodiments, and any person skilled in the art can make some changes or modifications to the equivalent embodiments without departing from the scope of the technical solution of the present invention, but any simple modification, equivalent changes and modifications to the above-mentioned embodiments according to the technical substance of the present invention are still within the scope of the technical solution of the present invention.
Claims (10)
1. An oil reservoir 'pressure-stuffy-mining' integrated pressure-drive experimental device is characterized by comprising a displacement pump, a first intermediate container, a second intermediate container, a core holder, a waste liquid collecting device and an information acquisition instrument,
the displacement pump is connected with the first intermediate container and the second intermediate container which are connected in parallel and respectively filled with simulated oil and pressure-driven injection liquid, the first intermediate container and the second intermediate container are connected to the inlet end of the core holder,
the outlet end of the core holder is provided with the waste liquid collecting device, the core holder is provided with a confining pressure device and a heating device, the core held in the core holder comprises a prefabricated artificial crack,
the information acquisition instrument is connected to the displacement pump, the core holder and the heating device and is used for acquiring experimental test data.
2. The oil reservoir pressure-tightness-mining integrated pressure-flooding experimental test method is characterized by comprising the following steps of:
step 1: preparing experimental materials based on characteristic parameters of target blocks of oil fields, wherein the experimental materials comprise a core, a simulated stratum aqueous solution, a pressure flooding injection liquid and simulated oil, and measuring the initial crude oil signal quantity V of the core 1 ；
Step 2: setting experimental pressure flooding displacement according to the on-site pressure flooding construction displacement, simulating a pressure flooding water injection process, stopping displacement when the experimental pressure flooding water injection quantity is met, and measuring crude oil signal quantity V after core pressure flooding water injection 2 ；
Step 3: optimizing the well closing time, closing the inlet end and the outlet end of the core holder, performing high-temperature high-pressure well closing simulation, and measuring the crude oil signal quantity V after the core is closed and imbibed 3 ；
Step 4: setting experimental displacement speed according to on-site conventional water injection displacement, simulating conventional water injection process, ending displacement when the change of oil-containing signal quantity of the rock core is small, and measuring the crude oil signal quantity V after the displacement of the rock core 4 ；
Step 5: and (3) evaluating the imbibition efficiency of the closed well, the displacement oil washing efficiency or the pressure flooding recovery ratio in the pressure flooding process according to experimental test data.
3. The method for testing the oil reservoir pressure-tight-mining integrated pressure-flooding experiment according to claim 2, wherein the step 1 further comprises: preparing an artificial rock core according to the composition and physical parameters of reservoir rock minerals of a target block, wherein artificial cracks are prefabricated in the artificial rock core; by means of heavy water D 2 O standard formation water was formulated to simulate an aqueous formation solution.
4. The method for testing the oil reservoir pressure-tight-mining integrated pressure-flooding experiment according to claim 2, wherein the dry core is placed into simulated oil, saturated simulated oil is pumped by a vacuum pump, the core is taken out and placed into a drying oven to be heated so as to simulate aged core, and the initial crude oil signal quantity of the core is measured by nuclear magnetic resonance equipment after drying.
5. The method for testing the oil reservoir pressure-tight-mining integrated pressure flooding experiment according to claim 2, wherein the crude oil signal quantity of the core is the sum of the crude oil signal quantity in the pores of the core and the crude oil signal quantity in the cracks.
6. The method for testing the oil reservoir pressure-tight-mining integrated pressure-flooding experiment according to claim 2, wherein the step 2 further comprises: based on the linear velocity similarity principle, the on-site pressure-driving construction displacement is converted into laboratory displacement, and the displacement determining method comprises the following steps:
wherein: v 1 To drive at speed, Q c To construct the displacement, Q e For experimental displacement, N p The perforation quantity of the pressure-driving layer section S p For the area of a single perforation hole of the pressure driving section, S c Injection end face for experimental rock coreAnd (3) accumulation.
7. The method for testing the oil reservoir pressure-tight-mining integrated pressure-flooding experiment according to claim 2, wherein the step 2 further comprises: the experimental pressure-driven water injection quantity determining method comprises the following steps:
wherein: v (V) L For experimental pressure-driving water injection quantity, V s For the on-site construction of the pressure-driven water injection quantity, V e Is the control range of the water injection well in the oilfield site,is the porosity of the oil field reservoir, r c To test the radius of the core, L c For the length of the experimental core>Is the porosity of the experimental core.
8. The method for testing the oil reservoir pressure-tight-mining integrated pressure-flooding experiment according to claim 2, wherein the step 3 further comprises: time t of well closing m The determining method comprises the following steps:
wherein: t is t e To test the well closing time, t m E is Young modulus, mu of experimental rock sample for on-site construction well closing time e To test the viscosity of fluid, r c To test the radius of the core, Q e Is the experimental flow.
9. The method for testing the oil reservoir pressure-tight-mining integrated pressure-flooding experiment according to claim 2, wherein the step 4 further comprises: determining an experimental displacement speed according to the conventional water injection displacement in the field:
wherein: v 2 To drive at speed, Q c1 For conventional water filling displacement, v e To test the displacement speed, N p The perforation quantity of the pressure-driving layer section S p For the area of a single perforation hole of the pressure driving section, S c The area of the injection end of the experimental core is shown.
10. The method for testing the oil reservoir pressure-tight-mining integrated pressure-flooding experiment according to claim 2 is characterized by comprising the following steps of 2 Spectral signal variation, calculating oil-water imbibition efficiency E of stuffy well 1 The calculation formula is as follows:
wherein: e (E) 1 To smothering efficiency of stuffy well, V 2 Crude oil signal quantity after core pressure flooding water injection, V 3 Is the crude oil signal quantity after the core is closed and the well is imbibed, V 21 The medium oil signal quantity, V, in the matrix pores after the core is pressed and driven to be water injected 22 The signal quantity of the crude oil in the fracture after the core is pressed and driven to be water, V 31 Raw oil signal quantity in matrix pores after core is closed and imbibed, V 32 The method comprises the steps of (1) measuring a crude oil signal in a crack after a core is closed and imbibed;
based on the base material before and after displacement and the crude oil T in the cracks 2 Spectral signal variation, calculating the matrix wash oil efficiency E 2 Fracture displacement efficiency E 3 Or pressure recovery rate E T The calculation formula is as follows:
wherein: e (E) 2 For substrate oil washing efficiency, E 3 For crack displacement efficiency, E T For recovery of pressure flooding, V 2 Crude oil signal quantity after core pressure flooding water injection, V 4 For the crude oil signal quantity after the core displacement, V 21 The medium oil signal quantity, V, in the matrix pores after the core is pressed and driven to be water injected 22 The signal quantity of the crude oil in the fracture after the core is pressed and driven to be water, V 41 Is the signal quantity of crude oil in matrix pores after core displacement, V 42 Is the crude oil signal quantity in the fracture after the core is displaced.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310552200.7A CN116480332A (en) | 2023-05-16 | 2023-05-16 | Oil reservoir pressure-tightness-mining integrated pressure-flooding experimental device and testing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310552200.7A CN116480332A (en) | 2023-05-16 | 2023-05-16 | Oil reservoir pressure-tightness-mining integrated pressure-flooding experimental device and testing method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116480332A true CN116480332A (en) | 2023-07-25 |
Family
ID=87213905
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310552200.7A Pending CN116480332A (en) | 2023-05-16 | 2023-05-16 | Oil reservoir pressure-tightness-mining integrated pressure-flooding experimental device and testing method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116480332A (en) |
-
2023
- 2023-05-16 CN CN202310552200.7A patent/CN116480332A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102608011B (en) | Method for determining and building bound water for crack-pore (hole) type reservoir core | |
| CN106596380B (en) | Shale staged fracturing horizontal well fracturing fluid flowback capability evaluation method and device | |
| CN103556993B (en) | Low permeability oil field plane Five-point method pattern carbon dioxide flooding emulation experiment analogy method | |
| CN107905778A (en) | Supercritical CO2The enhanced geothermal system experimental provision of fluid fracturing and method | |
| CN103556994B (en) | The experiment detecting system of fractured-vuggy reservoir remaining oil distribution and detection method | |
| CN106837269B (en) | Low, the extra-low permeability oil reservoirs CO of one kind2Drive nearly miscible pressure area determination method | |
| CN106153856B (en) | One kind evaluating apparatus of shale stability containing crack and method | |
| CN110346258A (en) | A kind of tight rock oil relative permeability method for measuring | |
| CN109946436B (en) | Fracture-property dense gas layer working fluid damage evaluation method considering both foundation block and fracture | |
| CN103233725A (en) | Device and method for determining high temperature and high pressure full diameter core mud pollution evaluation | |
| RU2697421C1 (en) | Integrated gas-proof measuring device for gas content measurement | |
| CN210834567U (en) | Shale mixes wettability experiment testing arrangement | |
| Sergeev et al. | Experimental research of the colloidal systems with nanoparticles influence on filtration characteristics of hydraulic fractures | |
| CN111075441B (en) | Three-dimensional physical simulation experiment device and method for cold recovery after thermal recovery of side-bottom water heavy oil reservoir | |
| CN109138998A (en) | A kind of experimental test procedures of low permeability reservoir high temperature and pressure imbibition oil-recovering rate | |
| CN110595953A (en) | Experimental test device and method for shale mixing wettability | |
| CN103674593B (en) | A kind of device and method for simulating the flood pot test of low permeability reservoir pressure break straight well | |
| CN103940715A (en) | Simulating experiment method of rock natural seepage ability | |
| CN105804738A (en) | Visualization evaluation device for stability and integrity of clay shale borehole wall | |
| CN108287123A (en) | A kind of measurement CO2The visualization device and method of solid-carrying performance under the conditions of fracturing fluid high pressure dynamic filtration | |
| CN108225998A (en) | Acid stimulation analogue experiment method under 7 cm diameter rock core stratum temperature and pressure | |
| CN110879196B (en) | Oil-water phase permeability testing method for oil-rich condensate gas reservoir | |
| CN106777515A (en) | A kind of method based on core experiment analysis tight gas wells production capacity | |
| Zhang et al. | An integrated method to evaluate formation damage resulting from water and alkali sensitivity in dongping bedrock reservoir | |
| CN109946437B (en) | Fractured compact reservoir working fluid damage evaluation method considering both base block and fracture system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |