CN105239973A - Condensate gas reservoir blockage relieving physical simulation experimental device and condensate gas reservoir blockage relieving physical simulation experimental method - Google Patents
Condensate gas reservoir blockage relieving physical simulation experimental device and condensate gas reservoir blockage relieving physical simulation experimental method Download PDFInfo
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- CN105239973A CN105239973A CN201510709772.7A CN201510709772A CN105239973A CN 105239973 A CN105239973 A CN 105239973A CN 201510709772 A CN201510709772 A CN 201510709772A CN 105239973 A CN105239973 A CN 105239973A
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- 238000002474 experimental method Methods 0.000 title abstract 4
- 239000011435 rock Substances 0.000 claims abstract description 28
- 238000002347 injection Methods 0.000 claims abstract description 19
- 239000007924 injection Substances 0.000 claims abstract description 19
- 238000007405 data analysis Methods 0.000 claims abstract description 7
- 238000009833 condensation Methods 0.000 claims abstract description 5
- 230000005494 condensation Effects 0.000 claims abstract description 5
- 238000005086 pumping Methods 0.000 claims abstract description 5
- 239000007789 gas Substances 0.000 claims description 127
- 238000000605 extraction Methods 0.000 claims description 16
- 239000008398 formation water Substances 0.000 claims description 15
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Abstract
The invention relates to a condensate gas reservoir blockage relieving physical simulation experimental device and a condensate gas reservoir blockage relieving physical simulation experimental method, and belongs to the technical field of oil field development experiment. The experimental device consists of a condensate gas reservoir model, an injection system, a production system and a data analysis system. The experimental device is used for performing preparation for simulating a rock core of a gas layer main model and simulating a rock core of a near wellbore zone model; the prepared rock cores are subjected to vacuum pumping and saturated gas condensation; a condensate gas reservoir blockage relieving experimental model is built; condensate gas reservoir seepage flow passage blockage simulation experiments and blockage relieving simulation experiments are performed; a condensate gas reservoir blockage relieving scheme is made according to obtained experimental data; the stratum temperature, the pressure and the depletion development process of the condensate gas reservoir can be simulated in a laboratory; the dynamic simulation of the depressurizing production and the gas injection swallowing-spitting blockage relieving of the condensate gas reservoir is realized; the blockage relieving gas injection quantity and the injection period of the simulated condensate gas reservoir are determined; the operation is simple and convenient; the implementation is easy; and the investment of a large amount of labor, materials and money on site is not needed.
Description
Technical field
The present invention relates to a kind of gas condensate reservoir de-plugging physical simulation experiment device and experimental technique thereof, belong to oil field development experimental technique field.
Background technology
Gas condensate reservoir is in the process of exploitation, and below Pressure Drop to dew point, natural gas can transfer liquid state to and separate out with the form of condensate, retrograde condensation phenomenon that Here it is.Retrograde condensed liquid accumulates near wellbore zone, will cause the blocking of stratum filtration passage, gas well deliverability is declined, cause material impact to the exploitation of gas reservoir, and therefore carrying out de-plugging to gas condensate reservoir is key issue on condensate reservoir development.Application number be 200410081127.7 a kind of condensate gas well gas injection of handling up that patent discloses remove the method that near wellbore zone retrograde condensed liquid pollutes, the method passes through dynamic analysis, determine by the condensate gas well of retrograde condensed liquid blocking, after closing well removes the liquid collecting of well chamber, transform producing well as gas injection well, Xiang Jingzhong injects natural gas and handles up, until gas well returns to normal production.The defect of the method directly produces at the scene on gas well to operate, and Xiang Jingzhong injects natural gas needs long-time stewing well to build the pressure, and affects the gas well normal production time, need in addition to inject a large amount of natural gas, workload is large, costly, plugging removal effect is uncontrollable, is difficult to meet needs of production.
Summary of the invention
The present invention seeks to the site work amount that exists for above-mentioned prior art large, affect gas well normal production time, injection natural gas costly, plugging removal effect is uncontrollable, the defect that is difficult to meet needs of production, provides a kind of gas condensate reservoir de-plugging physical simulation experiment device.
Another object of the present invention is to provide a kind of gas condensate reservoir de-plugging physical simulation experiment method.
The object of the present invention is achieved like this:
The invention provides a kind of gas condensate reservoir de-plugging physical simulation experiment device, described experimental facilities is made up of gas condensate reservoir model, injected system, extraction system, data analysis system, wherein:
Gas condensate reservoir model is composed in series by two core holding units, a core holding unit installs the rock core of simulation gas-bearing formation master cast, another core holding unit installs the rock core of simulation near wellbore zone model, two core holding units are all enclosed with adjustable constant temperature heater, and all have pressurization hole, and be communicated with by pressurized pipeline, pressurized pipeline is parallel with ring pressure measuring pump, the import of First core holding unit is connected with injected system, and the outlet of second core holding unit is connected with extraction system;
Injected system is made up of high pressure constant voltage constant speed measuring pump, compounding device, simulated formation water receptacle, gas injection container, high pressure constant voltage constant speed measuring pump is connected to the import of First core holding unit by compounding device, simulated formation water receptacle is connected in parallel on the connecting pipeline of First core holding unit, gas injection container is connected in parallel on the outlet line of another core holding unit, and simulated formation water receptacle and gas injection container are all connected with high pressure constant voltage constant speed measuring pump by pipeline;
Extraction system is made up of temperature controlled air bath, back pressure control system, three phase separator, electronic balance, aerometer gauge, and the outlet line of second core holding unit is connected to three phase separator; Back pressure control system regulates high-pressure metering pump to be composed in series by back pressure regulator, high pressure nitrogen intermediate receptacle, back pressure, and back pressure regulator is arranged on the outlet line of second core holding unit; Temperature controlled air bath is hollow box-shaped body, and the back pressure regulator of back pressure control system and high pressure nitrogen intermediate receptacle are placed in temperature controlled air bath; Three phase separator is connected with aerometer gauge and electronic balance respectively;
Data analysis system is made up of Density Measuring Instrument, gas chromatograph, computer, and between the electronic balance that Density Measuring Instrument is connected to extraction system and computer, gas chromatograph is connected between aerometer gauge and computer.
The present invention also provides a kind of gas condensate reservoir de-plugging physical simulation experiment method, and described experimental technique comprises the following steps:
The rock core of the rock core and simulation near wellbore zone model of 1, simulating gas-bearing formation master cast prepares;
2, the ready rock core of step 1 is vacuumized, saturated condensate gas, set up gas condensate reservoir de-plugging experimental model;
3, according to the gas condensate reservoir de-plugging experimental model that step 2 is set up, simulation gas condensate reservoir seepage channel blocking experiment is carried out;
4, according to the gas condensate reservoir experimental model after the blocking of setting up through step 3, simulation gas condensate reservoir de-plugging experiment is carried out;
5, according to the experimental data that step 3 and step 4 obtain, gas condensate reservoir de-plugging scheme is formulated.
The present invention is by setting up gas condensate reservoir de-plugging physical simulation experiment device, can in the formation temperature of experiment lab simulation gas condensate reservoir, pressure and During Natural Depletion process, realize the step-down exploitation of gas condensate reservoir, the dynamic analog of huff and puff de-plugging, determine de-plugging injected gas volume and the injection cycle of simulating gas condensate reservoir.The present invention is easy to operation, when dropping into a large amount of human and material resources, financial resources without the need to scene, namely can be on-the-spot gas injection de-plugging and provides scheme, meet production requirement.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of experimental facilities of the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is described further.
As shown in Figure 1, the invention provides a kind of gas condensate reservoir de-plugging physical simulation experiment device, described experimental facilities is made up of gas condensate reservoir real mould, injected system, extraction system, data analysis system, wherein:
Gas condensate reservoir model is composed in series by two core holding units 1a, 1b, core holding unit 1a installs the rock core 1h of simulation gas-bearing formation master cast, core holding unit 1b installs the rock core 1i of simulation near wellbore zone model, and two core holding units are all enclosed with adjustable constant temperature heater; Core holding unit 1a, 1b have pressurization hole 1c, 1d, and be communicated with by pressurized pipeline, pressurized pipeline is parallel with ring pressure measuring pump 1g, and the import 1e of core holding unit 1a is connected with injected system, and the outlet 1f of core holding unit 1b is connected with extraction system.
Injected system is made up of high pressure constant voltage constant speed measuring pump 2a, compounding device 2b, simulated formation water receptacle 2g, gas injection container 2h, high pressure constant voltage constant speed measuring pump 2a is connected to the import 1e of core holding unit 1a by compounding device 2b, simulated formation water receptacle 2g is connected in parallel on the connecting pipeline between core holding unit 1a and core holding unit 1b, gas injection container 2h is connected in parallel on the outlet line of core holding unit 1b, and simulated formation water receptacle 2g and gas injection container 2h are all connected with high pressure constant voltage constant speed measuring pump 2a by pipeline; Formation water in simulated formation water receptacle 2g is for simulating limit water or the end water of gas condensate reservoir, and the gas in gas injection container 2h is the injecting gas of de-plugging.
Extraction system bathes 3a by temperature controlled air, back pressure control system, three phase separator 3f, electronic balance 3h, aerometer gauge 3g form, and the outlet line of core holding unit 1b is connected to three phase separator 3f; Back pressure control system regulates high-pressure metering pump 3e to be composed in series by back pressure regulator 3c, high pressure nitrogen intermediate receptacle 3d, back pressure, and back pressure regulator 3c is connected in parallel on the outlet line of core holding unit 1b; Temperature controlled air bath 3a is hollow box-shaped body, and the back pressure regulator 3c of back pressure control system and high pressure nitrogen intermediate receptacle 3d is placed in temperature controlled air bath 3a; Three phase separator 3f is connected with aerometer gauge 3g and electronic balance 3h respectively.
Data analysis system is made up of Density Measuring Instrument 4a, gas chromatograph 4b, computer 4c, and Density Measuring Instrument 4a is connected between the electronic balance 3h of extraction system and computer 4c, and gas chromatograph 4b is connected between aerometer gauge 3g and computer 4c.
Described compounding device 2b is formed in parallel by sample device 2d and condensate gas container 2e, is connected respectively by communicating valve 2c, 2f with the import 1e of high pressure constant voltage constant speed measuring pump 2a, core holding unit 1a, can be experiment and provides reliable and stable condensation source of the gas.
Be provided with high pressure observation port 3b between described core holding unit 1b outlet line and the back pressure regulator 3c of back pressure control system, high pressure observation port 3b is placed in temperature controlled air bath 3a, can the flowing of Real Time Observation fluid.
The present invention also provides a kind of gas condensate reservoir de-plugging physical simulation experiment method, and described experimental technique comprises the steps:
The rock core of the rock core and simulation near wellbore zone model of 1, simulating gas-bearing formation master cast prepares:
After two groups of rock cores 1h, 1i being carried out washing oil, oven dry, mensuration degree of porosity and air permeability, sequence, be respectively charged in two core holding units 1a, 1b: first washing oil, oven dry, mensuration degree of porosity and air permeability are carried out to the rock core 1h of one group of simulation gas-bearing formation master cast, then according to every block rock core length and air permeability values, sort according to Bradley rule, load successively in heat-shrink tube, be assembled into the long cores of 2 meters, load in the core holding unit 1a of gas condensate reservoir model with after gum cover sealing; With same method, the rock core 1i washing oil of another group simulation near wellbore zone model, oven dry, mensuration degree of porosity and air permeability, sequence are loaded in the core holding unit 1b of gas condensate reservoir model.
2, step 1 ready rock core 1h, 1i are vacuumized, saturated condensate gas, set up gas condensate reservoir de-plugging experimental model:
Rock core 1i in rock core 1h, core holding unit 1b in core holding unit 1a is vacuumized, by high pressure constant voltage constant speed measuring pump 2a, the stratum condensate gas in the sample device 2d prepared is injected in core holding unit 1a and core holding unit 1b with simulated formation pressure, until by rock core 1h, 1i saturation condensate gas, set up gas condensate reservoir de-plugging experimental model.
3, according to the gas condensate reservoir de-plugging experimental model that step 2 is set up, carry out simulation gas condensate reservoir seepage channel blocking experiment, concrete steps are as follows:
3.1 pass through high pressure constant voltage constant speed measuring pump 2a by formation water in simulated formation water receptacle 2g, are pumped in the rock core 1h of core holding unit 1a and the rock core 1i of core holding unit 1b, termination of pumping by the actual pressure P1 of gas condensate reservoir;
3.2 open gas condensate reservoir experimental model outlet 1f place valve is communicated with extraction system, retrograde condensation phenomenon in simulation gas condensate reservoir step-down exhaustion recovery process, back pressure control system is utilized to carry out the outlet pressure of Control release model, utilize temperature controlled air to bathe 3a extraction fluid is kept at the formation temperature, the phase Characteristics of effluent is observed by high pressure observation port 3b, until seepage channel blocks completely, record the output of fluid in gas condensate reservoir experimental model pressure P 2 and three phase separator 3f, oil, the weight of water is claimed by electronic balance 3h, gas from gas quantifier 3g measures.
4, according to the gas condensate reservoir experimental model after the blocking of setting up through step 3, carry out simulation gas condensate reservoir de-plugging experiment, concrete steps are as follows:
The gas of de-plugging is injected in core holding unit 1b by injected gas container 2h with high pressure constant voltage constant speed measuring pump 2a by 4.1, and termination of pumping, until the pressure balance of gas condensate reservoir experimental model entrance end, records the injected gas scale of construction;
4.2 open core holding unit 1b exports 1f place valve, carries out secondary simulation gas condensate reservoir step-down exhaustion recovery process, records the output of fluid in gas condensate reservoir experimental model pressure P 3, effluent phase Characteristics and three phase separator 3f;
If 4.3 gas condensate reservoir experimental models again retrograde condensate blockage occur, repeat above-mentioned steps 4.1 and 4.2, until de-plugging completely.
5, according to the experimental data that step 3 and step 4 obtain, gas condensate reservoir de-plugging scheme is formulated:
Output oil density is measured by Density Measuring Instrument 4a, gas composition analysis is carried out by gas chromatograph 4b, through computer 4c process, draw the analysis report of temperature, pressure, recovery ratio etc. of the change of output oil quality, density, the speed of response, the component of output gas and each component proportion, de-plugging experiment, sum up the de-plugging injected gas volume of simulation gas condensate reservoir and inject periodic law, formulating gas condensate reservoir de-plugging scheme.
Claims (6)
1. a gas condensate reservoir de-plugging physical simulation experiment device, is made up of gas condensate reservoir model, injected system, extraction system, data analysis system, it is characterized in that:
Gas condensate reservoir model is composed in series by two core holding units, a core holding unit installs the rock core of simulation gas-bearing formation master cast, another core holding unit installs the rock core of simulation near wellbore zone model, two core holding units are all enclosed with adjustable constant temperature heater, and all have pressurization hole, and be communicated with by pressurized pipeline, pressurized pipeline is parallel with ring pressure measuring pump, the import of First core holding unit is connected with injected system, and the outlet of second core holding unit is connected with extraction system;
Injected system is made up of high pressure constant voltage constant speed measuring pump, compounding device, simulated formation water receptacle, gas injection container, high pressure constant voltage constant speed measuring pump is connected to the import of First core holding unit by compounding device, simulated formation water receptacle is connected in parallel on the connecting pipeline of First core holding unit, gas injection container is connected in parallel on the outlet line of another core holding unit, and simulated formation water receptacle and gas injection container are all connected with high pressure constant voltage constant speed measuring pump by pipeline;
Extraction system is made up of temperature controlled air bath, back pressure control system, three phase separator, electronic balance, aerometer gauge, and the outlet line of second core holding unit is connected to three phase separator; Back pressure control system regulates high-pressure metering pump to be composed in series by back pressure regulator, high pressure nitrogen intermediate receptacle, back pressure, and back pressure regulator is arranged on the outlet line of second core holding unit; Temperature controlled air bath is hollow box-shaped body, and the back pressure regulator of back pressure control system and high pressure nitrogen intermediate receptacle are placed in temperature controlled air bath; Three phase separator is connected with aerometer gauge and electronic balance respectively;
Data analysis system is made up of Density Measuring Instrument, gas chromatograph, computer, and between the electronic balance that Density Measuring Instrument is connected to extraction system and computer, gas chromatograph is connected between aerometer gauge and computer.
2. gas condensate reservoir de-plugging physical simulation experiment device according to claim 1, it is characterized in that: compounding device is formed in parallel by sample device and condensate gas container, be connected with the import of high pressure constant voltage constant speed measuring pump, First core holding unit respectively by communicating valve.
3. gas condensate reservoir de-plugging physical simulation experiment device according to claim 1 and 2, it is characterized in that: be provided with high pressure observation port between second described core holding unit outlet line and the back pressure regulator of back pressure control system, high pressure observation port is placed in temperature controlled air bath.
4. a gas condensate reservoir de-plugging physical simulation experiment method, is characterized in that comprising the following steps:
(1) rock core of the rock core and simulation near wellbore zone model of simulating gas-bearing formation master cast prepares;
(2) to step (1), ready rock core vacuumizes, saturated condensate gas, sets up gas condensate reservoir de-plugging experimental model;
(3) according to the gas condensate reservoir de-plugging experimental model that step (2) is set up, simulation gas condensate reservoir seepage channel blocking experiment is carried out;
(4) according to the gas condensate reservoir experimental model after the blocking that step (3) is set up, simulation gas condensate reservoir de-plugging experiment is carried out;
(5) according to the experimental data that step (3) and step (4) obtain, gas condensate reservoir de-plugging scheme is formulated.
5. gas condensate reservoir de-plugging physical simulation experiment method according to claim 4, is characterized in that the step simulating gas condensate reservoir seepage channel blocking experiment is as follows:
(1) by high pressure constant voltage constant speed measuring pump by formation water in simulated formation water receptacle, be pumped in the rock core of core holding unit by the actual pressure of gas condensate reservoir, termination of pumping;
(2) open gas condensate reservoir experimental model exit valve and be communicated with extraction system, retrograde condensation phenomenon in simulation gas condensate reservoir step-down exhaustion recovery process, back pressure control system is utilized to carry out the outlet pressure of Control release model, utilize temperature controlled air to bathe extraction fluid is kept at the formation temperature, the phase Characteristics of effluent is observed by high pressure observation port, until seepage channel blocks completely, record the output of fluid in gas condensate reservoir experimental model pressure and three phase separator, the weight of oil, water is claimed by electronic balance, and gas from gas quantifier measures.
6. the gas condensate reservoir de-plugging physical simulation experiment method according to claim 4 or 5, is characterized in that the step simulating gas condensate reservoir de-plugging experiment is as follows:
(1) with high pressure constant voltage constant speed measuring pump, the gas of de-plugging is injected in core holding unit by injected gas container, termination of pumping, until the pressure balance of gas condensate reservoir experimental model entrance end, records the injected gas scale of construction;
(2) open core holding unit exit valve, carry out secondary simulation gas condensate reservoir step-down exhaustion recovery process, record the output of fluid in gas condensate reservoir experimental model pressure, effluent phase Characteristics and three phase separator;
(3) if gas condensate reservoir experimental model again retrograde condensate blockage occurs, above-mentioned steps (1) and (2) is repeated, until de-plugging completely.
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