CN210948653U - Device for rapidly evaluating shale gas well productivity - Google Patents
Device for rapidly evaluating shale gas well productivity Download PDFInfo
- Publication number
- CN210948653U CN210948653U CN201921865119.XU CN201921865119U CN210948653U CN 210948653 U CN210948653 U CN 210948653U CN 201921865119 U CN201921865119 U CN 201921865119U CN 210948653 U CN210948653 U CN 210948653U
- Authority
- CN
- China
- Prior art keywords
- gas
- core
- methane
- saturation tank
- shale
- 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.)
- Active
Links
Images
Abstract
The utility model discloses a device of quick evaluation shale gas well productivity, heater block parcel rock core gas saturation jar sets up, methane cylinder is connected the setting with the rock core gas saturation jar, temperature acquisition control unit is connected with the rock core gas saturation jar, the vacuum pump, gas collection part and pressure acquisition part pass through the cross valve and are connected the setting, temperature acquisition control unit, pressure acquisition part, gas flowmeter is connected with control terminal respectively, gas flowmeter sets up on the connecting tube of rock core gas saturation jar and gas collection part, the oxidation pond links to each other with the gas collection part, isotope ratio spectral determination device links to each other with the oxidation pond. The utility model discloses can furthest's the warm-pressing condition of simulation shale gas well on-the-spot development in-process, ensure that desorption in-process methane gas's change can both be read in real time and the record, avoid the operation error, possess the flexibility of operation and the advantage on the data modeling.
Description
Technical Field
The utility model relates to an unconventional oil gas exploration and development technical field especially relates to a device of quick evaluation shale gas well productivity.
Background
The productivity evaluation of shale gas wells is divided into field evaluation and laboratory evaluation, and the methods comprise gas desorption quantity and isotope relative change. Isotope monitoring evaluates energy production primarily through the change in isotope values caused by fractionation of carbon isotopes during shale gas well production. Isotope on-site capacity monitoring adopts the mode of on-site sampling, often the time cycle is longer, receives the influence of production activity great to produce uncontrollable risks such as isotope fractionation easily among the artificial sampling process, therefore data fluctuation is great relatively, and easily miss some important time quantum of adopting. The sample that isotope laboratory simulation productivity detected adopts rock core or detritus sample, and artificial filling methane gas simulates the occurrence state of methane in actual stratum, because the sample size is less relatively, has possessed that test time is fast, test data point is many, the variable controllable advantage of test condition compared the mode of on-the-spot sampling. The method and the laboratory device developed by the predecessor mostly adopt the modes of sampling and sample measurement separation, a drainage gas collection method is adopted for collecting gas samples, mass spectrometry is used for analysis and measurement, in the process of filling methane in a rock core, part of devices do not heat the rock core, the temperature is an important influence factor for the adsorption of methane in shale, part of devices adopt rock debris for measurement, the adsorption specific surface area is increased after crushing, the fractionation caused by adsorption and desorption is enhanced, the fractionation caused by seepage action of methane in the pore of the rock core is weakened, the actual state is not as good as the representation of the composite actual condition of the rock core column, so the carbon isotope fractionation adopted by the laboratory must also consider the factors of the temperature and the sample size.
Due to the factors, the difference between the method for simulating the carbon isotope data in the production process of the shale gas well in the laboratory and the real recovery condition can restrict the productivity evaluation of the shale gas well to a certain extent. Therefore, a method and equipment matched with the method for rapidly and reasonably evaluating the shale gas well productivity are needed.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the main technical problem who solves provides a device of quick evaluation shale gas well productivity, and application effect is good.
In order to solve the technical problem, the utility model discloses a technical scheme be: the device for rapidly evaluating the productivity of the shale gas well comprises a core gas pressure saturation tank, a heating part, a methane gas cylinder, a temperature acquisition control part, a vacuum pump, a gas collection part, a pressure acquisition part, a four-way valve, a control terminal, a gas flowmeter, an oxidation pond and an isotope ratio spectrum measuring device, wherein the core gas pressure saturation tank is wrapped by the heating part, the methane gas cylinder is connected with the core gas pressure saturation tank, the temperature acquisition control part is connected with the core gas pressure saturation tank, the vacuum pump, the gas collection part and the pressure acquisition part are connected through the four-way valve, the temperature acquisition control part, the pressure acquisition part and the gas flowmeter are respectively connected with the control terminal, the gas flowmeter is arranged on a connecting pipeline of the core gas pressure saturation tank and the gas collection part, the oxidation pond is connected with the gas collecting part, and the isotope ratio spectrum measuring device is connected with the oxidation pond.
In a preferred embodiment of the present invention, the core gas saturation tank is a split type, and the core gas saturation tank includes a first quick-release type joint, a core gas saturation tank body and a second quick-release type joint, and the first quick-release type joint and the second quick-release type joint are respectively located above and below the core gas saturation tank body.
In a preferred embodiment of the present invention, the temperature acquisition control unit is connected to the core gas pressure saturation tank by a card.
In a preferred embodiment of the present invention, the gas collecting member includes a push-pull rod, a piston, and a barrel, the piston plugs the barrel, and the push-pull rod is connected to the piston.
In a preferred embodiment of the present invention, the barrel is provided with a scale.
The utility model has the advantages that: the utility model discloses a device of quick evaluation shale gas well productivity, the warm-pressing condition in the on-the-spot development process of simulation shale gas well that can furthest ensures that desorption in-process methane gas's change can both be read in real time and the record, avoids the operation error, possesses the flexibility of operation and the advantage on the data modeling.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained without inventive work, wherein:
fig. 1 is a schematic structural diagram of a preferred embodiment of the device for rapidly evaluating the productivity of the shale gas well according to the present invention;
FIG. 2 is a graph showing the time-dependent isotope variation and gas production rate variation to be experimentally obtained in the present invention;
fig. 3 is a flowchart illustrating a method for rapidly evaluating shale gas well productivity according to a preferred embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely below, and it should be apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
Referring to fig. 3, a method for rapidly evaluating shale gas well productivity is provided, which includes the steps of:
(1) performing methane filling on a shale core sample of a shale gas well, wherein the methane filling is performed at a certain temperature and pressure, specifically, the formation temperature gradient is 3.5 ℃/100m, the depth of the shale gas layer is 1700m-3000m at present, and the temperature range is as follows: 25-110 ℃ and the pressure is about 20 Mpa; (2) continuously monitoring methane carbon isotopes in the shale core desorption process to obtain a change curve of the methane carbon isotopes along with time and a change curve of desorption gas amount along with time; (3) comparing and modeling the change curve of the methane carbon isotope obtained in the step (2) along with time with the change curve of the methane stable carbon isotope acquired in the oilfield on-site isotope logging work along with time and the gas production rate to obtain a conversion coefficient of the gas production rate; (4) according to a time-varying curve of the methane stable carbon isotope collected in the oilfield on-site isotope logging work, the single-well production energy and the order in development are determined, and the predicted residual gas content and the time for stable production are calculated.
The continuous monitoring in step (2) can continuously record the change of the methane carbon isotope in the shale desorption process, and avoid the error caused by separation between the methane gas collection and the test. The continuous measurement not only comprises the measurement of carbon isotopes in the process of core desorption, but also comprises the measurement of the amount of desorbed gas in the desorption process.
The modeling in the step (3) can be in various modes, for example, based on comparison of isotope change curves along with time, a conversion coefficient between laboratory time and oilfield field development time is quickly obtained according to a stretching ratio of horizontal axis time; or the time conversion coefficient obtained by converting the sampling curve into the differential curve and comparing the sampling curve with the differential curve through calculation. The method specifically comprises the following steps: and (3) amplifying the time scale of the change curve of the methane carbon isotope with time obtained in the step (2) to the time scale of oilfield field development to obtain a conversion coefficient between the time of the change curve of the methane carbon isotope with time obtained in the step (2) and the time of oilfield field development, and performing correlation matching on the change curve of the desorption gas quantity with time obtained in the step (2) and the actual gas production curve of the oilfield field to obtain the conversion coefficient of the gas production.
Referring to fig. 1, a device for rapidly evaluating the productivity of a shale gas well is provided, which comprises a core gas pressure saturation tank 1, a heating part 2, a methane gas cylinder 3, a temperature acquisition control part 4, a vacuum pump 5, a gas collection part 6, a pressure acquisition part 7, a four-way valve 8, a control terminal 9, a gas flowmeter 10, an oxidation pond 11 and an isotope ratio spectrum measuring device 12, wherein the core gas pressure saturation tank 1 is wrapped by the heating part 2, the methane gas cylinder 3 is connected with the core gas pressure saturation tank 1, the temperature acquisition control part 4 is connected with the core gas pressure saturation tank 1, the vacuum pump 5, the gas collection part 6 and the pressure acquisition part 7 are connected through the four-way valve 8, the temperature acquisition control part 4, the pressure acquisition part 7 and the gas flowmeter 10 are respectively connected with the control terminal 9, the gas flowmeter 10 is arranged on a connecting pipeline of the core gas saturation tank 1 and the gas collecting part 6, the oxidation pond 11 is connected with the gas collecting part 6, and the isotope ratio spectrum measuring device 12 is connected with the oxidation pond 11.
The core gas saturation tank 1 is arranged in a split mode, the core gas saturation tank 1 comprises a first quick-release type connector 13, a core gas saturation tank body 14 and a second quick-release type connector 15, and the first quick-release type connector and the second quick-release type connector are located above and below the core gas saturation tank body respectively. The core gas saturated pressure tank body, the first quick-release type joint and the second quick-release type joint are arranged in a sealing mode through threads and rubber sealing rings.
The gas collecting component 6 comprises a push-pull rod 16, a piston 17 and a cylinder body 18, the piston 17 plugs the cylinder body, and the push-pull rod is connected with the piston. The cylinder body is provided with scales. The gas collection part 6 is provided with a constant gas sample introduction module, and constant gas sample introduction is realized by controlling the opening and closing of a push-pull rod, a V3 valve and a V4 valve through a control terminal according to the collected data of a front end gas flowmeter and battery valves at the front end and the rear end of the cylinder body.
The working process of the device for rapidly evaluating the shale gas well productivity comprises the following steps:
(1) and taking a shale core sample of a target interval of the shale gas production well with isotope logging data in the oil field site, wherein the isotope logging data refer to a variation curve of a methane stable carbon isotope acquired in the isotope logging work in the oil field site along with time and gas production.
(2) The shale core sample is made into a sample with the specification of 25mm x 60mm, dried to constant weight at 60 ℃, and then placed into a core gas pressure saturation tank 1 for a methane carbon isotope fractionation continuous monitoring experiment of the shale core sample.
(3) And a pressure regulating valve 19, a gas cylinder connecting switch 20 and a V1 valve 21 are sequentially arranged on a connecting pipeline of the methane gas cylinder and the core gas saturated pressure tank. And opening the gas cylinder connecting switch 20, opening the methane gas cylinder, adjusting the pressure regulating valve, and exhausting air in a connecting pipeline between the methane gas cylinder and the core gas saturated pressure tank by using reference methane gas in the methane gas cylinder.
(4) The temperature acquisition control part is connected with the core gas pressure saturation tank by a card-inserted electric connector, and is a product sold on the market. The temperature acquisition control part can acquire the temperature in the core gas pressure saturation tank and can control the temperature in the core gas pressure saturation tank.
(5) And opening a V2 valve 22, a V3 valve 23 and a V5 valve 24 to communicate the core gas pressure saturation tank, the vacuum pump and the gas collecting component, and vacuumizing the core gas pressure saturation tank and the gas collecting component, so that the influence of air on an isotope test value can be avoided.
(6) Closing the V2 valve 22, the V3 valve 23 and the V5 valve 24, opening the V1 valve 21 and the gas cylinder connecting switch 20, filling the reference methane gas in the methane gas cylinder into the shale core sample in the core gas saturated pressure tank, and controlling the filling pressure by using a pressure regulating valve.
(7) And controlling the temperature of the core gas saturated pressure tank during filling by adopting a temperature acquisition control part, wherein the purpose of controlling the temperature is to simulate the maximum gas content of the core under the formation temperature condition.
(8) After the methane gas is filled under the given temperature and pressure conditions, the V1 valve and the gas cylinder connecting switch 20 are closed, the V2 valve is opened, the methane pressure escaping from the rock core gas saturated pressure tank is collected through a pressure collecting component, namely a gas pressure sensing device, and pressure data are recorded on a control terminal. The control terminal is a commercially available product. The control terminal can be a computer, data collected by the pressure sensor can be displayed and recorded on the control terminal through a serial port, the temperature can be recorded, isotope spectrum data collection software is installed to control the isotope spectrum data collection, and the recording and the processing can be realized in the prior art.
(9) The gas flowmeter is connected with the control terminal and records the volume of the passing methane by adopting an accumulation mode.
(10) Methane gas enters the gas collecting part through the gas flowmeter. The V3 valve was set to equal volume intervals of Aml open based on collected cumulative methane volume data, with the V4 valve 25 closed upon opening of the V3 valve. Because the sample feeding rod of the gas collecting part has certain weight and can block the low-pressure trace gas from entering, the design of a push-pull rod is adopted. The push-pull rod is commercially available at present, the push-pull rod is a 12V direct current electric push-pull rod reciprocating motor, the maximum stroke is 100mm, the lower end of the push-pull rod is of an injector-like structure, and the push-pull rod is connected with a push rod of an injector to realize the function of suction. The model can refer to a model of dragon flying (hardware) stepping 100mm, but is not limited to the model.
(11) The push-pull rod is connected with a push-pull rod braking part 26, scales are arranged on the cylinder body, and the height of the push-pull rod is adjusted according to the scales on the cylinder body, so that gas collection with fixed volume is realized.
(12) When the push-pull rod sucks Aml methane gas into the cylinder, the V3 valve is closed, the V4 valve is opened, and the push-pull rod brake component controls the push-pull rod to realize sample injection.
(13) The methane gas passes through a high-temperature oxidation pond, the temperature of the oxidation pond is set to 850 ℃, so that the methane is converted into carbon dioxide.
(14) The method is characterized in that the change of methane carbon isotopes in shale along with desorption time and desorption gas volume in the development process of the shale gas well is simulated in a laboratory, carbon dioxide converted by an oxidation pond in a continuous sample introduction mode enters an isotope ratio spectrum measuring device to be measured for carbon isotopes, and test results are recorded at a control terminal, so that the development condition of an oil field site is simulated to the maximum extent. A change curve of the methane carbon isotope with time and a change curve of the desorption gas amount with time under the condition of a certain initial saturated methane pressure and a given temperature are obtained, and refer to fig. 2 specifically.
(15) The method comprises the steps of dividing a change curve of a methane carbon isotope with time and a change curve of desorption gas with time into a high-yield rapid decreasing section, a stable-yield section and a depletion section according to slopes, wherein the high-yield rapid decreasing section, the stable-yield section and the depletion section correspond to the stages of the shale gas well in the oil field in the production development process respectively.
(16) Comparing the change curve of the methane carbon isotope with time and the change curve of the desorbed gas quantity with time, which are obtained in the step (14) in a laboratory, with the change curves of the methane stable carbon isotope with time and the gas production quantity, which are acquired in the oil field on-site isotope logging work;
(17) the modeling mode adopts a data curve comparison mode. Adjusting the vertical coordinate interval of the change curve of the methane carbon isotope with time obtained in the step (14) to be consistent with the monitoring curve of the oil field site, amplifying the horizontal coordinate of the change curve of the methane carbon isotope with time obtained in the step (14) of the laboratory, aligning the data starting point of the curve, obtaining the conversion coefficient between the time of the change curve of the methane carbon isotope with time obtained in the step (14) and the time of the oil field site development according to the overlapping degree, and amplifying the time scale of the core experiment of the laboratory, which is measured in hours, to the measurement of the oil field site, which is measured in days or years.
(18) According to a curve of the variation of the stable carbon isotope of methane along with time, which is acquired in the field isotope logging work of the oil field, of the carbon isotope of methane, single-well methane and carbon isotopes of other shale gas wells in the work area are compared with laboratory fractionation experimental data of isotopes of rock cores in the same layer of the same well, so that the single-well productivity and the stage in development are obtained, the predicted residual gas content and the time for stable production are calculated, and the development of the shale gas wells in the work area is guided.
The embodiment of the utility model provides a device that detects methane carbon isotope in succession in simulation shale gas well development process changes, based on the principle of isotope fractionation, simulation shale gas well development environment, the change curve of methane carbon isotope in the monitoring development process along with time combines the data of actual producing well, provides a method of the productivity of quick evaluation shale gas well.
Compared with the prior method and device, the method and device provided by the utility model can simulate the temperature and pressure conditions of the shale gas well in the field development process to the maximum extent under the laboratory scale; the whole equipment does not have the process of artificially transferring gas, and can ensure that the change of methane gas in the desorption process can be read and recorded in real time; continuous constant sample introduction can avoid operation errors caused by gas collection by a drainage method.
The utility model discloses can obtain shale gas well methane a large amount of data along with time change under different warm-pressing conditions through the short rock core experiment of time and intensive sampling point, compare the longer well site monitoring data of time, possess the flexibility of operation and the advantage on the data modeling.
The above only is the embodiment of the present invention, not limiting the patent scope of the present invention, all of which utilize the equivalent structure or equivalent flow transformation made by the content of the specification of the present invention, or directly or indirectly applied to other related technical fields, all included in the same way in the patent protection scope of the present invention.
Claims (5)
1. The device for quickly evaluating the productivity of the shale gas well is characterized by comprising a core gas pressure saturation tank, a heating component, a methane gas cylinder, a temperature acquisition control component, a vacuum pump, a gas collection component, a pressure acquisition component, a four-way valve, a control terminal, a gas flowmeter, an oxidation pond and an isotope ratio spectrum measuring device, wherein the heating component wraps the core gas pressure saturation tank, the methane gas cylinder is connected with the core gas pressure saturation tank, the temperature acquisition control component is connected with the core gas pressure saturation tank, the vacuum pump, the gas collection component and the pressure acquisition component are connected through the four-way valve, the temperature acquisition control component, the pressure acquisition component and the gas flowmeter are respectively connected with the control terminal, the gas flowmeter is arranged on a connecting pipeline of the core gas pressure saturation tank and the gas collection component, the oxidation pond is connected with the gas collecting part, and the isotope ratio spectrum measuring device is connected with the oxidation pond.
2. The device for rapidly evaluating productivity of a shale gas well as defined in claim 1 is characterized in that the core gas saturation tank is separately arranged, the core gas saturation tank comprises a first quick-release connector, a core gas saturation tank body and a second quick-release connector, and the first quick-release connector and the second quick-release connector are respectively positioned above and below the core gas saturation tank body.
3. The device for rapidly evaluating the productivity of a shale gas well as defined in claim 1 wherein the temperature acquisition control component is connected with the core gas saturation tank in a card-inserting manner.
4. The device for rapidly evaluating the productivity of a shale gas well as defined in claim 1 wherein the gas collection component comprises a push-pull rod, a piston and a barrel, the piston plugs the barrel, and the push-pull rod is connected with the piston.
5. The device for rapidly evaluating the productivity of a shale gas well as defined in claim 4 wherein the barrel is provided with a scale.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921865119.XU CN210948653U (en) | 2019-11-01 | 2019-11-01 | Device for rapidly evaluating shale gas well productivity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921865119.XU CN210948653U (en) | 2019-11-01 | 2019-11-01 | Device for rapidly evaluating shale gas well productivity |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210948653U true CN210948653U (en) | 2020-07-07 |
Family
ID=71376235
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921865119.XU Active CN210948653U (en) | 2019-11-01 | 2019-11-01 | Device for rapidly evaluating shale gas well productivity |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210948653U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112285193A (en) * | 2020-10-19 | 2021-01-29 | 中国科学院长春应用化学研究所 | Battery mass spectrum sampling system |
| CN114112787A (en) * | 2020-09-01 | 2022-03-01 | 中国石油化工股份有限公司 | Method for identifying shale gas sweet spot sections of single well |
-
2019
- 2019-11-01 CN CN201921865119.XU patent/CN210948653U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114112787A (en) * | 2020-09-01 | 2022-03-01 | 中国石油化工股份有限公司 | Method for identifying shale gas sweet spot sections of single well |
| CN112285193A (en) * | 2020-10-19 | 2021-01-29 | 中国科学院长春应用化学研究所 | Battery mass spectrum sampling system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103452547B (en) | The analysis and processing method of afterflow data and system in well test data | |
| CN106596380B (en) | Shale staged fracturing horizontal well fracturing fluid flowback capability evaluation method and device | |
| CN102374963B (en) | Test device for evaluating well completion manner of coal bed methane | |
| CN109826621B (en) | Coal bed gas multilayer combined gas-water two-phase seepage experimental device and test method | |
| CN102953726B (en) | Method and device for water drive oilfield advantage channel recognition | |
| Li et al. | Evaluation and modeling of gas permeability changes in anthracite coals | |
| CN111257202A (en) | Shale fracturing fluid forced imbibition and flowback experimental method under condition of containing adsorbed gas | |
| CN106383221B (en) | A kind of reservoir stress sensitive experiment test method and device | |
| CN110672813B (en) | Shale gas content calculation method | |
| CN104390883A (en) | Novel adsorption and desorption experiment device and novel adsorption and desorption experiment method | |
| CN102608011B (en) | Method for determining and building bound water for crack-pore (hole) type reservoir core | |
| CN106680451A (en) | Underground rapid measurement method for coal and gas outburst parameter as well as apparatus thereof | |
| CN210948653U (en) | Device for rapidly evaluating shale gas well productivity | |
| CN103454399A (en) | Simulation experiment device and method for hot-press hydrocarbon generation and discharge based on basin evolution history | |
| CN108844850A (en) | Shale adsorption-desorption and decompression exploitation simulator and method based on dynamic equilibrium | |
| CN106066291A (en) | CO2displacement shale gas and shale are to shale gas or CO2absorption analytic simulation test System and method for | |
| CN104632153B (en) | Experiment system for water reciprocating movement law of water drive oil and gas reservoir type gas storage | |
| CN107345890B (en) | Shale gas adsorption desorption/exploitation simulation experiment device and method | |
| CN112964597B (en) | Multi-scale rock core adsorption-analysis-exploitation simulation experiment device and method | |
| CN110685678A (en) | Method and device for rapidly evaluating shale gas well productivity | |
| CN105651912A (en) | Rock pyrologger and pyrolytic analysis method | |
| CN108732061A (en) | Stripping gas and free gas recognition methods in a kind of shale gas output gas | |
| CN106640042A (en) | Device and method for evaluating single well productivity of gas well | |
| CN205719852U (en) | CO2displacement shale gas and shale are to shale gas or CO2absorption analytic simulation test device | |
| CN103114851B (en) | Different cranny development coal seams aerogenesis contribution capacity of water testing arrangement |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |