CN110700821B - Offshore reservoir connectivity evaluation method and application thereof in reserve calculation - Google Patents
Offshore reservoir connectivity evaluation method and application thereof in reserve calculation Download PDFInfo
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- CN110700821B CN110700821B CN201911015182.9A CN201911015182A CN110700821B CN 110700821 B CN110700821 B CN 110700821B CN 201911015182 A CN201911015182 A CN 201911015182A CN 110700821 B CN110700821 B CN 110700821B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/06—Measuring temperature or pressure
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
- E21B49/001—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells specially adapted for underwater installations
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
- E21B49/08—Obtaining fluid samples or testing fluids, in boreholes or wells
- E21B49/087—Well testing, e.g. testing for reservoir productivity or formation parameters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A10/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE at coastal zones; at river basins
- Y02A10/40—Controlling or monitoring, e.g. of flood or hurricane; Forecasting, e.g. risk assessment or mapping
Abstract
The invention discloses an offshore reservoir connectivity evaluation method and application thereof in reserve calculation, wherein the offshore reservoir connectivity evaluation method comprises the following steps: s1, logging to obtain the positions of a first reservoir and a second reservoir which are adjacent to each other at intervals, the thickness of a mudstone layer between the first reservoir and the second reservoir and physical property characteristics; s2, setting the pumping probe in the first reservoir and setting the monitoring probe in the second reservoir; s3, the pumping probe carries out pump shaft and pressure recovery in the first reservoir, and the monitoring probe detects pressure change of the second reservoir in the second reservoir; and S4, judging connectivity between the first reservoir and the second reservoir according to the pressure change of the second reservoir detected by the monitoring probe. The offshore reservoir connectivity evaluation method provides a quick and reliable basis for offshore shallow reservoir vertical connectivity evaluation under the condition of complex well conditions, so that the uncertainty of reserve calculation is better reduced.
Description
Technical Field
The invention relates to the field of offshore reservoir evaluation, in particular to an offshore reservoir connectivity evaluation method and application thereof in reserve calculation.
Background
Reservoir vertical connectivity refers to the ability to flow vertically between multiple reservoirs in a reservoir. Typically, when a reservoir has multiple reservoirs, pressure profiling is performed using pressure measurements from formation testing. If the connectivity among the reservoirs is good, the pressure of each reservoir is on a pressure gradient line, no pressure gradient difference exists, the technology is generally applied to domestic and foreign oil fields, and the key in the application of the technology is to obtain high-quality pressure pretest data and accurate pressure gradient.
The prior patent CN104285034A discloses an evaluation method of reservoir connectivity in a hydrocarbon reservoir, which is used for evaluating connectivity among a plurality of parts in the hydrocarbon reservoir, and the specific method is as follows: collecting a plurality of hydrocarbon samples at corresponding different depths within a hydrocarbon reservoir; determining a plurality of actual heavy fraction concentrations of hydrocarbons at respective different depths using fluorescence intensities based on the plurality of hydrocarbon samples; determining a plurality of estimated heavy ends concentrations for the hydrocarbons at respective different depths; and comparing the plurality of actual heavy fraction concentrations of hydrocarbons to a plurality of estimated heavy fraction concentrations of hydrocarbons to assess connectivity between the plurality of portions of the hydrocarbon reservoir. The patent does not have applicability in offshore shallow heavy oil reservoirs, and for users, representative formation fluids are obtained first, and the bitumen content of the heavy oil is less than 1%, and the analysis method is applicable.
The two methods for evaluating the vertical connectivity explained above are influenced by underground and ground dual factors such as geological oil reservoirs, ocean environments and the like in the offshore oil field exploration and development environment, the faced problems are quite different from the land, especially in shallow oil reservoirs, the underground reservoir is very loose, irregular borehole diameter expansion and slurry filtrate invasion depth caused by slurry drilling cause great influence on the quality of data recorded in stratum testing, thereby bringing great uncertainty to pressure measurement and downhole fluid analysis, and having certain limitation.
Disclosure of Invention
The invention aims to solve the technical problem of providing an offshore reservoir connectivity evaluation method suitable for evaluating the vertical connectivity of a reservoir under the complex conditions of a well and a mine and application of the method in reserve calculation.
The technical scheme adopted by the invention for solving the technical problem is as follows: provided is an offshore reservoir connectivity evaluation method, which comprises the following steps:
s1, logging to obtain the positions of a first reservoir and a second reservoir which are adjacent to each other at intervals, the thickness of a mudstone layer between the first reservoir and the second reservoir and physical property characteristics;
s2, setting the pumping probe in the first reservoir and setting the monitoring probe in the second reservoir;
s3, the pumping probe carries out pump shaft and pressure recovery in the first reservoir, and the monitoring probe detects pressure change of the second reservoir in the second reservoir;
and S4, judging the connectivity between the first reservoir and the second reservoir according to the pressure change of the second reservoir detected by the monitoring probe.
Preferably, in step S4, when the pressure change of the second reservoir detected by the monitor probe is greater than 0.5psi, it is determined that the first reservoir and the second reservoir are connected; otherwise, it is not connected.
Preferably, in step S4, when the variation in pressure of the second reservoir detected by the monitor probe is greater than 0.5psi and the monitor probe responds by spherical flow or radial flow, it is determined that the first reservoir and the second reservoir are in communication; otherwise, the communication is not connected.
Preferably, the pumping probe and the monitoring probe are both connected with a main pump;
in the step S3, the pumping probe pumps in the first reservoir at a preset first flow and a preset second flow, and finally, the pumping is stopped for recovering, wherein the flow is zero;
in step S4, the sniffer probe detects pressure changes in the second reservoir.
Preferably, in step S1, the physical properties of the shale layer include porosity, permeability, and neutron density.
Preferably, in step S2, a separation distance between the pumping probe and the listening probe is set according to the thickness of the mudstone layer.
The invention also provides application of the offshore reservoir connectivity evaluation method in reserve calculation.
Preferably, when the first reservoir and the second reservoir which are adjacent at intervals up and down are communicated and an oil-water interface exists below the second reservoir, the reserves of the first reservoir and the second reservoir are calculated as the ascertained reserves.
Preferably, when the first reservoir and the second reservoir which are adjacent at the upper-lower interval are not communicated, and a water layer is arranged below the bottom of the second reservoir, and an oil-water interface exists between the second reservoir and the water layer, the reserve calculation of the first reservoir comprises the steps of ascertaining the reserve, extrapolating sand bodies of the first reservoir to obtain a control reserve, and calculating the reserve of the second reservoir as the ascertained reserve.
Preferably, when the first reservoir and the second reservoir which are adjacent at the upper-lower interval are not communicated and no oil-water interface exists below the second reservoir, the reserve calculation of the first reservoir and the second reservoir comprises the ascertained reserve and the controlled reserve.
According to the offshore reservoir connectivity evaluation method, the reservoir connectivity is evaluated by combining logging information and an interference test method of stratum test, and under the condition of complex well conditions, a quick and reliable basis is provided for vertical connectivity evaluation of an offshore shallow oil reservoir, so that the uncertainty of reserve calculation is better reduced; when a shallow reservoir and an underground reservoir are very loose, the quality of data recorded in stratum testing can be guaranteed when a borehole is irregular and mud filtrate is deeply invaded, and pressure measurement and underground fluid analysis can be determined, so that the vertical connectivity of the reservoir can be well evaluated. In the exploration phase, a data base can be provided for optimizing the reserve calculation scheme.
Drawings
The invention will be further described with reference to the following drawings and examples, in which:
FIG. 1 is a flow chart of a method for offshore reservoir connectivity evaluation in accordance with an embodiment of the present invention;
fig. 2 is a schematic cross-sectional structure diagram of a reservoir in the offshore reservoir connectivity evaluation method according to an embodiment of the invention.
Detailed Description
For a more clear understanding of the technical features, objects, and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
With reference to fig. 1 and 2, a method for evaluating connectivity of an offshore reservoir according to an embodiment of the present invention includes the following steps:
s1, logging to obtain the position of the first reservoir 10 and the second reservoir 20 which are adjacent to each other, the thickness of a mudstone layer 30 between the first reservoir 10 and the second reservoir 20 and physical property characteristics.
The logging means includes conventional logging means such as gamma, resistivity, neutron density and porosity, and the positions of reservoirs, such as the first reservoir 10 and the second reservoir 20 which are adjacent to each other, are known through data obtained through logging, and the thickness, physical property characteristics and the like of a mudstone layer 30 between every two reservoirs are obtained. Physical properties of the mudstone layer 30 include porosity, permeability, and neutron density, among others.
The separation distance between the pumping probe 10 and the listening probe 20, which are subsequently probed, is determined by the obtained thickness of the mudstone layer 30.
S2, setting the pumping probe 1 in the first reservoir 10, and setting the monitoring probe 2 in the second reservoir 20.
Wherein, the probe 1 of pumping and monitor probe 2 and all connect the main pump, and the separation distance between probe 1 of pumping and monitor probe 2 sets up according to the thickness of argillite layer 30, optional 2-7 meters. For example, for a thickness of 4-5m for mudstone 30, the separation distance between pumping probe 1 and sniffer probe 2 is set to be greater than the thickness, for example, 5m or more.
As shown in fig. 2, in this embodiment, a first reservoir 10 is located above a second reservoir 20, a pumping probe 1 penetrates into the first reservoir 10 located above, and a monitoring probe 2 penetrates into the second reservoir 20 located below. In an embodiment thereof, the first reservoir 10 may be located below the second reservoir 20, with the pumping probe 1 penetrating into the first reservoir 10 located below.
And S3, pumping the pump by the pumping probe 1 to pump the shaft and recover the pressure in the first reservoir 10, and detecting the pressure change of the second reservoir in the second reservoir 20 by the monitoring probe 2.
The pumping probe 1 performs pumping in the first reservoir at a first flow rate and a second flow rate which are preset, and finally stops pumping and recovering, wherein the flow rate is zero.
And S4, judging the connectivity between the first reservoir 10 and the second reservoir 20 according to the pressure change of the second reservoir 20 detected by the monitoring probe 2.
Wherein the monitor probe 2 detects pressure changes in the second reservoir 20.
When the pressure change of the second reservoir stratum 20 detected by the monitoring probe 2 is larger than 0.5psi, the first reservoir stratum 10 and the second reservoir stratum 20 are judged to be communicated; otherwise, it is not connected. Or when the pressure change of the second reservoir 20 detected by the monitor probe 2 is greater than 0.5psi and the monitor probe 2 responds by spherical flow or radial flow, the first reservoir 10 and the second reservoir 20 are judged to be communicated; otherwise, it is not connected.
The offshore reservoir connectivity evaluation method can successfully confirm the connectivity of the reservoir, not only provides support for optimizing reserve calculation, but also provides data information for future development and design schemes from an early stage.
The application of the offshore reservoir connectivity evaluation method in reserve calculation determines the reserve calculation through the evaluation of connectivity.
Referring to fig. 2, with the first reservoir 10 above and the second reservoir 20 below, connectivity of the two reservoirs is obtained by the connectivity evaluation method described above. Wherein:
when the first reservoir 10 and the second reservoir 20 which are adjacent at intervals up and down are communicated and an oil-water interface exists below the second reservoir 20, the reserves of the first reservoir 10 and the second reservoir 20 are calculated as the ascertained reserves.
When the first reservoir 10 and the second reservoir 20 which are adjacent at intervals up and down are not communicated, a water layer is arranged below the bottom of the second reservoir 20, and an oil-water interface exists between the second reservoir 20 and the water layer, the reserve calculation of the first reservoir 10 comprises the steps of ascertaining the reserve, extrapolating sand bodies of the first reservoir 20 to obtain a control reserve, and calculating the reserve of the second reservoir 20 as the ascertained reserve.
When the first reservoir 10 and the second reservoir 20 which are adjacent at intervals up and down are not communicated and an oil-water interface does not exist below the second reservoir 20, the reserve calculation of the first reservoir 10 and the second reservoir 20 comprises the exploration reserve and the control reserve.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (8)
1. An offshore reservoir connectivity evaluation method is characterized by comprising the following steps:
s1, logging to obtain the positions of a first reservoir and a second reservoir which are adjacent to each other at intervals, the thickness of a mudstone layer between the first reservoir and the second reservoir and physical property characteristics;
s2, setting a pumping probe in the first reservoir and connecting the pumping probe with a main pump, and setting a monitoring probe in the second reservoir;
s3, the pumping probe performs pumping and pressure recovery in the first reservoir, and the monitoring probe detects pressure change of the second reservoir in the second reservoir;
s4, judging connectivity between the first reservoir and the second reservoir according to the pressure change of the second reservoir detected by the monitoring probe;
when a first reservoir and a second reservoir which are adjacent at an upper interval and a lower interval are not communicated, a water layer is arranged below the bottom of the second reservoir, and an oil-water interface exists between the second reservoir and the water layer, calculating the reserve of the first reservoir by finding the reserve, extrapolating sand bodies of the first reservoir to obtain a controlled reserve, and calculating the reserve of the second reservoir as the found reserve;
when the first reservoir and the second reservoir which are adjacent at intervals up and down are not communicated and an oil-water interface does not exist below the second reservoir, calculating the reserves of the first reservoir and the second reservoir comprises ascertaining the reserves and controlling the reserves.
2. An offshore reservoir connectivity evaluation method according to claim 1, wherein in step S4, when the pressure variation of the second reservoir detected by the monitor probe is greater than 0.5psi, it is determined that the first reservoir and the second reservoir are in communication; otherwise, it is not connected.
3. An offshore reservoir connectivity evaluation method according to claim 1, wherein in step S4, when the variation in pressure of the second reservoir detected by the monitor probe is greater than 0.5psi, and the monitor probe responds by spherical flow or radial flow, it is determined that the first reservoir and the second reservoir are in communication; otherwise, the communication is not connected.
4. The offshore reservoir connectivity evaluation method of claim 1, wherein the pumping probe and the monitoring probe are both connected with a main pump;
in the step S3, the pumping probe pumps in the first reservoir at a preset first flow and a preset second flow, and finally, the pumping is stopped for recovering, wherein the flow is zero;
in step S4, the sniffer probe detects pressure changes in the second reservoir.
5. An offshore reservoir connectivity evaluation method according to claim 1, wherein in step S1, the physical characteristics of the shale layer include porosity, permeability and neutron density.
6. Offshore reservoir connectivity evaluation method according to claim 1, wherein in step S2, the separation distance between the pumping probe and the listening probe is set according to the thickness of the mudstone layer.
7. Use of the offshore reservoir connectivity evaluation method of any one of claims 1 to 6 for reserve calculation.
8. Use of the offshore reservoir connectivity evaluation method in reserve calculation according to claim 7, wherein when a first reservoir and a second reservoir which are adjacent to each other at an upper-lower interval are communicated with each other and an oil-water interface exists below the second reservoir, the reserves of the first reservoir and the second reservoir are calculated as the ascertained reserves.
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| CN115078599A (en) * | 2021-03-10 | 2022-09-20 | 中国石油化工股份有限公司 | Reservoir connectivity evaluation method based on crude oil full-component concentration |
| CN115822562B (en) * | 2022-12-28 | 2023-07-11 | 中海石油(中国)有限公司海南分公司 | Longitudinal heterogeneous gas reservoir productivity evaluation method considering in-situ channeling |
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