CN111677491A - Method for selecting and evaluating logging horizon of pilot production horizon of development well - Google Patents
Method for selecting and evaluating logging horizon of pilot production horizon of development well Download PDFInfo
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- 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
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Abstract
The invention provides a method for evaluating logging and selecting layers of a test-production layer of a development well, which comprises the following steps: step 1, performing lithology identification on a sample, and judging the lithology of a reservoir; step 2, evaluating microscopic characteristics of the reservoir and judging the type of the reservoir; step 3, evaluating the oil content of the reservoir to judge the oil content of the reservoir; step 4, comprehensively evaluating the fluid properties of the reservoir and judging the fluid properties of the reservoir; and 5, according to the evaluation conclusion of the steps (2) to (4), proposing a trial mining horizon suggestion and a reference suggestion of later development, and providing a basis for formulation of next working measures and compilation of a development scheme. The method can determine a good oil layer from a plurality of thin interbed layers, low-hole and low-permeability layers and low-resistivity difficult layers, and further provides a basis for later-stage development, production and layer selection, improves development benefits, and has a wide application prospect.
Description
Technical Field
The invention relates to the technical field of oilfield development, in particular to a rolling exploration well and an oil reservoir evaluation well, and relates to a method for determining a trial production horizon of a development well.
Background
When the development of the oil field enters the middle and later stages, the oil-water relationship is complex, and the oil reservoir storage and percolation characteristics can be more accurately known only by deeply knowing the current pore structure, gap filler and oil-water distribution characteristics of the reservoir, so that the main factors influencing the fluid storage and output are determined, thereby taking effective measures to exert the potential of the oil-gas reservoir to the maximum extent and improving the oil-gas recovery ratio. In addition, when a target stratum system is drilled with a plurality of oil-containing stratum systems, how to accurately judge and identify a value layer from a plurality of thin interbed layers, low-hole low-permeability layers and low-resistance difficult layers is the most concerned problem in oilfield development, and is an effective method for improving development benefits.
Logging and logging technologies can evaluate the fluid properties of the reservoir. At present, in a development well, the evaluation of the fluid property of a hydrocarbon reservoir mainly depends on logging information, but the development well logging technology series widely applied in the development of oil fields is difficult to evaluate the microscopic characteristics of the reservoir, such as the mineral composition of the reservoir, the pore throat characteristic, the distribution state of fluid in pores and the like.
Logging can analyze and test rock debris, rock cores and side-wall coring samples in the drilling process, and further reservoir evaluation and fluid property comprehensive evaluation are carried out. Therefore, the invention provides a method for carrying out stratum selection evaluation in a development well by utilizing a logging technology, which aims to solve the technical problems that the properties of crude oil are difficult to determine, the distribution of reservoir micro fluid is not clear, the trial production horizon is difficult to determine and the like in the conventional development well, and make up for the defects of the prior evaluation technology in the knowledge of the micro reservoir characteristics and the fluid properties of the development well.
Disclosure of Invention
The invention aims to provide a logging method for developing well stratum selection evaluation through fine evaluation of the microscopic characteristics of a target well reservoir and the properties of reservoir fluid, so that a value stratum is preferably selected for trial production development, and the development benefit is improved.
The object of the invention can be achieved by the following technical measures: the invention relates to a method for evaluating and logging a selected layer of a development well, which analyzes and identifies the lithology of a reservoir through rock ore and X-diffraction whole rock minerals; determining the physical property and pore structure of the reservoir through nuclear magnetic resonance logging and fluorescent sheet analysis; determining the connectivity and the micro-fluid distribution state of the reservoir through fluorescent sheet analysis; determining crude oil properties and hydrocarbon abundance of the reservoir by pyrolysis localization, quantitative fluorescence and thermal evaporation hydrocarbon analysis; and finally, comprehensively evaluating the fluid property of the reservoir layer of the target well according to the comprehensive analysis of the reservoir performance and the oil content of the reservoir layer, and providing a trial production horizon suggestion.
The invention has the following effective effects: the logging analysis and assay parameters of development well rock debris, a rock core or a borehole wall coring sample are utilized to analyze the micro-pore characteristics of a reservoir stratum, and a good oil layer is determined from a plurality of thin interbed layers, low-pore low-permeability layers and low-resistivity layers, so that the method for performing layer selection evaluation in the development well by utilizing the logging technology is formed. The method improves the utilization rate of rock debris of the development well and core taking of the well wall, provides reference basis for development, production and reservoir selection and protection of an oil-gas reservoir, and better meets the requirement of the oil field on promotion of comprehensive development benefits.
Drawings
FIG. 1 is a nuclear magnetic resonance logging T of the present invention2Fitting graph and T2A distribution curve;
FIG. 2 is a flow chart of an embodiment of a method of evaluating a selected interval of a development well of the present invention;
FIG. 3 is a chart of a thermally vaporized hydrocarbon spectrum in an embodiment of the invention;
FIG. 4 is an image of a fluorescent sheet in an embodiment of the present invention;
fig. 5 is a composite view of the evaluation logging of the selected layer of the development well in an embodiment of the invention.
Detailed Description
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
As shown in fig. 2, fig. 2 is a flow chart of the development well selection evaluation method of the present invention.
In the step (1), the target well sample is analyzed by utilizing rock and ore identification and X-ray diffraction whole rock mineral analysis, and the lithology of the reservoir is identified. The evaluation depth of the target well is 1498.70 m-1517.30 m, and the horizon is a ceramic group. The rock and ore analysis shows that the lithology of the target well K x-203 is clastic rock, and the rock is named as argillaceous medium-fine-grained sandstone, argillaceous fine sandstone and the like. The composition and content of sandstone are obtained by utilizing X-ray diffraction whole rock mineral analysis, the reservoir layer of the section takes quartz as the main component (the average content is 54.0 percent), feldspar as the secondary component (the average content is 27.6 percent), clay mineral content is 8-14 percent, and the composition mainly comprises a water-sensitive mineral illite-montmorillonite mixed layer, occasional dolomite and anhydrite. The flow proceeds to step (2).
In step (2), evaluation of the reservoir microscopic features is performed. The well was subjected to conventional side-wall coring, with evaluation of reservoir characteristics using a fluorescent sheet. The pores of the section of rock are communicated into pieces, the particles are fine, the grade is fine sand grade or silt grade, and orange asphaltene is distributed in the pores of the rock in a bound or semi-bound state. The flow proceeds to step (3).
In step (3), reservoir oiliness evaluation is performed. And carrying out pyrolysis and localization, thermal hydrocarbon evaporation and quantitative fluorescence analysis on the sample, and evaluating the oil-gas abundance and crude oil property of the reservoir according to the analysis result. According to the stage of pyrolysis, the light-weight ratio index PS0.89 to 1.12, an oiliness index R of 3.40 to 3.87, a main peak carbon nC28-nC31The spectrum shape is a rear peak type, the base line is seriously bulged, as shown in figure 4, the crude oil property is evaluated to be heavy oil, and the crude oil density is predicted to be 0.96g/cm3～0.98g/cm3In the meantime. The pyrogenation Pg is between 24.1mg/g and 29.55mg/g, the pyrogenation oil saturation So is between 16.5 percent and 24.44 percent, the quantitative fluorescence oil-containing level is between 10.2 and 10.7, the fluorescent thin sheet pores emit brighter yellow, yellow-green, green and orange fluorescence, the light emission is more uniform, the light-emitting area is between 40 percent and 60 percent, and the medium oil-containing gas abundance is evaluated according to the standard of the table 2. The step proceeds to step (4).
And (4) comprehensively evaluating the fluid property of the reservoir layer of the target well according to the pilot production data and the adjacent well comparison of the adjacent well and the analysis results of the micro-pore characteristics and the oil-gas abundance of the reservoir layer in the steps 4 and 5. The well is a homogeneous reservoir, the abundance of the oil gas is moderate, the pyrolysis localization shows that the abundance of the oil gas is reduced from top to bottom, and the physical property is positively correlated with the abundance of the oil gas. Testing and producing 6.3t of daily oil in equivalent interval of K + 204 wells of an adjacent well, containing 86 percent of water and having the relative density of crude oil of 0.9514g/cm3The layer is the same as oil and water. The pyrogenation Pg is between 35.45mg/g and 36.66mg/g, the pyrogenation oil saturation is between 23.3 percent and 24.15 percent, the quantitative fluorescence oil content is between 10.4 and 10.9, and the comparison shows that the oil-gas abundance of the target well is lower than that of the adjacent well. Observed under a fluorescent sheet mirror, the pores emit brighter yellow, yellow-green, green and orange fluorescence, the luminescence is more uniform, the bright yellow-green fluorescence in the pores is emulsified, the pores are brown,the water-containing trace has the trend of more obvious water-containing trace from top to bottom. The oil-water layer 14.5m/2 layer was explained according to the explanation criteria of Table 3. A comprehensive diagram for evaluating and logging in a selected layer is compiled by utilizing parameters such as pyrolysis and localization, quantitative fluorescence, X-ray diffraction whole rock mineral analysis and the like, and is shown in figure 3. The flow proceeds to step (5).
And (5) proposing a trial production horizon suggestion according to the reservoir evaluation result and the fluid property comprehensive evaluation result. The target well target layer explains 2 layers of oil-water layers, the top layer 1 well section 1498.7 m-1505.4 m is reduced in oil-containing abundance from top to bottom, water content is increased, according to the result of fluid property analysis, oil testing is recommended to be carried out on the top 2.3m of the section, and the section with obviously increased water content at the bottom is avoided. The crude oil of the target well is heavy oil and common thick oil, so that thermal recovery is not needed, and a conventional cold recovery mode is recommended. The clay mineral type is illite smectite mixed layer, which easily generates water sensitivity, so the well is recommended not to be water-flooding. The actual exploitation of the target well adopts conventional cold exploitation, natural energy drive and water drive. And (4) trial production is carried out on the well section of 1498.7-1502 m, daily oil is 4.3t, and water content is 72.7%.
In a word, the problems that reservoir micro-fluid distribution characteristics are not clear, fluid property evaluation is not accurate, a pilot production horizon is difficult to determine and the like in exploitation of part of current development wells can be solved through the process and the method, the purposes of fine evaluation and benefit development are achieved, and the method has a wide application prospect.
Claims (2)
1. A method for evaluating a logging of a trial production horizon of a development well is characterized by comprising the following steps: a trial production horizon suggestion is proposed by carrying out comparative analysis on the well-logging data and the core or rotating well wall coring sample data of a reservoir, and the method specifically comprises the following steps:
step (1), performing lithology identification on a sample, and judging the lithology of a reservoir;
step (2), performing microscopic characteristic evaluation on the reservoir and judging the type of the reservoir;
step (3), evaluating the oil content of the reservoir and judging the oil content of the reservoir;
step (4), comprehensively evaluating the fluid properties of the reservoir and judging the fluid properties of the reservoir;
and (5) according to the evaluation conclusion of the steps (2) to (4), proposing a trial-mining horizon suggestion and a reference suggestion for later development, and providing a basis for formulation of next working measures and compilation of a development scheme.
2. The method for evaluating the logging of the trial production horizon of a development well according to claim 1, which is characterized in that: the step (1) specifically comprises the steps of carrying out rock and ore identification and X-ray diffraction whole-rock mineral analysis on a rock core or a borehole wall coring sample, determining the name of the rock according to the color, the structure, the mineral components and the content of the rock, and identifying sensitive minerals: quick-sensitive minerals (kaolinite and illite), water-sensitive minerals (montmorillonite and illite mixed layer), and acid-sensitive minerals (chlorite).
The step (2) specifically comprises the steps of carrying out nuclear magnetic resonance logging analysis on a core or a rotating well wall coring sample to obtain porosity and permeability parameters of a reservoir, and carrying out nuclear magnetic resonance T2Fitting the spectrum into a curve similar to a mercury intrusion curve, judging displacement pressure, and judging the characteristics of reservoir distortion, sorting property and the like by utilizing the curve form; performing fluorescence slice analysis on a conventional borehole wall coring sample, and qualitatively determining the connectivity of pores, the particle size, the distribution state of oil and water in microscopic pores and the like by observing the characteristics of the pores under a mirror;
and the step (3) specifically comprises the steps of carrying out pyrolysis localization analysis, thermal evaporation hydrocarbon analysis and quantitative fluorescence analysis on the core or borehole wall coring sample, and carrying out oil content evaluation on the reservoir stratum. Pyrolysis and chemical analysis to obtain natural gas peak S0Gasoline peak S1Peak S of coal and diesel oil21Wax, heavy oil peak S22Colloidal and asphaltene peaks S23The total gas content Pg, the light-weight ratio index Ps and other parameters; analyzing thermal evaporation hydrocarbon to obtain parameters such as main peak carbon number, carbon number range and the like; and (3) obtaining parameters such as fluorescence intensity F, oil concentration C, oiliness index R and the like by quantitative fluorescence. The light-to-weight ratio index Ps is the content of light components (S) thermally decomposed from crude oil0+S1+S21) With the content of heavy components (S)22+S23) Ratio of. The oiliness index R is the ratio of the fluorescence intensity of the medium component to the fluorescence intensity of the light component. According to the analysis results, evaluating the crude oil properties and the oil-gas abundance of the reservoir according to the standards of the tables 1 and 2;
TABLE 1
TABLE 2
And (4) comprehensively evaluating the fluid property of the reservoir stratum of the target well according to the standard of the table 3 according to the trial production data of the adjacent well of the well zone, the electrical property of the adjacent well and the high-low contrast of the oil-gas abundance and the reservoir stratum evaluation result of the step 2 and the analysis result of the crude oil property and the oil-gas abundance in the step 3, and drawing a comprehensive evaluation chart of the logging of the oil-gas reservoir. The contents of the logging comprehensive evaluation chart comprise depth, lithology, logging natural potential, natural gamma, a resistivity curve, pyrolysis geological parameters, quantitative fluorescence parameters, fluid property evaluation conclusions and the like.
TABLE 3
And the step (5) specifically comprises the step of proposing single mining or combined mining suggestions to an oil layer and an oil-water layer with large thickness according to the reservoir evaluation result in the step (2) and the reservoir fluid property interpretation result in the step (4). And aiming at the type of clay minerals, a mining mode suggestion is provided to achieve the purpose of oil layer protection. For example, in a reservoir containing water-sensitive minerals, the water-sensitive phenomenon in the water injection process is prevented as much as possible; the water injection speed in development of a reservoir containing quick sensitive minerals cannot be too high, and the like; and the reservoir containing the acid-sensitive minerals does not adopt an acidification mode as much as possible.
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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 |
| CN115078599B (en) * | 2021-03-10 | 2024-05-31 | 中国石油化工股份有限公司 | Reservoir connectivity evaluation method based on crude oil whole component concentration |
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Effective date of registration: 20240113 Address after: Room 1202, No. 22, Chaoyangmen North Street, Chaoyang District, Beijing 100020 Patentee after: Sinopec Petroleum Engineering Technology Service Co.,Ltd. Patentee after: SINOPEC SHENGLI PETROLEUM ENGINEERING Co.,Ltd. Patentee after: Sinopec Jingwei Co.,Ltd. Patentee after: Shengli geological logging company of Sinopec Jingwei Co.,Ltd. Address before: 100101 Beichen West Road, Chaoyang District, Beijing 8 Beichen world center, block A 703. Patentee before: SINOPEC OILFIELD SERVICE Corp. Patentee before: SINOPEC SHENGLI PETROLEUM ENGINEERING Co.,Ltd. Patentee before: GEOLOGICAL LOGGING BRANCH OF SINOPEC SHENGLI PETROLEUM ENGINEERING Co.,Ltd. |