CN109424359B - Horizontal well interlayer identification method - Google Patents
Horizontal well interlayer identification method Download PDFInfo
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- CN109424359B CN109424359B CN201710791159.3A CN201710791159A CN109424359B CN 109424359 B CN109424359 B CN 109424359B CN 201710791159 A CN201710791159 A CN 201710791159A CN 109424359 B CN109424359 B CN 109424359B
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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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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
Abstract
The invention relates to a horizontal well interlayer identification method, which comprises the steps of firstly identifying an interlayer on a single well through a vertical well or a pilot hole, establishing a skeleton section, determining a division scheme of the interlayer, and displaying repeated strata in a segmented manner according to the change condition of a well track of the horizontal well to obtain a segmented section; comparing the stratum comparison marks and the logging curve forms on the sectional profiles, identifying the same stratum and interlayer, comparing the stratum and interlayer with interlayer division results of a vertical well or a pilot hole well adjacent to the horizontal well, and determining a primary division result of the interlayer of the horizontal well; and then, corresponding the preliminary division results of the stratum and the interlayer to a horizontal well track, and determining a final division result by combining the transverse variation trend of the earthquake. The method for identifying the horizontal well interlayer can accurately identify the interlayer encountered by the horizontal well by using a repeated stratum subsection display method, and is favorable for more accurately identifying the distribution of the residual oil.
Description
Technical Field
The invention belongs to the technical field of petroleum development, and particularly relates to a method for identifying a horizontal well interlayer.
Background
Interbedding is ubiquitous in continental facies deposits, and its size, spread, and location of development in the reservoir have a significant impact on fluid flow, and interbedded data is an important part of reservoir description in the middle and later stages of oilfield development. The interlayer is accurately identified, and the method plays an important role in potential excavation of residual oil.
The patent with application publication number CN106777514A discloses a method for quantitatively classifying and identifying an oil sand interlayer, which is to establish an oil sand interlayer identification chart based on a small amount of cores and logging curves, so that the identification of the oil sand interlayer is quantified, and the identification accuracy of the interlayer is improved.
The horizontal well drilling has more interlayer layers, the track of the well section is long, and the same sand body and the interlayer layers possibly appear on the horizontal section for many times due to the up-and-down floating of the track in the drilling process, so that the identification difficulty is high. At present, the existing interlayer identification method can only be applied to a vertical well or a pilot hole well, and cannot carry out fine identification and research on the interlayer of a horizontal well.
Disclosure of Invention
The invention aims to provide a horizontal well interlayer identification method, so that the problem that the existing interlayer identification method cannot be applied to a horizontal well is solved.
In order to realize the purpose, the technical scheme adopted by the invention is as follows:
the method for identifying the horizontal well interlayer comprises the following steps:
1) identifying the interlayer of the vertical well or the pilot hole well in the research area according to the well drilling and logging information;
2) establishing a skeleton section according to the stratum contrast marks in the research area and the interlayer identified in the step 1), and determining a partition scheme of the interlayer;
3) Correcting the horizontal well from the measurement depth to the vertical depth, and displaying the repeated stratum in a segmented manner according to the change condition of the well track of the horizontal well to obtain a segmented section;
4) determining the display direction of the corresponding stratum on the sectional profile according to the floating direction change of the horizontal well track, comparing the sectional profile according to the stratum comparison mark and the logging curve form, and identifying the same stratum and interlayer to obtain the stratum and interlayer information of the sectional profile;
5) comparing the stratum and interlayer information of the segmented section obtained in the step 4) with interlayer division results of a vertical well or a pilot hole well adjacent to the horizontal well, and determining a primary division result of the interlayer of the horizontal well;
6) and (3) corresponding the preliminary division result of the horizontal well interlayer determined in the step 5) to a horizontal well track, and determining a final division result of the horizontal well interlayer by combining the transverse change trend of the earthquake.
In the step 2), the partition scheme of the interlayer is determined by classifying, naming and numbering the interlayer.
The method for identifying the horizontal well interlayer accurately identifies the interlayer drilled by the horizontal well by using a repeated stratum segmented display method, increases effective data points representing the interlayer in a research area, is favorable for accurately identifying the distribution of the residual oil, and provides scientific guidance for the residual oil potential excavation in the middle and later stages of oil field development.
Drawings
FIG. 1 is a schematic diagram of the division of vertical wells and pilot wells in a study area according to an embodiment of the present invention;
FIG. 2 is a sectioned cross-sectional view of a horizontal well according to an embodiment of the present invention;
FIG. 3 is a diagram of a preliminary division result of the interlayer of the horizontal well according to the embodiment of the invention;
FIG. 4 is a final partitioning result diagram of the horizontal well interlayer of the embodiment of the invention;
FIG. 5 is a well site implementation drawing.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings.
Examples
The method for identifying the horizontal well interlayer is applied to the ancient cloudlet oilfield Y2-P1 wells, the number of the interlayer encountered by the wells is large, the length of the horizontal segment reaches 823m, and the method specifically comprises the following steps:
1) and identifying the interlayer of the vertical well or the pilot hole well according to the existing drilling, coring and logging information in the research area. The lithology of the interlayer is mudstone or sandy mudstone, and the electrical measurement curve shows that a microelectrode, a natural potential and a natural gamma curve have return or abnormity;
2) applying stratum contrast marks in a research area and the interlayer identified in the step 1), establishing a skeleton section, determining an interlayer dividing scheme of a vertical well or a pilot hole well, and naming and numbering the interlayer (as shown in figure 1);
3) Correcting the Y2-P1 well from the Measured Depth (MD) to The Vertical Depth (TVD), and displaying the repeated stratum in a segmented mode according to the change situation of the horizontal well trajectory (shown in figure 3) to obtain a segmented section (shown in figure 2);
4) and identifying and determining the display direction (the arrow direction in figure 2) of the corresponding stratum on the section according to the changing direction (the arrow direction in figure 3) of the up-and-down floating of the horizontal well track. Comparing the stratum comparison marks with the logging curve forms on the sectional profiles, and identifying the same stratum and the interlayer, so as to obtain interlayer information (a black solid line in the figure 2 is the step 2) of the sectional profiles, namely named and numbered interlayers in the interlayer dividing scheme, and a dotted line is an unnamed and numbered interlayer in the dividing scheme);
5) and comparing the division result with the division result of the interlayer of the vertical well or the pilot hole well adjacent to the horizontal well, and determining the preliminary division result of the interlayer of the horizontal well.
6) Marking the preliminary division result of the interlayer determined in the step 5) at the corresponding position of the horizontal well track (the black solid line in the figure 3 is the step 2), designating the numbered interlayer in the interlayer division scheme, and the dotted line is the unnamed and numbered interlayer in the division scheme), and determining the final interlayer division result by combining the lateral variation trend of the earthquake (as shown in the figure 4).
And 3) displaying the repeated stratum in sections according to the change condition of the well track, wherein the stratum on each section is not repeated.
After the method of the embodiment is applied to identifying the interlayer of the Y2-P1 well, the interlayer and the small layer of the well during drilling are clarified, in FIG. 4, 200m of the tail end of a Y2-P1 horizontal well during drilling in the lower reservoir is influenced by the interlayer, the upper reservoir is not controlled by a well network, according to the identification result of the interlayer of the horizontal well, a side well Y3-C2 (shown in FIG. 5) is deployed and implemented, the well is produced in the year 5 and the month 28 in 2017, the initial daily production liquid is 17.3t, the daily production oil is 13.3t, the water content is 23%, and the accumulated production oil reaches 475.4t in the year 7 and the month 17 in 2017. Successful implementation of the well proves that the precision of identifying the interlayer of the horizontal well is high, and further the distribution of the residual oil is verified.
Claims (1)
1. The method for identifying the horizontal well interlayer is characterized by comprising the following steps of:
1) identifying the interlayer of the vertical well or the pilot hole well in the research area according to the well drilling and logging information;
2) establishing a skeleton section according to the stratum contrast mark in the research area and the interlayer identified in the step 1), and determining the partition scheme of the interlayer of the vertical well or the pilot hole well; the division scheme for determining the interlayer of the vertical well or the pilot hole well is to classify, name and number the interlayer of the vertical well or the pilot hole well;
3) Correcting the horizontal well from the measurement depth to the vertical depth, and displaying the repeated stratum in a segmented manner according to the change condition of the well track of the horizontal well to obtain a segmented section;
4) determining the display direction of the corresponding stratum on the sectional profile according to the floating direction change of the horizontal well track, comparing the sectional profile according to the stratum comparison mark and the logging curve form, and identifying the same stratum and interlayer to obtain the stratum and interlayer information of the sectional profile;
5) comparing the stratum and interlayer information of the segmented section obtained in the step 4) with interlayer division results of a vertical well or a pilot hole well adjacent to the horizontal well, and determining a primary division result of the interlayer of the horizontal well;
6) and (3) corresponding the preliminary division result of the horizontal well interlayer determined in the step 5) to a horizontal well track, and determining a final division result of the horizontal well interlayer by combining the transverse change trend of the earthquake.
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