CN113638727B - Optimization method for shale gas development and adjustment of passing horizon - Google Patents
Optimization method for shale gas development and adjustment of passing horizon Download PDFInfo
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- CN113638727B CN113638727B CN202110940498.XA CN202110940498A CN113638727B CN 113638727 B CN113638727 B CN 113638727B CN 202110940498 A CN202110940498 A CN 202110940498A CN 113638727 B CN113638727 B CN 113638727B
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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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/30—Specific pattern of wells, e.g. optimizing the spacing of wells
- E21B43/305—Specific pattern of wells, e.g. optimizing the spacing of wells comprising at least one inclined or horizontal well
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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
A preferred method for adjusting a passing horizon by shale gas development relates to the field of shale gas development. The preferred method for adjusting the passing horizon by shale gas development comprises the following steps: selecting a passing horizon of a horizontal well in a block at the early stage of shale gas field development based on shale gas field primary quality, shale gas field gas-bearing property and shale gas field compressibility shown by an analysis test sample of an evaluation well in the block of the shale gas field; when a block for large-scale development of shale gas fields enters a development adjustment period to design the same purpose layer well pattern encryption horizontal well, the current formation pressure, residual recoverable reserves and crack development conditions of the designed horizontal well are predicted through production parameters of adjacent wells, and a passing horizon of the horizontal well is selected. The preferred method for adjusting the passing horizon by shale gas development provided by the embodiment can be used for optimizing the horizontal well passing horizon from the aspect of dynamic parameter production, so that the purpose of improving the productivity of shale gas fields is achieved.
Description
Technical Field
The application relates to the field of shale gas development, in particular to a preferred method for adjusting a passing horizon by shale gas development.
Background
In the current stage of shale gas resource development at home and abroad, a horizontal well is a main drilling mode, and in the process of drilling the horizontal well, the accuracy of stratum crossing is a key factor for determining shale gas development. At present, in the development of the domestic shale gas zone blocks, development and adjustment are not developed on a large scale, only preliminary implementation is carried out in the part of the coke dam of the Fuling shale gas field, in the development and adjustment stage, the principle of selecting the passing horizon is obviously different from the emphasis of initial development, the original quality and gas content of the shale in the initial development are particularly important, and the selected passing horizon is the most favorable passing horizon comprehensively selected from the aspects of the localization condition, the reservoir condition, the compressibility, the gas content and the like of shale reservoirs in combination with geophysical seismic data.
The existing method for determining the passing horizon of the shale gas horizontal well is mainly aimed at an original stratum which is not subjected to large-scale development, and geological conditions of a region at the stage are not affected by the large-scale development, so that the geological static parameters are mainly considered in selecting the passing horizon, and the horizons with good geological conditions in all aspects are the optimal development horizons; for the block which has been developed in a large scale and has entered the development and adjustment stage, it is not reasonable to select the passing horizon from the geological static parameters, and the stratum entering the development and adjustment stage has external influences such as stratum crack development condition change, stratum pressure change, stratum water content change and the like due to continuous production of the adjacent horizontal well, so that comprehensive consideration is needed.
Disclosure of Invention
The purpose of the application is to provide a preferred method for adjusting the passing horizon by shale gas development, which can be used for optimizing the passing horizon of a horizontal well from the aspect of dynamic parameter production, so that the purpose of improving the productivity of shale gas fields is achieved.
Embodiments of the present application are implemented as follows:
the embodiment of the application provides a preferred method for adjusting a passing horizon by shale gas development, which comprises the following steps:
selecting a passing horizon of a horizontal well in a block at the early stage of shale gas field development based on shale gas field primary quality, shale gas field gas-bearing property and shale gas field compressibility shown by an analysis test sample of an evaluation well in the block of the shale gas field;
when a block for large-scale development of shale gas fields enters a development adjustment period to design the same purpose layer well pattern encryption horizontal well, the current formation pressure, residual recoverable reserves and crack development conditions of the designed horizontal well are predicted through production parameters of adjacent wells, and a passing horizon of the horizontal well is selected.
In some alternative embodiments, when a zone of large-scale development of the shale gas field enters a development adjustment period to design a well pattern encryption horizontal well of the same purpose layer, when the horizontal well is designed in a region with large interval between adjacent wells, low accumulated production of the adjacent wells and large residual reserve of the region, the passing horizon is determined by taking the raw quality of the shale gas field, the gas content of the shale gas field, the compressibility of the shale gas field, the accumulated gas production of the adjacent wells, the residual recoverable reserve and the current formation pressure as the basis.
In some alternative embodiments, when the horizontal well is designed in a region with small separation from the adjacent well, high accumulated production of the adjacent well and small residual reserves of the region of the adjacent well, the accumulated gas production of the adjacent well, the residual recoverable reserves, the current formation pressure and the fracturing fracture scale prediction are taken as main basis and the primary quality of the shale gas field and the gas content condition of the shale gas field are taken as secondary basis to determine the passing horizon when the block for large-scale development of the shale gas field enters the development adjustment period to design the well pattern encryption horizontal well of the same purpose layer.
In some alternative embodiments, the production parameters of the adjacent well include cumulative gas production, residual recoverable reserves, current formation pressure, simulated fracture size.
The beneficial effects of this application are: the preferred method for adjusting the passing horizon by shale gas development provided by the embodiment comprises the following steps: selecting a passing horizon of a horizontal well in a block at the early stage of shale gas field development based on shale gas field primary quality, shale gas field gas-bearing property and shale gas field compressibility shown by an analysis test sample of an evaluation well in the block of the shale gas field; when a block for large-scale development of shale gas fields enters a development adjustment period to design the same purpose layer well pattern encryption horizontal well, the current formation pressure, residual recoverable reserves and crack development conditions of the designed horizontal well are predicted through production parameters of adjacent wells, and a passing horizon of the horizontal well is selected. According to the preferred method for developing shale gas and adjusting the passing horizon, dynamic parameters such as the residual recoverable quantity, the accumulated gas yield of adjacent wells, the current stratum pressure and the like are added on the basis of the existing passing horizon selection mainly referring to the original quality, the gas content, the compressibility and the like of the shale gas field, the difficulty that the shale gas field is denser in well patterns, similar in geological conditions in a small range and difficult to be optimized from the static parameters singly can be well solved, and therefore the horizontal well passing horizon is optimized from the aspect of dynamic production parameters, and the purpose of improving the productivity of the shale gas field is achieved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered limiting the scope, and that other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flowchart of a preferred method for adjusting a traversing horizon in shale gas development according to an embodiment of the present application.
FIG. 2 is a single well synthetic histogram referenced when selecting horizons for a preferred method for shale gas development adjustment of traversing horizons provided in embodiments of the present application;
FIG. 3 is a graph of the horizontal well travel horizon versus productivity of a block Jiao Danba of a Fuling shale gas field referenced when selecting horizons for a preferred method for adjusting travel horizons for shale gas development provided by embodiments of the present application.
Detailed Description
For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, which are generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present application, as provided in the accompanying drawings, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the present application, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are directions or positional relationships based on those shown in the drawings, or are directions or positional relationships that are conventionally put in use of the product of the application, are merely for convenience of description of the present application and simplification of description, and are not indicative or implying that the apparatus or element to be referred to must have a specific direction, be configured and operated in a specific direction, and therefore should not be construed as limiting the present application. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal," "vertical," "overhang," and the like do not denote a requirement that the component be absolutely horizontal or overhang, but rather may be slightly inclined. As "horizontal" merely means that its direction is more horizontal than "vertical", and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present application, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context.
In this application, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, and may also include the first and second features not being in direct contact but being in contact with each other by way of additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
The features and performance of the preferred methods of adjusting the zone of traversal for shale gas development of the present application are described in further detail below in conjunction with the examples.
As shown in fig. 1, 2 and 3, the preferred method for adjusting the passing horizon by shale gas development provided in this embodiment includes the following steps:
selecting a passing horizon of a horizontal well in a block at the early stage of shale gas field development based on shale gas field primary quality, shale gas field gas-bearing property and shale gas field compressibility shown by an analysis test sample of an evaluation well in the block of the shale gas field;
when a block for large-scale development of shale gas fields enters a development adjustment period to design a well pattern encryption horizontal well of the same purpose layer, the current formation pressure, the residual recoverable reserves and the crack development condition of the designed horizontal well are predicted through the accumulated gas yield, the residual recoverable reserves, the current formation pressure and the simulated fracture scale of the adjacent well, and the passing horizon of the horizontal well is selected. When a block for large-scale development of the shale gas field enters a development adjustment period to design a well pattern encryption horizontal well of the same purpose layer, when the horizontal well is designed in a region with large interval between adjacent wells, low accumulated production of the adjacent wells and large regional residual reserves, the traversing horizon is determined by taking the original quality of the shale gas field, the gas content of the shale gas field, the compressibility of the shale gas field, the accumulated gas yield of the adjacent wells, the residual recoverable reserves and the current stratum pressure as the basis; when a block for large-scale development of the shale gas field enters a development adjustment period to design a well pattern encryption horizontal well with the same purpose layer, when the horizontal well is designed in a region with small interval from an adjacent well, high accumulated yield of the adjacent well and small residual reserve of the region of the adjacent well, the accumulated yield, the residual recoverable reserve, the current formation pressure and the fracturing fracture scale of the adjacent well are taken as main basis, and the primary quality of the shale gas field and the gas content condition of the shale gas field are taken as secondary basis to determine a passing horizon.
When the preferred method for developing and adjusting the passing horizon of shale gas provided by the embodiment is used, the analysis and test data of the evaluation well of the shale gas field in fig. 2 are combined, the quality of geological conditions of the horizon is judged from the original quality, gas content and compressibility of the shale gas field of the target horizon, the (1) small layer is considered to be the optimal development horizon, so that the horizontal well passing small layer is selected as the (1) small layer in the initial stage of development of the shale gas field, the good positive correlation relationship between the length of the horizontal well passing through the (1) small layer and the single well test yield can be verified from the actual production effect, and the reasonable method for selecting the passing horizon from the original quality of the shale gas field, the gas content of the shale gas field and the compressibility of the shale gas field in the initial stage of large-scale development is illustrated as shown in fig. 3.
When a block of the shale gas field enters a development adjustment stage from a large-scale development stage, trying to carry out horizontal well perforation by using a selective perforation principle at the development initial stage of the shale gas field, finding that the development effect of the horizontal well deployed in the development adjustment stage is not all expected according to the development effect of the horizontal well deployed in the development adjustment stage, and the complex conditions such as large-scale well leakage, formation pressure relief area, formation water production and the like which are not originally present in the area appear in the horizontal well deployed in the development adjustment stage, wherein the development effect of the newly deployed horizontal well is obviously influenced by the change of formation conditions caused by the production of the adjacent well, so that when the block of the shale gas field enters the development adjustment stage, the production condition of the adjacent well, the residual recoverable horizon, the current residual geological reserve, the current formation pressure, the fracture scale and the like are mainly considered in the development stage, the design well is reasonably predicted according to the influence factors of the current residual geological reserve, the current pressure of the design area, the predicted fracture development condition and the like, so that the perforation horizon selection is comprehensively considered, when the horizontal well is designed in the area with large spacing between the adjacent well, the adjacent well is low, the residual capacity of the area has great influence on the development effect of the newly deployed horizontal well, and the condition is considered to be less in consideration of the condition of the residual gas field, the condition of the adjacent well can be comprehensively considered to be the condition of the perforation condition of the condition and the perforation condition of the adjacent well, and the condition is comprehensively considered to be the condition is not considered to be the condition and the perforation condition and the condition and has; when the horizontal well is designed in the area with smaller separation from the adjacent well, higher accumulated production of the adjacent well and smaller residual reserves of the area adjacent to the well, the accumulated production of the adjacent well, the residual recoverable reserves, the current formation pressure and the size prediction of the fracturing cracks are taken as main basis, and the primary quality of the shale gas field and the gas content condition of the shale gas field are taken as secondary basis to determine the passing horizon when the size of the fracturing cracks is larger.
The embodiments described above are some, but not all, of the embodiments of the present application. The detailed description of the embodiments of the present application is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
Claims (2)
1. A preferred method for adjusting the crossing horizon of shale gas development, which is characterized by comprising the following steps:
selecting a passing horizon of a horizontal well in a block at the early stage of shale gas field development based on shale gas field primary quality, shale gas field gas-bearing property and shale gas field compressibility shown by an analysis test sample of an evaluation well in the block of the shale gas field;
when a block for large-scale development of shale gas fields enters a development adjustment period to design a well pattern encryption horizontal well of the same purpose layer, predicting the current formation pressure, residual recoverable reserves and crack development conditions of the designed horizontal well through production parameters of adjacent wells, and selecting a passing horizon of the horizontal well;
when a block for large-scale development of the shale gas field enters a development adjustment period to design a well pattern encryption horizontal well of the same purpose layer, when the horizontal well is designed in a region with large interval between adjacent wells, low accumulated production of the adjacent wells and large residual reserve of the region, the passing horizon is determined by taking the original quality of the shale gas field, the gas content of the shale gas field, the compressibility of the shale gas field, the accumulated gas yield of the adjacent wells, the residual recoverable reserve and the current stratum pressure as the basis;
when a block for large-scale development of the shale gas field enters a development adjustment period to design a well pattern encryption horizontal well of the same purpose layer, when the horizontal well is designed in a region with smaller interval from an adjacent well, high accumulated yield of the adjacent well and smaller residual reserve of the region of the adjacent well, the accumulated yield, the residual recoverable reserve, the current formation pressure and the fracturing fracture scale of the adjacent well are used as main basis, and the primary quality of the shale gas field and the gas content condition of the shale gas field are used as secondary basis to determine a passing horizon.
2. The preferred method of shale gas development adjustment of the zone of traversal of claim 1, wherein the production parameters of the adjacent wells comprise cumulative gas production, residual recoverable reserves, current formation pressure, simulated fracture scale.
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