阅读说明：本技术 一种页岩气开发调整穿行层位的优选方法 (Optimal selection method for shale gas development adjustment of passing horizon ) 是由 蔡进 刘莉 孟志勇 张谦 刘超 邹威 沈童 于 2021-08-17 设计创作，主要内容包括：一种页岩气开发调整穿行层位的优选方法,涉及页岩气开发领域。页岩气开发调整穿行层位的优选方法包括以下步骤：在页岩气田开发初期的区块,基于所述页岩气田的区块内评价井的分析化验样品表现出的页岩气田原生品质、页岩气田含气性和页岩气田可压性选取水平井的穿行层位；在页岩气田大规模开发的区块,进入开发调整期设计相同目的层井网加密水平井时,通过邻近井的生产参数对设计水平井的目前地层压力、剩余可采储量、裂缝发育情况进行预测并选取水平井的穿行层位。本实施例提供的页岩气开发调整穿行层位的优选方法能在生产动态参数角度出发对水平井穿行层位进行优选,从而提高页岩气田产能的目的。(A preferred method for adjusting a passing horizon in shale gas development relates to the field of shale gas development. The preferable method for adjusting the passing horizon of the shale gas development comprises the following steps: in a block at the initial stage of shale gas field development, selecting a passing horizon of a horizontal well based on shale gas field primary quality, shale gas field gas content and shale gas field compressibility shown by an analysis test sample of an evaluation well in the block of the shale gas field; in a large-scale development block of the shale gas field, when a well pattern encrypted horizontal well of the same target layer is designed in a development adjustment period, the current formation pressure, the residual recoverable storage capacity and the crack development condition of the designed horizontal well are predicted through the production parameters of adjacent wells, and the passing layer of the horizontal well is selected. The optimal selection method for adjusting the horizontal well traversing horizon in shale gas development provided by the embodiment can optimize the horizontal well traversing horizon from the perspective of dynamic production parameters, so that the purpose of improving the shale gas field productivity is achieved.)

1. A preferable method for shale gas development and adjustment of a passing horizon is characterized by comprising the following steps:

in a block at the initial stage of shale gas field development, selecting a passing horizon of a horizontal well based on shale gas field primary quality, shale gas field gas content and shale gas field compressibility shown by an analysis test sample of an evaluation well in the block of the shale gas field;

in a large-scale development block of the shale gas field, when a well pattern encrypted horizontal well of the same target layer is designed in a development adjustment period, the current formation pressure, the residual recoverable storage capacity and the crack development condition of the designed horizontal well are predicted through the production parameters of adjacent wells, and the passing layer of the horizontal well is selected.

2. The shale gas development adjustment transitive horizon optimization method according to claim 1, wherein when a well pattern encrypted horizontal well of a same target layer is designed in a development adjustment period in a large-scale development block of a shale gas field, and a horizontal well is designed in an area with a large adjacent well interval, a low adjacent well accumulated yield and a large area residual reserve, the transitive horizon is determined by taking shale gas field original quality, shale gas field gas content, shale gas field compressibility, an accumulated gas yield of an adjacent well, a residual recoverable reserve and current formation pressure as a basis.

3. The shale gas development adjustment traversing layer optimizing method according to claim 1, wherein when a well pattern encrypted horizontal well of the same target layer is designed in a development adjustment period in a large-scale development block of a shale gas field, when a horizontal well is designed in a region which is relatively small in separation from an adjacent well, high in accumulated yield of the adjacent well and relatively small in residual reserve of a region of the adjacent well, the accumulated gas yield, residual recoverable reserve, current formation pressure and fracture scale prediction of the adjacent well are used as main bases, and the traversing layer is determined by using shale gas field original quality and shale gas field gas content conditions as secondary bases.

4. A preferred method of shale gas development zonation adjustment for shale gas production as claimed in claim 1, wherein the production parameters of the adjacent wells comprise gas production capacity, remaining recoverable reserves, current formation pressure, simulated frac size.

Technical Field

The application relates to the field of shale gas development, in particular to a preferable method for adjusting a passing horizon in shale gas development.

Background

In the process of shale gas resource development at present 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 penetration is a key factor for determining shale gas development. At present, in the development of the shale gas area block in China, large-scale development and adjustment are not carried out, only primary implementation is carried out in part of the shale dam of the Fuling shale gas field, in the development and adjustment stage, the selection principle of the passing horizon is obviously different from the emphasis of initial development, the primary quality and the gas content of shale in the initial development stage are particularly important, and the selection of the passing horizon is the most favorable passing horizon comprehensively selected from the aspects of the geological conditions, the reservoir conditions, the compressibility, the gas content and the like of the shale reservoir in combination with geophysical seismic data.

The existing method for determining the shale gas horizontal well traversing horizon mainly aims at an original stratum which is not developed in a large scale, and geological conditions in the area at the stage are not influenced by the large scale development, so that geological static parameters are mainly considered in selecting the traversing horizon, and horizons with good geological conditions in all aspects are optimal development horizons; for a block which is developed in a large scale and enters a development and adjustment stage, it is not reasonable to select a passing horizon from geological static parameters, and the stratum entering the development and adjustment stage has external influences such as stratum fracture development condition change, stratum pressure change, stratum water content condition change and the like due to continuous production of an adjacent horizontal well, and needs to be comprehensively considered.

Disclosure of Invention

The application aims to provide a shale gas development adjustment traversing layer optimizing method, which can optimize a horizontal well traversing layer from the perspective of production dynamic parameters, so that the shale gas field productivity is improved.

The embodiment of the application is realized as follows:

the embodiment of the application provides a preferable method for adjusting a passing horizon in shale gas development, which comprises the following steps:

in a block at the initial stage of shale gas field development, selecting a passing horizon of a horizontal well based on shale gas field primary quality, shale gas field gas content and shale gas field compressibility shown by an analysis test sample of an evaluation well in the block of the shale gas field;

in a large-scale development block of the shale gas field, when a well pattern encrypted horizontal well of the same target layer is designed in a development adjustment period, the current formation pressure, the residual recoverable storage capacity and the crack development condition of the designed horizontal well are predicted through the production parameters of adjacent wells, and the passing layer of the horizontal well is selected.

In some optional embodiments, when a well pattern encrypted horizontal well of the same target zone is designed in a development adjustment period in a large-scale development block of a shale gas field, and a horizontal well is designed in an area with a large interval between adjacent wells, low accumulated yield of the adjacent wells and large residual reserve of the area, the passing horizon is determined by using the primary 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 formation pressure as the basis.

In some optional embodiments, when a horizontal well is designed in a region with small separation from an adjacent well, high accumulated yield of the adjacent well and small residual reserve of the adjacent well when a well pattern encrypted horizontal well of the same target layer is designed in a development adjustment period in a large-scale shale gas field development block, the accumulated gas yield, the residual recoverable reserve, the current formation pressure and the fracture scale of the adjacent well are predicted to be used as main bases, and the original quality of the shale gas field and the gas-bearing condition of the shale gas field are used as secondary bases to determine a passing horizon.

In some alternative embodiments, the production parameters of the adjacent well include gas production capacity, remaining recoverable reserves, current formation pressure, simulated fracture size.

The beneficial effect of this application is: the preferable method for shale gas development and adjustment of the passing horizon provided by the embodiment comprises the following steps: in a block at the initial stage of shale gas field development, selecting a passing horizon of a horizontal well based on shale gas field primary quality, shale gas field gas content and shale gas field compressibility shown by an analysis test sample of an evaluation well in the block of the shale gas field; in a large-scale development block of the shale gas field, when a well pattern encrypted horizontal well of the same target layer is designed in a development adjustment period, the current formation pressure, the residual recoverable storage capacity and the crack development condition of the designed horizontal well are predicted through the production parameters of adjacent wells, and the passing layer of the horizontal well is selected. The optimal selection method for shale gas development adjustment of the walk-through layer provided by this embodiment adds dynamic parameters such as residual recoverable quantity, gas production capacity accumulated by adjacent wells, formation pressure at present and the like on the basis that the existing walk-through layer selects static parameters such as primary quality, gas content and compressibility of the shale gas field, and can better solve the problems that after the shale gas field enters the development adjustment period, well patterns are dense, geological conditions are similar in a small range, and the layer is difficult to be optimal solely from the static parameters, so that the horizontal well walk-through layer is optimal from the perspective of dynamic parameters of production, 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 required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.

FIG. 1 is a flowchart illustrating steps of a preferred method for adjusting a traversal horizon for shale gas development according to an embodiment of the present disclosure.

FIG. 2 is a single-well comprehensive histogram referred to when a horizon is selected in the preferred method for adjusting a traversal horizon for shale gas development according to an embodiment of the present application;

fig. 3 is a relational diagram between a horizontal well traversing horizon of a Fuling shale gas field coke dam block and productivity, which are referenced when a horizon is selected by the preferred method for adjusting a traversing horizon for shale gas development provided by the embodiment of the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in 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 obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the application usually place when in use, and are used only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the devices or elements being referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present application. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical", "overhang" and the like do not imply that the components are required to be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the 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 is further noted that, unless expressly stated or limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact of the first and second features, or may comprise contact of the first and second features not directly but through another feature in between. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The features and performance of the preferred method for shale gas development through-horizon reconciliation of the present application are described in further detail below with reference to examples.

As shown in fig. 1, fig. 2 and fig. 3, the preferred method for shale gas development adjustment of a traversal horizon provided in this embodiment includes the following steps:

in a block at the initial stage of shale gas field development, selecting a passing horizon of a horizontal well based on shale gas field primary quality, shale gas field gas content and shale gas field compressibility shown by an analysis test sample of an evaluation well in the block of the shale gas field;

in a large-scale development block of a shale gas field, when a well pattern encrypted horizontal well of the same target layer is designed in a development adjustment period, the current stratum pressure, the residual recoverable reserve and the fracture development condition of the designed horizontal well are predicted and the passing layer of the horizontal well is selected according to the accumulated gas production rate, the residual recoverable reserve and the current stratum pressure of adjacent wells and the simulation fracture scale. When a horizontal well is designed in a region with large spacing from an adjacent well, low accumulated yield of the adjacent well and large residual reserve capacity of the region, determining a passing horizon by using 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 well, the residual recoverable reserve capacity and the current formation pressure as the basis; in a large-scale development block of the shale gas field, when a well pattern encrypted horizontal well of the same target layer is designed in a development adjustment period, when a horizontal well is designed in a region with small separation from an adjacent well, high accumulated yield of the adjacent well and small residual reserve of the region of the adjacent well, the accumulated gas yield, residual recoverable reserve, current formation pressure and fracture scale prediction of the adjacent well are used as main bases, and the passing horizon is determined by using the original quality of the shale gas field and the gas content condition of the shale gas field as secondary bases.

The optimal method for adjusting the crossing horizon in shale gas development provided by the embodiment is used by combining analysis and test data of an evaluation well of a shale gas field in fig. 2, the quality of the horizon geological condition is judged from the primary quality, gas content and compressibility of the shale gas field of a target stratum, and the first small stratum is considered to be the optimal development horizon, so that the first small stratum is selected as the horizontal well crossing horizon in the initial development stage of the shale gas field, the length of the first small stratum crossed by the horizontal well and the single-well test yield can be verified to have a good positive correlation from the actual production effect, and the method for selecting the crossing horizon from the primary quality, gas content and compressibility of the shale gas field in the initial development stage of a large scale is reasonable as shown in fig. 3.

When a block of a shale gas field enters a development adjustment stage from a large-scale development stage, and a selective layer-penetrating principle at the initial development stage of the shale gas field is tried to carry out horizontal well layer penetrating, the fact that the development effect of the horizontal well deployed according to the deployment does not reach the expected effect completely is found, and the horizontal well deployed in part of the development adjustment stage has the complex conditions of large-scale well leakage, stratum pressure relief area, stratum water production and the like which do not appear in the area originally, and the change of the stratum conditions caused by the production of adjacent wells has obvious influence on the development effect of the newly deployed horizontal well, so when the block of the shale gas field enters the development adjustment stage, the factors of the production condition, the residual recoverable reserve, the current stratum pressure, the fracturing scale and the like of the adjacent wells form the influence factors mainly considered in the development adjustment stage, and the design well deals with the current residual geological reserve, the design area, The method comprises the steps that at present, stratum pressure, the development condition of a predicted crack and the like are reasonably predicted, so that a passing horizon is selected under comprehensive consideration, when a horizontal well is designed in a region with a large distance from an adjacent well, low accumulated yield of the adjacent well and large residual reserve of the region, the accumulated gas yield of the adjacent well is small, the difference between the stratum condition of a deployment region and the original condition is considered not to be large, the passing horizon is selected, geological conditions and the production condition are comprehensively considered, and the passing horizon is determined according to the comprehensive consideration of the original quality of a 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 well, the residual recoverable reserve and the current stratum pressure; when a horizontal well is designed in a region with small separation from an adjacent well, high accumulated yield of the adjacent well and small residual reserve of the region of the adjacent well, the accumulated gas yield of the adjacent well is high, and when the fracturing fracture scale is large, the accumulated gas yield, the residual recoverable reserve, the current formation pressure and the fracturing fracture scale of the adjacent well are predicted to be used as main bases, and the original quality of the shale gas field and the gas content condition of the shale gas field are used as secondary bases to determine a passing horizon.

The embodiments described above are some, but not all embodiments of the present application. The detailed description of the embodiments of the present application is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.