CN113761620B - Shale gas middle gas layer well geological guiding method - Google Patents
Shale gas middle gas layer well geological guiding method Download PDFInfo
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- CN113761620B CN113761620B CN202110941580.4A CN202110941580A CN113761620B CN 113761620 B CN113761620 B CN 113761620B CN 202110941580 A CN202110941580 A CN 202110941580A CN 113761620 B CN113761620 B CN 113761620B
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- G06—COMPUTING; CALCULATING OR COUNTING
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- E21B7/00—Special methods or apparatus for drilling
- E21B7/04—Directional drilling
- E21B7/046—Directional drilling horizontal drilling
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Abstract
The application provides a shale gas middle gas layer well geological guiding method, which comprises the following steps: s1, carrying out comprehensive geological evaluation by counting geological parameters of each small layer in a target layer of a work area, and further carrying out comprehensive geological evaluation of the target layer after the work area enters a development and adjustment period; s2, calculating the predicted recovery ratio of development adjustment; s3, predicting the dynamic condition of the target layer and judging the development potential of the target layer; s4, compiling a target point and a horizontal section of the work area to pass through a reference basic data table, and comparing a target window of the work area with a mark layer of the work area; s5, screening out a horizontal well geosteering target passing stratum of the work area; and S6, performing tracking contrast analysis in the drilling process by combining the selected lithological characteristics and the lithological characteristics of the target layer, and adjusting the track of the horizontal well in time to ensure that the track of the horizontal well passes through the target layer. The method can obtain the three-dimensional geosteering profile with higher accuracy, and realize the geosteering of the well to be drilled.
Description
Technical Field
The application relates to the field of shale gas development, in particular to a shale gas middle gas layer well geological guiding method.
Background
Shale gas is used as a new clean green energy source and is an effective supplement for conventional petroleum and coal energy sources, the shale gas development has the characteristic of fast decline, the North America decline rate is generally 70%, and the improvement of the shale gas recovery rate is important for the stable yield and the production of gas fields.
However, the whole thickness of the middle gas layer is small, the change of the logging electrical characteristics is not obvious, when the attitude of the stratum is greatly changed, the corresponding relation between the horizontal well track and the marking layer is difficult to judge on site, the situation that the horizontal well track penetrates out of the target stratum due to underground and marking layer loss is easy to occur, the rotary steering technology is mainly adopted for foreign drilling, the speed is increased quickly, the cost is high, and the accuracy is low.
Disclosure of Invention
The application provides a shale gas middle gas layer well geological guiding method, and aims to solve the problem that in the prior art, the accuracy of traversing a target stratum is low in the development and adjustment stage of a shale gas middle gas layer well.
The technical scheme of the application is as follows:
a shale gas middle gas layer well geosteering method comprises the following steps:
s1, carrying out geological comprehensive evaluation by counting geological parameters of each small layer in a target layer of a work area, integrating development dynamic data by combining the current situation of exploration and development of the work area, and further carrying out geological comprehensive evaluation of the target layer after the work area enters a development adjustment period;
s2, calculating the predicted recovery ratio of development adjustment according to the regional well pattern which is subjected to exploration and development in the work area and by combining the data of reserve abundance, well control area and recoverable reserve which are subjected to development adjustment in the work area;
s3, representing developed stratum half-seam lengths in the overlying strata and the underburden of the target layer according to dynamic data of fracturing micro-seismic monitoring of the horizontal well in the work area, predicting the dynamic condition of the target layer, and judging the development potential of the target layer;
s4, collecting geological design, well drilling design, well logging and while-drilling data of the work area, compiling a target point and a horizontal section of the work area to pass through a reference basic data table, and comparing a target window of the work area with a mark layer of the work area;
s5, according to the data obtained in the steps S1, S2 and S3, screening a target layer after the shale gas field enters a development adjustment period, and screening out a horizontal well geosteering target passing stratum of the work area;
s6, according to the target passing stratum of the work area selected in the step S5, in the drilling process of the horizontal well, tracking contrast analysis is carried out in the drilling process by combining the selected lithological combination characteristics, well logging electrical characteristics and lithology characteristics of the target layer, the track of the horizontal well is adjusted, and the track of the horizontal well is ensured to pass through the target layer.
As an embodiment of the present invention, in step S1, the geological parameters include effective layer thickness, shale quality, shale gas-bearing property, shale rock mechanical property, and storage conditions of each small layer.
As one technical solution of the present application, in step S3, the fracture microseismic data of the horizontal well includes the length, width, height, and fracture azimuth of the fracture, and the spatial distribution of the fracture network form.
In step S3, the developed formation half-fracture length in the underlying formation and the formation on the target layer is characterized by an extension width of the fracturing fracture perpendicular to the wellbore direction in a plane, an extension height of the fracturing fracture perpendicular to the wellbore direction in a cross section, and an extension length along the wellbore direction.
As one solution of the present application, in step S3, the overburden and the underburden are both developed formations.
As a technical solution of the present application, in step S6, during the drilling implementation of the horizontal well, a trajectory is adjusted according to an observation of a production dynamic parameter of an adjacent production-oriented horizontal well.
The beneficial effect of this application:
the application provides a shale gas horizontal well geosteering recommended method after entering a development adjustment period, which has a theoretical foundation, establishes a nanoscale reservoir characterization and fine description technology, and lays a foundation for sea-phase shale gas longitudinal small layer fine division and layered development; guiding a passing target window of a middle gas layer adjusting well by screening a high-quality passing dessert section of the middle gas layer; for the underground region with buried depth of 3000-3500 m, the marker layer is lost and the target window range is only 5 m, well-seismic combined geosteering modeling is established, and a middle gas layer guiding recommendation method is created, so that the development efficiency and accuracy are effectively improved, and the development cost is greatly reduced.
Drawings
In order to more clearly explain 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 that for those skilled in the art, other related drawings can be obtained from these drawings without inventive effort.
FIG. 1 is a comprehensive histogram of the division of the target zone of a pilot borehole provided in the embodiments of the present application;
fig. 2 is a horizontal fracturing construction micro-seismic monitoring event point layout diagram of a target well and an adjacent well in a work area according to an embodiment of the present application;
fig. 3 is a schematic diagram of horizontal well geosteering trajectory control provided in 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 "upper", "lower", and the like refer to 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 present invention are conventionally placed in use, and are used for convenience in describing the present application and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present application.
Further, in the present application, unless expressly stated or limited otherwise, the first feature may be directly contacting the second feature or may be directly contacting the second feature, or the first and second features may be contacted with each other through another feature therebetween, not directly contacting the second feature. Also, the first feature being above, on or above the second feature includes the first feature being directly above and obliquely above the second feature, or merely means that the first feature is at a higher level than the second feature. A first feature that underlies, and underlies a second feature includes a first feature that is directly under and obliquely under a second feature, or simply means that the first feature is at a lesser level than the second feature.
Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather 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 also to be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "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.
Example (b):
referring to fig. 1 and fig. 2 and 3 in combination, an embodiment of the present application provides a shale gas middle gas layer well geosteering method, including the following steps:
s1, carrying out geological comprehensive evaluation by counting geological parameters of each small layer in a target layer of a work area, integrating development dynamic data by combining the current situation of exploration and development of the work area, and further carrying out geological comprehensive evaluation of the target layer after the work area enters a development adjustment period; dividing a target layer of the pilot hole in the work area according to regional geological data, and determining a pilot mark layer and mark points;
s2, calculating the predicted recovery ratio of development adjustment according to the regional well pattern which is subjected to exploration and development in the work area and by combining the data of the reserve abundance, the well control area and the recoverable reserve which are subjected to development adjustment in the work area; the method aims to preferably adapt to the well arrangement position and the well arrangement mode of the shale gas horizontal well in the development and adjustment period, and the horizontal wells are more in number after the shale gas field enters the development and adjustment stage, so that the reserves of blocks are used to a certain extent, and the horizontal wells mainly need to select the areas with higher residual recoverable reserves to be deployed and implemented in the stage;
s3, representing the developed stratum half-seam length in the overlying strata and the underlying strata of the target layer according to dynamic data of fracturing microseismic monitoring of the horizontal well in the work area, predicting the dynamic condition of the target layer, and judging the development potential of the target layer; the method can guide the development and adjustment of the stratum selection in the step, and mainly aims to remove the limitation that the stratum selection is mainly carried out by geological comprehensive evaluation in the early stage and more consider the unswept range of adjacent well fracturing modification to carry out the target stratum selection;
s4, collecting geological design, well drilling design, well logging and while-drilling data of the work area, compiling a target point and a horizontal section of the work area to pass through a reference basic data table, and comparing a target window of the work area with a mark layer of the work area;
s5, according to the data obtained in the steps S1, S2 and S3, screening a target layer after the shale gas field enters a development adjustment period, and screening a horizontal well geosteering target passing stratum of the work area;
s6, according to the target passing stratum of the work area selected in the step S5, in the drilling process of the horizontal well, tracking contrast analysis is carried out in the drilling process by combining the lithological characteristics and the lithological characteristics of the selected target layer, the track of the horizontal well is adjusted in time, and the track of the horizontal well is ensured to pass through the target layer; the method is characterized in that dynamic production parameters of adjacent production horizontal wells are observed in time, and the track is adjusted in time, different from the early development of a gas field, a large number of production wells exist in the development and adjustment period, the horizontal well geological guide penetrates through a target layer as far as possible on the premise of ensuring the safe production of the gas field, when complex drilling conditions and potential safety hazards exist, partial well sections should be abandoned properly and penetrate through different development layer series with adjacent wells, and the track in the target layer is controlled reasonably.
In step S1, the geological parameters include parameters such as effective layer thickness of each sub-layer, shale quality, shale gas-bearing property, shale rock mechanical property, and storage conditions.
Meanwhile, in step S1, the target layer division and the flag layer determination in the tile development adjustment stage are performed: the method mainly considers the combination of regional geological data and lithological and electrical adjustment of pilot hole sections of a pilot hole well and a horizontal well, and divides a target layer of a work area into three large sections, namely an upper section, a middle section and a lower section, wherein the upper section and the lower section are developed target layers of a gas field, and the middle section is an undeveloped target layer.
In step S3, the fracture microseismic data of the horizontal well includes data such as the length, width, height, and fracture azimuth of the fracture, and the spatial distribution of the fracture network.
In step S3, the developed formation half-fracture length of the overburden formation and the underburden formation of the target stratum is characterized by the extension width of the fracture perpendicular to the wellbore direction in the plane, the extension height of the fracture perpendicular to the wellbore direction in the section plane, the extension length along the wellbore direction and the like.
Note that in step S3, both the overburden and underburden are developed formations.
In summary, the application provides a shale gas horizontal well geosteering recommendation method after entering a development adjustment period, which has a theoretical basis, establishes a nanoscale reservoir characterization and fine description technology, and lays a foundation for sea-phase shale gas longitudinal small layer fine division and layered development; guiding a passing target window of a middle gas layer adjusting well by screening a high-quality passing dessert section of the middle gas layer; for the underground area with 3000-3500 m buried depth and with the missing mark layer and the target window range of only 5 m, well-seismic combined geosteering modeling is established, and a middle gas layer guiding recommendation method is created, so that the development efficiency and accuracy are effectively improved, and the development cost is greatly reduced.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (6)
1. A shale gas middle gas layer well geosteering method is characterized by comprising the following steps:
s1, carrying out geological comprehensive evaluation by counting geological parameters of each small layer in a target layer of a work area, integrating development dynamic data by combining the current situation of exploration and development of the work area, and further carrying out geological comprehensive evaluation of the target layer after the work area enters a development adjustment period;
s2, calculating the predicted recovery ratio of development adjustment according to the regional well pattern which is subjected to exploration and development in the work area and by combining the data of reserve abundance, well control area and recoverable reserve which are subjected to development adjustment in the work area;
s3, representing developed stratum half-seam lengths in the overlying strata and the underburden of the target layer according to dynamic data of fracturing micro-seismic monitoring of the horizontal well in the work area, predicting the dynamic condition of the target layer, and judging the development potential of the target layer;
s4, collecting geological design, well drilling design, well logging and while-drilling data of the work area, compiling a target point and a horizontal section of the work area to pass through a reference basic data table, and comparing a target window of the work area with a mark layer of the work area;
s5, according to the data obtained in the steps S1, S2 and S3, screening a target layer after the shale gas field enters a development adjustment period, and screening out a horizontal well geosteering target passing stratum of the work area;
s6, according to the target passing stratum of the work area selected in the step S5, in the drilling process of the horizontal well, tracking contrast analysis is carried out in the drilling process by combining the selected lithological combination characteristics, well logging electrical characteristics and lithology characteristics of the target layer, the track of the horizontal well is adjusted, and the track of the horizontal well is ensured to pass through the target layer.
2. The shale gas middle gas layer well geosteering method of claim 1, wherein in step S1, the geological parameters include effective layer thickness, shale quality, shale gas bearing, shale rock mechanical properties and storage conditions of each small layer.
3. The shale gas middle gas layer well geosteering method of claim 1, wherein in step S3, the fracture microseismic data of the horizontal well comprises the length, width, height and fracture azimuth of the fracture and the spatial distribution of the fracture network form.
4. The shale gas middle gas well geosteering method of claim 1, wherein characterizing developed formation half-fracture lengths in the target overburden formation, underburden formation comprises characterizing an extension width of a fracture in a plane perpendicular to a wellbore direction, an extension height of the fracture in a cross section perpendicular to the wellbore direction, and an extension length in a wellbore direction in step S3.
5. The shale gas middle gas well geosteering method of claim 1, wherein in step S3, both the overburden and the underburden are developed formations.
6. A shale gas middle gas layer well geosteering method as claimed in claim 1, wherein in step S6, during drilling implementation of said horizontal well, adjustments to trajectory are made based on observing production dynamic parameters adjacent to an already-on-production horizontal well.
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| CN105464592A (en) * | 2015-03-31 | 2016-04-06 | 中国石油化工股份有限公司江汉油田分公司勘探开发研究院 | Shale gas horizontal well geosteering method |
| CN106869790A (en) * | 2017-02-24 | 2017-06-20 | 中石化重庆涪陵页岩气勘探开发有限公司 | A kind of quick fine geology guidance method of shale gas horizontal well |
| CN108442882A (en) * | 2018-03-01 | 2018-08-24 | 中石化江汉石油工程有限公司 | Shale gas extended horizontal well based on 2-d seismic data is with brill geosteering method |
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Patent Citations (3)
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| CN105464592A (en) * | 2015-03-31 | 2016-04-06 | 中国石油化工股份有限公司江汉油田分公司勘探开发研究院 | Shale gas horizontal well geosteering method |
| CN106869790A (en) * | 2017-02-24 | 2017-06-20 | 中石化重庆涪陵页岩气勘探开发有限公司 | A kind of quick fine geology guidance method of shale gas horizontal well |
| CN108442882A (en) * | 2018-03-01 | 2018-08-24 | 中石化江汉石油工程有限公司 | Shale gas extended horizontal well based on 2-d seismic data is with brill geosteering method |
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