CN114970935A - Resform-based coal bed gas horizontal well fracturing layer section optimization method - Google Patents
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Abstract
The invention relates to the field of coal bed gas exploitation, in particular to a method for optimizing a fractured interval of a coal bed gas horizontal well based on form. Comprises the following steps. S100, collecting well trajectory data, stratum information, rock debris description, gas logging value, gamma while drilling and casing joint hoops, and then importing the well trajectory data, the stratum information, the rock debris description, the gas logging value, the gamma while drilling and the casing joint hoops into Resform software. S200, drawing a geological guide map by using Resform software according to the loaded lithology data, stratum, total hydrocarbon, gamma value, drilling time, production casing joint and other related data. S300, controlling a target layer through pilot hole data and adjacent well data, and drawing a relation graph of a well trajectory and a coal seam. S400, exporting the drawn geological guide graph, well trajectory and coal seam relation graph in a picture form. S500. the well logging data are superposed on the comprehensive section map, and the fracturing performance of different horizontal sections is comprehensively analyzed by combining the well drilling data. S600, evaluating the gas content of different horizontal sections according to lithology and total hydrocarbon value, and optimizing the fracturing section.
Description
Technical Field
The invention relates to the field of coal bed gas exploitation, in particular to a Resform-based coal bed gas horizontal well fracturing interval optimization method.
Background
The coal bed gas has the characteristics of low pressure, low permeability, low gas saturation, strong heterogeneity and the like, and the hydraulic fracturing is the most common permeability-increasing transformation technology for coal bed gas exploitation at present. In recent years, with the continuous maturity and development of the staged fracturing technology of the coal bed gas horizontal well, the technology gradually becomes an important means for increasing the yield of the coal bed gas. Compared with a vertical well, the coal bed gas horizontal well can communicate the original fracture of the coal reservoir to the greatest extent, enlarge the contact area between the shaft and the coal reservoir and increase the seepage channel of the coal bed gas. And hydraulic fracturing is carried out on the basis, so that the gas control area of the horizontal well can be further increased, a more complete fracture network system is formed in the reservoir, the permeability of the reservoir is increased, and the yield of the coal bed gas single well is effectively increased.
The length of the horizontal segment of the coal bed gas horizontal well is generally 800-1000m, and the length of the horizontal segment of the south region of the water seepage basin is generally about 800m according to the structural characteristics of the coal body and the mechanical properties of the coal reservoir. However, due to the difference between the characteristics of the current steering technology and the field steering capability, the horizontal well cannot be drilled in the coal seam all the time in the long-distance drilling process, a certain drilling rate exists, and the horizontal well sometimes enters the top plate and sometimes enters the bottom plate. Meanwhile, due to the strong heterogeneity of the coal reservoir, the difference between the local reservoir parameters is large, especially in the region which is significantly influenced by the structure. Therefore, how to select an ideal fracturing section in the horizontal section of 800m can realize the high-efficiency permeability increase of a single fracturing section, can form effective interference between the sections, enlarges the influence range of the whole drainage and pressure relief of a coal bed section, forms a volume effect which is an ideal effect pursued by the fracturing of the current coal bed gas horizontal well, and is also a direction lacking and improving the fracturing of the current coal bed gas horizontal well.
Therefore, research on the optimal technology of the fracturing section of the coal bed gas horizontal well is carried out, the fracturing modification effect of the horizontal well is effectively improved, and the difficult point which needs to be solved at present is urgently needed.
Disclosure of Invention
In order to overcome the defect of the optimization technology of the horizontal section, the number of the fracturing sections is generally 5-6 for the horizontal section of the coal seam with the length of 800m, and the distance between the fracturing sections is generally 120-150 m. The selection of the fracturing sections is often highly empirical, so that the fracturing position is often not the position with the best gas display degree, or effective interference is difficult to form among different fracturing sections, and the volume effect cannot be realized to the maximum degree. Finally, the problems that the gas production rate of the horizontal well is low, the gas production period is short and the like often occur, and the preferable technical method for the fractured interval of the coal bed gas horizontal well based on Resform is provided.
The invention adopts the following technical scheme: a preferable method for a fracturing interval of a coalbed methane horizontal well based on Resform comprises the following steps.
S100, collecting well trajectory data, stratum information, rock debris description, gas logging value, gamma while drilling and casing joint hoops, and then importing the well trajectory data, the stratum information, the rock debris description, the gas logging value, the gamma while drilling and the casing joint hoops into Resform software.
S200, drawing a geological guide map by using Resform software according to the loaded lithology data, stratum, total hydrocarbon, gamma value, drilling time, production casing joint and other related data.
S300, controlling a target layer through pilot hole data and adjacent well data, and drawing a relation graph of a well bore track and a coal bed.
S400, exporting the drawn geological guide graph, well trajectory and coal seam relation graph in a picture form.
S500. the well logging data are superposed on the comprehensive section map, and the fracturing performance of different horizontal sections is comprehensively analyzed by combining the well drilling data.
S600, evaluating the gas content of different horizontal sections according to lithology and total hydrocarbon value, and optimizing the fracturing section.
In the step S500, according to the principle of selecting a fracturing interval of the coal bed gas horizontal well: firstly, the position with better coal bed gas effect is selected as a fracturing perforation position in each fracturing section, so that the reservoir transformation effect is guaranteed, the fracturing construction difficulty is reduced, and an ideal gas production effect is obtained; and secondly, the reasonable interval of the fracturing sections is determined, mutual drainage and production depressurization coupling interference is formed as much as possible, the depressurization control range and the fracturing transformation effect of the whole horizontal section are improved, and meanwhile, the layers among the fracturing sections need to be avoided from being connected in series.
In the step S600, the fracturing point is selected in the middle of the coal seam, and the top plate, the bottom plate and the mine section with the gangue are avoided, and meanwhile, a region with relatively low shale content, relatively low gamma value, relatively high gas measurement display and relatively low drilling time in the coal seam is selected for fracturing.
Compared with the prior art, the method provided by the invention has the advantages that data such as gamma, gas logging, drilling time, rock debris and the like in the drilling process of the coal bed gas horizontal well are fully combined according to data analysis advantages of the Resform software, and a scientific and reliable coal bed gas horizontal well fracturing layer section optimization technology is established. Meanwhile, the multi-stage fracturing of the horizontal section is realized by optimizing the distance between fracturing sections, the drainage and mining coupling depressurization interference among the fracturing layer sections is formed, the drainage depressurization control area of the coal bed is increased, the stratum seepage capability is improved, and the yield of the horizontal well is increased to the maximum extent.
Drawings
FIG. 1 is a geosteering diagram;
FIG. 2 is a diagram of a well trajectory versus a coal seam;
FIG. 3 is a preferred diagram of a fractured interval of a coalbed methane horizontal well.
Detailed Description
A preferable method for a fractured interval of a coalbed methane horizontal well based on Resform comprises the following steps.
S100, collecting well trajectory data, stratum information, rock debris description, gas logging value, gamma while drilling and casing joint hoops, and then importing the well trajectory data, the stratum information, the rock debris description, the gas logging value, the gamma while drilling and the casing joint hoops into Resform software. Opening Resform software → opening a work area, selecting data service → loading well bit data, and loading the collected data such as well trajectory data, formation information, rock debris description, gas logging value, gamma while drilling, production casing joint hoop and the like.
S200, drawing a track, creating a profile view → selecting well position coordinates → selecting a data channel to be loaded, and drawing a geological guide map by using related data such as lithology data, stratum, total hydrocarbon, gamma value, drilling time, production casing joint and the like after loading by using Resform software.
S300, controlling a target layer through pilot hole data and adjacent well data, and drawing a relation graph of a well trajectory and a coal seam.
S400, exporting the drawn geological guide graph, well trajectory and coal bed relation graph in a picture form.
S500, overlaying logging data on the comprehensive profile, and comprehensively analyzing the fracturing performance of different horizontal sections by combining drilling data; according to the selection principle of the fracturing layer sections of the coal bed gas horizontal well: firstly, the position with better coal bed gas effect is selected as a fracturing perforation position in each fracturing section, so that the reservoir transformation effect is guaranteed, the fracturing construction difficulty is reduced, and an ideal gas production effect is obtained; and secondly, the reasonable interval of the fracturing sections is determined, mutual drainage and production depressurization coupling interference is formed as much as possible, the depressurization control range and the fracturing transformation effect of the whole horizontal section are improved, and meanwhile, the layers among the fracturing sections need to be avoided from being connected in series.
S600, evaluating the gas content of different horizontal sections according to lithology and total hydrocarbon value, and optimizing the fracturing section. The fracturing point is selected in the middle of the coal seam, the top plate, the bottom plate and the well section with the gangue are avoided, and meanwhile, the fracturing is carried out in a region with relatively low mud content, relatively low gamma value, relatively high gas logging display and relatively low drilling time in the coal seam.
By adopting a Resform-based coalbed methane horizontal well fracturing section optimization technology, the coalbed methane horizontal well fracturing section is optimized, small-scale tests are carried out in Zhengzhuang blocks, a relatively ideal effect is achieved, and the yield of most wells is cultivated at 5000m or above. A typical No. 1 well is selected as an example for analysis, the horizontal section of the well is 800m in total, and the horizontal section is analyzed by adopting a preferable technology of a Resform horizontal well fracturing section, so that the mud content at the depths of 1086m-1140m, 1170m-1240m, 1240m-1290m, 1320m-1350m, 1390m-1420m, 1470m-1570m, 1610m-1640m, 1640m-1710m and the like is relatively low, the gas logging display is relatively high, and the coal bed drilling rate is high. And perforation fracture locations were selected at 9 of these depths, the detailed parameters are shown in table 1.
Horizontal interval fracturing interval optimization for well No. 11 in Table
| Fracturing segment | Depth m of perforation | Spacing m | Gamma API |
| First stage | 1704 | 28 | |
| Second section | 1628 | 76 | 29 |
| Third stage | 1550 | 78 | 26 |
| Fourth stage | 1480 | 70 | 33 |
| Fifth stage | 1400 | 80 | 32 |
| Sixth stage | 1334 | 66 | 37 |
| Seventh stage | 1270 | 64 | 33 |
| Eighth stage | 1210 | 60 | 34 |
| Ninth paragraph | 1130 | 80 | 41 |
Claims (4)
1. A method for optimizing a fracturing interval of a coalbed methane horizontal well based on Resform is characterized by comprising the following steps: comprises the following steps of (a) preparing a solution,
s100, collecting well trajectory data, stratum information, rock debris description, gas logging value, gamma while drilling and casing joint hoops, and then importing the well trajectory data, the stratum information, the rock debris description, the gas logging value, the gamma while drilling and the casing joint hoops into Resform software;
s200, drawing a geological guide map by using Resform software to the loaded lithology data, stratum, total hydrocarbon, gamma value, drilling time, production casing joint and other related data;
s300, controlling a target layer through pilot hole data and adjacent well data, and drawing a relation graph of a well trajectory and a coal bed;
s400, exporting the drawn geological guide graph, well trajectory and coal seam relation graph in a picture form;
s500, comprehensively analyzing the fracturing performance of different horizontal sections by superposing the logging data on the comprehensive section map and combining the drilling data;
s600, evaluating the gas content of different horizontal sections according to lithology and total hydrocarbon value, and optimizing the fracturing section.
2. The Resform-based method for optimizing a fracturing interval of a coalbed methane horizontal well, according to claim 1, wherein: in the step S500, according to the principle of selecting a fracturing interval of the coal bed gas horizontal well: the position with better coal bed gas effect is selected as the fracturing perforation position in each fracturing section, so that the reservoir transformation effect is guaranteed, the fracturing construction difficulty is reduced, and the ideal gas production effect is obtained.
3. The Resform-based method for optimizing a fracturing interval of a coalbed methane horizontal well, according to claim 1, wherein: in step S500, the method further includes, according to the principle of selecting a fracturing interval of the coal bed gas horizontal well: and determining reasonable fracturing section intervals, forming mutual drainage and production depressurization coupling interference as much as possible, improving the depressurization control range and the fracturing transformation effect of the whole horizontal section, and avoiding the layers among the fracturing sections from being connected in series.
4. The Resform-based method for optimizing a fracturing interval of a coalbed methane horizontal well, according to claim 1, wherein: in the step S600, the fracturing point is selected in the middle of the coal seam, avoiding the top plate, the bottom plate and the section of the mine with the gangue, and simultaneously, a region with relatively low shale content, relatively low gamma value, relatively high gas measurement display and relatively low drilling time is selected for fracturing.
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| CN115354991A (en) * | 2022-08-31 | 2022-11-18 | 成都理工大学 | Coal-based gas reservoir favorable fracturing layer section optimization method |
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