CN111396011A - Method and device for improving gas production rate of double-branch U-shaped well - Google Patents
Method and device for improving gas production rate of double-branch U-shaped well Download PDFInfo
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- CN111396011A CN111396011A CN201910001668.0A CN201910001668A CN111396011A CN 111396011 A CN111396011 A CN 111396011A CN 201910001668 A CN201910001668 A CN 201910001668A CN 111396011 A CN111396011 A CN 111396011A
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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
- E21B43/25—Methods for stimulating production
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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
- E21B37/00—Methods or apparatus for cleaning boreholes or wells
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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
- E21B7/00—Special methods or apparatus for drilling
- E21B7/04—Directional drilling
- E21B7/046—Directional drilling horizontal drilling
Abstract
The invention discloses a method and a device for improving gas production of a double-branch U-shaped well, wherein the method comprises the following steps: establishing a daily gas production database of double U-shaped wells; determining the double-branch U-shaped well as a first type well, a second type well or a third type well in sequence according to the daily gas production rate of the peak value of the double-branch U-shaped well, and analyzing the sudden drop condition of the gas production rate; for the first type well or the second type well with suddenly reduced gas production, if the horizontal branch of the first type well or the second type well is completed by adopting a slotted screen pipe, the horizontal branch is washed, and if the horizontal branch of the second type well is not completed by adopting the slotted screen pipe, the drilled horizontal branch is butted with the vertical production well; for the third type of well, the additional drilling of the horizontal branch is docked with the vertical production well, depending on the geological conditions. The invention can improve the gas production rate of the double-branch U-shaped well.
Description
Technical Field
The invention relates to the field of oil and gas exploitation, in particular to a method and a device for improving gas production of a double-branch U-shaped well.
Background
The double U-shaped wells are successful technologies for developing medium-coal-rank coal bed gas at present, the technology is successfully tested in a Moranbah gas field in a Bowen basin in Australia in 2003, the gas production rate of a single well reaches 3-8 ten thousand square/day, and the stable production period is 2-3 years. Compared with a vertical well, the double-branch U-shaped well has the characteristics of large coal reservoir contact area, wide control range, high gas production rate of a single well and the like; compared with a pinnate horizontal well, the method has the characteristics of small drilling risk, capability of performing well flushing and the like. However, in actual operation, the gas production of the double-branch U-shaped well may be lower than expected due to geological and well drilling completion, and no method for improving the gas production of the double-branch U-shaped well exists at present.
Therefore, it is necessary to provide a method for improving the gas production of the double-branch U-shaped well.
Disclosure of Invention
The embodiment of the invention provides a method for improving gas production of a double-branch U-shaped well, which is used for improving the gas production of the double-branch U-shaped well and comprises the following steps:
establishing a daily gas production database of double U-shaped wells;
determining the double-branch U-shaped well as a first type well, a second type well or a third type well in sequence according to the daily gas production rate of the peak value of the double-branch U-shaped well, and analyzing the sudden drop condition of the gas production rate;
for the first type well or the second type well with suddenly reduced gas production, if the horizontal branch of the first type well or the second type well is completed by adopting a slotted screen pipe, the horizontal branch is washed, and if the horizontal branch of the second type well is not completed by adopting the slotted screen pipe, the drilled horizontal branch is butted with the vertical production well;
for the third type of well, the additional drilling of the horizontal branch is docked with the vertical production well, depending on the geological conditions.
Optionally, the method further includes:
and carrying out statistical analysis on the parameters of the double U-shaped wells in the gas field, and establishing an evaluation standard of the geological and well drilling and completion parameters.
Optionally, determining the double-branch U-shaped well as the first type well, the second type well or the third type well in sequence according to the peak daily gas production rate of the double-branch U-shaped well, including:
according to the peak daily gas production database, according to a preset well number proportion, setting a high-low threshold value for dividing the peak gas production;
and determining that the double U-shaped wells are the first type well, the second type well or the third type well by using the high and low thresholds.
Optionally, the method further includes:
analyzing the change characteristics of the peak daily gas production of the double-branch U-shaped well according to the peak daily gas production database;
and (4) making an identification standard of sudden gas production rate reduction according to the analysis result, and accurately determining whether the sudden gas production rate reduction occurs in the double-branch U-shaped well or not by using the identification standard.
The embodiment of the invention also provides a device for improving the gas production of the double-branch U-shaped well, which is used for improving the gas production of the double-branch U-shaped well and comprises the following components:
the gas production rate acquisition module is used for establishing a daily gas production rate database of the double-branch U-shaped well;
the judging module is used for sequentially determining the double-branch U-shaped well as a first type well, a second type well or a third type well according to the daily gas production rate of the peak value of the double-branch U-shaped well and analyzing the sudden drop condition of the gas production rate;
the first processing module is used for washing the horizontal branch of the first type well or the second type well with suddenly reduced gas production rate if the horizontal branch is completed by adopting the slotted screen pipe, and drilling the horizontal branch to be in butt joint with the vertical production well if the horizontal branch is not completed by adopting the slotted screen pipe;
and the second processing module is used for butting the drilled horizontal branch with the vertical production well according to the geological conditions for the third type of well.
The embodiment of the present invention further provides a computer device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, and the processor implements the method when executing the computer program.
An embodiment of the present invention further provides a computer-readable storage medium, in which a computer program for executing the above method is stored.
According to the method for improving the gas production of the double-branch U-shaped well, provided by the embodiment of the invention, the wells in the gas field can be determined to be the first type well, the second type well or the third type well by establishing the daily gas production database of the double-branch U-shaped well, so that different operations can be carried out on different wells in the subsequent gas production improvement. By the aid of the method, for the first type well or the second type well with suddenly reduced gas production, if a horizontal branch of the first type well or the second type well is completed by adopting a slotted screen pipe, the horizontal branch is washed, and if the horizontal branch of the first type well or the second type well is not completed by adopting the slotted screen pipe, the drilled horizontal branch is butted with a vertical production well; for the third type of well, according to geological conditions, the horizontal branch is drilled and butted with the vertical production well, stratum fluid in the reservoir can be discharged into the vertical production well through the horizontal branch, continuous pressure relief of the reservoir is realized, and further the gas production rate of the double-branch U-shaped well is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts. In the drawings:
FIG. 1 is a schematic flow chart illustrating a method for increasing gas production of a double-branch U-shaped well according to an embodiment of the present invention;
FIG. 2 is a diagram of a specific example of a two-branch U-well in a coalbed methane field of the Bowen basin, Australia;
FIG. 3 is a graph of peak gas production profiles for wells of the first, second and third type in a coalbed methane field of the Bowen basin, Australia;
FIG. 4 is a graph of sudden gas production decline for a two-branch U-well in a coalbed methane field of the Bowen basin, Australia;
FIG. 5 is a stratigraphic column of a third type of well in a coalbed methane field of the Australian Bowen basin;
FIG. 6 is a schematic illustration of a poor interface between a vertical well and a horizontal branch of a third type of well in a coalbed methane field in the Bowen basin, Australia;
FIG. 7 is a graph comparing gas production before and after drilling a horizontal branch in a coalbed methane field in the Bowen basin of Australia;
fig. 8 is a schematic structural diagram of a device for increasing gas production of a double-branch U-shaped well in the embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the embodiments of the present invention are further described in detail below with reference to the accompanying drawings. The exemplary embodiments and descriptions of the present invention are provided to explain the present invention, but not to limit the present invention.
It should be noted that the double-branch U-shaped well refers to: two directional horizontal wells are drilled from the ground, run through the same coal reservoir and intersect a single vertical well at the end of the horizontal section. The vertical well is a gas and water production well, and a screw pump is generally arranged in the vertical well for draining water and reducing pressure. The horizontal well only provides a channel for gas and water in a reservoir to flow to the vertical well, the horizontal branch well bore is generally completed by adopting a slotted screen pipe to play a role in supporting the coal reservoir, but the horizontal branch well bore is sometimes completed by adopting an open hole, namely the slotted screen pipe is not used. The distance between the wellhead of the horizontal well and the ground of the vertical well is generally 1000-1500 m.
The embodiment of the invention provides a method for improving gas production of a double-branch U-shaped well, which comprises the following steps of:
And 102, sequentially determining the double-branch U-shaped well as a first type well, a second type well or a third type well according to the daily gas production of the peak value of the double-branch U-shaped well, and analyzing the sudden drop condition of the gas production.
103, for the first type well or the second type well with suddenly reduced gas production, if the horizontal branch of the first type well or the second type well is completed by adopting the slotted screen pipe, the horizontal branch is washed, and if the horizontal branch of the second type well is not completed by adopting the slotted screen pipe, the drilled horizontal branch is butted with the vertical production well.
And 104, for the third type of well, drilling the horizontal branch to be in butt joint with the vertical production well according to geological conditions.
According to the method for improving the gas production of the double-branch U-shaped well, provided by the embodiment of the invention, the wells in the gas field can be determined to be the first type well, the second type well or the third type well by establishing the daily gas production database of the double-branch U-shaped well, so that different operations can be carried out on different wells in the subsequent gas production improvement. By the aid of the method, for the first type well or the second type well with suddenly reduced gas production, if a horizontal branch of the first type well or the second type well is completed by adopting a slotted screen pipe, the horizontal branch is washed, and if the horizontal branch of the first type well or the second type well is not completed by adopting the slotted screen pipe, the drilled horizontal branch is butted with a vertical production well; for the third type of well, according to geological conditions, the horizontal branch is drilled and butted with the vertical production well, stratum fluid in the reservoir can be discharged into the vertical production well through the horizontal branch, continuous pressure relief of the reservoir is realized, and further the gas production rate of the double-branch U-shaped well is improved.
In step 101, in order to perform a comprehensive analysis on the gas production rate of the double-branch U-shaped well, a geological database and a well drilling and completion database may be established while establishing the daily gas production rate database of the double-branch U-shaped well, specifically:
the geological database comprises 5 parameters, namely coal reservoir thickness, coal reservoir heterogeneity degree, coal reservoir top and bottom plate sealing property, fault development condition and coal reservoir burial depth. The thickness of the coal reservoir is identified through a logging curve, and the response characteristics of the typical coal reservoir on the logging curve can be summarized into three-high one-low characteristics, namely high resistivity, high acoustic wave time difference, high neutrons and low density. The current drilling engineering technology requires that the thickness of a target coal reservoir for drilling horizontal branches is at least more than 1 m. The heterogeneous degree of the coal reservoir refers to the ratio of the thickness of the intercalated gangue to the coal reservoir. The gangue is mainly composed of swelling clay, and the permeability of a coal reservoir can be reduced, so that the gas production is influenced. The coal bed gas is generally confined by pressure water to form a reservoir, and if the top and bottom plates of the coal reservoir are sandstone and siltstone with poor sealing property, gas is easy to escape, so that the gas content of the coal reservoir is low, and the gas production is further influenced. The existence of the fault can cause that the horizontal branches of the double-branch U-shaped well cannot continuously drill in a coal reservoir, so that the track of a well hole is not smooth, the migration of gas and water in the well hole is influenced, and further the gas production rate is influenced; at the same time, faults can also lead to the escape of gases during the accumulation process, which is also detrimental to production. The coal bed gas is used as adsorption gas and is mainly controlled by pressure, namely the burial depth of a coal reservoir, and the gas content is increased along with the increase of the burial depth; however, the permeability of the coal reservoir decreases exponentially with the increase of the burial depth, so that the production is not favorable due to the excessive burial depth. The above 5 geological parameters have the greatest influence on the gas production of the double-branch U-shaped well.
The database of the drilling and completion of the double-branch U-shaped well comprises 4 parameters, namely the net length of the horizontal section of the coal reservoir, the inclination angle of the horizontal branch, whether the horizontal branch adopts slotted screen pipe completion or not and the butt joint condition of the horizontal branch and the vertical well. Limited by geological and engineering technical conditions, the horizontal branch well bores of the double-branch U-shaped well cannot ensure that all tracks are in the coal reservoir during the drilling process, and only the track length in the coal reservoir (namely the net length of the horizontal section of the coal reservoir) is the key for contributing to the gas production. The design that the vertical well bores of the double-branch U-shaped well are positioned at the declined tail ends of the horizontal branches ensures that the formation water flowing into the horizontal branch well bores through the slotted screen pipes can flow to the vertical well bores under the action of the self gravity and then is pumped and discharged to the ground by the screw rod pump, so that the reservoir can be rapidly depressurized. Theoretically, the larger the inclination angle of the horizontal branch, the more beneficial the drainage of formation water. If the horizontal branches of the double-branch U-shaped well are completed by adopting the slotted screen pipe, the stability of the horizontal branch well wall is enhanced, the collapse is not easy to occur, and the production is facilitated. The successful butt joint of the horizontal branch of the double-branch U-shaped well and the vertical well can ensure that formation fluid in the horizontal branch can smoothly enter the vertical well hole, namely the continuous pressure relief of a reservoir can be ensured, and the method is important for the production of the double-branch U-shaped well. An example of a double-branch U-shaped well is shown in FIG. 2.
The daily gas production database refers to the daily gas production data of the double-branch U-shaped well after production.
For the third type of well, the horizontal branch is drilled to interface with the vertical producing well only if the geological conditions are optimal. The criteria for excellent geological conditions are as follows: the thickness of the coal reservoir is more than or equal to 2m, the thickness proportion of gangue in the coal reservoir is less than or equal to 20%, the top and bottom plates of the coal reservoir are mudstones or shales with strong closure, the horizontal branches do not encounter or encounter a small number of small faults (generally less than or equal to 3), and the buried depth of the coal reservoir is less than or equal to 450 m; the criteria for the geological conditions to be poor are as follows: the thickness of the coal reservoir is less than 2m, the proportion of the thickness of the gangue in the coal reservoir is more than 20%, the top and bottom plates of the coal reservoir are sandstone or siltstone with poor closure, the number of small broken layers of horizontal branch drilling is more than 3 or large drilling fault, and the buried depth of the coal reservoir is more than 450 m.
The standard of excellent drilling and completion effect is as follows: the net length of the horizontal section of the coal reservoir is more than or equal to 800m, the vertical well is positioned at the declination tail end of the horizontal branch, the inclination angle of the horizontal branch is more than or equal to 10 degrees, the horizontal branch is completed by adopting a slotted screen pipe, and the horizontal branch is successfully butted with the vertical well; the criteria for poor drilling and completion results are as follows: the net length of the horizontal section of the coal reservoir is less than 800m, the inclination angle of the horizontal branch is less than 10 degrees, the horizontal branch is not completed by adopting a slotted screen pipe, and the butt joint of the horizontal branch and the vertical well is unsuccessful.
And determining the double U-shaped wells as a first type well, a second type well or a third type well in sequence according to the peak daily gas production rate of the double U-shaped wells. I.e. the gas production of the first type of well is greater than the gas production of the second type of well, which is greater than the gas production of the third type of well.
Before analyzing the daily gas production of the peak value of the double U-shaped well, data quality control is carried out. This is because the gas production is easily affected by the blockage of pulverized coal, and extreme values of abnormal high or low are generated, which are different from the normal gas production values before and after by several times, and are not representative, and therefore must be eliminated. In addition, because the fluctuation of the gas production rate of the coal bed gas well is large, three continuous maximum values of daily gas production rate are suggested to be selected firstly, and then the average value of the maximum values is taken as the peak daily gas production rate to be analyzed.
According to the analysis result of the daily gas production of the peak value of the double-branch U-shaped well of the gas field, the high and low threshold values (rounding values as much as possible) of the peak value gas production division are worked out approximately according to the proportion of 25%, 50% and 25% of the number of wells, and the first type well, the second type well and the third type well are sequentially determined. Under the condition that the number of the double-branch U-shaped wells of the gas field is small, the first well type, the second well type and the third well type of the double-branch U-shaped wells of the gas field in the adjacent areas or similar geological conditions can be used for reference.
The embodiment of the invention is a Moranbah coal bed gas field of a Bowen basin in Australia, 196 double-branch U-shaped wells are arranged in the gas field, and after the peak gas production is analyzed and processed and extreme values are removed, the distribution range of the daily gas production of the peak value is found to be 0.06-7.32 ten thousand square/day, which is shown in figure 3. According to the method, the determination standard of the first type of well in the gas field is that the peak daily gas production is more than 3 ten thousand square/day, and the proportion of the number of the wells is 24 percent; the determination standard of the second kind of well is that the peak daily gas production is 6 kilo-square/day-3 ten thousand-square/day, and the proportion of the number of wells is 51 percent; the determination criteria for the third type of well is that the peak daily gas production is <6 kFang/day, with a well number proportion of 25%.
The recognition mark of sudden gas production drop is that the gas production drop amplitude exceeds 20% in a short time (generally 1-3 days) under the condition that the working system is normal, and then the gas production is always maintained in a state of low gas production. The difference between sudden decrease of gas production and rapid decrease of gas production is mainly that the gas production decreases cliff-like in a short time. The gas production rate suddenly drops under abnormal working system conditions (such as pump stop and well shut-in), and is not in the analysis range. Fig. 4 is a graph of a sudden decrease in gas production in an example of the invention, with gas production of 0.7 ten thousand squares per day at 29 days 9 and 29 days 2012, the next day decreasing to 0.1 ten thousand squares per day, and subsequent gas production mostly below 0.2 ten thousand squares per day, indicating that a sudden decrease in gas production occurred at 30 days 9 and 2012.
In step 103, for the first type well and the second type well with sudden drop of gas production, if the horizontal branches are completed by adopting slotted screen, the sudden drop of gas production is caused by the blockage of the horizontal branch well bore, and the well flushing operation is performed on the horizontal branches so as to improve the gas production of the double-branch U-shaped well.
For a double U-shaped well, the vertical well is only a gas and water production well, the horizontal branch plays a key role in large-area communication with a coal reservoir, and the horizontal branch adopts slotted screen pipe well completion to ensure the stability of the well wall and maintain the smooth flow and rapid pressure relief of gas and water in the horizontal branch well hole towards the vertical well. During the production process, the pulverized coal flows to the horizontal branch well through the slots on the sieve tube along with formation water, when the pulverized coal is blocked in the horizontal branch well, namely gas and water transportation channels are blocked, the formation water cannot be effectively discharged, the pressure reduction process is suddenly stopped or greatly slowed down, so that the desorption process of the coal bed gas is influenced, and finally, the gas production rate is suddenly reduced. Both horizontal lateral boreholes of the double-leg U-shaped well of the example shown in fig. 4 were completed with slotted screens, and the analysis suggested that the sudden drop in gas production occurring at 9, 30 and 2012 was caused by blockage of the horizontal lateral boreholes.
For the first kind well and the second kind well with suddenly reduced gas production rate, if the horizontal branch is not completed with slotted screen pipe, the suddenly reduced gas production rate is caused by collapse of horizontal branch well bore, and horizontal branch should be drilled to butt joint with the vertical production well to raise the gas production rate of double-branch U-shaped well.
Due to the influence of faults, the distribution of the coal reservoir is discontinuous, so that the track of a well hole of a horizontal branch is not smooth in the drilling process, the subsequent screen pipe completion operation is difficult, and even the screen pipe lowering operation cannot be performed, namely the open hole completion is performed. Because the horizontal branch well lacks the support of the sieve tube, the horizontal branch well is very easy to collapse in the production process, a channel for gas and water migration is directly blocked, the reservoir can not effectively release pressure, the desorption process of the coal bed gas is blocked, and further the gas production rate is suddenly reduced. For the double-branch U-shaped well, the reason for sudden reduction of the gas production rate can be judged according to whether the horizontal branch is completed by adopting a slotted screen pipe or not, and the second situation is not illustrated.
For the third kind of wells, before determining whether the horizontal branch should be drilled and the vertical production well should be butted so as to improve the gas production rate of the double-branch U-shaped well, comprehensive evaluation and analysis of geological and drilling completion parameters should be carried out, and the condition of adjacent wells is referred, so that whether the reason of low yield is caused by a single factor or the two factors appear simultaneously is clarified.
Fig. 5 is a stratigraphic column of vertical wells of the third type in the example of the invention, the peak gas production of the double U-shaped wells is 3 kq/day, and the analysis shows that the top plate of the target coal reservoir is sandstone.
FIG. 6 is a schematic illustration of a third type of well according to an embodiment of the present invention in which the horizontal leg of the well has not successfully docked with the vertical well, wherein the peak daily gas production rate of the dual-leg U-shaped well is about 5 kFahrenheit/day, and analysis shows that one horizontal leg of the dual-leg U-shaped well has not successfully docked with the vertical well bore.
If the double-branch U-shaped well is divided into the third type well which is simply caused by well drilling factors, namely the geological condition is excellent, the gas production can be improved by butting the drilled horizontal branch with the vertical well.
The identification standard that the geological condition is excellent is as described above, but the restriction of the ground condition is considered at the same time, the number of horizontal branches to be drilled may be one or two, and the specific number of branches is determined according to the actual situation.
FIG. 7 is a graph comparing gas production before and after drilling horizontal branches in an embodiment of the present invention. The well is the same as the well in figure 6, after the reason of low yield is cleared, a horizontal branch is additionally drilled from 12 and 28 days in 2016 to 3 and 12 days in 2017 to be butted with the existing vertical production well, the gas yield rises rapidly after the well is opened again, and the peak gas yield exceeds 6 kFang/day, which indicates that the production increasing measures are successful.
In an embodiment of the present invention, the method further includes: and carrying out statistical analysis on the parameters of the double U-shaped wells in the gas field, and establishing an evaluation standard of the geological and well drilling and completion parameters.
By establishing the evaluation standard of the geological and well drilling and completion parameters, the root causes influencing the gas production can be clarified, so that different operations can be performed for different reasons when the gas production is subsequently improved.
In the embodiment of the invention, according to the peak daily gas production rate of the double-branch U-shaped well, the double-branch U-shaped well is sequentially determined as a first type well, a second type well or a third type well, and the method comprises the following steps:
according to the peak daily gas production database, according to a preset well number proportion, setting a high-low threshold value for dividing the peak gas production;
and determining the first type well, the second type well or the third type well by using the high-low threshold value.
Wherein, the preset well number proportion is about 25%, 50% and 25%.
In order to accurately judge whether the sudden gas production rate reduction occurs in the double-branch U-shaped well, the method further comprises the following steps:
analyzing the change characteristics of the peak daily gas production of the double-branch U-shaped well according to the peak daily gas production database;
and (4) making an identification standard of sudden gas production rate reduction according to the analysis result, and accurately determining whether the sudden gas production rate reduction occurs in the double-branch U-shaped well or not by using the identification standard.
Based on the same inventive concept, the embodiment of the invention also provides a device for improving the gas production of the double-branch U-shaped well, which is described in the following embodiment. The principle of the device for improving the gas production of the double-branch U-shaped well is similar to that of the method for improving the gas production of the double-branch U-shaped well, so the implementation of the device for improving the gas production of the double-branch U-shaped well can refer to the implementation of the method for improving the gas production of the double-branch U-shaped well, and repeated parts are not described again. The term "unit" or "module" used hereinafter may implement software, hardware, or a combination of both of predetermined functions. Although the means described in the following embodiments may preferably be implemented in software, implementations in software, hardware or a combination of both are also possible and contemplated.
The embodiment of the invention provides a device for improving the gas production rate of a double-branch U-shaped well, as shown in the attached figure 8, the device comprises:
the gas production rate obtaining module 201 is used for establishing a daily gas production rate database of the double U-shaped wells;
the judging module 202 is used for sequentially determining the double-branch U-shaped well as a first type well, a second type well or a third type well according to the daily peak gas production rate of the double-branch U-shaped well and analyzing the sudden drop condition of the gas production rate;
the first processing module 203 is used for flushing the horizontal branch of the first type well or the second type well with suddenly reduced gas production rate if the horizontal branch is completed by adopting a slotted screen pipe, and drilling the horizontal branch to be in butt joint with the vertical production well if the horizontal branch is not completed by adopting the slotted screen pipe;
the second processing module 204, for the third type of well, will drill the horizontal branch to interface with the vertical producer well depending on the geological conditions.
By using the method, the formation fluid in the reservoir can be discharged into the vertical production well through the horizontal branch, so that the continuous pressure relief of the reservoir is realized, and the gas production rate of the double-branch U-shaped well is further improved.
The embodiment of the present invention further provides a computer device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, and the processor implements the above method when executing the computer program.
An embodiment of the present invention further provides a computer-readable storage medium, in which a computer program for executing the above method is stored.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (7)
1. A method for improving gas production of a double-branch U-shaped well is characterized by comprising the following steps:
establishing a daily gas production database of double U-shaped wells;
determining the double-branch U-shaped well as a first type well, a second type well or a third type well in sequence according to the daily gas production rate of the peak value of the double-branch U-shaped well, and analyzing the sudden drop condition of the gas production rate;
for the first type well or the second type well with suddenly reduced gas production, if the horizontal branch of the first type well or the second type well is completed by adopting a slotted screen pipe, the horizontal branch is washed, and if the horizontal branch of the second type well is not completed by adopting the slotted screen pipe, the drilled horizontal branch is butted with the vertical production well;
for the third type of well, the additional drilling of the horizontal branch is docked with the vertical production well, depending on the geological conditions.
2. The method of claim 1, further comprising:
and carrying out statistical analysis on the parameters of the double U-shaped wells in the gas field, and establishing an evaluation standard of the geological and well drilling and completion parameters.
3. The method of claim 1, wherein the determining the double-branch U-shaped well as the first type well, the second type well or the third type well in sequence according to the peak daily gas production rate of the double-branch U-shaped well comprises:
according to the peak daily gas production database, according to a preset well number proportion, setting a high-low threshold value for dividing the peak gas production;
and determining that the double U-shaped wells are the first type well, the second type well or the third type well by using the high and low thresholds.
4. The method of claim 1, further comprising:
analyzing the change characteristics of the peak daily gas production of the double-branch U-shaped well according to the peak daily gas production database;
and (4) making an identification standard of sudden gas production rate reduction according to the analysis result, and accurately determining whether the sudden gas production rate reduction occurs in the double-branch U-shaped well or not by using the identification standard.
5. The utility model provides an improve device of two U type well gas production, its characterized in that includes:
the gas production rate acquisition module is used for establishing a daily gas production rate database of the double-branch U-shaped well;
the judging module is used for sequentially determining the double-branch U-shaped well as a first type well, a second type well or a third type well according to the daily gas production rate of the peak value of the double-branch U-shaped well and analyzing the sudden drop condition of the gas production rate;
the first processing module is used for washing the horizontal branch of the first type well or the second type well with suddenly reduced gas production rate if the horizontal branch is completed by adopting the slotted screen pipe, and drilling the horizontal branch to be in butt joint with the vertical production well if the horizontal branch is not completed by adopting the slotted screen pipe;
and the second processing module is used for butting the drilled horizontal branch with the vertical production well according to the geological conditions for the third type of well.
6. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the method of any one of claims 1 to 4 when executing the computer program.
7. A computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program for executing the method of any one of claims 1 to 4.
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