CN111779468A - Horizontal well inclined shaft section vortex water drainage gas production device and water drainage gas production method - Google Patents
Horizontal well inclined shaft section vortex water drainage gas production device and water drainage gas production method Download PDFInfo
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- CN111779468A CN111779468A CN202010375437.9A CN202010375437A CN111779468A CN 111779468 A CN111779468 A CN 111779468A CN 202010375437 A CN202010375437 A CN 202010375437A CN 111779468 A CN111779468 A CN 111779468A
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 45
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims description 23
- 239000007788 liquid Substances 0.000 claims abstract description 98
- 238000000034 method Methods 0.000 claims abstract description 24
- 238000011084 recovery Methods 0.000 claims abstract description 24
- 238000009434 installation Methods 0.000 claims description 15
- 238000005191 phase separation Methods 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 75
- 230000000694 effects Effects 0.000 description 7
- 239000012071 phase Substances 0.000 description 6
- 238000000926 separation method Methods 0.000 description 6
- 238000013461 design Methods 0.000 description 5
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
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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
- E21B43/12—Methods or apparatus for controlling the flow of the obtained fluid to or in wells
- E21B43/121—Lifting well fluids
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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
- E21B43/34—Arrangements for separating materials produced by the well
- E21B43/38—Arrangements for separating materials produced by the well in the well
Abstract
The invention provides a horizontal well inclined shaft section vortex drainage gas production device and a drainage gas production method. The drainage and gas production tool with the vortex principle is preferably installed on the section of the horizontal well inclined shaft section with the liquid carrying difficulty, so that one-stage or multi-stage vortex drainage and gas production is realized. By utilizing the vortex principle, the gas-liquid two-phase separation motion is realized, the friction force between two phases is reduced, and the problems that the horizontal well is easy to form slug flow at the inclined shaft section, the gas-liquid slippage is serious, the pressure drop loss is large, and the liquid carrying capacity is poor are solved. The horizontal well method for the drainage gas recovery process is wide in application range and low in cost, and can be used together with other drainage gas recovery measures in the later stage.
Description
Technical Field
The invention relates to the technical field of natural gas exploitation, in particular to a horizontal well inclined shaft section vortex water drainage gas production device and a water drainage gas production method.
Background
The method is limited by a special well body structure of the horizontal well, and the biggest difficulty of the horizontal well in the drainage and gas recovery effect except the limitation of self productivity is serious slippage loss of liquid at an inclined well section, difficulty in carrying liquid and high required critical liquid carrying flow. At present, the horizontal well drainage gas recovery process mainly comprises foam drainage gas recovery, plunger drainage gas recovery and speed string drainage gas recovery, but the problem of serious slippage loss of an inclined well section of a horizontal well cannot be solved well by any process. Because the application effect of the existing technical measures in the horizontal well is poor, once accumulated liquid in a shaft is more difficult to discharge, a new technology needs to be searched aiming at the problems of serious liquid slippage loss and high liquid carrying difficulty of the inclined shaft section of the horizontal well. Research and research show that the underground vortex drainage gas production process is applied to a vertical well at present, the friction force between two phases is reduced by realizing the separation motion of gas and liquid phases, the liquid carrying capacity of a gas well is improved, and a series of vortex tools such as a DX (full duplex X) series vortex tool, an underground self-operated forced vortex drainage gas production device, a jet vortex drainage gas production device, a multi-spiral drainage gas production device and the like are formed.
Disclosure of Invention
In order to solve the problems of serious liquid slippage loss and difficult liquid carrying of the inclined shaft section of the horizontal well, the invention provides a horizontal well inclined shaft section vortex water drainage gas production device and a water drainage gas production method. Meanwhile, a corresponding process design method is formed aiming at the process, one-stage or multi-stage vortex drainage gas recovery is designed according to the position and the length of a pipe section which needs to solve the problem of difficult liquid carrying of the horizontal well, relay drainage gas recovery is realized, liquid is lifted from a wellhead, and the problems of serious liquid slippage loss and difficult liquid carrying of the inclined well section of the horizontal well are solved.
The technical scheme adopted by the invention is as follows:
the utility model provides a horizontal well inclined shaft section vortex drainage gas production device, is including establishing the oil pipe in the horizontal well and establishing the vortex instrument in the oil pipe, the vortex instrument be a plurality of, a vortex instrument of bottommost is located the corner of horizontal well vertical section and horizontal segment.
The distance between two adjacent eddy-current tools is less than or equal to the effective action distance of the previous eddy-current tool positioned below the two eddy-current tools, i.e. dn-1Must satisfy dn-1≤LnWherein L isnFor the effective working distance of the selected nth tool in its installation position, dn-1Is the installation distance between the nth selected tool and the (n-1) th selected tool.
The spiral angle of the previous stage of the eddy current tool is larger than that of the next stage.
The total action distance for installing the vortex tool is not less than the determined length of the pipe section with difficult liquid carrying of the inclined shaft section of the horizontal well.
The vortex tool is in a trapezoidal, rectangular or circular spiral diversion rib shape, the height of a spiral tie of the vortex tool is 10-15mm, the width of each wing is 10mm, and the spiral angle is 45-65 degrees.
Vortex instrument be three, including one-level vortex instrument, second grade vortex instrument and tertiary vortex instrument, one-level vortex instrument, second grade vortex instrument and tertiary vortex instrument from the bottom up arrange in proper order.
The second-level vortex tool is located above the horizontal well deflecting point, and the first-level vortex tool is located below the horizontal well deflecting point.
A water drainage and gas recovery method of a horizontal well inclined well section vortex water drainage and gas recovery device comprises the following specific steps:
selecting a horizontal well which needs to solve the problem of serious slippage loss of an inclined well section and is difficult to carry liquid;
determining the length and the deepest sinking position of a pipe section which is most difficult to carry liquid in the inclined shaft section, and determining the pipe section provided with the vortex tool;
selecting a vortex tool;
determining the effective acting distance of the eddy current tool, and determining the installation position and number of the eddy current tool;
and step five, installing an eddy current tool and starting production.
And in the fourth step, the deepest descending position obtained in the second step is used as the position of the first-stage vortex tool to obtain the speed of an airflow inlet and the maximum speed of a vortex gas phase, the action distance of the first-stage vortex tool is determined through a vortex tool model, a second-stage vortex tool is installed within the action distance of the first-stage vortex tool to obtain the airflow speed of the second-stage vortex tool, the action distance of the second-stage vortex tool is determined, and a third-stage vortex tool is installed within the distance until the gas well volume at the action distance of the uppermost vortex tool reaches the required critical liquid carrying flow rate, and the tool does not need to be installed again.
The total action distance for installing the vortex tool is not less than the length of the determined pipe section with difficult liquid carrying of the inclined shaft section of the horizontal well, namely HO-Hc≤Ln+dn-1+.....+d1In which H is0The well depth is the position where the first-stage vortex tool is installed, and Hc is the position where the gas quantity of the gas well in the shaft is larger than the required critical liquid carrying flow of the shaft.
The invention has the beneficial effects that:
the invention utilizes the obvious advantages of the vortex tool in the inclined shaft compared with the conventional straight shaft to realize the gas-liquid separation of the horizontal inclined shaft section to form gas-liquid spiral flow, and forms a liquid film boundary layer on the wall of the oil pipe, thereby effectively reducing the wall friction, reducing the pressure drop loss of liquid conveying, and effectively solving the problems of serious liquid slippage loss and high liquid carrying difficulty of the existing horizontal well in the inclined shaft section.
The invention provides a process design method for forming a set of system aiming at the vortex drainage gas recovery at the inclined shaft section of the horizontal well, which can fully play the role of a vortex tool and ensure the efficiency of the drainage gas recovery process.
The vortex flow tool can be used only by well opening production after the vortex flow tool is installed, no moving part is needed, manual independent operation is not needed, labor cost is not increased, and later maintenance is not needed.
The invention can carry liquid only by the self-ability of the gas well, thereby reducing the material and energy loss caused by external intervention and avoiding the potential pollution to the environment.
The existing underground vortex drainage gas production tool carries out throwing and fishing construction through a steel wire without lifting an oil pipe.
The following will be further described with reference to the accompanying drawings.
Drawings
Fig. 1 is a schematic view of a tool for realizing drainage and gas production of a multi-stage vortex tool after the vortex tool is installed in a horizontal well inclined section shaft.
FIG. 2 is a diagram of liquid carrying flow rate of inclined well sections of different oil pipe sizes of a horizontal well (pressure 5MPa and temperature 40 ℃).
FIG. 3 is a key structure of the spiral blade part of the vortex tool, wherein (a) is a schematic diagram of the position of a belt pitch, and (b) is a schematic diagram of the width of a belt wing.
FIG. 4 is a chart of eddy current tool working distance at different inclination angles.
FIG. 5 shows the distribution of fluid carrying flow in a G1 well deviation interval.
In the figures, the reference numbers are: 1. a primary vortex tool; 2. a secondary vortex tool; 3. a tertiary vortex tool.
Detailed Description
Example 1:
aiming at solving the problems that the prior art can not solve the problems that the liquid accumulation is serious and the effective drainage gas production is realized in the inclined shaft section of the horizontal well, the invention provides a vortex drainage gas production device and a drainage gas production method for the inclined shaft section of the horizontal well, which are shown in figures 1-5. Meanwhile, a corresponding process design method is formed aiming at the process, one-stage or multi-stage vortex drainage gas recovery is designed according to the position and the length of a pipe section which needs to solve the problem of difficult liquid carrying of the horizontal well, relay drainage gas recovery is realized, liquid is lifted from a wellhead, and the problems of serious liquid slippage loss and difficult liquid carrying of the inclined well section of the horizontal well are solved.
The utility model provides a horizontal well inclined shaft section vortex drainage gas production device, is including establishing the oil pipe in the horizontal well and establishing the vortex instrument in the oil pipe, the vortex instrument be a plurality of, a vortex instrument of bottommost is located the corner of horizontal well vertical section and horizontal segment.
The invention installs a drainage and gas production tool with a vortex principle at the inclined shaft section of the horizontal well, realizes gas-liquid two-phase separation movement by utilizing the vortex movement principle, and reduces the friction force between two phases. Meanwhile, a corresponding process design method is formed aiming at the process, one-stage or multi-stage vortex drainage gas recovery is designed according to the position and the length of a pipe section which needs to solve the problem of difficult liquid carrying of the horizontal well, relay drainage gas recovery is realized, liquid is lifted from a wellhead, and the problems of serious liquid slippage loss and difficult liquid carrying of the inclined well section of the horizontal well are solved.
Example 2:
based on embodiment 1, in this embodiment, the distance between two adjacent eddy current tools is less than or equal to the effective action distance of the previous eddy current tool positioned below the two adjacent eddy current tools, i.e. dn-1Must satisfy dn-1≤LnWherein L isnFor the effective working distance of the selected nth tool in its installation position, dn-1Is the installation distance between the nth selected tool and the (n-1) th selected tool.
Preferably, the helix angle of the previous stage of the swirling tool is greater than the helix angle of the subsequent stage.
Preferably, the total action distance for installing the vortex tool is not less than the determined length of the pipe section with difficult liquid carrying of the inclined shaft section of the horizontal well.
Preferably, the vortex tool is in a trapezoidal, rectangular or circular spiral diversion rib shape, the height of a spiral tie of the vortex tool is 10-15mm, the width of a wing is 10mm, and the spiral angle is 45-65 degrees.
Preferably, the vortex instrument be three, including one-level vortex instrument 1, second grade vortex instrument 2 and tertiary vortex instrument 3, one-level vortex instrument 1, second grade vortex instrument 2 and tertiary vortex instrument 3 from the bottom up arrange in proper order.
Preferably, the second-stage vortex tool 2 is located above a horizontal well deflection point, and the first-stage vortex tool 1 is located below the horizontal well deflection point.
A water drainage and gas recovery method of a horizontal well inclined well section vortex water drainage and gas recovery device comprises the following specific steps:
selecting a horizontal well which needs to solve the problem of serious slippage loss of an inclined well section and is difficult to carry liquid;
determining the length and the deepest sinking position of a pipe section which is most difficult to carry liquid in the inclined shaft section, and determining the pipe section provided with the vortex tool;
selecting a vortex tool;
determining the effective acting distance of the eddy current tool, and determining the installation position and number of the eddy current tool;
and step five, installing an eddy current tool and starting production.
And in the fourth step, the deepest descending position obtained in the second step is used as the position of the first-stage vortex tool 1 to obtain the speed of an airflow inlet and the maximum speed of a vortex gas phase, the action distance of the first-stage vortex tool is determined through a vortex tool model, the second-stage vortex tool 2 is installed within the action distance of the first-stage vortex tool to obtain the airflow speed of the second-stage vortex tool 2, the action distance of the second-stage vortex tool 2 is determined, and the third-stage vortex tool 3 is installed within the distance until the gas well volume at the action distance of the uppermost vortex tool reaches the required critical liquid carrying flow volume, and tools do not need to be installed again.
Preferably, the total action distance for installing the vortex tool is not less than the determined length of the pipe section with difficult liquid carrying of the horizontal well inclined shaft section, namely HO-Hc≤Ln+dn-1+.....+d1In which H is0The well depth is the position where the first-stage vortex tool is installed, and Hc is the position where the gas quantity of the gas well in the shaft is larger than the required critical liquid carrying flow of the shaft.
When the accumulated liquid in the inclined pipeline is removed by the airflow, the spiral gas-liquid separation flow can better discharge the accumulated liquid in the pipeline compared with the common gas-liquid mixed axial flow, and the common axial flow is difficult to obtain a better effect. The smaller the inclination angle of the pipeline is, the better the gas-liquid separation effect of the vortex flow state is, and the longer the spiral distance is. Thus, the vortex tool provides significant drainage advantages in inclined pipe sections over conventional vertical wells.
The water drainage gas recovery method comprises the following steps:
the method comprises the following steps of firstly, selecting a horizontal well which needs to solve the problem that the slippage loss of an inclined well section seriously carries liquid difficultly, wherein the well needs to meet the application conditions of the process, and the process can be ensured to effectively play a role. The specific production conditions are as follows: the casing pressure of the horizontal well is not less than 5MPa, the daily gas production is 0.55-1.0 times of the liquid carrying flow, and the water-gas ratio<50m3/104m3。
And secondly, determining continuous liquid carrying flow and the position which is most difficult to carry liquid required by each position of the inclined shaft section of the horizontal well by combining the selected well condition of the horizontal well and utilizing a liquid carrying prediction model of the horizontal well. And determining the length S and the position of a pipe section which needs the horizontal well and is difficult to carry liquid by combining the production condition of the gas well and the liquid carrying capacity.
For example, according to a liquid drop carrying model of the horizontal well based on angle correction by Belfroid et al, see formula (1), the required continuous liquid carrying flow pattern amount of the horizontal well at each position is calculated by combining the well condition of the gas well, as shown in fig. 2.
According to the liquid carrying prediction result, the critical liquid carrying gas quantity required by the horizontal well with the well deflection of about 35 degrees is the highest and is the position which is the most difficult to carry, and the descending position of the vortex tool is at least below the position. The critical gas carrying capacity required by the gas well with the well section with the well inclination angle of about 0-75 degrees is higher than that required by a vertical well under the same pressure and temperature conditions. And then the liquid carrying amount is obviously reduced along with the increase of the well inclination angle until the well inclination angle is close to horizontal flow. Therefore, the slippage loss of 0-75 degrees is difficult to carry liquid seriously, and the tool can play a good effect when being installed at the position of a horizontal well inclined shaft section with the well inclination angle of 75 degrees.
Thirdly, selecting a vortex tool which can be effectively applied to the inclined shaft section of the selected horizontal well; the vortex tool selected by drainage and gas production can be a currently common trapezoidal, rectangular or circular spiral diversion rib-shaped vortex tool, wherein the height of a spiral tie is 10-15mm, the width of a wing is 10mm, and the spiral angle is 45-65 degrees. The spiral angle of the first-stage spiral flow is selected to be 45 degrees, and the spiral angle of the front stage of the multi-stage spiral flow tool is larger than that of the rear stage, so that the same strength of the vortex flow is ensured. Meanwhile, the eddy current tool is required to be installed without a gap with a shaft, so that the eddy current effect is improved.
And fourthly, determining the effective acting distance L of the selected tool in the inclined shaft section of the selected horizontal well according to the well condition of the selected horizontal well and the tool parameters. And according to the evaluation result of the acting distance of the vertical well eddy tool, further correcting the inclination angle to obtain an acting distance model of the eddy tool under the inclined well condition. An example of a plot of the working distance of the eddy current tool under different conditions using the eddy current model is shown in figure 4.
Wherein, Vin-is the inlet gas flow velocity; vsTo achieve a stable gas phase maximum velocity;
and fifthly, determining the positions and the number of the selected vortex tools to be installed on the selected pipe section according to the effective action distance L of the selected tools on the selected horizontal well inclined shaft section and the well conditions. In order to achieve the best vortex effect and realize relay drainage and gas production, the principle of selecting the number n and the positions of tools selected for installing the pipe section is as follows:
1) the first-stage eddy current tool is set in the position of 0 point, the determined M point at the lowest end position of the pipe section needing the eddy current tool to be installed and the determined N point at the deepest set-in position of the available eddy current tool are determined, if the depth of the M point is greater than that of the N point, the depth of the set-in position of the first-stage eddy current tool is determined according to the depth of the eddy current tool, namely H0≤HN≤HM(ii) a If the depth of M is less than that of N, the lower depth of the eddy current tool is between M and N, i.e. HM≤H0≤HN。
2) It must be satisfied that the distance between two adjacent eddy current tools is less than or equal to the effective action distance of the previous eddy current tool, i.e. dn-1Must satisfy dn-1≤LnWherein L isnFor the effective working distance of the selected nth tool in its installation position, dn-1Is the installation distance between the nth selected tool and the (n-1) th selected tool.
3) The total action distance for installing the vortex tool is not less than the determined length of the pipe section with difficult liquid carrying of the horizontal well, namely HO-Hc≤Ln+dn-1+.....+d1In which H is0The well depth is the position where the first-stage vortex tool is installed, and Hc is the position where the gas quantity of the gas well in the shaft is larger than the required critical liquid carrying flow of the shaft.
The invention utilizes the obvious advantages of the vortex tool in the inclined shaft compared with the conventional straight shaft to realize the gas-liquid separation of the horizontal inclined shaft section to form gas-liquid spiral flow, and forms a liquid film boundary layer on the wall of the oil pipe, thereby effectively reducing the wall friction, reducing the pressure drop loss of liquid conveying, and effectively solving the problems of serious liquid slippage loss and high liquid carrying difficulty of the existing horizontal well in the inclined shaft section. The invention can carry liquid only by the self-ability of the gas well, thereby reducing the material and energy loss caused by external intervention and avoiding the potential pollution to the environment.
Example 3:
based on the embodiment 1 and the embodiment 2, the embodiment selects the horizontal well which needs to solve the problem of serious slippage loss and difficult liquid carrying of the inclined shaft section,
at a certain levelGas well G1 well producing 4 × 10 gas4m3D, water-gas ratio of 20m3/104m3The well head oil pressure is 2MPa, the casing pressure is 5MPa, the bottom hole pressure is 6.5MPa, the relative density of natural gas is 0.67, and the density of water is 998.2kg/m3The inner diameter of the oil pipe of the well is 0.062m, the well depth of a deflecting point is 3000m, the well depth of a window entry point is 3785m, and the bottom temperature is 80 ℃.
Combining with well selection conditions, determining the critical liquid carrying flow rate of the horizontal well in the inclined shaft section according to the casing pressure and the horizontal gas ratio, and combining with a liquid carrying prediction model, wherein the maximum liquid carrying flow rate of the well is 5.5 × 104m3Gas well production of 4 × 104m3The flow rate/d is 0.727 times of the maximum liquid carrying flow rate, and the well selection condition is met.
2. And determining the length of the pipe section which is most difficult to carry liquid in the inclined shaft section and the deepest descending position.
According to the inclined well section liquid carrying distribution shown in fig. 4, the required liquid carrying flow of the well is the largest at the inclination angle of 35 degrees, the liquid carrying flow rapidly drops after the inclination angle of 80 degrees, the inclination angle of the lowering position is more than 80 degrees, and the well section with liquid carrying difficulty is the well section from the deflecting point to the inclination angle of 80 degrees. The current position of the vortex tool can reach the horizontal section, and the running limit is not existed. The deepest point of the well may be set at a well angle of 80 deg., where the well is at a depth of 3697.6m.
3. Selective eddy current tool
Selecting a throwing-fishing type trapezoidal vortex tool, wherein the height of a spiral tie is 15mm, the width of a wing is 10mm, and the spiral angle is 45-65 degrees.
4. The effective active distance L of the eddy current tool is determined,
the deepest descending position of the vortex tool is determined to be the well depth 3697.6m, and the lower depth position of the first-stage vortex tool is determined to be 3697.6m. The gas inlet velocity here is 10.56m/s, the maximum velocity of the vortex gas phase is 5.28m/s, and the working distance of the first stage vortex tool is 170.2m according to the vortex tool model, so that the second stage of the vortex tool is located at the well depth of 3526.2m, the gas inflow velocity here is 10.89m/s, the working distance of the vortex tool is 210.3m, and therefore the installation position of the third stage vortex tool is 3316m, the gas inlet velocity here is 11.26m/s, the left-right distance of the vortex tool is 264.5m, and the gas well gas volume at the working distance of the third stage vortex tool has reached the critical liquid carrying flow rate here, and the tool does not need to be installed again.
5. The installation stage number and the number of the eddy current tool are comprehensively determined.
And determining the installation stage number of the eddy current tool to be three stages according to the determined effective acting distance of the eddy current tool, wherein the installation positions are respectively at the well depths of 3697.6m, 3526.2m and 3316m, and the spiral angles of the three stages of the eddy current tool are 45 degrees, 55 degrees and 60 degrees in sequence.
The invention utilizes the obvious advantages of the vortex tool in the inclined shaft compared with the conventional straight shaft to realize the gas-liquid separation of the horizontal inclined shaft section to form gas-liquid spiral flow, and forms a liquid film boundary layer on the wall of the oil pipe, thereby effectively reducing the wall friction, reducing the pressure drop loss of liquid conveying, and effectively solving the problems of serious liquid slippage loss and high liquid carrying difficulty of the existing horizontal well in the inclined shaft section. The invention provides a process design method for forming a set of system aiming at the vortex drainage gas recovery at the inclined shaft section of the horizontal well, which can fully play the role of a vortex tool and ensure the efficiency of the drainage gas recovery process. The vortex flow tool can be used only by well opening production after the vortex flow tool is installed, no moving part is needed, manual independent operation is not needed, labor cost is not increased, and later maintenance is not needed. The invention can carry liquid only by the self-ability of the gas well, thereby reducing the material and energy loss caused by external intervention and avoiding the potential pollution to the environment. The existing underground vortex drainage gas production tool carries out throwing and fishing construction through a steel wire without lifting an oil pipe.
The above description is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims. The components and structures of the present embodiments that are not described in detail are well known in the art and do not constitute essential structural elements or elements.
Claims (10)
1. The utility model provides a horizontal well inclined shaft section vortex drainage gas production device which characterized in that: the horizontal well vortex flow tool comprises an oil pipe arranged in a horizontal well and a plurality of vortex flow tools arranged in the oil pipe, wherein one vortex flow tool at the lowest end is positioned at the corner of a vertical section and a horizontal section of the horizontal well.
2. The horizontal well inclined shaft section vortex water drainage gas production device according to claim 1, which is characterized in that: the distance between two adjacent eddy-current tools is less than or equal to the effective action distance of the previous eddy-current tool positioned below the two eddy-current tools, i.e. dn-1Must satisfy dn-1≤LnWherein L isnFor the effective working distance of the selected nth tool in its installation position, dn-1Is the installation distance between the nth selected tool and the (n-1) th selected tool.
3. The horizontal well inclined shaft section vortex water drainage gas production device according to claim 2, characterized in that: the spiral angle of the previous stage of the eddy current tool is larger than that of the next stage.
4. The horizontal well inclined shaft section vortex water drainage gas production device according to claim 2, characterized in that: the total action distance for installing the vortex tool is not less than the determined length of the pipe section with difficult liquid carrying of the inclined shaft section of the horizontal well.
5. The horizontal well inclined shaft section vortex water drainage gas production device according to claim 1, which is characterized in that: the vortex tool is in a trapezoidal, rectangular or circular spiral diversion rib shape, the height of a spiral tie of the vortex tool is 10-15mm, the width of each wing is 10mm, and the spiral angle is 45-65 degrees.
6. The horizontal well inclined shaft section vortex water drainage gas production device according to claim 1, which is characterized in that: vortex instrument be three, including one-level vortex instrument (1), second grade vortex instrument (2) and tertiary vortex instrument (3), one-level vortex instrument (1), second grade vortex instrument (2) and tertiary vortex instrument (3) from the bottom up arrange in proper order.
7. The horizontal well inclined shaft section vortex water drainage gas production device according to claim 6, characterized in that: the second-stage vortex tool (2) is located above a horizontal well deflecting point, and the first-stage vortex tool (1) is located below the horizontal well deflecting point.
8. The water drainage and gas recovery method of the horizontal well inclined shaft section vortex water drainage and gas recovery device according to any one of claims 1 to 7, characterized in that: the method comprises the following specific steps:
selecting a horizontal well which needs to solve the problem of serious slippage loss of an inclined well section and is difficult to carry liquid;
determining the length and the deepest sinking position of a pipe section which is most difficult to carry liquid in the inclined shaft section, and determining the pipe section provided with the vortex tool;
selecting a vortex tool;
determining the effective acting distance of the eddy current tool, and determining the installation position and number of the eddy current tool;
and step five, installing an eddy current tool and starting production.
9. The horizontal well inclined shaft section vortex water drainage gas production method according to claim 8, characterized in that: and in the fourth step, the deepest descending position obtained in the second step is used as the position of the first-stage vortex tool (1) to obtain the speed of an airflow inlet and the maximum speed of a vortex gas phase, the action distance of the first-stage vortex tool is determined through a vortex tool model, the second-stage vortex tool (2) is installed within the action distance of the first-stage vortex tool to obtain the airflow speed of the second-stage vortex tool (2), the action distance of the second-stage vortex tool (2) is determined, and the third-stage vortex tool (3) is installed within the distance until the gas well volume at the action distance of the uppermost vortex tool reaches the critical liquid carrying flow required by the position, and the tool does not need to be installed again.
10. The horizontal well slant well section eddy current drainage gas production method according to claim 9, characterized in that: the total action distance for installing the vortex tool is not less than the length of the determined pipe section with difficult liquid carrying of the inclined shaft section of the horizontal well, namely HO-Hc≤Ln+dn-1+ .....+d1In which H is0The well depth is the position where the first-stage vortex tool is installed, and Hc is the position where the gas quantity of the gas well in the shaft is larger than the required critical liquid carrying flow of the shaft.
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