CN112576233A - Gas-liquid-solid separation device in shaft and design method thereof - Google Patents
Gas-liquid-solid separation device in shaft and design method thereof Download PDFInfo
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- CN112576233A CN112576233A CN202011462246.2A CN202011462246A CN112576233A CN 112576233 A CN112576233 A CN 112576233A CN 202011462246 A CN202011462246 A CN 202011462246A CN 112576233 A CN112576233 A CN 112576233A
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- 239000007787 solid Substances 0.000 title claims abstract description 56
- 238000000926 separation method Methods 0.000 title claims abstract description 50
- 238000000034 method Methods 0.000 title claims abstract description 19
- 239000007788 liquid Substances 0.000 claims abstract description 89
- 230000000149 penetrating effect Effects 0.000 claims abstract description 4
- 239000002245 particle Substances 0.000 claims description 21
- 239000004576 sand Substances 0.000 claims description 15
- 210000002445 nipple Anatomy 0.000 claims description 14
- 238000004364 calculation method Methods 0.000 claims description 10
- 239000003245 coal Substances 0.000 claims description 10
- 238000004519 manufacturing process Methods 0.000 claims description 8
- 238000005086 pumping Methods 0.000 claims description 6
- 238000006073 displacement reaction Methods 0.000 claims description 4
- 230000008878 coupling Effects 0.000 claims description 2
- 238000010168 coupling process Methods 0.000 claims description 2
- 238000005859 coupling reaction Methods 0.000 claims description 2
- 239000003921 oil Substances 0.000 description 30
- 239000007789 gas Substances 0.000 description 28
- 230000000694 effects Effects 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 238000000605 extraction Methods 0.000 description 5
- 239000012530 fluid Substances 0.000 description 5
- 238000007599 discharging Methods 0.000 description 4
- 239000003129 oil well Substances 0.000 description 3
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- 239000011435 rock Substances 0.000 description 2
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- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
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Abstract
The invention provides a gas-liquid-solid separation device in a shaft, wherein the upper end of an outer pipe is assembled and connected with an upper joint through an outer buckle, and the upper end of the outer pipe is provided with a plurality of liquid inlet holes penetrating through the upper end of the outer pipe; the inner pipes are inserted into the outer pipes and are spaced from each other, and the upper ends of the inner pipes are assembled and connected with the upper joint through the inner buckles; the diameter-expanding short section is connected to the lower end of the inner pipe to be suspended in the outer pipe; the inner pipe, the expanding short section and the outer pipe together enclose an inner pipe annulus and an outer pipe annulus, and the inner pipe annulus and the outer pipe annulus meet the preset flow area; the flow area of the diameter-expanding short section is not less than that of an externally connected upper pump oil pipe; the lower joint is connected to the lower end of the outer pipe through a screw thread; the lower end of the lifting short section is inserted and connected to the upper end of the upper joint, and the oil pipe joint hoop is connected to the upper end of the lifting short section. The invention also provides a design method of the gas-liquid-solid separation device in the shaft. Compared with the prior art, the gas-liquid-solid separation device in the shaft has good reliability and long service life.
Description
Technical Field
The invention relates to the technical field of coal bed gas well extraction equipment, in particular to a gas-liquid-solid separation device in a shaft and a design method thereof.
Background
In order to ensure the normal operation of the coal bed gas well drainage equipment, avoid gas lock of gas inlet pump and sand blocking, various gas anchors and sand anchors are adopted. However, the problems of free gas entering the pump, pump gas lock and oil pipe cavitation at different degrees are still not completely avoided; solid particles enter the pump, so that the pump is blocked and still a main factor of pump detection is caused, and the reliability is poor. The gas anchor adopted by the oil well of general mechanical oil extraction is only suitable for the condition of low gas-liquid ratio, while most of coal-bed gas wells have gas-liquid ratio of hundreds or even thousands, and the general gas anchor is difficult to adapt. The oil well can carry the particles with certain particle sizes to a wellhead because the viscosity of crude oil is far greater than that of water, and the water produced by the coal bed gas is not beneficial to carrying the particles, so that the sand anchor which can be used in the oil well has poor effect in the coal bed gas well.
Therefore, there is a need for a new gas-liquid-solid separation device in a wellbore and a design method thereof to solve the above problems.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a gas-liquid-solid separation device in a shaft with good reliability and long service life and a design method thereof.
In order to solve the technical problem, the invention provides a gas-liquid-solid separation device in a shaft, which is applied between a drainage pump and a sand setting pipe of drainage equipment of a coal bed gas well, wherein the gas-liquid-solid separation device in the shaft comprises an oil pipe joint hoop, a lifting short section, an upper joint, an outer pipe, a night inlet hole, an inner pipe, an expanding short section and a lower joint;
the upper joint is in a hollow ring shape, and the lower end of the upper joint is provided with an outer buckle positioned on the outer side of the upper joint and an inner buckle positioned on the inner side of the upper joint;
the upper end of the outer pipe is assembled and connected with the upper joint through the outer buckle, and the upper end of the outer pipe is provided with a plurality of liquid inlet holes penetrating through the upper end of the outer pipe;
the inner pipe is inserted and accommodated in the outer pipe and spaced from the outer pipe, the upper end of the inner pipe is assembled and connected with the upper joint through the inner buckle, and the inner pipe is communicated with the upper joint;
the diameter expanding short section is connected to the lower end of the inner pipe to be suspended in the outer pipe, and the diameter expanding short section and the outer pipe are spaced;
the inner pipe, the diameter-expanding short section and the outer pipe together enclose an inner pipe annulus and an outer pipe annulus, and the inner pipe annulus and the outer pipe annulus meet a preset flow area so as to realize gas-liquid separation;
the flow area of the diameter-expanding short section is not less than that of an externally connected upper pump oil pipe, so that the flow rate of liquid at the position of the diameter-expanding short section is lower than that of liquid at any position of the externally connected upper pump oil pipe, and solid particles are settled and separated from the liquid;
the lower joint is connected to the lower end of the outer pipe through a screw thread;
the lower end of the lifting short section is inserted and connected to the upper end of the upper joint, and the oil pipe joint hoop is connected to the upper end of the lifting short section.
Preferably, the liquid inlet holes are distributed downwards from the position of the outer pipe, which is 150mm away from the upper joint, and the aperture and the number of the liquid inlet holes are designed to meet the requirement that the maximum overflowing speed of all the liquid inlet holes is lower than 0.2 m/s.
Preferably, the inner and outer tube annuluses satisfy the predetermined flow area, specifically include:
calculating by using the maximum theoretical displacement of a discharge and production pump externally connected with the gas-liquid-solid separation device in the shaft, so that the inner diameter of the inner pipe meets the requirement of the flow velocity of 2 m/s;
the outer diameter of the outer pipe is at least 6mm smaller than the inner diameter of a shaft casing externally connected with the gas-liquid-solid separation device in the shaft;
the inner and outer tube annular space meets the floating speed of the bubbles with the maximum liquid flow rate lower than 0.1mm in diameter;
the difference between the inner diameter of the outer pipe and the outer diameter of the diameter-expanding short section is larger than 10 mm;
the length of the outer pipe meets the condition that the effective separation volume of the inner pipe annulus and the outer pipe annulus is larger than the single suction volume of the drainage pump.
Preferably, the clearance distance between the lower end of the diameter-expanding short joint and the lower joint is at least 200 mm.
Preferably, the upper end of the upper joint is connected with the lifting sub and the tubing coupling, and the upper joint comprises:
the length of the lifting short section is 400mm, the diameter of the lifting short section is consistent with that of an externally connected upper pumping oil pipe, and the diameter of the oil pipe joint hoop is matched with that of the lifting short section.
The invention also provides a design method of the gas-liquid-solid separation device in the shaft, which comprises the following steps:
step S1, designing specification parameters of the outer pipe and the inner pipe:
bubble with pageThe floating speed is 0.2m/s, and the inner diameter of the outer pipe is DInner diameter of outer tubeThe unit: mm; the length of the outer pipe is LOuter tubeThe unit: m;
the outer diameter of the inner pipe is set as D based on the outer diameter of the external oil pipe of the pumpOuter diameter of inner pipeThe unit "mm; inner diameter of the inner tube is DInner diameter of inner tubeThe unit: mm; the length of the inner tube is LInner pipeThe unit: m;
the daily maximum output of the external drainage pump is set as Q, unit: m is3D; number of strokes is n, unit: the times are/min;
setting the aperture of the liquid inlet hole as d, unit: mm; the number of the holes is k, and the unit is one;
step S2, obtaining specification parameters of the outer tube and the inner tube:
taking the upward flow velocity of the liquid in the inner pipe as 2m/s to obtain:
Dinner diameter of inner tube＝3.84√Q (1)
According to the calculation result of the formula (1), selecting a proper inner pipe in the pipe sequence, and simultaneously determining the corresponding DOuter diameter of inner pipe；
And obtaining the following result according to the liquid descending flow velocity in the inner and outer tube annular space of 0.2 m/s:
Dinner diameter of outer tube＝√(147.44Q+DOuter diameter of inner pipe 2) (2)
Calculating the result according to formula (2) and using DOuter diameter of outer tubeSelecting a proper outer pipe in the pipe sequence under the condition that the inner diameter of the outer well casing is 6 mm;
on the basis that the aperture d of the liquid inlet hole is 8mm or 10mm, the flow speed of liquid entering the liquid inlet hole is less than 0.2m/s, and the method comprises the following steps:
k>147.44Q/d2 (3)
determining the total number of the liquid inlet holes by the multiple of the number of holes per circle according to the calculation result of the formula (3);
on the basis that the volume of the inner and outer tube annuluses is larger than the single-stroke pumping capacity of an external drainage pump, the effective separation length of the inner and outer tube annuluses is L:
L>884.6Q/n/(Dinner diameter of outer tube 2-DOuter diameter of inner pipe 2) (4)
Adding the length of the liquid inlet hole arrangement section to the L according to the calculation result of the formula (4) to obtain the minimum length L of the inner pipeInner pipe(ii) a Inner pipe length LInner pipe+ expanding nipple length + expanding nipple and lower joint clearance distance 0.2m as the minimum length L of the outer tubeOuter tube。
Compared with the prior art, the design method of the gas-liquid-solid separation device in the shaft and the designed gas-liquid-solid separation device in the shaft are characterized in that a plurality of liquid inlet holes are formed in the upper end of an outer pipe, an inner pipe is inserted into the outer pipe, the lower end of the inner pipe is connected with an expanding short section, the annular space between the outer pipe and the inner pipe is as large as possible, the downward flowing speed of liquid is reduced to be lower than the floating speed of bubbles in the annular space, and the bubbles are prevented from flowing downwards along with the liquid flowing downwards; the outer tube length is greater than external row and adopts the pump single suction volume in order to guarantee that interior outer tube annular space volume, and in the suction interval period, the bubble up flows out interior outer tube annular space with faster speed, plays the effect of gas-liquid thorough separation, avoids airlock and oil pipe cavitation to damage. The diameter-expanding nipple joint is connected to the lower end of the inner pipe, the overflowing area of the inner pipe is larger than that of the discharging and extracting pump and the upper end pipe column of the discharging and extracting pump, the upward flowing speed of fluid is lowest at the position, large particles are settled at the position and fall into the lower end sand settling pipe, the particles entering the pump along with the upward flowing of the fluid can not be settled on the pump at the position, and therefore the particles are prevented from being stuck on the pump. Utilize gas-liquid-solid three-phase density difference, set up reasonable flow space, make bubble floating velocity be faster than liquid downflow velocity, solid particle sinking velocity is faster than liquid upflow velocity, furthest separates out gas, solid particle from liquid, avoids the emergence of drainage pump gas lock or card pump trouble, the effectual gas-liquid-solid separator's in the pit shaft reliability and life that have improved.
Drawings
In order to make the content of the invention clearer, the drawings needed to be used in the description of the embodiments will be briefly described below, it being clear that the drawings in the following description are only some embodiments of the invention, and that other drawings can be derived by a person skilled in the art without inventive effort, wherein:
FIG. 1 is a schematic diagram of a gas-liquid-solid separation apparatus in a wellbore according to the present invention;
FIG. 2 is a block flow diagram of a method for gas-liquid-solid separation in a wellbore in accordance with the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, the invention provides a gas-liquid-solid separation device 100 in a shaft, which is applied between a drainage pump (not shown) and a sand setting pipe (not shown) of a coal bed gas well drainage device, wherein the gas-liquid-solid separation device 100 in the shaft comprises an oil pipe joint hoop 1, a lifting short section 2, an upper joint 3, an outer pipe 4, a night inlet hole 5, an inner pipe 6, an expanding short section 7 and a lower joint 8. This embodiment discharges water 40m daily3The gas-liquid-solid separation device matched with the drainage pump is taken as an example for detailed description:
the upper joint 2 is in a hollow ring shape, and the lower end of the upper joint 3 is provided with an outer buckle (not numbered) positioned on the outer side of the upper joint and an inner buckle (not numbered) positioned on the inner side of the upper joint.
The upper end of the outer pipe 4 is connected with the upper joint 3 through being buckled with the outer part, and the upper end of the outer pipe 4 is provided with a plurality of liquid inlet holes 5 penetrating through the outer pipe.
The inner pipe 6 is inserted and accommodated in the outer pipe 4 and spaced from each other, and the upper end of the inner pipe 6 is assembled and connected to the upper joint 3 through the inner buckle, so that the inner pipe 6 is communicated with the upper joint 3.
The diameter expanding short joint 7 is connected to the lower end of the inner pipe 6 to be suspended in the outer pipe 4, and the diameter expanding short joint 7 and the outer pipe 4 are spaced from each other.
The inner pipe 6, the diameter-expanding short section 7 and the outer pipe 4 jointly enclose an inner pipe annulus and an outer pipe annulus, and the inner pipe annulus and the outer pipe annulus meet the preset flow area so as to realize gas-liquid separation.
In this embodiment, specifically, the maximum theoretical displacement of the extraction pump externally connected to the gas-liquid-solid separation device 100 in the wellbore is used to calculate, so that the inner diameter of the inner pipe 6 satisfies the flow rate of 2m/s, and the flow rate of the inner pipe is calculated at the maximum theoretical displacement of the extraction pump, where 2m/s is a recognized economic flow rate of general liquid. The outer diameter of the outer pipe 4 is at least 6mm smaller than the inner diameter of a shaft casing which is externally connected with the gas-liquid-solid separation device 100 in the shaft, so as to meet the requirements of downhole operation specifications.
The inner and outer tube annular space meets the floating speed of the bubbles with the maximum liquid flow velocity lower than 0.1mm in diameter, and the effect of gas-liquid separation is achieved. The annular space formed by the inner wall of the outer pipe 4 and the outer wall of the inner pipe 6 is as large as possible, the maximum flow velocity of liquid is lower than the floating velocity of bubbles with the diameter of 0.5mm by 0.2m/s, and the minimum diameter of the bubbles which are desorbed from the shale and the coal rock in water is about 0.5mm by laboratory observation and analysis.
The difference between the inner diameter of the outer pipe 4 and the outer diameter of the diameter-expanding short section 7 is larger than 10mm, and sufficient falling space of annular sand grains is guaranteed.
The length of the outer pipe satisfies that the effective separation volume of the inner and outer pipe annuluses is larger than the single suction volume of the drainage pump, and in the suction interval period, bubbles flow out of the annuluses upwards at a higher speed, so that the effect of thorough gas-liquid separation is achieved, the cavitation damage of the gas lock and the oil pipe is avoided, and the reliability and the service life are effectively improved.
The flow area of the diameter-expanding short section 7 is not less than that of an externally connected upper pump oil pipe (not shown), so that the flow rate of liquid at the position of the diameter-expanding short section 7 is lower than that of liquid at any position of the externally connected upper pump oil pipe, solid particles are settled and separated from the liquid, and the effect of solid-liquid separation is achieved. Great particulate matter subsides here, falls into lower extreme sand setting pipe, can be here along with the particulate matter of fluid up flow admission pump, can not deposit on the pump, therefore avoided the particulate matter card pump. In this embodiment, the clearance between the lower end of the diameter-expanding short section 7 and the lower joint 8 is at least 200 mm.
The lower joint 8 is screwed to the lower end of the outer pipe 4. The lower end of the lower joint 8 is used for connecting a sand setting pipe.
The lower end of the lifting short section 2 is inserted into the upper end of the upper joint 3, and the oil pipe joint hoop sleeve 1 is connected to the upper end of the lifting short section 2. The upper end of the oil pipe joint hoop sleeve 1 is used for connecting a drainage pump.
The length of the lifting nipple 2 is 400mm, the diameter of the lifting nipple is consistent with that of an externally connected upper pumping oil pipe, and the diameter of the oil pipe joint hoop 1 is matched with that of the lifting nipple 2, so that the effect of hoisting the lifting nipple in a well is achieved.
The liquid inlet holes 5 are arranged downwards from the outer pipe 4 to the position 150mm away from the upper joint 3, and the aperture and the number of the liquid inlet holes 5 are designed to meet the requirement that the maximum overflowing speed of all the liquid inlet holes is lower than 0.2m/s, so that gas in the inner and outer pipe ring spaces can return to the outside of the outer pipe 4 while liquid is fed.
In the structure, the gas-liquid-solid three-phase density difference is utilized, the reasonable flowing space is set, the floating speed of bubbles is higher than the down flowing speed of liquid, the sinking speed of solid particles is higher than the up flowing speed of liquid, gas and solid particles are separated from the liquid to the maximum extent, the occurrence of gas lock or pump clamping faults of the drainage pump or the extraction pump is avoided, and the reliability and the service life of the gas-liquid-solid separation device 100 in the shaft are effectively improved.
Referring to fig. 1-2, the present invention further provides a method for designing the gas-liquid-solid separation device in a shaft according to the present invention.
The coal bed gas drainage and production is oil pipe drainage, and the oil sleeve annulus generates gas. In the air flow of the oil jacket ring, the air is influenced by the quick upward flow of the air body of the oil jacket ring, various complex flow states such as turbulent flow, circular flow, fog flow and the like can occur due to different gas-liquid ratios and different flow rates, and the gas and the liquid can be mixed together with any granularity. Once the liquid mixed with gas and solid enters the inner and outer tube annuluses of the gas-liquid-solid separator, the liquid is no longer influenced by the upward gas flow of the oil sleeve annulus, and small bubbles are quickly gathered into large bubbles, float on the upper parts of the inner and outer tube annuluses and return to the oil sleeve annulus.
Laboratory observation and analysis show that the minimum diameter of bubbles desorbed from the shale and the coal rock in water is about 0.5mm, and the floating speed is 0.2 m/s; the larger the bubble diameter, the higher the floating speed. Therefore, the floating speed of the bubbles of 0.2m/s is taken as the design basis, and the calculation design of the specific size of the gas-liquid-solid separation device is realized: the inner diameter of the outer pipe, the outer diameter of the inner pipe, the aperture and the number of the liquid inlet holes and the lengths of the inner pipe and the outer pipe are designed.
The water is drained by 40m day3The gas-liquid-solid separator matched with the drainage and production pump is taken as an example, and the method comprises the following steps:
step S1, designing specification parameters of the outer tube 4 and the inner tube 6:
typically the production casing has an internal diameter of 124mm and so an outer tube 4 of suitable size is selected at 118mm and below. Based on the floating speed of the bubbles of the leaf being 0.2m/s, the inner diameter of the outer tube is set as DInner diameter of outer tubeThe unit: mm; the length of the outer pipe is LOuter tubeThe unit: and m is selected.
The outer diameter of the inner pipe is set as D based on the outer diameter of the external oil pipe of the pumpOuter diameter of inner pipeThe unit "mm; inner diameter of the inner tube is DInner diameter of inner tubeThe unit: mm; the length of the inner tube is LInner pipeThe unit: and m is selected. The production tubing typically has an outer diameter of 73mm and so an appropriately sized inner tube 6 is selected at 73mm and below.
The daily maximum output of the external drainage pump is set as Q, unit: m is3D; number of strokes is n, unit: the times are/min;
setting the aperture of the liquid inlet hole 5 as d, unit: mm; the number of holes is k, unit: piece.
Step S2, obtaining specification parameters of the outer tube and the inner tube:
(1) taking the upward flow velocity of the liquid in the inner pipe 6 as 2m/s to obtain:
Dinner diameter of inner tube＝3.84√Q (1)
Selecting a suitable inner tube 6 from the sequence of tubes according to the calculation result of formula (1), and determining the corresponding DOuter diameter of inner pipe；
(2) And obtaining the following result according to the liquid descending flow velocity in the inner and outer tube annular space of 0.2 m/s:
Dinner diameter of outer tube＝√(147.44Q+DOuter diameter of inner pipe 2) (2)
Calculating the result according to formula (2) and using DOuter diameter of outer tubeSelecting a proper outer pipe 4 in the pipe sequence under the condition that the inner diameter of the outer well casing is 6 mm;
(3) on the basis that the aperture d of the liquid inlet hole 5 is 8mm or 10mm, the flow speed of liquid entering the liquid inlet hole is less than 0.2m/s, and the method comprises the following steps:
k>147.44Q/d2 (3)
determining the total number of the liquid inlet holes 5 by the times of the number of holes per circle according to the calculation result of the formula (3);
(4) on the basis that the volume of the inner and outer tube annuluses is larger than the single-stroke pumping capacity of an external drainage pump, the effective separation length of the inner and outer tube annuluses is L:
L>884.6Q/n/(Dinner diameter of outer tube 2-DOuter diameter of inner pipe 2) (4)
Adding the length of the liquid inlet hole arrangement section to the L according to the calculation result of the formula (4) to obtain the minimum length L of the inner pipeInner pipe(ii) a Inner pipe length LInner pipe+ expanding nipple length + expanding nipple and lower joint clearance distance 0.2m as the minimum length L of the outer tubeOuter tube。
According to the method, the water is drained by 40m day3The gas-liquid-solid separator matched with the drainage pump is taken as an example, and the gas-liquid sharing device in the well cylinder in the embodiment is as follows: the outer diameter of the inner tube is 36mm, the inner diameter of the inner tube is 28mm, and the length of the inner tube is 5.6 m; the length of the diameter-expanding short section is 215mm, the inner diameter of the diameter-expanding short section is 62mm, and the outer diameter of the diameter-expanding short section is 73 mm. The outer tube external diameter is 101.6mm, outer tube internal diameter 88.3mm, feed liquor hole diameter 10mm 6 x 11 (6 holes of every annular cross-section equipartition, stagger 30 and arrange 6 holes again at interval 40mm, 11 circles totally 66 holes), outer tube length 6m of outer tube (guarantee that the effective length of annular space gas-liquid separation is greater than 3.6 m). The lifting nipple and the oil pipe joint hoop are consistent with an external oil pipe with the external diameter of 73mm, and the lifting nipple is 400mm long.
When the device is used, the upper part of the gas-liquid sharing device in the shaft is connected with the drainage pump, and the lower part of the gas-liquid sharing device in the shaft is connected with the sand settling pipe and goes down to the designed well depth. After the drainage pump is pumped, the gas-liquid-solid separation device automatically plays a role, liquid enters the inner pipe annulus and the outer pipe annulus from the oil sleeve annulus through the liquid inlet hole 5 of the outer pipe 4, flows downwards, turns to the diameter-expanding short section 7, flows upwards, and enters the pump suction valve through the inner pipe 6 and the lifting short section 2; the gas is separated from the liquid in the inner and outer pipe annular space and returns to the oil sleeve annular space; solid particles are settled at the diameter-expanding short section 7 and enter the sand settling pipe. After the deposition of solid particles in the sand setting pipe is slow, when the pump discharge capacity is reduced, the pipe lifting column can clean the sand setting pipe, no other operation is needed in the operation process, the use is convenient, and the reliability is good.
Compared with the prior art, the design method of the gas-liquid-solid separation device in the shaft and the designed gas-liquid-solid separation device in the shaft are characterized in that a plurality of liquid inlet holes are formed in the upper end of an outer pipe, an inner pipe is inserted into the outer pipe, the lower end of the inner pipe is connected with an expanding short section, the annular space between the outer pipe and the inner pipe is as large as possible, the downward flowing speed of liquid is reduced to be lower than the floating speed of bubbles in the annular space, and the bubbles are prevented from flowing downwards along with the liquid flowing downwards; the outer tube length is greater than external row and adopts the pump single suction volume in order to guarantee that interior outer tube annular space volume, and in the suction interval period, the bubble up flows out interior outer tube annular space with faster speed, plays the effect of gas-liquid thorough separation, avoids airlock and oil pipe cavitation to damage. The diameter-expanding nipple joint is connected to the lower end of the inner pipe, the overflowing area of the inner pipe is larger than that of the discharging and extracting pump and the upper end pipe column of the discharging and extracting pump, the upward flowing speed of fluid is lowest at the position, large particles are settled at the position and fall into the lower end sand settling pipe, the particles entering the pump along with the upward flowing of the fluid can not be settled on the pump at the position, and therefore the particles are prevented from being stuck on the pump. Utilize gas-liquid-solid three-phase density difference, set up reasonable flow space, make bubble floating velocity be faster than liquid downflow velocity, solid particle sinking velocity is faster than liquid upflow velocity, furthest separates out gas, solid particle from liquid, avoids the emergence of drainage pump gas lock or card pump trouble, the effectual gas-liquid-solid separator's in the pit shaft reliability and life that have improved.
The above examples are merely illustrative for clearly illustrating the present invention and are not intended to limit the embodiments; the scope of the present invention includes, but is not limited to, the above embodiments, and all equivalent changes in the shape and structure according to the present invention are included in the scope of the present invention.
Claims (6)
1. A gas-liquid-solid separation device in a shaft is applied between a discharge and production pump and a sand setting pipe of coal bed gas well discharge and production equipment and is characterized by comprising an oil pipe joint hoop, a lifting short section, an upper joint, an outer pipe, a night inlet, an inner pipe, an expanding short section and a lower joint;
the upper joint is in a hollow ring shape, and the lower end of the upper joint is provided with an outer buckle positioned on the outer side of the upper joint and an inner buckle positioned on the inner side of the upper joint;
the upper end of the outer pipe is assembled and connected with the upper joint through the outer buckle, and the upper end of the outer pipe is provided with a plurality of liquid inlet holes penetrating through the outer pipe;
the inner pipe is inserted and accommodated in the outer pipe and spaced from the outer pipe, the upper end of the inner pipe is assembled and connected with the upper joint through the inner buckle, and the inner pipe is communicated with the upper joint;
the diameter expanding short section is connected to the lower end of the inner pipe to be suspended in the outer pipe, and the diameter expanding short section and the outer pipe are spaced;
the inner pipe, the diameter-expanding short section and the outer pipe together enclose an inner pipe annulus and an outer pipe annulus, and the inner pipe annulus and the outer pipe annulus meet a preset flow area so as to realize gas-liquid separation;
the flow area of the diameter-expanding short section is not less than that of an externally connected upper pump oil pipe, so that the flow rate of liquid at the position of the diameter-expanding short section is lower than that of liquid at any position of the externally connected upper pump oil pipe, and solid particles are settled and separated from the liquid;
the lower joint is connected to the lower end of the outer pipe through a screw thread;
the lower end of the lifting short section is inserted and connected to the upper end of the upper joint, and the oil pipe joint hoop is connected to the upper end of the lifting short section.
2. The gas-liquid-solid separation device in the shaft according to claim 1, wherein the liquid inlet holes are arranged from the outer pipe to the upper joint at a distance of 150mm, and the diameters and the number of the liquid inlet holes are designed to meet the requirement that the maximum overflowing speed of all the liquid inlet holes is lower than 0.2 m/s.
3. The apparatus for gas-liquid-solid separation in a wellbore of claim 1, wherein the inner and outer tubular annulus satisfies a predetermined flow area, comprising:
calculating by using the maximum theoretical displacement of a discharge and production pump externally connected with the gas-liquid-solid separation device in the shaft, so that the inner diameter of the inner pipe meets the requirement of the flow velocity of 2 m/s;
the outer diameter of the outer pipe is at least 6mm smaller than the inner diameter of a shaft casing externally connected with the gas-liquid-solid separation device in the shaft;
the inner and outer tube annular space meets the floating speed of the bubbles with the maximum liquid flow rate lower than 0.1mm in diameter;
the difference between the inner diameter of the outer pipe and the outer diameter of the diameter-expanding short section is larger than 10 mm;
the length of the outer pipe meets the condition that the effective separation volume of the inner pipe annulus and the outer pipe annulus is larger than the single suction volume of the drainage pump.
4. The apparatus of claim 1, wherein a clearance distance between a lower end of the enlarged diameter sub and the lower joint is at least 200 mm.
5. The apparatus for gas-liquid-solid separation in a wellbore of claim 1, wherein the upper joint is terminated with a hoisting sub and a tubing coupling, comprising:
the length of the lifting short section is 400mm, the diameter of the lifting short section is consistent with that of an externally connected upper pumping oil pipe, and the diameter of the oil pipe joint hoop is matched with that of the lifting short section.
6. A method of designing a gas-liquid-solid separation apparatus in a wellbore according to claim 1, wherein the method comprises the steps of:
step S1, designing specification parameters of the outer pipe and the inner pipe:
based on the floating speed of the bubbles of the leaf being 0.2m/s, the inner diameter of the outer tube is set as DInner diameter of outer tubeThe unit: mm; the length of the outer pipe is LOuter tubeThe unit: m;
the outer diameter of the inner pipe is set as D based on the outer diameter of the external oil pipe of the pumpOuter diameter of inner pipeThe unit "mm; inner diameter of the inner tube is DInner diameter of inner tubeThe unit: mm; the length of the inner tube is LInner pipeThe unit: m;
the daily maximum output of the external drainage pump is set as Q, unit: m is3D; number of strokes is n, unit: the times are/min;
setting the aperture of the liquid inlet hole as d, unit: mm; the number of the holes is k, and the unit is one;
step S2, obtaining specification parameters of the outer tube and the inner tube:
taking the upward flow velocity of the liquid in the inner pipe as 2m/s to obtain:
Dinner diameter of inner tube＝3.84√Q (1)
According to the calculation result of the formula (1), selecting a proper inner pipe in the pipe sequence, and simultaneously determining the corresponding DOuter diameter of inner pipe；
And obtaining the following result according to the liquid descending flow velocity in the inner and outer tube annular space of 0.2 m/s:
Dinner diameter of outer tube＝√(147.44Q+DOuter diameter of inner pipe 2) (2)
Calculating the result according to formula (2) and using DOuter diameter of outer tubeSelecting a proper outer pipe in the pipe sequence under the condition that the inner diameter of the outer well casing is 6 mm;
on the basis that the aperture d of the liquid inlet hole is 8mm or 10mm, the flow speed of liquid entering the liquid inlet hole is less than 0.2m/s, and the method comprises the following steps:
k>147.44Q/d2 (3)
determining the total number of the liquid inlet holes by the multiple of the number of holes per circle according to the calculation result of the formula (3);
on the basis that the volume of the inner and outer tube annuluses is larger than the single-stroke pumping capacity of an external drainage pump, the effective separation length of the inner and outer tube annuluses is L:
L>884.6Q/n/(Dinner diameter of outer tube 2-DOuter diameter of inner pipe 2) (4)
Adding the length of the liquid inlet hole arrangement section to the L according to the calculation result of the formula (4) to obtain the minimum length L of the inner pipeInner pipe(ii) a Inner pipe length LInner pipe+ expanding nipple length + expanding nipple and lower joint clearance distance 0.2m as the minimum length L of the outer tubeOuter tube。
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