阅读说明：本技术 井下三相自适应分离装置 (Underground three-phase self-adaptive separation device ) 是由 臧春雷 周新华 岳庆元 林云 张国 柴寿春 张廷发 杨新 张海洋 于 2020-12-03 设计创作，主要内容包括：本发明涉及一种井下三相自适应分离装置,其特征在于：包括三相分离单元及若干安装于三相分离单元上的两相分离单元。本发明设计科学合理,可以确保三相的彻底分离,防止气体进入抽油泵,提高抽油泵的泵效；同时能够适用于连续及间歇分离,且能够满足不同产量及油气比的需要,适用范围广泛。(The invention relates to an underground three-phase self-adaptive separation device, which is characterized in that: comprises a three-phase separation unit and a plurality of two-phase separation units arranged on the three-phase separation unit. The invention has scientific and reasonable design, can ensure the thorough separation of three phases, prevent gas from entering the oil well pump and improve the pump efficiency of the oil well pump; meanwhile, the method is suitable for continuous and intermittent separation, can meet the requirements of different yields and oil-gas ratios, and has wide application range.)

1. The utility model provides a three-phase self-adaptation separator in pit which characterized in that: comprises a three-phase separation unit and a plurality of two-phase separation units arranged on the three-phase separation unit,

the three-phase separation unit comprises a liquid inlet joint, a sedimentation central pipe, an outer sleeve, a variable buckle joint, a sand settling pipe and a pipe plug, wherein the outer sleeve is coaxially arranged on the outer side of the lower end of the liquid inlet joint, the sedimentation central pipe is coaxially arranged on the inner side of the liquid inlet joint, a liquid inlet/air outlet hole is formed in the liquid inlet joint and corresponds to an annular space formed by the sedimentation central pipe and the outer sleeve, the sand settling pipe is arranged at the lower end of the outer sleeve through the variable buckle joint, and the pipe plug is arranged at the lower end of the sand settling pipe;

the two-phase separation unit comprises a gas-liquid separation coupling, a gas collection cap, an outer pipe, a central pipe and a bearing seat, the outer pipe is coaxially installed on the outer wall of the lower end of the gas-liquid separation coupling, the inner side of the gas-liquid separation coupling is connected with a valve ball and the gas collection cap through a single-flow valve bell-mouthed valve seat, the gas collection cap is in contact with the valve ball, the central pipe is coaxially installed in the outer pipe, the lower end of the central pipe is connected with the bearing seat through a bearing joint, a liquid channel and a gas outlet hole which are vertically communicated are formed in the gas-liquid separation coupling, spiral slices are evenly arranged on the outer wall of the central pipe from top to bottom, a gas collection seam is arranged on the lower portion of the central pipe, a liquid inlet hole is formed in the.

2. The downhole three-phase adaptive separation device of claim 1, wherein: and the spiral blades are provided with air holes.

3. The downhole three-phase adaptive separation device of claim 1, wherein: the length of the gas collecting cap is greater than the sum of the height of a liquid column converted by the weight of the valve ball and the vertical height from the contact point of the upper valve ball and the gas collecting cap to the gas outlet.

4. The downhole three-phase adaptive separation device of claim 1, wherein: the gas collecting seams are a plurality of and are uniformly distributed on the lower part of the central tube.

5. The downhole three-phase adaptive separation device of claim 1, wherein: the width of the gas collecting seam is less than 1 mm.

6. The downhole three-phase adaptive separation device of claim 1, wherein: the air outlet is obliquely and upwards arranged.

Technical Field

The invention belongs to the field of oil extraction processes, relates to an oil well pump separating device, and particularly relates to an underground three-phase self-adaptive separating device for separating gas phase, liquid phase and solid phase under an oil well pump.

Background

In the oil extraction process of an oil well, more or less accompanied gas is produced, if the oil gas of the oil well is large, the gas has great influence on the pump efficiency, and the serious oil well even has gas lock, namely, in the pumping process, the suction and discharge valve can not be opened due to the compression and expansion of the gas in the pump, and the phenomenon of oil pumping can not be produced.

Therefore, the multiphase separation device is arranged on the oil well pump, so that the filling coefficient of the oil well pump can be improved, and the pump efficiency is improved. The separation devices currently used have the following problems:

1. the separated gas can not be ensured to enter annular spaces of an oil pipe and a casing pipe, so that incomplete separation is caused;

2. the separation device only has one-stage gas-liquid separation and cannot meet the requirements of different liquid production amounts and different oil-gas ratios; and the requirement of separating solid phase (sand) cannot be met;

3. can only be used for discontinuous liquid-gas separation, such as an oil pumping well, and cannot be used for continuous liquid-gas separation, such as an electric submersible pump well or a screw pump well.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide the underground three-phase self-adaptive separation device, which can ensure the thorough separation of three phases, prevent gas from entering an oil well pump and improve the pump efficiency of the oil well pump; meanwhile, the method is suitable for continuous and intermittent separation, can meet the requirements of different yields and oil-gas ratios, and has wide application range.

The technical problem to be solved by the invention is realized by the following technical scheme:

the utility model provides a three-phase self-adaptation separator in pit which characterized in that: comprises a three-phase separation unit and a plurality of two-phase separation units arranged on the three-phase separation unit,

the three-phase separation unit comprises a liquid inlet joint, a sedimentation central pipe, an outer sleeve, a variable buckle joint, a sand settling pipe and a pipe plug, wherein the outer sleeve is coaxially arranged on the outer side of the lower end of the liquid inlet joint, the sedimentation central pipe is coaxially arranged on the inner side of the liquid inlet joint, a liquid inlet/air outlet hole is formed in the liquid inlet joint and corresponds to an annular space formed by the sedimentation central pipe and the outer sleeve, the sand settling pipe is arranged at the lower end of the outer sleeve through the variable buckle joint, and the pipe plug is arranged at the lower end of the sand settling pipe;

the two-phase separation unit comprises a gas-liquid separation coupling, a gas collection cap, an outer pipe, a central pipe and a bearing seat, the outer pipe is coaxially installed on the outer wall of the lower end of the gas-liquid separation coupling, the inner side of the gas-liquid separation coupling is connected with a valve ball and the gas collection cap through a single-flow valve bell-mouthed valve seat, the gas collection cap is in contact with the valve ball, the central pipe is coaxially installed in the outer pipe, the lower end of the central pipe is connected with the bearing seat through a bearing joint, a liquid channel and a gas outlet hole which are vertically communicated are formed in the gas-liquid separation coupling, spiral slices are evenly arranged on the outer wall of the central pipe from top to bottom, a gas collection seam is arranged on the lower portion of the central pipe, a liquid inlet hole is formed in the.

Moreover, the spiral blades are provided with air holes.

And the length of the gas collecting cap is greater than the sum of the height of a liquid column converted by the weight of the valve ball and the vertical height from the contact point of the upper valve ball and the gas collecting cap to the gas outlet.

Moreover, the air collecting seams are a plurality of and are uniformly distributed at the lower part of the central tube.

And the width of the air collecting gap is less than 1 mm.

Moreover, the air outlet is obliquely and upwards arranged.

The invention has the advantages and beneficial effects that:

1. the underground three-phase self-adaptive separation device comprises a three-phase separation unit and a plurality of two-phase separation units arranged on the three-phase separation unit, wherein through the three-phase separation and the multi-stage separation of the two-phase separation units, the fluid entering the pump is ensured not to contain gas, the pump efficiency of an oil well pump is improved, and the service life of the pump is prolonged; meanwhile, the requirements of different yields and oil-gas ratios can be met, and the application range is wide.

2. According to the underground three-phase self-adaptive separation device, the spiral blades are provided with the air holes, so that gas separated from fluid can be moved upwards, and effective gas-liquid separation is realized.

3. According to the underground three-phase self-adaptive separation device, the length of the gas collecting cap is larger than the sum of the height of a liquid column converted from the weight of the valve ball and the vertical height from the contact point of the upper valve ball and the gas collecting cap to the gas outlet, so that gas in the gas collecting cap can prop the valve ball open and smoothly enter the annular space through the gas outlet.

4. The invention relates to an underground three-phase self-adaptive separation device, wherein a plurality of gas collecting slits are uniformly distributed at the lower part of a central tube, on one hand, gas separated from fluid is collected, on the other hand, in the down stroke process of an oil well pump, the fluid is in a stagnation state, part of liquid enters the central tube through the gas collecting slits, in the next stroke, the gas in the central tube can carry the entering liquid to enter a gas collecting cap, and the liquid flows out of the gas collecting cap under the action of gravity.

5. According to the underground three-phase self-adaptive separation device, the air outlet holes are obliquely and upwards arranged, so that gas can be ensured to enter the annular space, and the gas can be thoroughly separated.

6. The invention has scientific and reasonable design, can ensure the thorough separation of three phases, prevent gas from entering the oil well pump and improve the pump efficiency of the oil well pump; meanwhile, the method is suitable for continuous and intermittent separation, can meet the requirements of different yields and oil-gas ratios, and has wide application range.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic diagram of a three-phase separation unit according to the present invention;

FIG. 3 is a schematic diagram of the structure of a two-phase separation unit according to the present invention;

FIG. 4 is a schematic view of the structure of the two-phase separation unit according to the present invention.

Detailed Description

The present invention is further illustrated by the following specific examples, which are intended to be illustrative, not limiting and are not intended to limit the scope of the invention.

As shown in fig. 1, the underground three-phase self-adaptive separation device is innovative in that: comprises a three-phase separation unit, an I-stage two-phase separation unit and an II-stage two-phase separation unit which are arranged on the three-phase separation unit.

As shown in fig. 2, the three-phase separation unit includes liquid inlet joint (1), settlement center tube (3), outer tube (4), change lock joint (5), sand setting pipe (6) and plug (7), liquid inlet joint lower extreme outside coaxial arrangement the outer tube, inboard coaxial arrangement the settlement center tube, be provided with feed liquor/exhaust hole (2) on the liquid inlet joint, feed liquor/exhaust hole corresponds the annular space that settlement center tube and outer tube formed, the outer tube lower extreme is through changing the lock joint installation the sand setting pipe, the lower extreme of sand setting pipe is provided with the plug.

The formation fluid is in a state that gas slips from the fluid until the formation fluid enters the liquid inlet hole of the three-phase separation unit. And after entering the annular space of the three-phase separation unit from the liquid inlet hole, the gas in the fluid in the annular space of the outer pipe and the central pipe slips again when the fluid is in a stagnation state in the down stroke.

The annular volume of the outer pipe and the central pipe corresponding to the height L1 is more than or equal to the volume of two oil well pump strokes, liquid of the lower half part of the annular space corresponding to the L1 is sucked into the central pipe by each stroke so as to enter the oil well pump, the liquid of the upper half part flows into the lower half part, the external fluid of the three-phase separation unit enters the upper half part of the annular space through the liquid inlet hole again, and the gas continuously slides from the fluid when the down stroke of the oil well pump is in static stagnation. Thereby achieving high filling factor of the oil well pump and high pumping efficiency.

As shown in fig. 3, the two-phase separation unit comprises a gas-liquid separation coupling (1), a gas collection cap (4), an outer tube (6), a central tube (7) and a bearing seat (12), the outer tube is coaxially mounted on the outer wall of the lower end of the gas-liquid separation coupling, a valve ball (3) and the gas collection cap are connected to the inner side of the gas-liquid separation coupling through a single-flow valve bell-mouth valve seat, the gas collection cap is in contact with the valve ball, the central tube is coaxially mounted in the outer tube, the lower end of the central tube is connected with the bearing seat through a bearing joint (10), a liquid channel (5) which is through from top to bottom and an air outlet hole (2) which is arranged obliquely and upwards are arranged on the gas-liquid separation coupling, so that; spiral slices (9) are uniformly arranged on the outer wall of the central tube from top to bottom, a gas collecting seam (8) is arranged on the lower portion of the central tube, the width of the gas collecting seam is smaller than 1mm, a liquid inlet hole (11) is formed in the bearing seat, and the liquid inlet hole and the gas outlet hole correspond to an annular space formed by the central tube and the outer tube.

The fluid enters the outer tube from the liquid inlet hole, and rotates along the outer wall of the central tube to move upwards along the helical blade, under the action of centrifugal force, the liquid in the fluid is close to the inner wall of the outer tube, gas passes through the air holes 13 to enter the air collecting gap in the process of moving upwards along the central tube, meanwhile, the gas is far less than the viscosity of the gas, the liquid can more easily enter the air collecting gap and continuously move upwards along the inner wall of the central tube to enter the air collecting cap, and when the gas pressure in the air collecting cap is greater than the weight of the valve ball 3 and the liquid column pressure at the height of h', the gas pushes the valve ball open and enters the; liquid in the fluid goes upward along the inner wall of the outer pipe and enters the oil well pump through the liquid channel or enters the second-stage two-phase separation device for continuous separation.

The length h of the gas collecting cap is larger than the liquid column height converted by the weight of the valve ball plus h', so that the gas in the gas collecting cap can push the valve ball open and smoothly enter the annular space through the gas outlet.

The gas collecting slits on the central tube collect and separate gas from the fluid on one hand; on the other hand, in the down stroke process of the oil well pump, the fluid is in a stagnation state, part of liquid enters the central pipe through the gas collecting slit, the gas in the central pipe can carry the entering liquid to enter the gas collecting cap during the next stroke, and the liquid flows out of the gas collecting cap under the action of gravity.

The spiral blades are provided with the air holes, so that the air separated from the fluid can be transported upwards.

The requirement of different pump diameters, strokes and oil-gas ratios can not be met by using one two-phase separation unit monomer, so that insufficient gas-liquid separation is inevitably caused.

For example, the maximum stroke of an oil pump with the length of 38mm, 44mm and 56mm is calculated as follows: the liquid volume discharged by each stroke of the 38mm oil pump is 6.8L, the volume of each single two-phase separation device is 2.93L, the required number of the single two-phase separation devices is 2.32, 3 single two-phase separation devices can be installed in the implementation process, the fluid in each stroke is divided into 3 units, and the fluid in each unit is separated for 4 times; the liquid volume discharged by each stroke of a pump with the diameter of 44mm is 9.12L, the volume of each single two-phase separation device is 2.93L, the number of the needed single two-phase separation devices is 3.11, 4 single two-phase separation devices can be installed in the implementation process, the fluid of each stroke is divided into 4 units, and the fluid of each unit is separated for 4 times; ③ the liquid volume discharged by each stroke of the 56mm pump is 14.77L, the volume of each single two-phase separation device is 2.93L, 5 single two-phase separation devices are obtained, 5 single two-phase separation devices can be installed in the implementation process, the fluid of each stroke is divided into 5 units, and the fluid of each unit is separated for 5 times, thus ensuring the full separation of liquid and gas. For the oil well with continuous oil extraction, when the gas collecting cap is filled with gas, the valve is pushed open, and the gas can be discharged from the gas outlet, so that the two-phase separation device is suitable for both the oil well with intermittent oil extraction of an oil pump and the oil well with continuous oil extraction of a screw pump or an electric submersible pump, and has strong adaptability.

The yield is low, the gas-liquid ratio is small, gas and liquid can be separated in one stage, and the gas and liquid can be separated in series in multiple stages when the yield is high and the gas-liquid ratio is large. The number of stages of gas anchors can be determined on site by looking at an indicator diagram reflecting the efficiency of the oil well pump.

As shown in figure 4, fluid enters the outer pipe from the I-stage liquid inlet hole, moves upwards along the outer wall of the central pipe along the rotation of the helical blade, gas enters the gas collecting gap, liquid in the fluid moves upwards along the inner wall of the outer pipe and enters the liquid inlet hole of the II-stage gas anchor through the liquid channel, and then moves upwards through the helical blade of the II-stage gas anchor to continue to be separated, so that the gas is better separated from the fluid, and secondary separation is realized.

The working principle of the invention is as follows:

the fluid firstly enters the liquid inlet/exhaust hole of the three-phase separation device, is discharged from the sedimentation central pipe through slippage separation, then enters the liquid inlet hole of the I-stage two-phase separation unit, is subjected to centrifugal shear force separation by the upward rotation of the helical blade, enters the liquid inlet hole of the II-stage two-phase separation unit through the liquid channel, and is subjected to upward continuous separation by the helical blade of the II-stage two-phase separation unit, so that the gas is more fully separated from the fluid. The bottom of the three-phase separation unit is connected with a sand setting pipe, so that a small amount of sand and solid phase components in the fluid enter the sand setting pipe under the action of gravity and shearing force.

Although the embodiments of the present invention and the accompanying drawings are disclosed for illustrative purposes, those skilled in the art will appreciate that: various substitutions, changes and modifications are possible without departing from the spirit and scope of the invention and the appended claims, and therefore the scope of the invention is not limited to the disclosure of the embodiments and the accompanying drawings.