Fine sand filtering three-phase gas-sand anchor

Abstract

The fine sand filtering three-phase gas-sand anchor comprises an upper connector, an upper outer pipe, a central pipe, a spiral pipe, a lower connecting pipe and a sand setting connector, the spiral pipe is further arranged on the outer side of the central pipe and located in the upper connecting pipe, a liquid inlet hole is formed in the upper outer pipe, and oil enters an annular space between the upper outer pipe and the spiral pipe from the liquid inlet hole; and a fine sand filtering assembly is arranged on the outer side of the liquid inlet hole on the upper outer pipe. And a fine sand filtering assembly is additionally arranged outside the liquid inlet hole, so that solid impurities such as fine sand are prevented from entering the lifting pipe column. Sand blocking, sanding and sand blocking are prevented from the source; oil liquid enters an annular space between the upper outer pipe and the spiral pipe without any obstruction, the oil liquid and gas are fully settled, when the oil liquid passes through the liquid inlet hole, the oil liquid is preliminarily mixed and blocked by parts, internally dissolved gas begins to be separated out, and under the action of gravity and density difference, a large amount of liquid descends, so that the gas is separated out. Sufficient liquid is provided for a subsequent spiral section.

Description

Technical Field

[0001] The invention relates to the technical field of oil well downhole tools, in particular to a fine sand filtering three-phase gas sand anchor. Background Art

[0002] In thin oil wells, beam pumping units are often used to drive the downhole rod column and reciprocating oil pump to pump oil. Downhole oil contains a large amount of free gas and solid impurities. A large amount of gas entering the pump barrel will greatly reduce the filling coefficient of the oil pump, thereby reducing the pump efficiency. In addition, solid impurities entering the oil pump will also accelerate the wear of the pump barrel and plunger, or bury the plunger in sand, shorten the normal oil production cycle, and even cause production suspension accidents.

[0003] Connecting an air anchor under the oil well pump is one of the conventional ways to improve pump efficiency. In the past, spiral air anchors were used to prevent gas, which had a certain effect, but the effect was not ideal in sand-producing wells. In addition, there is a gravity cup structure air anchor, which uses the slippage effect caused by the difference in density between gas and liquid to separate the gas phase.

[0004] Disadvantages of ordinary spiral air anchors: the inlet channel and the exhaust channel share a perforated section, and the paths of the two conflict. In addition, the perforated section does not have a sand prevention effect, and the internal channel is easily blocked by solid impurities in the sand outlet well. In addition, the internal flow channel is simple, and during the cyclone process, the gas, liquid, and sand do not have completely independent channels, resulting in incomplete sharing.

[0005] Disadvantages of gravity cup structure gas anchor: gas-containing oil can only flow naturally in a confined space. Oil goes down and gas goes up, and the two paths conflict. The separation efficiency is low and it is not suitable for production wells with high liquid production and high gas-oil ratio. Gas anchors that rely solely on the slip effect have been eliminated.

[0006] Based on this, a new air anchor structure needs to be designed. Summary of the invention

[0007] The purpose of the present invention is to provide a fine sand filtering three-phase gas-sand anchor to solve the problems existing in the above-mentioned prior art, including easy sand blockage and sand burial, incomplete oil and gas separation, easy sand jamming, gas lock, poor pump efficiency and so on, so as to achieve efficient separation of oil, gas and sand.

[0008] To achieve the above-mentioned purpose, the present invention provides the following scheme: The present invention provides a fine sand filtering three-phase gas sand anchor, comprising an upper joint, an upper outer tube, a central tube, a spiral tube, a lower connecting tube and a sand settling joint, the outer side of the central tube is provided with the upper outer tube and the lower outer tube in sequence from top to bottom, and the upper outer tube and the lower outer tube are connected by an outer tube adapter; the top of the upper outer tube is equipped with an upper joint, and the bottom of the lower outer tube is equipped with a sand settling joint; the outer side of the central tube is located inside the upper connecting tube and the spiral tube is also provided, a liquid inlet hole is opened on the upper outer tube, and oil enters the annular space between the upper outer tube and the spiral tube from the liquid inlet hole; a fine sand filtering component is provided on the upper outer tube at the outer side of the liquid inlet hole.

[0009] In one embodiment, the fine sand filter assembly uses an external sintered filter screen.

[0010] In one embodiment, the liquid inlet hole is an inclined hole with the liquid inlet direction inclined downward.

[0011] In one embodiment, a gas outlet sintered filter is provided on the outer side of the top of the upper outer tube.

[0012] In one embodiment, a spiral tube hanging head is mounted on the top of the spiral tube, and the spiral tube hanging head is installed in the inner cavity of the upper outer tube through a hanging pin.

[0013] In one embodiment, a primary exhaust channel is provided at the spiral tube suspension head, the bottom of the primary exhaust channel is connected to the annular space between the upper outer tube and the spiral tube, and the upper part of the primary exhaust channel is connected to the gas outlet sintered filter.

[0014] In one embodiment, the diameter of the lower outer tube is smaller than the diameter of the upper outer tube, and a spiral sheet is installed on the outer side of the spiral tube located in the inner cavity of the lower outer tube.

[0015] In one embodiment, an air guide hole is opened at the root of the spiral sheet, and the air outlet end of the air guide hole is connected to the annular space between the central tube and the spiral tube. The annular space between the central tube and the spiral tube is a secondary exhaust channel, and the top of the secondary exhaust channel is connected to the air outlet sintered filter.

[0016] Compared with the prior art, the present invention has achieved the following beneficial technical effects:

[0017] The fine sand filtering three-phase gas sand anchor of the present invention comprises an upper joint, an upper outer tube, a central tube, a spiral tube, a lower connecting tube and a sand settling joint. The outer side of the central tube is provided with an upper outer tube and a lower outer tube in sequence from top to bottom, and the upper outer tube and the lower outer tube are connected through an outer tube adapter; the top of the upper outer tube is equipped with an upper joint, and the bottom of the lower outer tube is equipped with a sand settling joint; the outer side of the central tube is provided with a spiral tube inside the upper connecting tube, and a liquid inlet hole is provided on the upper outer tube, and oil enters the annular space between the upper outer tube and the spiral tube from the liquid inlet hole; a fine sand filtering assembly is provided on the outer side of the liquid inlet hole on the upper outer tube. A fine sand filtering assembly is added outside the liquid inlet hole to prevent solid impurities such as fine sand from entering the lifting column. Prevent sand blockage, sand grinding and sand jam from the root; the oil enters the annular space between the upper outer tube and the spiral tube. There is no obstacle in this part, allowing the oil and gas to fully settle. When passing through the liquid inlet hole, the oil is initially mixed and blocked by parts, and the gas dissolved inside begins to precipitate. Under the action of gravity and density difference, a large amount of liquid descends, providing sufficient liquid for the subsequent spiral section. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 This is the structural layout diagram of the fine sand filter three-phase gas sand anchor;

[0020] Figure 2 This is the appearance picture of the fine sand filter three-phase gas sand anchor;

[0021] Among them, 1. upper joint; 2. upper outer tube; 3. central tube; 4. gas outlet sintered filter; 5. external sintered filter; 6. spiral tube hanging head; 7. hanging pin; 8. spiral tube; 9. external filter support ring; 10. lower outer tube; 11. spiral sheet; 12. outer tube adapter; 13. sand settling joint; 14. secondary exhaust channel; 15. primary exhaust channel; 16. liquid inlet hole; 17. air guide hole. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] The purpose of the present invention is to provide a fine sand filtering three-phase gas-sand anchor to solve the problems existing in the above-mentioned prior art, including easy sand blockage and sand burial, incomplete oil and gas separation, easy sand jamming, gas lock, poor pump efficiency and so on, so as to achieve efficient separation of oil, gas and sand.

[0024] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] like Figure 1-Figure 2 As shown, the present invention provides a fine sand filtering three-phase gas sand anchor, comprising an upper joint 1, an upper outer tube 2, a central tube 3, a spiral tube 8, a lower connecting tube and a sand settling joint 13, the outer side of the central tube 3 is sequentially provided with an upper outer tube 2 and a lower outer tube 10 from top to bottom, and the upper outer tube 2 and the lower outer tube 10 are connected through an outer tube adapter 12; the top of the upper outer tube 2 is equipped with the upper joint 1, and the bottom of the lower outer tube 10 is equipped with a sand settling joint 13; the outer side of the central tube 3 is located inside the upper connecting tube and is further provided with a spiral tube 8, the upper outer tube 2 is provided with a liquid inlet hole 16, and oil enters the annular space between the upper outer tube 2 and the spiral tube 8 from the liquid inlet hole 16; a fine sand filtering component is provided on the upper outer tube 2 and is located outside the liquid inlet hole 16.

[0026] In one embodiment, the fine sand filter assembly adopts an external sintered filter screen 5, and the external sintered filter screen 5 is installed on the outer side of the upper outer tube 2 through an external filter screen support ring 9. The fine sand filter assembly can also be replaced by wire wrapping.

[0027] In one embodiment, the liquid inlet hole 16 is an inclined hole with a downward inclination in the liquid inlet direction, and the first anti-gas barrier is formed by utilizing the density difference between oil and gas.

[0028] In one embodiment, a gas outlet sintered filter 4 is disposed on the outer side of the top of the upper outer tube 2 .

[0029] In one embodiment, the top of the spiral tube 8 is equipped with a spiral tube hanging head 6 , and the spiral tube hanging head 6 is installed in the inner cavity of the upper outer tube 2 through a hanging pin 7 .

[0030] In one of the embodiments, a primary exhaust channel 15 is provided at the spiral tube suspension head 6 , the bottom of the primary exhaust channel 15 is connected to the annular space between the upper outer tube 2 and the spiral tube 8 , and the upper part of the primary exhaust channel 15 is connected to the gas outlet sintered filter 4 .

[0031] In one embodiment, the diameter of the lower outer tube 10 is smaller than that of the upper outer tube 2 , and a spiral sheet 11 is installed on the outer side of the spiral tube 8 in the inner cavity of the lower outer tube 10 .

[0032] In one of the embodiments, an air guide hole 17 is opened at the root of the spiral blade 11, and the air outlet end of the air guide hole 17 is connected to the annular space between the central tube 3 and the spiral tube 8. The annular space between the central tube 3 and the spiral tube 8 is a secondary exhaust channel 14, and the top of the secondary exhaust channel 14 is connected to the air outlet sintered filter 4.

[0033] The working principle of the fine sand filtering three-phase gas sand anchor of the present invention is as follows:

[0034] A fine sand filter assembly is added outside the liquid inlet 16 to prevent fine sand and other solid impurities from entering the lifting column. Sand blockage, sand grinding, and sand jam are prevented from the root; the oil enters the annular space between the upper outer tube 2 and the spiral tube 8, which has no obstacles, allowing the oil and gas to fully settle. When passing through the liquid inlet 16, the oil is initially mixed and blocked by parts, and the gas dissolved inside begins to precipitate. Under the action of gravity and density difference, a large amount of liquid descends, providing sufficient liquid for the subsequent spiral section; a large amount of precipitated gas floats up, and the gas passes through the primary exhaust channel 15 of the spiral tube suspension head 6, and goes up to the gas outlet sintered filter 4, and is naturally discharged.

[0035] The oil continues to descend, passes through the outer tube adapter 12, and enters the annular space between the lower outer tube 10 and the spiral tube 8, the channel becomes narrower, and the flow rate increases; there is a spiral sheet 11 on the outside of the spiral tube 8. Under the action of the spiral sheet 11, the oil spirals downward at high speed, generating centrifugal force, which promotes impurities such as sand particles to move along the outside, and the gas is squeezed to the root of the spiral sheet 11, through the air guide hole 17, into the secondary exhaust channel 14 between the spiral tube 8 and the central tube 3, and directly floats up to the vicinity of the gas outlet sintered filter 4, and is discharged from the pipe column.

[0036] The oil carries sand impurities to the vicinity of the sand settling joint 13. Under the action of gravity, the sand settles downward and reaches the lower sand settling pipe.

[0037] Under the suction action of the oil pump, the liquid flows upward along the inner hole of the central pipe 3 and enters the upper oil pump.

[0038] Fine filter sand three-phase gas sand anchor has the following advantages:

[0039] 1. The scientifically designed internal structure and segmented structure allow the oil to pass through different functional sections in sequence, and the gas and liquid run smoothly without conflict, greatly improving the separation efficiency and adaptability to various well conditions.

[0040] 2. Comprehensively utilize various principles such as fine filtration section, gravity, density difference, centrifugal force, etc. to increase the direction of the fluid, form velocity fields in multiple directions in turn, increase the gas escape velocity, and form special diversion characteristics.

[0041] 3. Can be disassembled for maintenance, greatly reducing the cost of use.

[0042] It should be noted that it is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention, and any figure mark in the claims should not be regarded as limiting the claims involved.

[0043] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A fine sand filtering three-phase gas-sand anchor, characterized in that: It comprises an upper joint, an upper outer tube, a central tube, a spiral tube, a lower connecting tube and a sand settling joint. The outer side of the central tube is provided with the upper outer tube and the lower outer tube in sequence from top to bottom, and the upper outer tube and the lower outer tube are connected via an outer tube adapter; the top of the upper outer tube is equipped with an upper joint, and the bottom of the lower outer tube is equipped with a sand settling joint; the outer side of the central tube is located inside the upper connecting tube and the spiral tube is also provided, and a liquid inlet hole is opened on the upper outer tube, and oil enters the annular space between the upper outer tube and the spiral tube from the liquid inlet hole; a fine sand filter assembly is provided on the outer side of the liquid inlet hole on the upper outer tube.

2. The fine sand filtering three-phase gas-sand anchor according to claim 1 is characterized in that: The fine sand filter assembly uses an external sintered filter screen.

3. The fine sand filtering three-phase gas-sand anchor according to claim 1 is characterized in that: The liquid inlet hole is an inclined hole with a liquid inlet direction inclined downward.

4. The fine sand filtering three-phase gas-sand anchor according to claim 1 is characterized in that: A gas outlet sintering filter is arranged on the outer side of the top of the upper outer tube.

5. The fine sand filtering three-phase gas-sand anchor according to claim 4 is characterized in that: The top of the spiral tube is equipped with a spiral tube hanging head, and the spiral tube hanging head is installed in the inner cavity of the upper outer tube through a hanging pin.

6. The fine sand filtering three-phase gas-sand anchor according to claim 5, characterized in that: A primary exhaust channel is arranged at the spiral tube suspension head, the bottom of the primary exhaust channel is communicated with the annular space between the upper outer tube and the spiral tube, and the upper part of the primary exhaust channel is communicated with the gas outlet sintered filter.

7. The fine sand filtering three-phase gas-sand anchor according to claim 4, characterized in that: The diameter of the lower outer tube is smaller than that of the upper outer tube, and a spiral sheet is arranged on the outer side of the spiral tube in the inner cavity of the lower outer tube.

8. The fine sand filtering three-phase gas-sand anchor according to claim 7, characterized in that: An air guide hole is opened at the root of the spiral sheet, and the air outlet end of the air guide hole is connected to the annular space between the central tube and the spiral tube. The annular space between the central tube and the spiral tube is a secondary exhaust channel, and the top of the secondary exhaust channel is connected to the air outlet sintered filter.

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