Fine sand filtering three-phase gas-sand anchor

Abstract

The utility model discloses a fine sand filtering three-phase gas sand anchor which 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 liquid 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 utility model relates to oil well downhole tool technical field, in particular to a fine filter sand three -phase gas sand anchor. BACKGROUND

[0002] In the thin oil well, beam -pumping unit is mostly used, drives downhole rod column and reciprocating oil pump operation and draws oil. The downhole oil contains a large amount of free gas and solid impurities. A large amount of gas enters the pump cylinder, can greatly reduce the oil pump filling coefficient, thereby reducing pump efficiency. In addition, solid impurities enter the oil pump, also can accelerate the pump cylinder and plunger wear, or sand bury plunger, shorten normal oil production cycle, even lead to production accidents.

[0003] Connecting the gas anchor under the oil pump is one of the conventional ways to improve pump efficiency. The spiral gas anchor is used to prevent gas, which has certain effect, but the effect is not ideal in the sand well. In addition, there is a gravity cup structure gas anchor, which separates gas phase by using the slip effect generated by the density difference of gas and liquid.

[0004] The common spiral gas anchor has the following disadvantages: the liquid inlet channel and the gas discharge channel share a punching section, and the paths of the two conflict. And the punching section does not have sand prevention effect, and is easy to be blocked by solid impurities in the internal channel in the sand well. In addition, the internal flow channel is simple, and in the cyclone process, gas, liquid and sand do not have completely independent channels, which leads to incomplete sharing.

[0005] The gravity cup structure gas anchor has the following disadvantages: the gas-containing oil liquid can only flow naturally in the limited space, the oil flows downward, and the gas flows upward, the paths of the two conflict, the separation efficiency is low, and it is not suitable for high liquid production and high gas-oil ratio production well. The gas anchor relying on the slip effect alone has been eliminated.

[0006] Therefore, it is necessary to design a new gas anchor structure. UTILITY MODEL CONTENT

[0007] The utility model aims at providing a fine filter sand three -phase gas sand anchor to solve the problems of the prior art, such as easy sand plugging and sand burying, incomplete oil and gas separation, easy sand jamming, gas locking and poor pump efficiency of the oil pump, so as to realize efficient separation of oil, gas and sand.

[0008] To achieve the above object, the utility model provides the following scheme: the utility model provides a fine filter sand three -phase gas sand anchor, including upper joint, upper outer tube, central tube, spiral tube, lower connecting pipe and sand trap joint, the outside of central tube from top to bottom is sequentially provided with upper outer tube and lower outer tube, upper outer tube and lower outer tube are connected through outer tube adapter, the top of upper outer tube is equipped with upper joint, the bottom of lower outer tube is equipped with sand trap joint, the outside of central tube is located in the inside of upper connecting pipe still is provided with spiral tube, the upper outer tube is opened with liquid inlet hole, and oil liquid enters the annular space between upper outer tube and spiral tube from liquid inlet hole, the outside of liquid inlet hole on upper outer tube is provided with fine filter sand subassembly.

[0009] In an embodiment, the fine filter sand subassembly adopts an external sintered filter screen.

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

[0011] In an embodiment, the top of the upper outer tube is provided with an air outlet sintered filter screen on the outside.

[0012] In an embodiment, the top of the spiral tube is equipped with a spiral tube suspension head, and the spiral tube suspension head is installed in the inner cavity of the upper outer tube through a suspension pin.

[0013] In an embodiment, a primary air exhaust passage is arranged at the spiral tube suspension head, the bottom of the primary air exhaust passage is in communication with the annular space between the upper outer tube and the spiral tube, and the upper portion of the primary air exhaust passage is in communication with the air outlet sintered filter screen.

[0014] In an embodiment, the pipe diameter of the lower outer tube is smaller than that of the upper outer tube, and a helical fin is arranged on the outside of the spiral tube in the inner cavity of the lower outer tube.

[0015] In an embodiment, a gas guide hole is arranged at the root of the helical fin, the gas outlet end of the gas guide hole is in communication with 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 air exhaust passage, and the top of the secondary air exhaust passage is in communication with the air outlet sintered filter screen.

[0016] Compared with the prior art, the utility model has the following beneficial technical effects:

[0017] The utility model discloses a fine filter sand three -phase gas sand anchor, including upper joint, upper outer tube, center tube, spiral tube, lower connecting pipe and sand trap joint, the outside of center tube from top to bottom is sequentially provided with upper outer tube and lower outer tube, and upper outer tube and lower outer tube are connected through outer tube adapter, the top of upper outer tube is assembled with upper joint, and the bottom of lower outer tube is assembled with sand trap joint, the outside of center tube is located in the inside of upper connecting pipe still is provided with spiral tube, and the upper outer tube is opened with liquid inlet hole, and oil liquid enters the annular space between upper outer tube and spiral tube from liquid inlet hole, and the outside of liquid inlet hole is provided with fine filter sand subassembly on the upper outer tube. Outside liquid inlet hole, increase fine filter sand subassembly, prevent solid impurity such as fine sand and enter lifting pipe column. Prevent sand from blocking, sand from grinding, sand from jamming from the root; oil liquid enters the annular space between upper outer tube and spiral tube from oil liquid, and this part does not have any hindrance, and oil liquid and gas are fully settled, and when passing through liquid inlet hole, oil liquid passes through preliminary mixing and part block, and internal dissolved gas starts to separate, and under the action of gravity and density difference, a large amount of liquid drops, and provides sufficient liquid for subsequent spiral section. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or prior art, the following will briefly introduce the drawings needed to be used in the embodiments, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without creative labor.

[0019] Fig. 1 It is the structural layout drawing of fine filter sand three -phase gas sand anchor;

[0020] Fig. 2 It is the appearance drawing of fine filter sand three -phase gas sand anchor;

[0021] Wherein, 1, upper joint, 2, upper outer tube, 3, center tube, 4, gas sintered filter screen, 5, external sintered filter screen, 6, spiral tube suspension head, 7, suspension pin, 8, spiral tube, 9, external filter screen support ring, 10, lower outer tube, 11, spiral piece, 12, outer tube adapter, 13, sand trap joint, 14, two -stage exhaust passage, 15, primary exhaust passage, 16, liquid inlet hole, 17, gas guide hole. DETAILED DESCRIPTION

[0022] The technical scheme in the embodiments of the utility model will be clearly and completely described in the following in conjunction with the drawings in the embodiments of the utility model, and obviously, the described embodiments are only some embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the utility model.

[0023] The utility model discloses a fine filter sand three-phase gas sand anchor, to solve the above prior art including easy sand block sand bury, oil gas separation is not thorough, easy sand card, gas lock, oil pump pump efficiency difference etc.

[0024] In order to make the above-mentioned purpose, features and advantages of the utility model more obvious and easy to understand, the utility model will be further explained in detail below with the drawings and specific embodiment.

[0025] As Figs. 1-2 The utility model provides a fine filter sand three-phase gas sand anchor, including upper joint 1, upper portion outer tube 2, center tube 3, spiral pipe 8, lower portion connecting pipe and sand settling joint 13, the outside of center tube 3 is sequentially provided with upper portion outer tube 2 and lower portion outer tube 10 from top to bottom, and upper portion outer tube 2 and lower portion outer tube 10 are connected through outer tube adapter 12, the top of upper portion outer tube 2 is equipped with upper joint 1, and the bottom of lower portion outer tube 10 is equipped with sand settling joint 13, the outside of center tube 3 is still provided with spiral pipe 8 in the inside of upper portion connecting pipe, and the upper portion outer tube 2 is provided with liquid inlet hole 16, and oil liquid enters the annular space between upper portion outer tube 2 and spiral pipe 8 from liquid inlet hole 16, and the outside of liquid inlet hole 16 on upper portion outer tube 2 is provided with fine filter sand subassembly.

[0026] In one embodiment, fine filter sand subassembly adopts external sintered filter screen 5, and external sintered filter screen 5 is installed on the outside of upper portion outer tube 2 through external filter screen support ring 9.

[0027] In one embodiment, liquid inlet hole 16 adopts inclined hole with downward inclination of liquid inlet direction, and the first gas barrier is formed by using the density difference of oil and gas.

[0028] In one embodiment, the top of upper portion outer tube 2 is provided with gas outlet sintered filter screen 4 on the outside.

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

[0030] In one embodiment, one-stage exhaust passage 15 is arranged at spiral pipe suspension head 6, the bottom of one-stage exhaust passage 15 communicates with the annular space between upper portion outer tube 2 and spiral pipe 8, and the upper portion of one-stage exhaust passage 15 communicates with gas outlet sintered filter screen 4.

[0031] In one embodiment, the pipe diameter of lower portion outer tube 10 is less than the pipe diameter of upper portion outer tube 2, and spiral fin 11 is assembled on the outside of spiral pipe 8 in the inner cavity of lower portion outer tube 10.

[0032] In one of the embodiments, the root of the helical blade 11 is provided with a gas guide hole 17, the gas outlet end of the gas guide hole 17 communicates with the annular space between the central pipe 3 and the spiral pipe 8, the annular space between the central pipe 3 and the spiral pipe 8 is a secondary exhaust channel 14, and the top of the secondary exhaust channel 14 communicates with the gas outlet sintered filter screen 4.

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

[0034] Outside the liquid inlet hole 16, a fine sand filtering assembly is added to prevent fine sand and other solid impurities from entering the lifting string. The sand plugging, sand grinding and sand sticking are prevented from the source. The oil enters the annular space between the upper outer pipe 2 and the spiral pipe 8, and this part does not have any obstruction, so that the oil and gas can fully settle. When the oil passes through the liquid inlet hole 16, the oil is preliminarily mixed and blocked by the parts, the internal dissolved gas begins to precipitate, and a large amount of liquid descends under the action of gravity and density difference, providing sufficient liquid for the subsequent spiral section. A large amount of gas precipitates and floats up. The gas passes through the primary exhaust channel 15 of the spiral pipe suspension head 6 and rises to the gas outlet sintered filter screen 4 and is naturally discharged.

[0035] The oil continues to flow downward, passes through the outer pipe adapter 12, enters the annular space between the lower outer pipe 10 and the spiral pipe 8, the channel is narrowed, and the flow rate is increased. The spiral pipe 8 has a helical blade 11 outside. Under the action of the helical blade 11, the oil flows downward at high speed, generating centrifugal force and promoting the running of impurities such as sand particles along the outside. The gas is squeezed to the root of the helical blade 11 and enters the secondary exhaust channel 14 between the spiral pipe 8 and the central pipe 3 through the gas guide hole 17, and directly floats up to the vicinity of the gas outlet sintered filter screen 4 and is discharged from the string.

[0036] The oil carrying sand particles reaches the vicinity of the sand settling joint 13 and the sand particles settle downward under the action of gravity and reach the lower sand settling pipe.

[0037] The liquid flows upward along the inner hole of the central pipe 3 under the pumping action of the oil pump and enters the upper oil pump.

[0038] The fine sand filtering three-phase gas sand anchor has the following advantages:

[0039] 1. The internal structure is scientifically designed, and the segmented structure makes the oil flow 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. The principles of fine filtering section, gravity, density difference and centrifugal force are comprehensively utilized to increase the flow direction of fluid and form multiple directional velocity fields in sequence, increase the escape speed of gas and form special flow distribution characteristics.

[0041] 3. It can be disassembled and maintained, which greatly reduces the use cost.

[0042] It should be noted that, for those skilled in the art, it is obvious that the present application is not limited to the details of the above exemplary embodiments, and the present application can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting, the scope of the present application is defined by the appended claims rather than the above description, therefore all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application, any reference signs in the claims should not be regarded as limiting the claims involved.

[0043] The principles and implementation modes of the present application are described by applying specific examples in the present application, the above embodiment description is only used to help understand the method and core idea of the present application; at the same time, for those skilled in the art, according to the idea of the present application, there will be changes in specific implementation modes and application scope. In conclusion, the content of the present application should not be understood as a limitation of the present application.

Claims

1. A fine filter sand three-phase gas sand anchor, characterized in that: The device includes an upper connector, an upper outer tube, a central tube, a spiral tube, a lower connecting tube, and a sand settling connector. The upper and lower outer tubes are sequentially arranged from top to bottom on the outer side of the central tube and are connected by an outer tube adapter. The upper connector is fitted at the top of the upper outer tube, and the sand settling connector is fitted at the bottom of the lower outer tube. The spiral tube is also arranged inside the upper connecting tube on the outer side of the central tube. An inlet hole is provided on the upper outer tube, through which oil enters the annular space between the upper outer tube and the spiral tube. A fine sand filter assembly is arranged on the upper outer tube outside the inlet hole.

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

3. The fine filter sand three-phase gas sand anchor according to claim 1, characterized in that: The liquid inlet is an inclined hole with the liquid inlet direction tilted downwards.

4. The fine filter sand three-phase gas sand anchor according to claim 1, characterized in that: An exhaust sintering filter screen is provided on the outer side of the top of the upper outer tube.

5. The fine filter sand three-phase gas sand anchor according to claim 4, characterized in that: The top of the spiral tube is equipped with a spiral tube suspension head, which is installed in the inner cavity of the upper outer tube by means of a suspension pin.

6. The fine filter sand three-phase gas sand anchor according to claim 5, characterized in that: 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 exhaust sintering filter.

7. The fine filter sand 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 blade is fitted on the outside of the spiral tube located in the inner cavity of the lower outer tube.

8. The fine filter sand three-phase gas sand anchor according to claim 7, characterized in that: The root of the spiral blade is provided with an air guide hole, and the 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 exhaust sintered filter screen.

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