Tool for improving underground bridge plug pumping efficiency

Abstract

The utility model provides a tool for improving underground bridge plug pumping efficiency, and relates to the technical field of petroleum underground pumping. The device comprises an upper push cylinder installed on the outer wall of the cable setting tool, the upper push cylinder is of a long and thin tubular structure, internal threads formed in the inner wall of the upper push cylinder are in threaded connection with external threads formed in the outer wall of the cable setting tool, and the upper push cylinder is sleeved with a pumping ring; a lower push cylinder used for fixing the pumping ring is arranged on the outer wall of the cylindrical step of the upper push cylinder, the lower push cylinder is in threaded connection with the upper push cylinder, and an annular gap is formed between the pumping ring and the upper push cylinder; when liquid continuously acts in the annular gap between the pumping ring and the upper push cylinder, the outer diameter of the outer edge of the pumping ring is gradually increased under the action of the liquid; the closure area during pumping can be changed, the pumping efficiency is improved, and the liquid related cost and the operation time cost during operation are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of petroleum downhole pumping, in particular to a tool for improving the downhole pumping bridge plug efficiency. Background Art

[0002] In the staged fracturing operation of oil and gas wells, low pumping efficiency is usually encountered when pumping bridge plugs. Due to the operation conditions, when a small outer diameter bridge plug is required, the gap between the bridge plug and the downhole casing is too large, and the flow area of ​​the pumped liquid becomes larger. When pumping the bridge plug, the force pushing the bridge plug is reduced, which affects the speed of pumping the bridge plug, and ultimately increases the time of staged fracturing of oil and gas wells.

[0003] In the process of transporting and pumping liquid from the ground into the well, especially in horizontal well construction, the downhole tool bridge plug needs to pump liquid from the wellhead and push the bridge plug through the liquid to make it reach the designated position; when the diameter of the bridge plug is small, a large amount of liquid will pass through the gap between the bridge plug and the casing, and the thrust generated cannot act on the bridge plug, resulting in more liquid being required and longer pumping time. Utility Model Content

[0004] The purpose of the utility model is to provide a tool for improving the efficiency of underground pumping bridge plugs, and in view of the deficiencies of the prior art, the utility model can solve the problems raised by the above-mentioned background technology.

[0005] The technical solution of the utility model is achieved in this way:

[0006] The utility model provides a tool for improving the efficiency of downhole pumping bridge plugs, comprising an upper push cylinder installed on the outer wall of a cable sealing tool, a pumping ring being sleeved on the upper push cylinder, a lower push cylinder for fixing the pumping ring being provided on the outer wall of the upper push cylinder, and an annular gap being formed between the pumping ring and the upper push cylinder; when liquid continuously acts in the annular gap between the pumping ring and the upper push cylinder, the outer edge of the pumping ring gradually increases its outer diameter under the action of the liquid.

[0007] In some technical solutions of the utility model, the end of the pumping ring away from the push cylinder is a thin-walled structure.

[0008] In some technical solutions of the present utility model, a plurality of axial cuts are opened along the circumference of the pumping ring at one end of the pumping ring away from the lower push cylinder to form a petal structure.

[0009] In some technical solutions of the present utility model, the included angle of the axial cut between any two petal structures is an acute angle.

[0010] In some technical solutions of the utility model, the outer diameter of the outer side wall of the middle part of the upper push cylinder gradually decreases along the flow direction of the liquid.

[0011] In some technical solutions of the utility model, an annular groove is provided on the inner wall of the push-down cylinder, and a part of the pumping ring is embedded in the groove.

[0012] Compared with the prior art, the embodiments of the present invention have at least the following advantages or beneficial effects:

[0013] An annular gap is formed between the pumping ring and the upper push tube; when the liquid continuously acts in the annular gap between the pumping ring and the upper push tube, the outer edge of the pumping ring gradually increases its outer diameter under the action of the liquid; the intercepting area during pumping can be changed, the pumping efficiency can be improved, and the liquid-related costs and operation time costs during operation can be reduced;

[0014] The opening process of the multiple petal structures is step-by-step. After the multiple petal structures are opened, the petal positions will not form complete interception, thereby avoiding a sudden increase in the tension of the cables connected thereto, which may cause cable damage due to untimely release of the cables. Furthermore, after the pumping ring is opened, no complete interception is formed, which is conducive to the pumping ring to timely change the interception area during pumping and improve the pumping efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 It is a schematic diagram of the overall cross-sectional structure of the utility model;

[0017] Figure 2 It is a three-dimensional structural schematic diagram of the pumping ring in the utility model;

[0018] Figure 3 It is a schematic diagram of the structure of the changing state of the pumping ring at the speed V1 in the utility model;

[0019] Figure 4 It is a schematic diagram of the structure of the changing state of the pumping ring at the speed V2 in the utility model.

[0020] Icons: 1. Cable setting tool; 2. Upper push cylinder; 3. Pumping ring; 4. Lower push cylinder; 5. Casing; 6. Petal structure. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. 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] Example 1

[0024] Please refer to Figure 1-Figure 4 shown.

[0025] The utility model provides a tool for improving the efficiency of underground pumping bridge plugs, such as Figure 1 , Figure 2 As shown, the cable sealing tool 1 is inserted into the casing 5, and includes an upper push tube 2 installed on the outer wall of the cable sealing tool 1, the upper push tube 2 is a slender tubular structure, and the internal thread opened on the inner wall of the upper push tube 2 is threadedly connected with the external thread opened on the outer wall of the cable sealing tool 1, and a pumping ring 3 is sleeved on the upper push tube 2, and a lower push tube 4 for fixing the pumping ring 3 is provided on the outer wall of the cylindrical step of the upper push tube 2, and the lower push tube 4 is threadedly connected with the upper push tube 2, and an annular gap is formed between the pumping ring 3 and the upper push tube 2; when the liquid continuously acts on the annular gap between the pumping ring 3 and the upper push tube 2, the outer edge of the pumping ring 3 gradually increases its outer diameter under the action of the liquid; the cut-off area during pumping can be changed, the pumping efficiency can be improved, and the liquid-related costs and operation time costs during operation can be reduced.

[0026] Preferably, the cable sealing tool 1 is placed on the inner wall of the end of the lower push tube 4 and is provided with an internal thread for connecting an adapter configured with a bridge plug, and the outer diameter of the bridge plug is fitted to the end face of the lower push tube 4.

[0027] In some technical solutions of the utility model, the outer diameter of the outer wall of the middle part of the upper push tube 2 gradually decreases along the flow direction of the liquid. The end of the pumping ring 3 away from the lower push tube 4 is a thin-walled structure. The inner wall of the end of the pumping ring 3 away from the lower push tube 4 is conical, and the small diameter end of the pumping ring 3 faces the side of the lower cone. This makes it easier for the pumped liquid to act smoothly in the annular gap formed between the pumping ring 3 and the upper push tube 2, which can further reduce the liquid flow required for the pumping ring 3 to have a interception effect.

[0028] In some technical solutions of the utility model, the end of the pumping ring 3 away from the push tube 4 is provided with a plurality of axial cuts along the circumference of the pumping ring 3 to form a plurality of petal structures 6. The plurality of petal structures 6 can realize multi-angle transformation under the action of pumping, which can effectively reduce the liquid annular flow velocity required for taking effect. When the pumping ring 3 takes effect on liquid interception, the flange of the pumping ring 3 will fluctuate at different angles due to different forces under the action of the pumping liquid; the opening process of the plurality of petal structures 6 is to open step by step. After the plurality of petal structures 6 are opened, the petal position will not form a complete interception, so as to avoid the sudden increase of the tension of the cable connected thereto, resulting in the cable collapse caused by the untimely release of the cable; and after the pumping ring 3 is opened, no complete interception will be formed, which is conducive to the pumping ring 3 to change the interception area during pumping in time and improve the pumping efficiency.

[0029] Preferably, the petals can be set to be unequal when necessary, so that there is a time difference when each petal of the pumping ring 3 opens, so as to achieve the purpose of slowly increasing the cable tension step by step.

[0030] In some technical solutions of the utility model, the angle of the axial cut between any two petal structures 6 is an acute angle. A plurality of axial cuts with different angles can be set on the inner conical surface of the pumping ring 3 so that it gradually opens under the flushing of the liquid, thereby avoiding the problem of sudden increase in cable tension caused by the sudden increase in thrust on the pumping ring 3 and protecting the cable from being broken.

[0031] The inner wall of the end of the pumping ring 3 away from the lower push tube 2 is conical, and the small diameter end of the pumping ring 3 faces the side of the lower cone tube 2. It is used to increase the volume of the annular gap, increase the contact volume between the pumping ring and the pumped liquid, and ensure the efficient operation of the pumping ring 3.

[0032] The working principle of this structure is: when the annular liquid flow rate is less than V1, the experimental theoretical value of V1 is 4.5m / s, and the pumping ring 3 maintains the initial state. In this state, the pumping ring 3 does not have the effect of intercepting the flow; when the pumping ring 3 is started; when the annular liquid flow rate gradually increases to V1, under the action of the liquid, the pumping ring 3 begins to deform, and the equivalent outer diameter increases. At this time, the cable tension shows an increase, and the cable needs to be released faster to increase the pumping rate; when the annular liquid flow rate exceeds V1 and gradually increases to V2, the experimental theoretical value of V2 is 7m / s. Under the action of the liquid, the pumping ring 3 continues to deform, the equivalent outer diameter continues to increase, and the pumping rate reaches the maximum value. At this time, the pumping rate is the fastest, and when the tool reaches the construction position, the time required is the shortest, and the least liquid is used.

[0033] The pumping ring has two states at the V2 flow rate:

[0034] When the initial annular gap is small: the outer diameter of the pumping ring increases until the flange fits the inner wall of the casing. At this time, the overall equivalent is that the outer diameter of the bridge plug is equal to the inner diameter of the casing;

[0035] When the initial annulus is large: the pumping ring increases to the maximum equivalent outer diameter set by itself.

[0036] Preferably, the annulus liquid flow rate refers to the difference between the flow rate of the liquid when flowing through the gap between the outer diameter of the bridge plug and the inner diameter of the casing and the bridge plug lowering speed, or the flow rate of the liquid when flowing through the gap between the outer diameter of the bridge plug and the inner diameter of the casing with the bridge plug as a reference.

[0037] In some technical solutions of the utility model, an annular groove is provided on the inner wall of the lower push tube 4, and a part of the pumping ring 3 is embedded in the groove, so as to ensure that the pumping ring 3 is stably installed in the lower push tube 4, improve the stability of the pumping ring 3 during operation, and reduce the occurrence of uncertainties caused by leaving the pumping structure underground.

[0038] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be subject to various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A tool for improving the efficiency of downhole pumping bridge plugs, characterized in that: It comprises an upper push cylinder installed on the outer wall of the cable sealing tool, a pumping ring is sleeved on the upper push cylinder, a lower push cylinder for fixing the pumping ring is provided on the outer wall of the upper push cylinder, and an annular gap is formed between the pumping ring and the upper push cylinder; when liquid continuously acts on the annular gap between the pumping ring and the upper push cylinder, the outer edge of the pumping ring gradually increases its outer diameter under the action of the liquid.

2. A tool for improving downhole pumping bridge plug efficiency according to claim 1, characterized in that: One end of the pumping ring away from the lower push cylinder is a thin-walled structure.

3. A tool for improving downhole pumping bridge plug efficiency according to claim 1, characterized in that: A plurality of axial cutouts are provided along the circumference of the pumping ring at one end of the pumping ring away from the lower push cylinder to form a petal structure.

4. A tool for improving downhole pumping bridge plug efficiency according to claim 3, characterized in that: The included angle of the axial cut between any two petal structures is an acute angle.

5. A tool for improving downhole pumping bridge plug efficiency according to claim 1, characterized in that: The outer diameter of the outer wall of the middle portion of the upper push cylinder gradually decreases along the flow direction of the liquid.

6. A tool for improving downhole pumping bridge plug efficiency according to claim 1, characterized in that: An annular groove is provided on the inner wall of the push-down cylinder, and a part of the pumping ring is embedded in the groove.

7. A tool for improving downhole pumping bridge plug efficiency according to claim 1, characterized in that: The inner wall of the end of the pumping ring away from the lower push cylinder is conical, and the small diameter end of the pumping ring faces one side of the lower cone cylinder.

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