Drainage equipment for gas production wells

Abstract

The present application provides a kind of drainage equipment for gas production well, including the cylindrical shell, the shell outside is closed and forms internal containing space, the shell is made of soluble material, the outer side of the shell is sleeved with annular mounting section, the mounting section is connected with the calipers that can rely on its own elasticity to stretch out, the calipers are also connected with the tight binding device that limits its outward stretching, the internal containing space of the shell is also provided with material that can react sharply with water and release energy, the mounting section, positioning caliper and the tight binding device are also made of soluble material.The beneficial effects of the present application increase the pressure of formation instantaneously by the energy generated by the reaction, break the pressure balance in the wellbore, discharge the liquid from the wellbore, and solve the technical problems that conventional measures cannot solve.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of gas field stimulation, and relates to a gas well shaft drainage gas production device. BACKGROUND

[0002] Most of the gas well production contains water or condensate liquid, when the formation pressure decreases, the pressure of the gas well decreases, the gas cannot effectively carry the liquid in the wellbore, and the liquid accumulates in the wellbore string. The liquid in the wellbore gradually accumulates and further causes the production to decrease, until the downhole pressure and the pressure of the liquid section in the wellbore reach balance, and the production stops.

[0003] At present, the existing foam drainage technology and the plunger drainage process technology are all process measures for drainage gas production by using formation energy, are all measures for drainage by using formation pressure, cannot assist in increasing the pressure of the formation, and all have certain limitations. SUMMARY

[0004] The purpose of the present application is to provide a drainage gas production device for a gas well shaft, which can generate energy (similar to explosion) by itself, instantaneously increases the pressure of the formation by the energy generated by the reaction, breaks the pressure balance between the liquid accumulation section of the wellbore and the formation, and drains the liquid out of the wellbore, thereby solving the problem that the conventional measures are difficult to drain the liquid when the formation pressure is insufficient.

[0005] The technical scheme adopted by the present application is a drainage equipment for a gas well, which comprises a cylindrical shell, the shell is closed outside and forms an internal containing space, the shell is made of a soluble material, characterized in that an annular mounting section is sleeved on the outer side of the shell, the mounting section is connected with a clamp capable of extending outward by relying on its own elasticity, the clamp is also connected with a binding device for limiting the outward extension of the clamp, the internal containing space of the shell is also provided with a material capable of releasing energy by undergoing a violent chemical reaction when meeting water, and the mounting section, the positioning clamp and the binding device are all made of a soluble material.

[0006] As a further improvement of the embodiment of the present application, the mounting section is adhered to the outer side of the shell by water-soluble glue.

[0007] As a further improvement of the embodiment of the present application, the outer side of the shell is provided with a blocking portion protruding outward around the outer periphery of the shell, and the outer diameter of the blocking portion is greater than the inner diameter of the mounting section.

[0008] As a further improvement of the embodiment of the present application, the outer side of the shell is provided with an installation portion recessed inward and capable of cooperating with the mounting section.

[0009] As a further improvement of the embodiment of the present application, the positioning calipers can extend outward and form an angle of no more than 90 degrees with the side of the shell after the binding device is dissolved.

[0010] As a further improvement of the embodiment of the present application, the material that can react with water and release energy is any one or a combination of multiple of trimethylaluminum, calcium carbide, magnesium carbide, metallic potassium, metallic lithium, metallic cesium, and metallic sodium.

[0011] As a further improvement of the embodiment of the present application, the mounting node and the positioning calipers are integrally formed.

[0012] As a further improvement of the embodiment of the present application, the dissolution time of the shell is less than the dissolution time of the positioning calipers, and the dissolution time of the binding device is less than the dissolution time of the shell.

[0013] As a further improvement of the embodiment of the present application, the calipers are arranged at the bottom end of the mounting node and include multiple tooth-shaped protrusions arranged around the mounting node.

[0014] As a further improvement of the embodiment of the present application, the tooth-shaped protrusions include a support portion and a toothed portion connected to each other, the toothed portion is arranged at the bottom end of the support portion and extends outward along the extension direction of the support portion, and forms an obtuse angle with the extension direction of the support portion.

[0015] The present application has the advantages and positive effects that:

[0016] The shell is made of water-soluble resin or EVA polyethylene alcohol, and contains substances that can react with water to generate energy. The shell is provided with multiple water-soluble positioning calipers around the cylinder. Before the water-soluble positioning calipers slide to the predetermined position in the wellbore, they are in a contracted state. After the water-soluble positioning calipers slide to the predetermined position in the wellbore, the water-soluble switch that contracts the calipers is melted, the calipers are opened, and the calipers are clamped on the inner wall of the wellbore at the predetermined position, stopping the calipers from sliding deeper into the wellbore. After the shell is dissolved and the substances inside the shell come into contact with water, the substances react to generate energy. The energy is instantaneously generated, like a cannonball being fired from a cannon, to lift the water at the top to the ground. The liquid level in the wellbore is lowered, and the pressure at the bottom of the liquid level is increased. The gas well can be produced, and after production, the gas well can carry the liquid in the wellbore out of the wellbore to restore the production of the gas well. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0018] Figure 1 is a cross-sectional structure schematic diagram of a conical soluble pipeline pig of the present application;

[0019] In the figure, the shell 1, the positioning calipers 2, the mounting section 3, the mounting part 4, the blocking part 5. DETAILED DESCRIPTION

[0020] The present application will now be described in detail by way of specific embodiments illustrated in the drawings. However, these embodiments do not limit the present application, and the changes in structure, method, or function made by those skilled in the art based on these embodiments are included in the scope of the present application.

[0021] In various drawings of the present application, certain dimensions of structures or parts are exaggerated relative to other structures or parts for the purpose of illustration, and thus only serve to illustrate the basic structure of the subject matter of the present application.

[0022] In addition, the terms such as "upper", "above", "lower", "below" and the like used herein to describe spatial relative positions are for the purpose of description of the relationship of one unit or feature to another unit or feature as shown in the drawings. The spatial relative position terms can be intended to include different orientations of the device in use or operation in addition to the orientation shown in the drawings. For example, if the device in the drawing is turned over, the unit described as being "below" or "under" the other unit or feature will be "above" the other unit or feature. Therefore, the exemplary term "below" can encompass both the upward and downward orientations. The device can be oriented in other ways (rotated 90 degrees or other orientations), and the spatially related descriptions used herein are interpreted accordingly.

[0023] As Figure 1As shown in the figure, the drainage device for gas well comprises a cylindrical shell, which is closed outside and forms an internal containing space, and is made of soluble material, characterized in that the outer side of the shell is sleeved with a ring-shaped mounting section, the mounting section is connected with a caliper capable of extending outward by its own elasticity, the caliper is further connected with a binding device for limiting its outward extension, the internal containing space of the shell is further provided with a material capable of undergoing violent chemical reaction and releasing energy when meeting water, and the mounting section, the positioning caliper and the binding device are all made of soluble material. The mounting section is adhered to the outer side of the shell by water-soluble glue. The outer side of the shell is provided with a prismatic blocking part protruding outward around the outer periphery of the shell, and the outer diameter of the blocking part is greater than the inner diameter of the mounting section. The outer side of the shell is provided with a mounting part recessed inward and capable of cooperating with the mounting section. The positioning caliper can extend outward after the binding device is dissolved, and forms an angle of not more than 90 degrees with the side of the shell. After the binding device is removed, the caliper deforms by its own elasticity, extends outward, forms an angle with the side of the shell, and closely contacts and fixes with the inner wall of the gas well.

[0024] As a further improvement of the embodiment of the present application, the material capable of undergoing chemical reaction and releasing energy when meeting water is any one or a combination of multiple of trimethylaluminum, calcium carbide, magnesium carbide, metallic potassium, metallic lithium, metallic cesium and metallic sodium. The mounting section and the positioning caliper are integrally formed. The dissolution time of the shell is less than the dissolution time of the positioning caliper, and the dissolution time of the binding device is less than the dissolution time of the shell. The caliper is arranged at the bottom end of the mounting section and comprises multiple tooth-shaped protruding parts arranged around the mounting section.

[0025] Preferably, the binding device is a belt-shaped part attached to the outer side of the positioning caliper. The binding device is connected to the shell by soluble glue, and the positioning caliper is constrained in a contracted state.

[0026] Preferably, the binding device is a wire-shaped ring-shaped part wrapped around or sleeved on the outer side of the positioning caliper. In order to further reduce the processing difficulty, a wire made of soluble material can be selected to wrap the binding device around the outer periphery of the shell, and the positioning caliper is opened after the binding device is dissolved, and the well wall is clamped to achieve positioning.

[0027] Preferably, the positioning caliper is multiple and arranged at different heights of the shell. Through the design of multiple positioning calipers, the clamping with the well wall can be better achieved, and the positioning can be achieved.

[0028] Preferably, the positioning caliper is a blocking claw capable of extending outward, and the extending direction of the blocking claw forms an angle with the shell. Through the reverse extending blocking claw, the positioning can be more firm, and the blocking claw can better clamp the well wall under the action of gravity.

[0029] Preferably, the shell is pre-prepared with a mounting portion for mounting the positioning calipers, the positioning calipers are provided with a ring-shaped sleeve matched with the mounting portion, and the blocking claws are evenly distributed around the sleeve. The mounting portion is provided by pre-provisioning on the outer periphery of the shell, which can shorten the construction time and improve work efficiency.

[0030] Preferably, the material capable of generating chemical reaction and releasing energy when coming into contact with water is any one or a combination of multiple of trimethylaluminum, calcium carbide, magnesium carbide, metallic potassium, metallic lithium, metallic cesium, and metallic sodium. Of course, the foregoing materials are only a part of materials capable of achieving this function, and one or more combinations can be selected for use.

[0031] Preferably, the shell is in a columnar shape. The shape of the shell is determined according to the size of the well wall, so that it can better enter the well bottom and be clamped with the well wall.

[0032] Preferably, the dissolution time of the shell is less than the dissolution time of the positioning calipers, and the dissolution time of the fastening device is less than the dissolution time of the shell. The fastening device needs to be dissolved more quickly so that the positioning calipers can work more quickly. This can be achieved by reducing the thickness or width of the material or using a different soluble material from the positioning calipers.

[0033] Preferably, the tooth-shaped protruding portion includes a support portion and a toothed portion connected to each other, the toothed portion is provided at the bottom end of the support portion and extends outward along the extension direction of the support portion, and forms an obtuse angle with the extension direction of the support portion. After losing the restraint of the fastening device, the support portion can extend outward by a certain angle by virtue of its elasticity, and the toothed portion that is spread outward can better clamp the well wall, thereby providing better positioning and stabilizing effects.

[0034] In use, the drainage gas recovery device matched with the inner diameter of the gas well is put into the gas well that cannot produce gas due to liquid accumulation. The size and shape of the shell ensure that it can maintain a fixed posture when falling in the well. When falling to the liquid accumulation position, the drainage gas recovery device stops falling and comes into contact with the liquid accumulation. The liquid accumulation first dissolves the fastening device, the calipers lose the external restraint, and extend outward by a certain angle by virtue of their own elasticity, and form a certain inclination angle with the side of the shell, until they are in close contact with the inner wall of the well, forming a large reverse force that hinders the upward movement of the drainage gas recovery device, so that it can be relatively stably fixed at a specific position. After the shell is dissolved by continuing to contact with the liquid, the material capable of generating chemical reaction and releasing energy when coming into contact with water in the shell reacts violently with water, instantaneously releasing huge energy, so that the liquid accumulation in the well is like a shell from a cannon barrel, and the liquid at the top is lifted to the ground. The liquid column height in the wellbore is reduced, the pressure at the bottom of the liquid column is increased, and the gas well can produce gas. In order to achieve the purpose of restoring production, the drainage gas recovery device can also be put in multiple times at different times until the gas well restores production.

[0035] Although the specific embodiments of the present application have been described above, it is understood by those skilled in the art that these are merely illustrative, the scope of protection of the present application is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of the present application, and these changes and modifications all fall within the scope of protection of the present application.

[0036] It should be understood that although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the present specification is described in this way only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that those skilled in the art can understand.

[0037] The series of detailed descriptions listed above are only specific descriptions of the feasible embodiments of the present application, and are not intended to limit the scope of protection of the present application, and any equivalent embodiments or changes made without departing from the spirit of the present application should be included within the scope of protection of the present application.

Claims

1. A drainage apparatus for a gas production well, comprising a cylindrical casing which is closed on the outside and forms an internal accommodation space, the casing being made of a soluble material, characterized in that The outer side of the shell is sleeved with a ring-shaped mounting section, the mounting section is connected with a caliper capable of extending outward by its own elasticity, the caliper is arranged at the bottom end of the mounting section and includes a plurality of tooth-shaped protruding parts arranged around the mounting section, the tooth-shaped protruding parts include a support part and a toothed part connected with each other, the toothed part is arranged at the bottom end of the support part and extends outward along the extension direction of the support part, forms an obtuse angle with the extension direction of the support part, the caliper is also connected with a binding device for limiting the outward extension of the caliper, the internal space of the shell is also provided with a material capable of generating a violent chemical reaction and releasing energy when meeting water, the mounting section, the caliper and the binding device are all made of soluble material, the dissolution time of the shell is less than the dissolution time of the caliper, and the dissolution time of the binding device is less than the dissolution time of the shell.

2. The drainage apparatus for gas production wells according to claim 1, characterized by The mounting section is adhered to the outer side of the shell by water-soluble glue.

3. The drainage apparatus for gas production wells according to claim 1, characterized by The outer side of the shell is provided with a ridge-shaped blocking part protruding outward around the outer periphery of the shell, and the outer diameter of the blocking part is greater than the inner diameter of the mounting section.

4. The drainage apparatus for gas production wells according to claim 1, characterized by The outer side of the shell is provided with an inwardly recessed mounting part which can be matched with the mounting section.

5. The drainage apparatus for gas production wells according to claim 1, wherein After the binding device is dissolved, the caliper can extend outward and form an angle of not more than 90 degrees with the side of the shell.

6. The drainage apparatus for gas production wells according to claim 1, wherein The material capable of generating a chemical reaction and releasing energy when meeting water is any one or a combination of multiple of trimethylaluminum, calcium carbide, magnesium carbide, metallic potassium, metallic lithium, metallic cesium and metallic sodium.

7. The drainage apparatus for gas production wells according to claim 1, wherein The mounting section and the caliper are integrally formed.

Images