Spraying pre-filming pipe cleaner for large-diameter pipeline

Abstract

The utility model relates to a pipe cleaner for pre-filming of a large-diameter pipeline, in particular to a pipe cleaner for pre-filming of the large-diameter pipeline. The injection pre-filming pipe cleaner for the large-diameter pipeline is stable in operation, good in top pre-filming effect and uniform in pre-filming. The large-diameter pipeline injection pre-filming pipe cleaner comprises a guide pipe cleaner and a pre-filming pipe cleaner, the periphery of the guide pipe cleaner is sleeved with a first supporting disc, the periphery of the pre-filming pipe cleaner is sleeved with a second supporting disc, and one surface of the first supporting disc and one surface of the second supporting disc are each provided with a leather cup. The pre-filming pipe cleaner comprises a head part, a cavity part and a tail part, the second supporting disc sleeves one end of the cavity part, the head part is arranged on the other surface of the second supporting disc, a first air passage penetrating through the whole tail part is arranged in the tail part, a second air passage penetrating through the whole head part is arranged in the head part, one end of the second air passage is communicated with the cavity part, and the other end of the second air passage is provided with a nozzle; the end, close to the cavity, of the second air channel is connected with a reagent channel communicated with the outside.

Description

TECHNICAL FIELD

[0001] The utility model relates to a pig, in particular to a kind of jet pre-membrane pig for large-diameter pipeline pre-membrane. BACKGROUND

[0002] Petroleum products contain a large amount of carbon dioxide, dissolved salt and hydrogen sulfide, which can easily react with the inner wall of the pipeline metal during pipeline transportation, especially in the later stage of oilfield development, due to water injection mining, the water content of the transport medium increases, and further exacerbates the corrosion of the inner wall of the pipeline, leading to buried oil and gas pipeline leakage, loss of a large amount of important materials and serious environmental pollution, and even cause disastrous accidents such as fire, explosion, etc.

[0003] In view of the problem of pipeline inner wall corrosion, the international community usually delays corrosion by adding corrosion inhibitor in the pipeline, but there are many factors that affect the corrosion inhibition of corrosion inhibitor, in addition to the nature, structure and other factors of the corrosion inhibitor and metal itself, the corrosion inhibitor pre-membrane process method is also crucial.

[0004] At present, domestic and foreign oil and gas pipeline corrosion inhibitor pre-membrane technology mostly uses pig type pre-membrane process, the traditional pig type pre-membrane process mainly uses the gas pressure difference before and after the pig to push the pig group carrying the corrosion inhibitor slug forward. In the pre-membrane process, the gas pressure difference applied to the gas before and after the pig is easy to cause the pig to tilt, which causes the corrosion inhibitor slug carried by the pig group to not fully contact the inner wall of the pipeline, affecting the pipeline pre-membrane quality, especially the pre-membrane effect of the top of the pipeline is poor. The traditional pig type pre-membrane process is not ideal for the pre-membrane effect of the pipeline. UTILITY MODEL CONTENT

[0005] The utility model solves the technical problem to provide a kind of jet pre-membrane pig for large-diameter pipeline, which is stable in operation, has good top pre-membrane effect and uniform pre-membrane.

[0006] The utility model relates to a large -diameter pipeline injection pre -membrane pig, including a kind of large -diameter pipeline injection pre -membrane pig, it is characterized by: including guide pig and pre -membrane pig, the first support disc for supporting it is peripherally equipped to the guide pig, the second support disc for supporting it is peripherally equipped to the pre -membrane pig, the first support disc and second support disc one surface are all provided with leather cup, the pre -membrane pig includes head, cavity and tail, the second support disc is sleeved in cavity one end, the head is set on the other surface of second support disc, the head is connected with cavity by second support disc, the cavity is hollowly arranged, the other end of cavity and tail are fixedly connected, the first air passage that is penetrated through its entirety is arranged in the tail, the first air passage transports gas from outside to cavity, the second air passage that is penetrated through its entirety is arranged in the head, one end of the second air passage is communicated with cavity, the second air passage is provided with nozzle on the other end, the second air passage transports gas from cavity to outside, reagent channel that is communicated with outside is connected to the second air passage close to cavity end, and reagent is inhaled into second air passage by airflow.

[0007] The utility model discloses a large -diameter pipeline injection pre -membrane pig, wherein the second air passage is equipped with three, and the reagent channel that is communicated with outside is connected to the second air passage close to cavity end every one, and the other end is provided with nozzle.

[0008] The utility model discloses a large -diameter pipeline injection pre -membrane pig, wherein the nozzle is venturi nozzle.

[0009] The utility model discloses a large -diameter pipeline injection pre -membrane pig, wherein the pre -membrane pig cavity is equipped with third support disc in close to tail one end, and leather cup is arranged on the one surface of third support disc.

[0010] The utility model discloses a large -diameter pipeline injection pre -membrane pig, wherein the guide pig includes the pig body of columnar shape, and the first support disc is sleeved on the pig body.

[0011] The utility model discloses a large -diameter pipeline injection pre -membrane pig, wherein the fourth support disc is also provided with leather cup on its surface and is peripherally sleeved on the guide pig.

[0012] The utility model discloses a large -diameter pipeline injection pre -membrane pig differs from prior art, and the utility model discloses two pig, a guide pig one pre -membrane pig, and every pig is equipped with two support disc, and its steady support, and support disc all is equipped with the leather bowl, and the leather bowl and the inner wall of large -diameter pipeline abutment form the airtight space, when pre -membrane for large -diameter pipeline, in turn two pig slide into the large -diameter pipeline, and the corrosion inhibitor is filled between two pig, under the push of gas source, and two pig and corrosion inhibitor move along the pipeline forward, and the corrosion inhibitor molecule and the inner wall of pipeline contact fully, and form the film on the inner wall of pipeline.

[0013] The utility model discloses a large -diameter pipeline injection pre -membrane pig at least includes following beneficial effects:

[0014] (1) adopt double pig design and every pig is equipped with two support disc, and when working, pig runs more steady in the pipeline and is not easy to incline, so that the corrosion inhibitor between two pig can contact fully with the inner wall of pipe, and pre -membrane is more uniform.

[0015] (2) pre -membrane pig is provided with air passage, reagent channel and nozzle, utilizes Bernoulli effect, and the corrosion inhibitor is carried by gas and is sprayed to the top of pipeline from nozzle, solves the difficult problem of pre -membrane of the top of pipe arm, and the top pre -membrane effect is good, and the corrosion of pipeline is reduced.

[0016] The utility model will be further described in connection with the drawings. DRAWINGS

[0017] Figure 1 It is the three -dimensional structure schematic diagram of the utility model discloses a large -diameter pipeline injection pre -membrane pig;

[0018] Figure 2 It is the front view of the utility model discloses a large -diameter pipeline injection pre -membrane pig;

[0019] Figure 3 It is the section along Figure 2 A-A line of the utility model discloses a large -diameter pipeline injection pre -membrane pig;

[0020] Figure 4 It is the right view of the utility model discloses a large -diameter pipeline injection pre -membrane pig;

[0021] Figure 5 It is the three-dimensional structure schematic view of the head of the pre-membrane pig;

[0022] Figure 6 It is the internal structure schematic view of the head of the pre-membrane pig;

[0023] Figure 7 It is the three-dimensional structure schematic view of the first supporting disc;

[0024] Figure 8 It is the three-dimensional structure schematic view of the guiding pig;

[0025] Figure 9 It is the schematic view of the large-diameter pipeline jet pre-membrane pig of the utility model being installed in the pipeline.

[0026] Reference signs:

[0027] 01-guiding pig; 11- leather cup; 12-first supporting disc; 13-fourth supporting disc; 02-pre-membrane pig; 21-head; 211-second air channel; 212-reagent channel; 213-nozzle; 214-venturi nozzle; 22-cavity; 23-tail; 231-first air channel; 24-second supporting disc; 25-third supporting disc; 03-pipeline; 31-conduit mouth. DETAILED DESCRIPTION

[0028] As Figures 1-3 shown, the large-diameter pipeline 03 jet pre-membrane pig 02 of the utility model includes the guiding pig 01 and the pre-membrane pig 02, the first supporting disc 12 for supporting is sleeved on the outer periphery of the guiding pig 01, the second supporting disc 24 for supporting is sleeved on the outer periphery of the pre-membrane pig 02, the leather cup 11 is arranged on the surface of the first supporting disc 12 and the second supporting disc 24, the pre-membrane pig 02 includes the head 21, the cavity 22 and the tail 23, the second supporting disc 24 is sleeved in one end of the cavity 22, the head 21 is arranged on the other surface of the second supporting disc 24, and the cavity 22 is connected with the second supporting disc 24, the cavity 22 is hollow, the other end of the cavity 22 is fixedly connected with the tail 23, the first air channel 231 that penetrates the whole is arranged in the tail 23, and gas is transported from the outside to the cavity 22, the second air channel 211 that penetrates the whole is arranged in the head 21, one end of the second air channel 211 is communicated with the cavity 22, and the other end is provided with the nozzle 213, and gas is transported from the cavity 22 to the outside, the reagent channel 212 that communicates with the outside is connected to the end of the second air channel 211 close to the cavity 22, and the reagent is sucked into the second air channel 211 by airflow.

[0029] As Figure 9As shown, when pre-membrane of pipeline 03, the guide pig 01 and pre-membrane pig 02 need to be put into the pipeline 03 in turn, then the corrosion inhibitor is injected between the guide pig 01 and pre-membrane pig 02 through the pipe port 31 on the pipeline 03, then the pipe port 31 is closed, and the gas is released behind the pre-membrane pig 02 through the gas source to push it to advance in the pipeline 03, as shown in the figure Figure 1 As shown, the pre-membrane pig 02 is composed of a head 21, a cavity 22 and a tail 23, and the second support disc 24 is firmly sleeved on the right end of the cavity 22, as shown in the figure Figure 7 As shown, the second support disc 24 is provided with threaded holes on the left and right surfaces, the leather cup 11 is fixed on the left surface of the second support disc 24 through a screw rod, the outer periphery of the leather cup 11 is circular and abuts against the inner wall of the pipeline 03 to seal the pipeline 03, and the guide pig 01 is supported in the pipeline 03 through the leather cup 11, the head 21 is conical and provided with a flange on the left end, a plurality of through holes are arranged on the flange, and the head 21 is firmly fixed on the right surface of the second support disc 24 through screw threads connecting the through holes on the flange of the head 21 and the threaded holes on the right surface of the second support disc 24, that is, the head 21 is firmly connected with the right end of the cavity 22, and the tail 23 is firmly connected with the left end of the cavity 22 through bolts or welding, so that the head 21, the cavity 22 and the tail 23 jointly form the combined structure of the pre-membrane pig 02.

[0030] As shown in the figure Figure 8 As shown, the guide pig 01 is designed in one piece, the first support disc 12 is sleeved on the outer periphery thereof, and the leather cup 11 is arranged on the first support disc 12 to achieve the purpose of guiding and sealing the pipeline 03.

[0031] As shown in the figure Figure 3 As shown, the cavity 22 of the pre-membrane pig 02 is cylindrical and hollow, the first gas channel 231 penetrates the tail 23 from bottom to top and then to right, or penetrates left and right, and the outside is communicated with the cavity 22 through the first gas channel 231, the head 21 is conical, the second gas channel 211 penetrates the head 21 from left to right and then to top, the right end of the second gas channel 211 is connected with the nozzle 213, the cavity 22 is communicated with the outside through the second gas channel 211 to ensure that the corrosion inhibitor can be sprayed from the nozzle 213 to the top of the pipe wall, thereby forming a gas channel from the tail 23 to the cavity 22 and then to the head 21, and the reagent channel 212 is arranged in the flange of the head 21 from bottom to top, the lower end of the reagent channel 212 is communicated with the outside, that is, opposite to the bottom of the pipe wall, and the upper end is communicated with the second gas channel 211, and there is a gap between the bottom of the flange and the bottom of the pipe wall to ensure that the reagent channel 212 is not abraded.

[0032] As shown in the figure Figure 9As shown, during pre-filming, the gas source pushes the pre-filming pig 02 forward from the rear, in the process, the corrosion inhibitor molecules fully contact the inner wall of the pipeline 03, forming a uniform, dense and strongly adhered thin film with corrosion inhibition on the inner wall of the pipeline 03, wherein the gas is nitrogen, which prevents air oxidation and corrosion of the pipe wall and sparks generated during pre-filming to cause explosion, thereby improving the safety of pre-filming of the pipeline 03. While the pre-filming pig 02 advances, nitrogen enters the cavity 22 from the first gas passage 231 of the tail 23 of the pre-filming pig 02, then flows into the second gas passage 211, and finally flows out from the nozzle 213. According to Bernoulli's effect, when the nitrogen flows out from the nozzle 213, the gas is accelerated due to the sudden reduction in gas flow area, and the gas in the second gas passage 211 generates negative pressure to form a local vacuum. The corrosion inhibitor accumulated at the bottom of the pipe wall is sucked into the reagent passage 212 under the action of the pressure difference, and is carried by the continuously flowing nitrogen in the second gas passage 211 and sprayed onto the top of the pipe wall through the nozzle 213. The corrosion inhibitor sprayed on the top of the pipe wall flows down the pipe wall, making the pre-filming more complete.

[0033] As shown in Figures 4-6 The second gas passage 211 is provided with three, and each second gas passage 211 is connected with a reagent passage 212 communicating with the outside near the end of the cavity 22, and the other end is provided with a nozzle 213.

[0034] As shown in Figure 5 The gas inlets of the three second gas passages 211 in the head 21 are arranged on the plane at the left end of the head 21 and communicate with the cavity 22, the gas outlets of the three second gas passages 211 are uniformly arranged on the arc surface of the conical head 21 opposite the top of the pipe wall, and the nozzle 213 is installed on the gas outlet to ensure that the nozzle 213 can spray the corrosion inhibitor to the top and maintain the maximum coverage area. Each second gas passage 211 is connected with a reagent passage 212, and the second gas passage 211 and the reagent passage 212 can be rectangular or circular pipes, but preferably circular, because the circular pipe has small fluid flow resistance, strong pressure bearing capacity and strong sealing, which is more conducive to fluid flow. The diameter of the reagent passage 212 is smaller than that of the second gas passage 211, and under the same gas pressure, the small-diameter channel has greater pressure bearing capacity, which is more conducive to the suction of the corrosion inhibitor. Nitrogen enters the cavity 22 from the first gas passage 231 of the tail 23, and then flows into the three second gas passages 211 from the cavity 22. The three second gas passages 211 can be arranged intersecting each other or independently. The nitrogen flowing into the second gas passage 211 is sprayed out from the nozzle 213. Under the Bernoulli effect, the corrosion inhibitor accumulated at the bottom of the pipe wall is sucked into the reagent passage 212, and then carried by the continuously flowing nitrogen in the second gas passage 211 and sprayed onto the top of the pipe wall through the nozzle 213. During the pre-filming process of the large-diameter pipeline jet pre-filming pig, even if it tilts due to the pressure difference between the front and rear, it can also completely pre-film the inner wall of the pipeline 03, that is, the corrosion inhibitor fully covers the inner wall of the pipeline 03.

[0035] As shown in Figure 4The nozzle 213 is a Venturi nozzle 214.

[0036] The three nozzles 213 are all Venturi nozzles 214, which have the characteristics of small pressure loss, stable flow coefficient and high fluid control, so that the Venturi nozzles 214 can efficiently and uniformly spray the corrosion inhibitor to the top of the pipe wall, thereby enhancing the pre-film effect on the top of the pipe wall.

[0037] As shown in Figures 1-3 The pre-film pig 02 has a third supporting disc 25 sleeved on the cavity 22 near one end of the tail 23, and the third supporting disc 25 has a cup 11 on one surface.

[0038] The four supporting discs have the same structure, and the cup 11 is connected to the left surface of the third supporting disc 25 by a screw rod, and the cup 11 on the third supporting disc 25 and the cup 11 on the second supporting disc 24 have the same direction, so that the pre-film pig 02 is stably supported in the pipeline 03 by the two supporting discs and the cups 11 on the supporting discs, and when the pre-film pig is sprayed in the pipeline 03, the pressure difference between the front and back of the pipeline 03 is maintained, and the second supporting disc 24 and the third supporting disc 25 and the cups 11 fixed on the surfaces thereof can be replaced, thereby prolonging the service life of the pre-film pig 02 and meeting the pre-film needs of pipelines 03 of different diameters.

[0039] The utility model discloses a large -diameter pipeline injection pre -film pig, and the guiding pig 01 comprises the pig body that is columnar, and the pig body has a first supporting disc 12 sleeved on it.

[0040] As shown in Figure 8 And Figure 9 The fourth supporting disc 13 is also sleeved on the outer periphery of the guiding pig 01, and the cup 11 is also arranged on the surface of the fourth supporting disc 13, so that the guiding pig 01 is stably supported.

[0041] The guiding pig 01 is designed in one piece, and one supporting disc is sleeved on each of the left and right ends, and the cups 11 fixed on the same side surfaces of the two supporting discs by screw rods can be the first supporting disc 12 or the fourth supporting disc 13, and the guiding pig 01 is supported in the pipeline 03 by the two supporting discs and the cups 11, so that the pipeline 03 is blocked by the guiding pig 01 and the pre-film pig 02 to form a closed space, and the corrosion inhibitor filled between them is prevented from leaking.

[0042] When the pipeline 03 is pre-filmed, as shown in Figure 9As shown, the pipeline 03 is provided with a catheter port 31, the guide pig 01 is first put into the pipeline 03, the pre-film pig 02 is put into the pipeline 03 after a certain distance, then the pipeline 03 is filled with the corrosion inhibitor between the two pigs through the catheter port 31, a stable corrosion inhibitor plug is formed, the pre-film pig 02 is pushed forward in the pipeline 03 by the nitrogen gas behind the pig, at the beginning, the corrosion inhibitor between the two pigs is in a saturated state, as the pig advances, the corrosion inhibitor fully contacts the inner wall of the pipeline 03, and a uniform, dense and strongly adhesive film with corrosion inhibition is formed on the inner wall of the pipeline 03, however, the inner wall of the pipeline 03 has many pits due to welding or long-term corrosion, as the pig advances, the corrosion inhibitor is gradually consumed, when the leather cup 11 passes through the pits or welded parts on the pipe wall, a gap is formed between the pipe wall and the leather cup 11, the nitrogen gas flows into the corrosion inhibitor cavity between the guide pig 01 and the pre-film pig 02 through the gap, at this time, the corrosion inhibitor is not saturated and cannot fully contact the inner wall of the pipeline, especially the top of the pipe wall, at the same time, the nitrogen gas behind the pre-film pig 02 enters the cavity 22 through the first gas channel 231, and then flows to the Venturi nozzles 214 through the three second gas channels 211, when the nitrogen gas is sprayed out of the Venturi nozzles 214, the nitrogen gas flow area suddenly reduces and accelerates under the Bernoulli effect, the gas in the second gas channel 211 generates negative pressure to form a local vacuum, the corrosion inhibitor accumulated at the bottom of the pipe wall is sucked into the reagent channel 212 under the action of the pressure difference, and then is carried by the continuously flowing nitrogen gas in the second gas channel 211 and sprayed on the top of the pipe wall through the two Venturi nozzles 214 to pre-film the top of the pipe wall, and the corrosion inhibitor sprayed on the top of the pipe wall flows down along the pipe wall, further strengthening the pipe wall pre-film effect and making the pre-film more uniform, after the pre-film is completed, the two pigs are pushed out by the nitrogen gas behind the pre-film pig 02.

[0043] It should be noted that the terms "center", "upper", "lower", "front", "back", "left", "right", "middle" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0044] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected, it can be mechanically connected, or it can be electrically connected, it can be directly connected, or it can be indirectly connected through an intermediate medium. For ordinary skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0045] The above-described embodiments are merely preferred embodiments of the present application, and are not intended to limit the scope of the present application. Without departing from the design spirit of the present application, various modifications and improvements to the technical solutions of the present application made by those of ordinary skill in the art shall fall within the protection scope of the present application as defined by the claims.

Claims

1. A large bore pipeline jet prefilming pig characterized by: The application relates to a pigging device comprising a guide pig and a pre-membrane pig, the guide pig is peripherally sleeved with a first supporting disc for supporting the guide pig, the pre-membrane pig is peripherally sleeved with a second supporting disc for supporting the pre-membrane pig, the first supporting disc and the second supporting disc are both provided with a leather cup on one surface, the pre-membrane pig comprises a head, a cavity and a tail, the second supporting disc is sleeved at one end of the cavity, the head is arranged on the other surface of the second supporting disc, the head is connected with the cavity through the second supporting disc, the cavity is hollow, the other end of the cavity is fixedly connected with the tail, a first gas channel penetrating through the whole tail is arranged in the tail, the first gas channel is used for conveying gas from the outside to the cavity, a second gas channel penetrating through the whole head is arranged in the head, one end of the second gas channel is communicated with the cavity, a nozzle is arranged at the other end of the second gas channel, the second gas channel is used for conveying gas from the cavity to the outside, a reagent channel communicated with the outside is connected with the second gas channel close to the cavity end, and the reagent is sucked into the second gas channel through the airflow.

2. A large bore pipeline jet prefilming pig according to claim 1, characterized in that: The second gas channel is provided with three, each second gas channel is connected with a reagent channel communicated with the outside close to the cavity end, and the other end is provided with a nozzle.

3. A large bore pipeline jet prefilming pig according to claim 2, characterized in that: The nozzle is a Venturi nozzle.

4. A large bore pipeline jet prefilming pig according to claim 3, characterized in that: The pre-membrane pig is sleeved with a third supporting disc close to one end of the cavity, and the third supporting disc is provided with a leather cup on one surface.

5. A large bore pipeline jet prefilming pig according to claim 4, characterized in that: The guide pig comprises a columnar pig body, and the pig body is sleeved with a first supporting disc.

6. A large bore pipeline jet prefilming pig according to claim 5, characterized in that: The guide pig is also sleeved with a fourth supporting disc on the periphery and is also provided with a leather cup on the surface.

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