CN211201884U - Foam acid ground injection system - Google Patents
Foam acid ground injection system Download PDFInfo
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- CN211201884U CN211201884U CN201921669333.8U CN201921669333U CN211201884U CN 211201884 U CN211201884 U CN 211201884U CN 201921669333 U CN201921669333 U CN 201921669333U CN 211201884 U CN211201884 U CN 211201884U
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Abstract
The utility model provides a sour ground injection system of foam, the sour ground injection system of foam set up the subaerial of oil well head, and it includes: the fracturing pump comprises a liquid phase modulation device, a fracturing pump-in device communicated with the outlet end of the liquid phase modulation device, a gas phase device and a foam generating device; the exit end of device is gone into to fracturing pump and the exit end of gaseous phase device all with foam generating device's entry end intercommunication, foam generating device is used for injecting into foam acid in the oil well, in order to remove shutoff in the stratum around the oil well, the utility model provides a foam acid ground injection system reduces the purpose to the damage of stratum when realizing knowing the jam that solid phase and the liquid phase of removing drilling fluid and completion fluid caused in the stratum around the wall of a well.
Description
Technical Field
The utility model relates to an oil field oil production engineering technical field, in particular to sour ground injection system of foam.
Background
At present, in the technical field of oil exploitation, well drilling and completion are essential important links in the oil exploitation process. During drilling and completion, the drilling and completion fluids inevitably come into contact with the formation for a long time and over a large area. In the contact process, the solid phase and the liquid phase of the drilling fluid and the completion fluid can enter the stratum around the well wall of the oil well to form a large-scale pollution zone and block the stratum around the well wall of the oil well, so that the seepage resistance of the fluid in the stratum is increased, the oil layer is seriously damaged compared with the oil well, the productivity of part of the oil well is reduced, and the exploitation effect is not ideal.
Acidification is a main process for solving the problem of blockage in the operation of an oil well in an oil field, and the acidification is carried out on the stratum around the oil well by utilizing acid liquor to react with rocks and plugging substances of the stratum so as to form more erosion channels and remove the plugging and pollution of the stratum around the oil well.
However, the conventional liquid acid is adopted to remove pollution and plugging of the stratum around the oil well through acidification, and certain damage is easily caused to the stratum.
SUMMERY OF THE UTILITY MODEL
The utility model provides a sour ground injection system of foam realizes the purpose of reducing the damage to the stratum in the time of the jam that solid phase and the liquid phase that removes drilling fluid and completion fluid caused in the stratum around the wall of a well.
The embodiment of the utility model provides a sour ground injection system of foam sets up the subaerial of oil wellhead, include: the fracturing pump comprises a liquid phase modulation device, a fracturing pump-in device communicated with the outlet end of the liquid phase modulation device, a gas phase device and a foam generating device; the outlet end of the fracturing pump device and the outlet end of the gas phase device are both communicated with the inlet end of the foam generating device, and the foam generating device is used for injecting generated foam acid into the oil well so as to remove plugging in the stratum around the oil well.
The above-mentioned foam acid ground injection system, optionally, the inlet end of the foam generating device includes a first inlet end and a second inlet end, wherein the outlet end of the fracturing pump-in device and the outlet end of the gas phase device are respectively communicated with the first inlet end and the second inlet end of the foam generating device.
The above-mentioned ground injection system for foam acid, optionally, the liquid phase modulation device comprises: the acid solution tank and the clear water tank are communicated with the inlet end of the fracturing pump-in device.
The above-mentioned foamed acid surface injection system, optionally, the fracturing pump-in device is a fracturing pump truck.
The above-mentioned ground injection system for the foam acid, optionally, the gas phase device comprises a storage device for storing a gas phase or a gas phase generation device for generating a gas phase.
In the above-mentioned ground injection system for foamed acid, the gas phase stored in the storage device may optionally comprise nitrogen, carbon dioxide or air.
In the above ground injection system for foamed acid, the gas phase generating device is optionally a liquid nitrogen pump truck or a liquid nitrogen pump tank.
The above-mentioned foam acid ground injection system, optionally, further comprises: a first end of the first connecting pipeline is communicated with the outlet end of the foam generating device, and a second end of the first connecting pipeline extends into the oil well;
wherein, at least one first valve body is arranged on the first connecting pipeline.
The above-mentioned foam acid ground injection system, optionally, further comprises: the residual acid recovery device is communicated with the first connecting pipeline through the second connecting pipeline, and a second valve body is arranged on the second connecting pipeline; the first valve body is located upstream of the second valve body in the pumping direction of the foaming acid.
The above-mentioned foam acid ground injection system, optionally, further comprises: and the defoaming device is communicated with the residual acid recovery device.
The utility model provides a sour ground injection system of foam of sour ground injection system of foam, the sour ground injection system of foam sets up the subaerial of oil well head, and it includes: the fracturing pump comprises a liquid phase modulation device, a fracturing pump-in device communicated with the outlet end of the liquid phase modulation device, a gas phase device and a foam generating device; the outlet end of the fracturing pump device and the outlet end of the gas phase device are both communicated with the inlet end of the foam generating device, and the foam generating device is used for injecting foam acid into the oil well so as to acidify the plugging in the stratum around the oil well. The foam acid is a foam system which takes acid as a continuous phase and bubbles as a dispersed phase and can selectively enter acid, so that the foam acid has certain acidification capacity and has the fluid property of foam, and is pumped into a plugging part in the stratum around an oil well to react with the stratum and plugs in the stratum under the action of the acid to form more erosion channels so as to relieve pollution and plugging in the stratum around the oil well; furthermore, as the foamed acid has the fluid property of foam and excellent flowback capability, the acid, the stratum and the reactant of the blockage and the residual acid can be quickly and effectively carried for flowback, the blockage in the stratum around the oil well is thoroughly removed, and the damage of the acidification to the stratum can be reduced as much as possible while the pore passage of the stratum is purified and dredged. Therefore, the foam acid ground injection system provided by the embodiment achieves the purpose of reducing damage to the stratum while knowing the blockage caused by the solid phase and the liquid phase of the drilling fluid and the completion fluid in the stratum around the well wall, and solves the problems of pollution and damage to the stratum caused by the blockage when the solid phase and the liquid phase of the drilling fluid and the completion fluid are removed by adopting the conventional liquid acid hydrolysis and enter the stratum around the well wall.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor.
FIG. 1 is a schematic structural diagram of a foamed acid ground injection system according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a ground injection system for foamed acid provided in the second embodiment of the present invention;
FIG. 3 is a schematic structural diagram of another foamed acid surface injection system provided in accordance with an embodiment of the present invention;
FIG. 4 is a schematic flow chart illustrating a method for using the foamed acid ground injection system according to a third embodiment of the present invention;
fig. 5 is another schematic flow chart of a method for using the foamed acid surface injection system according to the third embodiment of the present invention.
The attached drawings indicate the following:
1-an oil well;
2-liquid phase modulation device;
201-acid solution tank;
202-a clean water tank;
3-fracturing pump into device;
4-gas phase means;
5-a foam generating device;
501-a first inlet end;
502-a second inlet end;
503-an outlet end;
6-residual acid recovery unit;
7-a defoaming device;
8-a first connecting line;
9-a first valve body;
10-a second connecting line;
11-a second valve body;
12-branch lines;
13-sleeve valve.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
In the process of oil exploitation, as the drilling fluid and the completion fluid are in contact with the stratum for a long time and in a large area, the solid phase and the liquid phase of the drilling fluid and the completion fluid can enter the stratum around the wall of the oil well, so that a large-range pollution zone is formed, and the stratum around the wall of the oil well is blocked. In order to remove the blockage and pollution of the stratum around the well wall of the oil well caused by the drilling fluid and the completion fluid in the drilling and completion processes, the blockage and pollution of the stratum around the well wall of the oil well in the drilling process can be removed by adopting an acidification technology. However, the pollution and plugging of the formation around the oil well are relieved by acidification with conventional liquid acid, so that the method is not only difficult to adapt to heterogeneous complex oil and gas reservoirs, but also easy to damage the formation and pipelines to a certain extent. Therefore, the utility model provides a sour ground injection system of foam removes jam, pollution that the solid phase and the liquid phase of drilling fluid and completion fluid caused in the stratum around the wall of a well.
Example one
Fig. 1 is a schematic structural diagram of a foamed acid ground injection system according to an embodiment of the present invention.
The foamed acid ground injection system provided by the embodiment can be used in the technical field of oilfield exploitation, and the foamed acid ground injection system provided by the embodiment achieves the purpose of removing the blockage caused by the solid phase and the liquid phase of the drilling fluid and the completion fluid in the stratum around the well wall, and solves the problems of blockage and pollution caused by the solid phase and the liquid phase of the drilling fluid and the completion fluid entering the stratum around the well wall.
As shown in fig. 1, the foam acid surface injection system, which is disposed on the surface of the mouth of an oil well 1, includes: the device comprises a liquid phase modulation device 2, a fracturing pump-in device 3 communicated with an outlet end 503 of the liquid phase modulation device 2, a gas phase device 4 and a foam generating device 5; the outlet end 503 of the fracturing pump-in device 3 and the outlet end 503 of the gas phase device 4 are both communicated with the inlet end of the foam generating device 5, and the foam generating device 5 is used for injecting foam acid into the oil well 1 so as to remove the blockage in the stratum around the oil well 1.
In the embodiment, as shown in fig. 1, the fracturing pump-in device 3 is communicated with the fracturing pump-in device 2, the fracturing pump-in device 3 and the gas phase device 4 are simultaneously pumped into the foam generating device 5 to form the foam acid, the foam acid is injected into the oil well 1, and the foam acid is a foam system which takes acid as a continuous phase and bubbles as a dispersed phase and can selectively enter acid, so that the foam acid has certain acidification capacity and has the fluid property of foam, and the foam acid is pumped into the plugging part in the stratum around the oil well 1 and reacts with the stratum and plugs in the stratum under the action of the acid to form more corrosion channels so as to relieve pollution and plugging in the stratum around the oil well 1 and improve the productivity of the mine.
In the embodiment, it should be noted that, because the foamed acid has the fluid property of foam, excellent flowback capability and carrying capability, the acid, the reactant of the formation and the blockage and the residual acid can be quickly and effectively carried for flowback, the blockage in the formation around the oil well 1 can be thoroughly removed, the formation pore can be purified and dredged, meanwhile, the damage to the formation caused by acidification can be reduced as much as possible, and the compatibility of the foamed acid and the formation fluid is good, the damage to the formation is low, and the formation can be protected from damage while the blockage is removed by acidification. In addition, the foam acid has better corrosion inhibition speed, and the damage to the pipe column is lower than that of the conventional acid solution.
In the embodiment, the foam acid has a shunting characteristic in the stratum, firstly enters the high permeability layer, so that the flow resistance is gradually improved, a Jamin effect is formed under an air resistance superposition effect, the high permeability layer is temporarily blocked, and the acidification effect of the low permeability layer is improved. In this embodiment, the solid phase and the liquid phase of the drilling fluid and the completion fluid enter the stratum around the borehole wall of the oil well 1 to form a large-scale pollution zone, and block the stratum around the borehole wall of the oil well 1, so that the seepage resistance of the fluid in the stratum is increased, and therefore, the permeability of the stratum with serious pollution around the borehole wall of the oil well 1 is lower than that of the surrounding stratum. Therefore, the foamed acid has better acidification effect on the stratum seriously polluted around the well wall of the oil well 1, and can better relieve the pollution and blockage of the stratum around the well wall of the oil well 1.
In the embodiment, the giardiasis effect is that when two phases of liquid-liquid and gas-liquid immiscible flow in rock pores, capillary resistance needs to be overcome when a phase interface moves to a throat narrow opening of a capillary and is about to pass through, and the resistance effect is called the giardiasis effect.
In this embodiment, the specific components and systems of the foaming acid are formed in the prior art, and further description thereof is omitted in this embodiment.
In this embodiment, as shown in fig. 1, the inlet end of the foam generating device 5 includes a first inlet end 501 and a second inlet end 502, wherein the outlet end 503 of the fracturing pump-in device 3 and the outlet end 503 of the gas phase device 4 are respectively communicated with the first inlet end 501 and the second inlet end 502 of the foam generating device 5.
In the embodiment, the foam acid acidification technology is to add a foaming agent and a foam stabilizer into a conventional acid liquid system, mix the foaming agent and the foam stabilizer by a foam generating device 5 to form a foam system which takes acid as a continuous phase and bubbles as a dispersed phase, so that the prepared acidification system has both foam fluid property and acidification capacity, and then pump the foam system into a stratum blocked around an oil well 1 by the foam generating device 5 to carry out acidification so as to remove blockage and pollution.
In this embodiment, the foam generating device 5 may be a foam generator or other device capable of generating foam and suitable for use in foaming acid, that is, in this embodiment, the foam generating device 5 includes but is not limited to a foam generator.
It should be noted that, in order to generate foam with uniform size and stable performance, in this embodiment, a stirring component is further disposed in the foam generating device 5, and the liquid phase and the gas phase in the foam generating device 5 can be sufficiently contacted by the stirring component, so that foam with uniform size and stable performance is generated under the condition that stirring conditions (such as rotation speed and stirring time) are not changed.
Wherein, the stirring subassembly can be spiral stirring subassembly or any other parts that can play the stirring among the prior art, and this stirring subassembly and foam generating device's connected mode can adopt threaded connection, in this embodiment, no longer describes further the structure and the fixed mode of this stirring subassembly.
In the present embodiment, as shown in fig. 1, the liquid phase modulation apparatus 2 includes: the acid liquor tank 201 and the clean water tank 202, and the acid liquor tank 201 and the clean water tank 202 are both communicated with the inlet end of the fracturing pump-in device 3.
In the embodiment, as shown in fig. 1, before the foamed acid is formed, the acid solution and clean water for blending are both stored in the liquid phase modulation device 2, or the acid solution and clean water for blending are blended and stored in the fracturing pump-in device 3, the fracturing pump-in device 3 and the gas phase device 4 are opened, the liquid phase and the gas phase form the foamed acid in the foam generating device 5, the foam generating device 5 pumps the formed foamed acid into the producing zone under the oil well 1, so as to remove the pollution and plugging in the stratum around the oil well 1, and improve the productivity of the mine, thereby having good effect,
wherein, in this embodiment, fracturing pump is into device 3 and is the fracturing pump truck or other pump into device that can pump the liquid phase into foam generating device 5, and this embodiment promptly, fracturing pump is into device 3 and includes but not limited to the fracturing pump truck.
In the present embodiment, as shown in fig. 1, the gas phase device 4 includes a storage device for storing a gas phase or a gas phase generation device for generating a gas phase;
the gas phase stored in the storage device comprises nitrogen, carbon dioxide or air;
the gas phase generating device is a liquid nitrogen pump truck or a liquid nitrogen pump tank.
In this embodiment, the gas phase may be nitrogen, or may also be carbon dioxide or air, that is, in this embodiment, the gas phase is preferably nitrogen. The gas phase generating device is preferably a liquid nitrogen pump truck, liquid nitrogen is pumped into the foam generating device 5 through the liquid nitrogen pump truck, and the liquid nitrogen and the liquid phase form foam acid together.
In this embodiment, as shown in fig. 1, the method further includes: a first connecting pipeline 8, wherein a first end of the first connecting pipeline 8 is communicated with an outlet end 503 of the foam generating device 5, and a second end of the first connecting pipeline 8 extends into the oil well 1;
wherein the first connecting line 8 is provided with at least one first valve body 9.
In the embodiment, the foam generating device 5 pumps foam acid into the polluted part of the surrounding stratum in the oil well 1 through the first connecting pipeline 8, and plugging and pollution in the surrounding stratum of the oil well 1 are removed through acidification. In this embodiment, the circulation condition of the foamed acid in the first connection pipeline 8 can be controlled through the second valve body, so as to control the acidification process of the foamed acid.
In this embodiment, the first connecting pipeline 8 may be a production pipe or other connecting pipelines.
In this embodiment, the first valve body 9 may be a christmas tree valve or a check valve, or may be another valve body capable of controlling the circulation condition of the foamed acid in the first connection pipeline 8, that is, in this embodiment, the first valve body 9 is preferably a christmas tree valve.
Accordingly, the present embodiment provides a foamed acid surface injection system, which is disposed on the surface of the mouth of the oil well 1, and comprises: the device comprises a liquid phase modulation device 2, a fracturing pump-in device 3 communicated with an outlet end 503 of the liquid phase modulation device 2, a gas phase device 4 and a foam generating device 5; the outlet end 503 of the fracturing pump-in device 3 and the outlet end 503 of the gas phase device 4 are both communicated with the inlet end of the foam generating device 5, and the foam generating device 5 is used for injecting foam acid into the oil well 1 so as to acidify the plugging in the stratum around the oil well 1. Because the foamed acid is a foam system which takes acid as a continuous phase and bubbles as a dispersed phase and can selectively enter acid, the foamed acid has certain acidification capacity and has the fluid property of foam, and the foamed acid is pumped into a plugging part in the stratum around the oil well 1 and reacts with the stratum and plugs in the stratum under the action of the acid to form more erosion channels so as to relieve pollution and plugging in the stratum around the oil well 1; furthermore, as the foamed acid has the fluid property of foam and excellent flowback capability, the acid can quickly and effectively carry the reactants of the acidified acid, the stratum and the blockage substances and the residual acid to flow back, and the blockage in the stratum around the oil well 1 is thoroughly removed, so that the stratum pore channel is purified and dredged, and the damage of the acidification to the stratum can be reduced as much as possible. Therefore, the foam acid ground injection system provided by the embodiment achieves the purpose of reducing damage to the stratum while knowing the blockage caused by the solid phase and the liquid phase of the drilling fluid and the completion fluid in the stratum around the well wall, and solves the problems of pollution and damage to the stratum caused by the blockage when the solid phase and the liquid phase of the drilling fluid and the completion fluid are removed by adopting the conventional liquid acid hydrolysis and enter the stratum around the well wall.
Example two
Fig. 2 is a schematic structural diagram of a ground injection system for foamed acid provided by the second embodiment of the present invention, and fig. 3 is a schematic structural diagram of another ground injection system for foamed acid provided by the second embodiment of the present invention.
Further, in addition to the above embodiment, as shown in fig. 2, in order to facilitate recycling of the acidified residual acid, the present embodiment further includes: the residual acid recovery device 6 is communicated with the first connecting pipeline 8 through a second connecting pipeline 10, wherein a second valve body 11 is arranged on the second connecting pipeline 10; the first valve body 9 is located at the upstream of the second valve body 11 along the pumping direction of the foam acid, so that when the residual acid is recovered, the second valve body 11 is opened by closing the first valve body 9, so that the residual acid enters the residual acid recovery device 6 through the second connecting pipeline 10 for recovery.
In the embodiment, as shown in fig. 2, after the foamed acid is removed from the plugging in the formation around the oil well 1 by acidification, the first valve body 9 is closed, the second valve body 11 is opened, so that the residual acid enters the residual acid recovery device 6 through the second connecting pipeline 10, and the residual acid is recovered and reused.
In this embodiment, the residual acid recovery device 6 may be a storage device for storing residual acid, or may be a device for performing a primary recovery process on residual acid based on the storage. In this embodiment, the primary recovery process includes, but is not limited to, one or more stages of filtering processes. When the residual acid recovering device 6 is a device for primarily recovering and treating residual acid on the basis of storage, one-stage or multi-stage filtering devices may be provided in the storage device. In this embodiment, the filtering device may be a filtering net, or may be a filtering membrane or other filtering device, that is, in this embodiment, the filtering device includes but is not limited to a filtering net, and in this embodiment, the structures of the residual acid recovery device 6 and the filtering device are not further limited.
In this embodiment, the second valve body 11 may be a christmas tree valve or a check valve, or may be another valve body capable of controlling the circulation condition of the residual acid in the second connecting pipeline 10, that is, in this embodiment, the first valve body 9 is preferably a christmas tree valve.
In the present embodiment, as shown in fig. 2, a plurality of branch pipes 12 may be disposed at one end of the first connecting pipeline 8 close to the oil well 1, and each branch pipe 12 is provided with a casing valve 13 of a christmas tree, and the flow of the foamed acid or other fluids through the branch pipes 12 may be controlled by controlling the opening or closing of the casing valve 13; specifically, when the foamed acid or other fluid is to be detected or observed, the sleeve valve 13 may be opened to allow the foamed acid or other fluid to flow out through the branch line 12.
In this embodiment, the first connecting pipeline 8, the second connecting pipeline 10, the branch pipeline 12, the first valve body 9, the second valve body 11 and the casing valve 13 together form a christmas tree wellhead device, wherein the first valve body 9, the second valve body 11 and the casing valve 13 can be used as casing valves on the christmas tree wellhead device to control the flow of fluid in the christmas tree wellhead device.
As shown in fig. 3, in order to increase the storage capacity of the residual acid recovery device 6, the present embodiment further includes: with the defoaming device 7 of residual acid recovery unit 6 intercommunication, can carry out the defoaming with the residual acid that stores in residual acid recovery unit 6 through defoaming device 7 and handle, be convenient for follow-up recovery and the transportation of residual acid.
In this embodiment, the defoaming device 7 is located above the residual acid recovery device 6 to spray a defoaming agent into the residual acid recovery device 6, so as to realize defoaming treatment of residual acid.
In this embodiment, the defoaming device 7 may be a defoaming agent storage device provided with a sprinkler head, and when defoaming treatment needs to be performed on the residual acid stored in the residual acid recovery device 6, the defoaming device 7 is turned on, and the defoaming agent is sprayed into the residual acid recovery device 6 through the sprinkler head, so as to perform defoaming treatment on the residual acid.
It should be noted that the defoaming agent in this embodiment can achieve the object of the present invention by using any defoaming agent in the prior art, and therefore, in this embodiment, the defoaming agent is not further limited.
EXAMPLE III
Fig. 4 is a schematic flow chart of a method for using the ground injection system of foamed acid provided by the third embodiment of the present invention, and fig. 5 is another schematic flow chart of a method for using the ground injection system of foamed acid provided by the third embodiment of the present invention.
Further, on the basis of the above embodiments, as shown in fig. 4 and 5, in this embodiment, the present invention provides a method for using the above embodiment of the foam acid ground injection system, where the method includes the following steps:
step 101: opening the fracturing pump-in device 3 and the gas phase device 4, and pumping the liquid phase and the gas phase into the foam generating device 5 to generate foam acid;
step 102: a foamed acid is injected into the well 1 to unblock the formation around the well 1.
In the embodiment, the fracturing pump-in device 3 and the gas-phase device 4 are respectively communicated with the inlet of the foam generating device 5 through a pipeline, and the fracturing pump-in device 3 and the gas-phase device 4 are simultaneously opened, so that the liquid phase and the gas phase are simultaneously pumped into the foam generating device 5, and the liquid phase (such as acid liquid) and the gas phase (such as nitrogen gas) are contacted in the foam generating device 5 to generate foam acid. In the embodiment, the pumping amount and the pumping speed of the liquid phase and the gas phase can be respectively adjusted by the fracturing pumping device 3 and the gas phase device 4 to form a stable foamed acid system.
In practical application, under the condition that the liquid phase and the gas phase are determined, the pumping amount and the pumping speed of the liquid phase and the gas phase can be respectively adjusted by the fracturing pumping device 3 and the gas phase device 4 according to the requirements of the actual oil well 1, so that a stable foamed acid system with a proper proportion is formed. In this example, the composition of the foaming acid is not further described.
In this embodiment, reference may be made to the above embodiment for the principle of releasing the plugging in the formation around the oil well 1 by injecting the foamed acid into the formation around the oil well 1, and further description thereof is omitted in this embodiment.
In this embodiment, before opening the frac pumping apparatus 3 and the gas phase apparatus 4, the method further includes:
step 100: checking whether the pressure-bearing capacity of the ground connecting pipeline is qualified or not;
if the test is qualified, opening the fracturing pump-in device 3 and the gas phase device 3 at the same time, and pumping the liquid phase and the gas phase into the foam generating device 5 to generate foam acid;
if the test is unqualified, the pressure-bearing capacity of the ground connecting pipeline is continuously tested until the test is qualified;
after injecting the foamed acid into the well 1 to unblock the formation around the well 1, the method further comprises:
step 103: the residual acid in the oil well 1 is defoamed and recovered.
In this embodiment, in order to ensure that the ground connection pipeline has a certain pressure-bearing capacity, the pressure-bearing capacity of the ground connection pipeline needs to be checked before the fracturing pump-in device 3 and the gas phase device 4 are opened, and the method for checking whether the pressure-bearing capacity of the ground connection pipeline is qualified is to test the pressure of the connection pipeline, which is to bear a high pressure part on the ground, with 70MPa through clean water, into a qualified connection pipeline, specifically, when the pressure of the connection pipeline to be tested is 70MPa, the pressure is stabilized for 5min, no puncture and no leakage occur, and the pressure drop is less than 0.7MPa, the pressure-bearing capacity of the connection pipeline to be tested is qualified, otherwise, the connection pipeline to be tested is not qualified, and the tightness check is.
In this embodiment, the connecting pipeline of the portion of the ground that needs to bear high pressure includes the connecting pipeline between the fracturing pump device 3 and the gas phase device 4 and the foam generating device 5, and the connecting pipeline at the outlet end of the foam generating device 5.
In the embodiment, in order to recycle the residual acid after acidification, the embodiment pumps the foamed acid into the oil well 1 to relieve the plugging in the formation around the oil well 1, defoams and recycles the residual acid in the oil well 1, so as to recycle the acidified residual acid conveniently.
The utility model provides a sour ground injection system of foam realizes knowing the purpose of removing the jam that solid phase and the liquid phase of drilling fluid and completion liquid caused in the stratum around the wall of a well, has solved the solid phase and the liquid phase of drilling fluid and completion liquid and has got into the problem of jam and pollution that the stratum around the wall of a well produced.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the terms "comprises" and "comprising," and any variations thereof, as used herein, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integral to one another; either directly or indirectly through intervening media, such as through internal communication or through an interaction between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.
Claims (10)
1. A foamed acid surface injection system for placement on the surface of an oil wellhead comprising: the fracturing pump comprises a liquid phase modulation device, a fracturing pump-in device communicated with the outlet end of the liquid phase modulation device, a gas phase device and a foam generating device; the outlet end of the fracturing pump device and the outlet end of the gas phase device are both communicated with the inlet end of the foam generating device, and the foam generating device is used for injecting generated foam acid into the oil well so as to remove plugging in the stratum around the oil well.
2. The foam acid surface injection system of claim 1, wherein the inlet end of the foam generating device comprises a first inlet end and a second inlet end, and wherein the outlet end of the frac pump device and the outlet end of the gas phase device are in communication with the first inlet end and the second inlet end of the foam generating device, respectively.
3. The foam acid surface injection system of claim 1 or 2, wherein the liquid phase modulation device comprises: the acid solution tank and the clear water tank are communicated with the inlet end of the fracturing pump-in device.
4. The foam acid surface injection system of claim 3, wherein the frac pump apparatus is a frac pump truck.
5. The foam acid surface injection system of claim 1, wherein the gas phase means comprises a storage means for storing a gas phase or a gas phase generation means for generating a gas phase.
6. The foam acid ground injection system of claim 5, wherein the stored gas phase within the storage device comprises nitrogen, carbon dioxide, or air.
7. The foam acid ground injection system of claim 5, wherein the gas phase generation device is a liquid nitrogen pump truck or a liquid nitrogen pump tank.
8. The foam acid surface injection system of claim 1, further comprising: a first end of the first connecting pipeline is communicated with the outlet end of the foam generating device, and a second end of the first connecting pipeline extends into the oil well;
wherein, at least one first valve body is arranged on the first connecting pipeline.
9. The foam acid ground injection system of claim 8, further comprising: the residual acid recovery device is communicated with the first connecting pipeline through the second connecting pipeline, and a second valve body is arranged on the second connecting pipeline; the first valve body is located upstream of the second valve body in the pumping direction of the foaming acid.
10. The foam acid ground injection system of claim 9, further comprising: and the defoaming device is communicated with the residual acid recovery device.
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| CN201921669333.8U CN211201884U (en) | 2019-10-08 | 2019-10-08 | Foam acid ground injection system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112523737A (en) * | 2020-10-23 | 2021-03-19 | 西安石油大油气科技有限公司 | Oil well acidification process and device for improving oil and gas well yield |
| CN112627774A (en) * | 2019-10-08 | 2021-04-09 | 中国石油天然气股份有限公司 | Foam acid ground injection system and use method thereof |
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2019
- 2019-10-08 CN CN201921669333.8U patent/CN211201884U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112627774A (en) * | 2019-10-08 | 2021-04-09 | 中国石油天然气股份有限公司 | Foam acid ground injection system and use method thereof |
| CN112523737A (en) * | 2020-10-23 | 2021-03-19 | 西安石油大油气科技有限公司 | Oil well acidification process and device for improving oil and gas well yield |
| CN112523737B (en) * | 2020-10-23 | 2022-09-20 | 西安石油大油气科技有限公司 | Oil well acidification process and device for improving oil and gas well yield |
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