CN111550213A - Pore passage expanding device and method for scaling of ternary composite oil displacement well - Google Patents
Pore passage expanding device and method for scaling of ternary composite oil displacement well Download PDFInfo
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- SNIOPGDIGTZGOP-UHFFFAOYSA-N Nitroglycerin Chemical compound [O-][N+](=O)OCC(O[N+]([O-])=O)CO[N+]([O-])=O SNIOPGDIGTZGOP-UHFFFAOYSA-N 0.000 description 3
- 239000000006 Nitroglycerin Substances 0.000 description 3
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B37/00—Methods or apparatus for cleaning boreholes or wells
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- Environmental & Geological Engineering (AREA)
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Abstract
The invention discloses a pore canal expanding device for scaling of a ternary complex flooding well, which belongs to the technical field of oil extraction engineering and comprises a connecting pipe; the upper end separator, the upper end damper, the igniter, the combustion bomb, the negative pressure device, the lower end damper and the tail end centralizer are sequentially arranged on the connecting pipe from top to bottom, and the tail end centralizer is fixedly connected with the lower end of the connecting pipe; the connecting piece is connected with the main body of the expansion device and used for suspending the main body of the expansion device; the connecting piece is also connected with the igniter and used for starting the igniter; the pilot is used for igniting the combustion bomb. High-temperature and high-pressure impact flow can be released in order during combustion of the combustion bomb, hot melting and high-pressure impact are carried out on scale substances in a seepage pore passage of the ternary complex flooding well, then rapid crushing and stripping are carried out, meanwhile, the negative pressure characteristic of the negative pressure device is utilized, high-low pressure difference is formed between a shaft sleeve and the negative pressure device, convection of air is realized, and the purpose of backwashing is further realized on the scale substances which are crushed and stripped in the seepage pore passage.
Description
Technical Field
The invention relates to the technical field of oil extraction engineering, in particular to a pore canal enlarging device and method for scaling of a ternary complex flooding well.
Background
At present, along with the continuous deep development and the continuous stable production requirement of oil field development, the oil field development mode is correspondingly adjusted. The ASP flooding is a new tertiary oil recovery technology developed in the 80 s of the 20 th century, and the application of the technology improves the oil displacement efficiency and the crude oil recovery rate; the ASP flooding is one of the main development technologies for the continuous and stable production of the oil field. The ternary combination flooding is a ternary combination system prepared by utilizing three substances of a polymer, a surfactant and alkali. The ternary medium polymer has the main functions of improving the viscosity of the system, effectively improving the fluidity ratio of oil and water and effectively improving the swept range of the ternary composite system; the surfactant has the main function of fully reducing the tension of an oil-water interface, so that the wettability of rock in a stratum is enhanced, and the oil displacement efficiency of a system is effectively improved; the main function of the alkali is to perform neutralization reaction with organic acid in crude oil of an oil reservoir.
However, after the alkaline chemical agent is injected into the stratum, under the influence of factors such as the temperature, the pressure, the ion composition and the pH value of an injection system, various reactions including dissolution, mixing and ion exchange with stratum rocks and stratum water occur, and on the basis, the oil-containing mixed scale integrating silica scale, carbonate scale, corrosion scale and the like is formed in the three-component composite flooding well system. Because the ternary complex system can be continued for a long time after being injected into an oil layer, the scaling problem in an oil well can not disappear after the ternary complex system is stopped being injected, and the mixed scale can be gathered at the periphery of a seepage pore channel, so that the section of the seepage pore channel is continuously reduced, and finally the seepage pore channel is blocked. The permeability of the stratum is continuously reduced, and the productivity of the oil-gas well is seriously influenced.
Therefore, the technical staff in the field needs to solve the problem of how to provide a pore canal extending device capable of stripping and breaking mixed scale in a seepage pore canal through high-pressure jet impact and dissolving the mixed scale at high temperature, and the device is suitable for the pore canal extending of the ASP flooding oil well.
Disclosure of Invention
In view of the above, the invention provides a pore canal expanding device for scaling of a ternary complex flooding well, which peels off and breaks mixed scales in a seepage pore canal at high temperature through high-pressure jet impact.
In order to achieve the purpose, the invention adopts the following technical scheme:
in one aspect, the invention provides a pore canal expanding device for scaling of a ternary complex flooding well, which comprises:
an expandable device body including a connecting tube; the upper end separator, the upper end damper, the igniter, the combustion bomb, the negative pressure device, the lower end damper and the tail end centralizer are sequentially arranged on the connecting pipe from top to bottom, and the tail end centralizer is fixedly connected with the lower end of the connecting pipe; and
the connecting piece is connected with the main body of the tunneling device and used for suspending the main body of the tunneling device; the connecting piece is connected with the igniter and used for starting the igniter; the igniter is used for igniting the combustion bomb.
The beneficial effect of adopting above-mentioned technical scheme is: high-temperature and high-pressure impact flow can be released in order during combustion of the combustion bomb, hot melting and high-pressure impact are carried out on scale substances in a seepage pore passage of the ternary complex flooding well, then rapid crushing and stripping are carried out, meanwhile, the negative pressure characteristic of the negative pressure device is utilized, high-low pressure difference is formed between a shaft sleeve and the negative pressure device, convection of air is realized, and the purpose of backwashing is further realized on the scale substances which are crushed and stripped in the seepage pore passage.
Further, the igniter is an ignition bomb, the connecting piece is a cable, and the ignition bomb is electrically connected with the cable.
Further, the igniter is a pressure initiator, the connecting piece is an oil pipe, and the pressure initiator is connected with the oil pipe through the connecting pipe.
Further, the surface of the negative pressure device is provided with a fragile part for crushing when the set temperature and/or pressure is reached.
Furthermore, the fragile part is equipped with a plurality ofly, and is a plurality of fragile part is axle array distribution in the surface of negative pressure ware.
The beneficial effect of adopting above-mentioned technical scheme is: the fragile part of the surface of the negative pressure device is broken under the action of reaching the set temperature and/or pressure, the negative pressure device can quickly absorb the residual detonation energy in the well casing, so that the pressure in the well casing is instantly reduced, instant impact backflow is generated in the seepage pore channel, the seepage pore channel is flushed, the porosity of the seepage pore channel is increased, the permeability and the flow conductivity of the seepage pore channel are improved, and the capacity of the ternary combination flooding oil well is further improved.
On the other hand, the invention also provides a pore canal expanding method aiming at the scale formation of the ternary complex flooding well, the pore canal expanding method adopts the pore canal expanding device, and the pore canal expanding method comprises the following steps:
step 1: evaluating the blocking condition of the ASP flooding oil well, judging the blocking position and setting a target layer;
step 2: setting a combustion bomb according to the evaluation condition;
and step 3: feeding the hole passage expanding device into a target layer;
and 4, step 4: igniting the combustion bomb, and crushing and stripping the scaling substances around the seepage pore passage by using gas released by combustion of the combustion bomb;
and 5: taking the pore passage expanding device out of the ternary composite oil displacement well;
step 6: and (5) checking the hole passage expansion effect, ending the hole passage expansion when the hole passage expansion effect is qualified, and repeating the steps 2-5 if the hole passage expansion effect is unqualified, until the hole passage expansion effect is qualified.
The beneficial effect of adopting above-mentioned technical scheme is: high-temperature and high-pressure gas can be released in order during combustion of the combustion bomb, so that scales in a seepage channel of the ternary complex flooding well can be quickly crushed and stripped, a high-low pressure difference is formed between a shaft sleeve and a negative pressure device by utilizing the negative pressure characteristic of the negative pressure device, the convection of air is realized, the aim of backwashing the crushed and stripped scales in the seepage channel is realized, the porosity of the seepage channel is increased, the permeability and the flow conductivity of the seepage channel are improved, and the capacity of the ternary complex flooding well is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic structural view of a tunnel boring device according to the present invention;
fig. 2 is another schematic structural diagram of the tunnel-extending device provided by the invention.
Wherein: 1 is a connecting pipe; 2 is an upper end separator; an upper end damper 3; 4 is a combustion bomb; 5 is a negative pressure device; 6 is a lower end damper; 7 is a tail end centralizer; 8 is a firing bomb; 9 is a cable; 10 is a pressure initiator; 11 is an oil pipe; 12 is a frangible portion; 13 is a shaft casing; and 14 are seepage channels.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
Referring to the attached drawing 1, the embodiment of the invention discloses a pore canal expanding device for scaling of a ternary complex flooding well, which comprises:
the expanding device comprises an expanding device main body and a connecting pipe, wherein the expanding device main body comprises a connecting pipe 1; the upper end separator 2, the upper end damper 3, the igniter, the combustion bomb 4, the negative pressure device 5, the lower end damper 6 and the tail end centralizer 7 are sequentially arranged on the connecting pipe 1 from top to bottom, and the tail end centralizer 7 is fixedly connected with the lower end of the connecting pipe 1; and
the connecting piece is connected with the main body of the expansion device and used for suspending the main body of the expansion device; the connecting piece is also connected with the igniter and used for starting the igniter; the pilot is used to pilot the combustion bomb 4.
In the embodiment, a biradical propellant, namely a homogeneous mixture of cellulose nitrate and nitroglycerin, is adopted, a shell bonded charge is adopted, high-temperature and high-pressure gas can be released orderly during combustion, the pressure of the gas is greater than the crushing pressure of scaling substances around a seepage pore channel 14 and less than the pressure resistance of a shaft sleeve 13, the combustion duration of the combustion bomb 4 is long, the scaling substances around the seepage pore channel 14 are effectively crushed and stripped, cracks of the seepage pore channel 14 can be extended, and the generated high temperature is favorable for dissolving the scaling substances in the seepage pore channel 14.
Specifically, the igniter is a pilot bomb 8, the connecting piece is a cable 9, and the pilot bomb 8 is electrically connected with the cable 9. In this embodiment, the tunnel-expanding device is lowered to a specified position in the ASP flooding well through a cable 9, and the ignition bomb 8 is ignited through the cable 9, so that the ignition bomb 4 releases high-temperature and high-pressure gas.
Specifically, the surface of the negative pressure device 5 is provided with a plurality of fragile portions 12 for being broken under the action of reaching a set temperature and/or pressure, and the plurality of fragile portions 12 are distributed on the surface of the negative pressure device 5 in an axial array manner.
In this embodiment, the fragile portion 12 is an outer blind hole, the remaining wall thickness of the outer blind hole satisfies the pressure of the well depth in an original state, and when the fragile portion is subjected to the detonation pressure of the combustion bomb 4 in the wellbore casing 13, the wall thickness of the outer blind hole is punctured, and the negative pressure device 5 can rapidly absorb the residual detonation energy in the wellbore casing 13, so that the pressure in the wellbore casing 13 is instantaneously reduced, and the instantaneous impact backflow is generated in the seepage duct 14, thereby completing the backwashing of the seepage duct 14, and further flushing the seepage duct 14.
In other embodiments, the breakable part 12 is a pre-opened through hole, and the breakable part 12 can be broken by the temperature and/or pressure generated by the combustion of the bomb 4 by wrapping the surface of the negative pressure device 5 with plastic and ensuring that the wrapped plastic can meet the pressure at the position of the tunnel boring device in the ternary complex drive well.
Example 2
Referring to the attached figure 2, the embodiment of the invention discloses a pore canal expanding device for scaling of a ternary complex flooding well, which comprises:
the expanding device comprises an expanding device main body and a connecting pipe, wherein the expanding device main body comprises a connecting pipe 1; the upper end separator 2, the upper end damper 3, the igniter, the combustion bomb 4, the negative pressure device 5, the lower end damper 6 and the tail end centralizer 7 are sequentially arranged on the connecting pipe 1 from top to bottom, and the tail end centralizer 7 is fixedly connected with the lower end of the connecting pipe 1; and
the connecting piece is connected with the main body of the expansion device and used for suspending the main body of the expansion device; the connecting piece is also connected with the igniter and used for starting the igniter; the pilot is used to pilot the combustion bomb 4.
In the embodiment, a biradical propellant, namely a homogeneous mixture of cellulose nitrate and nitroglycerin, is adopted, a shell bonded charge is adopted, high-temperature and high-pressure gas can be released orderly during combustion, the pressure of the gas is greater than the crushing pressure of scaling substances around a seepage pore channel 14 and less than the pressure resistance of a shaft sleeve 13, the combustion duration of the combustion bomb 4 is long, the scaling substances around the seepage pore channel 14 are effectively crushed and stripped, cracks of the seepage pore channel 14 can be extended, and the generated high temperature is favorable for dissolving the scaling substances in the seepage pore channel 14.
Specifically, the igniter is a pressure initiator 10, the connecting piece is an oil pipe 11, and the pressure initiator 10 is connected with the oil pipe 11 through a connecting pipe 1. In this embodiment, the tunnel boring device is lowered to a specified position in the three-component composite drive well through the oil pipe 11, and the pressure initiator 10 is activated by applying pressure to the inside of the oil pipe 11, so that the combustion bomb 4 is ignited by the pressure initiator 10 to release high-temperature and high-pressure gas.
Specifically, the surface of the negative pressure device 5 is provided with a plurality of fragile portions 12 for being broken under the action of reaching a set temperature and/or pressure, and the plurality of fragile portions 12 are distributed on the surface of the negative pressure device 5 in an axial array manner.
In this embodiment, the fragile portion 12 is an outer blind hole, the original state of the remaining wall thickness of the outer blind hole satisfies the pressure of the well depth, and when the fragile portion is subjected to the detonation pressure of the combustion bomb 4 in the wellbore casing 13, the wall thickness of the outer blind hole is punctured, and the negative pressure device 5 can rapidly absorb the residual detonation energy in the wellbore casing 13, so that the pressure in the wellbore casing 13 is instantaneously reduced, and the instantaneous impact backflow is generated in the seepage duct 14, thereby completing the back flushing of the seepage duct 14, and further flushing the seepage duct 14.
In other embodiments, the breakable part 12 is a pre-opened through hole, and the breakable part 12 can be broken by the temperature and/or pressure generated by the combustion of the bomb 4 by wrapping the surface of the negative pressure device 5 with plastic and ensuring that the wrapped plastic can meet the pressure at the position of the tunnel boring device in the ternary complex drive well.
Example 3
The invention also discloses a pore canal expanding method aiming at the scale formation of the ternary complex flooding well, which adopts the pore canal expanding device aiming at the scale formation of the ternary complex flooding well in any one of the embodiment 1 and the embodiment 2, and specifically comprises the following steps:
step 1: evaluating the blocking condition of the ASP flooding well, judging the blocking position, setting a target layer, and performing pore canal expansion on the ASP flooding well when the blocking condition reaches the level needing to be expanded;
step 2: setting a combustion bomb according to the evaluation condition, selecting a corresponding dose of space propellant to set the combustion bomb according to the severity of the blockage condition, wherein the detonation range and the volume expansion multiple of the combustion bomb can be calculated by the weight of the space propellant, the combustion bomb adopts a double-base propellant in the embodiment, namely a homogeneous mixture consisting of nitrocellulose and nitroglycerin, shell bonding type charging is adopted, and the detonation range of the combustion bomb can accept errors of +/-3% in the embodiment;
and step 3: the hole passage expanding device is conveyed into a target layer along the inside of a well casing, seepage holes are formed in the periphery of the target layer, the hole passage expanding device is +/-2 m of the target layer, for example, the target layer is underground 300m, and the hole passage expanding device can be located between 298m and 302m of the underground;
and 4, step 4: the igniter ignites the combustion bomb, and the gas released by combustion of the combustion bomb is used for crushing and stripping the scale substances at the periphery of the seepage pore channel, so that the porosity of the seepage pore channel can be increased by crushing and stripping the scale substances;
and 5: taking the pore passage expanding device out of the ternary composite oil displacement well;
step 6: and (3) inspecting the expanding effect of the seepage channel, finishing the expanding of the seepage channel when the seepage channel is qualified, and repeating the step (2-5) if the seepage channel is unqualified, wherein the dosage of the double-base propellant can be properly increased when the combustion bomb is arranged, and the expanding of the seepage channel is continued until the seepage channel is qualified.
In particular, the manner of igniting the bumer bomb in step 4 is by cable ignition or by pressure initiator ignition.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (7)
1. A pore passage expanding device for scaling of a ternary complex flooding well is characterized by comprising:
an expandable device body comprising a connection tube (1); the upper end barrier (2), the upper end damper (3), the igniter, the combustion bomb (4), the negative pressure device (5), the lower end damper (6) and the tail end centralizer (7) are sequentially arranged on the connecting pipe (1) from top to bottom, and the tail end centralizer (7) is fixedly connected with the lower end of the connecting pipe (1); and
the connecting piece is connected with the main body of the tunneling device and used for suspending the main body of the tunneling device; the connecting piece is also connected with the igniter and used for starting the igniter; the pilot is used for igniting the combustion bomb (4).
2. The tunnel reaming device for scale formation of ternary complex flooding wells according to claim 1, characterized in that the igniter is an igniter bomb (8), the connection is a cable (9), and the igniter bomb (8) is electrically connected with the cable (9).
3. The pore canal reaming device for scale formation of ternary complex flooding wells according to claim 1, characterized in that the igniter is a pressure initiator (10), the connecting piece is an oil pipe (11), and the pressure initiator (10) is connected with the oil pipe (11) through the connecting pipe (1).
4. The pore canal reaming device for ternary complex flooding well fouling according to claim 1, characterized in that the surface of the negative pressure device (5) is provided with a fragile part (12) for breaking under the effect of reaching a set temperature and/or pressure.
5. The pore canal expanding device for the scale formation of the ternary complex flooding well is characterized in that the number of the fragile parts (12) is multiple, and the fragile parts (12) are distributed on the surface of the negative pressure device (5) in an axial array manner.
6. A pore canal reaming method aiming at scaling of a ternary complex flooding well, which adopts the pore canal reaming device of any one of claims 1 to 5, and is characterized by comprising the following steps:
step 1: evaluating the blocking condition of the ASP flooding oil well, judging the blocking position and setting a target layer;
step 2: setting a combustion bomb according to the evaluation condition;
and step 3: feeding the hole passage expanding device into a target layer along the inside of a shaft casing;
and 4, step 4: the igniter ignites the combustion bomb, and the gas released by combustion of the combustion bomb breaks and peels off the scale substances around the seepage pore channel;
and 5: taking the pore passage expanding device out of the ternary composite oil displacement well;
step 6: and (5) inspecting the expanding effect of the seepage channel, finishing the expanding of the seepage channel when the seepage channel is qualified, and repeating the steps 2-5 if the seepage channel is unqualified until the seepage channel is qualified.
7. The method of claim 6, wherein the method for igniting the bum bomb in the step 4 is to ignite the bum bomb through a cable or a pressure initiator.
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| CN114673472A (en) * | 2022-03-28 | 2022-06-28 | 东北石油大学 | Mechanical device for stripping multiphase gelled sludge and operation optimization design method |
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| CN111550213B (en) | 2022-05-17 |
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