CN112302918B - Starting method of high-temperature electric submersible pump after well workover of thickened oil SAGD well - Google Patents
Starting method of high-temperature electric submersible pump after well workover of thickened oil SAGD well Download PDFInfo
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- CN112302918B CN112302918B CN201910713831.6A CN201910713831A CN112302918B CN 112302918 B CN112302918 B CN 112302918B CN 201910713831 A CN201910713831 A CN 201910713831A CN 112302918 B CN112302918 B CN 112302918B
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- 238000000034 method Methods 0.000 title claims abstract description 67
- 238000010796 Steam-assisted gravity drainage Methods 0.000 title claims abstract description 31
- 238000004519 manufacturing process Methods 0.000 claims abstract description 85
- 238000005086 pumping Methods 0.000 claims description 58
- 238000010793 Steam injection (oil industry) Methods 0.000 claims description 23
- 238000002347 injection Methods 0.000 claims description 17
- 239000007924 injection Substances 0.000 claims description 17
- 238000012360 testing method Methods 0.000 claims description 7
- 239000003129 oil well Substances 0.000 claims description 5
- 229920006395 saturated elastomer Polymers 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 239000003921 oil Substances 0.000 abstract description 50
- 239000000295 fuel oil Substances 0.000 abstract description 7
- 239000007788 liquid Substances 0.000 description 7
- 238000009825 accumulation Methods 0.000 description 5
- 230000008439 repair process Effects 0.000 description 5
- 239000010865 sewage Substances 0.000 description 5
- 230000005465 channeling Effects 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000009933 burial Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/02—Stopping, starting, unloading or idling control
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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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Abstract
The invention provides a starting method of a high-temperature electric submersible pump after well workover of a thickened oil SAGD well, which comprises the following steps: step S01: pouring a first heat medium into a well bore of a production well, wherein the temperature of the first heat medium is a first temperature; step S03: starting the pump in a trial mode, finishing starting if the high-temperature electric submersible pump is started, and executing the step S04 if the high-temperature electric submersible pump is not started; step S04: pouring a second heat medium into a well bore of the production well, wherein the temperature of the second heat medium is a second temperature, and the second temperature is higher than the first temperature; step S06: and (5) starting the pump by trial, and finishing the starting if the high-temperature electric submersible pump is started. By applying the technical scheme of the invention, the problem that the high-temperature electric submersible pump is easily damaged by the starting method of the high-temperature electric submersible pump after the heavy oil SAGD well is repaired in the prior art can be effectively solved.
Description
Technical Field
The invention relates to the field of oil exploitation, in particular to a starting method of a high-temperature electric submersible pump after well workover of a thickened oil SAGD well.
Background
The super heavy oil reservoir in the Xinjiang oil field has the characteristics of shallow burial, thin oil layer and high viscosity, and is mainly mined by adopting an SAGD (steam assisted gravity drainage) process. Two horizontal wells are vertically arranged at the bottom of the oil reservoir, steam is injected into the upper horizontal well, and the lower horizontal well produces oil.
The oil reservoir conditions of foreign Canada and Liaohe in China are good, the SAGD operation pressure is low, the Sinkiang oil reservoir condition is poor, and the problems of thin oil layer, multiple interlayers, poor physical properties of the reservoir, low permeability and the like exist, so that the SAGD can achieve the development effect only by adopting high-pressure operation. But high pressure operation will cause the SAGD steam chamber to be high pressure and high temperature. Meanwhile, the SAGD production well of the shallow oil reservoir is shallow in depth, so that well killing is difficult and the well repairing period is long.
Aiming at the problem of difficult well killing, the SAGD high-temperature electric submersible pump well is solved by adopting a mode of discharging liquid first and killing the well before well killing, but after well killing and well killing are carried out smoothly, the problems of SAGD steam cavity reduction, underground temperature reduction, super-thick oil viscosity increase, mobility deterioration and the like can occur, the high-viscosity thick oil is blocked at the heel of the horizontal section of the SAGD production well, well liquid of the whole horizontal section is prevented from entering the straight inclined well section, and the SAGD high-temperature electric submersible pump is difficult to start or cannot be started. If superheated steam is directly injected into the steam injection well according to the conventional steam injection amount, steam channeling is easily formed when the steam injection well is communicated with the production well, the temperature of a pump is overhigh and exceeds the temperature resistance limit of the high-temperature electric submersible pump, the high-temperature electric submersible pump is damaged, and normal production is influenced.
Disclosure of Invention
The invention mainly aims to provide a starting method of a high-temperature electric submersible pump after well workover of a thickened oil SAGD well, and aims to solve the problem that the high-temperature electric submersible pump is easily damaged by the starting method of the high-temperature electric submersible pump after well workover of the thickened oil SAGD well in the prior art.
In order to achieve the aim, the invention provides a starting method of a high-temperature electric submersible pump after well workover of a thickened oil SAGD well, which comprises the following steps: step S01: pouring a first heat medium into a well bore of a production well, wherein the temperature of the first heat medium is a first temperature; step S03: starting the pump in a trial mode, finishing starting if the high-temperature electric submersible pump is started, and executing the step S04 if the high-temperature electric submersible pump is not started; step S04: pouring a second heat medium into a well bore of the production well, wherein the temperature of the second heat medium is a second temperature, and the second temperature is higher than the first temperature; step S06: and (5) starting the pump by trial, and finishing the starting if the high-temperature electric submersible pump is started.
Further, between step S01 and step S03, the startup method further includes step S02, and step S02 includes: and measuring the pumping temperature of the production well, executing the step S01 if the pumping temperature is less than a first preset value, and executing the step S03 if the pumping temperature is greater than or equal to the first preset value.
Further, between step S04 and step S06, the startup method further includes step S05, and step S05 includes: and measuring the pumping temperature of the production well, executing the step S04 if the pumping temperature is less than a second preset value, and executing the step S06 if the pumping temperature is greater than or equal to the second preset value.
Further, in step S06, if the high-temperature electric submersible pump is not started, step S07 is executed, step S07: pouring a first preset amount of a third heat medium into the steam injection well, wherein the temperature of the third heat medium is a third temperature, and the third temperature is higher than the second temperature; after step S07, the startup method further includes: step S09: and (5) starting the pump by trial, and finishing the starting if the high-temperature electric submersible pump is started.
Further, between step S07 and step S09, the startup method further includes step S08, and step S08 includes: and measuring the pumping temperature of the production well, executing the step S07 if the pumping temperature is less than a third preset value, and executing the step S09 if the pumping temperature is greater than or equal to the third preset value.
Further, in step S09, if the high-temperature electric submersible pump is not started, step S10 is performed, step S10: pouring a second predetermined amount of a third thermal medium into the steam injection well; after step S10, the startup method further includes: step S12: and (5) starting the pump by trial, and finishing the starting if the high-temperature electric submersible pump is started.
Further, between step S10 and step S12, the startup method further includes step S11, and step S11 includes: and measuring the pumping temperature of the production well, executing the step S10 if the pumping temperature is less than a fourth preset value, and executing the step S12 if the pumping temperature is greater than or equal to the fourth preset value.
Further, in step S12, if the high-temperature electric submersible pump is not started, step S13 is executed, step S13: pouring a third predetermined amount of a third thermal medium into the steam injection well; after step S13, the startup method further includes: step S15: and (4) starting the pump in a trial mode, finishing the starting if the high-temperature electric submersible pump is started, and executing the step S13 if the high-temperature electric submersible pump is not started.
Further, between step S13 and step S15, the startup method further includes step S14, and step S14 includes: and measuring the pumping temperature of the production well, executing the step S13 if the pumping temperature is less than a fifth preset value, and executing the step S15 if the pumping temperature is greater than or equal to the fifth preset value.
Further, before step S01, the starting method further includes: collecting oil well data and determining influence factors.
Further, after the high-temperature submersible pump is started, the starting method further comprises the following steps: step S16: and adjusting injection and production parameters to keep the temperature of a pump hanger of the production well within a preset range.
Further, the injection-production parameters include: the injection quantity of the injection medium, the running frequency of the high-temperature electric submersible pump, the size of a wellhead choke of the production well and the temperature resistance of the high-temperature electric submersible pump.
Further, the third heat medium includes superheated steam.
Further, the first thermal medium comprises water, and/or the second thermal medium comprises saturated steam.
By applying the technical scheme of the invention, the first heat medium is injected into the production well, the pump is started in a test mode, if the high-temperature electric submersible pump is not started, the second heat medium with the temperature higher than that of the first heat medium is injected into the production well, and after the second heat medium is injected, the pump is started in a test mode. The starting method ensures that steam channeling is not easily formed when the steam injection well is communicated with the production well, the temperature of the pump hanger of the production well is gradually increased, and the phenomena that the temperature of the pump hanger is suddenly increased and exceeds the temperature resistance limit of the high-temperature electric submersible pump due to the fact that the superheated medium is directly injected are avoided. The high-temperature electric submersible pump is not easy to damage, and the influence on normal production is reduced.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 shows a flow chart of an embodiment of a method for starting a high temperature electric submersible pump after workover of a heavy oil SAGD well according to the present invention.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
As shown in fig. 1, the starting method of the high-temperature electric submersible pump after the heavy oil SAGD well is repaired according to the embodiment includes: step S01: pouring a first heat medium into a well bore of a production well, wherein the temperature of the first heat medium is a first temperature; step S03: starting the pump in a trial mode, finishing starting if the high-temperature electric submersible pump is started, and executing the step S04 if the high-temperature electric submersible pump is not started; step S04: pouring a second heat medium into a well bore of the production well, wherein the temperature of the second heat medium is a second temperature, and the second temperature is higher than the first temperature; step S06: and (5) starting the pump by trial, and finishing the starting if the high-temperature electric submersible pump is started.
By applying the technical scheme of the invention, the first heat medium is injected into the production well, the pump is started in a test mode, if the high-temperature electric submersible pump is not started, the second heat medium with the temperature higher than that of the first heat medium is injected into the production well, and after the second heat medium is injected, the pump is started in a test mode. The starting method can gradually melt the blocking thick oil at the horizontal section, ensure the sufficient liquid supply of the high-temperature electric submersible pump and realize the safe starting, flexible starting and stable operation of the SAGD high-temperature electric submersible pump. In addition, because the temperature of the injected heat medium is gradually increased, steam channeling is not easy to form when the steam injection well is communicated with the production well, the pump hanging temperature of the production well is gradually increased, and the phenomenon that the pump hanging temperature is suddenly increased and exceeds the temperature resistance limit of the high-temperature electric submersible pump due to the fact that the superheated medium is directly injected is avoided. The high-temperature electric submersible pump is not easy to damage, and the influence on normal production is reduced.
For a production well with a low thick oil accumulation at the horizontal section, the temperature of the injected heat medium required to melt the thick oil clogged in the horizontal section does not have to be too high. If the high-temperature heat medium is directly introduced, the blocked thick oil can be melted, but the problems of steam leakage, easy damage of the high-temperature electric submersible pump and the like can be caused. In the present embodiment, as shown in fig. 1, between step S01 and step S03, the startup method further includes step S02, and step S02 includes: and measuring the pumping temperature of the production well, executing the step S01 if the pumping temperature is less than a first preset value, and executing the step S03 if the pumping temperature is greater than or equal to the first preset value. The first thermal medium with lower temperature can be introduced firstly in the steps, and if the amount of the blocked thick oil in the horizontal section is smaller, the blocked thick oil can be completely melted after the pump temperature reaches a first lower preset value, so that the high-temperature electric submersible pump can be normally started. Meanwhile, the first preset value is low, so that the temperature resistance limit of the high-temperature electric submersible pump cannot be exceeded, and the service life of the high-temperature electric submersible pump is guaranteed. Preferably, in the present embodiment, the first heat medium is hot water. Further preferably, in this embodiment, the first heat medium is hot sewage, and the cost of oil recovery can be effectively reduced by melting the blocked thick oil with the sewage. Further preferably, the first predetermined value is 80 ℃.
For a production well with a moderate amount of thick oil accumulation at the horizontal section, if it is desired to melt the clogged thick oil in the horizontal section, it may not be possible to completely melt the clogged thick oil by injecting only the first heat medium having a relatively low temperature. In this case, it is necessary to inject the second thermal medium having a higher temperature than the first thermal medium. Specifically, in the present embodiment, as shown in fig. 1, between step S04 and step S06, the startup method further includes step S05, and step S05 includes: and measuring the pumping temperature of the production well, executing the step S04 if the pumping temperature is less than a second preset value, and executing the step S06 if the pumping temperature is greater than or equal to the second preset value. After the first heat medium is introduced and the pump is started in a test mode, if the high-temperature electric submersible pump is not started, the second heat medium with the temperature higher than that of the first heat medium can be injected, and if the amount of the thick oil blocked in the horizontal section is medium, the blocked thick oil can be completely melted after the temperature of the pump is increased to a second preset value, so that the high-temperature electric submersible pump can be normally started. Meanwhile, the pump hanging temperature of the production well is gradually increased, so that the pump hanging temperature of the production well is convenient to control, the temperature resistance limit of the high-temperature electric submersible pump is avoided being exceeded, and the service life of the high-temperature electric submersible pump is ensured. Preferably, in the present embodiment, the second heat medium is saturated steam (preferably, wet saturated steam). Further preferably, the second predetermined value is 100 ℃.
For a production well having a large accumulation of thick oil at the horizontal section, if it is desired to melt the thick oil clogged in the horizontal section, neither the first heat medium nor the second heat medium having a lower injection temperature may completely melt the clogged thick oil. At this time, a third thermal medium having a higher temperature than the second thermal medium needs to be injected. Specifically, as shown in fig. 1, in the present embodiment, in step S06, if the high-temperature electric submersible pump is not started, step S07 is executed, step S07: pouring a first preset amount of a third heat medium into the steam injection well, wherein the temperature of the third heat medium is a third temperature, and the third temperature is higher than the second temperature; after step S07, the startup method further includes: step S09: and (5) starting the pump by trial, and finishing the starting if the high-temperature electric submersible pump is started. In the starting method, the second heat medium is firstly introduced and the pump is started, if the high-temperature electric submersible pump is not started, a third heat medium with the temperature higher than that of the second heat medium can be injected, wherein the third heat medium is injected in a first preset amount. And (4) starting the pump after injecting the third heat medium, and finishing the starting if the high-temperature electric submersible pump is started. For a production well with a large thick oil accumulation amount at a horizontal section, a small amount of third heat medium is introduced to start the high-temperature electric submersible pump, so that the use amount of the third heat medium is reduced, and the production cost is reduced.
As shown in fig. 1, in the present embodiment, between step S07 and step S09, the starting method further includes step S08, and step S08 includes: and measuring the pumping temperature of the production well, executing the step S07 if the pumping temperature is less than a third preset value, and executing the step S09 if the pumping temperature is greater than or equal to the third preset value. If the amount of the blocked thick oil in the horizontal section is large, the blocked thick oil can be completely melted after the temperature of the pump hanger is increased to a third preset value, so that the high-temperature electric submersible pump can be normally started. Meanwhile, the pump hanging temperature of the production well is gradually increased, so that the pump hanging temperature of the production well is convenient to control, the temperature resistance limit of the high-temperature electric submersible pump is avoided being exceeded, and the service life of the high-temperature electric submersible pump is ensured. Preferably, in the present embodiment, the third heat medium is superheated steam. Further preferably, the third predetermined value is 120 ℃.
For a production well that accumulates a large amount of thick oil at the horizontal section, if it is desired to melt the clogged thick oil in the horizontal section, injecting a small amount of the third heat medium may not completely melt the clogged thick oil. At this time, the injection of the third thermal medium having a higher temperature is continued. Specifically, as shown in fig. 1, in the present embodiment, in step S09, if the high-temperature electric submersible pump is not started, step S10 is executed, step S10: pouring a second predetermined amount of a third thermal medium into the steam injection well; after step S10, the startup method further includes: step S12: and (5) starting the pump by trial, and finishing the starting if the high-temperature electric submersible pump is started. In the starting method, the first predetermined amount of the third heat medium is firstly introduced and the pump is started, and if the high-temperature electric submersible pump is not started, the second predetermined amount of the third heat medium can be continuously introduced. And (4) starting the pump after injecting the third heat medium, and finishing the starting if the high-temperature electric submersible pump is started. For a production well with a large amount of thick oil accumulated in the horizontal section, the high-temperature electric submersible pump can be started by introducing a medium amount of third heat medium, so that the use amount of the third heat medium is reduced, and the production cost is reduced.
As shown in fig. 1, in the present embodiment, between step S10 and step S12, the startup method further includes step S11, and step S11 includes: and measuring the pumping temperature of the production well, executing the step S10 if the pumping temperature is less than a fourth preset value, and executing the step S12 if the pumping temperature is greater than or equal to the fourth preset value. If a large amount of thick oil is blocked in the horizontal section, the blocked thick oil can be completely melted after the temperature of the pump is increased to a fourth preset value, so that the high-temperature electric submersible pump can be normally started. Meanwhile, the pump hanging temperature of the production well is gradually increased, so that the pump hanging temperature of the production well is convenient to control, the temperature resistance limit of the high-temperature electric submersible pump is avoided being exceeded, and the service life of the high-temperature electric submersible pump is ensured. Preferably, the fourth predetermined value is 150 ℃.
For a production well in which the thick oil accumulation amount at the horizontal section is extremely large, if it is desired to melt the thick oil clogged in the horizontal section, the injection of the medium amount of the third heat medium may not completely melt the clogged thick oil. At this time, it is necessary to continue to inject the third heat medium by a third predetermined amount (the conventional steam injection amount in the background art). Specifically, as shown in fig. 1, in the present embodiment, in step S12, if the high-temperature electric submersible pump is not started, step S13 is executed, step S13: pouring a third predetermined amount of a third thermal medium into the steam injection well; after step S13, the startup method further includes: step S15: and (4) starting the pump in a trial mode, finishing the starting if the high-temperature electric submersible pump is started, and executing the step S13 if the high-temperature electric submersible pump is not started. In the starting method, the third heat medium with the second preset amount is firstly introduced, the pump is started, and if the high-temperature electric submersible pump is not started, the third heat medium with the third preset amount can be continuously introduced. Upon attempting to start the pump after injecting the third thermal medium, the high temperature electric submersible pump can typically be started. And in case the high-temperature electric submersible pump is not started, continuously pouring a third preset amount of third heat medium into the steam injection well until the pump is started.
As shown in fig. 1, in the present embodiment, between step S13 and step S15, the startup method further includes step S14, and step S14 includes: and measuring the pumping temperature of the production well, executing the step S13 if the pumping temperature is less than a fifth preset value, and executing the step S15 if the pumping temperature is greater than or equal to the fifth preset value. If the amount of the blocked thick oil in the horizontal section is extremely large, the blocked thick oil can be completely melted after the temperature of the pump hanger is increased to a fifth preset value, so that the high-temperature electric submersible pump can be normally started. Meanwhile, the pump hanging temperature of the production well is gradually increased, so that the pump hanging temperature of the production well is convenient to control, the temperature resistance limit of the high-temperature electric submersible pump is avoided being exceeded, and the service life of the high-temperature electric submersible pump is ensured. Preferably, the fifth predetermined value is 180 ℃.
In the embodiment, the starting method gradually adopts the way that hot sewage, wet steam and superheated steam are introduced into the steam injection well to improve the temperature of the bottom of the SAGD well after repair, gradually melts the thick oil blocked by the horizontal section, ensures the sufficient liquid supply of the high-temperature electric submersible pump, and realizes the safe starting, the flexible starting and the stable operation of the SAGD high-temperature electric submersible pump.
As shown in fig. 1, in this embodiment, after the start-up of the high-temperature submersible pump is completed, the start-up method further includes: step S16: and adjusting injection and production parameters to keep the temperature of a pump hanger of the production well within a preset range. When the temperature of the pump hanger of the production well is stabilized within a preset range, normal production can be started. The starting method can ensure the service life of the high-temperature electric submersible pump.
In this embodiment, the injection and production parameters include: the injection quantity of the injection medium, the running frequency of the high-temperature electric submersible pump, the size of a wellhead choke of the production well and the temperature resistance of the high-temperature electric submersible pump. Specifically, according to the principle that the pumping temperature of the production well does not exceed the temperature resistance limit of the high-temperature electric submersible pump, if the pumping temperature of the production well is far lower than the temperature resistance lower limit of the high-temperature electric submersible pump, the injection amount of the injection medium is increased; and if the pumping temperature of the production well approaches or exceeds the upper temperature-resistant limit of the high-temperature electric submersible pump, reducing the injection amount of the injection medium. In addition, the pumping temperature of the production well can be increased or decreased by increasing or decreasing the operating frequency of the high-temperature electric submersible pump. Or the temperature resistance temperature of the high-temperature electric submersible pump can be changed, so that the pumping temperature of the production well is kept between the upper temperature resistance limit and the lower temperature resistance limit of the high-temperature electric submersible pump.
In this embodiment, before step S01, the starting method further includes: collecting oil well data and determining influence factors. The above structure can facilitate determination of what kind of heat medium is injected into the oil well, the magnitude of the first to fifth predetermined values, and the like.
The method for starting the SAGD high-temperature electric submersible pump after repair in the Xinjiang Fengcheng is described in detail as an example.
In the embodiment, the buried depth of a shallow and thin viscous super heavy oil reservoir in Xinjiang Fengcheng is less than or equal to 500m, the thickness of the oil reservoir is 10-20 m, SAGD double horizontal wells are adopted for development, steam is injected into an upper horizontal well, oil is extracted from a lower horizontal well, and a high-temperature electric submersible pump system is adopted for lifting in an SAGD production well. The specific starting method after repair can refer to the following steps:
step 1: collecting oil well data: the pumping temperature of the production well is 51 ℃, the temperature of the high-temperature electric submersible pump is 218 ℃, and the steam injection amount of the steam injection well is 90 t/d;
step 2: pouring hot sewage of 90 ℃ for 20t into a well bore of the production well;
and step 3: observing the pumping temperature of the production well, wherein the pumping temperature is 81 ℃;
and 4, step 4: and starting the high-temperature electric submersible pump at a discharge capacity of 120t/d, observing a sampling port of the wellhead every 10 minutes after starting for 4 hours, observing no liquid volume for the third time, and stopping the machine.
And 5: injecting wet steam with the temperature of 120 ℃ for 20t into a production well shaft;
step 6: observing the pumping temperature of the production well, wherein the pumping temperature is 102 ℃;
and 7: starting the high-temperature electric submersible pump, discharging at 120t/d, observing a wellhead sampling port every 10 minutes after starting for 4 hours, and continuously observing the liquid amount for three times, which indicates that the high-temperature electric submersible pump is successfully started;
and 8: adjusting injection and production parameters and normally producing.
In the step 8, specifically, in the starting process, the pumping temperature of the production well is gradually increased from 102 ℃ to 196 ℃, and the steam injection amount of the steam injection well is increased from 90t/d to 117 t/d. In order to enable normal production, the pumping temperature of the production well needs to be reduced, and the steam injection amount of the steam injection well is reduced to 60t/d in the embodiment. The starting method enables the pumping temperature of the production well to be reduced to 191 ℃, so that the production of the high-temperature electric submersible pump of the SAGD production well tends to be normal.
From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects:
the invention provides a starting method for a SAGD high-temperature electric submersible pump of a shallow-thin viscous ultra-heavy oil reservoir after repair, which adopts a method of gradually injecting hot sewage, wet steam and superheated steam to increase the bottom temperature of an SAGD well after repair, gradually melts a horizontal section to block heavy oil, ensures sufficient liquid supply of the high-temperature electric submersible pump, and realizes safe start, flexible start and stable operation of the SAGD high-temperature electric submersible pump.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (14)
1. A starting method of a high-temperature electric submersible pump after well workover of a thickened oil SAGD well is characterized by comprising the following steps:
step S01: pouring a first thermal medium into a well bore of a production well, wherein the temperature of the first thermal medium is a first temperature;
step S03: starting the pump in a test mode, wherein if the high-temperature electric submersible pump is started, the starting is finished, and if the high-temperature electric submersible pump is not started, the step S04 is executed;
the step S04: pouring a second thermal medium into a wellbore of a production well, the second thermal medium having a second temperature, the second temperature being higher than the first temperature;
step S06: and (4) starting the pump in a trial mode, and finishing the starting if the high-temperature electric submersible pump is started.
2. The starting method according to claim 1, wherein between the step S01 and the step S03, the starting method further comprises a step S02,
the step S02 includes: measuring a pumping temperature of the production well, performing the step S01 if the pumping temperature is less than a first predetermined value, and performing the step S03 if the pumping temperature is greater than or equal to the first predetermined value.
3. The starting method according to claim 1, wherein between the step S04 and the step S06, the starting method further comprises a step S05,
the step S05 includes: measuring a pumping temperature of the production well, performing the step S04 if the pumping temperature is less than a second predetermined value, and performing the step S06 if the pumping temperature is greater than or equal to the second predetermined value.
4. The starting method according to claim 1, wherein in the step S06, if the high-temperature electric submersible pump is not started, the step S07 is executed,
the step S07: pouring a first predetermined amount of a third thermal medium into the steam injection well, wherein the temperature of the third thermal medium is a third temperature, and the third temperature is higher than the second temperature; after the step S07, the startup method further includes:
step S09: and (4) starting the pump by trial, and finishing the starting if the high-temperature electric submersible pump is started.
5. The starting method according to claim 4, wherein between the step S07 and the step S09, the starting method further comprises a step S08,
the step S08 includes: measuring a pumping temperature of the production well, performing the step S07 if the pumping temperature is less than a third predetermined value, and performing the step S09 if the pumping temperature is greater than or equal to the third predetermined value.
6. The starting method according to claim 4, wherein in the step S09, if the high-temperature electric submersible pump is not started, the step S10 is executed,
the step S10: pouring a second predetermined amount of the third thermal medium into the steam injection well; after the step S10, the startup method further includes:
step S12: and (4) starting the pump by trial, and finishing the starting if the high-temperature electric submersible pump is started.
7. The starting method according to claim 6, wherein between the step S10 and the step S12, the starting method further comprises a step S11,
the step S11 includes: measuring a pumping temperature of the production well, performing the step S10 if the pumping temperature is less than a fourth predetermined value, and performing the step S12 if the pumping temperature is greater than or equal to the fourth predetermined value.
8. The starting method according to claim 6, wherein in the step S12, if the high-temperature electrical submersible pump is not started, a step S13 is performed,
the step S13: pouring a third predetermined amount of the third thermal medium into the steam injection well; after the step S13, the startup method further includes:
step S15: and (4) starting the pump in a test mode, completing the starting if the high-temperature electric submersible pump is started, and executing the step S13 if the high-temperature electric submersible pump is not started.
9. The starting method according to claim 8, wherein between the step S13 and the step S15, the starting method further includes a step S14,
the step S14 includes: measuring the pumping temperature of the production well, executing the step S13 if the pumping temperature is less than a fifth predetermined value, and executing the step S15 if the pumping temperature is greater than or equal to the fifth predetermined value.
10. The starting method according to any one of claims 1 to 9, characterized in that, before the step S01, the starting method further comprises:
collecting oil well data and determining influence factors.
11. The startup method according to any one of claims 1 to 9, further comprising, after completion of startup of the high-temperature electric submersible pump:
step S16: and adjusting injection-production parameters to keep the temperature of a pump hanger of the production well within a preset range.
12. The startup method of claim 11, wherein the voidage replacement parameters include: the injection quantity of the injection medium, the running frequency of the high-temperature electric submersible pump, the size of a wellhead choke of the production well and the temperature resistance of the high-temperature electric submersible pump.
13. A starting method according to claim 4, characterized in that the third heat medium comprises superheated steam.
14. A starting method according to claim 1, characterized in that the first heat medium comprises water and/or the second heat medium comprises saturated steam.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN203594586U (en) * | 2013-09-13 | 2014-05-14 | 中国石油天然气股份有限公司 | Protection device for SAGD (Steam Assisted Gravity Drainage) high-temperature electric submersible pump motor |
| CN108868719A (en) * | 2018-07-09 | 2018-11-23 | 中国石油天然气股份有限公司 | A method of the extraction tapered region SAGD crude oil |
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| US10221856B2 (en) * | 2015-08-18 | 2019-03-05 | Bj Services, Llc | Pump system and method of starting pump |
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| CN203594586U (en) * | 2013-09-13 | 2014-05-14 | 中国石油天然气股份有限公司 | Protection device for SAGD (Steam Assisted Gravity Drainage) high-temperature electric submersible pump motor |
| CN108868719A (en) * | 2018-07-09 | 2018-11-23 | 中国石油天然气股份有限公司 | A method of the extraction tapered region SAGD crude oil |
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