CN112302596B - Injection-production control method for SAGD high-temperature electric submersible pump well group - Google Patents
Injection-production control method for SAGD high-temperature electric submersible pump well group Download PDFInfo
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- CN112302596B CN112302596B CN201910713847.7A CN201910713847A CN112302596B CN 112302596 B CN112302596 B CN 112302596B CN 201910713847 A CN201910713847 A CN 201910713847A CN 112302596 B CN112302596 B CN 112302596B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/24—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
- E21B43/2406—Steam assisted gravity drainage [SAGD]
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/12—Methods or apparatus for controlling the flow of the obtained fluid to or in wells
Abstract
The invention provides an injection-production regulation and control method of an SAGD high-temperature electric submersible pump well group, which comprises the following steps: step S10: determining the regulation factors and regulation indexes of the SAGD high-temperature electric submersible pump well group; step S20: determining a factor regulation limit of a regulation factor of the SAGD high-temperature electric submersible pump well group and an index regulation limit of a regulation index; step S30: regulating and controlling the regulating and controlling factors according to the factor regulating and controlling limit so that the regulating and controlling index is within the index regulating and controlling limit. According to the technical scheme of the invention, the problem that the performance of the high-efficiency area of the high-temperature electric submersible pump of the SAGD high-temperature electric submersible pump well group in the prior art is difficult to exert can be effectively solved.
Description
Technical Field
The invention relates to the field of oil exploitation, in particular to an injection-production regulation and control method of an SAGD high-temperature electric submersible pump well group.
Background
The shallow viscous super heavy oil reservoir in the Xinjiang oil field 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. The lifting mode mainly adopts a sucker-rod pump, but part of SAGD well trajectory difference adopts a high-temperature electric submersible pump to lift.
The reservoir of the Xinjiang super heavy oil reservoir is heterogeneous, the oil layer is thin, and the number of interlayers is large, and the high-pressure SAGD operation is adopted, so that the SAGD well is high in temperature and low in yield. And the SAGD high-temperature electric submersible pump has the limitations of high temperature limitation, low displacement limitation and the like. Once a certain factor in the SAGD high-temperature electric submersible pump well group exceeds the limit, the high-temperature electric submersible pump high-efficiency zone performance is difficult to exert.
Disclosure of Invention
The invention mainly aims to provide an injection-production regulation and control method for an SAGD high-temperature electric submersible pump well group, and aims to solve the problem that the performance of a high-efficiency area of a high-temperature electric submersible pump of the SAGD high-temperature electric submersible pump well group in the prior art is difficult to exert.
In order to achieve the aim, the invention provides an injection-production control method of an SAGD high-temperature electric submersible pump well group, which comprises the following steps: step S10: determining the regulation factors and regulation indexes of the SAGD high-temperature electric submersible pump well group; step S20: determining a factor regulation limit of a regulation factor of the SAGD high-temperature electric submersible pump well group and an index regulation limit of a regulation index; step S30: regulating the regulating factor according to the factor regulating limit to make the regulating index within the index regulating limit.
Further, step S10 includes: and determining the regulation and control factors including the steam injection amount of the steam injection well, and determining the regulation and control indexes including the pumping temperature of the production well.
Further, step S20 includes: and determining the range of the steam injection amount of the steam injection well and the range of the pumping temperature of the production well, wherein the range of the pumping temperature of the production well is a first preset range, and the range of the steam injection amount of the steam injection well is a second preset range.
Further, step S30 includes: step S35: observing the pumping temperature of the production well; step S36: judging whether the temperature of the production well pump is within a first preset range or not, finishing balance regulation if the temperature of the production well pump is within the first preset range, and executing the step S361 if the temperature of the production well pump is out of the first preset range; step S361: judging whether the temperature of the production well pump is higher than a first preset range or not, and if the temperature of the production well pump is lower than the first preset range, executing the step S37; if the temperature of the production well pump is higher than a first preset range, executing a step S38; step S37: increasing the steam injection amount of the steam injection well, wherein the increased steam injection amount of the steam injection well is in a second preset range, and executing the step S35 when the temperature of a pump hanger of the production well is stable; step S38: and (5) reducing the steam injection amount of the steam injection well, wherein the reduced steam injection amount of the steam injection well is within a second preset range, and executing the step S35 when the temperature of the produced well pump is stable.
Further, in step S10, the control factor further includes a production increase and decrease factor, the production increase and decrease factor includes a frequency of the SAGD high-temperature electric submersible pump and/or a size of a nozzle of the production well, and the control index further includes a production well.
Further, step S20 further includes: and determining the range of the yield increase and decrease factor, wherein the range of the yield increase and decrease factor is a third preset range.
Further, before step S35, step S30 further includes: step S33: observing yield increase and decrease factors; step S34: judging whether the yield increasing and decreasing factor is within a third preset range after being changed by a predetermined amount, if so, executing step S341, and if not, executing step S342; step S341: changing the factors of increasing and decreasing the yield, and executing the step S35; step S342: the factors of increasing and decreasing the yield are kept unchanged, and the variable regulation and control of the yield are completed.
Further, the purpose of increasing the production well yield is achieved by increasing the frequency of the SAGD high-temperature electric submersible pump and/or increasing the size of the production well choke, and the purpose of reducing the production well yield is achieved by reducing the frequency of the SAGD high-temperature electric submersible pump and/or reducing the size of the production well choke.
Further, after completing the balance adjustment, step S30 further includes: step S39: observing the yield of the production well; step S40: and judging whether the production well meets the requirement after the production well is changed, finishing variable regulation of the production volume if the requirement is met, and executing the step S33 if the requirement is not met.
Further, in step S10, the control factor further includes the production well yield, and the control index further includes the optimal yield.
Further, step S20 further includes: and determining the range of the optimal production, wherein the frequency of different SAGD high-temperature electric submersible pumps corresponds to the range of different optimal production.
Further, before step S33, step S30 further includes: step S31: observing the frequency of the SAGD high-temperature electric submersible pump and the yield of a production well; step S32: judging whether the production well yield is in the range of the optimal yield, if so, finishing the optimal working condition regulation, if not, executing the step S33, and executing the step S31 after finishing the balance regulation.
Further, the first preset range is determined by the temperature resistance temperature of the SAGD high-temperature electric submersible pump.
By applying the technical scheme of the invention, firstly, the regulation and control factors and the regulation and control indexes of the SAGD high-temperature electric submersible pump well group are determined, then the factor regulation and control limit of the regulation and control factors and the index regulation and control limit of the regulation and control indexes are determined, and finally the regulation and control factors are regulated and controlled according to the factor regulation and control limit so that the regulation and control indexes are within the index regulation and control limit. The regulation and control method enables each regulation and control index of the SAGD high-temperature electric submersible pump well group to be within a preset ideal limit so as to exert the performance of the high-temperature electric submersible pump high-efficiency area to the maximum extent.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiment(s) 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 diagram of an embodiment of a method of injection-production regulation of a SAGD high temperature electric submersible pump well group according to the present invention;
FIG. 2 shows a flow diagram of the equilibrium regulation of the injection-production regulation method of the SAGD high temperature electric submersible pump well group of FIG. 1;
FIG. 3 shows a flow diagram of variable regulation of production capacity of the injection-production regulation method of the SAGD high temperature electric submersible pump well group of FIG. 1; and
FIG. 4 shows a flow chart of optimal condition regulation of the injection-production regulation method of the SAGD high-temperature electric submersible pump well group of FIG. 1.
Detailed Description
It should be noted that, in the present application, the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
As shown in fig. 1, the injection-production control method for the SAGD high-temperature electric submersible pump well group of this embodiment includes: step S10: determining the regulation and control factors and the regulation and control indexes of the SAGD high-temperature electric submersible pump well group; step S20: determining a factor regulation limit of a regulation factor of the SAGD high-temperature electric submersible pump well group and an index regulation limit of a regulation index; step S30: regulating the regulating factor according to the factor regulating limit to make the regulating index within the index regulating limit.
By applying the technical scheme of the invention, firstly, the regulation and control factors and the regulation and control indexes of the SAGD high-temperature electric submersible pump well group are determined, then the factor regulation and control limit of the regulation and control factors and the index regulation and control limit of the regulation and control indexes are determined, and finally the regulation and control factors are regulated and controlled according to the factor regulation and control limit so that the regulation and control indexes are within the index regulation and control limit. The regulation and control method enables each regulation and control index of the SAGD high-temperature electric submersible pump well group to be within a preset ideal limit so as to exert the performance of the high-temperature electric submersible pump high-efficiency area to the maximum extent.
As shown in fig. 2, in this embodiment, the injection-production control includes injection-production balance control of the SAGD high-temperature electric submersible pump well group, and only after the injection-production balance control is completed, the production well can enter normal production, otherwise, the SAGD high-temperature electric submersible pump is easily damaged, thereby affecting production. Specifically, in the present embodiment, step S10 includes: and determining the regulation and control factors including the steam injection amount of the steam injection well, and determining the regulation and control indexes including the pumping temperature of the production well. The pumping temperature of the production well can be regulated and controlled by regulating and controlling the steam injection quantity of the steam injection well so as to ensure that the pumping temperature of the production well is within a preset regulation and control limit. Because the SAGD high-temperature electric submersible pump has the upper temperature-resistant limit, once the pumping temperature of the production well exceeds the upper temperature-resistant limit of the SAGD high-temperature electric submersible pump, the SAGD high-temperature electric submersible pump is easy to damage in the production process of the production well. Therefore, in the embodiment, the pump-hanging temperature of the production well is regulated to reduce the damage probability of the SAGD high-temperature electric submersible pump and reduce the influence on the production of the oil well. In addition, in this embodiment, the pumping temperature of the production well is regulated and controlled by regulating and controlling the steam injection amount of the steam injection well, and the higher the steam injection amount is, the higher the pumping temperature of the production well is. The control mode is simple and convenient to control.
In the present embodiment, step S20 includes: and determining the range of the steam injection quantity of the steam injection well and the range of the pumping temperature of the production well. Specifically, the range of the steam injection amount of the steam injection well is determined, a value is selected in the range, and the sum of the conventional steam injection amount and the selected value is used as the actual steam injection amount to inject steam into the steam injection well.
In the present embodiment, step S30 includes: step S35: observing the pumping temperature of the production well; step S36: judging whether the temperature of the production well pump is within a first preset range or not, finishing balance regulation if the temperature of the production well pump is within the first preset range, and executing the step S361 if the temperature of the production well pump is out of the first preset range; step S361: judging whether the pumping temperature of the production well is higher than a first preset range or not, and if the pumping temperature of the production well is lower than the first preset range, executing a step S37; if the temperature of the pump hanger of the production well is higher than the first preset range, executing the step S38; step S37: increasing the steam injection amount of the steam injection well, wherein the increased steam injection amount of the steam injection well is within a second preset range, and executing the step S35 when the pumping temperature of the production well is stable; step S38: and reducing the steam injection amount of the steam injection well, wherein the reduced steam injection amount of the steam injection well is within a second preset range, and the temperature of the pump suspension of the production well is stable, and executing the step S35. In this embodiment, if the pumping temperature of the production well is not within the first preset range, the pumping temperature of the production well is changed by continuously increasing or decreasing the steam injection amount until the pumping temperature of the production well is within the first preset range. The specific regulation process of equilibrium regulation is briefly described below:
firstly, observing the pumping temperature of the production well, finishing balance regulation if the pumping temperature of the production well is within a preset temperature range, increasing the steam injection amount of the steam injection well by 12t/d if the pumping temperature of the production well is lower than a lower temperature limit, observing the pumping temperature of the production well once every 15 minutes, and keeping for 2 hours until the pumping temperature of the production well is continuously stable. If the pumping temperature of the production well is higher than the upper temperature limit, the steam injection amount of the steam injection well is reduced by 12t/d, the pumping temperature of the production well is observed every 15 minutes for 2 hours, and the pumping temperature of the production well is kept stable continuously. If the temperature of the pump hanger of the production well is not in the preset temperature range, the temperature of the pump hanger of the production well is regulated according to the method for regulating the steam injection amount of the steam injection well, the steam injection amount of the steam injection well is changed each time, and after the temperature of the pump hanger of the production well is continuously stable, whether the temperature of the pump hanger of the production well is in the preset temperature range is judged again, and the process is repeated until the temperature of the pump hanger of the production well is in the preset temperature range.
As shown in fig. 3, in the present embodiment, the injection-production control includes injection-production variable control of the SAGD high-temperature electric submersible pump well group. The above control method allows the production well production to be controlled. Specifically, in step S10, the control factor further includes a yield increase and decrease factor, where the yield increase and decrease factor includes the frequency of the SAGD high-temperature electric submersible pump and the size of the production well nozzle, and the control index further includes the production well yield. In the embodiment, the production well yield is changed by changing the frequency of the SAGD high-temperature electric submersible pump and/or the size of the production well oil nozzle, the purpose of increasing the production well yield can be achieved by increasing the frequency of the SAGD high-temperature electric submersible pump and the size of the production well oil nozzle, and the purpose of reducing the production well yield can be achieved by reducing the frequency of the SAGD high-temperature electric submersible pump and the size of the production well oil nozzle. The control mode is simple and convenient to control. Of course, in other embodiments, the yield factor may include one of a frequency of the SAGD high temperature electric submersible pump and a size of the production well choke.
In this embodiment, step S20 further includes: and determining the range of the yield increase and decrease factors, wherein the range of the yield increase and decrease factors is a third preset range.
In this embodiment, before step S35, step S30 further includes: step S33: observing yield increase and decrease factors; step S34: determining whether the yield increasing and decreasing factor is within a third preset range (the third preset range does not necessarily refer to only one range, and if the yield increasing and decreasing factor is multiple, the third preset range includes multiple sub-ranges corresponding to the multiple yield increasing and decreasing factors one by one), if the yield increasing and decreasing factor is within the third preset range after the change, executing step S341, and if the yield increasing and decreasing factor is outside the third preset range after the change, executing step S342; step S341: changing the yield increase and decrease factors, and executing the step S35; step S342: the factors of increasing and decreasing the yield are kept unchanged, and the variable regulation and control of the yield are completed.
Specifically, in the embodiment, the production increase and decrease factors comprise the frequency of the SAGD high-temperature electric submersible pump and the size of the production well choke, and the third preset range comprises a first sub-range corresponding to the frequency of the high-temperature electric submersible pump and a second sub-range corresponding to the size of the production well choke. If the production is required to be increased, a certain frequency value is added on the basis of the frequency of the original SAGD high-temperature electric submersible pump, and a certain size value is added on the basis of the size of the original production well oil nozzle. If the production is required to be reduced, a certain frequency value is subtracted on the basis of the frequency of the original SAGD high-temperature electric submersible pump, and a certain size value is subtracted on the basis of the size of the original production well nozzle. However, for the frequency of the SAGD high-temperature electric submersible pump, if the frequency of the SAGD high-temperature electric submersible pump exceeds the upper limit of the first sub-range after a certain frequency value is added, the operation of increasing the frequency is not executed; if the frequency of the SAGD high temperature electrical submersible pump, after subtracting a certain frequency value, is below the lower limit of the first sub-range, no frequency reduction operation is performed. For a production well nozzle tip, no operation is performed to increase the size of the production well nozzle tip if the size of the production well nozzle tip exceeds the upper limit of the second sub-range after a certain size value is added. If the size of the production well nozzle tip, after subtracting a certain size value, is less than the lower limit of the second sub-range, then no operation is performed to reduce the size of the production well nozzle tip. The structure can increase or reduce the yield as much as possible according to the requirements under the condition of ensuring that the frequency of the SAGD high-temperature electric submersible pump and the size of the oil nozzle of the production well are both within a third preset range.
It should be noted that the change of the frequency of the SAGD high-temperature electric submersible pump and the change of the size of the production well choke lead to the change of the production well pumping temperature, so in order to prevent the production well pumping temperature from being too high, the SAGD high-temperature electric submersible pump well group needs to be balanced and controlled after the frequency and the size are changed.
In this embodiment, after completing the balance adjustment, step S30 further includes: step S39: observing the yield of the production well; step S40: and judging whether the production well output is changed and meets the requirement, if so, finishing variable regulation of the output, and if not, executing the step S33. In particular, if the production well production has met the requirements after equilibrium regulation, the variable regulation of production is complete. And if the yield of the production well does not meet the requirement after the balance regulation, judging whether all the factors for increasing and decreasing the yield are not in a third preset range after being changed by the preset amount, if so, indicating that the yield of the production well cannot be regulated by regulating the factors for increasing and decreasing the yield, and thus, completing the variable regulation of the yield. But if the judgment result is negative, the production well yield can still be adjusted by adjusting the factors of increasing and decreasing the production.
The specific regulation and control process of injection-production yield increase regulation and control is briefly introduced as follows:
observing the frequency of the high-temperature electric submersible pump, and if the frequency of the high-temperature electric submersible pump is still within the first sub-range after being increased by 5Hz, increasing the frequency of the high-temperature electric submersible pump by 5Hz; then, the production well nozzle tip size is observed, and if the production well nozzle tip size is still within the second sub-range after increasing by 1mm, then increasing by 1mm the production well nozzle tip. And repeating the process of balance regulation after changing the frequency of the high-temperature electric submersible pump and the size of the oil nozzle of the production well, observing the yield of the production well after the balance regulation is finished, and finishing the yield increase regulation of the yield if the yield of the production well meets the requirement. If the production well yield does not meet the requirement after the balance regulation, whether all the factors for increasing and decreasing the production are not in a third preset range after being changed by preset amount (5 hz and 1mm in the embodiment) is judged, and if the judgment result is yes, the variable regulation of the production is also finished. If the determination is negative, production may still be increased by increasing the high temperature electrical submersible pump frequency and/or increasing the production well nozzle size.
The specific regulation and control process of injection-production yield reduction regulation and control is briefly introduced as follows:
observing the frequency of the high-temperature electric submersible pump, and if the frequency of the high-temperature electric submersible pump is still within the first sub-range after being reduced by 5Hz, reducing the frequency of the high-temperature electric submersible pump by 5Hz; then, the production well nozzle tip size is observed, and if the production well nozzle tip size is still within the second sub-range after increasing by 1mm, then decreasing by 1mm. And repeating the process of the balance regulation after changing the frequency of the high-temperature electric submersible pump and the size of the oil nozzle of the production well, observing the yield of the production well after the balance regulation is finished, and finishing the yield reduction regulation of the yield if the yield of the production well meets the requirement. And if the yield of the production well does not meet the requirement after the balance regulation, and all factors for increasing and decreasing the yield are not in a third preset range after being changed by the preset amount, the yield-reducing regulation is finished. If the production well production is not satisfactory after the balance adjustment, but at least one yield factor is within a third predetermined range after the change by a predetermined amount (5 hz and 1mm in this example), then the high temperature electrical submersible pump frequency is further decreased and/or the production well nozzle size is decreased to decrease production.
As shown in fig. 4, in this embodiment, the injection-production control includes SAGD high-temperature electric submersible pump well group optimal condition control. The control method enables all parameters to be in an optimal range, so that the efficiency of the SAGD high-temperature electric submersible pump well group is the highest. Specifically, in this embodiment, in step S10, the control factor further includes the production well yield, and the control index further includes the optimal yield. It should be noted that, in the above description, the production well yield is used as a control index in the injection-production variable control, and in the optimal working condition control, the control index "production well yield" is used as a control factor to control a new control index "optimal yield". In addition, the frequency of the SAGD high-temperature electric submersible pump also serves as a main regulation factor for regulating the 'best yield'.
In this embodiment, step S20 further includes: and determining the range of the optimal production, wherein the frequency of different SAGD high-temperature electric submersible pumps corresponds to the range of different optimal production. Preferably, the range of optimal yields comprises six different sub-ranges, 35Hz-76t/d + -5 t/d, 40Hz-83t/d + -5 t/d, 45Hz-94t/d + -5 t/d, 50Hz-104t/d + -5 t/d, 55Hz-115t/d + -5 t/d, 60Hz-125t/d + -5 t/d, i.e.one sub-range for each frequency.
In this embodiment, before step S33, step S30 further includes: step S31: observing the frequency of the SAGD high-temperature electric submersible pump and the production well yield; step S32: judging whether the production well yield is in the range of the optimal yield, if so, finishing the optimal working condition regulation, if not, executing the step S33, and executing the step S31 after finishing the balance regulation. If the production well yield is not in the range of the optimal yield, performing injection-production variable control, observing the frequency of the SAGD high-temperature electric submersible pump and the production well yield again after the control is finished, judging whether the production well yield is in the range of the optimal yield, and circulating the steps until the production well yield is in the range of the optimal yield.
The specific regulation process of the optimal working condition regulation is briefly introduced as follows:
firstly, observing the yield of the production well and the frequency of the SAGD high-temperature electric submersible pump, if the yield of the production well is out of the optimal yield range corresponding to the current frequency, performing injection-production variable regulation and balanced regulation, after the balanced regulation is finished, observing the yield of the production well and the frequency of the SAGD high-temperature electric submersible pump again, judging whether the yield of the production well is in the optimal yield range corresponding to the current frequency, and circulating the steps until the yield of the production well is in the optimal yield range corresponding to the current frequency, namely finishing the optimal working condition regulation.
In the embodiment, the first preset range is determined by the temperature resistance of the SAGD high-temperature electric submersible pump. For example, the temperature resistance temperature of the SAGD high-temperature electric submersible pump is 218 ℃, then the upper limit of the first preset range is 195 ℃ and the lower limit of the temperature is 185 ℃.
The injection and production control method is described in detail by taking the best working condition control of the SAGD high-temperature electric submersible pump well group of the Xinjiang Fengcheng super heavy oil reservoir as an example:
in the embodiment, the buried depth of a shallow 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.
Step 1, determining injection and production regulation factors and regulation indexes of an SAGD high-temperature electric submersible pump well group; wherein the regulatory factors include: 105t/d of steam injection quantity of the steam injection well, 120t/d of production well yield, 3mm of production well choke nipple size, 197 ℃ of pumping temperature of the production well, 40Hz of high-temperature electric submersible pump frequency and 218 ℃ of high-temperature electric submersible pump temperature resistance. The regulation and control indexes comprise: production well pumping temperature, production well yield and optimal yield;
step 2, determining the regulation and control factors and the regulation and control index limit of the SAGD high-temperature electric submersible pump well group; wherein the first preset range is between 185 ℃ and 195 ℃, namely the upper temperature limit is 195 ℃ and the lower temperature limit is 185 ℃; the second preset range is between 10t/d and 14 t/d; a first sub-range (frequency) between 35Hz to 60 Hz; a second subrange (nozzle size) is between 2mm to 50 mm; the range of the optimal yield comprises six different sub-ranges which are respectively 35Hz-76t/d +/-5 t/d, 40Hz-83t/d +/-5 t/d, 45Hz-94t/d +/-5 t/d, 50Hz-104t/d +/-5 t/d, 55Hz-115t/d +/-5 t/d and 60Hz-125t/d +/-5 t/d;
step 3, injection and production regulation and control are carried out according to injection and production regulation and control factors and injection and production regulation and control limits, the frequency of the high-temperature electric submersible pump is 40Hz, the yield of the production well is 120t/d, the high-temperature electric submersible pump is deviated from the high-efficiency operation point 83t/d of the high-temperature electric submersible pump under 40Hz, and the yield is reduced by reducing the frequency of the high-temperature electric submersible pump and reducing the size of a production well oil nozzle;
step 4, reducing the frequency of 40Hz to 35Hz within the frequency limit of 35 Hz-60 Hz, wherein the frequency is reduced by 5Hz;
step 5, reducing the size of the oil nozzle of the production well by 1mm when the size of the oil nozzle of the production well is 3mm within the limit of the oil nozzle of 2 mm-50 mm, wherein the size of the oil nozzle of the production well is 2mm;
step 6, selecting 12t/d in a second preset range, reducing the steam injection amount of the steam injection well by 12t/d to reduce the steam injection amount of the steam injection well to 93t/d, observing the pumping temperature of the production well once every 15 minutes, and after stabilizing after 2 hours, controlling the pumping temperature of the production well to be 196 ℃, and exceeding the upper temperature limit;
step 7, reducing the steam injection amount of the steam injection well by 12t/d to 81t/d, observing the pumping temperature of the production well once every 15 minutes, and after the temperature is stabilized after 2 hours, keeping the pumping temperature of the production well at 196 ℃ and exceeding the upper temperature limit;
step 8, reducing the steam injection amount of the steam injection well by 12t/d, wherein the steam injection amount of the steam injection well is 69t/d, observing the pumping temperature of the production well once every 15 minutes, and after the temperature is stabilized after 2 hours, the pumping temperature of the production well is 188 ℃, and the temperature is between a first preset range of 185 ℃ and 195 ℃;
and 9, observing the yield of the production well, wherein the yield of the production well is 80t/d, and the optimal yield is 76t/d +/-5 t/d under the condition of 35Hz of the high-temperature electric submersible pump, so that the yield of the production well is within the optimal yield range under the current frequency, and the optimal working condition regulation is completed.
The parameters of the regulated and controlled SAGD high-temperature electric submersible pump well group under the optimal working condition are as follows: the steam injection amount of the steam injection well is 69t/d, the frequency of the high-temperature electric submersible pump is 35Hz, the size of a production well oil nozzle is 2mm, the pumping temperature of the production well is 188 ℃, and the yield of the production well is 80t/d.
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 an SAGD high-temperature electric submersible pump well group injection-production regulating method for a shallow viscous ultra-heavy oil reservoir. The injection-production regulating method can be used for production regulation and control of the SAGD high-temperature electric submersible pump well group, including injection-production balance regulation and control, injection-production yield regulation and control under the optimal working condition, sub-cool reasonable control is realized, the production capacity of the SAGD oil well is excavated to the maximum extent, and the performance of the high-temperature electric submersible pump high-efficiency area is exerted to the maximum extent.
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 (8)
1. An injection-production control method of an SAGD high-temperature electric submersible pump well group is characterized by comprising the following steps:
step S10: determining the regulation factors and regulation indexes of the SAGD high-temperature electric submersible pump well group;
step S20: determining a factor regulation limit of the regulation factor and an index regulation limit of the regulation index of the SAGD high-temperature electric submersible pump well group;
step S30: regulating the regulatory factor according to the factor regulation limit such that the regulatory indicator is within the indicator regulation limit;
the step S10 includes: determining the regulation and control factors to include the steam injection amount of a steam injection well, and determining the regulation and control indexes to include the pumping temperature of a production well;
the step S20 includes: determining the range of the steam injection amount of the steam injection well and the range of the pumping temperature of the production well, wherein the range of the pumping temperature of the production well is a first preset range, and the range of the steam injection amount of the steam injection well is a second preset range;
the step S30 includes:
step S35: observing the pumping temperature of the production well;
in the step S10, the regulation and control factors further include an increase and decrease factor, the increase and decrease factor includes the frequency of the SAGD high-temperature electric submersible pump and the size of a nozzle of the production well, and the regulation and control index further includes the production well yield;
the step S20 further includes: determining the range of the yield increase and decrease factor, wherein the range of the yield increase and decrease factor is a third preset range;
before the step S35, the step S30 further includes:
step S33: observing the yield increase and decrease factor;
step S34: judging whether the yield increase and decrease factor is within the third preset range after being changed by a predetermined amount, if so, executing step S341, and if not, executing step S342;
the step S341: changing the yield increase and decrease factor, and executing the step S35;
the step S342: the factors for increasing and decreasing the yield are kept unchanged, and the variable regulation and control of the yield are completed;
the third preset range comprises a first sub-range corresponding to the frequency of the high-temperature electric submersible pump and a second sub-range corresponding to the size of a production well nozzle;
for the frequency of the SAGD high-temperature electric submersible pump, if the frequency of the SAGD high-temperature electric submersible pump exceeds the upper limit of the first sub-range after a certain frequency value is added, the operation of increasing the frequency is not executed; if the frequency of the SAGD high-temperature electric submersible pump is lower than the lower limit of the first sub-range after a certain frequency value is subtracted, the operation of reducing the frequency is not executed;
for a production well choke, not performing the operation of increasing the size of the production well choke if the size of the production well choke exceeds the upper limit of the second sub-range after a certain size value is added; if the size of the production well nozzle tip, after subtracting a certain size value, is less than the lower limit of the second sub-range, then no operation is performed to reduce the size of the production well nozzle tip.
2. The injection-production regulating method according to claim 1, wherein the step S30 further comprises:
step S36: judging whether the pumping temperature of the production well is within the first preset range, finishing balance regulation if the pumping temperature of the production well is within the first preset range, and executing step S361 if the pumping temperature of the production well is out of the first preset range;
the step S361: judging whether the pumping temperature of the production well is higher than the first preset range or not, and if the pumping temperature of the production well is lower than the first preset range, executing the step S37; if the pumping temperature of the production well is higher than the first preset range, executing a step S38;
the step S37: increasing the steam injection amount of the steam injection well, wherein the increased steam injection amount of the steam injection well is within the second preset range, and the step S35 is executed when the temperature of the pump hanger of the production well is stable;
the step S38: and reducing the steam injection amount of the steam injection well, wherein the reduced steam injection amount of the steam injection well is within the second preset range, and the step S35 is executed when the temperature of the pump hanger of the production well is stable.
3. The injection-production control method according to claim 2, wherein the purpose of increasing the production well production is achieved by increasing the frequency of the SAGD high-temperature electric submersible pump and/or increasing the size of the production well choke, and the purpose of reducing the production well production is achieved by decreasing the frequency of the SAGD high-temperature electric submersible pump and/or decreasing the size of the production well choke.
4. The injection-production regulating method according to claim 2, wherein after the balance regulation is completed, the step S30 further includes:
step S39: observing the production well production;
step S40: and judging whether the production well meets the requirement after the production well is changed, finishing variable regulation of the production volume if the requirement is met, and executing the step S33 if the requirement is not met.
5. The injection-production control method according to claim 2, wherein in the step S10, the control factor further includes the production well yield, and the control index further includes an optimal yield.
6. The injection-production regulating method according to claim 5, wherein the step S20 further comprises: determining the range of the optimal production, wherein the frequency of different SAGD high-temperature electric submersible pumps corresponds to the range of different optimal production.
7. The injection-production regulating method according to claim 5, wherein before the step S33, the step S30 further includes:
step S31: observing the frequency of the SAGD high-temperature electric submersible pump and the production well production;
step S32: judging whether the production well yield is in the range of the optimal yield, if so, finishing the optimal working condition regulation, if not, executing the step S33, and executing the step S31 after finishing the balance regulation.
8. The injection-production control method according to claim 1, wherein the first preset range is determined by the temperature resistance of the SAGD high-temperature electric submersible pump.
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| CN201963283U (en) * | 2011-03-16 | 2011-09-07 | 中国石油天然气股份有限公司 | Dual tubing high-temperature gas lift process pipe string |
| CA2820702A1 (en) * | 2012-06-29 | 2013-12-29 | Nexen Inc. | Sagdox operation in leaky bitumen reservoirs |
| 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 |
| CN103615199A (en) * | 2013-11-28 | 2014-03-05 | 中国石油天然气股份有限公司 | Oil extraction processing device for achieving steam injection, oil extraction and temperature-pressure real-time monitoring in shaft of horizontal well with three tubes |
| CN103835687B (en) * | 2014-02-18 | 2016-08-17 | 新疆金牛能源物联网科技股份有限公司 | A kind of method and device of SAGD well steam injection flow-control |
| CN104196506B (en) * | 2014-08-01 | 2017-05-17 | 中国石油大学(北京) | Injection and production parameter joint debugging method, device and system for SAGD single well set |
| CN105756641A (en) * | 2014-12-17 | 2016-07-13 | 中国石油天然气股份有限公司 | Method for judging communication of double horizontal wells during circulating preheating of SAGD (steam assisted gravity drainage) |
| CN106837249A (en) * | 2015-12-03 | 2017-06-13 | 中国石油天然气股份有限公司 | Producing well |
| CN205638401U (en) * | 2016-04-28 | 2016-10-12 | 中国石油天然气股份有限公司 | Gravity draining tee pipe steam injection tubular post is assisted to two horizontal well steam |
| US10794162B2 (en) * | 2017-12-12 | 2020-10-06 | Baker Hughes, A Ge Company, Llc | Method for real time flow control adjustment of a flow control device located downhole of an electric submersible pump |
| CN108708700A (en) * | 2018-05-18 | 2018-10-26 | 中国石油天然气股份有限公司 | A kind of method of SAGD technology application effects in improvement heterogeneous reservoir |
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