CN115110934A - Thickened oil injection and production system and horizontal well production process method - Google Patents
Thickened oil injection and production system and horizontal well production process method Download PDFInfo
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- CN115110934A CN115110934A CN202110296959.4A CN202110296959A CN115110934A CN 115110934 A CN115110934 A CN 115110934A CN 202110296959 A CN202110296959 A CN 202110296959A CN 115110934 A CN115110934 A CN 115110934A
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- oil
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- well
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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
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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
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
Abstract
The invention provides a thickened oil injection and production system and a horizontal well production process method, wherein the thickened oil injection and production system comprises a double-pipe thermal recovery wellhead device, a first oil pipe and a second oil pipe, and the double-pipe thermal recovery wellhead device is arranged outside a well barrel of the horizontal well and is positioned on the ground; a first oil pipe positioned in a shaft of the horizontal well is communicated with a double-pipe thermal recovery wellhead device; the second oil pipe is positioned in a shaft of the horizontal well and is arranged adjacent to the first oil pipe, and the second oil pipe is communicated with the double-pipe thermal recovery wellhead device; before oil pumping operation is carried out, steam is injected into at least one of the first oil pipe and the second oil pipe so that the steam is diffused to an oil layer, after the steam is diffused, the bimetallic screw pump and the sucker rod are lowered to one of the first oil pipe and the second oil pipe so as to carry out oil pumping operation, and the test pipe is lowered to the other one of the first oil pipe and the second oil pipe so as to monitor the downhole temperature of the horizontal well in real time. The invention solves the problem that the exploitation process of the thickened oil horizontal well in the prior art is complex.
Description
Technical Field
The invention relates to the technical field of heavy oil reservoir exploitation, in particular to a heavy oil injection and exploitation system and a horizontal well production process method.
Background
In the process of developing the heavy oil reservoir, an inclined straight horizontal well can be adopted for the oil reservoir with the reservoir depth of less than 250m, the inclined straight horizontal well, namely a ground drilling machine, is drilled at an angle of 30-45 degrees with the vertical ground direction when being drilled, a vertical well section is not formed, and the oil reservoir is deviated to the horizontal section of the oil reservoir drill to complete the well. The oil extraction process of the inclined straight horizontal well is different from that of a conventional straight well and a vertical horizontal well, because a well head is installed in an inclined mode, if a sucker rod pump is adopted for lifting, the oil extraction process must be matched with an oil pumping unit special for the inclined well, an oil well pump, a workover rig and the like, the downward penetration depth of the oil well pump is limited, the oil well pump is low in efficiency, complex to operate and high in cost, and the oil well pump is difficult to apply in a large scale; in addition, the existing steam huff and puff vertical well adopts a bimetallic screw pump lifting process, and is only suitable for a thick oil vertical well due to low discharge capacity and cannot be used for a thick oil horizontal well.
Disclosure of Invention
The invention mainly aims to provide a thickened oil injection and production system and a horizontal well production process method, so as to solve the problem that the thickened oil horizontal well in the prior art is complex in production process.
In order to achieve the above object, according to one aspect of the present invention, there is provided a thick oil injection and production system for performing thick oil production on a horizontal well, comprising a dual-pipe thermal production wellhead, a first oil pipe and a second oil pipe, wherein the dual-pipe thermal production wellhead is arranged outside a well casing of the horizontal well and is located on the ground; the first oil pipe is positioned in a shaft of the horizontal well, the first end of the first oil pipe is communicated with the double-pipe thermal recovery wellhead device, and the second end of the first oil pipe extends along the extension direction of the horizontal well; the second oil pipe is positioned in a shaft of the horizontal well and is arranged adjacent to the first oil pipe, the first end of the second oil pipe is communicated with the double-pipe thermal recovery wellhead device, and the second end of the second oil pipe extends along the extension direction of the horizontal well; before oil pumping operation is carried out, steam is injected into at least one of the first oil pipe and the second oil pipe so that the steam is diffused towards an oil layer, after the steam is diffused, the bimetallic screw pump and the sucker rod are lowered to one of the first oil pipe and the second oil pipe and connected with each other so as to carry out oil pumping operation, and the test tube is lowered to the other one of the first oil pipe and the second oil pipe so as to monitor the downhole temperature of the horizontal well in real time.
Furthermore, the horizontal well sequentially comprises a first well section, a transition section and a second well section which are connected in the direction far away from the ground, the second well section extends along the horizontal direction, the heavy oil injection and production system further comprises an oil well casing and a sieve tube, wherein the oil well casing is arranged in a shaft of the horizontal well and extends from the first well section to the transition section, the first oil pipe is positioned in the oil well casing, part of the second oil pipe is positioned in the oil well casing, and the first end of the oil well casing is connected with the shell of the double-pipe thermal production wellhead device; the screen pipe is arranged in a shaft of the horizontal well and positioned in a second well section, the screen pipe is connected with the second end of the oil well casing through a screen pipe hanger, and the second end of the second oil pipe extends out of the oil well casing and extends into the screen pipe; the first oil pipe is used for lowering the bimetallic screw pump, and the second oil pipe is used for lowering the test pipe.
Further, the first oil pipe is parallel to the second oil pipe.
Furthermore, the second end of the first oil pipe is connected with a stator of the bimetallic screw pump, the sucker rod is positioned in the first oil pipe, the first end of the sucker rod is connected with a rotor of the bimetallic screw pump, and the sucker rod and the rotor are lifted to open the steam injection channel before steam is injected into the first oil pipe.
Furthermore, the thickened oil injection-production system also comprises a screw pump driving device and a polished rod, wherein the screw pump driving device is arranged on the double-pipe thermal production wellhead device and is in driving connection with the bimetallic screw pump; the second end of the sucker rod is connected with the first end of the polished rod, and the second end of the polished rod penetrates through the double-pipe thermal recovery wellhead device to be connected with the screw pump driving device.
Furthermore, the thickened oil injection and production system further comprises a limiting device, the limiting device is connected with one end, far away from the first oil pipe, of the stator, and when the rotor is placed into the stator, the limiting device limits the rotor.
Furthermore, the thickened oil injection and production system also comprises a tail pipe, wherein the first end of the tail pipe is connected with one end, far away from the stator, of the limiting device, and the second end of the tail pipe is connected with the plug.
Furthermore, the thickened oil injection and production system also comprises a plurality of sucker rod centralizers, each sucker rod comprises a plurality of connected sucker rod sections, and at least one sucker rod centralizer is arranged between every two adjacent sucker rod sections.
Furthermore, the thickened oil injection and production system further comprises a display device, the display device is arranged on the ground, the test tube penetrates through the double-tube thermal production wellhead device and is connected with the display device, and the display device is used for providing temperature information monitored by the test tube.
According to another aspect of the invention, a process method for producing a horizontal well is provided, which is used for exploiting thick oil from the horizontal well through a thick oil injection and production system, wherein the thick oil injection and production system is the thick oil injection and production system, and the process method comprises the following steps: injecting steam into at least one of the first tubing and the second tubing to diffuse the steam to the reservoir; and after the steam finishes the diffusion operation, putting the bimetallic screw pump and the sucker rod into one of the first oil pipe and the second oil pipe, connecting the bimetallic screw pump and the sucker rod to perform oil pumping operation, and putting the test tube into the other one of the first oil pipe and the second oil pipe to monitor the downhole temperature of the horizontal well in real time.
Further, the process method also comprises the following steps: before injecting steam into at least one of the first oil pipe and the second oil pipe, the sucker rod in the first oil pipe and the rotor of the bimetallic screw pump are lifted to open the steam injection passage.
The technical scheme of the invention provides a thick oil injection and production system with a first oil pipe and a second oil pipe, so that steam is injected into at least one of the first oil pipe and the second oil pipe before oil pumping operation is carried out, so that the steam is diffused to an oil layer, after the steam is diffused, a bimetallic screw pump is lowered into one of the first oil pipe and the second oil pipe, so that oil pumping operation is carried out, a test pipe is lowered into the other of the first oil pipe and the second oil pipe, so that the downhole temperature of the horizontal well is monitored in real time, the thick oil injection and production system is set to be in a structural form comprising the first oil pipe and the second oil pipe, so that the steam injection operation and the oil pumping operation can share one set of devices, and the convenience in production of the thick oil horizontal well is greatly improved.
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 schematic flow diagram of a process for horizontal well production according to an alternative embodiment of the present invention;
fig. 2 shows a schematic structural diagram of a heavy oil injection and production system according to an alternative embodiment of the present invention.
Wherein the figures include the following reference numerals:
10. a dual pipe thermal recovery wellhead assembly; 20. a first oil pipe; 30. a second oil pipe; 40. a bi-metal screw pump; 50. a test tube; 60. an oil well casing; 70. a screen pipe; 71. a screen hanger; 80. a sucker rod; 90. a screw pump drive unit; 100. a polish rod; 110. a tail pipe; 120. a sucker rod centralizer; 130. a display device.
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. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. 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.
The invention provides a thickened oil injection and production system and a horizontal well production process method, aiming at solving the problem that the thickened oil horizontal well in the prior art is complex in production process.
As shown in fig. 1, the process method for producing the horizontal well is to perform thickened oil recovery on the horizontal well through a thickened oil injection and recovery system, wherein the thickened oil injection and recovery system is the thickened oil injection and recovery system described above and below, and the process method comprises the following steps: injecting steam into at least one of the first oil pipe 20 and the second oil pipe 30 to diffuse the steam to the reservoir; after the steam finishes the diffusion operation, the bimetallic screw pump 40 and the sucker rod 80 are lowered to one of the first oil pipe 20 and the second oil pipe 30, the bimetallic screw pump 40 is connected with the sucker rod 80 to perform oil pumping operation, and the test tube 50 is lowered to the other one of the first oil pipe 20 and the second oil pipe 30 to monitor the downhole temperature of the horizontal well in real time.
As shown in fig. 1, the process further comprises the following steps: before injecting steam into at least one of the first oil pipe 20 and the second oil pipe 30, the sucker rod 80 in the first oil pipe 20 and the rotor of the bimetallic screw pump 40 are lifted to open the steam injection passage.
It should be noted that, in the present application, after the steam injection operation is completed, the sucker rod 80 and the rotor of the bimetallic screw pump 40 are lowered into the first oil pipe 20 to perform the oil pumping operation.
As shown in fig. 2, the thick oil injection and production system is used for thick oil production of a horizontal well, and comprises a double-pipe thermal production wellhead device 10, a first oil pipe 20 and a second oil pipe 30, wherein the double-pipe thermal production wellhead device 10 is arranged outside a well barrel of the horizontal well and is positioned on the ground; the first oil pipe 20 is positioned in a shaft of a horizontal well, a first end of the first oil pipe 20 is communicated with the double-pipe thermal recovery wellhead device 10, and a second end of the first oil pipe 20 extends along the extension direction of the horizontal well; the second oil pipe 30 is positioned in a shaft of the horizontal well and is arranged adjacent to the first oil pipe 20, a first end of the second oil pipe 30 is communicated with the double-pipe thermal recovery wellhead device 10, and a second end of the second oil pipe 30 extends along the extension direction of the horizontal well; wherein, before the oil pumping operation, steam is injected into at least one of the first oil pipe 20 and the second oil pipe 30 to diffuse the steam to the oil layer, after the steam finishes the diffusion operation, the bimetallic screw pump 40 and the sucker rod 80 are lowered to one of the first oil pipe 20 and the second oil pipe 30, the bimetallic screw pump 40 and the sucker rod 80 are connected to perform the oil pumping operation, and the test tube 50 is lowered to the other one of the first oil pipe 20 and the second oil pipe 30 to monitor the downhole temperature of the horizontal well in real time.
The application provides a viscous crude injection and production system with first oil pipe 20 and second oil pipe 30, thus, before carrying out the oil pumping operation, to at least one injection steam in first oil pipe 20 and the second oil pipe 30, so that steam diffuses to the oil reservoir, treat that steam accomplishes the diffusion operation after, lay bimetal screw pump 40 to one in first oil pipe 20 and the second oil pipe 30, thereby carry out the oil pumping operation, lay test tube 50 to another in first oil pipe 20 and the second oil pipe 30 simultaneously, thereby the downhole temperature of real-time supervision horizontal well, through setting the structural style including first oil pipe 20 and second oil pipe 30 with the viscous crude injection and production system, make steam injection operation and oil pumping operation can share one set of device, the convenience of the exploitation of viscous crude horizontal well has been promoted greatly.
It should be noted that in the present application, the first tubing 20 is sealingly connected to the dual thermal recovery wellhead 10.
As shown in fig. 2, the horizontal well sequentially comprises a first well section, a transition section and a second well section which are connected in a direction away from the ground, the second well section extends along the horizontal direction, the heavy oil injection and production system further comprises an oil well casing 60 and a screen pipe 70, wherein the oil well casing 60 is arranged in a shaft of the horizontal well and extends from the first well section to the transition section, the first oil pipe 20 is positioned in the oil well casing 60, part of the second oil pipe 30 is positioned in the oil well casing 60, and a first end of the oil well casing 60 is connected with a shell of the double-pipe thermal production wellhead device 10; a screen 70 is positioned in the wellbore of the horizontal well at the second interval, the screen 70 being connected to the second end of the well casing 60 by a screen hanger 71, the second end of the second tubing 30 extending out of the well casing 60 and into the screen 70; the first oil pipe 20 is used for lowering the bimetallic screw pump 40, and the second oil pipe 30 is used for lowering the test tube 50. Thus, the bi-metal screw pump 40 is used for pumping operations and the test tube 50 is used for real-time monitoring of the downhole temperature of the horizontal well.
Optionally, the length of the second oil pipe 30 is greater than that of the first oil pipe 20, the second end of the second oil pipe 30 extends out of the well casing 60 and extends into the screen 70 and extends to the toe end of the horizontal section, the test tube 50 is also lowered to the toe end of the horizontal section, the outer diameter of the test tube 50 is smaller than the inner diameter of the second oil pipe 30, the test tube 50 can also be used for judging the change of the phase state of the injected steam, and analyzing the communication degree between horizontal wells, the utilization degree of the horizontal section and the communication between the horizontal well and the surrounding vertical well.
Optionally, a first end of the screen 70 is connected to a second end of the well casing 60 by a screen hanger 71, the second end of the screen 70 extending horizontally to the toe end of the second interval, the screen hanger 71 being disposed inside the well casing 60 at the end of the well casing 60 and forming a seal with the well casing 60, the screen hanger 71 being in sealing connection with the screen 70. Thus, because the screen hanger 71 is disposed inside the well casing 60 at the end of the well casing 60, the first tubing 20 is prevented from expanding in length when heated and damaging the screen hanger 71.
Optionally, the first well section may be an inclined well section or a straight well section, the transition section is in an arc shape, when the first well section is the inclined well section, the first well section and the vertical direction form a preset angle, and the horizontal well is an inclined straight horizontal well; and when the first well section is a straight well section, the first well section is vertical to the horizontal direction, and the horizontal well is a vertical horizontal well.
It should be noted that, in this application, the second oil pipe 30 can inject steam as required, and the test tube 50 is put down after completing steam injection operation, and the test tube 50 can test the liquid level in the well of the horizontal well, measure the temperature profile of the shaft, and the like.
As shown in fig. 2, the first oil pipe 20 is parallel to the second oil pipe 30. Like this, avoid having the contained angle and leading to occuping the great installation space of oil well casing 60 because of first oil pipe 20 and second oil pipe 30, in addition, still be favorable to reducing the manufacturing difficulty of first oil pipe 20 and second oil pipe 30 to and ensure first oil pipe 20 and second oil pipe 30's the convenience of transferring.
Alternatively, when first tubing 20 is parallel to second tubing 30, second tubing 30 may employ inner and inner ferrule tubing.
As shown in fig. 2, the second end of the first oil pipe 20 is connected to the stator of the bimetal screw pump 40, the sucker rod 80 is located in the first oil pipe 20, and the first end of the sucker rod 80 is connected to the rotor of the bimetal screw pump 40, so that the sucker rod 80 and the rotor are lifted to open the steam injection passage before injecting steam into the first oil pipe 20. Therefore, the steam injection reliability of the steam injection channel is ensured, in addition, after the steam injection operation is completed, the oil pumping operation is carried out, the oil pumping operation needs to simultaneously lower the oil pumping rod 80 and the rotor, then the lifting operation is completed, and the well repairing operation is not needed from the steam injection operation to the oil pumping operation.
Alternatively, lifting the sucker rod 80 and rotor means lifting the sucker rod 80 and rotor 8 m.
Optionally, sucker rod 80 is suspended inside first oil pipe 20.
It should be noted that, in the present application, considering that the side of the stator of the bimetallic screw pump 40 away from the first oil pipe 20 is not provided with the oil pipe anchoring device, the first oil pipe 20 needs to adopt an external thickened oil pipe. Therefore, the structural strength of the first oil pipe 20 is ensured, so that the first oil pipe 20 can bear enough torque, and the phenomenon that the first oil pipe 20 is tripped due to the fact that the first oil pipe 20 is driven to rotate in the rotating process of the rotor of the bimetallic screw pump 40 is avoided.
Alternatively, when the horizontal well is a deviated horizontal well, the position where the transition section is connected to the horizontal section extends in the horizontal direction, the end of the well casing 60 near the transition section extends in the horizontal direction by 30m, the wellbore curvature is less than 3 °/30m, the bimetallic screw pump 40 is located at the horizontal position of the section within the well casing 60, and the screen hanger 71 is disposed inside the well casing 60 at the end of the well casing 60, and the distance between the screen hanger 71 and the bimetallic screw pump 40 is 10 m.
As shown in fig. 2, the heavy oil injection and production system further comprises a screw pump driving device 90 and a polished rod 100, wherein the screw pump driving device 90 is arranged on the connection of the double-pipe thermal production wellhead device 10 and is in driving connection with the bimetallic screw pump 40; the second end of the sucker rod 80 is connected to a first end of a polished rod 100, and the second end of the polished rod 100 is connected to a screw pump drive 90 through the dual thermal recovery wellhead 10. In this way, the driving reliability of the screw pump driving device 90 for the bimetallic screw pump 40 is ensured.
Optionally, the polish rod 100 is a two-stage polish rod, when steam injection operation is performed into the first oil pipe 20, the rotor of the bimetallic screw pump 40, the sucker rod 80 and the polish rod 100 are lifted, the first-stage polish rod of the two-stage polish rod is dismounted, at this time, a steam injection channel is formed inside the stator of the bimetallic screw pump 40, reliability of steam injection into the first oil pipe 20 is ensured, after the steam injection operation is completed, when oil pumping operation is started, the first-stage polish rod and the second-stage polish rod are simultaneously connected, the polish rod 100, the sucker rod 80 and the rotor are lowered, and when the rotor is lowered in place, the lifting operation is performed.
Optionally, the heavy oil injection and production system further comprises a limiting device, the limiting device is connected with one end of the stator, which is far away from the first oil pipe 20, and the limiting device limits the rotor when the rotor is lowered into the stator. Thus, the lowering reliability of the rotor is ensured.
As shown in fig. 2, the heavy oil injection and production system further includes a tail pipe 110, a first end of the tail pipe 110 is connected to an end of the limiting device far away from the stator, and a second end of the tail pipe 110 is connected to the plug. Thus, the tail pipe 110 is arranged at the downstream of the bimetallic screw pump 40 to play a role in sand settling and foreign matter, and can prevent the oil flow from carrying impurities such as sand grains and the like to directly enter the bimetallic screw pump 40 to cause pump blockage; in addition, the plug functions to prevent leakage of first oil pipe 20.
Alternatively, the tail pipe 110 may be lowered into the horizontal section through the screen hanger 71 at the end, or may be positioned on the side of the screen hanger 71 remote from the screen 70, although the tail pipe 110 may be lowered to different depths as desired to facilitate flexibility in production.
Alternatively, the stator of the bimetallic screw pump 40 is threadedly connected to the second end of the first oil pipe 20, and the stator is threadedly connected to the limiting device, which is threadedly connected to the tail pipe 110, and the tail pipe 110 is threadedly connected to the plug.
As shown in fig. 2, the heavy oil injection and production system further includes a plurality of sucker rod centralizers 120, the sucker rod 80 includes a plurality of connected sucker rod sections, and at least one sucker rod centralizer 120 is disposed between two adjacent sucker rod sections. Thus, the sucker rod centralizer 120 acts to centralize the sucker rod section.
It should be noted that, in the present application, considering that the transition section of the horizontal well is arc-shaped, the sucker rod centralizer 120 is lowered to the transition section with higher curvature of the well bore according to the well bore track, so as to prevent each sucker rod section of the sucker rod 80 located at the transition section from breaking after eccentric wear, and ensure the connection reliability of each sucker rod section; in addition, sucker rod centralizer 120 adopts the slidingtype centralizer, and sucker rod centralizer 120's both ends all with sucker rod section threaded connection, ensure the reliability and the convenience of being connected of sucker rod centralizer 120 and sucker rod section.
As shown in fig. 2, the heavy oil injection and production system further includes a display device 130, the display device 130 is disposed on the ground, the test tube 50 passes through the dual thermal production wellhead 10 and is connected to the display device 130, and the display device 130 is used for providing temperature information monitored by the test tube 50. In this way, it is ensured that the display device 130 can feed back the temperature information monitored by the test tube 50 to the operator in time, thereby ensuring that the operator can obtain the downhole temperature information in time.
In the present application, the diameter of the well casing 60 is (9+5/8) in, the diameter of the screen 70 is 7in or (6+5/8) in, the diameter of the first tubing 20 is (3+ 1/2-3.5) in, the diameter of the second tubing 30 is (2+3/8) in, and the diameter of the test tube 50 is (9+5/8) in
The diameter of sucker rod 80 is 1in, and the diameter of polished rod 100 is 1.5in, and polished rod 100 includes first order polished rod and second level polished rod, and wherein, the length of first order polished rod is 8m, and the length of second level polished rod is 3m, and the second end of first order polished rod is connected with the first end of second level polished rod, and the first end of first order polished rodOne end of the second-stage polished rod passes through the double-pipe thermal recovery wellhead device 10 to be connected with the screw pump driving device 90, and the second end of the second-stage polished rod is connected with the second end of the sucker rod 80.
In the present application, the diameters are outer diameters, and the in is an inch.
The thickened oil injection and production system can be suitable for steam huff-puff production horizontal wells, steam flooding production horizontal wells and SAGD production horizontal wells.
When the heavy oil injection and production system is used for a steam huff and puff production horizontal well, when steam injection operation is carried out in the steam huff and puff production horizontal well, the polish rod 100 in the first oil pipe 20 is lifted up, the first-stage polish rod in the two-stage polish rod is dismounted, the rotor of the bimetallic screw pump 40 is lifted up from the stator, steam is injected from the first oil pipe 20 and the second oil pipe 30 simultaneously, when oil pumping operation is carried out after the steam injection operation is finished, the first-stage polish rod and the second-stage polish rod of the two-stage polish rod are connected, the polish rod 100, the sucker rod 80 and the rotor of the bimetallic screw pump 40 are lowered down, and the pumping production can be started until the rotor is lowered into the stator.
When the thickened oil injection and production system is used for steam-driven production of a horizontal well, the bimetallic screw pump 40 is lifted, the test tube 50 is placed in the second oil pipe 30, the test tube 50 can measure the temperature profile of the shaft, and according to the measured temperature profile, if the temperature of the rear end of the horizontal section is lower than 100 ℃, steam is continuously injected into the second oil pipe 30 for heating; if the temperature distribution of the horizontal section is not uniform, when the temperature difference is higher than 50 ℃, adjusting the steam injection amount of the steam injection vertical wells around the steam flooding production horizontal well or closing the vertical wells which generate steam channeling with the production horizontal well.
When the thickened oil injection and production system is used for an SAGD production horizontal well, in an SAGD circulating preheating stage, a polished rod 100 in a first oil pipe 20 is lifted, a first-stage polished rod in two-stage polished rods is dismounted, a rotor of a bimetallic screw pump 40 is lifted from a stator, steam is injected into a second oil pipe 30, and the steam returns out from the first oil pipe 20 to heat an oil reservoir around the horizontal section; when oil pumping operation is performed after steam injection operation is completed, the first-stage polished rod and the second-stage polished rod of the two-stage polished rods are connected, the polished rod 100, the sucker rod 80 and the rotor of the bimetallic screw pump 40 are lowered until the rotor is lowered into the stator, pumping starting production can be performed, the test tube 50 is lowered into the second oil tube 30, and the liquid production amount of the production horizontal well or the steam injection parameters of the steam injection horizontal well are adjusted according to the temperature profile.
It should be noted that the viscous crude injection and production system that this application provided can realize the steam injection, oil recovery, the test, the companion's heat adopts the completion of same set of tubular column, need not to change the tubular column operation, under the condition of not installing the oil pipe anchor, bimetal screw pump 40 goes into down to the horizontal segment and recovers oil, the flow resistance that the extraction liquid went into the pump is less, be favorable to promoting the efficiency of oil recovery, because first oil pipe 20 is outer thickened oil pipe, supporting sucker rod centralizer 120 that uses simultaneously, ensure the operational reliability of viscous crude injection and production system, furthermore, the viscous crude injection and production system be located subaerial double-barrelled thermal recovery wellhead assembly 10 simple structure, be convenient for the scale is used, realize the high-efficient exploitation to ultra-shallow viscous crude oil reservoir.
It should be noted that the thickened oil injection and production system provided by the application can perform steam injection operation by lifting the rotor from the stator during steam injection operation, and can perform lifting operation directly by lowering the rotor without extra workover operation during lifting production, so that damage to an underground thermal field is avoided, the thermal efficiency is high, and the production time at high temperature is long.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an", and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an", and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein.
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 (11)
1. The utility model provides a viscous crude injection and production system which for carry out viscous crude exploitation to horizontal well, include:
the double-pipe thermal recovery wellhead device (10) is arranged outside the well barrel of the horizontal well and is positioned on the ground;
a first oil pipe (20), wherein the first oil pipe (20) is positioned in a shaft of the horizontal well, a first end of the first oil pipe (20) is communicated with the double-pipe thermal recovery wellhead device (10), and a second end of the first oil pipe (20) extends along the extension direction of the horizontal well;
a second oil pipe (30), wherein the second oil pipe (30) is positioned in the shaft of the horizontal well and is arranged adjacent to the first oil pipe (20), a first end of the second oil pipe (30) is communicated with the double-pipe thermal recovery wellhead device (10), and a second end of the second oil pipe (30) extends along the extension direction of the horizontal well;
before oil pumping operation is carried out, steam is injected into at least one of the first oil pipe (20) and the second oil pipe (30) so that the steam is diffused to an oil layer, after the steam is diffused, a bimetallic screw pump (40) and a sucker rod (80) are placed into one of the first oil pipe (20) and the second oil pipe (30), the bimetallic screw pump (40) and the sucker rod (80) are connected to carry out oil pumping operation, and a test tube (50) is placed into the other one of the first oil pipe (20) and the second oil pipe (30) so that the downhole temperature of the horizontal well can be monitored in real time.
2. The heavy oil injection and production system according to claim 1, wherein the horizontal well comprises a first well section, a transition section and a second well section which are connected in sequence in a direction away from the ground, the second well section extends along the horizontal direction, and the heavy oil injection and production system further comprises:
an oil well casing (60), the oil well casing (60) being arranged in the wellbore of the horizontal well and extending from the first interval to the transition section, the first oil pipe (20) being located in the oil well casing (60), a portion of the second oil pipe (30) being located in the oil well casing (60), a first end of the oil well casing (60) being connected to a housing of the dual thermal recovery wellhead assembly (10);
a screen (70), said screen (70) being disposed in the wellbore of the horizontal well at the second interval, said screen (70) being connected to the second end of the well casing (60) by a screen hanger (71), the second end of the second tubing (30) extending out of the well casing (60) and into said screen (70);
the first oil pipe (20) is used for lowering the bimetallic screw pump (40), and the second oil pipe (30) is used for lowering the test pipe (50).
3. The heavy oil injection and production system according to claim 1, wherein the first oil pipe (20) is parallel to the second oil pipe (30).
4. The heavy oil injection and production system according to claim 2, wherein the second end of the first oil pipe (20) is connected to a stator of the bimetallic screw pump (40), the sucker rod (80) is located in the first oil pipe (20), the first end of the sucker rod (80) is connected to a rotor of the bimetallic screw pump (40), and the sucker rod (80) and the rotor are lifted to open a steam injection passage before injecting steam into the first oil pipe (20).
5. The heavy oil injection and production system according to claim 4, further comprising:
the screw pump driving device (90) is arranged on the connection of the double-pipe thermal recovery wellhead device (10) and is in driving connection with the bimetallic screw pump (40);
the second end of the sucker rod (80) is connected with the first end of the polish rod (100), and the second end of the polish rod (100) penetrates through the double-pipe thermal recovery wellhead device (10) to be connected with the screw pump driving device (90).
6. The thick oil injection and production system according to claim 4, further comprising:
the limiting device is connected with one end, far away from the first oil pipe (20), of the stator, and when the rotor is lowered into the stator, the limiting device limits the rotor.
7. The heavy oil injection and production system according to claim 6, further comprising:
the first end of the tail pipe (110) is connected with one end, far away from the stator, of the limiting device, and the second end of the tail pipe (110) is connected with a plug.
8. The heavy oil injection and production system according to claim 4, further comprising a plurality of sucker rod centralizers (120), wherein the sucker rod (80) comprises a plurality of connected sucker rod sections, and at least one sucker rod centralizer (120) is arranged between two adjacent sucker rod sections.
9. The thick oil injection and production system according to claim 1, further comprising:
the display device (130) is arranged on the ground, the test tube (50) penetrates through the double-tube thermal recovery wellhead device (10) and is connected with the display device (130), and the display device (130) is used for providing temperature information monitored by the test tube (50).
10. A process method for producing a horizontal well is used for carrying out thickened oil recovery on the horizontal well through a thickened oil injection and recovery system, and is characterized in that the thickened oil injection and recovery system is the thickened oil injection and recovery system according to any one of claims 1 to 9, and the process method comprises the following steps:
injecting steam into at least one of the first tubing (20) and the second tubing (30) to diffuse the steam to the formation;
and after the steam finishes the diffusion operation, lowering a bimetallic screw pump (40) and a sucker rod (80) into one of the first oil pipe (20) and the second oil pipe (30), connecting the bimetallic screw pump (40) with the sucker rod (80) to perform oil pumping operation, and lowering a test tube (50) into the other one of the first oil pipe (20) and the second oil pipe (30) to monitor the downhole temperature of the horizontal well in real time.
11. The process of claim 10, further comprising the steps of:
before injecting steam into at least one of the first oil pipe (20) and the second oil pipe (30), a sucker rod (80) in the first oil pipe (20) and a rotor of the bimetallic screw pump (40) are lifted to open a steam injection passage.
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| US4460044A (en) * | 1982-08-31 | 1984-07-17 | Chevron Research Company | Advancing heated annulus steam drive |
| US20130213653A1 (en) * | 2012-02-22 | 2013-08-22 | Conocophillips Company | Producer snorkel or injector toe-dip to accelerate communication between sagd producer and injector |
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