CN204627573U - String equipment for SAGD bi-horizontal well - Google Patents

Abstract

The utility model provides a tubular column equipment of two horizontal wells of SAGD, tubular column equipment are used for the oil recovery method's of two horizontal wells of SAGD lift technology, and two horizontal wells of SAGD include steam injection well and production well, and tubular column equipment sets up in the production well, and tubular column equipment includes: the casing comprises a casing vertical section, a casing transition section and a casing horizontal section which are sequentially connected, and the upper end of the casing vertical section is connected to a wellhead of the production well; one end of the sieve tube is connected in the horizontal section of the sleeve, and the sieve tube extends along the horizontal direction; the long pipe and the short pipe are arranged in the sleeve in parallel, the long pipe and the short pipe both extend into the sieve pipe, the short pipe is arranged above the long pipe, the long pipe protrudes out of the short pipe in the horizontal direction, and oil reservoir fluid is lifted to the ground through the long pipe and/or the short pipe. The technical scheme of the utility model the process condition that lifts of having solved among the prior art SAGD shallow oil exploitation is complicated, the limited problem of equipment utilization.

Description

String equipment for SAGD bi-horizontal well

technical field

The utility model relates to the technical field of SAGD ultra-heavy oil exploitation, in particular to a pipe string device for a SAGD double-horizontal well.

Background technique

SAGD (Steam Assisted Gravity Drainage) technology is used for super heavy oil recovery. During the oil production phase, the oil-water mixture in the production well needs to be lifted to the surface. During the lifting process, there are problems such as high downhole fluid temperature, large liquid volume, and possible hydrogen sulfide corrosion downhole.

For the lifting process of SAGD shallow oil recovery, gas lift is used in the prior art to complete the lifting of reservoir fluid. Specifically, natural gas is injected into production wells and dilutes the oil-water mixture and reduces its density, which is more conducive to the lifting of reservoir fluids. However, the above method needs to have sufficient natural gas source at the mining site. If the gas source required for production cannot be provided, the above scheme is not feasible.

In order to solve the problems in the above-mentioned technical solutions, electric submersible pumps are used in the prior art to realize fluid lift in reservoirs. However, due to the high temperature of the downhole fluid, the electric submersible pump is not suitable for working for a long time under high temperature conditions. Therefore, the electric submersible pump needs to be checked and repaired frequently, which will affect the production efficiency and increase the cost.

In order to solve the problems existing in the lifting process of the electric submersible pump, a rod pump is used in the prior art to complete the lifting of reservoir fluid. Combined with the general situation in China, rod pumps are generally used to realize the lifting process for shallow SAGD mining. However, the rod pump lifting process has certain requirements for wellbore trajectory and reservoir depth, especially in shallow reservoirs. When a large-displacement oil well pump is lowered into the wellbore, the eccentric wear of the sucker rod string is prone to occur. Moreover, the pressure difference at the front end of the production process is large, and the producing degree of the rear end of the horizontal section of the production well is reduced. In addition, the transition from the cycle preheating stage to the oil production stage in the process of SAGD oil production requires the replacement of a large number of pipeline equipment for production wells, which increases the complexity of the process.

Therefore, the lifting process for SAGD shallow oil recovery in the above-mentioned prior art has the problems of complicated process conditions and limited use of equipment.

Utility model content

The main purpose of the utility model is to provide a pipe string equipment for SAGD double-horizontal wells to solve the problems in the prior art that the lifting process of SAGD shallow oil exploitation is complicated and the use of the equipment is limited.

In order to achieve the above object, according to one aspect of the utility model, a kind of string equipment of SAGD double horizontal well is provided. Well and production well, the string equipment is set in the production well, and the string equipment includes: casing, including the casing vertical section, the casing transition section and the casing horizontal section connected in sequence, and the upper end of the casing vertical section is connected to the production well The wellhead; the screen, one end of the screen is connected in the horizontal section of the casing, and the screen extends in the horizontal direction; the long pipe and the short pipe are arranged in parallel in the casing, and both the long pipe and the short pipe extend to the screen Among them, the short pipe is arranged above the long pipe, and the long pipe protrudes from the short pipe in the horizontal direction, wherein the reservoir fluid is lifted to the surface through the long pipe and/or the short pipe.

Further, a screen hanger is arranged in the horizontal section of the casing, and the screen is connected to the casing through the screen hanger.

Further, guide shoes are provided at the ends of the long pipe and the short pipe inside the screen tube, and through holes are opened at the ends of the guide shoes.

Further, the long pipe includes a first long pipe and a second long pipe connected in sequence, the second long pipe is located below the first long pipe, and the junction of the first long pipe and the second long pipe is located in the casing transition section, The diameter of the first long tube is larger than the diameter of the second long tube.

Further, the first long pipe and the second long pipe are connected through a conversion short-circuit device.

Further, the pipe string equipment also includes control equipment, which is set on the ground and connected to the wellhead. The long pipe and the short pipe are respectively connected to the control equipment through the long pipe hanger and the short pipe hanger. Tube opening or closing.

Further, the pipe string equipment also includes a test tube, the test tube is passed through the long tube, and the two ends of the test tube are respectively flush with the two ends of the long tube.

Applying the technical scheme of the utility model, the pipe string equipment is used for the lifting process of the oil recovery method of the SAGD double-horizontal well. In the lifting process, the reservoir fluid can pass through the long pipe 30 and/or the short pipe 40 of the string equipment only if the bottom hole pressure in the production well is greater than the production resistance that the reservoir fluid needs to overcome when it is lifted to the surface Lift to the ground. The lifting process does not need to replace oil pumping equipment in the production well, and is less affected by the environment, and the process is simple. Therefore, the technical solution of the utility model effectively solves the problems in the prior art that the lifting process of SAGD shallow oil exploitation is complicated and the use of equipment is limited. .

Description of drawings

The accompanying drawings constituting a part of this application are used to provide a further understanding of the utility model, and the schematic embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute improper limitations to the utility model. In the attached picture:

Fig. 1 shows the structural representation of the embodiment of the string equipment of SAGD double horizontal well according to the utility model;

Fig. 2 shows a schematic flow chart of the lifting process of the pipe string equipment using the SAGD dual-horizontal well of the present invention.

Wherein, the above-mentioned accompanying drawings include the following reference signs:

10. Casing; 11. Vertical section of casing; 12. Transition section of casing; 13. Horizontal section of casing; 131. Screen hanger; 20. Screen; 30. Long pipe; 31. First long pipe; 32. The second long tube; 40. Short tube; 50. Boots; 60. Switching and shorting device; 70. Control equipment; 80. Long tube hanger; 90. Short tube hanger; 100. Test tube.

Detailed ways

It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The utility model will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

In the prior art, for the lifting process of SAGD oil production technology, especially for shallow oil production, it is necessary to take out all the string equipment in the production well and replace a large number of pumping equipment when transferring from the cycle preheating stage to the production stage . Moreover, due to the particularity of shallow oil exploitation and the geological conditions of our country, oil pumping equipment such as electric submersible pumps, rod pumps, etc., all have the problem of not being able to work stably for a long time, and the equipment is easily damaged, which seriously restricts the production of oil wells and increases workover operations. cost.

Aiming at the problems in the above-mentioned prior art, the inventor proposed for the first time that in the lifting process of SAGD oil production technology, the well group equipment in the production well should be retained when the cycle preheating stage is transferred to the production stage, and the steam injection well can be properly raised Bottom hole pressure is used to realize spontaneous injection production of reservoir fluid. Since no other oil pumping equipment is needed, the SAGD oil recovery technology of the present application greatly simplifies the process steps of the lifting process, and reduces the limitation of the lifting process by the environment and equipment.

As shown in FIG. 1 , the pipe string equipment in this embodiment includes a casing 10 , a screen pipe 20 , a long pipe 30 and a short pipe 40 . Casing 10 includes casing vertical section 11, casing transition section 12 and casing horizontal section 13, the upper end of casing vertical section 11 is connected to the wellhead of production well, casing vertical section 11, casing transition section 12 and casing horizontal section Segments 13 are connected sequentially. One end of the screen pipe 20 is connected in the casing horizontal section 13, and the screen pipe 20 extends along the horizontal direction. The long pipe 30 and the short pipe 40 are arranged in parallel in the casing pipe 10 and the screen pipe 20, the short pipe 40 is arranged above the long pipe 30, and the horizontal extension distance of the long pipe 30 is greater than the horizontal extension distance of the short pipe 40, wherein , the pipe string equipment is used in the lifting process of the oil production method of SAGD double horizontal well. The SAGD bi-horizontal well includes a steam injection well and a production well, and the string equipment is set in the production well. And the downhole reservoir fluid is lifted to the surface through the long pipe 30 and/or the short pipe 40 .

In this embodiment, the casing transition section is the casing deviated well section.

Applying the technical solution of this embodiment, the pipe string equipment is used for the lifting process of the oil production method of the SAGD double-horizontal well. In the lifting process, the reservoir fluid can be lifted through the long pipe 30 and/or the short pipe 40 of the string equipment only by making the bottom hole pressure in the production well greater than the production resistance that the downhole fluid needs to overcome when it is lifted to the surface. raised to the ground. The lifting process does not need to replace oil pumping equipment in the production well, and is less affected by the environment, and the process is simple. Therefore, the technical solution of this embodiment effectively solves the problems in the prior art that the lifting process of SAGD shallow oil recovery is complicated and the use of equipment is limited.

As shown in FIG. 1 , in the technical solution of this embodiment, a screen hanger 131 is provided in the casing horizontal section 13 , and the screen 20 is connected to the casing 10 through the screen hanger 131 . The screen pipe hanger 131 can make the screen pipe 20 and the casing pipe 10 more tightly connected, prevent the screen pipe 20 from being damaged during operation, and increase the service life of the equipment.

As shown in FIG. 1 , in the technical solution of this embodiment, guide shoes 50 are provided at the ends of the horizontally extending parts of the long tube 30 and the short tube 40 . The guide shoes 50 play a guiding role in the installation process of the long pipe 30 and the short pipe 40, making it easier for the long pipe 30 and the short pipe 40 to be lowered into the production well, and prevent the long pipe 30 and the short pipe 40 from ending up in the installation process. Department is worn. In order to facilitate downhole fluid to flow into the long pipe 30 or the short pipe 40, the end of the guide shoe 50 is provided with a through hole.

As shown in FIG. 1 , in the technical solution of this embodiment, since the space inside the screen pipe 20 is relatively narrow, the long pipe 30 includes a first long pipe 31 and a second long pipe 32 . Specifically: the first long pipe 31 extends from the wellhead of the production well to the casing transition section 12, the free end of the first long pipe 31 located in the casing transition section 12 is connected to one end of the second long pipe 32, and the second long pipe 31 is connected to one end of the second long pipe 32. The pipe 32 extends into the screen pipe 20 , the diameter of the first long pipe 31 is greater than that of the second long pipe 32 , and the first long pipe 31 and the second long pipe 32 are connected by a conversion short-circuit device 60 . Of course, the connection method between the first long pipe 31 and the second long pipe 32 is not limited to the use of the conversion and shorting device 60, and other connection methods can be used, such as between the first long pipe 31 and the second long pipe 32 Set the cone section, and the specific connection method is determined according to the actual work needs.

As shown in Figure 1, in the technical solution of this embodiment, the pipe string equipment also includes a control device 70, the control device 70 is arranged on the ground and connected to the wellhead, the long pipe 30 and the short pipe 40 pass through the long pipe hanger 80 and the The short pipe hanger 90 is connected to the control device 70, and the control device 70 controls the opening or closing of the long pipe 30 and the short pipe 40.

By controlling the opening or closing of the long pipe 30 and the short pipe 40 by the control device 70, the pipe string equipment in this embodiment has three oil production methods, including long pipe 30 oil production, short pipe 40 oil production, and long pipe 30 and short pipe 40 simultaneous oil production. . Specifically, the long pipe 30 is used for the production of reservoir fluids in the middle and rear stages of the production well, and the short pipe 40 is used for the production of oil reservoir fluids in the middle and front stages of the production well. Which of the above-mentioned oil production methods is used depends on the degree of connectivity of the dual-horizontal well: in the case of a uniform degree of connectivity in the dual-horizontal well, use the long pipe 30 and the short pipe 40 to simultaneously produce oil; If the degree of connection is poor, the long pipe 30 is used for oil production; if the connection degree of the rear section of the bi-horizontal well is good, and the connection degree of the front section is poor, the short pipe 40 is used for oil production.

As shown in Figure 1, in the technical solution of this embodiment, the pipe string equipment also includes a test tube 100, the test tube 100 is installed in the long tube 30, and the two ends of the test tube 100 are respectively parallel to the two ends of the long tube 30. together. The test tube 100 is used to measure various parameters of the production well, such as downhole temperature, pressure detection and the like. The data measured by the test tube 100 can be used as a basis for SAGD production analysis and parameter regulation.

In this embodiment, the lifting process may require production wells to stop steam injection or reservoir fluid production due to equipment maintenance or equipment failure. The above operations may lead to a decrease in the local downhole temperature of the production well, making it difficult for the reservoir fluid to be lifted to the surface during production recovery. At this time, a small amount of steam can be injected into the production well through long or short pipes to heat the pipe string equipment, and then restart the lifting process to lift the reservoir fluid to the surface.

The lifting process performed by using the pipe string equipment of this embodiment will be described in detail below.

As shown in Figure 2, the lifting process carried out by using the pipe string equipment of this embodiment includes: retaining the pipe string equipment in the production well when transferring from the circulation preheating stage to the production stage; increasing the bottom hole pressure of the steam injection well so that The downhole fluid in the production well is lifted to the surface through the string equipment.

In the cycle preheating stage, both the steam injection well and the production well are injected into circulation, and the steam injection well and the production well are connected thermally and hydraulically. When transferring from the cycle preheating stage to the production stage, the steam injection wells will continue to inject steam, and the production well group equipment will remain unchanged, and the steam injection will be stopped to start production. There are three ways of production, including: separate production of long tubes, separate production of short tubes, and simultaneous production of long tubes and short tubes. The lifting process of the production well section is specifically to lift the downhole fluid from the ground to the surface through the first pipe string equipment in the production well, so as to realize the recovery of reservoir fluid.

Of course, the method of increasing the bottom hole pressure of the production well is not limited to increasing the steam injection pressure of the steam injection well. Since the steam injection well and the production well have been connected in the production stage, as long as the bottom hole pressure of the steam injection well can be increased, the bottom hole pressure of the production well can be increased. The specific operation method can be determined according to the actual work needs.

In the above lifting process, increasing the bottom hole pressure of the steam injection well includes increasing the steam injection pressure of the steam injection well to increase the bottom hole pressure of the production well. After the circulation preheating stage, the production well and the steam injection well have been connected, so when the steam injection pressure of the steam injection well is increased, the bottom hole pressure of the production well will increase in pressure linkage. Therefore, by increasing the steam injection pressure of the steam injection well, the purpose of increasing the bottom hole pressure of the production well can be achieved.

In order to realize the self-spray production of reservoir fluid. The bottom hole pressure of the production well must be greater than the production resistance of the reservoir fluid, so that the reservoir fluid is lifted from the bottom of the production well to the surface through the pipe string equipment. The production resistance is the resistance to be overcome when the reservoir fluid is lifted to the surface.

Specifically, the production resistance includes the frictional resistance between the reservoir fluid and the pipe string equipment, the gravity of the fluid, and the internal pressure of the control equipment. Wherein, the control equipment is connected with the pipe string equipment in the production well, and controls the opening or closing of the pipe string equipment. Therefore, the internal pressure in the surface equipment may also be transmitted to the production downhole through the pipe string equipment, and form production resistance.

The above descriptions are only preferred embodiments of the utility model, and are not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present utility model shall be included in the protection scope of the present utility model.

Claims (7)

1. the column apparatus of a SAGD dual horizontal well, it is characterized in that, described column apparatus is used for the lifting technology of the oil production method of SAGD dual horizontal well, and described SAGD dual horizontal well comprises steam injection well and producing well, described column apparatus is arranged in described producing well, and described column apparatus comprises:

Sleeve pipe (10), comprise the sleeve pipe vertical section (11), sleeve pipe changeover portion (12) and the sleeve pipe horizontal segment (13) that connect successively, the upper end of described sleeve pipe vertical section (11) is connected to the well head of described producing well;

Screen casing (20), one end of described screen casing (20) is connected in described sleeve pipe horizontal segment (13), and described screen casing (20) extends in the horizontal direction;

Long tube (30) and short tube (40), parallel is arranged in described sleeve pipe (10), and described long tube (30) and described short tube (40) all extend in described screen casing, described short tube (40) is arranged on the top of described long tube (30), described long tube (30) protrudes from described short tube (40) in described horizontal direction

Wherein, reservoir fluid is lifted to ground by described long tube (30) and/or described short tube (40).

2. column apparatus according to claim 1, it is characterized in that, be provided with screen pipe hanger (131) in described sleeve pipe horizontal segment (13), described screen casing (20) is connected on described sleeve pipe (10) by described screen pipe hanger (131).

3. column apparatus according to claim 1, it is characterized in that, the end that described long tube (30) and described short tube (40) are positioned at described screen casing (20) is provided with guide shoe (50), and the end opens of described guide shoe (50) has through hole.

4. column apparatus according to claim 1, it is characterized in that, described long tube (30) comprises the first long tube (31) and the second long tube (32) that connect successively, described second long tube (32) is positioned at the below of described first long tube (31), the junction of described first long tube (31) and described second long tube (32) is positioned at described sleeve pipe changeover portion (12), and the diameter of described first long tube (31) is greater than the diameter of described second long tube (32).

5. column apparatus according to claim 4, is characterized in that, is connected between described first long tube (31) and described second long tube (32) by cross-over sub device (60).

6. column apparatus according to claim 1, it is characterized in that, described column apparatus also comprises control appliance (70), described control appliance (70) is arranged on ground and is connected with described well head, described long tube (30) and described short tube (40) are connected on described control appliance (70) respectively by long tube pipe hanger (80) and short tube pipe hanger (90), and described control appliance (70) controls opening or cutting out of described long tube (30) and described short tube (40).

7. column apparatus according to claim 1, it is characterized in that, described column apparatus also comprises testing tube (100), described testing tube (100) is arranged in described long tube (30), and the two ends of described testing tube (100) are concordant with the two ends of described long tube (30) respectively.