An injection-production integrated device and method thereof

Abstract

The present invention discloses an integrated injection and production device and method thereof, belonging to the technical field of oil production. It comprises a pipe column, the top of the pipe column is a wellhead, a wellhead connection device is arranged on the top of the pipe column, a blowout preventer is arranged above the wellhead connection device, a blowout preventer is arranged on the top of the blowout preventer, a sealing box is arranged on the top of the blowout preventer, a tool string is movably arranged in the blowout preventer, the top of the tool string is plugged or wound to connect one end of a flexible continuous sucker rod, the flexible continuous sucker rod passes through the sealing box and is connected to the lifting and bailing oil production machine, a production pipeline and an injection pipeline are connected to the wellhead connection device, and a production valve and an injection valve are arranged on the production pipeline and the injection pipeline, respectively. The present invention only needs to control the position of the valve and the pump, without changing the wellhead and installing and disassembling the sucker rod, and without lifting or replacing the pipe column and the pump, the conversion of the two sets of injection and production processes of a single well can be realized, so that the integrated development of injection and production can further save energy and reduce consumption, be safe and environmentally friendly, and improve quality and efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of petroleum extraction, in particular to an injection-production integrated device and a method thereof. Background Art

[0002] During oil extraction, there are some low-yield and low-liquid wells with insufficient formation energy and cannot rely on water wells to supplement formation energy. Single-well injection (water, gas) production and huff and puff development is adopted; heavy oil steam huff and puff production wells also adopt single-well injection and production huff and puff development; gas injection huff and puff production wells also adopt single-well injection and production huff and puff development; wells that use different injection or production policies at different layers of the same well are also the same well injection and production huff and puff development. At present, single-well huff and puff is an important production method for oil and gas extraction. In the early single-well huff and puff production process, it is necessary to install injection equipment and carry out the injection process. After the injection is completed, the well is shut down. After self-flowing production or self-flowing production is impossible, the injection equipment is removed, and then the production equipment needs to be installed again for oil production. In this way, two trips of tubing operations are required to complete this process. The construction process is relatively cumbersome, the operation time is long, the energy or heat loss is large, the high pressure in the well has safety hazards, and the cost is high.

[0003] In order to further improve quality and efficiency, in terms of reducing operation processes and practices, and reducing energy consumption and costs of injection-production conversion, a lot of research has been done on the methods and devices for the integrated production of injection and production for many years. However, the current integrated methods and supporting devices for injection and production cannot achieve seamless, closed, and unimpeded connection between injection and production, and the injection-production conversion operation is still not simplified enough. The current integrated injection and production technology is not mature and perfect enough, and the integrated production method of injection and production still needs to be optimized and developed. The current integrated injection and production technology has its inherent problems: there is an oil production pump in the wellbore, which leads to the main problems that the integration of injection and production will inevitably face: either the complexity of the oil production pump needs to be increased, which will reduce the performance or reliability of the oil production pump, and will also hinder the flow of fluid during the injection process, or there are hidden dangers of foreign matter entering the pump during the injection process, causing pump jams and corrosion; or the pump needs to be pulled out, which increases the complexity of the operation procedures, increases the risk of overflow, increases costs, wastes time, and consumes energy. Although the former theoretically reduces the demand for operations, the complexity of the actual downhole fluid environment and reservoir geology determines that it usually requires operational measures from other aspects (such as increasing the cost of the pump and the probability of pump inspection), and even increases operational risks. Therefore, it is necessary to provide an injection-production integrated device and method thereof. Summary of the invention

[0004] The object of the present invention is to provide an injection-production integrated device and method thereof to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] An injection-production integrated device comprises a pipe string, the top of the pipe string is a wellhead, a wellhead connecting device is arranged on the top of the pipe string, a blowout preventer is arranged above the wellhead connecting device, a blowout preventer is arranged on the top of the blowout preventer, a sealing box is arranged on the top of the blowout preventer, a tool string is movably arranged in the blowout preventer, the tool string enters the pipe string after the blowout preventer is turned on, the tool string cooperates with the pipe string, the top of the tool string is plugged in or wound with one end of a flexible continuous sucker rod, the flexible continuous sucker rod passes through the sealing box and is connected to a bailing oil production machine, a production pipeline and an injection pipeline are connected to the wellhead connecting device, and a production valve and an injection valve are respectively arranged on the production pipeline and the injection pipeline.

[0007] As a further solution of the present invention: the tool string includes a drawer, a weighted rod and a wax and scale remover, the top of the drawer is plugged in or wrapped around one end of a flexible continuous sucker rod, the bottom of the drawer is provided with a weighted rod, and the bottom of the weighted rod is provided with a wax and scale remover.

[0008] As a further solution of the present invention: the tubing string includes a casing string, the drawer cooperates with the casing string, the wellhead connection device includes a casing head, a main valve and a casing four-way, the top of the casing string is connected to the casing head, a casing four-way is arranged on the top of the casing head, a production pipeline and an injection pipeline are connected to the side channel of the casing four-way, a temperature and pressure measuring instrument is arranged on the side channel of the casing four-way, a main valve is arranged at the top of the casing four-way, and a blowout preventer is arranged at the top of the main valve.

[0009] As a further solution of the present invention: the tubing string includes an oil tubing string, a casing string is sleeved on the oil tubing string, the wellhead connecting device includes a casing head, a main valve, a casing four-way, a hanger and an oil tubing four-way, the bottom of the casing head is connected to the casing string, the top of the casing head is provided with a casing four-way, a temperature and pressure measuring instrument is provided on a side channel of the casing four-way, the top of the oil tubing string is connected to the oil tubing four-way through a hanger, the hanger is provided on the top of the casing four-way, the two side outlets of the oil tubing four-way are respectively connected to the production pipeline and the injection pipeline, the top of the oil tubing four-way is provided with a main valve, and the top of the main valve is provided with a blowout preventer.

[0010] As a further solution of the present invention: the oil bailing machine is a drum winch type device.

[0011] The present invention provides an injection-production integrated method, which comprises the following steps:

[0012] (1) Place the tool string in the blowout preventer, seal the top of the blowout preventer with a sealing box, and close the blowout preventer and production valve to seal;

[0013] (2) Open the injection valve and main valve, and the injection pipeline begins to inject fluid into the tubing string, starting the injection process;

[0014] (3) After the injection is completed, close the injection valve and the main valve, and continue to close and seal the production valve and blowout preventer to shut off the well.

[0015] (4) After the well is soaked, open the production valve and the main valve. If the formation energy is sufficient, start the blowdown production.

[0016] (5) If the formation energy is insufficient or the spraying cannot continue or the spraying speed slows down after a period of time, open the blowout preventer and the production valve, and the lifting and bailing oil production machine drives the flexible continuous sucker rod to control the pump to enter the pipe string and start the bailing production; this production process can adjust the downward distance of the pump within the length range of the flexible continuous sucker rod according to the liquid level position and the upper limit of the bailing amount, without being restricted by the liquid level.

[0017] (6) After the production cycle is over, the pump and other tools are pulled into the blowout preventer, the production valve and blowout preventer are closed, the main valve and injection valve are opened, injection begins, and a new injection-production cycle begins.

[0018] Compared with the prior art, the present invention has the following beneficial effects: (1) The present invention can realize the conversion of the two processes of injection and production of a single well by only controlling the position of the valve and the pump, without changing the wellhead and installing and disassembling the sucker rod, or lifting or replacing the tubing and pump; (2) The oil production characteristics of the lifting and bailing oil production machine, the flexible continuous sucker rod and the pump combination can realize the unimpeded flow of fluid in the tubing during the injection process, the injection process can be positive injection and reverse injection, and the production process can be liquid discharged from the oil pipe or the casing, thereby reducing the fluid resistance and eliminating the risk of pump jamming; eliminating the corrosion of the rod and pump during the injection process; (3) The injection and production cycle is sealed throughout, without leakage and waste of formation and injection fluid energy, no waste of injection and underground fluid, and no risk of overflow; (4) It is more adaptable to the large changes in bottom hole pressure before and after the production stage of throughput production. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a first structural schematic diagram of the injection process of an integrated injection-production equipment.

[0020] Figure 2 This is a second structural schematic diagram of the production process of an integrated injection and production equipment.

[0021] In the figure: 1. pipe string; 1-1. casing string; 1-2. tubing string; 2. wellhead connection device; 2-1. casing head; 2-2. main valve; 2-3. casing spool; 2-4. hanger; 2-5. tubing spool; 2-6. temperature and pressure measuring instrument; 3. blowout preventer; 4. blowout preventer; 5. sealing box; 6. tool string; 6-1. pump; 6-2. weighted rod; 6-3. wax remover and descaling device; 7. flexible continuous sucker rod; 8. lifting and salvaging machine; 9. production pipeline; 9-1. production valve; 10. injection pipeline; 10-1. injection valve. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] Example 1

[0024] like Figure 1 An injection-production integrated device includes a tubing string 1, the top of the tubing string 1 being a wellhead, a wellhead connecting device 2 being arranged on the top of the tubing string 1, a blowout preventer 3 being arranged above the wellhead connecting device 2, a blowout preventer 4 being arranged on the top of the blowout preventer 3, a sealing box 5 being arranged on the top of the blowout preventer 4, a tool string 6 being movably arranged in the blowout preventer 4, the tool string 6 entering into the tubing string 1 after the blowout preventer 3 is opened, the tool string 6 cooperates with the tubing string 1, the top of the tool string 6 is plugged in or wound around one end of a flexible continuous sucker rod 7, the flexible continuous sucker rod 7 passes through the sealing box 5 and is connected to a bailing oil production machine 8, a production pipeline 9 and an injection pipeline 10 are connected to the wellhead connecting device 2, and a production valve 9-1 and an injection valve 10-1 are respectively arranged on the production pipeline 9 and the injection pipeline 10.

[0025] Furthermore, the tool string 6 includes a puller 6-1, a weighted rod 6-2 and a wax remover and descaling device 6-3. The top of the puller 6-1 is plugged in or wound around one end of a flexible continuous sucker rod 7. The bottom of the puller 6-1 is provided with a weighted rod 6-2, and the bottom of the weighted rod 6-2 is provided with a wax remover and descaling device 6-3.

[0026] Furthermore, the tubular string 1 includes a casing string 1-1, a drawer 6-1 cooperates with the casing string 1-1, a wellhead connection device 2 includes a casing head 2-1, a main valve 2-2 and a casing spool 2-3, the top of the casing string 1-1 is connected to the casing head 2-1, a casing spool 2-3 is arranged on the top of the casing head 2-1, a side channel of the casing spool 2-3 is connected to a production pipeline 9 and an injection pipeline 10, a side channel of the casing spool 2-3 is arranged with a temperature and pressure measuring instrument 2-6, a main valve 2-2 is arranged at the top of the casing spool 2-3, and a blowout preventer 3 is arranged at the top of the main valve 2-2, so as to extract oil from the casing string 1-1.

[0027] In addition, the oil extraction machine 8 is a drum winch type device.

[0028] An injection-production integrated method comprises the following steps:

[0029] (1) Place the pump 6-1 into the lubricant preventer 4, seal the lubricant preventer 4 with a sealing box 5, and close the blowout preventer 3 and the production valve 9-1;

[0030] (2) The injection valve 10-1 and the main valve 2-2 are opened, and the injection pipeline 10 begins to inject fluid into the casing string 1-1, starting the injection process.

[0031] (3) After the injection is completed, close the injection valve 10-1 and the main valve 2-2, and continue to close and seal the production valve 9-1 and the blowout preventer 3 to shut off the well.

[0032] (4) After the well is soaked, open the production valve 9-1 and the main valve 2-2. If the formation energy is sufficient, start the blowdown production.

[0033] (5) If the formation energy is insufficient or the spraying cannot continue after a period of time or the spraying speed decreases after a period of time, the blowout preventer 3 and the production valve 9-1 are opened, and the oil extraction machine 8 drives the flexible continuous sucker rod 7 to control the pump 6-1 to enter the pipe string 1 and start the bailing production; in this production process, the downward distance of the pump 6-1 can be adjusted arbitrarily within the length range of the flexible continuous sucker rod 7 according to the liquid level position and the upper limit of the bailing amount, without being restricted by the liquid level.

[0034] (6) After the production cycle is completed, the pump 6-1 and other tools are pulled into the blowout preventer 4, the production valve 9-1 and the blowout preventer 3 are closed, the main valve 2-2 and the injection valve 10-1 are opened, and injection begins. A new injection-production cycle begins.

[0035] The present invention adopts flexible pumping pipe 7 and pump 6-1, and drum winch equipment controls flexible continuous pumping rod 7, so as to realize free movement of pump 6-1 from the bottom of casing string 1-1 to wellhead, and the injection process has no pump obstruction, no risk of pump jamming, and is easy to maintain and prevent jamming; blowout preventer 4 can be used as a storage short section for pump 6-1 and weighting rod 6-2, and in the process of continuous cycle of injection and production integration, fully enclosed injection and production alternating operation can be realized by switching control valve and pump 6-1 position, without the risk of overflowing well and wasting heat, so that the injection and production integration development can further save energy and reduce consumption, be safe and environmentally friendly, and improve quality and efficiency.

[0036] Example 2

[0037] like Figure 2 An injection-production integrated device includes a tubing string 1, the top of the tubing string 1 is a wellhead, a wellhead connecting device 2 is arranged on the top of the tubing string 1, a blowout preventer 3 is arranged above the wellhead connecting device 2, a blowout preventer 4 is arranged on the top of the blowout preventer 3, a sealing box 5 is arranged on the top of the blowout preventer 4, a tool string 6 is movably arranged in the blowout preventer 4, after the blowout preventer 3 is opened, the tool string 6 enters the tubing string 1, the tool string 6 cooperates with the tubing string 1, the top of the tool string 6 is plugged in or wound around one end of a flexible continuous sucker rod 7, the flexible continuous sucker rod 7 passes through the sealing box 5 and is connected to a bailing oil production machine 8, a production pipeline 9 and an injection pipeline 10 are connected to the wellhead connecting device 2, and a production valve 9-1 and an injection valve 10-1 are respectively arranged on the production pipeline 9 and the injection pipeline 10.

[0038] Furthermore, the tool string 6 includes a puller 6-1, a weighted rod 6-2 and a wax remover and descaling device 6-3. The top of the puller 6-1 is plugged in or wound around one end of a flexible continuous sucker rod 7. The bottom of the puller 6-1 is provided with a weighted rod 6-2, and the bottom of the weighted rod 6-2 is provided with a wax remover and descaling device 6-3.

[0039] Furthermore, the tubing string 1 includes an oil tubing string 1-2, on which a casing string 1-1 is sleeved, and a wellhead connection device 2 includes a casing head 2-1, a main valve 2-2, a casing spool 2-3, a hanger 2-4 and an oil tubing spool 2-5. The bottom of the casing head 2-1 is connected to the casing string 1-1, and a casing spool 2-3 is arranged on the top of the casing head 2-1. A temperature and pressure measuring instrument 2-6 is arranged on the side channel of the casing spool 2-3. The top of the oil tubing string 1-2 is connected to the oil tubing spool through a hanger 2-5, and the hanger 2-5 is arranged on the top of the casing spool 2-3. The outlets on both sides of the oil tubing spool 2-5 are respectively connected to the production pipeline 9 and the injection pipeline 10. The top of the oil tubing spool 2-5 is provided with a main valve 2-2, and the top of the main valve 2-2 is provided with a blowout preventer 3, so as to extract oil from the oil tubing string 1-2.

[0040] In addition, the oil extraction machine 8 is a drum winch type device.

[0041] An injection-production integrated method comprises the following steps:

[0042] (1) Place the tool string 6 into the lubricant preventer 4, seal the lubricant preventer 4 with a sealing box 5, and close the blowout preventer 3 and the production valve 9-1;

[0043] (2) The injection valve 10-1 and the main valve 2-2 are opened, and the injection pipeline 10 begins to inject fluid into the tubing string 1, starting the injection process.

[0044] (3) After the injection is completed, close the injection valve 10-1 and the main valve 2-2, and continue to close and seal the production valve 9-1 and the blowout preventer 3 to shut off the well.

[0045] (4) After the well is soaked, open the production valve 9-1 and the main valve 2-2. If the formation energy is sufficient, start the blowdown production.

[0046] (5) If the formation energy is insufficient or the spraying cannot continue after a period of time or the spraying speed decreases after a period of time, the blowout preventer 3 and the production valve 9-1 are opened, and the oil extraction machine 8 drives the flexible continuous sucker rod 7 to control the pump 6-1 to enter the pipe string 1 and start the bailing production; in this production process, the downward distance of the pump 6-1 can be adjusted arbitrarily within the length range of the flexible continuous sucker rod 7 according to the liquid level position and the upper limit of the bailing amount, without being restricted by the liquid level.

[0047] (6) After the production cycle is completed, the pump 6-1 and other tools are pulled into the blowout preventer 4, the production valve 9-1 and the blowout preventer 3 are closed, the main valve 2-2 and the injection valve 10-1 are opened, and injection begins. A new injection-production cycle begins.

[0048] The present invention adopts flexible pumping pipe 7 and pump 6-1, and the drum winch equipment controls the flexible continuous pumping rod 7 to realize the free movement of pump 6-1 from the bottom of the oil pipe string 1-2 to the wellhead. There is no pump obstruction in the injection process, no risk of pump jamming, and easy maintenance. The blowout preventer 4 can be used as a storage short section for the pump 6-1 and the weighting rod 6-2. In the process of continuous circulation of integrated injection and production, it only needs to switch the control valve and the position of the pump 6-1 to realize fully enclosed injection and production alternating operation, without the risk of overflowing the well and wasting heat, so that the integrated development of injection and production can further save energy and reduce consumption, be safe and environmentally friendly, and improve quality and efficiency.

[0049] It should be noted that the above embodiments are only specific and clear descriptions of the technical solutions and technical features of the present application. For those skilled in the art, solutions or features that belong to the prior art or common knowledge are not described in detail in the above embodiments.

[0050] In addition, the technical solutions of the present application are not limited to the above-mentioned embodiments. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. An integrated injection-production device, characterized in that: The invention comprises a pipe string (1), the top of the pipe string (1) is a wellhead, a wellhead connection device (2) is arranged on the top of the pipe string (1), a blowout preventer (3) is arranged above the wellhead connection device (2), a blowout preventer (4) is arranged on the top of the blowout preventer (3), a sealing box (5) is arranged on the top of the blowout preventer (4), a tool string (6) is movably arranged in the blowout preventer (4), after the blowout preventer (3) is opened, the tool string (6) enters the pipe string (1), the tool string (6) cooperates with the pipe string (1), the top of the tool string (6) is plugged or wound to connect one end of a flexible continuous sucker rod (7), the flexible continuous sucker rod (7) passes through the sealing box (5) and is connected to the lifting and bailing oil production machine (8) connection, the wellhead connection device (2) is connected to a production pipeline (9) and an injection pipeline (10), the production pipeline (9) and the injection pipeline (10) are respectively provided with a production valve (9-1) and an injection valve (10-1), the tool string (6) comprises a pump (6-1), a weighted rod (6-2) and a wax remover (6-3), the top end of the pump (6-1) is plugged into or wound around one end of a flexible continuous sucker rod (7), the bottom of the pump (6-1) is provided with a weighted rod (6-2), the bottom of the weighted rod (6-2) is provided with a wax remover (6-3), and the lifting and oil production machine (8) is a drum winch type device.

2. The injection-production integrated device according to claim 1, characterized in that: The pipe string (1) comprises a casing pipe string (1-1), a pump (6-1) cooperates with the casing pipe string (1-1), and a wellhead connection device (2) comprises a casing head (2-1), a main valve (2-2) and a casing spool (2-3); the top of the casing pipe string (1-1) is connected to the casing head (2-1), a casing spool (2-3) is arranged on the top of the casing head (2-1), a side channel of the casing spool (2-3) is connected to a production pipeline (9) and an injection pipeline (10), a temperature and pressure measuring instrument (2-6) is arranged on the side channel of the casing spool (2-3), a main valve (2-2) is arranged on the top of the casing spool (2-3), and a blowout preventer (3) is arranged on the top of the main valve (2-2).

3. The injection-production integrated device according to claim 2, characterized in that: The tubing string (1) comprises an oil tubing string (1-2), a casing string (1-1) is sleeved on the oil tubing string (1-2), a wellhead connection device (2) comprises a casing head (2-1), a main valve (2-2), a casing spool (2-3), a hanger (2-4) and an oil tubing spool (2-5), the bottom of the casing head (2-1) is connected to the casing string (1-1), the top of the casing head (2-1) is provided with a casing spool (2-3), and the casing spool (2-5) is connected to the casing string (1-1). -3) is provided with a temperature and pressure measuring instrument (2-6), the top of the oil pipe string (1-2) is connected to the oil pipe spool via a hanger (2-4), the hanger (2-4) is provided on the top of the casing spool (2-3), the two side outlets of the oil pipe spool (2-5) are respectively connected to the production pipeline (9) and the injection pipeline (10), the top of the oil pipe spool (2-5) is provided with a main valve (2-2), and the top of the main valve (2-2) is provided with a blowout preventer (3).

4. An injection-production integration method adopts the injection-production integration device as claimed in claim 3, characterized in that: The method comprises the following steps: The tool string (6) is placed in the lubricant preventer (4), the top of the lubricant preventer (4) is sealed by a sealing box (5), and the blowout preventer (3) and the production valve (9-1) are closed and sealed; The injection valve (10-1) and the main valve (2-2) are opened, and the injection pipeline (10) begins to inject fluid into the pipe string (1), starting the injection process; After the injection is completed, the injection valve (10-1) and the main valve (2-2) are closed, and the production valve (9-1) and the blowout preventer (3) are still closed and sealed to carry out the well soaking; After the well is soaked, open the production valve (9-1) and the main valve (2-2). If the formation energy is sufficient, start the blowout production. If the formation energy is insufficient or the spraying cannot continue after a period of time or the spraying speed decreases after a period of time, the blowout preventer (3) and the production valve (9-1) are opened, and the oil extraction machine (8) drives the flexible continuous sucker rod (7) to control the pump (6-1) to enter the pipe string (1) and start the production. In this production process, the downward distance of the pump (6-1) can be adjusted arbitrarily within the length range of the flexible continuous sucker rod (7) according to the liquid level position and the upper limit of the bailing amount. After the production cycle is over, the pump (6-1) and other tools are pulled into the blowout preventer (4), the production valve (9-1) and the blowout preventer (3) are closed, the main valve (2-2) and the injection valve (10-1) are opened, and injection begins, and a new injection-production cycle begins.

Images