CN203239303U - Production device for injection and production in the same well - Google Patents

Abstract

The utility model discloses an exploitation device for injection and exploitation in the same well, which comprises a pipe column and a sleeve, wherein the pipe column is sleeved in the sleeve, the sleeve is respectively provided with an oil extraction port corresponding to an oil extraction section and a water injection port corresponding to a water injection section, and an auxiliary pipe is arranged at the upper part between the pipe column and the sleeve; the pipe string comprises: the upper end of the concentric double-pipe is connected with an upper oil pipe through a Y-shaped joint, the lower end of the concentric double-pipe is connected with a lower oil pipe, and an injection allocation device is arranged on the concentric double-pipe corresponding to the water injection section; the packers are connected between the concentric double pipes and the reservoir casing pipe and are respectively positioned at the upper parts of the concentric double pipes and the positions between the oil production section and the water injection section; and the oil extraction channel is arranged on the pipe column and corresponds to the position of the oil extraction port. The utility model discloses can reduce the quantity of digging a well when the exploitation, save the well drilling cost, and can improve oil reservoir output.

Description

Production device for injection and production in the same well

technical field

The utility model relates to the layered mining technology in the field of oil field development, in particular to a mining device for injection and production in the same well, which is used for rapidly increasing the output of a mature oil field. the

Background technique

Layered production technology includes three types of development technology: layered water injection technology, layered oil recovery and injection-production in the same well. Layered water injection is currently the main technology of layered development. It is difficult to eliminate the interlayer interference caused by bottomhole flow pressure in layered oil production, and it is not tended to be applied in the field. The "same well injection and production" technology includes "downhole oil-water separation and reinjection" (i.e., downhole same well injection and production) and same well pumping and injection. In the oil layer, the same well injection is suitable for special environments such as offshore, polar and arid regions. the

The traditional downhole injection and production in the same well is to separate the produced fluid to a certain extent through downhole complex devices, and then inject the separated oily sewage back into other layers. The same power source drives two pumps for water injection and oil production. In practice, it is considered that when the oil viscosity is high (>5cP), the separation effect is difficult to guarantee; the water quality and reinjection volume of reinjection sewage are difficult to monitor; the production is unsustainable when injecting into low permeability layers or undeveloped layers; the validity period of downhole equipment is short, and sand production is difficult. This is especially true when analyzing wax. the

In addition, the oil contained in the reinjected sewage will reduce the production or turn into unavailable bound oil saturation, resulting in waste of reserves. (See Sun Qingsong's "Application of Downhole Oil-Water Separation Technology in Liaohe Oilfield", Zhang Jinsong's "Understanding of Downhole Oil-Water Separation and Same Well Reinjection" and other articles.) 

At present, there are field tests in Liaohe, Shengli, Daqing and other oilfields in China, and the water cut in the tests has decreased to varying degrees. However, if the liquid is not lifted, the production often decreases; but once the liquid is lifted, the injection-production balance will be unbalanced and the production of adjacent wells will be affected. In addition, it is difficult to monitor the parameters of reinjection, and it is difficult to achieve the balance of injection and production in reality. This is the most important factor that makes it difficult to promote. the

Utility model content

The purpose of the utility model is to provide a production device for injection and production in the same well, which can reduce the number of wells drilled during production, save costs, and increase the production of oil reservoirs. the

The above-mentioned purpose of the utility model can adopt following technical scheme to realize:

A production device for injection and production in the same well, the production device includes a pipe string and a casing, the pipe string is sleeved in the casing, and the casing is respectively provided with an oil production port and a corresponding oil production section. Corresponding to the water injection port of the water injection section, the upper part between the pipe string and the casing is provided with a secondary pipe; the pipe string includes: concentric double pipes, the upper ends of the concentric double pipes are connected with oil pipes through Y-shaped joints, concentric The lower end of the double pipe is connected with the lower oil pipe, and the position of the concentric double pipe corresponding to the water injection section is provided with an injector; a plurality of packers are connected between the concentric double pipe and the casing, and the sealing The spacers are respectively located on the upper part of the concentric double pipes and between the oil production section and the water injection section; the oil production channel is arranged on the pipe string and corresponds to the position of the oil production port. the

As mentioned above, the production device for injection and production in the same well, the concentric double pipe includes an inner pipe and an outer pipe, the outer pipe is sleeved outside the inner pipe, and the upper end of the inner pipe passes through the Y The type joint is connected with the oil pipe, the lower end of the annular space between the inner pipe and the outer pipe is isolated from the inner pipe, and the dispenser is arranged on the outer pipe. the

In the production device for injection and production in the same well as described above, the lower end of the inner pipe is connected to the lower oil pipe, and the lower end of the annular space between the inner and outer pipes is closed. the

According to the production device for injection and production in the same well as described above, the oil production channel includes a through-hole arranged on the lower oil pipe. the

As mentioned above, the production device for injection and production in the same well, the oil production channel also includes a horizontal conduit, the horizontal conduit is arranged on the concentric double pipe, the two ends of the horizontal conduit are open, and one end of the horizontal conduit is connected to the The inner tube is connected, and the other end is connected with the outer tube. the

In the production device for injection and production in the same well as described above, the lower end of the inner pipe is closed, the outer pipe is connected to the lower oil pipe, and the outer pipe and the lower oil pipe are integrally constructed, and the lower oil pipe The lower end is closed. the

In the production device for injection and production in the same well as described above, the oil production channel is a horizontal conduit, the horizontal conduit is arranged on the concentric double pipe, the two ends of the horizontal conduit are open, and one end of the horizontal conduit is connected to the The inner tube is connected, and the other end is connected with the outer tube. the

Features and advantages of the utility model are:

The traditional downhole injection-production device requires a cyclone separator and a reinjection booster pump in the downhole, power equipment in the downhole, and the structure is relatively complicated. However, in the production device of this embodiment, the pipe string is static, and no cyclone separator and reinjection booster pump are needed, so that the structure of the production device is relatively simple. the

In addition, the production device of this embodiment enables the injection and production of the two fluids to flow in parallel in the same wellbore, which can reduce the number of wells drilled, save costs, and increase the production of the oil reservoir. the

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some implementations of the present invention. Embodiments, for those of ordinary skill in the art, other drawings can also be obtained according to these drawings on the premise of not paying creative efforts. the

Fig. 1 is the first kind of embodiment schematic diagram of the exploitation device that is used for injection and production of the same well of the utility model;

Fig. 2 is the second embodiment schematic diagram of the extraction device for injection and production in the same well of the present utility model;

Fig. 3 is the third kind of embodiment schematic diagram of the exploitation device that is used for injection and production of the same well of the utility model;

Fig. 4 is the three-dimensional schematic diagram of the front view direction of the concentric double pipe of the mining device used for injection and production in the same well of the present utility model;

Fig. 5 is the three-dimensional schematic diagram of the side view direction of the concentric double pipe of the mining device used for injection and production in the same well of the utility model;

Fig. 6 is the A-A line sectional view of Fig. 2;

Fig. 7 is a comparison diagram of the effect of adopting the embodiment of the utility model and adopting deep plugging adjustment, pulse or non-pulse water control measures. the

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. example. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model. the

Implementation mode 1

The embodiment of the utility model proposes a production device for injection and production in the same well, which includes a pipe string and a casing 1, the pipe string is sleeved in the casing 1, and the casing 1 is respectively equipped with There is an oil production port 1a corresponding to the oil production section Y and a water injection port 1b corresponding to the water injection section S, and an auxiliary pipe 2 is provided at the upper part between the pipe string and the casing 1 . The string includes concentric double pipes 3, a plurality of packers 4 and oil production channels. The upper end of the concentric double pipe 3 is connected to the upper oil pipe 6 through the Y-shaped joint 5, and the lower end of the concentric double pipe 3 is connected to the lower oil pipe 7. The position corresponding to the water injection section S on the concentric double pipe 3 is provided with a dispensing device 8. A plurality of packers 4 are connected between the concentric double pipe 3 and the casing 1, and the packers 4 are respectively located on the upper part of the concentric double pipe 3 and between the oil production section Y and the water injection section S . The oil production channel is arranged on the pipe string and corresponds to the position of the oil production port 1a. the

Wherein, the auxiliary pipe 2 is also connected to the wellhead, and the design of the wellhead device can be found in patent CN201020192634.9. the

According to an embodiment of the present utility model, as shown in Fig. 4-Fig. 6, the concentric double pipe 3 includes an inner pipe 3a and an outer pipe 3b, and the outer pipe 3b is sleeved on the outside of the inner pipe 3a, so that The upper end of the inner pipe 3a is connected to the upper oil pipe 6 through the Y-shaped joint 5, and the lower end of the annular space between the inner and outer pipes 3a, 3b is isolated from the inner pipe 3a, that is, the inner and outer The lower end of the annular space between the tubes 3a, 3b is not connected to the inner tube 3a, and the dispenser 8 is arranged on the outer tube 3b. the

The traditional downhole injection-production device requires a cyclone separator and a reinjection booster pump in the downhole, power equipment in the downhole, and the structure is relatively complicated. However, in the production device of this embodiment, the pipe string is static, and no cyclone separator and reinjection booster pump are needed, so that the structure of the production device is relatively simple. the

In addition, the production device of this embodiment enables the injection and production of the two fluids to flow in parallel in the same wellbore, which can reduce the number of wells drilled, save costs, and increase the production of the oil reservoir. the

Implementation mode 2

Figure 1 and Figure 2 show the schematic diagrams of the first and second implementations of the present utility model, the pipe string shown in Figure 1 can be called the top injection type pipe string, and the pipe string shown in Figure 2 can be called Central injection type string. As shown in Figures 1 and 2, the lower end of the inner pipe 3a is connected to the lower oil pipe 7, and the lower end of the annular space between the inner and outer pipes 3a, 3b is closed. the

Further, as shown in FIG. 1 , the oil production channel includes a through-hole 9 provided on the lower oil pipe 3b. In this embodiment, the oil-water mixture in the oil production section Y enters the lower oil pipe 7 through the oil production port 1 a and the through opening 9 , and then enters the inner pipe 3 a and the upper oil pipe 6 . the

In addition, as shown in Figure 2, when there are many oil production sections Y, for example, two oil production sections Y, the oil production channel includes a through-hole 9 arranged on the lower oil pipe 3b, and a horizontal conduit 10, so The horizontal conduit 10 is arranged on the concentric double pipe 3 , both ends of the horizontal conduit 10 are open, and one end of the horizontal conduit 10 is connected to the inner pipe 3 a, and the other end is connected to the outer pipe 3 b. In this embodiment, the oil-water mixture in the oil production section Y enters the casing 1 through the oil production port 1a, enters the lower oil pipe 7 through the through hole 9, and enters the inner pipe 3a through the horizontal conduit 10. the

In this embodiment, since the inner and outer ends of the horizontal conduit 10 are respectively connected to the inner pipe 3a and the outer pipe 3b, the water in the annular space between the inner and outer pipes 3a, 3b bypasses the horizontal conduit 10 and continues to flow downward. It does not enter the inner pipe 3a; while the oil-water mixture enters the inner pipe 3a through the horizontal conduit 10, and does not enter the annular space between the inner and outer pipes 3a, 3b. the

Fig. 3 shows a schematic diagram of a third embodiment of the present invention, and the pipe string shown in Fig. 3 may be called a bottom injection type pipe string. As shown in Fig. 3, the lower end of the inner pipe 3a is closed, the outer pipe 3b is connected to the lower oil pipe 7, and the outer pipe 3b and the lower oil pipe 7 are integrally constructed, that is, the outer pipe 3b faces The lower extension is directly used as the lower oil pipe 7, and the lower end of the lower oil pipe 7 is closed. the

Further, the oil production channel is a horizontal conduit 10, which is arranged on the concentric double pipe 3, and the two ends of the horizontal conduit 10 are open, and one end is connected to the inner pipe 3b, and the other end is connected to the inner pipe 3b. One end is connected with the outer tube 3b. the

Other structures, working principles, and beneficial effects of this embodiment are the same as those of Embodiment 1, and will not be repeated here. the

Implementation mode 3

A mining method for a production device for injection and production in the same well, said mining method comprising the steps of:

A. Set oil production section Y and water injection section S in the same well. the

B. Water flows down from the secondary pipe 2 and enters the annular space between the inner and outer pipes 3a, 3b of the concentric double pipe 3. the

C. When the water level in the annular space between the inner and outer pipes 3a, 3b reaches the position of the dispenser 8, the water flows out of the outer pipe 3b through the dispenser 8, and passes through the water injection port 1b Enter the water injection section S for water injection. the

D. The oil-water mixture in the oil production section Y enters the inner pipe 3a and the upper oil pipe 6 in the pipe string through the oil production port 1a and the oil production channel, and is pumped out by the oil pump. the

Wherein, when the well is an oil well, the ultra-high aquifer in the oil well can be set as the water injection section S, and the remaining well sections can be the oil production section Y. And when the well is a water well, the well section without the water injection section in the water well is shot out as the oil production section Y, and the remaining well sections are the water injection section S. the

According to one embodiment of the present utility model, as shown in Figure 1, an oil production section Y and a water injection section S are set in the same well, and the oil production section Y is located below the water injection section S; the lower end of the inner pipe is connected to the The lower oil pipe, the annular space between the inner and outer pipes is closed, and the oil production channel is a through-hole 9 arranged on the lower oil pipe. the

According to an embodiment of the present utility model, as shown in Figure 2, two oil production sections Y and one water injection section S are set in the same well, and the water injection section S is located between the two oil production sections Y; The lower end of the pipe 3a is connected to the lower oil pipe 7, and the lower end of the annular space between the inner and outer pipes 3a, 3b is closed; the oil production passage corresponding to the oil production section Y above the water injection section S is a horizontal conduit 10, and the The horizontal conduit 10 is arranged on the concentric double pipe 3, the two ends of the horizontal conduit 3 are open, and one end thereof is connected to the inner pipe 3a, and the other end is connected to the outer pipe 3b; The oil production channel of the oil production section Y is a through-hole 9 provided on the lower oil pipe 7 . the

According to one embodiment of the present utility model, as shown in Figure 3, an oil production section Y and a water injection section S are set in the same well, and the oil production section Y is located above the water injection section S; the lower end of the inner pipe 3a is closed , the outer pipe 3b is connected to the lower oil pipe 7, and the outer pipe 3b and the lower oil pipe 7 are integrally constructed, and the lower end of the lower oil pipe 3b is closed; the oil production channel is a horizontal conduit 10, and the horizontal The conduit 10 is arranged on the concentric double pipe 3, and the two ends of the horizontal conduit 10 are open, and one end thereof is connected with the inner pipe 3a, and the other end is connected with the outer pipe 3b. the

The experimental results of this embodiment will be described below. the

The test area is located in the northeastern area of Lamadian Oilfield. It is a gentle monocline with no faults and an area of 2.16km ² . The well conditions, oil layer development, well pattern and development history are representative and can reflect the development status of Lamadian Oilfield. The span of the oil-bearing well interval is about 300m, and the oil-water and oil-gas interfaces are unified; the thickness of the interlayer mud between the Sa, Pu and Gao three sets of oil layers is generally more than 2m, and the distribution of interlayers is stable. The comprehensive water content of the reservoir is 96.5%, and the invalid circulation of injected water is serious.

Using numerical simulation technology, the traditional injection and production in the same well and the injection and production in the same well of this embodiment are implemented for the SIII or P I oil groups of 52 ultra-high water-cut oil wells and 31 water wells, as shown in Fig. 7, and in Fig. 7 Scheme A is to use the injection and production of the same well in this embodiment, scheme B is to use bottom deep adjustment and water injection, scheme C is to use bottom deep adjustment, scheme D is to use general deep adjustment, and scheme E is to use Scheme of periodic water injection. It can be seen from Fig. 7 that the injection and production effect of the same well in this embodiment is very obvious, the maximum precipitation range is 2.5 percentage points, the surface water-oil ratio is reduced from 19 to 12.3, and the ineffective fluid production at the wellhead is reduced by 1/3; the validity period is up to More than 5 years have improved the stability of production, and stable production is the top priority in mature oilfields; compared with the existing production methods, the oil has increased by 50.2% year-on-year, and the recovery rate has been increased by 1.5 percentage points within 5 years, which is of great significance. the

The characteristics and significance of the utility model embodiment are as follows:

① It can be used in water wells to greatly increase oil production well sections and greatly increase production, for example, to make Daqing Changyuan stable production to a higher level;

② It can be used in oil wells to realize "incomplete injection", avoiding the loss of oil well production, and can be adjusted horizontally;

③ When there are multiple sets of well patterns for separate production of different oil layers, applying the "injection and production in the same well" of this embodiment to the existing well pattern can realize the infill control of specific layers and save drilling costs. the

Other structures, working principles, and beneficial effects of this embodiment are the same as those of Embodiment 1 or Embodiment 2, and will not be repeated here. the

The above are only a few embodiments of the present utility model, and those skilled in the art can make various changes, modifications or combinations to the embodiments of the present utility model according to the disclosure of the application documents without departing from the spirit and scope of the present utility model. the

Claims (7)

1. A production device for injection and production in the same well, characterized in that, the production device comprises a pipe string and a casing, the pipe string is sleeved in the casing, and the casing is respectively provided with corresponding The oil production port of the oil production section and the water injection port corresponding to the water injection section, the upper part between the pipe string and the casing is provided with a secondary pipe; the pipe string includes: Concentric double pipes, the upper ends of the concentric double pipes are connected to the upper oil pipe through the Y-shaped joint, the lower ends of the concentric double pipes are connected to the lower oil pipe, and the position corresponding to the water injection section is provided with a distributor on the concentric double pipes; A plurality of packers, which are connected between the concentric double pipe and the casing, and the packers are respectively located on the upper part of the concentric double pipe and between the oil production section and the water injection section; The oil production channel is arranged on the pipe string and corresponds to the position of the oil production port. 2. The production device for injection and production in the same well according to claim 1, wherein the concentric double pipes include an inner pipe and an outer pipe, and the outer pipe is sleeved outside the inner pipe, so that The upper end of the inner pipe is connected to the upper oil pipe through the Y-shaped joint, the lower end of the annular space between the inner and outer pipes is isolated from the inner pipe, and the dispenser is arranged on the outer pipe superior. 3. The production device for injection and production in the same well according to claim 2, characterized in that the lower end of the inner pipe is connected to the lower oil pipe, and the lower end of the annular space between the inner and outer pipes is closed. 4 . The production device for injection and production in the same well according to claim 3 , wherein the oil production channel includes a through-hole provided on the lower oil pipe. 5. The production device for injection and production in the same well according to claim 4, characterized in that, the oil production channel also includes a horizontal conduit, the horizontal conduit is arranged on the concentric double pipe, and the horizontal conduit Both ends are open, and one end is connected with the inner tube, and the other end is connected with the outer tube. 6. The production device for injection and production in the same well according to claim 2, wherein the lower end of the inner pipe is closed, the outer pipe is connected to the lower oil pipe, and the outer pipe is connected to the lower oil pipe. The oil pipe is integrally constructed, and the lower end of the lower oil pipe is closed. 7. The production device for injection and production in the same well according to claim 6, characterized in that, the oil production channel is a horizontal conduit, and the horizontal conduit is arranged on the concentric double pipes, and the two horizontal conduits One end is open, and one end is connected with the inner tube, and the other end is connected with the outer tube.

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