CN215860140U - Tracer agent is release in pit - Google Patents

Abstract

The utility model provides a tracer downhole release device which comprises a body, a boss and a sheath, wherein a first channel for fluid to flow through is defined in the body, the boss is arranged on the outer wall of the body, and the sheath is arranged on the boss. An annular inner cavity capable of containing a tracer is formed between the sheath and the body, and a plurality of through holes are formed in the sheath, so that the tracer in the inner cavity can move out of the body through the through holes. The tracer downhole release device is simple to disassemble, facilitates the replacement of the tracer, can be placed at multiple positions of the same well section, and facilitates the detection of fluid flow conditions of more positions.

Description

Tracer agent is release in pit

Technical Field

The utility model relates to a tracer downhole release device.

Background

In the process of oil field development, an oil field tracing technology is an important technology for dynamic monitoring in the process of oil field development. The current common tracer technology is to put tracer into the well through a tracer releasing device in the well, and monitor the flowing direction and the propelling speed of injected fluid and judge the condition of stratum communication by using the tracer. And finally, mining the tracer and the fluid passing around to the ground, and sampling, testing and calculating to obtain the change curves and the mining value conclusions of the fluid in different well sections or layers according to the mining sequence or different contents of the fluid. By the method, a basis can be provided for fracturing construction effect, static geological data verification, dynamic analysis, water and oil production profile generation and formulation of yield increase and excavation potential measures.

At present, traditional tracer is release in pit, and this kind of tracer is release in pit is mostly the screen pipe formula, and this kind of installation in pit is fixed at the mounting means in pit, and the many places of carrying on that can not be fine are laid, also can not carry out many places at a plurality of horizons of same well section and lay, consequently can't master multilayer position logging fluid flow curve effect. At the same time, the screen type tracer downhole releasing device is difficult to add or replace the tracer in the device.

SUMMERY OF THE UTILITY MODEL

In view of the technical problems described above, the present invention aims to propose a tracer downhole release device. This tracer is release in pit dismantles simply, and the change of the tracer of being convenient for can realize many places at a plurality of horizons of same well section simultaneously and lay, is convenient for detect the fluid flow condition of more horizons.

The tracer downhole release device comprises a body, a boss and a sheath, wherein the body is internally provided with a first channel for fluid communication, the boss is arranged on the outer wall of the body, and the sheath is arranged on the boss.

An annular inner cavity capable of containing a tracer is formed between the sheath and the body, and a plurality of through holes are formed in the sheath, so that the tracer in the inner cavity can move out of the body through the through holes.

In a preferred embodiment, a step is provided at the outer edge of the boss.

In a preferred embodiment, the outer wall of the sheath is provided in a general "L" shape, with a first end abutting against the outer wall of the body and a second end abutting against the step.

In a preferred embodiment, a press cap is further provided at the upper end of the body, the press cap defining a second passage therein communicating with the first passage, the press cap being configured to abut the first end of the sheath and press the sheath against the boss.

In a preferred embodiment, the axial two ends of the body are provided with external threads, the axial two ends of the pressing cap are provided with internal threads, the body and the pressing cap are connected through threads, and the body and the pressing cap are respectively connected with the downhole pipe body through threads.

In a preferred embodiment, the outer walls of the axial ends of the body are tapered such that the outer diameters thereof gradually decrease from the axial middle portion to the axial ends, and the inner walls of the axial ends of the pressing cap are tapered such that the inner diameters thereof gradually increase from the axial middle portion to the axial ends

In a preferred embodiment, a plurality of grooves in which tracer patches can be placed are provided on the inner wall of the sheath.

In a preferred embodiment, the grooves are configured as a spiral or an elongated strip

In a preferred embodiment, a seal is also provided between the body and the sheath.

In a preferred embodiment, the body, sheath and press cap are made of stainless steel metal-proof material.

Drawings

The utility model will now be described with reference to the accompanying drawings.

Figure 1 schematically shows a schematic view of a tracer downhole release device according to an embodiment of the utility model.

FIG. 2 is a schematic view of the sheath deployment of a downhole tracer release device of FIG. 1.

In the present application, the drawings are all schematic and are used only for illustrating the principles of the utility model and are not drawn to scale.

Detailed Description

The utility model is described below with reference to the accompanying drawings.

Fig. 1 shows a tracer downhole release apparatus 100 according to the utility model. As shown in fig. 1, the tracer downhole release device 100 includes a body 10 attached to a downhole tubular body (not shown). The body 10 is configured as a tube, defining a first passage 15 in fluid communication within the body 10. Meanwhile, an annular boss 20 is further disposed on the outer wall of the body 10, and a step 25 is further disposed at the outer edge of the boss 20.

As shown in fig. 1, the boss 20 circumferentially surrounds the outer wall of the body 10, and a sheath 30 is further disposed on the boss 20. The sheath 30 is configured in a barrel shape with its outer wall arranged in a general "L" shape. The first end 32 of the sheath 30 thus abuts against the outer wall of the body 10 and the second end 34 abuts against the step 25, in such a way as to connect the sheath 30 to the body 10.

As shown in fig. 1, an annular cavity 18 is formed axially between the sheath 30 and the body 10, the cavity 18 being adapted to receive a patch of tracer to be released. Meanwhile, a plurality of through holes 35 are further formed in the wall body of the sheath 30, and the through holes 35 penetrate through the sheath 30 and are communicated with the inner cavity 18. Thus, a patch of tracer placed in the cavity 18, after dissolution, can flow out of the body 10 through said through hole 35 into a space outside the body 10.

In a preferred embodiment, in order to prevent the sheath 30 from falling off the body 10, a pressing cap 40 is further provided on the body 10. The pressure cap 40 is arranged at the upper end 12 of the body 10 such that the pressure cap 40 can abut on the first end 32 of the sheath 30. On the other hand, the pressing cap 40 is connected to the body 10 by a screw, whereby the pressing cap 40 can be pressed against the sheath 30 by tightening the screw, and a vertically downward force is applied to the sheath 30, thereby pressing the sheath 30 more firmly against the step 25. A second passage 45 through which fluid flows is defined in the pressure cap 40, and the second passage 45 communicates with the first passage 15.

In a preferred embodiment, a sealing element 50 is further disposed between the body 10 and the sheath 30 in the axial direction, and the sealing element 50 may be a sealing ring, for example. The seal 50 prevents the tracer patch located in the cavity 18 from wetting into the first channel 15 in the body 10 after dissolution, thereby increasing the accuracy of tracer detection.

In addition, the body 10, the sheath 30 and the pressure cap 40 are all made of stainless steel metal materials, and have the characteristics of oxidation resistance, corrosion resistance and high temperature resistance, which is beneficial to increasing the reliability and the service life of the tracer downhole releasing device 100.

In a preferred embodiment, both axial ends of the body 10 are provided with external threads 16, and both axial ends of the pressing cap 30 are provided with internal threads 36. In one aspect, the body 10 and the cap 30 are connected by threads, which facilitates the assembly and disassembly of the sheath 30, thereby facilitating the replacement of the tracer patch in the cavity 18. On the other hand, the body 10 and the pressing cap 30 are respectively screwed with the downhole tubular body, so that the installation or the removal of the whole tracer downhole releasing device 100 is facilitated, thereby saving labor and working time. This threaded connection of the device 100 to the downhole tubular also allows flexibility in installing any number of devices 100 between any two lengths of tubular, thereby freely installing the devices 100 at multiple levels and locations within the same wellbore interval.

Meanwhile, the outer walls of the two axial ends of the body 10 are tapered, and the outer diameters thereof are gradually reduced from the middle part to the two axial ends. This is advantageous for extending the two ends of the body 10 into the pressing cap 30 and the downhole tubular body, so that the body 10 is connected with the pressing cap 30 and the downhole tubular body more stably.

Similarly, the inner walls of the pressing cap 30 at both axial ends are also constructed in a tapered shape, and the inner diameter thereof gradually increases from the axial middle portion to both axial ends. By this arrangement, it is beneficial to make the body 10 and the downhole tubular body extend into the pressure cap 30, so as to form a more stable connection.

FIG. 2 is a schematic view of the sheath deployment of a downhole tracer release device of FIG. 1. As shown in fig. 2, a plurality of grooves 60 are uniformly formed on the inner wall of the cap 30, and the grooves 60 have an elongated shape or a spiral shape. The tracer patch fits within the recess 60. Meanwhile, the through holes 35 on the protective cap 30 are all arranged in the groove 60, so that the tracer patches are opposite to the through holes 35. Through this kind of setting, can fix the relative position of tracer paster and through-hole 35, guarantee that pipeline motion in-process tracer paster all the time with through-hole 35 is corresponding to be convenient for the tracer passes through the through-hole moves extremely outside device 100, make the tracer can be in the fluid medium in the pit dissolve more evenly.

The use of the tracer downhole delivery device 100 according to the utility model is briefly described below.

When it is desired to monitor the fluid downhole with a tracer, the body 10 and cap 30 are first connected, and a patch of tracer is placed in the cavity 18. Then, the body 10 and the press cap 40 are connected so that the press cap 30 is press-contacted to the cap 30, thereby fixing the cap 30.

After the device 100 is assembled, the two ends of the device 100 can be respectively connected with an oil pipe to be lowered into the well through threads. During this connection, the operator can install any number of devices 100 between any two sections of tubing according to the actual monitoring needs in the field to perform the monitoring operation on the downhole fluids of different formations.

Finally, the device 100 is lowered into the well along with the tubing, and when the device 100 reaches a particular location downhole, the tracer patches gradually dissolve and dissolve into the downhole fluid. At this point, the operator may then produce the fluid downhole containing the tracer to the surface and analyze the flow of the fluid downhole using the tracer.

Finally, it should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention, and do not limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing examples, or that equivalents may be substituted for elements thereof. 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 (10)

1. A tracer downhole release device, comprising: a body (10) defining a first passage (15) inside for the passage of a fluid, a boss (20) provided on the outer wall of the body, and a jacket (30) provided on the boss,

wherein an annular inner cavity (18) capable of containing the tracer is formed between the sheath and the body, and a plurality of through holes (35) are arranged on the sheath, so that the tracer in the inner cavity can move out of the body through the through holes.

2. Tracer downhole release device according to claim 1, wherein a step (25) is provided at the outer edge of the boss.

3. A tracer downhole release device according to claim 2, wherein the outer wall of the sheath is provided in a general "L" shape with a radially extending first end (32) abutting against the outer wall of the body and an axially extending second end (34) abutting against the step.

4. Tracer downhole release according to claim 3, wherein a press cap (40) is further provided at the upper end of the body, the press cap defining a second channel (45) therein communicating with the first channel,

the press cap is configured to abut a first end (32) of the sheath and press the sheath against the boss.

5. Tracer downhole release according to claim 4, wherein the body is provided with an external thread (16) at both axial ends and the press cap is provided with an internal thread (36) at both axial ends,

the body and the pressing cap are in threaded connection, and the body and the pressing cap are in threaded connection with the underground pipe body respectively.

6. The tracer downhole release device according to claim 5, wherein outer walls of the axial ends of the body are configured to be tapered, an outer diameter of the outer walls gradually decreases from an axial middle portion to the axial ends,

the inner walls of the two axial ends of the pressure cap are conical, and the inner diameter of the pressure cap is gradually increased from the middle part to the two axial ends.

7. Tracer downhole release device according to any of claims 1-6, wherein a number of recesses (60) are provided on the inner wall of the casing, in which tracer patches can be placed.

8. The tracer downhole release device of claim 7, wherein the grooves are configured in a spiral or an elongated strip.

9. Tracer downhole release device according to any of claims 1-6, wherein a seal (50) is further provided between the body and the sheath.

10. The tracer downhole release of claim 6, wherein the body, sheath, and crimp cap are each made of a stainless steel metallic material.

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