CN113820107B - Performance test method and string for expanding packer - Google Patents
Performance test method and string for expanding packer Download PDFInfo
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- CN113820107B CN113820107B CN202010535614.5A CN202010535614A CN113820107B CN 113820107 B CN113820107 B CN 113820107B CN 202010535614 A CN202010535614 A CN 202010535614A CN 113820107 B CN113820107 B CN 113820107B
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- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000011056 performance test Methods 0.000 title claims description 31
- 238000012360 testing method Methods 0.000 claims abstract description 100
- 238000012856 packing Methods 0.000 claims abstract description 31
- 230000007246 mechanism Effects 0.000 claims description 11
- 238000004088 simulation Methods 0.000 claims description 10
- 238000005266 casting Methods 0.000 claims description 3
- 230000004044 response Effects 0.000 claims description 2
- 238000007789 sealing Methods 0.000 claims description 2
- 230000003247 decreasing effect Effects 0.000 claims 1
- 230000008569 process Effects 0.000 description 10
- 238000004891 communication Methods 0.000 description 5
- 238000010998 test method Methods 0.000 description 4
- 238000007655 standard test method Methods 0.000 description 3
- 230000001360 synchronised effect Effects 0.000 description 3
- 230000005465 channeling Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
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- 238000007906 compression Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
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- 230000002349 favourable effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
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- 230000004048 modification Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/06—Measuring temperature or pressure
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
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Abstract
The invention relates to a performance testing method and a pipe string for an expanding packer. The method comprises a logging test phase comprising the steps of: running a string containing a packer to be tested into a preformed wellbore; pressing the inside of the pipe string to expand the rubber sleeve of the packer to be tested and set the rubber sleeve on the wall of the well; and pressing the annular space between the pipe string and the well bore to improve the pressure in the annular space above the packer to be tested, so as to test the underground pressure difference performance of the packer to be tested, and/or after the packing element of the packer to be tested is set, forming a circulation channel on the part of the pipe string below the packer to be tested so as to communicate the annular space between the pipe string and the well bore, pressing the annular space inside the pipe string to improve the pressure in the annular space below the packer to be tested, so as to test the underground pressure difference performance of the packer to be tested.
Description
Technical Field
The invention relates to the technical field of downhole tool design, in particular to a performance test method for an expansion packer. The invention also relates to a performance test tube string of the expanding packer.
Background
The packer is an important tool for ensuring the smooth progress and safety of downhole operations. Therefore, operators typically test the performance of the packer prior to its actual use in a well operation.
However, while packers include many types, such as wedge packers, expanding packers, compression packers, etc., all of the packers currently employ performance testing by one standard test method. The standard test method comprises the following steps: a casing is prepared in a laboratory, a packer to be tested is set into the casing, the packer is set, and pressure is applied from one or both ends of the casing to perform the test.
This test method is very simple but rather crude. There are a number of problems in using this method to test an inflatable packer. For example, a test-qualified inflatable packer may still have a problem of failure in actual use. Or after the test is finished, the expansion packer is difficult to be taken out from the casing, or damage is found after the expansion packer is taken out. In particular, for an expanding packer with shoulder protection, the original function of the shoulder protection is to avoid the damage of the shoulder of the rubber cylinder, however, the rubber cylinder at the shoulder is more easily damaged by the existing standard test method, and the expanding packer is also more difficult to take out due to the shoulder protection.
It is therefore desirable to have a performance testing method specifically for use with an inflatable packer by which at least one of the above problems can be addressed.
Disclosure of Invention
In view of the above, the present invention proposes a method for performance testing of an inflatable packer, by which at least one of the following effects can be achieved: the performance of the expansion packer is tested more accurately and effectively; the tested expansion packer can be easily taken out; the removed packer remains intact. The invention also provides a pipe string for the method.
According to a first aspect of the present invention, a performance testing method for an inflatable packer is presented, the method comprising a logging testing phase comprising the steps of: running a string containing a packer to be tested into a preformed wellbore; pressing the inside of the pipe string to expand the rubber sleeve of the packer to be tested and set the rubber sleeve on the wall of the well; and forming a circulation channel on a part of the pipe string below the packer to be tested so as to communicate an annulus between the pipe string and the well hole and press the inside of the pipe string to improve the pressure in the annulus below the packer to be tested, thereby testing the downhole differential pressure performance of the packer to be tested.
By the testing method, performance testing can be directly performed in the well, so that the testing environment and conditions can be more approximate to the actual use environment and conditions. This makes the test result more accurate and realistic. The packer which is tested to be qualified by the testing method is not easy to fail in actual use. Thus, such performance testing is more accurate and efficient.
In one embodiment, after testing the downhole differential pressure performance of the packer to be tested, the packing element of the packer to be tested is depressurized in synchrony with the annulus below the packer to be tested.
In one embodiment, the string further comprises an auxiliary packer arranged below the packer to be tested and spaced apart from the packer to be tested, and a channel mechanism arranged between the packer to be tested and the auxiliary packer, wherein the channel mechanism is provided with the circulating channel, the circulating channel is closed in an initial state, in the well logging test stage, the rubber cylinder of the packer to be tested and the rubber cylinder of the auxiliary packer are expanded and are set on the wall of the well hole by pressing into the string, and when the pressure difference performance under the packer to be tested is tested, the circulating channel on the channel mechanism is opened, and the pressure in the annulus below the packer to be tested is increased by pressing into the string, so that the pressure difference performance under the well of the packer to be tested is tested.
In one embodiment, the downhole differential pressure performance comprises a differential pressure performance under operation and/or a differential pressure performance under limit.
In one embodiment, after the packing of the packer to be tested is set, the pressure difference performance under the working condition of the packer to be tested is tested, the pressure in the annulus below the packer to be tested and the pressure in the packing of the packer to be tested are synchronously increased after the pressure difference performance under the working condition of the packer to be tested is tested, so that the pressure difference performance under the limit of the packer to be tested is tested, and then the pressure in the packing of the packer to be tested and the pressure in the annulus below the packer to be tested are synchronously reduced.
In one embodiment, the performance testing method further comprises a simulation test phase preceding the well test phase, the simulation test phase comprising: installing the packer to be tested on the base pipe and setting them together into the sleeve; pressing the inside of the central tube so as to enable the rubber cylinder of the packer to be tested to be seated on the inner wall of the sleeve; synchronously pressing the central tube and the lower cavity of the sleeve to a first test pressure, and performing differential pressure performance test of the packer to be tested under the working condition; the central tube and the lower cavity of the sleeve are synchronously pressed to a second test pressure, and the differential pressure performance test under the limit of the packer to be tested is carried out; the central tube and the lower cavity of the sleeve are synchronously decompressed to the pressure of stopping the pump; synchronously pressing the central tube and the upper cavity of the sleeve to a second test pressure, and carrying out an on-work differential pressure performance test of the packer to be tested; the lower cavity of the sleeve is decompressed to 0 so as to perform the pressure difference performance test on the limit of the packer to be tested; and synchronously decompressing the central tube and the upper cavity of the sleeve to the pump stopping pressure.
In one embodiment, the sleeve has an inner diameter that is 110% to 120% of the borehole inner diameter of the open hole wellbore to which the expanding packer is to be applied.
According to a second aspect of the present invention, a performance test tube string of an expanding packer is presented, which can be used in a logging test phase in the performance test method described above, the tube string comprising a packer to be tested, an auxiliary packer arranged below the packer to be tested, and a channel means arranged between the packer to be tested and the auxiliary packer, the channel means being configured as a selectively opened flow channel.
In one embodiment, the passage mechanism is a differential pressure slide sleeve configured to open the flow passage in response to a hold-down pressure in the string.
In one embodiment, the performance test tube string further comprises a circulation sliding sleeve arranged above the packer to be tested and a ball throwing safety joint arranged above the circulation sliding sleeve, and the performance test tube string further comprises a self-sealing ball seat arranged below the auxiliary packer.
Compared with the prior art, the method has the advantages that the performance test can be directly carried out in the well by the test method, so that the environment and the condition of the test can be more approximate to those of the actual use. This makes the test result more accurate and realistic. The packer which is tested to be qualified by the testing method is not easy to fail in actual use. Thus, such performance testing is more accurate and efficient. In addition, through the cooperation of auxiliary packer and the packer that awaits measuring for when the pressure differential performance under the packer that awaits measuring is tested, the pipe cluster can not obviously warp, even fracture because of receiving the piston force. In addition, after the test is performed, the packing element of the packer is stepped down in synchronization with the pressure in the annulus. This is very beneficial to ensure the integrity of the packer packing element and to avoid packer damage. Thus, the packer can be easily, completely, and completely removed for subsequent use after the above test method is performed.
Drawings
The invention is described in more detail hereinafter with reference to the accompanying drawings. Wherein:
FIG. 1 shows a flow chart of one embodiment of a simulation test phase of a performance testing method of an inflatable packer according to the invention;
FIG. 2 shows a schematic diagram of one embodiment of a performance test tube string of an inflatable packer according to the present invention;
FIG. 3 shows a schematic diagram of another embodiment of a performance test tube string of an inflatable packer according to the invention.
In the drawings, like parts are designated with like reference numerals. The figures are not drawn to scale.
Detailed Description
The invention will be further described with reference to the accompanying drawings.
The performance testing method of the expanding packer of the invention may include a simulation test phase performed at the surface and a logging test phase performed downhole. The performance of the expansion packer can be effectively tested through two testing stages.
Fig. 1 shows the course of the above-described simulation test phase.
In this simulation test phase, the packer to be tested is first assembled into a base pipe and then put together into a sleeve simulating the borehole wall.
In step S1, the pressure in the central pipe is increased to the setting pressure of the packer to be tested. Thereby, the packing element of the packer to be tested can be inflated and set on the inner wall of the sleeve. The packer to be tested after setting divides the space in the sleeve into an upper cavity and a lower cavity.
In step S2, further pressure is applied in the central tube, so that a lower channel on the central tube below the packer to be tested is opened. Thereby, the inner cavity of the central tube and the lower cavity of the sleeve can be communicated together through the lower channel. In this way, the lower chamber is pressurized in a subsequent process. It will be appreciated that, alternatively, a pressurizing mechanism may be provided on the side wall of the sleeve in communication with the lower chamber of the sleeve, by means of which mechanism the lower chamber is pressurized in a subsequent process. In this case, step S2 may be omitted.
In step S3, further pressing is performed in the central tube such that the pressure in the packing of the packer to be tested is raised to the first test pressure P1 together with the pressure in the lower chamber of the sleeve. The pressure within the packing of the packer to be tested and the pressure in the lower chamber of the sleeve are maintained at a first test pressure P1 and are stable for a period of time (e.g., 2 hours). During this process, the pressure in the upper chamber of the sleeve is maintained at 0, or substantially 0. Thus, the pressure difference performance of the packer to be tested under the working condition can be tested. The differential pressure performance under operation refers to the load-bearing capacity of the packer to be tested for the differential pressure under normal operation that it should be able to withstand. If the pressure in the upper cavity and the lower cavity of the sleeve and the pressure in the rubber cylinder of the packer to be tested are stable and kept stable in the testing process, the pressure difference performance of the packer to be tested under the working condition is qualified. Otherwise, the pressure difference performance of the test packer under the working condition is not qualified.
In step S4, simultaneous pressing into the center tube and the lower chamber is continued so that the pressure in the packing of the packer to be tested is raised to a second test pressure (highest construction pressure) P2 together with the pressure in the lower chamber of the sleeve. At this point, the packing element of the packer under test is still held seated on the inner wall of the sleeve and the pressure in the upper chamber of the sleeve is maintained at 0, or substantially 0. The pressure is maintained stable for a period of time, for example 2 hours. Thus, the differential pressure performance at the limit of the packer to be tested can be tested. The pressure difference performance under the limit refers to the bearing capacity of the packer to be tested for the pressure difference under the maximum working condition which the packer can bear, and if the pressure in the upper cavity and the lower cavity of the sleeve and the pressure in the rubber cylinder of the packer to be tested are stable in the testing process, the pressure difference performance under the limit of the packer to be tested is qualified. Otherwise, the pressure difference performance of the test packer under the working condition is not qualified.
In step S5, the central tube and the lower chamber are simultaneously and synchronously depressurized such that the pressure in the packing of the packer to be tested is reduced to a pump-down pressure P3 together with the pressure in the lower chamber of the sleeve. The pump down pressure P3 herein refers to the sum of the pump pressure and the fluid column pressure at which the current fracturing formation construction is completed during the actual downhole operation. It should also be appreciated that the first test pressure p1=p2-P3 described above.
If step S2 is performed in the above process, the inner cavity of the central tube is brought into communication with the lower cavity of the sleeve through the lower passage. Then the lower passage may be closed so that the lower cavity of the sleeve is no longer in communication with the inner cavity of the central tube.
In step S6, the upper chambers of the central pipe and the sleeve are simultaneously pressurized, so that the pressure in the packing element of the packer to be tested and the pressure in the upper chamber of the sleeve rise to the second test pressure P2 synchronously. At the same time, the pressure in the lower chamber of the sleeve is still maintained at the pump-down pressure P3. The pressure is maintained stable for a period of time, for example 2 hours. Thus, the pressure differential performance of the packer to be tested on operation can be tested. The pressure difference performance on work refers to the bearing capacity of the packer to be tested on normal working pressure difference which the packer can bear, and if the pressure in the upper cavity and the lower cavity of the sleeve and the pressure in the rubber cylinder of the packer to be tested are stable in the testing process, the pressure difference performance on work of the packer to be tested is qualified. Otherwise, the pressure difference performance of the test packer in operation is not qualified.
In step S7, the pressure in the lower chamber of the sleeve is reduced to 0. Meanwhile, the pressure in the upper cavity of the sleeve and the pressure in the rubber cylinder of the packer to be tested are still kept to be the second test pressure P2. The pressure is maintained stable for a period of time, for example 2 hours. Thus, the differential pressure performance at the limit of the packer to be tested can be tested. The performance of differential pressure over this limit refers to the load carrying capacity of the packer to be tested for the maximum differential pressure that it should be able to withstand. If the pressure in the upper cavity and the lower cavity of the sleeve and the pressure in the rubber cylinder of the packer to be tested are stable and kept stable in the testing process, the pressure difference performance of the packer to be tested under the limit is qualified. Otherwise, the pressure difference performance at the limit of the test packer is not qualified.
In step S8, the central tube and the upper cavity of the sleeve are depressurized simultaneously, so that the pressure in the packing element of the packer to be tested and the pressure in the upper cavity of the sleeve are synchronously reduced to the pump stopping pressure or reduced to 0.
Through the simulation test stage, the performance of the packer to be tested can be effectively tested, and particularly, a plurality of performance parameters can be fully tested. In addition, the rubber cylinder of the packer to be tested can be effectively retracted through the synchronous pressure relief in the steps S5 and S8, so that the whole packer to be tested can be conveniently taken out and kept intact without damage. Even in the case where the packer is provided with a shoulder pad.
The simulation test stage is particularly suitable for an expanded open hole packer. The sleeve used is preferably a large-size sleeve with an inner diameter of, for example, 110% to 120% of the borehole inner diameter of the open hole well to which the expanding packer is to be applied. Setting within such a casing requires a greater expansion ratio of the packer rubber and a higher shoulder strength requirement for the packer rubber. This makes the shoulder of the packer more susceptible to damage. Under the environment, the pressure in the rubber cylinder is required to be prevented from instantaneously breaking through the rubber cylinder, and the risk of rubber cylinder failure is reduced, so that the test is required to be carried out by the method, and the synchronous pressure release is ensured in the test process. In particular, it is noted that the actual inside diameter of the open hole is always subject to error relative to the designed inside diameter of the borehole (i.e., the inside diameter of the borehole of the open hole for which the above-described expanding packer is intended). Through carrying out the test in above-mentioned jumbo size sleeve, if the test is qualified, can ensure more that it is difficult to become invalid when being used for the open hole well.
Figures 2 and 3 show two embodiments of a performance test tube string, respectively, of an inflatable packer used in the above-described logging test phase. The performance test tube string of the inflatable packer and the process of the logging test phase will be described in detail below with reference to fig. 2 and 3.
In the embodiment shown in FIG. 2, the performance test tube string 10A of the expanding packer includes a ball-casting safety joint 11A, a circulation sleeve 12A, a packer to be tested 13A, and a ball seat 14A, arranged in sequence from top to bottom. The tee 14A is preferably a shear tee.
During the logging test phase, the performance test tube string 10A described above may be run into the wellbore 20.
First, a pressure-building ball is put into the string 10A, and the pressure-building ball is set on the ball seat 14A. Thereby separating the space within the string 10A from the annulus between the string 10A and the wellbore 20.
Then, the pipe string is further pressed, so that the ball seat 14A is put through. At this time, the space in the string 10A is in communication with the annulus below the packer 13A to be tested.
Then, the pressure in the packing element of the packer to be tested 13A and the pressure in the annular space below the packer to be tested 13A rise to the second test pressure P2 at the same time by further pressing into the string 10A. The pressure is maintained for a period of time, for example, 2 hours. Thus, the differential pressure performance of the packer 13A under test may be tested.
Thereafter, the pressure in the packing of the packer to be tested 13A is raised to the fourth test pressure P4 in synchronization with the annular air pressure below the packer to be tested 13A. The pressure is maintained for a period of time, for example, 2 hours. Thus, the differential pressure performance at the limit of the packer 13A to be tested can be tested.
Only the differential pressure performance under limit or the differential pressure performance under operation of the packer 13A to be tested may also be tested in the logging test phase, as desired.
After the above test, the pressure in the packing of the packer 13A to be tested is reduced to the pump-off pressure P3 or to 0 in synchronization with the annular air pressure below the packer 13A to be tested. With the aid of the circulation slip 12A, the riser string is tested.
In the embodiment shown in FIG. 3, the performance test tube string 10B of the expanding packer includes a ball-casting safety joint 11B, a circulation sleeve 12B, a packer to be tested 13B, and a ball seat 14B, arranged in sequence from top to bottom. The tee 14B is preferably a self-closing tee. In addition, the performance test tube string 10B also includes an auxiliary packer 16B disposed between the packer to be tested 13B and the ball seat 14B, and a channeling mechanism 15B disposed between the packer to be tested 14B and the auxiliary packer 16B. The channeling mechanism 15B is preferably a differential pressure slide.
The test procedure using the string 10B shown in fig. 3 is as follows.
During the logging test phase, the performance test tube string 10B described above may be run into the wellbore 20.
First, a pressure-holding ball is put into the string 10B, and the pressure-holding ball is set on the ball seat 14B. Thereby separating the space within the string 10B from the annulus between the string 10B and the wellbore 20.
Then, a pressure is applied into the string 10B so that the packing of the packer 13B to be tested and the packing of the auxiliary packer 16B expand and seat against the inner wall of the wellbore.
Then, the pressure is further applied to the inside of the tube string, so that the flow passage of the passage mechanism 15B is opened. At this point, the space within the string 10B is in communication with the annulus below the packer 13B to be tested (i.e., the annulus between the packer 13B to be tested and the auxiliary packer 16B). It should be noted here that a self-closing ball seat 14B is provided in the string 10B. Self-closing ball seat 14B closes the bottom end of string 10B. Thus, the pressure in the well below the auxiliary packer 16B is not affected when pressing into the string 10B.
Thereafter, further pressure is applied into the string 10B such that the pressure in the packing of the packer 13B to be tested and the pressure in the annulus below the packer 13B to be tested and the packing of the auxiliary packer 16B rise to the second test pressure P2 simultaneously. The pressure is maintained for a period of time, for example, 2 hours. Thus, the differential pressure performance of the packer 13B under operation may be tested.
Thereafter, the pressure in the packing of the packer to be tested 13B is raised to the fourth test pressure P4 in synchronization with the intra-annular pressure below the packer to be tested 13B and the pressure in the packing of the auxiliary packer 16B. The pressure is maintained for a period of time, for example, 2 hours. The differential pressure performance at the limit of the packer 13B to be tested is thereby tested.
Only the differential pressure performance under limit or the differential pressure performance under operation of the packer 13B to be tested may also be tested in the logging test phase, as desired.
After the above test, the pressure in the packing of the packer 13B to be tested is reduced to the pump-off pressure P3 or to 0 in synchronization with the pressure in the annular space below the packer 13B to be tested and the pressure in the packing of the auxiliary packer 16B. With the aid of the circulation slip 12B, the riser string is tested.
Through the logging test stage, the actual service condition of the packer to be tested can be more effectively simulated. Therefore, the packer to be tested which is qualified through testing has higher reliability in actual use. In addition, the rubber cylinder of the packer to be tested and the rubber cylinder of the auxiliary packer can be effectively retracted through the synchronous pressure reduction in each step in the well logging test stage, so that the packer can be conveniently taken out and kept intact. Even in the case where the packer is provided with a shoulder pad.
Furthermore, it is very important that by setting the auxiliary packer, a large piston force is avoided against the string when testing the differential pressure performance under operation and the differential pressure performance under limit of the packer to be tested, but that this piston force is balanced out. On the one hand, the problems of abrasion, tearing and the like of the packer to be tested and the auxiliary packer in the set state can be avoided. On the other hand, this also helps to avoid that the string is difficult to remove from the wellbore due to crushing and also to avoid that the string breaks as a result.
Through the combination of the two stages, the packer to be tested (especially the expansion type open hole packer) is more favorable for fully, comprehensively and effectively detecting, so that the detected packer is effectively prevented from losing efficacy when being actually used for underground operation.
While the invention has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the technical features mentioned in the respective embodiments may be combined in any manner as long as there is no structural conflict. The present invention is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.
Claims (9)
1. A performance testing method for an inflatable packer, the method comprising a logging testing phase, the logging testing phase comprising the steps of:
running a string containing a packer to be tested into a preformed wellbore;
pressing the inside of the pipe string to expand the rubber sleeve of the packer to be tested and set the rubber sleeve on the wall of the well; and
After the packing element of the packer to be tested is set, a circulation channel is formed on the part of the pipe string below the packer to be tested so as to communicate the annular space between the pipe string and the well bore and press the inside of the pipe string to improve the pressure in the annular space below the packer to be tested, thereby testing the downhole differential pressure performance of the packer to be tested,
Wherein the string further comprises an auxiliary packer arranged below and spaced apart from the packer to be tested, and a passage means arranged between the packer to be tested and the auxiliary packer, on which passage means the flow passage is constructed, which flow passage is closed in an initial state,
In the logging test stage, the rubber cylinder of the packer to be tested and the rubber cylinder of the auxiliary packer are inflated and set on the wall of the well hole by pressing the rubber cylinder into the pipe string,
When the downhole differential pressure performance of the packer to be tested is tested, a circulation channel on the channel mechanism is opened, and the pressure in the annulus below the packer to be tested is increased by pressing the circulation channel into the pipe string, so that the downhole differential pressure performance of the packer to be tested is tested.
2. The performance testing method of claim 1, wherein after testing the downhole differential pressure performance of the packer to be tested, the packing of the packer to be tested is depressurized in synchronization with the annulus below the packer to be tested.
3. The performance testing method according to claim 1 or 2, wherein the downhole differential pressure performance comprises an under-service differential pressure performance and/or an under-limit differential pressure performance.
4. The performance testing method according to claim 3, wherein after the packing of the packer to be tested is set, the differential pressure performance under operation of the packer to be tested is tested first, after the differential pressure performance under operation of the packer to be tested is tested, the pressure in the annulus below the packer to be tested and the pressure in the packing of the packer to be tested are increased synchronously to test the differential pressure performance under limit of the packer to be tested, and then the pressure in the packing of the packer to be tested and the pressure in the annulus below the packer to be tested are decreased synchronously.
5. The performance testing method of claim 1 or 2, further comprising a simulation test phase preceding the well-logging test phase, the simulation test phase comprising:
installing the packer to be tested on the base pipe and setting them together into the sleeve;
pressing the inside of the central tube so as to enable the rubber cylinder of the packer to be tested to be seated on the inner wall of the sleeve;
synchronously pressing the central tube and the lower cavity of the sleeve to a first test pressure, and performing differential pressure performance test of the packer to be tested under the working condition;
The central tube and the lower cavity of the sleeve are synchronously pressed to a second test pressure, and the differential pressure performance test under the limit of the packer to be tested is carried out;
the central tube and the lower cavity of the sleeve are synchronously decompressed to the pressure of stopping the pump;
Synchronously pressing the central tube and the upper cavity of the sleeve to a second test pressure, and carrying out an on-work differential pressure performance test of the packer to be tested;
the lower cavity of the sleeve is decompressed to 0 so as to perform the pressure difference performance test on the limit of the packer to be tested;
And synchronously decompressing the central tube and the upper cavity of the sleeve to the pump stopping pressure.
6. The performance testing method of claim 5, wherein the sleeve has an inner diameter that is 110% to 120% of the borehole inner diameter of the open hole wellbore to which the expanding packer is to be applied.
7. A performance test tube string of an inflatable packer, which can be used in a logging test phase in a performance test method according to any one of claims 1-6.
8. The performance test tube string of claim 7, wherein the channel mechanism is a differential pressure slide configured to open the flow channel in response to a pressure build up in the tube string.
9. The performance test tube string of claim 7, further comprising a circulation sleeve disposed above the packer to be tested and a ball-casting safety joint disposed above the circulation sleeve, the performance test tube string further comprising a self-sealing ball seat disposed below the auxiliary packer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010535614.5A CN113820107B (en) | 2020-06-12 | 2020-06-12 | Performance test method and string for expanding packer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010535614.5A CN113820107B (en) | 2020-06-12 | 2020-06-12 | Performance test method and string for expanding packer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113820107A CN113820107A (en) | 2021-12-21 |
| CN113820107B true CN113820107B (en) | 2024-05-07 |
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