CN109138906B - Testing device and method for simulating comprehensive performance of underground well cementing cement sheath - Google Patents
Testing device and method for simulating comprehensive performance of underground well cementing cement sheath Download PDFInfo
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- CN109138906B CN109138906B CN201811098379.9A CN201811098379A CN109138906B CN 109138906 B CN109138906 B CN 109138906B CN 201811098379 A CN201811098379 A CN 201811098379A CN 109138906 B CN109138906 B CN 109138906B
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- 239000004568 cement Substances 0.000 title claims abstract description 85
- 238000012360 testing method Methods 0.000 title claims abstract description 68
- 238000000034 method Methods 0.000 title claims abstract description 15
- 239000007788 liquid Substances 0.000 claims abstract description 8
- 238000007789 sealing Methods 0.000 claims abstract description 6
- 238000003780 insertion Methods 0.000 claims description 18
- 230000037431 insertion Effects 0.000 claims description 18
- 230000008859 change Effects 0.000 claims description 8
- 238000004088 simulation Methods 0.000 claims description 4
- 239000002002 slurry Substances 0.000 abstract description 12
- 239000000463 material Substances 0.000 description 5
- 230000009471 action Effects 0.000 description 3
- 238000005553 drilling Methods 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000007596 consolidation process Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008093 supporting effect Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
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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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
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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
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention provides a testing device and a method for simulating comprehensive performance of an underground well cementing cement sheath, wherein the testing device comprises the following components: the inner tube is provided with a closed inner cavity, two ends of the inner tube are connected in a sealing way through connecting plates, and the closed inner cavity is filled with pressure medium; the outer tube is sleeved outside the inner tube, an annular cavity is formed between the outer tube and the inner tube, two ends of the outer tube can be respectively connected with a first outer blind plug and a second outer blind plug, and a pressure testing connector capable of injecting pressure liquid into the outer tube is connected to the first outer blind plug; wherein, the annular cavity is filled with a well cementation cement ring. The invention can test the cementing capacity of cement rings in different cement slurry systems and different annular gaps, and can conveniently and accurately measure the cementing performance of the cementing cement slurry of the oil-gas well.
Description
Technical Field
The invention relates to the field of oil and gas well drilling and completion, in particular to a testing device and method for simulating comprehensive performance of an underground well cementation cement sheath.
Background
With the continuous discovery and development of oil and gas resources, the current oil and gas exploration and development area is gradually changed from land to shallow sea and deep sea, and is changed from a conventional normal temperature and pressure condition well to a high-temperature high-pressure well or even an ultrahigh-temperature ultrahigh-pressure well. For ocean well drilling with extremely high operation daily cost, as well as high-temperature and high-pressure wells with extremely high difficulty coefficient, technical requirement and operation cost, especially for offshore high-temperature and high-pressure wells, each link in the operation has extremely critical influence on the operation timeliness and success or failure of the whole well. For a high-temperature high-pressure well, because the temperature and pressure conditions of the stratum are very bad, the high-quality well cementation cement paste can ensure the qualified well cementation effect, and the well cementation cement collar is ensured not to be damaged due to the bad temperature and pressure conditions so as to lose the supporting effect on the underground casing and the stratum, so that the drilling site, especially the high-temperature high-pressure well cementation and completion operation site has very strict requirements on the comprehensive performance of the well cementation cement paste. Therefore, it is necessary to develop an economical, convenient and efficient device for testing the cementing performance of different cementing slurries under different well bore conditions, and the cementing slurries meeting the field requirements can be rapidly and efficiently screened.
Disclosure of Invention
The invention aims to provide a device and a method for simulating comprehensive performance of a well cementing cement sheath under a well, the device is simple and visual, cementing capacity of cement sheath under different cement slurry systems and different annular gaps can be tested, and cementing performance of the well cementing cement sheath of an oil-gas well can be conveniently and accurately measured.
The above object of the present invention can be achieved by the following technical solutions:
the invention provides a testing device for simulating comprehensive performance of an underground well cementing cement sheath, which comprises:
the inner tube is provided with a closed inner cavity, two ends of the inner tube are connected in a sealing way through connecting plates, and the closed inner cavity is filled with pressure medium;
the outer tube is sleeved outside the inner tube, an annular cavity is formed between the outer tube and the inner tube, two ends of the outer tube can be respectively connected with a first outer blind plug and a second outer blind plug, and a pressure testing connector capable of injecting pressure liquid into the outer tube is connected to the first outer blind plug;
wherein, the annular cavity is filled with a well cementation cement ring.
In an embodiment of the invention, the first outer blind plug comprises a first bottom wall and a first cylinder wall connected to the periphery of the first bottom wall, the first cylinder wall is provided with a first internal thread section, the first outer blind plug is connected to one end of the outer tube through the first internal thread section in a threaded manner, and the pressure test connector is arranged on the first bottom wall.
In an embodiment of the invention, a first quick connector is connected to the first cylinder wall, and a first pressure gauge can be connected to the first quick connector.
In an embodiment of the invention, the second blind plug comprises a second bottom wall and a second cylinder wall connected to the periphery of the second bottom wall, the second cylinder wall is provided with a second internal thread section, and the second blind plug is in threaded connection with the other end of the outer tube through the second internal thread section.
In an embodiment of the invention, a second quick connector is connected to the second cylinder wall, and a second pressure gauge can be connected to the second quick connector.
In an embodiment of the invention, the well cementing cement sheath is formed in the annular cavity by an inner blind plug comprising:
one end of the stop block is provided with a plurality of axial insertion holes along the circumferential direction, and the stop block is positioned in the first outer blind plug;
a first baffle plate, on which a plurality of connecting rods are connected in the circumferential direction, the connecting rods being insertable into the plurality of axial insertion holes, the first baffle plate being located in the annular cavity;
the second baffle is positioned in the annular cavity, and the well cementation cement ring is clamped between the first baffle and the second baffle.
In an embodiment of the present invention, the number of the axial insertion holes is four, and the four axial insertion holes are provided at one end of the stopper at equal intervals in a circumferential direction of the stopper.
In an embodiment of the present invention, the first baffle plate and the second baffle plate have a first center hole and a second center hole through which the inner tube is inserted.
In an embodiment of the present invention, the first central hole is an eccentric hole, and the second central hole is an eccentric hole.
The invention also provides a test method for simulating the comprehensive performance of the underground well cementation cement sheath, which adopts the test device for simulating the comprehensive performance of the underground well cementation cement sheath, and the test method for simulating the comprehensive performance of the underground well cementation cement sheath comprises the following steps:
step S1: measuring the distance between the two ends of the well cementation cement sheath and the two ends of the inner tube respectively, and marking the initial positions of the two ends of the well cementation cement sheath on the outer tube;
step S2: injecting a liquid medium into the outer tube through the pressure test joint on the first outer blind plug;
step S3: and after the pressure test is finished, measuring the distances between the two ends of the well cementation cement sheath and the two ends of the inner pipe again, marking the actual positions of the two ends of the well cementation cement sheath after the pressure test is finished on the outer pipe, and observing the change condition of the actual positions marked on the outer pipe relative to the initial position.
The device and the method for testing the comprehensive performance of the underground well cementing cement sheath have the characteristics that:
(1) The device can carry out repeated simulation experiments, and is convenient for subsequent disassembly, maintenance and transformation;
(2) The device has high test precision, and can rapidly and accurately screen out cement paste meeting the requirements for the site;
(3) The device has the advantages of simple structure, low cost and convenient use;
(4) The method can simulate different borehole gaps according to the actual conditions of the site so as to measure the cementing performance of the cement sheath;
(5) The device can be combined with the actual situation of the site to simulate the cement bond performance under the eccentric situation of the sleeve.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic structural diagram of a test device for simulating the comprehensive performance of a well cementing cement sheath in a well.
Fig. 2 is a schematic structural view of the inner tube of the present invention.
Fig. 3 is a schematic structural view of the outer tube of the present invention.
Fig. 4 is a schematic structural view of a well cementing cement sheath of the present invention formed within an annular cavity.
Fig. 5 is a schematic diagram of a connection structure between a stopper and a first baffle of the blind plug.
Fig. 6 is a schematic structural view of the connection structure of the stop block and the first baffle plate and the inner tube.
Fig. 7 is a schematic view of the device of fig. 6 mated with an outer tube, a first outer blind plug.
FIG. 8 is a schematic view of the formation of a solid cement sheath within an annular cavity between an outer tube and an inner tube.
Reference numerals illustrate: 1. an inner tube; 11. sealing the inner cavity; 12. a connecting plate; 2. an outer tube; 21. an annular cavity; 22. an external thread section; 23. an external thread section; 3. a first outer blind plug; 31. a pressure test joint; 32. a first bottom wall; 33. a first cylinder wall; 331. a first internal thread segment; 34. a first quick connector; 35. a first pressure gauge; 36. sealing the annular space; 4. a second outer blind plug; 41. a second bottom wall; 42. a second cylinder wall; 421. a second internal thread segment; 43. a second quick connector; 44. a second pressure gauge; 5. a well cementing cement ring; 6. an inner blind plug; 61. a stop block; 611. an axial insertion hole; 62. a first baffle; 621. a first central bore; 622. a threaded hole; 63. a second baffle; 631. a second central bore; 64. and (5) connecting a rod.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Embodiment one
As shown in fig. 1, the invention provides a testing device for simulating comprehensive performance of a well cementation cement sheath in a well, which comprises an inner pipe 1 and an outer pipe 2, wherein the inner pipe 1 is provided with a closed inner cavity 11, two ends of the inner pipe 1 are connected in a sealing way through a connecting plate 12, and the closed inner cavity 11 is filled with a pressure medium; the outer tube 2 is sleeved outside the inner tube 1, an annular cavity 21 is formed between the outer tube 2 and the inner tube 1, two ends of the outer tube 2 can be respectively connected with a first outer blind plug 3 and a second outer blind plug 4, and a pressure test connector 31 capable of injecting pressure liquid into the outer tube 2 is connected to the first outer blind plug 3; wherein the annular cavity 21 is filled with a well cementing cement sheath 5.
Specifically, as shown in fig. 2, the inner tube 1 is a cylindrical steel tube with a smooth outer wall, the material and the size of which are selected by referring to the sleeve size and the material commonly used in actual operation on site, and both end surfaces of the inner tube 1 are sealed by a connecting plate 12 which is consistent with the material of the steel tube, in this embodiment, the connecting plate 12 is a circular plate, so that the inner tube 1 forms a cylinder with a sealed inner cavity 11 inside. In the present invention, the sealed inner cavity 11 of the inner tube 1 is filled with a pressure medium with a certain pressure, and the pressure medium can be, for example, water, or other safe and pollution-free fluids such as air, so as to ensure that the inner tube 1 cannot deform under the action of external force to influence the test result in the subsequent pressure test operation, thereby causing inaccurate test data.
As shown in fig. 3, the outer tube 2 is made of the same material as the inner tube 1, and is cylindrical with two open ends, an external thread section 22 and an external thread section 23 are respectively turned at two ends of the outer tube 2, the outer tube 2 is sleeved outside the inner tube 1, and an annular cavity 21 is formed between the two. In the invention, the wall thickness of the outer tube 2 can be selected according to experimental requirements, and the volume of the annular cavity 21 formed between the outer tube 2 and the inner tube 1 can be smaller by replacing the outer tube 2 with a thicker wall thickness and the same outer diameter, and accordingly, the thickness of the well cementation cement sheath 5 filled between the outer tube 2 and the inner tube 1 is smaller, so that the cementing performance of well cementation cement paste to be tested under different gap conditions of the annular cavity 21 can be simulated.
The two ends of the outer tube 2 are respectively connected with a first outer blind plug 3 and a second outer blind plug 4, and the outer diameter of the outer tube 2 is slightly smaller than the outer diameters of the first outer blind plug 3 and the second outer blind plug 4. In the present invention, referring to fig. 1, the first blind plug 3 includes a first bottom wall 32 and a first cylinder wall 33 connected to the periphery of the first bottom wall 32, the first cylinder wall 33 has a first internal thread section 331, the first blind plug 3 is screwed to one end of the outer tube 2 through the first internal thread section 331, for example, the first blind plug 3 is screwed to the external thread section 22 of the outer tube 2 through the first internal thread section 331; the pressure test connector 31 is disposed on the first bottom wall 32, and in this embodiment, the height of the pressure test connector 31 is the same as the thickness of the first bottom wall 32. Further, a first quick connector 34 is connected to the first cylinder wall 33, the first quick connector 34 is disposed on the first cylinder wall 33 between the end of the first internal thread section 331 and the first bottom wall 32, the first quick connector 34 is communicated with the inside of the first external blind plug 3, and the first pressure gauge 35 can be connected to the first quick connector 34, so that the first pressure gauge 35 can monitor the pressure change in the corresponding closed area.
In the present invention, the second blind plug 4 includes a second bottom wall 41 and a second cylinder wall 42 connected to the periphery of the second bottom wall 41, the second cylinder wall 42 has a second internal thread section 421, the second blind plug 4 is screwed to the other end of the outer tube 2 through the second internal thread section 421, for example, the second blind plug 4 is screwed to the external thread section 23 of the outer tube 2 through the second internal thread section 421. Further, a second quick connector 43 is connected to the second cylinder wall 42, the second quick connector 43 is provided on the second cylinder wall 42 between the end of the second internal thread section 421 and the second bottom wall 41, the second quick connector 43 is in communication with the inside of the second blind plug 4, and a second pressure gauge 44 can be connected to the second quick connector 43, so that the second pressure gauge 44 can monitor the pressure change in the corresponding closed area.
In the embodiment of the present invention, as shown in fig. 4, a cement sheath 5 positioned in an annular cavity 21 between an inner pipe 1 and an outer pipe 2 is formed in the annular cavity 21 by an inner blind plug 6. Specifically, the inner blind 6 includes a stopper 61, a first baffle 62 and a second baffle 63, wherein: one end of the block 61 is provided with a plurality of axial insertion holes 611 along the circumferential direction, and the block 61 is positioned in the first outer blind plug 3; the first baffle 62 is connected with a plurality of connecting rods 64 along the circumferential direction, the plurality of connecting rods 64 can be inserted into the plurality of axial insertion holes 611, and the first baffle 62 is positioned in the annular cavity 21; the second baffle 63 is located within the annular cavity 21 and the cement sheath 5 is sandwiched between the first baffle 62 and the second baffle 63.
Specifically, referring to fig. 5, the stop block 61 is a solid cylinder or a cuboid, which may be made of metal or other materials with higher strength, and a plurality of axial insertion holes 611 are formed on one end surface of the stop block 61 at intervals along the circumferential direction, the axial insertion holes 611 may be small circular holes, and the depth h of the axial insertion holes 611 may be 1 cm-1.5 cm. In the present embodiment, four axial insertion holes 611 are provided at uniform intervals at one end face of the stopper 61.
The first baffle 62 and the second baffle 63 are annular baffles, the outer diameters of the two baffles are slightly smaller than the inner diameter of the first cylinder wall 33 of the first outer blind plug 3 and the inner diameter of the second cylinder wall 42 of the second outer blind plug 4, and a first central hole 621 and a second central hole 631 are respectively arranged on the first baffle 62 and the second baffle 63 so as to be sleeved outside the inner pipe 1. In this embodiment, the first center hole 621 and the second center hole 631 are not limited to the center positions of the first baffle plate 62 and the second baffle plate 63, and the first center hole 621 of the first baffle plate 62 and the second center hole 631 of the second baffle plate 63 may be designed to have various eccentric distances according to the experimental requirements, that is, the center point of the first center hole 621 is not overlapped with the center point of the outer circumference of the first baffle plate 62, and the center point of the second center hole 631 is not overlapped with the center point of the outer circumference of the second baffle plate 63. In the present invention, the diameter of the first central hole 621 of the first baffle plate 62 and the diameter of the second central hole 631 of the second baffle plate 63 are both similar to the outer diameter of the inner tube 1 and slightly larger than the outer diameter of the inner tube 1, and the outer diameter of the first baffle plate 62 and the outer diameter of the second baffle plate 63 are slightly larger than the outer diameter of the stopper 61 and smaller than the inner diameter of the outer tube 2. In the present invention, a plurality of screw holes 622 are formed in one end surface of the first baffle plate 62 in the circumferential direction, in this embodiment, four screw holes 622 are formed in one end surface of the first baffle plate 62 in the circumferential direction at uniform intervals, and the four screw holes 622 on the first baffle plate 62 are symmetrically distributed in correspondence with the relative positions of the four axial insertion holes 611 on the stopper 61.
One end of the connecting rod 64 is threaded with an external thread segment to be screwed with a threaded hole 622 on the first baffle 62; the other end of the connecting rod 64 is a smooth metal round rod with a diameter similar to that of the axial insertion hole 611 on the stopper 61, so that the other end of the connecting rod 64 can be inserted into the axial insertion hole on the stopper 61 without free movement, and the stopper 61 and the connecting rod 64 can be separated under the action of external force.
As shown in fig. 5, after the four connecting rods 64, the stop blocks 61 and the first baffle plates 62 are connected in the above manner, relative movement or rotation cannot occur, meanwhile, the stop blocks 61 can be ensured to be kept horizontal in a free state or under the action of external force in the vertical direction in a state of being vertically placed, and by replacing the first baffle plates 62 with the first central holes 621 with different eccentric distances and the second baffle plates 63 with the second central holes 631 with different eccentric distances, the testing device can truly simulate the situation that the casing is possibly not centered on site, so that the inner pipe 1 and the outer pipe 2 in the testing device are not on the same axis, the situation that one side of the space is large and the other side of the space is small is formed, the volume of cement paste is larger for one side of the space, the thickness of the cement paste ring 5 is thicker, and the thickness of the cement ring 5 of the cement paste on the side of the space is small is relatively small, so that the cement paste rings 5 on both sides of the inner pipe 1 and the outer pipe 2 are not uniform, and the cementing capacity of the cement paste to be tested under the condition of different degrees of eccentricity of the pipe column can be tested.
The working steps of the testing device for simulating the comprehensive performance of the underground well cementing cement sheath are as follows:
1. welding connecting plates 12 at two ends of the prepared inner tube 1, deburring the two ends, and ensuring uniform outer diameter, as shown in fig. 2;
2. one threaded end of each of the four connecting rods 64 is connected with the first baffle plate 62 through threads, and the first baffle plate 62 is ensured to be horizontal;
3. passing the inner tube 1 through the first center hole 621 of the first shutter 62 until one end surface of the inner tube 1 contacts the stopper 61, as shown in fig. 5 and 6;
4. the first outer blind plug 3 and the outer tube 2 are connected together through threads, and the inner tube 1, the first baffle plate 62 and the connecting structure of the stop block 61 which are connected in the step 3 are installed into the outer tube 2 along the other end of the outer tube 2 until the bottom end surface of the stop block 61 contacts the inner end surface of the first outer blind plug 3, as shown in fig. 7;
5. setting the device connected in the step 4 vertically, wherein the first outer blind plug 3 is positioned at the lower side, and then filling the annular cavity 21 of the inner pipe 1 and the outer pipe 2 with cementing cement slurry to be tested, wherein the filled upper end surface of the cementing cement slurry is lower than the upper end surface of the annular cavity 21 between the inner pipe 1 and the outer pipe 2, as shown in fig. 4;
6. compacting the upper end surface of the filled well cementing slurry by using a second baffle 63;
7. keeping the current state for a design time T, horizontally placing the whole device, and removing the first outer blind plug 3 at the lower end, the first baffle plate 62 and the second baffle plate 63 at the two ends, as shown in FIG. 8;
8. measuring distances between positions of two end faces of the well cementation cement sheath 5 and two end faces of the inner pipe 1, marking initial positions of two ends of the well cementation cement sheath 5 on the outer pipe 2, and then respectively connecting the first outer blind plug 3 and the second outer blind plug 4 to two ends of the outer pipe 2 in the step 7, as shown in fig. 1;
9. filling a closed annulus 36 formed by the outer pipe 2, the inner pipe 1 and the well cementation ring 5 with a liquid medium through the pressure test joint 31, respectively connecting a first pressure gauge 35 and a second pressure gauge 44 on a corresponding first quick joint 34 and a second quick joint 43, and recording the current reading of the first pressure gauge 35 or zeroing the first pressure gauge 35; since the pressure change in the corresponding closed area monitored by the second pressure gauge 44 may be small, the second pressure gauge 44 requires higher accuracy than the first pressure gauge 35, while the second pressure gauge 44 may have a smaller range than the first pressure gauge 35.
10. The pressure test pipeline is connected with the pressure test joint 31, the pressure test operation is carried out on the local end, the pressure test values are respectively 2MPa, 5MPa, 8MPa, 10MPa, 15MPa and 20MPa, the pressure state is maintained for 15 minutes after each group of pressure test is finished, the pressure data of the first pressure gauge 35 and the second pressure gauge 44 are recorded in detail in the whole process of pressure test and pressure maintenance, and whether the second pressure gauge 44 is changed in the process is recorded in an important way;
11. after the pressure test is completed, the well cementation cement sheath is disassembled, the distances between the two ends of the well cementation cement sheath 5 and the two ends of the inner pipe 1 are measured again, the actual positions of the two ends of the well cementation cement sheath 5 after the pressure test is completed are marked on the outer pipe 2, and the change condition of the marked actual positions on the outer pipe 2 relative to the initial positions is observed.
In the invention, the first baffle plate 62 and the second baffle plate 63 with different eccentric distances are replaced, and the test is continuously carried out according to the steps 1-11, so that the cementing performance of cement paste to be tested under the condition that the on-site casing is not centered can be simulated.
In the invention, the outer tube 2 with different inner diameters is replaced, and the test is continuously carried out according to the steps 1-11, so that the cementing performance of cement slurry to be tested under the condition that the annular gaps between the on-site casing and the ground layer are different in size can be simulated.
Finally, each set of data results is analyzed, and if the second pressure gauge 44 has no pressure change in the whole process of pressurizing and pressure maintaining, the consolidation effect of the well cementing slurry can be considered to be good, and the cementing strength of the well cementing slurry meets the requirement under the current experimental condition.
The beneficial effects of the invention are as follows:
(1) The test device can carry out repeated simulation experiments, and is convenient for subsequent disassembly, maintenance and transformation;
(2) The testing device has high testing precision, and can rapidly and accurately screen out the well cementation cement paste meeting the requirements for the site;
(3) The testing device has the advantages of simple structure, low cost and convenient use;
(4) The testing device can be combined with the actual situation of the site to simulate the cementing performance of the well cementing slurry under the eccentric situation of the sleeve.
Second embodiment
As shown in fig. 1 to 8, the invention also provides a method for testing the comprehensive performance of the underground well cementation cement sheath, which adopts the device for testing the comprehensive performance of the underground well cementation cement sheath, and the method for testing the comprehensive performance of the underground well cementation cement sheath comprises the following steps:
step S1: measuring the distance between the two ends of the well cementation cement sheath 5 and the two ends of the inner pipe 1 respectively, and marking the initial positions of the two ends of the well cementation cement sheath 5 on the outer pipe 2;
step S2: injecting a liquid medium into the outer tube 2 through the pressure test joint 31 on the first outer blind plug 3;
step S3: and after the pressure test is finished, measuring the distances between the two ends of the well cementation cement sheath 5 and the two ends of the inner pipe 1 again, marking the actual positions of the two ends of the well cementation cement sheath 5 after the pressure test is finished on the outer pipe 2, and observing the change condition of the actual positions marked on the outer pipe 2 relative to the initial position.
The specific experimental steps described in this embodiment are described in detail in the first embodiment, and will not be described in detail here.
The method for testing the comprehensive performance of the simulated underground well cementation cement sheath can test the cementing strength of the well cementation cement sheath under the conditions of different cement sheath systems, different annular gaps and pipe column eccentricity, can conveniently and accurately measure the cementing performance of the oil-gas well cementation cement sheath, and provides theoretical guidance for on-site well cementation operation.
The foregoing is merely a few embodiments of the present invention and those skilled in the art may make various modifications or alterations to the embodiments of the present invention in light of the disclosure herein without departing from the spirit and scope of the invention.
Claims (9)
1. The utility model provides a testing arrangement of simulation well cementation cement sheath comprehensive properties in pit, its characterized in that includes:
the inner tube is provided with a closed inner cavity, two ends of the inner tube are connected in a sealing way through connecting plates, and the closed inner cavity is filled with pressure medium;
the outer tube is sleeved outside the inner tube, an annular cavity is formed between the outer tube and the inner tube, two ends of the outer tube can be respectively connected with a first outer blind plug and a second outer blind plug, the first outer blind plug is connected with a pressure test connector capable of injecting pressure liquid into the outer tube and a first pressure gauge, and the second outer blind plug is connected with a second pressure gauge;
the annular cavity is filled with a well cementation cement ring, the well cementation cement ring is formed in the annular cavity through an inner blind plug, and the inner blind plug comprises: one end of the stop block is provided with a plurality of axial insertion holes along the circumferential direction, and the stop block is positioned in the first outer blind plug; a first baffle plate, on which a plurality of connecting rods are connected in the circumferential direction, the connecting rods being insertable into the plurality of axial insertion holes, the first baffle plate being located in the annular cavity; the second baffle is positioned in the annular cavity, the well cementation cement ring is clamped between the first baffle and the second baffle, and the well cementation cement ring is positioned between the first outer blind plug and the second outer blind plug.
2. The device for testing the comprehensive performance of the simulated downhole cementing cement sheath according to claim 1, wherein the first external blind plug comprises a first bottom wall and a first cylinder wall connected to the periphery of the first bottom wall, the first cylinder wall is provided with a first internal thread section, the first external blind plug is in threaded connection with one end of the outer pipe through the first internal thread section, and the pressure testing joint is arranged on the first bottom wall.
3. The device for testing the comprehensive performance of the simulated downhole cementing ring according to claim 2, wherein a first quick connector is connected to the first cylinder wall, and the first pressure gauge can be connected to the first quick connector.
4. A device for simulating the overall performance of a well cementing cement sheath in a well according to any one of claims 1 to 3, wherein the second blind plug comprises a second bottom wall and a second cylinder wall connected to the periphery of the second bottom wall, the second cylinder wall is provided with a second internal thread section, and the second blind plug is in threaded connection with the other end of the outer pipe through the second internal thread section.
5. The device for testing the comprehensive performance of the simulated downhole cementing ring as claimed in claim 4, wherein a second quick connector is connected to said second wall, and said second pressure gauge is connectable to said second quick connector.
6. The device for testing the comprehensive performance of the underground well cementing cement sheath by simulation according to claim 1, wherein the number of the axial insertion holes is four, and the four axial insertion holes are arranged at one end of the stop block at equal intervals along the circumferential direction of the stop block.
7. The apparatus for testing the comprehensive performance of a simulated downhole cementing cement sheath as in claim 1, wherein said first baffle and said second baffle have a first central aperture and a second central aperture through which said inner pipe is threaded.
8. The apparatus for testing the comprehensive performance of a simulated downhole cementing cement sheath as claimed in claim 7, wherein said first central bore is an eccentric bore and said second central bore is an eccentric bore.
9. A method for testing the comprehensive performance of a simulated underground well cementation cement sheath, which is characterized in that the device for testing the comprehensive performance of the simulated underground well cementation cement sheath according to any one of claims 1 to 8 is adopted, and the method for testing the comprehensive performance of the simulated underground well cementation cement sheath comprises the following steps:
step S1: measuring the distance between the two ends of the well cementation cement sheath and the two ends of the inner tube respectively, and marking the initial positions of the two ends of the well cementation cement sheath on the outer tube;
step S2: injecting a liquid medium into the outer tube through the pressure test joint on the first outer blind plug;
step S3: and after the pressure test is finished, measuring the distances between the two ends of the well cementation cement sheath and the two ends of the inner pipe again, marking the actual positions of the two ends of the well cementation cement sheath after the pressure test is finished on the outer pipe, and observing the change condition of the actual positions marked on the outer pipe relative to the initial position.
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