High-temperature-resistant and high-pressure-resistant well cementation cement expansion or shrinkage testing device
By designing a high-temperature and high-pressure cementing cement expansion or contraction test device, the combination of cup body, cup lid, positioning ring and piston is used to solve the problems of defoaming, error and cost of the existing cement testing methods, and achieve high precision , low-cost cement expansion or shrinkage testing improves the accuracy of cement consolidation quality evaluation.
Patent Information
- Application Number
- CN202420585000.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-25
- Publication Date
- 2024-12-17
- Estimated Expiration
- 2034-03-25
AI Technical Summary
The existing cement testing methods cannot be completely defoamed, and the injector is not closed affects the experimental results, the measurement error is large and the equipment cost is high, which affects the cement consolidation quality.
Design a high-temperature and high-pressure cement expansion or contraction testing device, including cup body, cup lid, positioning ring and piston, to measure the shrinkage or expansion performance of cement by piston displacement, use sealing ring and counterscrew to avoid cement leakage, with precision High, low cost.
High-precision and low-cost cement expansion or shrinkage testing is achieved, which reduces measurement errors, reduces equipment costs, and improves the accuracy of cement consolidation quality evaluation.
Smart Images
Figure CN222189276U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of cement testing, in particular to a high temperature and high pressure resistant cementing cement expansion or contraction testing device. Background Art
[0002] Poor consolidation between cement, casing and formation will seriously affect the later production of oil and gas and the use of enhanced production increase technology, and may even cause the oil well to be scrapped. In addition to factors such as cement slurry properties, formation conditions and cementing construction technology, the volume contraction and expansion of cement slurry during the hardening process is also an important factor affecting the quality of cement consolidation.
[0003] There is an existing linear expansion ring test method, but this method has disadvantages. First, it is impossible to completely eliminate bubbles during the cement injection process; second, when the cement overflows the injection port, the injection port is not sealed after the injection is stopped, so that the cement contacts the curing medium (water), affecting the experimental results; in addition, there is an error in the distance test between the two steel balls on both sides of the expansion outer ring opening because the force cannot be controlled by the vernier caliper; in addition, there is also the Qiandele dilatometer in the industry. This equipment needs to be used together with a static gel strength analyzer to test the pressure change through the radial pressure sensor on the side wall of the kettle to calculate the change in cement expansion rate. The cost of this equipment is very high, and the cost together with the static gel strength analyzer is about RMB 1 million or more. Utility Model Content
[0004] The utility model aims to provide a high temperature and high pressure resistant cement expansion or contraction testing device for solving the above technical problems.
[0005] The technical solution adopted by the utility model is as follows:
[0006] A high-temperature and high-pressure well cement expansion or contraction testing device comprises a cup body, a cup cover, a positioning ring and a piston. The cup cover is provided at one end of the cup body, the positioning ring is detachably provided at the other end of the cup body, the piston is provided inside the cup body, and the outer peripheral wall of the piston is interference fit with the inner peripheral wall of the cup body.
[0007] Preferably, the diameter of one end of the cup body is larger than the diameter of the other end of the cup body.
[0008] Preferably, a plurality of annular grooves are formed on the outer peripheral wall of the piston, a sealing ring is respectively disposed in each of the annular grooves, and the piston is disposed at the other end of the cup body.
[0009] Preferably, the cup cover is threadedly connected to the cup body.
[0010] Preferably, it further comprises a countersunk screw, a countersunk hole is provided in the middle of the cup cover, a threaded hole is penetrated through the bottom wall of the countersunk hole, and the countersunk screw is installed in the threaded hole.
[0011] Preferably, the outer diameter of the positioning ring is the same as the outer diameter of the other end of the cup body, and the inner diameter of the positioning ring is larger than the outer diameter of the piston.
[0012] The above technical solution has the following advantages or beneficial effects:
[0013] In the utility model, through the arrangement of the cup body, the cup cover, the positioning ring and the piston, the shrinkage or expansion performance of the cement can be determined by measuring the displacement of the piston, and the displacement of the piston can be converted into the shrinkage / expansion of the cement, and the manufacturing cost is low, the precision is high and the error is small. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 It is a schematic diagram of the internal structure of the high temperature and high pressure resistant cement expansion or contraction testing device of the utility model;
[0015] Figure 2 It is a structural schematic diagram of the piston in the utility model.
[0016] In the figure: 1. cup body; 2. cup cover; 3. positioning ring; 4. piston; 5. sealing ring; 6. countersunk screw; 7. countersunk hole; 8. threaded hole; 9. annular groove. DETAILED DESCRIPTION
[0017] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0018] In the description of the present invention, it should be noted that if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, if the terms "first", "second", "third" appear, they are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.
[0019] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0020] Figure 1 It is a schematic diagram of the internal structure of the high temperature and high pressure resistant cement expansion or contraction testing device of the utility model; Figure 2 This is a schematic diagram of the structure of the piston in the utility model, please refer to Figure 1 to Figure 2 As shown, a preferred embodiment is shown, which is a high temperature and high pressure resistant cement expansion or contraction testing device, comprising a cup body 1, a cup cover 2, a positioning ring 3 and a piston 4. The cup body 1 is provided with a cup cover 2 at one end, and a positioning ring 3 is detachably provided at the other end of the cup body 1. The cup body 1 is provided with a piston 4 inside, and the outer peripheral wall of the piston 4 is interference fit with the inner peripheral wall of the cup body 1. In this embodiment, see Figure 1 As shown, the caliber of one end of the cup body 1 is larger than the caliber of the other end of the cup body 1, the piston 4 is arranged in the cup body 1, and the outer peripheral wall of the piston 4 is interference fit with the inner wall of the other end of the cup body 1, which can prevent the cement slurry inside the cup body 1 from leaking. The cup cover 2 and the cup body 1 are threadedly connected to facilitate the installation and removal of the cup cover 2, and a sealing ring is also arranged between the cup cover 2 and the cup body 1 for sealing therebetween.
[0021] Further, as a preferred embodiment, a plurality of annular grooves 9 are formed on the outer peripheral wall of the piston 4, a sealing ring 5 is respectively disposed in each annular groove 9, and the piston 4 is disposed at the other end of the cup body 1. The piston 4 is sealed between the sealing ring 5 and the inner wall of the other end of the cup body 1, which can prevent leakage of cement slurry.
[0022] Further, as a preferred embodiment, it also includes a countersunk screw 6, a countersunk hole 7 is opened in the middle of the cup cover 2, a threaded hole 8 is opened through the bottom wall of the countersunk hole 7, and the countersunk screw 6 is installed in the threaded hole 8. The countersunk screw 6 can be removed, which is convenient for adding cement slurry to the inside of the cup body 1 and also convenient for extracting excess cement slurry from the inside of the cup body 1.
[0023] Furthermore, as a preferred embodiment, the outer diameter of the positioning ring 3 is the same as the outer diameter of the other end of the cup body 1, which is convenient for supporting the cup body 1, wherein the cup body 1 is directly placed on the positioning ring 3, and the inner diameter of the positioning ring 3 is larger than the outer diameter of the piston 4, which is convenient for the piston 4 to enter the positioning ring 3.
[0024] The cement expansion or contraction test device in this embodiment needs to be used in conjunction with an external high-temperature and high-pressure curing kettle, and a diaphragm is provided inside the high-temperature and high-pressure curing kettle to completely isolate the cement expansion or contraction test device from the pressurized medium water.
[0025] When in use, first install the piston 4 at the other end of the cup body 1, and squeeze the piston 4 into the cup body 1 by pressing the cup body 1, so that the side surface of the piston 4 close to the positioning ring 3 is flush with the other end surface of the cup body 1, and then the other end of the cup body 1 is vertically placed on the upper surface of the positioning ring 3, and then cement slurry is injected into the cup body 1 from one end of the cup body 1 until the upper surface of the cement slurry is flush with the surface of one end of the cup body 1, and then the cup cover 2 is installed. Then use an external needle tube to add a small amount of cement slurry to the inside of the cup body 1 through the countersunk hole 7 position. It is necessary to avoid the overflow of cement slurry. If there is any overflow of cement slurry, the excess cement slurry can be extracted through the countersunk hole 7 position, and then the countersunk screw 6 is installed. After the installation is completed, the other end of the cup body 1 is facing upwards, and a vernier caliper is used to test the distance from the piston 4 part to the other end surface of the cup body 1. Several points can be measured to find the average value to minimize the measurement error. Then put the whole kettle into a high temperature and high pressure curing kettle, design the curing age of cement stone, cool it down to 77℃ and take it out when the age is reached, and use the vernier caliper to test the distance from the piston 4 to the other end surface of the cup body 1 again. You can measure several points to get the average value to minimize the measurement error. The difference between the values measured before and after curing divided by the initial value can get the percentage of shrinkage or expansion of cement stone, so as to determine the shrinkage or expansion performance of cement. The device can still measure the volume change ml and calculate the volume change according to the equipment size.
[0026] The above description is only a preferred embodiment of the present invention, and does not limit the implementation mode and protection scope of the present invention. For those skilled in the art, it should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.
Claims
1. A high temperature and high pressure cement expansion or contraction testing device, characterized in that: It includes a cup body, a cup cover, a positioning ring and a piston. The cup cover is provided at one end of the cup body, the positioning ring is detachably provided at the other end of the cup body, the piston is provided inside the cup body, and the outer peripheral wall of the piston is interference fit with the inner peripheral wall of the cup body.
2. The high temperature and high pressure well cement expansion or contraction testing device according to claim 1, characterized in that: The diameter of one end of the cup body is larger than the diameter of the other end of the cup body.
3. The high temperature and high pressure resistant cement expansion or contraction testing device according to claim 1, characterized in that: A plurality of annular grooves are provided on the outer peripheral wall of the piston, and a sealing ring is provided in each of the annular grooves. The piston is arranged at the other end of the cup body.
4. The high temperature and high pressure resistant cement expansion or contraction testing device according to claim 1, characterized in that: The cup cover is threadedly connected to the cup body.
5. The high temperature and high pressure resistant cement expansion or contraction testing device according to claim 1, characterized in that: It also includes a countersunk screw. A countersunk hole is opened in the middle of the cup cover. A threaded hole is opened through the bottom wall of the countersunk hole. The countersunk screw is installed in the threaded hole.
6. The high temperature and high pressure resistant cement expansion or contraction testing device according to claim 1, characterized in that: The outer diameter of the positioning ring is the same as the outer diameter of the other end of the cup body, and the inner diameter of the positioning ring is larger than the outer diameter of the piston.