Density calibration device for cased well

Abstract

The utility model provides a density scale device for cased wells, the density scale device comprises a graduator shell and a scale block, the graduator shell is internally provided with a first cavity, and the scale block is accommodated in the first cavity; wherein one side of the graduator shell is provided with an arc-shaped shell, the arc-shaped shell is sunken towards the graduation block and is attached to the graduation block, and the side, away from the graduation block, of the arc-shaped shell is used for density graduation of a density instrument. The utility model has the beneficial effects that the arc shell and the scale block are used for simulating a casing and a stratum, so that the early-stage scale for density measurement of a density instrument for a cased well can be realized.

Description

Technical Field

[0001] This utility model relates to the field of well logging equipment technology, and in particular to a density calibration device for casing wells. Background Technology

[0002] In recent years, density logging services have gradually shifted from open-hole to casing wells, which involves accurately measuring formation bulk density in casing environments. This makes the initial calibration of density instruments a critical issue, as there are currently no density calibration devices designed for casing wells; existing calibration devices are all designed for open-hole wells.

[0003] For example, Chinese utility model patent CN217112763U discloses a density logging tool calibration device, including: a density logging tool, a support mechanism, a scale block, and a sample tank; the density logging tool is set parallel to the ground; the density logging tool is installed on the support mechanism; the scale block has a through hole along a first direction, the density logging tool passes through the through hole and abuts against the hole wall, the first direction being parallel to the ground; the sample tank and the scale block are arranged side by side along the first direction, the sample tank containing a liquid sample, and the probe of the density logging tool is inserted into the sample tank. This utility model's density logging tool calibration device directly measures and calibrates the scale block using the density logging tool, which is clearly not directly applicable to casing wells.

[0004] There are two main methods for density calibration after casing: one is to use the open-hole density calibration method, the main drawback of which is that the open-hole calibration device directly simulates the formation calibration without casing for intervals, and the measurement data after calibration needs to be corrected; the other is to perform calibration in wells with casing, the disadvantage of which is that the formation density in the well relies on previous density data, the formation is not uniform, and there are measurement errors.

[0005] Therefore, it is necessary to study a density calibration device for casing wells to solve the above problems or mitigate their effects. Utility Model Content

[0006] This invention provides a density calibration device for casing wells. By using an arc-shaped shell and a scale block to simulate the casing and formation, it enables the preliminary calibration of density instruments used in casing wells for density measurement, thereby effectively solving the above-mentioned problems or mitigating their impact.

[0007] The density calibration device for casing wells of this utility model may include a calibration housing and a calibration block, wherein the calibration housing has a first cavity and the calibration block is accommodated in the first cavity;

[0008] The scale housing has an arc-shaped shell on one side, which is recessed toward the scale block and fits against the scale block. The side of the arc-shaped shell away from the scale block is used for density calibration by the density instrument.

[0009] In one embodiment, the density scale device further includes a insert configured to fit against the side of the arcuate housing away from the scale block.

[0010] In one embodiment, the insert is an arc-shaped plate structure, and the outer arc radius of the insert matches the inner arc radius of the arc shell.

[0011] In one embodiment, the thickness of the arc-shaped shell is 5.87 mm, and the thickness of the insert is 1.04 mm, 2.18 mm, 3.32 mm, 4.49 mm, 5.64 mm, or 6.78 mm.

[0012] In one embodiment, one end of the insert is provided with a mounting portion, which is configured to engage with both sides of the scale housing when the insert is fitted and installed on the arc-shaped housing.

[0013] In one embodiment, the mounting part is provided with a handle for disassembly and assembly.

[0014] In one embodiment, the density scale device further includes a first clamping member disposed on the side of the scale block away from the arcuate housing, the first clamping member being configured to press the scale block against the arcuate housing.

[0015] In one embodiment, the density calibration device further includes a second clamping member disposed on the side of the arcuate housing away from the scale block, the second clamping member being configured to press the density instrument against the arcuate housing.

[0016] In one embodiment, the top of the scale housing is provided with lifting lugs for hoisting.

[0017] In one embodiment, the bottom of the scale housing is provided with a base for fixed support.

[0018] The density calibration device for casing wells provided by this utility model has at least the following advantages compared with the prior art:

[0019] This utility model discloses a density calibration device for casing wells. The device uses an arc-shaped shell and a scale block to simulate the casing and formation. The density instrument is then applied to the arc-shaped shell for calibration, simulating calibration in a casing well. This device enables the calibration of density instruments used to measure the density of casing wells, thereby improving the accuracy of density measurement in casing wells and reducing the difficulty of data correction. Attached Figure Description

[0020] The present invention will be described in more detail below based on embodiments and with reference to the accompanying drawings.

[0021] Figure 1 This is a front sectional view of the density scale device according to an embodiment of the present invention;

[0022] Figure 2 This is a top view of the density scale device according to an embodiment of the present invention;

[0023] Figure 3 This is a schematic diagram of the insert of an embodiment of the present utility model;

[0024] Figure 4 This is a schematic diagram of the scale block according to an embodiment of the present invention.

[0025] In the accompanying drawings, the same parts use the same reference numerals. The drawings are not drawn to scale.

[0026] Figure label:

[0027] 1-Scale housing, 2-Arc housing, 3-Scale block, 4-Insert plate, 5-Mounting part, 6-Handle, 7-First clamping part, 8-Arc groove, 9-Second clamping part, 10-Lifting lug, 11-Base. Detailed Implementation

[0028] The present invention will be further described below with reference to the accompanying drawings.

[0029] like Figure 1 and Figure 2 As shown, the density calibration device for casing wells of this utility model may include a scale housing 1 and a scale block 3. The scale housing 1 has a first cavity, and the scale block 3 is accommodated in the first cavity.

[0030] Among them, the outer shell 1 of the scale is provided with an arc shell 2 on one side. The arc shell 2 is recessed towards the scale block 3 and fits against the scale block 3. The side of the arc shell 2 away from the scale block 3 is used for density calibration of the density instrument.

[0031] Specifically, the density calibration device uses an arc-shaped shell 2 to simulate the casing and a scale block 3 to simulate the formation. The arc-shaped shell 2 and the scale block 3 are in contact to simulate the state of the casing in the formation. This allows the density instrument used to measure the density of the casing well to be calibrated by acting on the arc-shaped shell 2, thus simulating calibration in the casing well. This can improve the accuracy of density measurement in the casing well and reduce the difficulty of data correction.

[0032] It should be noted that the materials of the scale housing 1 and the arc-shaped housing 2 are the same as those of the sleeve, and can all be made of stainless steel. The scale block 3 can be a rock scale block, or a standard scale block made of aluminum, aluminum-magnesium alloy, sulfur, or other materials, which can be used for calibration of density instruments through value transfer. The arc-shaped housing 2 is a plate-like structure formed by an arc extending along its axial direction, such as part of a cylindrical wall, rather than a spherical arc portion.

[0033] Furthermore, a cylindrical shell can be provided on one side inside the scale housing 1. The cylindrical shell passes through the scale housing 1, and the outer side of the cylindrical shell and the inner side of the scale housing 1 form a sealed first cavity. The inner side of the cylindrical shell has a second cavity that extends through the top. The arc-shaped shell 2 is a part of the cylindrical shell near the scale block 3. The density instrument can extend into the second cavity from the top of the cylindrical shell and act on the arc-shaped shell 2 to perform density calibration. In this way, the cylindrical shell can be used to simulate the entire sleeve structure, and at the same time, it is convenient to add and install the insert 4.

[0034] The following needs to be explained: Figure 1 Appendix Figure 2 The following embodiments are described using the arc-shaped housing 2 as part of a cylindrical housing as an example. In this case, the scale housing 1 is the overall housing of the device and can be a square cylindrical structure. The arc-shaped housing 2 has an inner side and an outer side, that is, its inner side is the side away from the scale block 3, and its outer side is the side that is in close contact with the scale block 3.

[0035] Furthermore, the scale block 3 may include at least two scale blocks 3 with different density values. For example, it may include a low-density scale block and a high-density scale block.

[0036] In one example, such as Figure 1 and Figure 2 As shown, the density scale device also includes a insert 4, which is configured to fit against the side of the arc-shaped housing 2 away from the scale block 3.

[0037] Specifically, the insert 4 is detachably inserted into the second cavity, and the insert 4 is attached to the inner wall of the cylindrical shell located on one side of the scale block 3, that is, the insert 4 is attached to the inner wall of the arc shell 2. In this way, the insert 4 can cooperate with the arc shell 2 to simulate the casing wall in the corresponding casing well. Inserts 4 of different thicknesses are stacked with the arc shell 2 to form commonly used casings of different wall thicknesses, which can improve the applicability of the density scale device and reduce the user's manufacturing cost.

[0038] In one example, such as Figures 1 to 3 As shown, the insert 4 is an arc-shaped plate structure, and the outer arc radius of the insert 4 matches the inner arc radius of the arc shell 2.

[0039] Specifically, the structure of the insert 4 matches the structure of the arc-shaped shell 2, and is a long, arc-shaped plate structure. The outer arc radius of the insert 4 is the same as the inner arc radius of the arc-shaped shell 2, so that the outer arc plate surface of the insert 4 can completely fit against the inner sidewall of the arc-shaped shell 2. The length of the insert 4 is at least greater than half the length of the arc-shaped shell 2, so that the density instrument can be inserted into the second cavity to perform calibration of different sleeve thicknesses.

[0040] In one example, the thickness of the arc-shaped shell 2 is 5.87 mm, and the thickness of the insert 4 is 1.04 mm, 2.18 mm, 3.32 mm, 4.49 mm, 5.64 mm, or 6.78 mm.

[0041] Specifically, the thickness of the arc-shaped shell 2 is 5.87 mm, which is the commonly used minimum sleeve thickness. The thickness of the insert 4 can be designed to be 1.04 mm, 2.18 mm, 3.32 mm, 4.49 mm, 5.64 mm, or 6.78 mm, so that when the insert 4 is combined with the arc-shaped shell 2, it can respectively simulate commonly used sleeves with thicknesses of 6.91, 8.05, 9.19, 10.36, 11.51, or 12.65 mm, thereby further improving the applicability of the density calibration device.

[0042] In one example, such as Figure 3 As shown, one end of the insert 4 is provided with a mounting part 5, which is configured to be engaged on both sides of the scale housing 1 when the insert 4 is attached to the arc housing 2.

[0043] Specifically, the mounting part 5 is fixedly connected to one end of the insert 4 in the length direction, and the mounting part 5 protrudes from both sides of the insert 4 in the width direction, so that when the insert 4 is inserted into the second cavity, the mounting part 5 abuts against the top of the arc shell 2, and the two sides of the mounting part 5 in the width direction can be locked onto both sides of the scale shell 1, so that the insert 4 can remain stable after being inserted into the second cavity.

[0044] In one example, such as Figure 3As shown, the mounting part 5 is provided with a handle 6 for disassembly and assembly, which can be lifted to disassemble the insert 4, so as to replace inserts 4 of different thicknesses.

[0045] In one example, such as Figure 1 and Figure 2 As shown, the density calibration device also includes a first clamping member 7, which is disposed on the side of the scale block 3 away from the arc-shaped housing 2. The first clamping member 7 is configured to press the scale block 3 against the arc-shaped housing 2. In this way, the clamping action of the first clamping member 7 can make the scale block 3 fit tightly against the arc-shaped housing 2 to simulate the state of the casing when it is in the formation.

[0046] Furthermore, the first clamping element 7 can be a clamping screw. The first clamping element 7 can be screwed through a screw hole on the scale housing 1 to adjust the clamping scale block 3. The number of first clamping elements 7 can be set to multiple depending on the specific situation. The size of the scale block 3 should be adapted to the size of the first cavity as much as possible so that the scale block 3 fits snugly against the arc-shaped housing 2, and also reduces the adjustment distance of the first clamping element 7.

[0047] In one example, such as Figure 4 As shown, the scale block 3 has an arc-shaped groove 8 that matches the outer side of the arc-shaped housing 2. The radius of the arc-shaped groove 8 matches the outer radius of the arc-shaped housing 2 so that the scale block 3 can fit tightly against the arc-shaped housing 2.

[0048] Furthermore, the arc of the arc-shaped groove 8 can be 180°, and the thickness of its scale surface is not less than 0.5m.

[0049] In one example, such as Figure 1 and Figure 2 As shown, the density calibration device also includes a second clamping member 9, which is disposed on the side of the arc-shaped housing 2 away from the scale block 3. The second clamping member 9 is configured to press the density instrument against the arc-shaped housing 2.

[0050] Specifically, the second clamping member 9 can be set on the side of the cylindrical shell away from the scale block 3, that is, the shell part of the cylindrical shell on the other side of the arc shell 2. Both the scale shell 1 and the cylindrical shell are provided with through holes. The second clamping member 9 is sequentially inserted through the through holes of the scale shell 1 and the cylindrical shell, and can adjust the length of the insertion into the second cavity to press the density instrument against the inner wall of the arc shell 2, so as to improve the accuracy of the density instrument scale calibration.

[0051] Furthermore, the second clamping element 9 can be a telescopic cylinder or a telescopic rod.

[0052] In one example, such as Figure 1 and Figure 2As shown, the top of the scale housing 1 is provided with lifting lugs 10 for hoisting, so as to facilitate the handling of the density scale device. The number of lifting lugs 10 can be 4, and they are symmetrically distributed on the top of the scale housing 1.

[0053] In one example, such as Figure 1 and Figure 2 As shown, the bottom of the scale housing 1 is provided with a base 11 for fixed support, so as to facilitate the installation of the scale housing 1 and provide a stable foundation for the density scale device.

[0054] To better understand the above embodiments, the usage process of the density scale device of this utility model will be further explained below with reference to the accompanying drawings.

[0055] Low-density value calibration: First, a low-density value calibration block 3 is installed in the first cavity inside the calibrator housing 1, and the first clamping member 7 is used to press it tightly against the outside of the arc-shaped housing 2. Then, the density instrument is inserted into the second cavity of the cylindrical housing, and the second clamping member 9 is used to press the density instrument against the inner wall of the arc-shaped housing 2, so that the push plate of the density instrument is in close contact with the inner wall of the arc-shaped housing 2. Finally, the density instrument is powered on to perform density calibration. According to the logging requirements, inserts 4 of different thicknesses can be inserted to cooperate with the arc-shaped housing 2 to simulate casings of different thicknesses, and density calibration is performed according to the above steps to complete the calibration of inserts 4 of different thicknesses.

[0056] High-density value scale block calibration: A high-density value scale block 3 is installed in the first cavity inside the scale housing 1, and the same steps as the low-density value scale block calibration are performed to complete the high-density value calibration of different inserts 4.

[0057] Although the present invention has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of the invention. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A density calibration device for casing wells, characterized in that, The density calibration device includes a scale housing and a scale block, the scale housing having a first cavity, and the scale block being accommodated within the first cavity; The scale housing has an arc-shaped shell on one side, which is recessed toward the scale block and fits against the scale block. The side of the arc-shaped shell away from the scale block is used for density calibration by the density instrument.

2. The density calibration device for casing wells according to claim 1, characterized in that, The density scale device also includes a insert configured to fit against the side of the arcuate housing away from the scale block.

3. The density calibration device for casing wells according to claim 2, characterized in that, The insert is an arc-shaped plate structure, and the outer arc radius of the insert matches the inner arc radius of the arc shell.

4. The density calibration device for casing wells according to claim 3, characterized in that, The thickness of the arc-shaped shell is 5.87 mm, and the thickness of the insert is 1.04 mm, 2.18 mm, 3.32 mm, 4.49 mm, 5.64 mm, or 6.78 mm.

5. The density calibration device for casing wells according to claim 2, characterized in that, One end of the insert is provided with a mounting part, which is configured to be engaged on both sides of the scale housing when the insert is fitted and installed on the arc housing.

6. The density calibration device for casing wells according to claim 5, characterized in that, The mounting section is equipped with a handle for disassembly and assembly.

7. The density calibration device for casing wells according to any one of claims 1 to 6, characterized in that, The density scale device further includes a first clamping member disposed on the side of the scale block away from the arcuate housing, and the first clamping member is configured to press the scale block against the arcuate housing.

8. The density calibration device for casing wells according to any one of claims 1 to 6, characterized in that, The density calibration device further includes a second clamping member disposed on the side of the arc-shaped housing away from the scale block, and the second clamping member is configured to press the density instrument against the arc-shaped housing.

9. The density calibration device for casing wells according to any one of claims 1 to 6, characterized in that, The top of the scale housing is provided with lifting lugs for hoisting.

10. The density calibration device for cased wells according to any one of claims 1 to 6, characterized in that, The bottom of the scale housing is provided with a base for fixed support.

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