CN113175318B - Borehole wall eyelet size measuring method with positioning function - Google Patents
Borehole wall eyelet size measuring method with positioning function Download PDFInfo
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- CN113175318B CN113175318B CN202110394484.2A CN202110394484A CN113175318B CN 113175318 B CN113175318 B CN 113175318B CN 202110394484 A CN202110394484 A CN 202110394484A CN 113175318 B CN113175318 B CN 113175318B
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- 230000003287 optical effect Effects 0.000 claims abstract description 70
- 210000002445 nipple Anatomy 0.000 claims abstract description 17
- 238000005259 measurement Methods 0.000 claims description 4
- 238000000691 measurement method Methods 0.000 claims 2
- 239000003208 petroleum Substances 0.000 abstract description 2
- 239000011295 pitch Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000003384 imaging method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
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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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Abstract
The invention belongs to the technical field of petroleum logging, and particularly relates to a method for measuring the size of a borehole wall borehole with a positioning function. The technical proposal is as follows: the well wall hole size measuring device with the positioning function comprises an underground tool unit, wherein the other end of the underground tool unit is rotationally connected with a measuring optical ruler nipple, and the other end of the measuring optical ruler nipple is connected with a positioning optical ruler nipple; the positioning optical ruler pup joint is provided with a plane light source for projecting a plane light beam perpendicular to the shaft axis and a cone light source for projecting a cone light beam taking the shaft axis as a central line; the measuring light ruler is characterized in that a lens is arranged on the short section of the measuring light ruler, four point light sources are arranged around the lens, light rays of the four point light sources are parallel to each other, light spots are projected on a well wall by the four point light sources, and a graph surrounded by the four light spots is used as the measuring light ruler. The invention provides a method for measuring the size of a borehole wall hole with a positioning function.
Description
Technical Field
The invention belongs to the technical field of petroleum logging, and particularly relates to a method for measuring the size of a borehole wall borehole with a positioning function.
Background
When the underground camera shooting instrument shoots a well wall in a vertical well, the relative position relation between a lens and a well wall shooting target is complex. As shown in fig. 7 and 8, the closer the lens is to the perforation, the larger the image; the farther the lens is from the perforation, the smaller the image; and if an included angle exists between the lens and the front direction of the target, the image is distorted. Therefore, perforation images obtained by the existing underground camera shooting instrument are obtained under different shooting conditions, the perforation images cannot be compared, and the real size of the perforation is difficult to know.
Disclosure of Invention
In order to solve the above problems in the prior art, the present invention is directed to a method for measuring borehole wall hole size with positioning function.
The technical scheme adopted by the invention is as follows:
the well wall hole size measuring device with the positioning function comprises an underground tool unit, wherein the other end of the underground tool unit is rotationally connected with a measuring optical ruler nipple, and the other end of the measuring optical ruler nipple is connected with a positioning optical ruler nipple; the positioning optical ruler pup joint is provided with a plane light source for projecting a plane light beam perpendicular to the shaft axis and a cone light source for projecting a cone light beam taking the shaft axis as a central line; the measuring light ruler is characterized in that a lens is arranged on the short section of the measuring light ruler, four point light sources are arranged around the lens, light rays of the four point light sources are parallel to each other, light spots are projected on a well wall by the four point light sources, and a graph surrounded by the four light spots is used as the measuring light ruler.
Because the distance between the device and the center of the well bore is not determined, a determination of the relative position of the device and the center of the well bore is required. After determining the relative position, the deformation of the borehole relative to the actual borehole in the photograph in a direction perpendicular to the borehole axis can be determined and the actual size of the borehole in the vertical well can be measured by measuring the optical ruler.
The positioning optical ruler pup joint can project a plane light beam and a conical light beam, and the distance between the plane light beam and the conical light beam on the well wall has a maximum value and a minimum value. And the measuring optical ruler pup joint photographs the well wall by 360 degrees, and the maximum value and the minimum value of the distance between the plane light beam and the conical light beam are determined through the measuring optical ruler in the photographs. Because the four light beams of the measuring optical ruler are parallel to each other, the distance between the four light beams of the measuring optical ruler is unchanged, and the maximum value and the minimum value of the distance between the plane light beam and the conical light beam can be determined through photographing. The distance from the device to the centre of the well bore satisfies a defined relationship due to the maximum and minimum of the spacing of the planar and conical beams. After determining the maximum and minimum of the spacing of the planar and conical beams, the distance of the device relative to the centre of the wellbore can be determined, and the true size of the borehole can be calculated again by taking a photograph of the measuring scale and borehole.
When the optical axis of the lens is coincident with the center of the shaft, the size of the pattern surrounded by the four point light sources on the measuring optical ruler and the short section of the measuring optical ruler is the same. After the lens deflects a certain angle, the size of the measuring optical ruler and the size of the pattern surrounded by the four point light sources meet a determined relation. According to the projection relation, in the photo, the size of the pattern surrounded by the four point light sources on the short section of the measuring optical ruler is the same as that of the pattern surrounded by the four point light sources on the short section of the measuring optical ruler. Therefore, after the size of the measuring optical ruler is calculated, the true size of the hole can be obtained according to the product of the proportion of the hole in the photo and the size of the measuring optical ruler. The true size of the hole can be obtained through calculation no matter how far the lens is from the hole on the well wall, so that the purpose of measuring the true size of the hole on the well wall is realized.
As a preferred embodiment of the present invention, the vertex of the conical light beam is located on the plane of the planar light beam. When the vertex of the conical light beam is positioned on the plane of the planar light beam, the pixel ratio of the maximum value and the minimum value of the distance between the planar light beam and the conical light beam can be calculated, the specific value of the maximum value and the minimum value of the distance between the planar light beam and the conical light beam is not required to be calculated, and the calculation can be simplified.
As a preferable scheme of the invention, the connecting lines of the four point light sources are rectangular, and the side connecting lines of the four point light sources are parallel to the shaft axis. And when the short section of the measuring optical ruler is basically parallel to the shaft axis and the connecting lines of the four point light sources are rectangular, the measuring optical ruler is also rectangular. The side of the measuring tape parallel to the axis of the well bore may be referred to as the transverse axis and the side perpendicular to the axis of the well bore as the longitudinal axis. Because the short section of the measuring optical ruler is basically parallel to the shaft axis, the proportion of the transverse axis of the measuring optical ruler to the transverse axis of the graph surrounded by the four point light sources is 1. The deformation proportion of the shape of the hole can be obtained by calculating the proportion of the light source graph on the short section of the measuring light ruler and the longitudinal axis of the measuring light ruler, and the calculation can be simplified.
As the preferable scheme of the invention, the center of the connecting line of the two point light sources at opposite angles coincides with the center of the lens, so that the hole on the photo is positioned at the center of the measuring optical ruler, and the measurement and calculation of the hole size are convenient.
As a preferable scheme of the invention, the downhole tool unit comprises a cable head, a first centralizer, a weighting rod and a second centralizer which are sequentially connected, and the measuring optical ruler nipple is connected to one end of the second centralizer, which is far away from the weighting rod. The first centralizer and the second centralizer can centralize the measuring optical ruler pup joint, so that the measuring optical ruler pup joint and the shaft axis are ensured to be basically kept parallel, and the transverse shaft in the photo is not deformed.
A method for measuring the size of a borehole wall with a positioning function comprises the following steps:
s1: lowering a device consisting of a downhole tool unit, a measuring optical ruler pup joint and a positioning optical ruler pup joint into a well; the lens shoots a plane light beam, a cone light beam and a measuring light ruler on a well wall by 360 degrees, and measures the maximum value and the minimum value of the distance between the plane light beam and the cone light beam in the photo; the connecting lines of the four point light sources are rectangular, and the side connecting lines of the four point light sources are parallel to the shaft axis;
s2: calculation of；
Wherein l H Z is the distance between the apex of the conical beam and the planar beam max The maximum value of the distance between the projection of the plane beam and the cone beam on the well wall in the photo; z min The minimum value of the projection distance between the plane beam and the conical beam on the well wall in the photo;
s3: calculating the projection distance of two point light sources with connecting lines perpendicular to the shaft axis on the well wall:
；
the lens rotates from a shaft axis position towards a hole position to be measured to an angle alpha, four point light sources are A, B, C, D, AB is perpendicular to the shaft axis, AD is parallel to the shaft axis, the projection of AB on the shaft wall is A 'B', and R is the shaft radius;
s4: calculating the actual size of the hole, wherein the actual size x=k×ad of the hole parallel to the shaft axis and the actual size y=j×a 'B' of the hole perpendicular to the shaft axis; wherein k is the ratio of the size of the hole in the direction parallel to the axis of the shaft in the picture to the size of the hole in AD in the picture, and j is the ratio of the size of the hole in the direction perpendicular to the axis of the shaft in the picture to the size of the hole in AB in the picture; the photo in step S4 is a photo including an eyelet among the several photos in step S1.
As a preferred embodiment of the present invention, in step S2, l H =0。
As a preferred scheme of the invention, in step S1, the downhole tool unit comprises a cable head, a first centralizer, a weighting rod and a second centralizer which are sequentially connected, and the measuring light ruler nipple is connected to one end of the second centralizer, which is far away from the weighting rod.
The beneficial effects of the invention are as follows:
the positioning optical ruler pup joint can project a plane light beam and a conical light beam, so that the distance between the plane light beam and the conical light beam on the well wall has a maximum value and a minimum value. Because the four light beams of the measuring optical ruler are parallel to each other, the distance between the four light beams of the measuring optical ruler is unchanged, and the maximum value and the minimum value of the distance between the plane light beam and the conical light beam can be determined through photographing. The distance from the device to the centre of the well bore satisfies a defined relationship due to the maximum and minimum of the spacing of the planar and conical beams. After determining the maximum and minimum of the spacing of the planar and conical beams, the distance of the device relative to the centre of the wellbore can be determined, and the true size of the borehole can be calculated again by taking a photograph of the measuring scale and borehole.
After the lens deflects a certain angle, the size of the measuring optical ruler and the size of the pattern surrounded by the four point light sources meet a determined relation. According to the projection relation, in the photo, the size of the pattern surrounded by the four point light sources on the short section of the measuring optical ruler is the same as that of the pattern surrounded by the four point light sources on the short section of the measuring optical ruler. Therefore, after the size of the measuring optical ruler is calculated, the true size of the hole can be obtained according to the product of the proportion of the hole in the photo and the size of the measuring optical ruler. The true size of the hole can be obtained through calculation no matter how far the lens is from the hole on the well wall, so that the purpose of measuring the true size of the hole on the well wall is realized.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a schematic diagram of the principle of positioning the optical ruler;
FIG. 3 is a schematic view of a positioning light ruler;
FIG. 4 is a schematic diagram of the principle of the measuring tape after lens deflection;
FIG. 5 is a graph of imaging effects in a photograph;
FIG. 6 is a schematic view of a real borehole and spot on a borehole wall;
FIG. 7 is a front view of a downhole camera shooting perforation;
fig. 8 is a top view of the downhole camera shooting perforation.
In the figure, a 1-downhole tool unit; 2-measuring the short section of the optical ruler; 3-positioning the optical ruler pup joint; 4-a wellbore; 5-eyelets; 11-cable head; 12-a first centralizer; 13-a weighted rod; 14-a second centralizer; 21-lens; 22-point light sources; 23-measuring optical ruler; 31-plane beam; 32-cone beam.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
As shown in fig. 1, the borehole wall hole dimension measuring device with the positioning function of the embodiment comprises an underground tool unit 1, wherein the other end of the underground tool unit 1 is rotationally connected with a measuring optical ruler nipple 2, and the other end of the measuring optical ruler nipple 2 is connected with a positioning optical ruler nipple 3; the positioning optical ruler pup joint 3 is provided with a plane light source for projecting a plane light beam 31 perpendicular to the axis of the shaft 4 and a cone light source for projecting a cone light beam 32 taking the axis of the shaft 4 as a central line; the measuring light ruler pup joint 2 is provided with a lens 21, four point light sources 22 are arranged around the lens 21, the light rays of the four point light sources 22 are parallel to each other, the four point light sources 22 project light spots on the well wall, and a graph surrounded by the four light spots is used as a measuring light ruler 23. In fig. 1, A, B, C, D are four point light sources 22.
Because the distance of the device from the center of the wellbore 4 is not determined, a determination of the relative position of the device from the center of the wellbore 4 is required. After determining the relative position, the deformation of the borehole 5 in the photograph in a direction perpendicular to the axis of the borehole 4 relative to the actual borehole 5 can be determined, and the actual size of the borehole 5 in the vertical well can be measured by means of the measuring scale 23.
As shown in fig. 2, the positioning optical ruler pup joint 3 can project a plane light beam 31 and a conical light beam 32, and the included angle between the plane light beam 31 and the conical light beam 32 is beta, so that the distance between the plane light beam 31 and the conical light beam 32 on the well wall has a maximum value and a minimum value. Since the four light beams of the measuring tape 23 are parallel to each other, the pitches of the four light beams of the measuring tape 23 are unchanged, and the maximum value and the minimum value of the pitches of the planar light beam 31 and the conical light beam 32 can be determined by photographing. The distance from the device to the centre of the well bore 4 satisfies a certain relationship due to the maximum and minimum of the spacing of the planar beam 31 and the conical beam 32. After determining the maximum and minimum of the spacing of the planar beam 31 and the conical beam 32, the distance of the device relative to the centre of the well bore 4 can be determined, and the true size of the borehole 5 can be calculated again by taking a photograph of the measuring scale 23 and the borehole.
When the optical axis of the lens 21 is coincident with the center of the shaft 4, the measuring optical ruler 23 and the pattern surrounded by the four point light sources 22 on the measuring optical ruler pup joint 2 have the same size. After the lens 21 deflects a certain angle, the size of the measuring optical ruler 23 and the size of the pattern surrounded by the four point light sources 22 meet a determined relation. According to the projection relation, in the photo, the size of the pattern surrounded by the four point light sources 22 on the measuring optical ruler 23 and the measuring optical ruler pup joint 2 is the same. Therefore, after calculating the size of the measuring scale 23, the true size of the aperture 5 can be obtained according to the product of the proportion of the aperture 5 in the photo and the size of the measuring scale 23. The true size of the borehole 5 can be obtained by calculation no matter how far the lens 21 is from the borehole 5 on the borehole wall, thereby achieving the purpose of measuring the true size of the borehole wall borehole 5.
Still further, the apex of the conical beam 32 is located on the plane of the planar beam 31. When the vertex of the conical light beam 32 is located on the plane where the planar light beam 31 is located, only the pixel ratio of the maximum value and the minimum value of the distance between the planar light beam 31 and the conical light beam 32 may be calculated, and the specific value of the maximum value and the minimum value of the distance between the planar light beam 31 and the conical light beam 32 does not need to be measured, so that the calculation can be simplified.
To further simplify the calculation, the four point light sources 22 are connected in a rectangular shape, and the side lines of the four point light sources 22 are parallel to the axis of the well bore 4. When the measuring optical ruler pup joint 2 is basically parallel to the axis of the shaft 4 and the connecting line of the four point light sources 22 is rectangular, the measuring optical ruler 23 is also rectangular. The side of the measuring tape 23 parallel to the axis of the well bore 4 may be referred to as the transverse axis and the side perpendicular to the axis of the well bore 4 as the longitudinal axis. Because the measuring light ruler pup joint 2 is basically parallel to the axis of the shaft 4, the ratio of the transverse axis of the measuring light ruler 23 to the transverse axis of the pattern surrounded by the four point light sources 22 is 1. The deformation proportion of the shape of the eyelet 5 can be obtained by calculating the proportion of the light source pattern on the measuring light ruler pup joint 2 and the longitudinal axis of the measuring light ruler 23, and the calculation can be simplified. The center of the connecting line of the two point light sources 22 at opposite angles coincides with the center of the lens 21, so that the aperture 5 on the photo is positioned at the center of the measuring optical ruler 23, and the measurement and calculation of the size of the aperture 5 are convenient.
The downhole tool unit 1 comprises a cable head 11, a first centralizer 12, a weighting rod 13 and a second centralizer 14 which are sequentially connected, and the measuring light ruler pup joint 2 is connected to one end, far away from the weighting rod 13, of the second centralizer 14. The first centralizer 12 and the second centralizer 14 can right the measuring light ruler pup joint 2, and ensure that the measuring light ruler pup joint 2 is basically parallel to the axis of the shaft 4, so that the transverse axis in the photo is not deformed.
A method for measuring the size of a borehole wall with a positioning function comprises the following steps:
s1: lowering a device consisting of the underground tool unit 1, the measuring optical ruler nipple 2 and the positioning optical ruler nipple 3 into a well; the lens 21 photographs the plane beam 31, the cone beam 32 and the measuring optical ruler 23 on the well wall by 360 degrees, and measures the maximum value and the minimum value of the distance between the plane beam 31 and the cone beam 32 in the photograph. The four point light sources 22 (A, B, C, D) are connected in a rectangular shape, and the side connecting lines of the four point light sources 22 are parallel to the axis of the shaft 4.
Since the four light beams of the measuring scale 23 are parallel to each other, the projection of the measuring scale 23 on the well wall can represent a size scale. By taking 360 ° shots of the borehole wall, the maximum and minimum values of the spacing of the planar beam 31 and the conical beam 32 can be directly observed in the photo. The side lines of the four point light sources 22 are parallel to the axis of the shaft 4, so that the distance between the point light sources 22 is the same as the distance between the light spots on the photo in the shaft 4 axial direction. With the pitch of the point light sources 22 known, the maximum and minimum values of the pitches of the planar light beam 31 and the conical light beam 32 are measured directly from the pitch of the light points in the photograph.
S2: as shown in FIG. 3, the intersection point O of the center line of the conical beam 32 and the plane of the plane beam 31 1 As origin, with the plane of the plane beam 31 being xO 1 The y-coordinate plane, the centerline of the cone beam 32 establishes O for the z-coordinate axis 1 -xyz space rectangular coordinate system. Where H is the apex of the conical beam 32. The projection effect of the positioning optical ruler on the well wall is shown in fig. 3. O in the figure 2 The point is the shaft center of the shaft 4 and xO 1 The intersection of the y planes has coordinates (a, b).
The projection of the conical beam 32 onto the borehole wall is a curve, and the curve equation is:
；
O 1 O 2 the z values corresponding to the two intersections of the projection of the plane beam 31 are the maximum value and the minimum value of the distance between the plane beam 31 and the cone beam 32. According to the principle that the proportion of corresponding sides of similar patterns is kept unchanged,。
then whenWhen the method is used, the following steps are included:
；
o is done 1 、O 2 Auxiliary lines of points intersecting the wellbore at E, F, E intersecting the projection of the conical beam 32 with the auxiliary line in the Z-axis direction intersecting E 'and F intersecting the projection of the conical beam 32 with the auxiliary line in the Z-axis direction intersecting F', e.gShown in fig. 3. EF is readily known as the diameter of the wellbore 4,，/>，l H is the distance between the apex of the conical beam 32 and the planar beam 31, and has:
order theThere is->；
Calculation of；
Wherein z is max Is the maximum value of the distance between the projections of the planar beam 31 and the conical beam 32 on the well wall in the photo; z min Is the minimum value of the distance between the projections of the planar beam 31 and the conical beam 32 on the well wall in the photo;
s3: as shown in FIG. 4, with O 2 As the origin, O 2 E establishing a plane rectangular coordinate system xO for y coordinate axis 2 And y. In the figure, the circular dotted line is the outer diameter of the measuring optical ruler pup joint 2, the A, B point is the point light source 22, and the A 'and B' points are the projections of A, B on the well wall respectively.
During imaging, the orientation of the recording lens 21 is equal to O 1 And E, an included angle alpha value. When the lens 21 takes a picture, the position of the maximum value of the distance between the projection of the lens 21 to the planar beam 31 and the projection of the conical beam 32 is referred to as the initial position. When the lens 21 is aligned with the aperture 5 to be measured, the rotation angle of the lens 21 relative to the initial position is α.
Calculating the distance between the projections of the two point light sources 22 perpendicular to the axis of the shaft 4 on the well wall:
；
wherein r=ab/2,h =o 1 F=2r/(1+s), R being the radius of the wellbore 4.
Substituting r and h into a formula to obtain:
；
s4: calculating the actual size of the hole 5, the actual size x=k×ad of the hole 5 parallel to the axis of the well bore 4, the actual size y=j×a 'B' of the hole 5 perpendicular to the axis of the well bore 4; wherein k is the ratio of the size of the hole 5 in the direction parallel to the axis of the shaft 4 in the photo to the size of the hole AD in the photo, and j is the ratio of the size of the hole 5 in the direction perpendicular to the axis of the shaft 4 in the photo to the size of the hole 5 in the photo to the size of the hole AB in the photo; wherein, the photo in step S4 is a photo including the hole 5 among the several photos in step S1.
Since the device is substantially parallel to the axis of the well bore 4, the line AD of point sources 22 parallel to the axis of the well bore 4 is the projected line a 'D' =ad of points on the well wall.
The following are specific measurement cases:
as shown in fig. 5 and 6, shooting was performed under a=41.5° condition, and ab=ad=15 mm, r=57.15 mm. Measured by a measuring optical ruler, z in a photo max =91.86mm，z min =22.44mm。l H =0, then calculate=4.09。
Substituting the formula in step S3 calculates a 'B' =16.42 mm.
In the photograph of fig. 4, the pixels of the area surrounded by the measuring tape 23 are 189×189, the pixels of the holes 5 in the direction parallel to the axis of the well bore 4 are 93, and the pixels of the holes 5 in the direction perpendicular to the axis of the well bore 4 are 52.
In fig. 6, the true dimension x=k×ad= (52/189) ×15 mm=4.13 mm of the borehole 5 parallel to the axis of the wellbore 4. The true dimension of the borehole 5 perpendicular to the axis of the wellbore 4 is y=j×a 'B' = (93/189) ×16.42 mm=8.08 mm.
The invention is not limited to the above-described alternative embodiments, and any person who may derive other various forms of products in the light of the present invention, however, any changes in shape or structure thereof, all falling within the technical solutions defined in the scope of the claims of the present invention, fall within the scope of protection of the present invention.
Claims (6)
1. A method for measuring the size of a borehole wall aperture with a positioning function, which is characterized in that a borehole wall aperture size measuring device with a positioning function is used: the device comprises an underground tool unit (1), wherein the other end of the underground tool unit (1) is rotationally connected with a measuring optical ruler nipple (2), and the other end of the measuring optical ruler nipple (2) is connected with a positioning optical ruler nipple (3); the positioning optical ruler pup joint (3) is provided with a plane light source for projecting a plane light beam (31) perpendicular to the axis of the shaft (4) and a cone light source for projecting a cone light beam (32) taking the axis of the shaft (4) as a central line; the measuring light ruler is characterized in that a lens (21) is arranged on the measuring light ruler pup joint (2), four point light sources (22) are arranged around the lens (21), light rays of the four point light sources (22) are parallel to each other, light points are projected on a well wall by the four point light sources (22), and a graph surrounded by the four light points is used as a measuring light ruler (23);
the method comprises the following steps:
s1: lowering a device consisting of a downhole tool unit (1), a measuring optical ruler pup joint (2) and a positioning optical ruler pup joint (3) into a well; the lens (21) photographs the plane light beam (31), the conical light beam (32) and the measuring light ruler (23) on the well wall by 360 degrees, and measures the maximum value and the minimum value of the distance between the plane light beam (31) and the conical light beam (32) in the photograph; the connecting lines of the four point light sources (22) are rectangular, and the side connecting lines of the four point light sources (22) are parallel to the axis of the shaft 4;
s2: calculation of；
Wherein l H Is the distance z between the vertex of the conical beam (32) and the planar beam (31) max Is the maximum value of the distance between the projection of the plane beam (31) and the cone beam (32) on the well wall in the photo; z min Is the minimum value of the distance between the projection of the plane beam (31) and the cone beam (32) on the well wall in the photo;
s3: calculating the projection distance of two point light sources (22) with connecting lines perpendicular to the axis of a shaft (4) on the well wall:
；
the lens (21) rotates from the position facing the axis of the shaft (4) to the position facing the hole (5) to be measured, the rotation angle is alpha, four point light sources (22) are A, B, C, D, AB is perpendicular to the axis of the shaft (4), AD is parallel to the axis of the shaft (4), the projection of AB on the shaft wall is A 'B', and R is the radius of the shaft (4);
s4: calculating the actual size of the hole (5), wherein the actual size x=k×ad of the hole (5) in the direction parallel to the axis of the well bore (4), and the actual size y=j×a 'B' of the hole (5) in the direction perpendicular to the axis of the well bore (4); wherein k is the ratio of the size of the hole (5) in the direction parallel to the axis of the shaft (4) in the picture to the size of the AD in the picture, and j is the ratio of the size of the hole (5) in the direction perpendicular to the axis of the shaft (4) in the picture to the size of the AB in the picture; wherein, the photo in step S4 is a photo including the hole (5) among the several photos in step S1.
2. The method for measuring borehole wall aperture size with positioning function as recited in claim 1, wherein in step S2, l H =0。
3. A method of borehole wall aperture measurement with positioning according to claim 1, characterized in that in step S1 the downhole tool unit (1) comprises a cable head (11), a first centralizer (12), a weight rod (13) and a second centralizer (14) connected in sequence, the measuring light gauge nipple (2) being connected to the end of the second centralizer (14) remote from the weight rod (13).
4. A borehole wall aperture size measurement method with positioning function according to claim 1, characterized in that the apex of the conical beam (32) is located on the plane of the planar beam (31).
5. The method for measuring the borehole wall aperture size with the positioning function according to claim 1, wherein the connecting lines of the four point light sources (22) are rectangular, and the side connecting lines of the four point light sources (22) are parallel to the axis of the shaft (4).
6. A borehole wall aperture size measurement method with positioning function according to claim 5, characterized in that the center of the line connecting two point light sources (22) diagonally coincides with the center of the lens (21).
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| CN202110394484.2A CN113175318B (en) | 2021-04-13 | 2021-04-13 | Borehole wall eyelet size measuring method with positioning function |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08218763A (en) * | 1995-02-13 | 1996-08-27 | Kajima Corp | Cracik measuring device in bore hole |
| JP2000121331A (en) * | 1998-10-13 | 2000-04-28 | Mitsutoyo Corp | Optical type hole shape measuring method and apparatus |
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| JPH08218763A (en) * | 1995-02-13 | 1996-08-27 | Kajima Corp | Cracik measuring device in bore hole |
| JP2000121331A (en) * | 1998-10-13 | 2000-04-28 | Mitsutoyo Corp | Optical type hole shape measuring method and apparatus |
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| CN108885167A (en) * | 2016-03-05 | 2018-11-23 | 米纳莱泽有限公司 | System and method for analyzing core sample |
| JP3207914U (en) * | 2016-09-28 | 2016-12-08 | 有限会社静岡フスマ商会 | Shape measurement device |
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