Method for detecting magnetic field gradient of non-magnetic drilling tool with inner hole positioning function

Abstract

The invention relates to a non-magnetic drilling tool magnetic field gradient detection method with an inner hole positioning function. The non-magnetic drilling tool with the inner hole positioning function is provided with a magnetic field gradient probe with the inner hole positioning function, a non-magnetic material cylinder with the diameter being 30 mm is arranged in the probe, magnetic flux gate coils with the distance being 100 mm are packaged in the probe along the center axis of the cylinder, and three supporting seats evenly distributed around the circumference by 120 degrees are fixed to the surface of the cylinder; the supporting seat is connected with one end of each supporting arm through a shaft, the lengths of the three supporting arms are consistent, the lengths of the supporting arms adapt to the diameters of inner holes of non-magnetic drilling tools of different specifications, and the supporting arms with magnetic field gradients are adjusted and synchronously expand or contract to adapt to different hole diameters of the non-magnetic drilling tools; it is ensured that the magnetic field gradient probe is centered within the range of 3 mm (1 / 8 '') of the axis of the non-magnetic drilling tool, and magnetic field testing of the non-magnetic drilling tool is completed.

Description

Technical Field

[0001] The invention belongs to the technical field of magnetic field detection of non-magnetic drilling tools, and in particular relates to a magnetic field gradient detection method of a non-magnetic drilling tool with an inner hole positioning function. Background Art

[0002] The 140. Non-magnetic material testing section of the NS-1 petroleum drilling tool standard system document requires that the magnetic field gradient probe be centered within 3mm (1 / 8”) of the axis of the non-magnetic drilling tool. In the actual detection process, the non-magnetic gradient probe generally does not have the corresponding inner hole positioning function. During the magnetic field gradient test of the non-magnetic drilling tool, the non-magnetic drilling tool axis position deviates or shakes, and the magnetic field gradient detection of the non-magnetic drilling tool cannot be accurately carried out. For non-magnetic drilling tools of different apertures, a non-magnetic drilling tool magnetic field gradient detection method with inner hole positioning function is required to ensure accurate magnetic field gradient detection of non-magnetic drilling tools. Summary of the invention

[0003] The purpose of the present invention is to overcome the problem that the existing non-magnetic gradient probe does not have the corresponding positioning function and cannot accurately carry out magnetic field gradient detection of non-magnetic drilling tools, and to provide a non-magnetic drilling tool magnetic field gradient detection method with inner hole positioning function.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is as follows: a magnetic field gradient detection method for a non-magnetic drilling tool with an inner hole positioning function, the steps of which are as follows: Step 1) Design a magnetic field gradient probe with inner hole positioning function. The inside of the probe is a non-magnetic material cylinder with a diameter of 30 mm, and magnetic flux gate coils are packaged inside along the central axis of the cylinder with a distance of 100 mm; Step 2), three support seats evenly distributed around the circumference at 120° are fixed on the surface of one end of the cylinder, the support seat is connected to one end of the support arm through a shaft, the three support arms are of the same length, and the length of the support arm is adapted to the inner hole diameter of non-magnetic drilling tools of different specifications; the other end of each support arm has a roller; each support arm is connected to a support arm sleeve through a hinge, the support arm sleeve is sleeved on the outer surface of the cylinder, and the support arm sleeve and the internal thread adjustment sleeve are nested together; the internal thread adjustment sleeve is screwed with the thread on the other end surface of the cylinder through the internal thread; the internal thread adjustment sleeve is rotated on the surface of the cylinder, the internal thread adjustment sleeve drives the support arm sleeve to move linearly, and the hinge drives the three support arms to open or contract synchronously; the above materials are all non-magnetic materials; Step 3) Place the magnetic field gradient probe into the inner hole of the non-magnetic drill, rotate the internal threaded adjustment sleeve on the surface of the cylinder to drive the support arm sleeve to move linearly, open the three support arms through the hinge, and the rollers at the ends of the support arms are against the inner hole wall of the non-magnetic drill; adjust the support arms according to different hole diameters to ensure that the magnetic field gradient probe is centered within 3mm (1 / 8”) of the axis of the non-magnetic drill; Step 4) During the test, the non-magnetic drill tool moves linearly, and the magnetic field gradient probe remains stable and motionless in the inner hole of the non-magnetic drill tool together with the fixed probe traction rod, thereby completing the magnetic field gradient test of the non-magnetic drill tool.

[0005] The present invention has the following beneficial effects: a method for detecting the magnetic field gradient of a non-magnetic drill with an inner hole positioning function, which adapts to different apertures of the non-magnetic drill by adjusting the support arm, ensures that the magnetic field gradient probe is centered within 3mm (1 / 8") of the axis of the non-magnetic drill, and completes accurate testing of the magnetic field gradient of the non-magnetic drill. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 It is a structural schematic diagram of the magnetic field gradient probe with inner hole positioning function of the present invention.

[0007] Figure 2 It is a schematic diagram of magnetic field gradient detection of the non-magnetic drilling tool of the present invention.

[0008] Figure 3 It is a structural schematic diagram of the magnetic field gradient probe with inner hole positioning function of the present invention when performing magnetic field gradient detection of non-magnetic drilling tools.

[0009] In the figure, 1 is the internal thread adjustment sleeve; 2 is the support arm sleeve; 3 is the roller; 4 is the support arm; 5 is the hinge chain; 6 is a magnetic flux gate coil; 7 is a support seat; 8 is a cylinder; 9 is a non-magnetic drilling tool; 10 is a magnetic field gradient probe, 11 is a probe traction rod, DETAILED DESCRIPTION

[0010] Embodiment 1: A method for detecting magnetic field gradient of a non-magnetic drilling tool with an inner hole positioning function, the steps of which are as follows: Step 1), firstly design a magnetic field gradient probe 10 with an inner hole positioning function, the inside of the probe is a cylinder 8 of non-magnetic material with a diameter of 30mm, and the magnetic flux gate coils 6 are packaged inside along the central axis of the cylinder at a distance of 100mm; Step 2), three support seats 7 are fixed on the surface of one end of the cylinder 8, which are evenly distributed around the circumference at 120°. The support seat 7 is connected to one end of the support arm 4 through an axis. The lengths of the three support arms 4 are consistent, and the lengths of the support arms 4 are adapted to the inner hole diameters of non-magnetic drilling tools of different specifications; there is a roller 3 at the other end of each support arm 4; each support arm 4 is connected to the support arm sleeve 2 through a hinge 5, and the support arm sleeve 2 is sleeved on the outer surface of the cylinder 8, and the support arm sleeve 2 is nested with the internal thread adjustment sleeve 1; the internal thread adjustment sleeve 1 is threadedly engaged with the other end surface of the cylinder 8 through the internal thread; the internal thread adjustment sleeve 1 rotates on the surface of the cylinder 8, and the internal thread adjustment sleeve 1 drives the support arm sleeve 2 to move linearly, and the hinge 5 drives the three support arms 4 to open or contract synchronously; the above materials are all non-magnetic materials; Step 3), place the magnetic field gradient probe 10 into the inner hole of the non-magnetic drill 9, rotate the internal thread adjustment sleeve 1 on the surface of the cylinder 8 to drive the support arm sleeve 2 to move linearly, open the three support arms 4 through the hinge 5, and the roller 3 at the end of the support arm 4 is against the inner hole wall of the non-magnetic drill; adjust the support arm 4 according to different apertures to ensure that the magnetic field gradient probe 10 is centered within 3mm (1 / 8") of the axis of the non-magnetic drill; Step 4), during the test, the non-magnetic drill tool 9 moves linearly, and the magnetic field gradient probe 10 remains stable and motionless with the fixed probe traction rod 11 in the inner hole of the non-magnetic drill tool 9, completing the magnetic field gradient test of the non-magnetic drill tool 9.

[0011] The magnetic field gradient probe with inner hole positioning function is a cylinder with a diameter of 30 mm, and a magnetic flux gate 100 mm apart is encapsulated inside along the central axis of the cylinder. There are three support arms of the same length evenly distributed around the circumference at 120° on the surface of the cylinder. The length of the support arm is adapted to the inner hole diameter of non-magnetic drilling tools of different specifications. There is a roller at the end of each support arm. Each support arm is connected to the support arm sleeve through a hinge, and the support arm sleeve is screwed together with the internal thread adjustment sleeve. The support arm sleeve and the internal thread adjustment sleeve are on the surface of the cylinder. The above materials are all non-magnetic materials.

[0012] How to use: Place the magnetic field gradient probe into the inner hole of the non-magnetic drill, rotate the internal thread adjustment sleeve to drive the support arm sleeve to move linearly, open the three support arms through the hinge, and the rollers at the ends of the support arms are against the inner hole wall of the non-magnetic drill. For different hole diameters, the support arms can be adjusted to ensure that the magnetic field gradient probe is centered within 3mm (1 / 8”) of the axis of the non-magnetic drill. During the test, the non-magnetic drill moves linearly, and the magnetic field gradient probe remains stable in the inner hole of the non-magnetic drill with the fixed probe traction rod, completing the magnetic field test of the non-magnetic drill.

[0013] The magnetic field gradient probe 7 with inner hole positioning function is a cylinder with a diameter of 30 mm, and a magnetic flux gate 6 with a distance of 100 mm is encapsulated inside along the central axis of the cylinder. There are three support arms 4 of the same length uniformly distributed around the circumference at 120° on the surface of the cylinder. The length of the support arm is adapted to the inner hole diameter of non-magnetic drilling tools of different specifications. There is a roller 3 at the end of each support arm 4. Each support arm 4 is connected to the support arm sleeve 2 through a hinge 5, and the support arm sleeve 2 is screwed together with the internal thread adjustment sleeve 1. The support arm sleeve 2 and the internal thread adjustment sleeve 1 are on the surface of the cylinder.

[0014] Place the magnetic field gradient probe 7 into the inner hole of the non-magnetic drill 9, rotate the internal thread adjustment sleeve 1 to drive the support arm sleeve 2 to move linearly, open the three support arms 4 through the hinge 5, and the roller 3 at the end of the support arm 4 is against the inner hole wall of the non-magnetic drill. For different hole diameters, the support arm can be adjusted to ensure that the magnetic field gradient probe is centered within 3mm (1 / 8”) of the axis of the non-magnetic drill.

[0015] During the test, the non-magnetic drill tool 9 moves linearly, and the magnetic field gradient probe 7 remains stable and motionless with the fixed probe traction rod 8 in the inner hole of the non-magnetic drill tool, thereby completing the magnetic field test of the non-magnetic drill tool 9.

Claims

1. A method for detecting magnetic field gradient of a non-magnetic drilling tool with inner hole positioning function, characterized in that: The steps are as follows: Step 1) First, design a magnetic field gradient probe with inner hole positioning function. The probe has a non-magnetic material cylinder with a diameter of 30 mm, and magnetic flux gate coils are packaged inside the cylinder with a distance of 100 mm along the central axis; Step 2), three support seats evenly distributed around the circumference at 120° are fixed on the surface of one end of the cylinder, the support seat is connected to one end of the support arm through a shaft, the three support arms are of the same length, and the length of the support arm is adapted to the inner hole diameter of non-magnetic drilling tools of different specifications; the other end of each support arm has a roller; each support arm is connected to a support arm sleeve through a hinge, the support arm sleeve is sleeved on the outer surface of the cylinder, and the support arm sleeve and the internal thread adjustment sleeve are nested together; the internal thread adjustment sleeve is screwed with the thread on the other end surface of the cylinder through the internal thread; the internal thread adjustment sleeve is rotated on the surface of the cylinder, the internal thread adjustment sleeve drives the support arm sleeve to move linearly, and the hinge drives the three support arms to open or contract synchronously; the above materials are all non-magnetic materials; Step 3) Place the magnetic field gradient probe into the inner hole of the non-magnetic drill, rotate the internal threaded adjustment sleeve on the surface of the cylinder to drive the support arm sleeve to move linearly, open the three support arms through the hinge, and the rollers at the ends of the support arms are against the inner hole wall of the non-magnetic drill; adjust the support arms according to different hole diameters to ensure that the magnetic field gradient probe is centered within 3mm (1 / 8”) of the axis of the non-magnetic drill; Step 4) During the test, the non-magnetic drill tool moves linearly, and the magnetic field gradient probe remains stable and motionless in the inner hole of the non-magnetic drill tool together with the fixed probe traction rod, thereby completing the magnetic field gradient test of the non-magnetic drill tool.

Images