Ultrahigh-temperature and ultrahigh-pressure double-compensation double-lateral probe
By adopting step ring structure and double compensation device in the double-sided probe, combined with stainless steel support ring and PEEK material, the problem of seal failure of insulating ring under ultra-high temperature and ultra-high pressure is solved, and the probe is stable in high temperature and high pressure environment Accuracy of work and logging curves.
Patent Information
- Application Number
- CN202411272773.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-11
- Publication Date
- 2024-12-31
AI Technical Summary
The existing double-sided probes have problems such as insufficient heat resistance, easy corrosion and seal failure in ultra-high pressure environments, resulting in leakage and axial preload failure.
Adopt a design including circuit steel cylinder, intermediate joint, mandrel and lower steel cylinder, with electronic circuits and high-voltage sealing plugs inside, and an insulating ring and electrode ring with step ring structure outside, and through slotted tubes and spiral tubes Double compensation device, combined with stainless steel support ring and PEEK material insulated ring, ensures sealing and pre-tightening under high temperature and high pressure.
It achieves long-term stable operation in an environment of 230℃ and 206MPa, avoids leakage and loosening, and ensures the accuracy of formation resistivity measurement.
Smart Images
Figure CN119221907A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the field of petroleum well logging, and in particular relates to a dual lateral probe in the field which can be used for a long time in an ultra-high temperature and ultra-high pressure environment. Background Art
[0002] The dual lateral probe is an instrument for measuring the resistivity of formations in open-hole wells in oil fields and one of the main equipment for implementing resistivity logging methods. It can simultaneously measure the resistivity of the invasion zone and the original formation at two different detection depths. Researchers can analyze the resistivity changes between formations based on its measurement data.
[0003] like Figure 1 As shown, an insulating ring is usually arranged between the electrode rings of the double lateral probe, and the existing insulating ring is usually made of glass fiber reinforced plastics or PEEK materials. Due to the limitation of instrument size, the sealing groove of the existing double lateral probe is directly processed on the sealing surface of the insulating ring. After being used in ultra-high temperature and ultra-high pressure wells, a series of problems are exposed, such as the insulating ring made of glass fiber reinforced plastics cannot withstand ultra-high temperatures and is easily corroded by acids and alkalis in the well. After measuring ultra-high temperature and ultra-high pressure wells, the radial sealing surface size of the insulating ring made of PEEK will shrink, resulting in instrument leakage, and the axial size will be shortened, resulting in pre-tightening failure, looseness between the insulating ring and the electrode ring, etc.
[0004] According to the survey, the insulation materials currently used in the oil well logging industry are still roughly the above types, and no new, revolutionary alternative insulation materials have emerged for the time being. Summary of the invention
[0005] The technical problem to be solved by the present invention is to provide an ultra-high temperature and ultra-high pressure double-compensation double-lateral probe.
[0006] The present invention adopts the following technical solution: An ultra-high temperature and ultra-high pressure double compensation double lateral probe, the improvement of which is that: it comprises a circuit steel cylinder, an intermediate joint, a core shaft and a lower steel cylinder connected together, an electronic circuit is arranged in the circuit steel cylinder, an insulating sleeve is sleeved on the outer wall of the intermediate joint, an axial wiring groove is provided in the core shaft, a high-voltage sealing plug is arranged at one end of the wiring groove adjacent to the intermediate joint, and a high-voltage male connector is arranged at one end adjacent to the lower steel cylinder, a through-conducting wire led out of the electronic circuit is led to the high-voltage male connector through the high-voltage sealing plug, a string of electrodes and insulating rings are sleeved on the outside of the core shaft, and the above-mentioned electrodes and insulating rings are pressed against the insulating sleeve on the outer wall of the intermediate joint by a positioning sleeve and a clamping nut; The electrodes and insulating rings include a first insulating ring, an upper A1* electrode ring, an upper A1* insulating ring assembly, a first upper A1 electrode ring, a second upper A1 electrode ring, a first lower A1 electrode ring, a second lower A1 electrode ring, a lower A1* insulating ring assembly, a lower A1* electrode ring, a second insulating ring, and a third insulating ring, which are connected in sequence, and the contact surfaces therebetween are sealed by a sealing ring; The first upper A1 electrode ring, the second upper A1 electrode ring, the second insulating ring and the third insulating ring are step ring structures with a thick front and a thin back, a compensation gap is reserved between the front step rings of the first upper A1 electrode ring and the second upper A1 electrode ring, a grooved tube is arranged in the gap between the rear step rings, and a spiral tube is arranged in the gap between the second insulating ring and the rear step ring of the third insulating ring; The upper A1* insulating ring assembly includes an upper A1* insulating ring and a large support ring, the large support ring is embedded in the inner hole of the upper A1* insulating ring, a protrusion is set on the outer side of the upper A1* insulating ring, and the two sides of the protrusion are respectively connected to the upper A1* electrode ring and the first upper A1 electrode ring; the lower A1* insulating ring assembly includes a lower A1* insulating ring and a small support ring, the small support ring is embedded in the inner hole of the lower A1* insulating ring, a protrusion is set on the outer side of the lower A1* insulating ring, and the two sides of the protrusion are respectively connected to the second lower A1 electrode ring and the lower A1* electrode ring.
[0007] Furthermore, the middle joint and the core shaft are mechanically connected via a clamping block.
[0008] Furthermore, one end of the circuit steel cylinder is connected to the middle joint through a threaded ring, and the other end is connected to the upper protective cap; one end of the lower steel cylinder is connected to the core shaft through a threaded ring, and the other end is connected to the lower plug.
[0009] Furthermore, high-temperature glass fiber reinforced plastic is wound around the outer wall of the core shaft.
[0010] Furthermore, an insulating sleeve is sleeved outside the positioning sleeve and the clamping nut.
[0011] Furthermore, the interior of the probe is filled with silicone oil, and an oil filling assembly, an exhaust screw, a balance piston, a piston compression spring, a safety valve and a relief valve are arranged on the probe.
[0012] Furthermore, the upper A1* electrode ring, the first upper A1 electrode ring, the second upper A1 electrode ring, the first lower A1 electrode ring, the second lower A1 electrode ring, and the lower A1* electrode ring are all metal rings, each metal ring is insulated and independent from each other, and is electrically connected to the electronic circuit through electrode leads.
[0013] Furthermore, the first insulating ring, the upper A1* insulating ring, the lower A1* insulating ring, the second insulating ring, and the third insulating ring are all insulating rings made of PEEK material.
[0014] Furthermore, alternate square grooves and stress relief holes are engraved on the grooved tube; and a spiral groove is engraved on the spiral tube.
[0015] Furthermore, the material of the large support ring is stainless steel, and there is an interference fit between the large support ring and the inner hole of the upper A1* insulating ring. The material of the small support ring is stainless steel, and there is an interference fit between the small support ring and the inner hole of the lower A1* insulating ring.
[0016] The beneficial effects of the present invention are: The ultra-high temperature and ultra-high pressure dual-compensation dual-lateral logging probe disclosed in the present invention can work stably for a long time in an ultra-high temperature and ultra-high pressure environment of 230°C and 206MPa, and obtain qualified dual-lateral logging curves. It overcomes the radial sealing failure leakage and axial pre-tightening failure problems caused by the limitations of existing insulating materials, avoids loosening between the insulating ring and the electrode ring due to pre-tightening failure, and can provide resistivity change curves from the formation invasion zone to the original formation for ultra-deep well detection. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is a schematic diagram of radial leakage and axial loosening of the existing double lateral probe; Figure 2 is a schematic diagram of an axial section of the probe disclosed in the present invention; Figure 3 It is a schematic diagram of the installation positions of the grooved tube and the spiral tube in the probe disclosed in the present invention; Figure 4 It is a schematic diagram of the structure of the grooved tube in the probe disclosed in the present invention; Figure 5 It is a structural schematic diagram of the spiral tube in the probe disclosed by the present invention; Figure 6 It is a schematic diagram of the installation position of the upper A1* insulating ring assembly in the probe disclosed in the present invention; Figure 7 It is a structural schematic diagram of the upper A1* insulating ring assembly in the probe disclosed in the present invention; Figure 8 It is a structural schematic diagram of the lower A1* insulating ring assembly in the probe disclosed in the present invention; Fig. 9 This is a diagram showing the effect of double compensation of the grooved tube and the spiral tube in the probe disclosed by the present invention.
[0018] Reference numerals: 1—electronic circuit; 2—upper A1*insulating ring assembly; 3—lower A1*insulating ring assembly; 4—safety valve; 5—overflow valve; 6—first insulating ring; 7—second insulating ring; 8—third insulating ring; 9—upper A1*electrode ring; 10—first upper A1 electrode ring; 11—second upper A1 electrode ring; 12—first lower A1 electrode ring; 13—second lower A1 electrode ring; 14—lower A1*electrode ring; 15—grooved tube; 16—spiral tube; 17—positioning sleeve; 18—pressing nut; 19—circuit steel cylinder ;20—lower steel cylinder;21—core shaft;22—middle joint;23—oil filling assembly;24—exhaust screw;25—balance piston;26—piston compression spring;27—upper protective cap;28—lower plug;29—insulating sleeve;30—sealing ring and retaining ring;31—high temperature fiberglass;32—high pressure sealing plug;33—high pressure male connector;34—upper A1* insulating ring;35—lower A1* insulating ring;36—large support ring;37—small support ring;38—compensation gap;39—reverse compensation gap; DETAILED DESCRIPTION
[0019] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.
[0020] In this embodiment, Figure 2 For example, axial direction refers to the length direction, radial direction refers to the width direction, front refers to the left side, and rear and end refer to the right side.
[0021] Embodiment 1, this embodiment discloses an ultra-high temperature and ultra-high pressure double compensation double lateral probe, such as Figure 2 As shown, it includes a circuit steel cylinder 19, an intermediate joint 22, a core shaft 21 and a lower steel cylinder 20 connected together. The intermediate joint and the core shaft are mechanically connected by a clamping block. One end of the circuit steel cylinder is connected to the intermediate joint through a threaded ring, and the other end is connected to the upper protective cap 27; one end of the lower steel cylinder is connected to the core shaft through a threaded ring, and the other end is connected to the lower plug 28. The probe is filled with silicone oil, and an oil filling assembly 23, an exhaust screw 24, a balancing piston 25 for pressure balance, a piston compression spring 26, a safety valve 4, and a relief valve 5 are arranged on the probe.
[0022] An electronic circuit 1 is arranged in the circuit steel cylinder, an insulating sleeve 29 is sleeved on the outer wall of the middle joint, an axial wiring groove is opened in the core shaft, a high-voltage sealing plug 32 is arranged at one end of the wiring groove adjacent to the middle joint, and a high-voltage male connector 33 is arranged at the end adjacent to the lower steel cylinder, and the through wire led out from the electronic circuit is led to the high-voltage male connector through the high-voltage sealing plug.
[0023] A high-temperature glass fiber reinforced plastic 31 of a certain thickness is wound on the outer wall of the core shaft, and a string of electrodes and insulating rings are sleeved on the outside of the core shaft. At the ends of the electrodes and insulating rings, positioning sleeves 17 and clamping nuts 18 are used to tighten the above-mentioned electrodes and insulating rings to the insulating sleeve on the outer wall of the intermediate joint, that is, the positioning sleeves and clamping nuts are used to pre-tighten the electrodes and insulating rings, and an insulating sleeve 29 is sleeved on the outside of the positioning sleeves and clamping nuts.
[0024] The electrodes and insulating rings include a first insulating ring 6, an upper A1* electrode ring 9, an upper A1* insulating ring assembly 2, a first upper A1 electrode ring 10, a second upper A1 electrode ring 11, a first lower A1 electrode ring 12, a second lower A1 electrode ring 13, a lower A1* insulating ring assembly 3, a lower A1* electrode ring 14, a second insulating ring 7, and a third insulating ring 8, which are connected in sequence, and the contact surfaces therebetween are sealed by a sealing ring and a retaining ring 30; The upper A1* electrode ring, the first upper A1 electrode ring, the second upper A1 electrode ring, the first lower A1 electrode ring, the second lower A1 electrode ring, and the lower A1* electrode ring are all metal rings, each metal ring is insulated and independent from each other, and is electrically connected to the electronic circuit through electrode leads.
[0025] The first insulating ring, the upper A1* insulating ring, the lower A1* insulating ring, the second insulating ring and the third insulating ring are all insulating rings made of PEEK material.
[0026] like Figure 3 As shown, the first upper A1 electrode ring, the second upper A1 electrode ring, the second insulating ring and the third insulating ring are step ring structures with a thick front and a thin back. A compensation gap 38 is reserved between the front step rings of the first upper A1 electrode ring and the second upper A1 electrode ring, and a grooved tube 15 is arranged in the gap between the rear step rings, as shown in FIG. Figure 4 As shown, the grooved tube is engraved with alternating square grooves and stress relief holes; a spiral tube 16 is arranged in the gap between the second insulating ring and the rear step ring of the third insulating ring, as shown in FIG. Figure 5 As shown in the figure, a spiral groove is engraved on the spiral tube; the double compensation device composed of the grooved tube and the spiral tube compensates for the different deformations of the insulating ring and the electrode ring caused by thermal expansion and contraction through combined deformation. It can ensure that the axial preload of the probe electrode and the insulating ring is in an effective state under any environmental conditions, and will not cause loosening between the insulating ring and the electrode ring due to preload failure.
[0027] like Figure 6, as shown in FIG. 7 , the upper A1* insulating ring assembly includes an upper A1* insulating ring 34 and a large support ring 36, the large support ring is embedded in the inner hole of the upper A1* insulating ring, a protrusion is set on the outer side of the upper A1* insulating ring, and the two sides of the protrusion are respectively connected to the upper A1* electrode ring and the first upper A1 electrode ring, and the sealing form adopts a piston rod seal, and the sealing ring is respectively located in the inner sealing groove of the upper A1* electrode ring and the first upper A1 electrode ring. Figure 8 As shown, the lower A1* insulating ring assembly includes a lower A1* insulating ring 35 and a small support ring 37. The small support ring is embedded in the inner hole of the lower A1* insulating ring. A protrusion is set on the outer side of the lower A1* insulating ring. The two sides of the protrusion are respectively connected to the second lower A1 electrode ring and the lower A1* electrode ring. The large support ring and the small support ring can limit the radial displacement of the upper A1* insulating ring and the lower A1* insulating ring due to temperature changes, ensure the effectiveness of radial sealing, and avoid radial leakage of the probe.
[0028] The material of the large support ring is stainless steel. There is an interference fit between the large support ring and the inner hole of the upper A1* insulating ring, which is equivalent to adding a metal support ring to the inner hole of the upper A1* insulating ring, and the outer circle of the upper A1* insulating ring is a sealing surface. During oil logging, when the probe reaches the target layer and works in a high temperature and high pressure environment, the upper A1* insulating ring expands and deforms radially toward the outer ring. Since the upper A1* electrode ring limits the outward expansion and deformation of the upper A1* insulating ring, the upper A1* insulating ring has no radial expansion space and can only be squeezed axially with expansion space. At this time, the radial seal is reliable, and the probe reaches a stable state and continues to work. After the logging is completed and reaches room temperature, the upper A1* insulating ring will shrink radially toward the inner ring. At this time, the large support ring limits the shrinkage of the upper A1* insulating ring toward the inner ring, ensuring the sealing fit gap between the upper A1* insulating ring and the upper A1* electrode ring, so that the probe will not leak radially.
[0029] The material of the small support ring is stainless steel, and there is an interference fit between the small support ring and the inner hole of the lower A1* insulating ring, which is equivalent to adding a metal support ring to the inner hole of the lower A1* insulating ring. The radial anti-leakage principle of the lower A1* insulating ring assembly is the same as that of the upper A1* insulating ring assembly, which will not be repeated here.
[0030] After the double compensation device disclosed in this embodiment is installed in place, under the action of the pre-tightening force, the grooved tube can produce a smaller elastic deformation (axial displacement), and the spiral tube can produce a larger elastic deformation (axial displacement). When the positioning sleeve and the clamping nut are installed in place, a compensation gap can be formed between the first upper A1 electrode ring and the second upper A1 electrode ring by utilizing the combined deformation of the grooved tube and the spiral tube. At this time, the spiral tube has produced a relatively large elastic deformation (axial displacement) and stored a large amount of energy.
[0031] After the probe reaches the target layer and works in a high temperature and high pressure environment, the thermal expansion deformation of the insulating ring is greater than the thermal expansion deformation of the metal ring, and the grooved tube continues to be compressed and produces elastic deformation (axial displacement) until the compensation gap left during assembly completely disappears. At this time, the probe reaches a stable state and continues to work. When lifting up for logging, as the temperature and pressure decrease, both the insulating ring and the metal ring begin to shrink. The shrinkage of the insulating ring is also greater than that of the metal ring. During this process, the grooved tube will slowly pop open, and the compensation gap will slowly recover. The insulating ring and the metal ring are always in a pre-tightened state and will not loosen. When the logging is completed and reaches room temperature or even lower ambient temperature, the insulating ring made of PEEK material will continue to shrink, and the compensation amount of the grooved tube can no longer meet the pre-tightening requirements. At this time, the spiral tube will slowly pop open, creating a gap between the second insulating ring and the third insulating ring. Fig. 9 The reverse compensation gap 39 shown, because the spiral tube has previously produced a large elastic deformation (axial displacement) and stored a large amount of energy, can always generate a relatively large elastic force during the process of the reverse compensation gap 39 to ensure that all metal rings and insulating rings are always in a pre-tightened state and do not loosen.
Claims
1. An ultra-high temperature and ultra-high pressure dual compensation dual lateral probe, characterized in that: It includes a circuit steel cylinder, an intermediate joint, a core shaft and a lower steel cylinder connected together, an electronic circuit is arranged in the circuit steel cylinder, an insulating sleeve is sleeved on the outer wall of the intermediate joint, an axial wiring groove is provided in the core shaft, a high-voltage sealing plug is arranged at one end of the wiring groove adjacent to the intermediate joint, and a high-voltage male connector is arranged at one end adjacent to the lower steel cylinder, a through-wire drawn from the electronic circuit is led to the high-voltage male connector through the high-voltage sealing plug, a string of electrodes and insulating rings are sleeved on the outside of the core shaft, and the above-mentioned electrodes and insulating rings are pressed tightly against the insulating sleeve on the outer wall of the intermediate joint by a positioning sleeve and a clamping nut; The electrodes and insulating rings include a first insulating ring, an upper A1* electrode ring, an upper A1* insulating ring assembly, a first upper A1 electrode ring, a second upper A1 electrode ring, a first lower A1 electrode ring, a second lower A1 electrode ring, a lower A1* insulating ring assembly, a lower A1* electrode ring, a second insulating ring, and a third insulating ring, which are connected in sequence, and the contact surfaces therebetween are sealed by a sealing ring; The first upper A1 electrode ring, the second upper A1 electrode ring, the second insulating ring and the third insulating ring are step ring structures with a thick front and a thin back, a compensation gap is reserved between the front step rings of the first upper A1 electrode ring and the second upper A1 electrode ring, a grooved tube is arranged in the gap between the rear step rings, and a spiral tube is arranged in the gap between the second insulating ring and the rear step ring of the third insulating ring; The upper A1* insulating ring assembly includes an upper A1* insulating ring and a large support ring, the large support ring is embedded in the inner hole of the upper A1* insulating ring, a protrusion is set on the outer side of the upper A1* insulating ring, and the two sides of the protrusion are respectively connected to the upper A1* electrode ring and the first upper A1 electrode ring; the lower A1* insulating ring assembly includes a lower A1* insulating ring and a small support ring, the small support ring is embedded in the inner hole of the lower A1* insulating ring, a protrusion is set on the outer side of the lower A1* insulating ring, and the two sides of the protrusion are respectively connected to the second lower A1 electrode ring and the lower A1* electrode ring.
2. The ultra-high temperature and ultra-high pressure dual-compensation dual-lateral probe according to claim 1, characterized in that: The intermediate joint and the core shaft are mechanically connected through a clamping block.
3. The ultra-high temperature and ultra-high pressure dual-compensation dual-lateral probe according to claim 1, characterized in that: One end of the circuit steel cylinder is connected to the middle joint through a threaded ring, and the other end is connected to the upper protective cap; one end of the lower steel cylinder is connected to the core shaft through a threaded ring, and the other end is connected to the lower plug.
4. The ultra-high temperature and ultra-high pressure dual-compensation dual-lateral probe according to claim 1, characterized in that: High temperature fiberglass is also wound around the outer wall of the mandrel.
5. The ultra-high temperature and ultra-high pressure dual-compensation dual-lateral probe according to claim 1, characterized in that: An insulating sleeve is sleeved on the outside of the positioning sleeve and the locking nut.
6. The ultra-high temperature and ultra-high pressure dual-compensation dual-lateral probe according to claim 1, characterized in that: The inside of the probe is filled with silicone oil, and an oil filling assembly, an exhaust screw, a balance piston, a piston compression spring, a safety valve and a relief valve are arranged on the probe.
7. The ultra-high temperature and ultra-high pressure dual-compensation dual-lateral probe according to claim 1, characterized in that: The upper A1* electrode ring, the first upper A1 electrode ring, the second upper A1 electrode ring, the first lower A1 electrode ring, the second lower A1 electrode ring, and the lower A1* electrode ring are all metal rings, each metal ring is insulated and independent from each other, and is electrically connected to the electronic circuit through electrode leads.
8. The ultra-high temperature and ultra-high pressure dual-compensation dual-lateral probe according to claim 1, characterized in that: The first insulating ring, the upper A1* insulating ring, the lower A1* insulating ring, the second insulating ring and the third insulating ring are all insulating rings made of PEEK material.
9. The ultra-high temperature and ultra-high pressure dual-compensation dual-lateral probe according to claim 1, characterized in that: The grooved tube has alternating square grooves and stress relief holes; the spiral tube has a single spiral groove.
10. The ultra-high temperature and ultra-high pressure dual-compensation dual-lateral probe according to claim 1, characterized in that: The material of the large support ring is stainless steel, and there is an interference fit between the large support ring and the inner hole of the upper A1* insulating ring. The material of the small support ring is stainless steel, and there is an interference fit between the small support ring and the inner hole of the lower A1* insulating ring.