Ultrahigh-temperature and ultrahigh-pressure double-compensation double-lateral probe
By using the design of circuit steel cylinder, insulating sleeve and double compensation device in the double-sided probe, the problem of sealing and preloading failure of the insulating ring in ultra-high temperature and ultra-high pressure environment is solved, and the effect of the probe working stably for a long time under high temperature and high pressure is achieved.
Patent Information
- Application Number
- CN202422228908.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-11
- Publication Date
- 2025-06-10
- Estimated Expiration
- 2034-09-11
AI Technical Summary
When used in ultra-high temperature and ultra-high pressure environments, the insulating ring material cannot withstand high temperatures and is prone to corrosion, resulting in seal failure and preload failure, affecting the accuracy of logging.
A probe design including circuit steel cylinder, intermediate joint, mandrel and lower steel cylinder is adopted. An insulating sleeve is set on the outer wall of the intermediate joint, and a trace groove and high-pressure sealing plug are set inside the mandrel. Combined with a double compensation device of the grooved tube and the spiral tube, it ensures that the insulating ring and electrode ring are effectively pre-tightened under high temperature and high pressure.
In an ultra-high temperature and ultra-high pressure environment of 230℃ and 206MPa, the probe can work stably for a long time, avoiding the problems of seal failure and preload failure, and ensuring the accuracy of the logging curve.
Smart Images
Figure CN222962850U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the field of oil well logging, and particularly relates to a dual laterolog probe that can be applied for a long time in an ultra-high temperature and ultra-high pressure environment in this field. Background Technique
[0002] A dual laterolog probe is an instrument for measuring the formation resistivity of oilfield open-hole wells and is one of the main devices for implementing the resistivity logging method. It can simultaneously measure the resistivities of two different detection depths, namely the resistivity of the formation invasion zone and the resistivity of the virgin formation. Researchers can analyze the resistivity changes between formations based on the measurement data.
[0003] As Figure 1 shown, an insulating ring is usually arranged between the electrode rings of the dual laterolog probe. The existing insulating rings are usually made of fiberglass or PEEK materials. Limited by the instrument size, the sealing grooves of the existing dual laterolog probes are directly machined on the sealing surfaces of the insulating rings. After being used in ultra-high temperature and ultra-high pressure wells, a series of problems are exposed. For example, the insulating ring made of fiberglass material cannot withstand ultra-high temperature and is easily corroded by acids and alkalis in the well. After measuring an ultra-high temperature and ultra-high pressure well, the radial sealing surface size of the PEEK material insulating ring will shrink, resulting in instrument leakage, and the axial dimension will shorten, resulting in preloading failure, and loosening between the insulating ring and the electrode ring, etc.
[0004] According to research, the insulating materials currently used in the oil well logging industry are roughly the above several types, and there is no new and revolutionary alternative insulating material yet. Content of the Utility Model
[0005] The technical problem to be solved by the utility model is to provide an ultra-high temperature and ultra-high pressure dual compensation dual laterolog probe.
[0006] The utility model adopts the following technical scheme:
[0007] An ultra-high temperature and ultra-high pressure dual compensation dual laterolog probe, the improvement lies in: including a circuit steel cylinder, an intermediate joint, a mandrel 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 wire groove is opened in the mandrel. A high-pressure seal plug is arranged at one end of the wire groove adjacent to the intermediate joint, and a high-pressure male plug is arranged at one end adjacent to the lower steel cylinder. The through wire led out from the electronic circuit is led to the high-pressure male plug through the high-pressure seal plug. A string of electrodes and insulating rings are sleeved outside the mandrel, and the above-mentioned electrodes and insulating rings are tightened against the insulating sleeve on the outer wall of the intermediate joint by a positioning sleeve and a compression nut;
[0008] The described electrode and insulating ring 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 together in sequence. The contact surfaces between them are sealed by sealing rings.
[0009] The described first upper A1 electrode ring, second upper A1 electrode ring, second insulating ring, and third insulating ring are step ring-shaped structures that are thicker at the front and thinner at the 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, and a grooved tube is arranged in the gap between the rear step rings. A spiral tube is arranged in the gap between the rear step rings of the second insulating ring and the third insulating ring.
[0010] The described 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 arranged on the outer side of the upper A1* insulating ring, and both sides of the protrusion are respectively connected to the upper A1* electrode ring and the first upper A1 electrode ring. The described 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 arranged on the outer side of the lower A1* insulating ring, and both sides of the protrusion are respectively connected to the second lower A1 electrode ring and the lower A1* electrode ring.
[0011] Furthermore, the intermediate joint and the mandrel are mechanically connected by a chuck.
[0012] Furthermore, one end of the circuit steel cylinder is connected to the intermediate joint as a whole through a threaded ring, and the other end is connected to the upper cap; one end of the lower steel cylinder is connected to the mandrel as a whole through a threaded ring, and the other end is connected to the lower plug.
[0013] Furthermore, high-temperature fiberglass is also wound on the outer wall of the mandrel.
[0014] Furthermore, an insulating sleeve is sleeved outside the positioning sleeve and the compression nut.
[0015] Furthermore, the inside of the probe is filled with silicone oil, and an oil injection assembly, an exhaust screw, a balance piston, a piston compression spring, a safety valve, and an overflow valve are arranged on the probe.
[0016] 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 respectively electrically connected to the electronic circuit through electrode leads.
[0017] 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 PEEK material insulating rings.
[0018] Further, alternating square grooves and stress relief holes are engraved on the grooved pipe; a helical groove is engraved on the helical pipe.
[0019] Further, 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.
[0020] The beneficial effects of the utility model are as follows:
[0021] The ultra-high temperature and ultra-high pressure dual-compensation dual laterolog probe disclosed by the utility model can stably work for a long time in an ultra-high temperature and ultra-high pressure environment of 230 °C and 206 MPa, and obtain qualified dual laterolog curves. It overcomes the problems of radial seal failure leakage and axial pre-tightening failure 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 virgin formation for ultra-deep well exploration. Description of the Drawings
[0022] Figure 1 is a schematic diagram of radial leakage and axial loosening of the existing dual laterolog probe;
[0023] Figure 2 is a schematic axial sectional view of the probe disclosed by the utility model;
[0024] Figure 3 is a schematic diagram of the installation positions of the grooved pipe and the helical pipe in the probe disclosed by the utility model;
[0025] Figure 4 is a schematic diagram of the structure of the grooved pipe in the probe disclosed by the utility model;
[0026] Figure 5 is a schematic diagram of the structure of the helical pipe in the probe disclosed by the utility model;
[0027] Figure 6 is a schematic diagram of the installation position of the upper A1* insulating ring assembly in the probe disclosed by the utility model;
[0028] Figure 7 is a schematic diagram of the structure of the upper A1* insulating ring assembly in the probe disclosed by the utility model;
[0029] Figure 8 is a schematic diagram of the structure of the lower A1* insulating ring assembly in the probe disclosed by the utility model;
[0030] Figure 9 is the effect diagram after double compensation of the grooved pipe and the helical pipe in the probe disclosed by the utility model.
[0031] Reference Signs:
[0032] 1 - Electronic circuit; 2 - Upper A1* Insulating Ring Assembly; 3 - Lower A1* Insulating Ring Assembly; 4 - Safety Valve; 5 - Relief 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 - Helical Tube; 17 - Locating Sleeve; 18 - Compression Nut; 19 - Circuit Steel Cylinder; 20 - Lower Steel Cylinder; 21 - Mandrel; 22 - Intermediate Joint; 23 - Oil Injection Assembly; 24 - Exhaust Screw; 25 - Balance Piston; 26 - Piston Compression Spring; 27 - Upper Cap; 28 - Lower Plug; 29 - Insulating Sleeve; 30 - Sealing Ring and Retaining Ring; 31 - High Temperature Fiberglass Reinforced Plastic; 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 Embodiment
[0033] In order to make the objectives, technical solutions and advantages of the present utility model clearer and more understandable, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.
[0034] In this embodiment, taking Figure 2 as an example, the axial direction refers to the length direction, the radial direction refers to the width direction, the front refers to the left side, and the rear and the end refer to the right side.
[0035] Embodiment 1. This embodiment discloses an ultra-high temperature and ultra-high pressure double-compensation double lateral logging probe. As Figure 2 shown, it includes a circuit steel cylinder 19, an intermediate joint 22, a mandrel 21 and a lower steel cylinder 20 connected together. The intermediate joint and the mandrel are mechanically connected by a chuck. One end of the circuit steel cylinder is connected to the intermediate joint as a whole through a threaded ring, and the other end is connected to the upper cap 27; one end of the lower steel cylinder is connected to the mandrel as a whole through a threaded ring, and the other end is connected to the lower plug 28. The inside of the probe is filled with silicone oil, and an oil injection assembly 23, an exhaust screw 24, and a balance piston 25, a piston compression spring 26, a safety valve 4, and a relief valve 5 for pressure balance are provided on the probe.
[0036] An electronic circuit 1 is arranged inside the circuit steel cylinder. An insulating sleeve 29 is sleeved on the outer wall of the intermediate joint. An axial wire groove is opened inside the mandrel. A high pressure sealing plug 32 is arranged at one end of the wire groove adjacent to the intermediate joint, and a high pressure male connector 33 is arranged at the end adjacent to the lower steel cylinder. The through wire led out from the electronic circuit is led to the high pressure male connector through the high pressure sealing plug.
[0037] A high-temperature fiberglass 31 with a certain thickness is wound around the outer wall of the mandrel. A series of electrodes and insulating rings are sleeved outside the mandrel. At the ends of the electrodes and insulating rings, a positioning sleeve 17 and a compression nut 18 are used to tightly press the above-mentioned electrodes and insulating rings against the insulating sleeve on the outer wall of the intermediate joint, that is, the electrodes and insulating rings are pre-tightened by the positioning sleeve and the compression nut, and an insulating sleeve 29 is sleeved outside the positioning sleeve and the compression nut.
[0038] 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 together in sequence. The contact surfaces between them are sealed by a sealing ring and a retaining ring 30;
[0039] 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 an electrode lead.
[0040] 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 PEEK material insulating rings.
[0041] As Figure 3 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-shaped structures that are thick in the front and thin in the 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 back step rings. As Figure 4 shown, square grooves and stress relief holes are engraved on the grooved tube; a spiral tube 16 is arranged in the gap between the back step rings of the second insulating ring and the third insulating ring. As Figure 5 shown, a spiral groove is engraved on the spiral tube; a double compensation device composed of the grooved tube and the spiral tube compensates for the different deformation amounts of the insulating ring and the electrode ring caused by thermal expansion and contraction through combined deformation. It can ensure that the axial pre-tightening 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 pre-tightening failure.
[0042] As Figure 6, as shown in Figure 7, the upper A1* insulation ring assembly includes an upper A1* insulation ring 34 and a large support ring 36. The large support ring is embedded in the inner hole of the upper A1* insulation ring. A protrusion is provided on the outer side of the upper A1* insulation ring, and both sides of the protrusion are respectively connected to the upper A1* electrode ring and the first upper A1 electrode ring. The sealing form adopts piston rod sealing, and the sealing rings are respectively located in the inner sealing grooves of the upper A1* electrode ring and the first upper A1 electrode ring. As Figure 8 shown, the lower A1* insulation ring assembly includes a lower A1* insulation ring 35 and a small support ring 37. The small support ring is embedded in the inner hole of the lower A1* insulation ring. A protrusion is provided on the outer side of the lower A1* insulation ring, and both 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* insulation ring and the lower A1* insulation ring due to temperature changes, ensure the effectiveness of radial sealing, and prevent radial leakage of the probe.
[0043] 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* insulation ring, which is equivalent to adding a metal support ring to the inner hole of the upper A1* insulation ring, and the outer circular part of the upper A1* insulation ring is the sealing surface. During oil well logging, when the probe reaches the target layer and works in a high-temperature and high-pressure environment, the upper A1* insulation ring expands and deforms radially outward. Since the upper A1* electrode ring restricts the outward expansion and deformation of the upper A1* insulation ring, there is no radial expansion space for the upper A1* insulation ring, and it can only be extruded axially where there is expansion space. At this time, the radial sealing is reliable, and the probe reaches a stable state and continues to work. During the process of reaching room temperature after logging, the radial direction of the upper A1* insulation ring will contract inward. At this time, the large support ring restricts the inward contraction of the upper A1* insulation ring, ensuring the sealing fit gap between the upper A1* insulation ring and the upper A1* electrode ring, and preventing radial leakage of the probe.
[0044] The material of the small support ring is stainless steel. There is an interference fit between the small support ring and the inner hole of the lower A1* insulation ring, which is equivalent to adding a metal support ring to the inner hole of the lower A1* insulation ring as well. The principle of radial leakage prevention of the lower A1* insulation ring assembly is the same as that of the upper A1* insulation ring assembly, and will not be elaborated here.
[0045] 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 small elastic deformation (axial displacement), and the spiral tube can produce a large elastic deformation (axial displacement). When the positioning sleeve and the compression nut are installed in place, by using the combined deformation of the grooved tube and the spiral tube, a compensation gap can be formed between the first upper A1 electrode ring and the second upper A1 electrode ring. At this time, the spiral tube has produced a relatively large elastic deformation (axial displacement) and stored a large amount of energy.
[0046] When 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 that of the metal ring. 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 logging is pulled up, 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 spring back 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 logging is completed and the ambient temperature reaches room temperature or even lower, the insulating ring made of PEEK material will continue to shrink. The compensation amount of the grooved tube can no longer meet the pre-tightening requirement. At this time, the spiral tube will slowly spring back, thereby generating a reverse compensation gap 39 as shown in Figure 9 Figure 39. Since the spiral tube has produced a large elastic deformation (axial displacement) and stored a large amount of energy before, a relatively large elastic force can always be generated during the emergence of the reverse compensation gap 39 to ensure that all metal rings and insulating rings are always in a pre-tightened state without loosening.
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.