Dual lateral probe

Abstract

The utility model provides a bi-lateral probe, the bi-lateral probe comprises an upper end assembly, a core shaft assembly and a lower end assembly which are connected in sequence, the core shaft assembly is sleeved with an electrode ring, insulating rings and an insulating sleeve, the electrode ring is clamped between two adjacent insulating rings, and the insulating sleeve is sleeved with an insulating sleeve. The electrode ring and the insulating ring are positioned between the two insulating sleeves; wherein the electrode ring is provided with an oil injection hole and an oil passing hole which are communicated with each other, the oil injection hole is used for installing an oil injection screw in a matched mode, and the oil passing hole is communicated with an oil injection space between the electrode ring and the mandrel assembly. The utility model has the beneficial effects that the oil injection hole is arranged on the electrode ring for installing the oil injection screw, so that the instrument can be conveniently supplemented with oil and maintained.

Description

TECHNICAL FIELD

[0001] The utility model relates to oil logging equipment technical field, in particular to a kind of double lateral probe. BACKGROUND

[0002] Double lateral probe belongs to one kind of oilfield open hole well formation resistivity measuring instrument, it is one of main equipment in resistivity logging method, it can measure the resistivity of two different detection depths of formation invaded zone resistivity and original formation resistivity simultaneously, so that according to its measurement data, researchers can analyze the resistivity change between formation.

[0003] The double lateral probe in prior art is as shown in Figure 9 And Figure 10 Its main body is composed of a group of electrode ring 44 and insulating ring 45, electrode ring 44 and insulating ring 45 are all sleeved on mandrel with base body winding glass steel 47, and a certain length of glass steel shielding sleeve 46 needs to be installed at both ends to realize the shielding of double lateral instrument electrode current, due to the limitation of instrument radial dimension, oil injection screw 17 of double lateral probe can only be installed on the lower joint of glass steel shielding sleeve 46 and cannot be opened and leaked out of surface due to electrical performance limitation. With the higher and higher temperature and pressure index of logging instrument, after using in superhigh temperature and superhigh pressure well, a series of problems of existing traditional double lateral probe are exposed:

[0004] (1) glass steel shielding sleeve cannot resist superhigh temperature and is corroded by downhole acid and alkali,

[0005] (2) base body winding glass steel is easy to absorb moisture and affect insulation, and cannot be replaced, only can be taken off and rewound on lathe, which is complicated in operation, long in maintenance period and high in maintenance cost,

[0006] (3) when maintaining instrument and supplementing oil, oil injection screw needs to be disassembled by taking down or pulling apart glass steel shielding sleeve to leak out oil injection position, but glass steel shielding sleeve is bonded with instrument main body below after long time use, so that it cannot be taken down, old glass steel shielding sleeve needs to be cut off every time when supplementing oil, which is complicated in operation and increases maintenance cost.

[0007] Therefore, it is necessary to study a double lateral probe to solve the above problems or alleviate the influence caused by the above problems. UTILITY MODEL CONTENT

[0008] The utility model provides a kind of double lateral probe, by electrode ring is equipped with oil injection hole and installs oil injection screw, it is convenient for instrument to supplement oil and maintain, to effectively solve the above problems or alleviate the influence caused by the above problems.

[0009] The utility model discloses a double lateral probe can include the upper end subassembly, mandril subassembly and lower end subassembly that connect in proper order, the mandril subassembly is sleeved with electrode ring, insulating ring and insulating sleeve, the electrode ring is clamped between two adjacent insulating ring, and the electrode ring and the insulating ring are all located between two insulating sleeve.

[0010] Among them, the electrode ring is provided with an oil injection hole and an oil passing hole in communication, the oil injection hole is used for matching the installation of an oil injection screw, and the oil passing hole communicates the oil injection space between the electrode ring and the mandril subassembly.

[0011] In one embodiment, the oil passing hole has a mounting hole at a distal end away from the oil injection hole, and a one-way valve is fitted in the mounting hole.

[0012] In one embodiment, the mandril subassembly includes a mandril, an insulating support tube, a first insulating sleeve, and a second insulating sleeve, which are all disposed between the electrode ring and the mandril and insulate them from each other.

[0013] In one embodiment, the insulating support tube is provided with an electrode slot and a first wire slot connected in its axial direction, the electrode slot is used for installing the electrode ring, and the first wire slot is used for installing an electrode lead connected to the electrode ring.

[0014] In one embodiment, the insulating support tube is further provided with a second wire slot designed in its axial direction, which is located between two adjacent electrode slots in the circumferential direction of the insulating support tube.

[0015] In one embodiment, the first and second insulating sleeves each include two half tiles, which are disposed outside the mandril and fixed by screws.

[0016] In one embodiment, the two half tiles are spaced apart on the mandril to form a slit for installing a wire.

[0017] In one embodiment, the insulating ring, the insulating sleeve, the insulating support tube, the first insulating sleeve, and the second insulating sleeve are all made of polyether ether ketone material.

[0018] In one embodiment, a balance piston assembly is provided between the electrode ring and the mandril subassembly, which is used to balance the liquid oil pressure in the oil injection space.

[0019] In one embodiment, a length compensator is provided near the lower end subassembly of the mandril subassembly, which is used to compensate for the length change caused by thermal expansion and contraction.

[0020] The double lateral probe provided by the utility model has at least the following beneficial effects compared with the prior art:

[0021] The double lateral probe of the utility model discloses has oil injection hole and oil passing hole on the electrode ring, installs oil injection screw through the oil injection hole, and the oil passing hole is connected with the oil injection space, so that the oil injection screw is leaked on the outer surface of the instrument, the old glass steel shielding sleeve needs to be cut off when oil is supplemented, and the new glass steel shielding sleeve needs to be installed after the oil is supplemented, so that the installation and dismounting operation is simpler, and the instrument is convenient for oil supplement and maintenance. BRIEF DESCRIPTION OF DRAWINGS

[0022] The utility model will be described in more detail based on the embodiments and with reference to the drawings.

[0023] Figure 1 It is a structure schematic view of the double lateral probe of the utility model embodiment;

[0024] Figure 2 It is a structure schematic view of the mandrel assembly of the utility model embodiment;

[0025] Figure 3 It is a structure schematic view of the insulating support tube of the utility model embodiment;

[0026] Figure 4 It is a structure schematic view of the first insulating sleeve of the utility model embodiment;

[0027] Figure 5 It is a structure schematic view of the first insulating sleeve of the utility model embodiment;

[0028] Figure 6 It is a structure schematic view of the second insulating sleeve of the utility model embodiment;

[0029] Figure 7 It is a structure schematic view of the second insulating sleeve of the utility model embodiment;

[0030] Figure 8 It is a structure schematic view of the balance piston assembly and the electrode ring connection of the utility model embodiment;

[0031] Figure 9 It is a partial structure schematic view of the double lateral probe in the prior art;

[0032] Figure 10 It is Figure 9 The sectional view of A-A in

[0033] In the drawings, the same components use the same reference signs.The drawings are not drawn according to the actual scale.

[0034] Reference signs:

[0035] 1-electronic circuit, 2-upper A1* insulating ring assembly, 3-lower A1* insulating ring assembly, 4-core shaft assembly, 5-first insulating ring, 6-second insulating ring, 7-insulating sleeve, 8-insulating support tube, 9-upper A1* electrode ring, 10-upper A1 electrode ring, 11-lower A1 electrode ring, 12-balancing piston assembly, 13-lower A1* electrode ring, 14-length compensator, 15-first insulating collet, 16-second insulating collet, 17-oil injection screw, 18-one-way valve, 19-oil discharge screw, 20-overflow valve, 21-gas discharge screw, 22-upper joint, 23-lower joint, 24-high pressure sealing plug, 25-high pressure connector male head, 26-threaded ring, 27-wear-resistant sleeve, 28-upper cap, 29-lower plug, 30-sealing ring and retaining ring, 31-intermediate joint, 32-core shaft, 33-clamping block, 34-electrode, 35-screw, 36-electrode slot, 37-second wire routing slot, 38-first wire routing slot, 39-piston electrode ring, 40-oil injection hole, 41-mounting hole, 42-oil passage hole, 43-slit, 44-electrode ring, 45-insulating ring, 46-glass steel shielding sleeve, 47-base body wrapped glass steel. DETAILED DESCRIPTION

[0036] The utility model will be further described in connection with the drawings.

[0037] As Figures 1 to 10 shown, the utility model discloses a double lateral probe can include the upper end subassembly, core shaft subassembly 4 and lower end subassembly that connect in proper order, the electrode ring 44, insulating ring 45 and insulating sleeve 7 are sheathed on core shaft subassembly 4, the electrode ring 44 is clamped between two adjacent insulating rings 45, and the electrode ring 44 and insulating ring 45 are located between two insulating sleeves 7;

[0038] Among them, the electrode ring 44 is provided with the oil injection hole 40 and the oil passage hole 42 that are communicated, the oil injection hole 40 is used for matching the installation oil injection screw 17, and the oil passage hole 42 communicates the oil injection space between the electrode ring 44 and the core shaft subassembly 4.

[0039] Specifically, the mandrel assembly 4 is located between the upper end assembly and the lower end assembly, and an electrode ring 44 for detection is sleeved on the mandrel assembly 4. In order to improve the accuracy of detection, two insulating rings 45 are arranged at the axial ends of the electrode ring 44, and the end of the insulating ring 45 away from the electrode ring 44 is provided with an insulating sleeve 7 of a certain length. And the upper end assembly, the lower end assembly, the electrode ring 44, the insulating ring 45, the insulating sleeve 7 and the mandrel assembly 4 cooperate to form an oil injection space. The electrode ring 44 is provided with an oil injection hole 40 and an oil passing hole 42, the oil injection screw 17 is installed through the oil injection hole 40, and the oil passing hole 42 is connected with the oil injection space, so that the oil injection screw 17 is leaked to the outer surface of the instrument, and the installation and disassembly operation is more simple, which is convenient for instrument oil supplement and maintenance, avoids the need to cut off the old glass steel shielding sleeve 46 when supplementing oil and the need to install a new glass steel shielding sleeve 46 after oil supplementing, and unnecessary maintenance cost increase is caused.

[0040] Further, as shown in Figure 1 The upper end assembly includes an upper joint 22 and an upper cap 28, and the lower end assembly includes a lower joint 23 and a lower plug 29. The outer sides of the upper joint 22 and the lower joint 23 are fixedly provided with wear-resistant sleeves 27 to reduce collision and friction damage of the instrument during lowering into the well. The dual lateral probe includes a plurality of electrode rings 44 and a plurality of insulating rings 45, each electrode ring 44 being clamped between two adjacent insulating rings 45, that is, the plurality of electrode rings 44 and the plurality of insulating rings 45 are arranged in cooperation with each other.

[0041] More specifically, the plurality of electrode rings 44 can include an upper A1 electrode ring 10, a lower A1 electrode ring 11, an upper A1* electrode ring 9 and a lower A1* electrode ring 13, and the plurality of insulating rings 45 can include an upper A1* insulating ring assembly 2, a lower A1* insulating ring assembly 3, a first insulating ring 5 and a second insulating ring 6.

[0042] Further, the oil injection hole 40 is a blind hole along the radial direction of the electrode ring 44, and the oil passing hole 42 is located on one side of the oil injection hole 40 and is a through hole along the axial direction of the electrode ring 44.

[0043] In one example, as shown in Figure 6 The end of the oil passing hole 42 away from the oil injection hole 40 has a mounting hole 41, and a one-way valve 18 is matched and installed in the mounting hole 41. In this way, through the design of the one-way valve 18, only the injection of silicone oil from the oil passing hole 42 is allowed, and the backflow of silicone oil from the oil passing hole 42 is avoided, thereby enhancing the safety and reliability of the instrument.

[0044] Need to be explained, as Figure 1As shown, the double lateral probe is also provided with a matching oil discharge screw 19, air discharge screw 21 and overflow valve 20. The oil discharge screw 19 can discharge the internal silicone oil when the instrument needs to be maintained and serviced. The air discharge screw 21 can discharge the internal gas when the instrument needs to be maintained and serviced. The overflow valve 20 can discharge part of the silicone oil when the temperature is too high or the internal and external pressure difference is too large, so as to release the internal pressure and avoid damage to the instrument.

[0045] In one example, as shown in Figure 1 and Figure 2 The mandrel assembly 4 includes a mandrel 32, an insulating support tube 8, a first insulating sleeve 15 and a second insulating sleeve 16 sleeved on the mandrel 32. The insulating support tube 8, the first insulating sleeve 15 and the second insulating sleeve 16 are between the electrode ring 44 and the mandrel 32 and insulate them from each other. The insulating support tube 8, the first insulating sleeve 15 and the second insulating sleeve 16 cooperate to replace the traditional base winding glass steel 47 in the double lateral probe for insulating the electrode ring 44 from the mandrel 32, and have the advantages of convenient installation and removal, high reliability, etc.

[0046] It should be noted that the mounting hole 41 is located on the inner end surface of the electrode ring 44. In order to increase the radial installation size, the inner diameter of the electrode ring 44 at this position is appropriately reduced. The corresponding outer diameter of the mandrel 32 at this position is also reduced accordingly. After the first insulating sleeve 15 and the second insulating sleeve 16 are sleeved on the mandrel 32, the outer diameter of the mandrel 32 is equivalent to the inner diameter of the electrode ring 44, so as to ensure that the electrode ring 44 can be installed in place through the two insulating sleeves and has high insulation between the mandrel 32. In order to minimize the occupation of the radial size, the oil passage hole 42 is designed to be eccentric downward relative to the mounting hole 41, so as to ensure that there is enough radial size to install the oil injection screw 17.

[0047] In one example, as shown in Figure 3 The insulating support tube 8 is provided with an electrode slot 36 and a first wire slot 38 connected in the axial direction. The electrode slot 36 is used to install the electrode ring 44, and the first wire slot 38 is used to install the electrode lead connected with the electrode ring 44.

[0048] Specifically, the outer surface of the insulating support tube 8 is provided with an inner recessed electrode slot 36 and a first wire slot 38. The electrodes 34 on the electrode ring 44 can be matched and sleeved on the outer surface of the insulating support tube 8 through the electrode slot 36. The electronic circuit 1 is arranged on the mandrel assembly 4. The electronic circuit 1 can match and install the electrode lead connected with the corresponding electrode ring 44 in the first wire slot 38, so as to facilitate the wire arrangement. The high-voltage plug male head 25 is built in the lower end assembly. A plurality of electrode rings 44 are independent of each other and insulated from each other. The electrode lead is introduced into the electronic circuit 1, and the electronic circuit 1 is introduced to the high-voltage plug male head 25 through the lead wire penetrating the high-voltage sealing plug 24.

[0049] In one example, as shown in Figure 3 The insulating support tube 8 is also provided with a second wire slot 37 designed along the axial direction thereof, which is located between two adjacent electrode slots 36 in the circumferential direction of the insulating support tube 8. The second wire slot 37 can be used to install electrode leads connected to other electrode rings 44 or to install leads connected to the high-voltage plug male head 25.

[0050] In one example, as shown in Figures 4 to 7 The first and second insulating sleeves 15 and 16 each include two half-wafers, which are arranged outside the mandrel 32 and fixed by screws 35. The insulating support tube 8 is sleeved on the mandrel 32 and can also be fixed by screws 35.

[0051] Further, the two half-wafers are spaced apart on the mandrel 32 to form a cutout 43 for installing leads. The cutout 43 serves as a wire slot, and compared to the traditional base body wound glass steel 47, which is not detachable, has a complicated processing process, and poor reliability, the mandrel assembly 4 has the advantages of easy installation and disassembly, high reliability, etc.

[0052] In one example, the insulating ring 45, the insulating sleeve 7, the insulating support tube 8, the first insulating sleeve 15, and the second insulating sleeve 16 can each be made of polyether ether ketone (PEEK) material.

[0053] Specifically, the insulating sleeve 7 made of high-strength polyether ether ketone material replaces the traditional glass steel shielding sleeve 46, which can ensure that the instrument can work reliably and not be corroded in the downhole environment of ultra-high temperature, ultra-high pressure, and acid and alkali corrosion. The insulating support tube 8, the first insulating sleeve 15, and the second insulating sleeve 16 made of high-strength polyether ether ketone material replace the traditional base body wound glass steel 47, which will not affect the insulation performance due to moisture absorption.

[0054] It should be noted that the two half-wafers of the first and second insulating sleeves 15 and 16 can each be made of a pipe cut in half from high-strength polyether ether ketone (PEEK) material and used in pairs.

[0055] In one example, as shown in Figure 1 and Figure 8 The electrode ring 44 and the mandrel assembly 4 are provided with a balance piston assembly 12, which is used to balance the liquid oil pressure in the oil injection space.

[0056] It should be noted that the balance piston assembly 12 is a prior art means, such as the pressure balance structure disclosed in the Chinese invention patent CN108150150B, which relates to a logging instrument. The balance piston assembly 12 can be designed as a piston electrode ring 39 in cooperation with the electrode ring 44, and the oil injection hole 40 can be provided on the piston electrode ring 39.

[0057] In one example, the length compensator 14 is arranged at a position of the mandrel assembly 4 close to the lower end assembly, and is used to compensate the length change caused by thermal expansion and contraction.

[0058] Specifically, the electrode ring 44 and the insulating ring 45 are matched and arranged outside the mandrel assembly 4, and the ends thereof are pre-tightened by the pressing device, and the thermal expansion and contraction between different materials are compensated by the length compensator 14.

[0059] In one example, the two ends of the mandrel assembly 4 are connected to the upper joint 22 and the lower joint 23 respectively by the clamping block 33 and the threaded ring 26, and the end of the mandrel assembly 4 close to the upper end assembly has the intermediate joint 31, and the mandrel 32 is connected to the intermediate joint 31 through the clamping block 33 and is fixed by the screw 35.

[0060] In one example, the upper end assembly, the mandrel assembly 4 and the lower end assembly are provided with corresponding sealing rings and the retaining ring 30 at the sealing connection of each structure as required.

[0061] In summary, the beneficial effects of the double lateral probe of the utility model at least include:

[0062] The double lateral probe of the utility model has the insulating sleeve, the insulating support pipe, the first insulating clamping sleeve and the second insulating clamping sleeve and other insulating structures made of high-strength polyether ether ketone (PEEK) material, has high reliability, can work stably for a long time under the super-high temperature and super-high pressure environment of 230 DEG C and 206 MPa, can be used for a long time without performance degradation, the first insulating clamping sleeve and the second insulating clamping sleeve are convenient to disassemble and replace, the oil injection screw is installed on the electrode ring, and the oil injection is convenient, the instrument is easy to maintain and maintain.

[0063] Although the utility model has been described with reference to the preferred embodiments, various improvements can be made and equivalent parts can be replaced without departing from the scope of the utility model. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The utility model is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A dual-lateral probe, comprising: The double lateral probe comprises a upper end assembly, a mandrel assembly and a lower end assembly connected in sequence, an electrode ring, an insulating ring and an insulating sleeve are sleeved on the mandrel assembly, the electrode ring is clamped between two adjacent insulating rings, and the electrode ring and the insulating ring are located between two insulating sleeves; The electrode ring is provided with an oil injection hole and an oil passing hole in communication, the oil injection hole is used for matching an oil injection screw, and the oil passing hole communicates an oil injection space between the electrode ring and the mandrel assembly.

2. The dual-lateral probe of claim 1, wherein, An installation hole is formed at an end of the oil passing hole away from the oil injection hole, and a one-way valve is matched and installed in the installation hole.

3. The dual-lateral probe of claim 1, wherein, The mandrel assembly comprises a mandrel, an insulating support tube, a first insulating sleeve and a second insulating sleeve sleeved on the mandrel, the insulating support tube, the first insulating sleeve and the second insulating sleeve are located between the electrode ring and the mandrel and insulate them from each other.

4. The dual-lateral probe of claim 3, wherein, An electrode slot and a first wire slot are formed on the insulating support tube in axial connection, the electrode slot is used for installing the electrode ring, and the first wire slot is used for installing an electrode lead wire connected with the electrode ring.

5. The dual-lateral probe of claim 4, wherein, A second wire slot is also formed on the insulating support tube in axial design, and the second wire slot is located between two adjacent electrode slots in the circumferential direction of the insulating support tube.

6. The dual-lateral probe of claim 3, wherein, The first insulating sleeve and the second insulating sleeve each comprise two half tiles, the half tiles are sleeved on the mandrel and fixed by screws.

7. The dual-lateral probe of claim 6, wherein, The two half tiles are spaced apart on the mandrel to form a cut, and the cut is used for installing a wire.

8. The dual-lateral probe of claim 3, wherein, The insulating ring, the insulating sleeve, the insulating support tube, the first insulating sleeve and the second insulating sleeve are each made of polyether ether ketone material.

9. The dual-lateral probe of any one of claims 1 to 8, wherein, A balance piston assembly is arranged between the electrode ring and the mandrel assembly, and the balance piston assembly is used for balancing the liquid oil pressure in the oil injection space.

10. The dual-lateral probe of any one of claims 1 to 8, wherein, A length compensator is arranged at a position of the mandrel assembly close to the lower end assembly, and the length compensator is used for compensating the length change caused by thermal expansion and contraction.

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