Novel ultrahigh-temperature hard electrode nipple

Abstract

The utility model discloses a novel ultra-high temperature hard electrode pup joint which comprises an instrument main body, two centralizing rings, a sealing ring, a compensating ring, a plurality of sections of first insulating rings and a section of second insulating ring are sleeved on the outer wall of the instrument main body, two centralizing rings are respectively arranged at two ends of the instrument main body, one centralizing ring is adjacent to the sealing ring, and the other centralizing ring is adjacent to the compensating ring. One centralizing ring is adjacent to the first insulating ring, the other centralizing ring is adjacent to the compensation ring, the compensation ring is adjacent to the second insulating ring, a plurality of sections of first insulating rings are arranged between the second insulating ring and the sealing ring, the adjacent first insulating rings and the first insulating ring and the second insulating ring are overlapped and matched, and sealing rings are arranged at the overlapped positions. According to the novel ultra-high-temperature hard electrode short section, the sealing ring, the first insulating ring and the second insulating ring are of an assembly type structure to form the insulating part, the glass fiber reinforced plastic winding technology is replaced, the insulating reliability is high, the insulating part can be detached, maintained and replaced, and on-site operation is convenient.

Description

Technical Field

[0001] The utility model belongs to the field of oil logging, and particularly relates to a new type of ultra-high temperature hard electrode sub-section in this field. Background Technique

[0002] With the improvement of exploration and drilling technical capabilities, the drilling depth is getting deeper and deeper, and the number of ten-thousand-meter wells has also been increasing in recent years. According to the relationship between well temperature, well depth, and geothermal gradient, the deeper the well, the higher the well temperature. The deep and shallow lateral curves are conventional curves of resistivity logging and play an important role in formation evaluation. Among them, for the requirement of the detection depth of the deep lateral, the curve measurement needs to be completed by means of the shielding length of the hard electrode electric field. The insulation performance and high-temperature resistance performance of the insulating material of the hard electrode have an important impact on the quality of the deep lateral curve. In the existing technology, most of the hard electrode sub-sections adopt the fiberglass winding process. Under high-temperature conditions, the cured resin of the fiberglass material softens, the strength decreases, and the wear resistance becomes poor. When encountering an acidic or alkaline mud environment, the fiberglass is prone to delamination and disintegration, the insulation reliability decreases, and it affects the deep lateral curve measurement; moreover, the fiberglass insulating material adopts the winding process and is integrally processed, and it cannot be replaced on site. Content of the Utility Model

[0003] The technical problem to be solved by the utility model is to provide a new type of ultra-high temperature hard electrode sub-section, which is applied to the deep lateral curve measurement under the ultra-high temperature environment condition of 230°C. The upper and lower ends of the hard electrode have an insulating effect, and the outer surface is covered with a high-temperature resistant non-metallic insulating material to shield the electric field, meeting the distance requirements of the electrodes in the deep lateral measurement loop, and having the characteristics of high temperature resistance, high-temperature compensation of the insulating material, high insulation reliability, and the insulating material can be repaired and replaced.

[0004] The utility model adopts the following technical scheme:

[0005] A new type of ultra-high temperature hard electrode sub-section, the improvement lies in: including an instrument main body, two centralizer rings, a sealing ring, a compensation ring, several first insulating rings and one second insulating ring are sleeved on the outer wall of the instrument main body. Among them, the two centralizer rings are respectively located at both ends of the instrument main body, one centralizer ring is adjacent to the sealing ring, the other centralizer ring is adjacent to the compensation ring, the compensation ring is adjacent to the second insulating ring, and several first insulating rings are between the second insulating ring and the sealing ring. The adjacent first insulating rings and between the first insulating ring and the second insulating ring overlap and cooperate, and a sealing ring is installed at the overlapping part.

[0006] Further, an upper cap and a lower cap are respectively installed on the instrument interfaces at both ends of the instrument main body.

[0007] Further, the centralizer ring is fixed to the hook plate hole of the instrument main body with screws.

[0008] Further, the centralizer ring is made of martensitic stainless steel.

[0009] Further, two or more rows of cemented carbide blocks are circumferentially inlaid on the centralizing ring.

[0010] Further, each row has 6 cemented carbide blocks, and the 6 cemented carbide blocks in each row are evenly distributed along the circumferential direction.

[0011] Further, the sealing ring, the first insulating ring and the second insulating ring are all made of glass fiber reinforced PEEK material.

[0012] Further, the compensating ring is a metal grooved tube.

[0013] The beneficial effects of the utility model are as follows:

[0014] The novel ultra-high temperature hard electrode sub-joint disclosed by the utility model consists of a sealing ring, a first insulating ring and a second insulating ring which adopt an assembled structure to form an insulating part, replacing the winding glass fiber reinforced plastic process. The insulating reliability is high, and the insulating part can be disassembled, repaired and replaced, which is convenient for on-site operation. Between adjacent first insulating rings and between the first insulating ring and the second insulating ring, they overlap and cooperate, and a sealing ring is installed at the overlapping part to prevent mud from entering the overlapping part, ensuring the insulation integrity between multiple insulating rings and meeting the requirements of electric field insulation shielding. The sealing ring, the first insulating ring and the second insulating ring are all made of glass fiber reinforced PEEK material, which can work for a long time under the environmental condition of 260 °C, solving the problem of high temperature resistance of the insulating material. An elastic compensating ring is set to compensate for the length change of the insulating material under high temperature conditions, solving the problem of high temperature expansion compensation of the insulating material. Centralizing rings are installed at both ends of the instrument body to avoid collision and friction between the insulating part and the wellbore wall, improving the wear resistance of the instrument body. Description of the Drawings

[0015] Figure 1 is a schematic diagram of the composition of the novel ultra-high temperature hard electrode sub-joint disclosed by the utility model;

[0016] Figure 2 is a schematic diagram of the composition of the insulating part in the novel ultra-high temperature hard electrode sub-joint disclosed by the utility model;

[0017] Figure 3 is a schematic diagram of the structure of the centralizing ring in the novel ultra-high temperature hard electrode sub-joint disclosed by the utility model;

[0018] Figure 4 is an axial sectional view of the centralizing ring in the novel ultra-high temperature hard electrode sub-joint disclosed by the utility model.

[0019] Reference Signs:

[0020] 1 - upper cap, 2 - centralizing ring, 21 - cemented carbide block, 3 - sealing ring, 4 - first insulating ring, 5 - second insulating ring, 6 - compensating ring, 7 - instrument body, 8 - upper cap, 9 - sealing ring. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0022] Example 1: This example discloses a new type of ultra-high temperature hard electrode short section, which has high insulation reliability under high temperature conditions and meets the requirements of long-term use (at least 30 hours) at 230°C and short-term use (at least 6 hours) at 260°C. Figure 1 As shown, it includes an instrument body 7, on the outer wall of which are sleeved two straightening rings 2, a sealing ring 3, a compensating ring 6, a plurality of first insulating rings 4 and a second insulating ring 5, wherein the two straightening rings are respectively located at both ends of the instrument body, one straightening ring is adjacent to the sealing ring, the other straightening ring is adjacent to the compensating ring, and the compensating ring is adjacent to the second insulating ring, as shown in FIG. Figure 2 As shown, there are several sections of first insulating rings between the second insulating ring and the sealing ring. Adjacent first insulating rings and first insulating rings and second insulating rings overlap and fit, and sealing rings 9 are installed at the overlapping parts. This multi-section combination makes it easy to replace the insulating rings. The length of the multi-section first insulating ring and the second insulating ring is relatively long after being combined. The expansion coefficient of the non-metallic material is much greater than that of the metal instrument body. The length will change greatly at high temperature. To compensate for this length change, a compensation ring is installed between the second insulating ring and the straightening ring. The compensation ring adopts an elastic metal grooved tube. When the force is applied, the groove will produce elastic deformation to avoid permanent deformation of the insulating ring due to high temperature expansion.

[0023] In this embodiment, an upper cover cap 1 and a lower cover cap 8 are respectively installed on the instrument interfaces at both ends of the instrument body, which can not only protect the instrument interfaces but also be used when hoisting the instrument and carrying it daily.

[0024] The insulating part composed of the sealing ring, the first insulating ring and the second insulating ring is made of glass fiber reinforced PEEK GF30 material to achieve electric field insulation shielding, and the sealing ring is sealed inside to isolate the metal at the upper and lower ends. PEEK material is dense, has low water absorption, isotropic, has good acid and alkali resistance, can work stably under 260℃ environment conditions, and can meet the use requirements under ultra-high temperature conditions.

[0025] Fix the centralizer ring at the hook plate hole of the instrument body with screws. The centralizer ring is replaceable. The centralizer ring isolates the insulating part from the wellbore by a certain distance to prevent the insulating part from colliding and wearing against the wellbore during logging, reducing the risk of damage to the insulating part and improving the reliability of on-site application. To improve the wear resistance of the centralizer ring, the centralizer ring is made of martensitic stainless steel 05Cr17Ni4Cu4Nb. Through solution + aging treatment, the hardness of the material is controlled between HRC35-38. Under this hardness condition, the material has both a certain strength and hardness and a certain toughness, which is beneficial to improving the wear resistance. As Figure 3 , as shown in Figure 4, two rows of cemented carbide blocks 21 are inlaid circumferentially on the centralizer ring. Each row has 6 cemented carbide blocks, and the 6 cemented carbide blocks in each row are evenly distributed along the circumferential direction. When the centralizer ring contacts and rubs against the wellbore, the cemented carbide blocks greatly improve the wear resistance of the centralizer ring, reducing its replacement frequency and application cost.

Claims

1. A new type of ultra-high temperature hard electrode short section, characterized by: The invention comprises an instrument body, on the outer wall of which are sleeved two straightening rings, a sealing ring, a compensating ring, several sections of first insulating rings and one section of second insulating ring, wherein the two straightening rings are respectively located at the two ends of the instrument body, one straightening ring is adjacent to the sealing ring, the other straightening ring is adjacent to the compensating ring, the compensating ring is adjacent to the second insulating ring, several sections of first insulating rings are arranged between the second insulating ring and the sealing ring, adjacent first insulating rings and first insulating rings and second insulating rings are overlapped and matched, and sealing rings are installed at the overlapping parts.

2. According to claim 1, the novel ultra-high temperature hard electrode nipple is characterized by: An upper cover cap and a lower cover cap are respectively installed on the instrument interfaces at both ends of the instrument body.

3. According to claim 1, the novel ultra-high temperature hard electrode nipple is characterized by: Fix the straightening ring to the hook hole of the instrument body with screws.

4. According to claim 1, the novel ultra-high temperature hard electrode nipple is characterized by: The righting ring is made of martensitic stainless steel.

5. According to claim 1, the novel ultra-high temperature hard electrode nipple is characterized by: More than two rows of hard alloy blocks are embedded in the circumferential direction on the straightening ring.

6. According to claim 5, the novel ultra-high temperature hard electrode nipple is characterized in that: There are 6 cemented carbide blocks in each row, and the 6 cemented carbide blocks in each row are evenly distributed along the circumferential direction.

7. According to claim 1, the novel ultra-high temperature hard electrode nipple is characterized by: The sealing ring, the first insulating ring and the second insulating ring are all made of glass fiber reinforced PEEK material.

8. According to claim 1, the novel ultra-high temperature hard electrode nipple is characterized by: The compensation ring is a metal grooved tube.

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