A quality control method for surfacing welding repair of drilling tool stabilizer straightening belt

Abstract

The present application belongs to the technical field of drilling tool stabilizer, and particularly relates to a quality control method for repairing a drilling tool stabilizer by using a righting belt and surfacing, which is used for removing the original alloy column, the surfacing layer metal and the heat affected zone of the base body of the drilling tool stabilizer, and performing crack inspection, judgment and corresponding treatment measures to eliminate the influence of the original crack defects on the surfacing repair quality of the drilling tool stabilizer; if the crack length and depth do not exceed the standard requirements, the surfacing can be performed after the crack is removed; the carbon equivalent is calculated according to the material of the drilling tool stabilizer before the surfacing, and the reasonable preheating temperature, welding process parameters and post-weld cooling or heat treatment mode are determined to ensure the repair quality from the process; the quality control method can effectively control the surfacing repair process of the drilling tool stabilizer, ensure the quality reliability, and prevent the fracture accidents of the drilling tool stabilizer caused by welding cracks after multiple repairs.

Description

Technical Field

[0001] The invention belongs to the technical field of drill tool stabilizers, and particularly relates to a quality control method for surfacing welding repair of a drill tool stabilizer centralizing belt. Background Art

[0002] Drill tool stabilizers are key tools in the process of oil, gas and geological exploration drilling operations. Drill tool stabilizers and other drilling tools such as drill pipes, drill collars and drilling jars are combined into drill strings. They play a role in stabilizing and straightening the drill string during drilling operations, increasing the rigidity of the drill string and preventing well deviation. There are many types of drill tool stabilizers, such as Figure 2 As shown, the structure consists of a drill tool stabilizer base 1 and a wear-resistant centering belt 2. During drilling operations, the hard wellbore rock easily wears away the stabilizer's wear-resistant layer, rendering it ineffective. Therefore, after a period of use, the drill tool stabilizer requires multiple welding repairs to the centering belt 2 before it can be used properly. Otherwise, it will be scrapped, resulting in significant waste.

[0003] There are three main methods to repair the drill tool stabilizer centralizing belt 2:

[0004] 1. Use high carbon low alloy wear-resistant welding rod (such as CHR207) to perform arc surfacing welding on the base of the drill stabilizer centralizing belt 2;

[0005] 2. Using oxygen-acetylene flame or plasma spray welding to weld hard alloy strips and surfacing nickel-copper alloy powder on the stabilizer centering belt 2 substrate;

[0006] 3. Use high-strength low-hydrogen welding rods or welding wires to first weld a certain thickness of metal on the base of the stabilizer straightening belt 2, and then drill holes in the welded layer metal to embed wear-resistant alloy columns 3.

[0007] In comparison, the third method of surfacing welding to repair the drill tool stabilizer is easier to control the process parameters, and the wear-resistant time after repair is longer.

[0008] However, drill tool stabilizers are typically made of 35CrMo, 40CrNiMo, 40CrMnMo, or 42CrMo steel, high-quality chromium-molybdenum alloy steels with high carbon content and alloying elements like Cr and Mo, resulting in a high carbon equivalent (CE). Consequently, drill tool stabilizers exhibit poor weldability. During the overlay welding repair process, improper process parameter control and a lack of necessary quality control procedures can lead to poor repair quality and reliability, and cracks can easily form in the drill tool stabilizer itself. During drilling operations, under complex conditions such as pressure, temperature, and alternating loads, drill tool stabilizers can easily break and fail due to cracks in the body, resulting in significant economic losses. Summary of the Invention

[0009] The purpose of the present invention is to provide a quality control method for surfacing welding repair of a drill tool stabilizer centralizing belt, which solves the problem that the existing surfacing welding repair technology of the drill tool stabilizer wear-resistant belt is prone to fracture and failure due to cracks on the body.

[0010] The present invention is achieved through the following technical solutions:

[0011] A quality control method for surfacing welding repair of a drill tool stabilizer centralizing belt comprises the following steps:

[0012] S1. Check whether the drill stabilizer is repairable;

[0013] After inspection, if the drill tool stabilizer cannot be repaired, it will be scrapped; if the drill tool stabilizer can be repaired, enter S2;

[0014] S2. Remove the original alloy column, original cladding metal and heat-affected zone of the drill tool stabilizer to be repaired;

[0015] S3. Check whether there are cracks on the base of the drill tool stabilizer straightening belt to be welded;

[0016] After inspection, if there is no crack on the base body of the drill tool stabilizer to be welded, directly proceed to S6; if there is a crack on the base body to be welded, proceed to S4;

[0017] S4. Determine whether the crack depth and length on the base body of the drill tool stabilizer centralizer to be welded exceeds the standard requirements;

[0018] If the crack length or depth exceeds the standard requirements, the system will be scrapped; if the crack length or depth does not exceed the standard requirements, the system will proceed to S5;

[0019] S5. Clear the cracks that do not exceed the standard on the base body of the drill tool stabilizer straightening belt to be welded;

[0020] S6. Determine the material of the drill tool stabilizer to be repaired and calculate its carbon equivalent;

[0021] S7. Determine the preheating temperature, welding process parameters and post-weld cooling or heat treatment process for cladding repair based on the material and carbon equivalent of the drill tool stabilizer;

[0022] S8. Based on the preheating temperature and welding process determined in S7, surfacing metal is performed on the base of the drill tool stabilizer centralizing belt;

[0023] S9. Perform post-weld treatment according to the post-weld cooling or heat treatment process determined in S7;

[0024] After the post-weld treatment is completed, subsequent processing and inspection are carried out to complete the surfacing repair.

[0025] Furthermore, in S1, the drill tool stabilizer repairability inspection refers to whether the drill tool stabilizer base has appearance defects and cracks that seriously affect the safety of use; the inspection method is visual inspection, magnetic particle inspection or ultrasonic inspection.

[0026] Furthermore, in S6, the carbon equivalent calculation formula is:

[0027] CE AWS =C+Mn / 6+Si / 24+Ni / 15+Cr / 5+Mo / 4+Cu / 13+P / 2.

[0028] Furthermore, S2 specifically includes: knocking off the main body of the straightening strip around the alloy column and taking out the original alloy column; turning the outer diameter of the original straightening strip surfacing metal flat and removing the original welding heat affected zone.

[0029] Furthermore, in S3, the method for inspecting whether the substrate to be welded has cracks is ultrasonic testing.

[0030] Furthermore, in S8, the welding rod used for surfacing welding on the base of the drill tool stabilizer centralizer belt is E5015 or E6015 low-hydrogen alkaline welding rod; the thickness of the surfacing layer metal is 20mm-40mm.

[0031] Furthermore, in S9, the post-weld cooling process is specifically as follows: wrap the centralizing belt and the substrate with a length of at least 250 mm at both ends with asbestos cloth, tie it tightly and cool it slowly for more than 24 hours until the temperature of the centralizing belt and substrate repaired by the drill tool stabilizer surfacing welding is lower than 100°C.

[0032] Furthermore, in S9, the subsequent inspection includes the following steps:

[0033] S10, check whether there are cracks in the surfacing layer and heat-affected zone of the drill tool stabilizer; if there are cracks, go to S4, repeat S4, S5, S8 and post-weld treatment; if there are no cracks, go to S11;

[0034] S11, processing the outer circle of the centralizing belt after surfacing welding, and trimming the edge of the centralizing belt to be smooth;

[0035] S12. Drilling a circular hole on the surfacing layer's centralizing belt according to the alloy column diameter;

[0036] S13, embedding a wear-resistant alloy column in the circular hole of the cladding layer;

[0037] S14, check whether the alloy column is firmly embedded; if there is a gap between the alloy column and the circular hole or the embedding is not firm, return to S13, remove the alloy column, and reinsert the alloy column; if the alloy column is firmly embedded in the circular hole of the surfacing layer, the process ends.

[0038] Furthermore, in S10, the crack inspection method of the cladding layer and the heat-affected zone of the substrate is: first use magnetic powder to detect whether there are welding cracks in the cladding layer and the heat-affected zone of the substrate; if cracks exist, then use ultrasonic detection method to determine whether the crack depth and length exceed the standard.

[0039] Furthermore, in S12, the diameter D and depth L of the drill hole on the surfacing layer are determined according to the outer diameter d0 and length l0 of the embedded alloy column, where D = d0 - 0.25 mm, L = l0 + 0.5 mm;

[0040] The circular holes drilled on the surfacing layer are arranged perpendicular to the edge of the centralizing belt.

[0041] Compared with the prior art, the present invention has the following beneficial technical effects:

[0042] The present invention provides a quality control method for surfacing welding repair of a drill tool stabilizer straightening belt. The method includes inspecting and determining cracks in the base of the drill tool stabilizer after removing the original alloy column, surfacing metal, and heat-affected zone, and taking corresponding treatment measures to eliminate the impact of the original crack defect on the quality of the drill tool stabilizer surfacing welding repair. If the crack length and depth do not exceed the standard requirements, surfacing welding can be performed after the crack is removed. Before surfacing welding, the carbon equivalent is calculated based on the material of the drill tool stabilizer, and reasonable preheating temperature, welding process parameters, and post-weld cooling or heat treatment methods are determined to ensure the repair quality from a process perspective. The quality control method adopted can effectively control the surfacing welding repair process of the drill tool stabilizer, ensure its quality reliability, and prevent the drill tool stabilizer from breaking due to welding cracks after multiple repairs.

[0043] Furthermore, a calculation formula for the carbon equivalent of the drill tool stabilizer material is given. This formula is universal for the drill tool stabilizer material and has wide applicability. It is convenient and quick to calculate the carbon equivalent, preparing for the subsequent welding process.

[0044] Furthermore, crack inspection and determination are carried out on the weld overlay layer and the heat-affected zone of the substrate after the weld overlay has cooled or after heat treatment, and measures are taken to strictly control the quality of the repair process. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 A flow chart of the quality control method for surfacing welding repair of the drill tool stabilizer centralizing belt;

[0046] Figure 2 This is a structural diagram of a drilling tool stabilizer;

[0047] Among them, 1. Drill tool stabilizer base; 2. Steering belt; 3. Alloy column. DETAILED DESCRIPTION

[0048] In order to make the purpose, technical solutions and advantages of the present invention more clear, the following is a further detailed description 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 invention and are not intended to limit the present invention. That is, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments.

[0049] The components described and illustrated in the drawings and embodiments of the present invention may be arranged and designed in a variety of different configurations. Therefore, the detailed description of the embodiments of the present invention provided in the following drawings is not intended to limit the scope of the claimed invention, but merely represents a selected embodiment of the present invention. All other embodiments derived by those skilled in the art based on the drawings and embodiments of the present invention without inventive effort shall fall within the scope of protection of the present invention.

[0050] It should be noted that the terms "comprises", "includes" or any other variations are intended to cover non-exclusive inclusion, so that a process, element, method, article or apparatus that includes a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to the process, element, method, article or apparatus.

[0051] The present invention discloses a quality control method for surfacing welding repair of a drilling tool stabilizer centralizing belt, comprising the following steps:

[0052] S1. Check whether the drill stabilizer is repairable;

[0053] After inspection, if the drill tool stabilizer cannot be repaired, it will be scrapped; if the drill tool stabilizer can be repaired, enter S2;

[0054] S2, removing the original alloy column 3 and the original cladding layer metal and heat-affected zone of the drill tool stabilizer to be repaired;

[0055] S3. Check whether there are cracks on the base to be welded of the drill tool stabilizer straightening belt 2;

[0056] After inspection, if there is no crack on the base body of the drill tool stabilizer to be welded, directly proceed to S6; if there is a crack on the base body to be welded, proceed to S4;

[0057] S4. Determine whether the crack depth and length on the base body to be surfacing-welded of the drill tool stabilizer centralizing belt 2 exceed the standard requirements;

[0058] If the crack length or depth exceeds the standard requirements, the system will be scrapped; if the crack length or depth does not exceed the standard requirements, the system will proceed to S5;

[0059] S5. Clear the cracks that do not exceed the standard on the base body to be surfacing welded on the drill tool stabilizer straightening belt 2;

[0060] S6. Determine the material of the drill tool stabilizer to be repaired and calculate its carbon equivalent;

[0061] S7. Determine the preheating temperature, welding process parameters and post-weld cooling or heat treatment process for cladding repair based on the material and carbon equivalent of the drill tool stabilizer;

[0062] S8, surfacing metal on the base of the drill tool stabilizer centralizing belt 2 according to the preheating temperature and welding process determined in S7;

[0063] S9. Perform post-weld treatment according to the post-weld cooling or heat treatment process determined in S7;

[0064] After the post-weld treatment is completed, subsequent processing and inspection are carried out to complete the surfacing repair.

[0065] The features and performance of the present invention are further described in detail below with reference to the embodiments.

[0066] Combined with attachment Figure 1 and Figure 2 , taking the surfacing welding repair procedure and quality control method of the stabilizer belt of the 287mm diameter spiral drilling tool as an example.

[0067] The repair procedure and quality control method for the 287mm diameter spiral drilling tool stabilizer belt surfacing welding include the following steps:

[0068] S1. Check whether the stabilizer of the 287mm diameter spiral drill is repairable:

[0069] Use visual inspection and magnetic particle inspection or ultrasonic inspection to check whether there are any appearance defects and cracks that seriously affect safety of use.

[0070] After inspection, if the drill tool stabilizer cannot be repaired, it will be scrapped;

[0071] If the drill tool stabilizer can be repaired, the process proceeds to the next step S2.

[0072] S2, removing the original alloy column 3 and the original cladding layer metal and heat-affected zone of the drill tool stabilizer to be repaired;

[0073] Use a grinding wheel to knock off the main body of the straightening strip around the alloy column 3 and remove the original alloy column 3; then use a lathe to turn the outer diameter of the original straightening strip 2 surfacing metal flat and remove the re-welding heat affected zone.

[0074] S3. Use ultrasonic testing method to check whether there are crack defects on the base body of the drill stabilizer straightening belt 2 to be welded?

[0075] After inspection, if there are no cracks on the base body of the drill tool stabilizer to be welded, directly proceed to step S6;

[0076] If there are cracks on the base material to be welded, the next step S4 is entered;

[0077] S4. Determine whether the crack depth and length on the base to be welded on the drill tool stabilizer straightening belt 2 exceed the standard requirements?

[0078] If the crack length or depth exceeds the standard requirements, it will be scrapped;

[0079] If the crack length or depth does not exceed the standard requirements, proceed to step S5;

[0080] S5. Clear the cracks that do not exceed the standard on the base body to be surfacing welded on the drill tool stabilizer straightening belt 2;

[0081] S6. Determine the material of the drill tool stabilizer to be repaired and calculate its carbon equivalent:

[0082] The material of the 287 mm diameter spiral drill stabilizer was confirmed to be 4145H, and its chemical composition is shown in Table 1. The base material of the drill stabilizer is a medium-carbon steel with high content of Cr and Mo alloying elements. Therefore, the carbon equivalent is calculated using the following formula (1) to be 0.859%.

[0083] Table 1 Chemical composition of 287 mm diameter spiral drill stabilizer

[0084]

[0085] CE AWS =C+Mn / 6+Si / 24+Ni / 15+Cr / 5+Mo / 4+Cu / 13+P / 2 (1)

[0086] S7. Based on the material and carbon equivalent of the drill tool stabilizer, determine the preheating temperature, welding process parameters and post-weld cooling or heat treatment process for the cladding repair, see Table 2 below.

[0087] Table 2 Surfacing welding repair process of 287mm diameter spiral drill stabilizer

[0088]

[0089] S8. Based on the preheating temperature and welding process determined in S7, weld a weld metal with a thickness of 20 mm to 40 mm on the base of the drill tool stabilizer centralizing belt 2;

[0090] S9. Perform post-weld cooling according to the method determined in S7;

[0091] Wrap the centralizing belt 2 and the substrate with a length of at least 250 mm at both ends with asbestos cloth, tie it tightly and cool it slowly for more than 24 hours until the temperature of the centralizing belt 2 and the substrate repaired by the drilling tool stabilizer is lower than 100°C.

[0092] S10. Check whether there are cracks in the surfacing layer and heat-affected zone of the drill tool stabilizer?

[0093] First, use magnetic powder to detect whether there are welding cracks in the cladding layer and the heat-affected zone of the substrate;

[0094] If there is a crack, go to step S4 and use ultrasonic testing to determine whether the crack depth and length exceed the standard; repeat the above steps S4, S5, S8, and S9;

[0095] If there is no crack, proceed to the next step S11;

[0096] S11, machining the outer circle of the centralizing belt 2 after surfacing welding to a certain diameter, and trimming the edge of the centralizing belt 2 to make it smooth;

[0097] According to the repair size requirements, the outer circle of the centralizing belt 2 after surfacing welding is processed to a diameter of 222mm, and the edge of the centralizing belt 2 is trimmed and smoothed using an angle grinder;

[0098] S12, drilling a certain number of circular holes on the surfacing layer centralizing belt 2 according to the diameter of the alloy column 3;

[0099] The alloy column 3 to be embedded has a diameter of d0=15 mm and a length of l0=20 mm.

[0100] The diameter of the drilled hole is D = d0 - 0.25 = 15 - 0.25 = 14.75 mm, and the depth of the hole is LL = l0 + 0.5 mm, which is determined by the outer diameter d0 and length l0 of the embedded alloy column 3. Here, D = d0 - 0.25 mm, and L = l0 + 0.5 = 20 + 0.5 = 20.5 mm.

[0101] The arrangement direction of the drilled circular holes is perpendicular to the edge of the centralizing belt 2.

[0102] S13, embedding a wear-resistant alloy column 3 in the circular hole of the cladding layer;

[0103] S14. Check whether the alloy column 3 is firmly embedded.

[0104] If there is a gap between the alloy pillar 3 and the circular hole or the inlay is not firm, return to the previous step S13, remove the alloy pillar 3, and re-insert an alloy pillar 3 of appropriate size;

[0105] If the alloy column 3 is firmly embedded in the circular hole of the surfacing layer, the entire process is completed and the product can be put into use.

[0106] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered by the scope of protection of the claims of the present invention.

Claims

1. A quality control method for surfacing welding repair of a drill tool stabilizer centralizing belt, characterized in that: The steps include: S1. Check whether the drill stabilizer is repairable; After inspection, if the drill tool stabilizer cannot be repaired, it will be scrapped; if the drill tool stabilizer can be repaired, enter S2; S2, removing the original alloy column (3) and the original cladding metal and heat-affected zone of the drill tool stabilizer to be repaired; S3, check whether there are crack defects on the base body to be welded of the drill tool stabilizer straightening belt (2); After inspection, if there is no crack on the base body of the drill tool stabilizer to be welded, directly proceed to S6; if there is a crack on the base body to be welded, proceed to S4; S4, judging whether the crack depth and length on the base body to be welded of the drill tool stabilizer straightening belt (2) exceed the standard requirements; If the crack length or depth exceeds the standard requirements, the system will be scrapped; if the crack length or depth does not exceed the standard requirements, the system will proceed to S5; S5. Clear the cracks that do not exceed the standard on the base body to be welded on the drill tool stabilizer straightening belt (2); S6. Determine the material of the drill tool stabilizer to be repaired and calculate its carbon equivalent; S7. Determine the preheating temperature, welding process parameters and post-weld cooling or heat treatment process for cladding repair based on the material and carbon equivalent of the drill tool stabilizer; S8, surfacing metal on the base of the drill tool stabilizer straightening belt (2) according to the preheating temperature and welding process determined in S7; S9. Perform post-weld treatment according to the post-weld cooling or heat treatment process determined in S7; After the post-weld treatment is completed, subsequent processing and inspection are carried out to complete the surfacing repair.

2. The quality control method for surfacing welding repair of a drill tool stabilizer centralizing belt according to claim 1 is characterized in that: In S1, the drill tool stabilizer repairability inspection refers to checking whether the drill tool stabilizer base (1) has appearance defects and cracks that seriously affect the safety of use; the inspection method is visual inspection, magnetic particle inspection or ultrasonic inspection.

3. The quality control method for surfacing welding repair of a drill tool stabilizer centralizing belt according to claim 1 is characterized in that: In S6, the carbon equivalent calculation formula is: WHAT AWS =C+Mn / 6+Si / 24+Ni / 15+Cr / 5+Mo / 4+Cu / 13+P / 2。 4. The quality control method for surfacing welding repair of a drill tool stabilizer centralizing belt according to claim 1 is characterized in that: S2 specifically includes: knocking off the main body of the straightening strip around the alloy column (3) and taking out the original alloy column (3); turning the outer diameter of the original straightening strip (2) surfacing metal flat and removing the original welding heat-affected zone.

5. The quality control method for surfacing welding repair of a drill tool stabilizer centralizing belt according to claim 1 is characterized in that: In S3, the method for inspecting whether the substrate to be welded has cracks is ultrasonic testing.

6. The quality control method for surfacing welding repair of a drill tool stabilizer centralizing belt according to claim 1 is characterized in that: In S8, the welding rod used for surfacing welding on the base of the drill tool stabilizer straightening belt (2) is E5015 or E6015 low hydrogen alkaline welding rod; the thickness of the surfacing layer metal is 20mm-40mm.

7. The quality control method for surfacing welding repair of a drill tool stabilizer centralizing belt according to claim 1 is characterized in that: In S9, the post-weld cooling process is specifically as follows: wrap the centralizing belt (2) and the base body with a length of at least 250 mm at both ends with asbestos cloth, tie them tightly and cool them slowly for more than 24 hours until the temperature of the centralizing belt (2) and the base body repaired by the surfacing welding of the drill tool stabilizer is lower than 100°C.

8. The quality control method for surfacing welding repair of a drill tool stabilizer centralizing belt according to claim 1 is characterized in that: In S9, subsequent processing and inspection include the following steps: S10. Check whether there are cracks in the surfacing layer and heat-affected zone of the drill tool stabilizer; If cracks exist, go to S4 and repeat S4, S5, S8 and post-weld treatment; if cracks do not exist, go to S11; S11, processing the outer circle of the centralizing belt (2) after surfacing welding, and trimming the edge of the centralizing belt (2) to make it smooth; S12, drilling a circular hole on the surfacing layer straightening belt (2) according to the diameter of the alloy column (3); S13, embedding a wear-resistant alloy column (3) in the circular hole of the cladding layer; S14, check whether the alloy column (3) is firmly embedded; if there is a gap between the alloy column (3) and the circular hole or the embedding is not firm, return to S13, take out the alloy column (3), and re-embed the alloy column (3); if the alloy column (3) is firmly embedded in the circular hole of the surfacing layer, the process ends.

9. The quality control method for surfacing welding repair of a drill tool stabilizer centralizing belt according to claim 1, characterized in that: In S10, the crack inspection method of the cladding layer and the heat-affected zone of the substrate is: first, magnetic particle inspection is used to detect whether there are welding cracks in the cladding layer and the heat-affected zone of the substrate; if cracks exist, ultrasonic inspection is used to determine whether the crack depth and length exceed the standard.

10. The quality control method for surfacing welding repair of a drill tool stabilizer centralizing belt according to claim 1, characterized in that: In S12, the diameter D and depth L of the drill hole on the surfacing layer are determined according to the outer diameter d0 and length l0 of the embedded alloy column (3). Wherein, D=d0-0.25mm, L=l0+0.5mm; The circular holes drilled on the surfacing layer are arranged in a direction perpendicular to the edge of the straightening belt (2).

Images