Quality control method for righting belt surfacing repair of drilling tool stabilizer

Abstract

The invention belongs to the technical field of drilling tool stabilizers, and particularly relates to a quality control method for righting and surfacing repair of a drilling tool stabilizer, which comprises the following steps of: performing crack inspection and judgment on a base body of the drilling tool stabilizer without an original alloy column, surfacing layer metal and a heat affected zone, and taking corresponding treatment measures; the influence of original crack defects on the surfacing repair quality of the drilling tool stabilizer is eliminated; if the length and depth of the crack do not exceed the standard requirements, surfacing can be carried out after the crack is removed, the carbon equivalent is calculated according to the material of the drilling tool stabilizer before surfacing, the reasonable preheating temperature, welding process parameters and post-welding cooling or heat treatment mode are determined, and the repair quality is guaranteed from the process; the adopted quality control method can effectively control the surfacing repair technological process of the drilling tool stabilizer, the quality reliability of the drilling tool stabilizer is guaranteed, and fracture accidents caused by welding cracks after multiple times of repair of the drilling tool stabilizer are prevented.

Description

Technical Field

[0001] The invention belongs to the technical field of drill tool stabilizers, and in particular relates to a quality control method for surfacing welding repair of a drill tool stabilizer straightening 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 stabilizing and straightening role in the drilling process, increase the rigidity of the drill string and prevent well deviation. There are many types of drill tool stabilizers, such as Figure 2 As shown in the figure, the structure is composed of a drill tool stabilizer base 1 and a wear-resistant straightening belt 2. During the drilling operation, the hard well wall rock makes the wear-resistant layer of the stabilizer easily worn and loses its due function. Therefore, after the drill tool stabilizer has been used for a period of time, the straightening belt 2 needs to be welded and repaired several times before it can be used normally. Otherwise, it can only be scrapped, which causes great waste.

[0003] There are three main methods for repairing the drill tool stabilizer straightening belt 2:

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

[0005] Second, using oxygen-acetylene flame or plasma spray welding to weld hard alloy strips and clad nickel-copper alloy powder on the stabilizer straightening 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 stabilizer straightening belt 2 substrate, 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 has a longer wear-resistant time after repair.

[0008] However, the material of the drill tool stabilizer is usually 35CrMo, 40CrNiMo, 40CrMnMo or 42CrMo steel, which is a high-quality chromium-molybdenum alloy steel with high carbon content and alloying elements such as Cr and Mo, and high carbon equivalent (CE). Therefore, the weldability of the drill tool stabilizer is poor. During the cladding repair process, if the process parameters are not properly controlled and the necessary quality control procedures are lacking, the repair quality and reliability are poor, and cracks are likely to occur on the drill tool stabilizer body. During drilling operations, the drill tool stabilizer is prone to fracture failure due to cracks on the body under complex working conditions such as pressure, temperature and alternating loads, causing huge 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 straightening 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 drilling tool stabilizer straightening 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 and the original cladding metal and heat-affected zone of the drill tool stabilizer to be repaired;

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

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

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

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

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

[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 according to the material and carbon equivalent of the drill tool stabilizer;

[0022] S8, surfacing metal on the drill tool stabilizer straightening belt substrate according to the preheating temperature and welding process determined in S7;

[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, follow-up 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 matrix 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] Further, 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 to make it smooth, and removing the original welding heat affected zone.

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

[0030] Furthermore, in S8, the welding rod used for surfacing welding on the substrate of the drill tool stabilizer straightening belt is E5015 or E6015 low-hydrogen alkaline welding rod; the metal thickness of the surfacing layer 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, and tie them up and slowly cool them for more than 24 hours until the temperature of the centralizing belt and the substrate repaired by the drill bit stabilizer surfacing welding is lower than 100°C.

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

[0033] S10, check whether there are cracks in the cladding layer and heat-affected zone of the drill 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 straightening belt of the cladding layer according to the diameter of the alloy column;

[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, take out 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 method for inspecting cracks in the cladding layer and the heat affected zone of the substrate is: firstly, magnetic particle detection 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 detection method is used to determine whether the crack depth and length exceed the standard.

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

[0040] The circular holes drilled on the cladding layer are arranged perpendicular to the edge of the straightening 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, which performs crack inspection, determination and corresponding treatment measures on the base of the drill tool stabilizer after removing the original alloy column, surfacing layer metal and heat-affected zone, so as to eliminate the influence of the original crack defect on the quality of surfacing welding repair of the drill tool stabilizer; 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 according to 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 adopted quality control method 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 a wide range of applicability. It is convenient and quick to calculate the carbon equivalent and prepare for the subsequent welding process.

[0044] Furthermore, crack inspection, determination and measures are taken on the weld overlay layer and heat-affected zone of the substrate after cooling or heat treatment 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 drilling tool stabilizer straightening belt;

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

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

[0048] In order to make the purpose, technical solution and advantages of the present invention more clear, the following is further described in detail 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 used to limit the present invention, that is, the embodiments described are only part of the embodiments of the present invention, not all embodiments.

[0049] The components described and shown in the drawings and embodiments of the present invention may be arranged and designed in various 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. Based on the drawings and embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are 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 equipment 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 equipment.

[0051] The invention discloses a quality control method for surfacing welding repair of a drilling tool stabilizer straightening 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 crack defects on the base body to be clad-welded of the drill tool stabilizer straightening belt 2;

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

[0057] S4, judging whether the crack depth and length on the base body to be clad-welded of the drill tool stabilizer straightening belt 2 exceed the standard requirements;

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

[0059] S5. Clear the cracks that do not exceed the standard on the base body to be clad in the drilling 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 according to the material and carbon equivalent of the drill tool stabilizer;

[0062] 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;

[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, follow-up processing and inspection are carried out to complete the surfacing repair.

[0065] The features and performances of the present invention are further described in detail below in conjunction with the embodiments.

[0066] Combined with 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 of 287mm diameter spiral drilling tool stabilizer belt surfacing welding includes 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 in use.

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

[0071] If the drill tool stabilizer can be repaired, the next step S2 is entered.

[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 machine to knock off the main body of the straightening strip around the alloy column 3 and take out the original alloy column 3; then use a lathe to turn the outer diameter of the original straightening belt 2 to make it smooth and remove the heat-affected zone of the re-welding.

[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 stabilizer to be welded, directly proceed to step S6;

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

[0077] S4. Determine whether the crack depth and length on the base body 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, the process proceeds to step S5;

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

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

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

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

[0084]

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

[0086] S7. According to 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 cladding repair as shown in Table 2 below.

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

[0088]

[0089] S8, according to the preheating temperature and welding process determined in S7, surfacing welding of welding metal with a thickness of 20 mm to 40 mm on the base of the drilling tool stabilizer straightening belt 2;

[0090] S9, perform post-weld cooling in the manner 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 them up and slowly cool them 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 weld overlay and heat affected zone of the drill bit stabilizer?

[0093] First, use magnetic particle detection 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 surfacing-welded straightening belt 2 to a certain diameter, and trimming and smoothing the edge of the straightening belt 2;

[0097] According to the repair size requirements, the outer circle of the surfacing-welded straightening belt 2 is processed to a diameter of 222 mm, and the edge of the straightening belt 2 is trimmed and smoothed with an angle grinder;

[0098] S12, drilling a certain number of circular holes on the surfacing layer straightening 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 circular hole D = d0-0.25 = 15-0.25 = 14.75 mm, and the depth of the circular hole LL = l0 + 0.5 mm are determined according to the outer diameter d0 and length l0 of the embedded alloy column 3. Among them, D = d0-0.25 mm, 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 straightening 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 column 3 and the circular hole or the inlay is not firm, return to the previous step S13, take out the alloy column 3, and re-inlay an alloy column 3 of a suitable size;

[0105] If the alloy column 3 is firmly embedded in the circular hole of the surfacing layer, the whole process is completed and 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 rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant 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 within the scope of protection of the claims of the present invention.

Claims

1. A quality control method for surfacing welding repair of a drill stabilizer straightening 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 are no cracks on the base body to be welded on the drill tool stabilizer, directly proceed to S6; if there are cracks on the base body to be welded on, 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 equipment will be scrapped; if the crack length or depth does not exceed the standard requirements, the process 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 according to 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, follow-up processing and inspection are carried out to complete the surfacing repair.

2. A quality control method for surfacing welding repair of a drill stabilizer straightening belt according to claim 1, 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 stabilizer straightening 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 stabilizer straightening 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 welded metal of the original straightening strip (2) to make it smooth and removing the original welding heat affected zone.

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

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

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

8. The quality control method for surfacing welding repair of a drill stabilizer straightening 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 cladding 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 reinsert the alloy column (3); if the alloy column (3) is firmly embedded in the circular hole of the cladding layer, the process ends.

9. The quality control method for surfacing welding repair of a drill stabilizer straightening belt according to claim 1 is characterized in that: In S10, the method for inspecting cracks in the cladding layer and the heat-affected zone of the substrate is: firstly, magnetic particle detection 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 detection 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 stabilizer straightening belt according to claim 1, characterized in that: In S12, the diameter D and depth L of the drill hole on the cladding 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 cladding layer are arranged in a direction perpendicular to the edge of the straightening belt (2).

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