Shocker quality appraisal

As a core tool in the fields of oil drilling and geological exploration,

jar uses impact energy transfer and buffering control as its core principles. By optimizing structural design and material heat treatment process, it achieves a balance between fatigue resistance and impact resistance under high-frequency impact. It is widely used in complex working conditions such as deep well drilling, rock formation crushing, and downhole accident handling. In oil drilling, it is used to relieve drilling tools from getting stuck and improve drilling efficiency; in the field of geological exploration, it can achieve efficient crushing of hard rock formations; in underground operations, it can ensure the safe release and reset of tool strings. Compared with traditional impact tools, jars have the characteristics of precise and controllable energy release, strong resistance to alternating loads, and long service life. They are key equipment for safe and efficient operations in oil and gas resource development and geological engineering.

Zhongke Testing is a product quality appraisal service organization registered with the court. It can provide jar quality appraisal services. It has a professional appraisal team and advanced instruments and equipment to provide fair and accurate appraisal results for jar quality appraisal.

With the high-intensity application of jars under complex working conditions, related quality dispute cases are increasing year by year. The focus of judicial disputes mainly focuses on:

1. Disputes over performance indicators: whether the actual impact energy output meets the standard and whether the pressure sealing performance complies with the technical agreement;

2. Material defects: insufficient fatigue resistance caused by alloy composition deviation and improper heat treatment process Brittle fracture;

3. Structural and process problems: Insufficient machining accuracy of key components (such as rams, spline shafts), and the thickness of the surface hardened layer is not up to standard;

4. Division of use responsibilities: Identification of the causal relationship between operating parameters exceeding limits or improper maintenance and inherent defects of the product.

0 Such cases require comprehensive determination of the root cause of jar failure through mechanical performance testing, microstructure analysis and working condition simulation experiments.

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jar quality appraisal usually uses the following technical methods:

1. Appearance inspection: Check the overall appearance of the jar to see if there are any defects such as deformation, cracks, etc.

2. Dimensional measurement: Measure the key dimensions of the jar, such as vibration amplitude, vibration frequency, etc., to see if they meet the design requirements.

3. Performance test: Conduct actual vibration tests on the jar to evaluate whether its vibration performance meets expectations.

4. Material analysis: Analyze the materials of key components of the jar to determine whether the material quality and workmanship meet the standards.

05. Fault analysis: Analyze the faulty jar to find out the cause of the fault and improvement measures.

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An oilfield service company of the applicant purchased 20 sets of HY-780 jars from a machinery manufacturing factory of the respondent for use in shale gas well operations. The contract stipulated that the single impact energy should not be less than 78kJ. In actual use, the spline shafts of 5 sets of jars broke within 300 cycles, resulting in drilling tool jamming accidents. The oilfield company claimed that the product had heat treatment defects, and the manufacturer argued that it was caused by excessive lateral loads caused by excessive well inclination angles.

Identification analysis results:

The quality analysis expert group discussed and comprehensively analyzed the relevant information of the "jar", contract technical agreements, on-site investigation case materials and other data, and made the following quality analysis opinions:

HTMLT The surface hardness of the spline shaft of the AGTOKEN6 jar involved in the case is HRC52 (technical requirement HRC58-62), and there is an untempered martensite structure in the core, indicating an insufficient quenching cooling rate; energy spectrum analysis shows that the chromium content of the material is only 1.2% (the agreement requires 1.8%-2.2%), and the corrosion fatigue resistance is reduced; the fracture surface shows intergranular fracture characteristics, which is confirmed to be stress corrosion cracking caused by out-of-control heat treatment process. .

The manufacturer did not strictly implement heat treatment procedures and ingredient control, and there is a direct causal relationship between product defects and failure.

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jar quality appraisal report should include the following content:

1. The purpose and basis of the appraisal.

2. Model, specification, manufacturer and other information of the equipment being identified.

3. Identification method.

4. Identification results (including whether there are quality problems, causes of problems, etc.).

05. Identification conclusion.

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26. Signature and seal of the appraiser, and official seal of the appraisal institution.

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