Wellbore Quality Evaluation Method for Cementing
A technology of wellbore quality and evaluation method, applied in construction and other directions
Active Publication Date: 2022-03-01
PETROCHINA CO LTD
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Problems solved by technology
[0003] The existing wellbore quality evaluation method only evaluates the wellbore quality separately for a certain factor that affects the wellbore quality, and does not combine all the factors that affect the wellbore quality to evaluate the wellbore quality
Method used
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Effect test
Embodiment 1
[0056] (1) Divide the 2723-3454m well section into one well section every 0.125m
[0057] Well D33-56 has been drilled to a depth of 3469m, and the wellbore structure is The depth of the casing in the oil layer was 3454m, and the design cement return depth was 2723m, but it did not return to the upper casing. Therefore, the quality of the cementing well body in the 2723-3454m well section was evaluated. The 2723-3454m well section is divided into one well section every 0.125m, a total of 241 well sections.
[0058] (2) Factor set for determining the wellbore quality for cementing
[0059] Determine D33-56 oil layer casing cementing well body quality = {well diameter regularity, well diameter expansion rate, mud cake thickness, full angle change rate, well inclination angle}.
[0060] Obtain the logging data of the well section to be evaluated: such as borehole diameter, well inclination angle, and azimuth data, and calculate the borehole expansion rate, borehole regularit...
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The invention discloses a method for evaluating the quality of a well body for well cementing. The method comprises: a), dividing the drilling well to be evaluated for the quality of the cementing well into multiple sections; b), determining the factor set affecting the quality of the cementing well; c), determining the weight of each factor in the factor set Fuzzy set; d), select a section of the well section in the multi-section well section of the cementing well quality to be evaluated in a) as the well section of the cementing well quality to be evaluated; e), determine the well in d) The membership function of each factor in the factor set corresponding to the section; f), according to the weight fuzzy set of each factor and the membership function of each factor in the factor set corresponding to the well section to the cementing well body of the well section in d) Carry out fuzzy evaluation on the quality; g), repeat d) to f) to carry out fuzzy evaluation on the quality of the cementing wellbore for drilling. The wellbore quality evaluation method for cementing realizes the comprehensive fuzzy evaluation of the wellbore quality for drilling by performing fuzzy evaluation on each section of the well section.
Description
technical field [0001] The invention relates to a method for evaluating the quality of a well body for well cementing. Background technique [0002] Drilling engineering is a high-investment, high-risk, high-tech, and multidisciplinary complex industry in the process of oil and gas exploration and development. The quality of a well drilling construction will directly affect whether the well conforms to the drilling and geological design, whether the construction can be carried out normally, whether the oil and gas layers can be protected to the maximum extent, and whether the long-term normal production of the oil well can be guaranteed, etc., which in turn will affect Whether the huge investment can get an economically reasonable return. As domestic and foreign oil and gas investors invest more and more in drilling, the requirements for drilling quality are getting higher and higher. In order to ensure the quality of drilling construction, on-site quality evaluation is es...
Claims
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IPC IPC(8): E21B47/005
CPCE21B47/005
Inventor 吴华唐世忠李娟张学强曹磊滕国权李文娟杨涛
Owner PETROCHINA CO LTD