Method and system for identifying lithology in real time in drilling process
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A lithology and drilling technology, which is applied in character and pattern recognition, earthwork drilling, wellbore/well components, etc., can solve problems such as difficulties in obtaining real-time lithology information downhole, improve accuracy and timeliness, and improve downhole Tool life, effect of increasing drilling speed
Pending Publication Date: 2022-02-22
CHINA PETROLEUM & CHEM CORP +1
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[0010] The purpose of the present invention is to solve the problems existing in the above-mentioned prior art, provide a method and system for real-time identification of lithology during drilling, and solve the problem of difficulty in real-time acquisition of downhole lithology information during drilling
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Embodiment 1
[0080] The methods include:
[0081] (1) Collect adjacent well data: collect time series logging data and drilling data of adjacent wells to be drilled.
[0082] The time series logging data and drilling data include: vertical depth, slant depth, displacement, weight on bit, rotational speed, hook load, inlet flow rate, drilling fluid density, ROP, turntable torque, bit size and bit type.
[0083] (2) Build feature sets and label sets: use the time series logging data and drilling data of the adjacent wells to build feature sets and label sets, specifically including:
[0084] (21) According to the oblique depth, displacement, rotational speed and WOB in the mud logging data, screen the data belonging to the drilling condition: screen out the mud logging data that meet the following conditions from the mud logging data, and the data used later is the The mud logging data screened out in the steps and the corresponding drilling data;
[0085] Q i >1L / s and MD i >MD i-1 and...
Embodiment 2
[0127] Such as Figure 6 As shown, the second aspect of the present invention provides a kind of lithology identification system, and described lithology identification system comprises: historical data processing unit 10, basic model building unit 20, real-time data processing unit 30, model correction and lithology Sex recognition unit 40, result output unit 50.
[0128] The historical data processing unit 10 is used to collect and store the mud logging data and drilling data of adjacent wells, and utilize the mud logging data and drilling data to construct feature sets and label sets; feature set and label set;
[0129] The basic model building unit 20 is connected with the historical data processing unit 10, and uses the feature set and the label set constructed by the historical data processing unit 10 to train the basic model of lithology identification; specifically, adopt the steps (3) in the above method ) to train the basic model of lithology identification;
[01...
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Abstract
The invention provides a method and a system for identifying lithology in real time in a drilling process, and belongs to the technical field of petroleum and natural gas exploration and development. The method comprises the following steps: (1) collecting adjacent well data; (2) constructing a feature set and a label set: constructing the feature set and the label set by utilizing adjacent well data; (3) training a lithology identification basic model: training the lithology identification basic model by using the feature set and the label set; (4) correcting the lithology identification basic model in real time; and (5) lithology real-time identification: carrying out lithology real-time identification by using the corrected lithology identification basic model to obtain the type of lithology. According to the method, based on the data of the drilled adjacent well, the lithology identification basic model is established by using the random forest method, and the basic model is corrected by using the probability model, so that the prediction error of the model caused by the difference of geological and engineering conditions in new well deployment is avoided, and the accuracy and timeliness of lithology identification are greatly improved, and basis is provided for improving drilling speed, reducing drill bit abrasion and prolonging service life of downhole tools.
Description
technical field [0001] The invention belongs to the technical field of petroleum and natural gas exploration and development, and in particular relates to a method and system for real-time identification of lithology during drilling. Background technique [0002] In the process of oil drilling, the adjustment of drilling parameters is mainly based on the judgment of downhole lithology. For formations with drastic lithology changes, timely adjustment of drilling parameters is of great significance for increasing drilling speed, reducing drill bit wear and improving the life of downhole tools. [0003] Chinese patent publication CN105888657B discloses a method for lithology identification of sedimentary rocks using element logging, which uses element logging measurement data as parameters, and establishes a set of lithology identification models by analyzing the chemical composition and diagenetic principles of various lithologies , which solves the problem of lithology while ...
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