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Method of Reservoir Evaluation Based on Microdrilling Data While Drilling to Calculate Logging Porosity

A technology of micro-drilling and porosity, applied in earth-moving drilling, wellbore/well components, etc., can solve the problems of high cost, lack of porosity parameters, and fine particle size of cuttings samples, so as to save costs and improve drilling efficiency. Encounter rate, damage reduction effect

Active Publication Date: 2016-01-20
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 3. Logging while drilling for horizontal wells can realize reservoir evaluation while drilling, but it is expensive to purchase and rent foreign logging while drilling instruments, and most domestic logging while drilling parameters do not have porosity parameters
[0006] 4. The nuclear magnetic resonance logging applied in the field can analyze the porosity of core and cuttings samples, but the analysis time is long, and there are strict requirements on the particle size of cuttings samples
At present, drilling technologies such as PDC bit and gas drilling are widely used in the drilling process, resulting in fine particles of cuttings samples, which cannot meet the requirements of nuclear magnetic logging analysis.
[0007] 5. The comprehensive mud logging data can reflect the physical properties of the formation to a certain extent, but the qualitative judgment of the reservoir has been mainly based on experience, using the change trend of the meter-drilling data, and there is no quantitative calculation of the logging parameters using the mud logging parameters. Well Porosity Methods

Method used

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  • Method of Reservoir Evaluation Based on Microdrilling Data While Drilling to Calculate Logging Porosity
  • Method of Reservoir Evaluation Based on Microdrilling Data While Drilling to Calculate Logging Porosity
  • Method of Reservoir Evaluation Based on Microdrilling Data While Drilling to Calculate Logging Porosity

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Effect test

Embodiment 1

[0036] The invention discloses a method for evaluating reservoirs by using data during micro-drilling to calculate logging porosity while drilling, comprising the following steps:

[0037] a. Collect micro-drilling time data of drilled wells;

[0038] b. Combining the drilled micro-drilling data and the corresponding formation porosity data to establish a correlation model between the micro-drilling data and the formation porosity data;

[0039] c. According to the established correlation model between the micro-drilling data and formation porosity data, the logging porosity is calculated while drilling using the micro-drilling data while drilling;

[0040] d. Combined with cuttings logging data, set the formation porosity of the conventional tight lithology section to a default value lower than the lower limit standard of reservoir porosity, and complete the reservoir evaluation.

Embodiment approach

[0042] Refer to the attached figure 1 , 2 And 3, the best mode of implementation of the present invention is as follows:

[0043] A method for evaluating reservoirs by calculating mud logging porosity while drilling using micro-drilling data, the steps comprising:

[0044] 1. Collect the micro-drilling time data of the same layer that has been drilled in the same block, and combine the corresponding formation porosity data to establish a correlation model between the regional micro-drilling time data and the formation porosity data.

[0045] The corresponding formation porosity data is: relatively accurate formation porosity data obtained by various means, which may be logging interpretation porosity data, core analysis porosity data, and the like.

[0046] The correlation model between the micro-drilling time data and formation porosity data of the establishment area is as follows: using the micro-drilling time data and the corresponding porosity data of the same layer that...

Embodiment 3

[0055] The following are concrete application examples of the present invention:

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Abstract

The invention discloses a method for reservoir assessment by calculating logging porosity while drilling by utilizing data during micro drilling. The method comprises the following steps of: (a) collecting data during the micro drilling of drilled wells; (b) establishing a correlation model of the data during the micro drilling and formation porosity data by combining the data during the micro drilling of the drilled wells and the corresponding formation porosity data; (c) according to the established correlation model of the data during the micro drilling and the formation porosity data, calculating the logging porosity while drilling by utilizing data during the micro drilling of a well drilled at present; and (d) setting a formation porosity of a conventional dense lithological section to be a default which is lower than the lower limit standard of the formation porosity by combining with cutting logging data to finish the reservoir assessment. According to the method, the calculation of the logging porosity during drilling is realized, the real-time evaluation of reservoir during drilling is strengthened, steps are simple and easy to apply, and the logging porosity can be quantitatively calculated for carrying out the reservoir assessment.

Description

technical field [0001] The invention relates to the technical field of petroleum and natural gas exploration and development, in particular to a method for evaluating reservoirs by using micro-drilling data to calculate logging porosity while drilling. Background technique [0002] Reservoir evaluation is an important link in oil and gas exploration and development, and formation porosity is the main parameter for understanding reservoirs. In the past methods for obtaining formation porosity, logging and mud logging have adopted various methods, but all have their own limitations: [0003] 1. Using conventional and imaging logging data to interpret porosity is the most commonly used method, but it has hysteresis and belongs to post-drilling evaluation. [0004] 2. Porosity measurement by core is the most accurate method, but there are generally few core wells, and only some key wells are cored in key intervals. [0005] 3. Logging while drilling for horizontal wells can re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B49/00
Inventor 唐家琼唐谢庞江平吴萍韩贵生朱茜霞王滢阮聪
Owner BC P INC CHINA NAT PETROLEUM CORP
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