Drilling fluid plugging performance evaluation method

A plugging performance and evaluation method technology, applied in suspension and porous material analysis, permeability/surface area analysis, measurement devices, etc., can solve the problems of inability to simulate downhole conditions, large spacing between sands, and large gaps, etc., to achieve The effect of short experiment period, simple experiment process and simple method

Inactive Publication Date: 2019-01-25
BC P INC CHINA NAT PETROLEUM CORP +1
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AI-Extracted Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome above-mentioned deficiencies in prior art, provide a kind of evaluation method of plugging performance of drilling fluid, have overcome in prior art 1: filter loss is evaluated plugging performance relatively one-side...
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Abstract

The invention discloses a drilling fluid plugging performance evaluation method which comprises the following steps: step 1), utilizing a low-temperature low-pressure filter press to measure the API filter loss of drilling fluid to be measured and taking filter cake; step 2) injecting clean water into a drilling fluid cup of the low-temperature low-pressure filter press, covering the drilling fluid cup by the filter cake obtained in step 1); step 3) under the experimental condition the same as the API filter loss of the drilling fluid to be measured, measuring initial permeable time and permeable amount of the filter cake in step 2) and evaluating the strength of the plugging performance of the drilling fluid according to the size of the permeable amount of the filter cake and the initialpermeable time. The evaluation method disclosed by the invention has the advantages that an experiment process is simple, the operability is strong, an experimental period is short, the experimental conditions are closer to the real downhole conditions, and the experimental data and the experimental results have stronger guidance for on-site drilling production; thus, the evaluation method is veryworth of popularization and application.

Application Domain

Permeability/surface area analysis

Technology Topic

EngineeringFilter cake +5

Examples

  • Experimental program(5)
  • Effect test(2)

Example Embodiment

[0020] The specific implementation of the present invention is described below in conjunction with examples:
[0021] It should be noted that the structure, ratio, size, etc. illustrated in this specification are only used to match the content disclosed in the specification for understanding and reading by those familiar with this technology, and are not used to limit the implementation of the present invention. Any structural modification, proportional relationship change or size adjustment should still fall within the scope of the technical content disclosed in the present invention without affecting the effects and objectives that the present invention can produce. .
[0022] At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" cited in this specification are only for the convenience of description and are not used to limit the text. The scope of implementation of the invention, the change or adjustment of the relative relationship, shall be regarded as the scope of implementation of the invention without substantial changes to the technical content.

Example Embodiment

[0023] Example 1
[0024] The invention discloses a method for evaluating the plugging performance of drilling fluid, which includes the following steps:
[0025] Step 1): Use a low-temperature and low-pressure filter loss instrument to measure the API filter loss of the drilling fluid to be tested, and obtain the filter cake;
[0026] Step 2): Pour clean water into the drilling fluid cup of the low temperature and low pressure filter loss instrument, and cover the filter cake obtained in step 1) on the drilling fluid cup;
[0027] Step 3): Under the same experimental conditions as determining the API fluid loss of the drilling fluid to be tested, measure the initial water permeability time and water permeability of the filter cake in step 2), and evaluate the drilling based on the size of the filter cake water permeability and the initial water permeability time The sealing ability of the liquid is strong or weak.

Example Embodiment

[0028] Example 2
[0029] The invention discloses a method for evaluating the plugging performance of drilling fluid, which includes the following steps:
[0030] Step 1): Use a low-temperature and low-pressure filter loss instrument to measure the API filter loss of the drilling fluid to be tested, and obtain the filter cake;
[0031] Step 2): Pour clean water into the drilling fluid cup of the low temperature and low pressure filter loss instrument, and cover the filter cake obtained in step 1) on the drilling fluid cup;
[0032] Step 3): Under the same experimental conditions as determining the API fluid loss of the drilling fluid to be tested, measure the initial water permeability time and water permeability of the filter cake in step 2), and evaluate the drilling based on the size of the filter cake water permeability and the initial water permeability time The sealing ability of the liquid is strong or weak.
[0033] Preferably, in the step 1), the pressure at which the API fluid loss of the drilling fluid to be tested measured by the low-temperature and low-pressure fluid loss meter is 690±35kPa, wherein the shape of the filter cake obtained is a round cake structure, and the cross-sectional area of ​​the filter cake is 45.8±0.6cm 2.

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Description & Claims & Application Information

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