WO2021077938A1 - Procédé d'évaluation de la capacité d'un fluide de forage à consolider une paroi de puits et à briser la roche environnante - Google Patents

Procédé d'évaluation de la capacité d'un fluide de forage à consolider une paroi de puits et à briser la roche environnante Download PDF

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Publication number
WO2021077938A1
WO2021077938A1 PCT/CN2020/114848 CN2020114848W WO2021077938A1 WO 2021077938 A1 WO2021077938 A1 WO 2021077938A1 CN 2020114848 W CN2020114848 W CN 2020114848W WO 2021077938 A1 WO2021077938 A1 WO 2021077938A1
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Prior art keywords
drilling fluid
shear strength
sample
disc
contact surfaces
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PCT/CN2020/114848
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English (en)
Chinese (zh)
Inventor
梁利喜
刘向君
熊健
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西南石油大学
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Application filed by 西南石油大学 filed Critical 西南石油大学
Priority to CA3120909A priority Critical patent/CA3120909C/fr
Publication of WO2021077938A1 publication Critical patent/WO2021077938A1/fr

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    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
    • E21B49/005—Testing the nature of borehole walls or the formation by using drilling mud or cutting data

Definitions

  • the invention relates to the technical field of petroleum and natural gas drilling, in particular to an evaluation method for the ability of drilling fluid to consolidate the well wall and break surrounding rock.
  • the ability of drilling fluid to cement and consolidate the broken rock in the borehole wall is closely related to the lithology of the formation, that is, the same drilling fluid system has different cementing or consolidation abilities for different lithological formations; it is also affected by environmental temperature and pressure. , That is, the same lithological formation, the same drilling fluid system, but under the conditions of different formation temperature and pressure, its consolidation ability is also different. It is precisely because of the numerous factors affecting the cementation or consolidation ability of the broken rock of the borehole wall by the drilling fluid, and the difficulty of drilling and coring in the broken formation, for a long time, the performance evaluation of the drilling fluid has been mainly aimed at the intact formation and the formation with partial fractures.
  • the performance evaluation of the fluid-stabilized well wall also mainly focuses on the suppression performance, plugging performance, rheological performance, and wall-building performance of the drilling fluid. However, there are few evaluations on the cementing or consolidation ability of drilling fluids, and no systematic indoor evaluation method has been seen so far.
  • the present invention provides a method for evaluating the ability of drilling fluid to consolidate the wellbore and break surrounding rock, which solves the problem of inaccurate performance evaluation results of the drilling fluid stabilizing the wellbore.
  • the technical solution adopted by the present invention is: an evaluation method for the ability of drilling fluid to consolidate the well wall and break surrounding rock, including the following steps:
  • the maximum normal load is not higher than 1/20 of the uniaxial compressive strength UCS;
  • the two disc samples are attached and fixed along the cutting surface, placed in a pressure-resistant closed container filled with drilling fluid, and pressure and temperature are applied to the closed container for a period of time;
  • the diameter of the cylindrical sample is 50mm, and the length is 50mm.
  • the diameter of the standard plunger sample is 25mm and the length is 50mm.
  • the normal loads in the steps S3 and S5 both include 0 MPa, And ⁇ nMax , where ⁇ nMax is the maximum normal load.
  • ⁇ fs is the shear strength of the contact surface of the disc specimen
  • ⁇ n is the applied normal stress
  • Is the friction angle of the contact surface of the disc sample.
  • the magnitude of the applied pressure in the step S4 is equal to the formation pressure or the drilling fluid pressure, and the magnitude of the applied temperature is the actual temperature of the formation.
  • ⁇ df is the shear strength between the contact surfaces of the disc sample after the action of the drilling fluid
  • ⁇ n is the applied normal stress
  • C df is the cohesive force increase between the contact surfaces of the disc sample after the action of the drilling fluid.
  • the calculation formula for the increase in the shear strength of the drilling fluid and the increase in the friction angle of the drilling fluid is:
  • C ⁇ is the increase in shear strength of the drilling fluid
  • ⁇ df is the shear strength between the contact surfaces of the disc sample after the action of the drilling fluid
  • ⁇ fs is the resistance of the contact surface of the disc sample.
  • Shear strength Is the increase of the friction angle of the drilling fluid, Is the friction angle between the contact surfaces of the disc sample after the action of the drilling fluid, Is the friction angle of the contact surface of the disc sample.
  • the beneficial effects of the present invention are: the method for evaluating the ability of the drilling fluid to consolidate the well wall and break the surrounding rock provided by the present invention realizes the quantitative evaluation of the drilling fluid to improve the shear strength between the broken blocks, which is the stability of the well wall of the broken formation. Provides reliable mechanical parameters. At the same time, it also provides scientific and effective experimental methods for drilling fluid performance optimization and drilling fluid optimization, and provides strong support for the establishment of wellbore stabilization system technology in fractured formations, which is of great significance for safe and efficient drilling of deep oil and gas.
  • Figure 1 is a flow chart of the present invention
  • Figure 2 is a graph showing the results of uniaxial compression testing of a rock sample in an embodiment of the present invention
  • FIG. 3 is a schematic diagram of the test results of the shear strength under different normal loads in the embodiment of the present invention.
  • Figure 4 is a schematic diagram of the shear strength test results under different normal loads after the action of the drilling fluid in the embodiment of the present invention.
  • an evaluation method for the ability of drilling fluid to consolidate the wellbore and break surrounding rock includes the following steps:
  • the normal load includes 0MPa, And ⁇ nMax , where ⁇ nMax is the maximum normal load, and the shear strength of the contact surface of the disc specimen is calculated;
  • ⁇ fs is the shear strength of the contact surface of the disc specimen
  • ⁇ n is the applied normal stress
  • Is the friction angle of the contact surface of the disc sample.
  • the normal stress applied in the initial shear strength test is set to 0.1MPa, 0.20MPa and 0.40 respectively MPa.
  • the test results are shown in Figure 3, and it can be seen that the shear strength is 0.0840MPa, 0.1253MPa, and 0.2810MPa in sequence.
  • the internal friction angle can be calculated to be 34.5°.
  • the two disc samples are attached and fixed along the cutting surface, placed in a pressure-resistant closed container filled with drilling fluid, and pressure and temperature are applied to the closed container for a period of time; the applied pressure is equal to the formation
  • the pressure or drilling fluid pressure, and the temperature is the actual temperature of the formation. Keep the temperature and pressure constant, and the drilling fluid will act on the disc sample for 1 hour.
  • ⁇ df is the shear strength between the contact surfaces of the disc sample after the action of the drilling fluid
  • ⁇ n is the applied normal stress
  • C df is the cohesive force increase between the contact surfaces of the disc sample after the action of the drilling fluid.
  • C ⁇ is the increase in shear strength of the drilling fluid
  • ⁇ df is the shear strength between the contact surfaces of the disc sample after the action of the drilling fluid
  • ⁇ fs is the resistance of the contact surface of the disc sample.
  • Shear strength Is the increase of the friction angle of the drilling fluid, Is the friction angle between the contact surfaces of the disc sample after drilling fluid, Is the friction angle of the contact surface of the disc sample
  • the increase in shear strength C ⁇ is 52.3%, 36.2%, and 31.2% under the conditions of normal stress of 0.10MPa, 0.20MPa and 0.40MPa, respectively; the increase of friction angle under the action of cementation or consolidation of drilling fluid It was 14.2%.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
  • Earth Drilling (AREA)

Abstract

L'invention concerne un procédé d'évaluation de la capacité d'un fluide de forage à consolider une paroi de puits et à briser la roche environnante. Le procédé comprend : en fonction de la résistance au cisaillement de surfaces de contact d'échantillon, de la résistance au cisaillement entre les surfaces de contact d'échantillon après qu'un fluide de forage ait agi sur celles-ci, et d'un angle de frottement entre les surfaces de contact d'échantillon après que le fluide de forage ait agi sur celles-ci, calcul d'une augmentation d'amplitude dans la résistance au cisaillement provoquée par le fluide de forage et d'une augmentation d'amplitude de l'angle de frottement provoquée par le fluide de forage, et évaluation de la capacité du fluide de forage à consolider une paroi de puits et à briser la roche environnante en fonction d'une augmentation d'une force de cohésion entre les surfaces de contact d'échantillon après que le fluide de forage ait agi sur celles-ci et de l'augmentation d'amplitude dans la résistance au cisaillement provoquée par le fluide de forage et de l'augmentation d'amplitude dans l'angle de frottement provoqué par le fluide de forage. Le procédé d'évaluation de la capacité d'un fluide de forage à consolider une paroi de puits et à briser la roche environnante permet une évaluation quantitative de la capacité d'un fluide de forage à améliorer la résistance au cisaillement entre des blocs brisés, et fournit des paramètres mécaniques fiables pour la stabilité de parois de puits dans des strates fracturées.
PCT/CN2020/114848 2019-10-26 2020-09-11 Procédé d'évaluation de la capacité d'un fluide de forage à consolider une paroi de puits et à briser la roche environnante WO2021077938A1 (fr)

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CA3120909A CA3120909C (fr) 2019-10-26 2020-09-11 Procede d'evaluation de la capacite d'un fluide de forage a consolider une paroi de puits et a briser la roche environnante

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CN201911026896.X 2019-10-26
CN201911026896.XA CN110761779B (zh) 2019-10-26 2019-10-26 钻井液固结井壁破碎围岩能力的评价方法

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114839024A (zh) * 2022-07-04 2022-08-02 中国矿业大学(北京) 破碎岩体特性随钻测试与评价方法
US11733136B2 (en) 2021-12-10 2023-08-22 Saudi Arabian Oil Company Fluid sensitivity evaluation method for superior water-based mud design

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110761779B (zh) * 2019-10-26 2021-03-23 西南石油大学 钻井液固结井壁破碎围岩能力的评价方法
CN113255174B (zh) * 2021-07-15 2021-09-17 西南石油大学 考虑岩石动态强度和混合破碎模式的钻齿力学计算方法
CN115653567A (zh) * 2022-08-16 2023-01-31 吉林大学 一种井壁稳定效果评价实验装置及方法

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CN107014746A (zh) * 2017-03-30 2017-08-04 西南石油大学 一种破碎性地层钻井液加固井壁能力的评价方法
CN108254262A (zh) * 2016-12-28 2018-07-06 中国石油天然气股份有限公司 岩石层理裂缝剪切参数预测方法及装置
WO2018185095A1 (fr) * 2017-04-03 2018-10-11 Repsol, S.A. Procédé d'estimation de la région d'endommagement due à l'effondrement dans la paroi d'un trou de forage pendant l'opération de forage
CN109187228A (zh) * 2018-09-30 2019-01-11 西南石油大学 一种页岩地层钻井液稳定井壁能力的室内评价方法
CN109653736A (zh) * 2017-10-11 2019-04-19 中国石油化工股份有限公司 一种用于评价钻井液防塌性能的实验装置及方法
CN110761779A (zh) * 2019-10-26 2020-02-07 西南石油大学 钻井液固结井壁破碎围岩能力的评价方法

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CN108387685B (zh) * 2018-01-09 2019-03-29 中国石油大学(华东) 深水浅部弱胶结地层钻井液稳定井壁作用评价的方法和装置

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Publication number Priority date Publication date Assignee Title
US20150055438A1 (en) * 2013-08-24 2015-02-26 Schlumberger Technology Corporation Formation stability modeling
CN108254262A (zh) * 2016-12-28 2018-07-06 中国石油天然气股份有限公司 岩石层理裂缝剪切参数预测方法及装置
CN107014746A (zh) * 2017-03-30 2017-08-04 西南石油大学 一种破碎性地层钻井液加固井壁能力的评价方法
WO2018185095A1 (fr) * 2017-04-03 2018-10-11 Repsol, S.A. Procédé d'estimation de la région d'endommagement due à l'effondrement dans la paroi d'un trou de forage pendant l'opération de forage
CN109653736A (zh) * 2017-10-11 2019-04-19 中国石油化工股份有限公司 一种用于评价钻井液防塌性能的实验装置及方法
CN109187228A (zh) * 2018-09-30 2019-01-11 西南石油大学 一种页岩地层钻井液稳定井壁能力的室内评价方法
CN110761779A (zh) * 2019-10-26 2020-02-07 西南石油大学 钻井液固结井壁破碎围岩能力的评价方法

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11733136B2 (en) 2021-12-10 2023-08-22 Saudi Arabian Oil Company Fluid sensitivity evaluation method for superior water-based mud design
CN114839024A (zh) * 2022-07-04 2022-08-02 中国矿业大学(北京) 破碎岩体特性随钻测试与评价方法

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CN110761779B (zh) 2021-03-23
CA3120909A1 (fr) 2021-04-29
CA3120909C (fr) 2023-09-19
CN110761779A (zh) 2020-02-07

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