CN110761779A - Method for evaluating surrounding rock crushing capability of drilling fluid consolidation well wall - Google Patents
Method for evaluating surrounding rock crushing capability of drilling fluid consolidation well wall Download PDFInfo
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- 238000005553 drilling Methods 0.000 title claims abstract description 134
- 239000012530 fluid Substances 0.000 title claims abstract description 113
- 239000011435 rock Substances 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000007596 consolidation process Methods 0.000 title abstract description 15
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 10
- 238000002474 experimental method Methods 0.000 claims abstract description 5
- 238000010008 shearing Methods 0.000 claims description 13
- 238000012360 testing method Methods 0.000 claims description 10
- 238000012669 compression test Methods 0.000 claims description 4
- 238000003825 pressing Methods 0.000 claims description 3
- 238000011156 evaluation Methods 0.000 abstract description 8
- 238000005516 engineering process Methods 0.000 abstract description 3
- 238000011158 quantitative evaluation Methods 0.000 abstract description 2
- 230000000087 stabilizing effect Effects 0.000 abstract description 2
- 238000011161 development Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000005764 inhibitory process Effects 0.000 description 2
- 208000010392 Bone Fractures Diseases 0.000 description 1
- 206010017076 Fracture Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
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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
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Abstract
The invention discloses an evaluation method for the surrounding rock crushing capability of a drilling fluid consolidation well wall. The method for evaluating the surrounding rock breaking capacity of the drilling fluid consolidation well wall provided by the invention realizes quantitative evaluation of the drilling fluid for improving the shear strength among the broken blocks, and provides reliable mechanical parameters for the well wall stability of the broken stratum. Meanwhile, a scientific and effective experimental method is provided for optimizing the performance of the drilling fluid and optimizing the drilling fluid, a powerful support is provided for the establishment of a fractured formation well wall stabilizing system technology, and the method has important significance for safe and efficient drilling of deep oil and gas.
Description
Technical Field
The invention relates to the technical field of oil and gas drilling, in particular to an evaluation method for the capacity of a drilling fluid for solidifying a well wall to crush surrounding rocks.
Background
Along with the continuous increase of the exploration and development depth of oil gas, well wall instability problems such as broken strata, broken strata falling, collapse, leakage and the like of oil gas drilling frequently become important problems commonly faced by deep oil gas drilling. On the basis of improving the inhibition and blocking performance of the drilling fluid, the method is the most effective technical means for reducing the consolidation capability of the drilling fluid on broken surrounding rock of the well wall to the maximum extent and avoiding the unstable collapse of the well wall of a broken stratum. Therefore, the scientific and reasonable evaluation of the drilling fluid on the capabilities of crushing confining pressure cementing and consolidation is not only an important basis for optimizing the performance of the drilling fluid, but also an important basis for designing safe drilling engineering, especially drilling fluid, and has important significance on the establishment of a rapid and safe drilling technology for complex crushed strata.
The cementing and consolidation capabilities of the drilling fluid on broken rock of a well wall are closely related to the lithology of a stratum, namely the cementing or consolidation capabilities of the same drilling fluid system are different aiming at the lithology of different lithology strata; and meanwhile, the drilling fluid is influenced by the ambient temperature and pressure, namely the drilling fluid shows different consolidation capacities under the conditions of different formation temperatures and pressures in the same lithologic formation and the same drilling fluid system. Because the drilling fluid has a plurality of influencing factors on the cementing or consolidation capability of broken rocks of a well wall and is limited by the difficulty in drilling and coring in broken stratums, the performance evaluation of the drilling fluid mainly aims at a complete stratum and a part of fracture development stratums for a long time, and the performance evaluation of the drilling fluid on the stable well wall mainly focuses on the inhibition performance, the plugging performance, the rheological performance and the wall-building performance of the drilling fluid. And the evaluation on the cementing or consolidation capability of the drilling fluid is less, and a systematic indoor evaluation method is not available so far.
Disclosure of Invention
Aiming at the defects in the prior art, the method for evaluating the wall breaking capacity of the drilling fluid consolidation well wall provided by the invention solves the problem that the performance evaluation result of the drilling fluid stabilization well wall is inaccurate.
In order to achieve the purpose of the invention, the invention adopts the technical scheme that: a method for evaluating the surrounding rock breaking capacity of a drilling fluid consolidation well wall comprises the following steps:
s1, obtaining fresh and complete underground drilling coring which is the same as the lithology of the broken stratum, drilling a cylindrical sample, and uniformly splitting the cylindrical sample into two disc samples along the central line;
s2, drilling a standard plunger sample through drilling coring, performing uniaxial compression test on the standard plunger sample by using a rock mechanics experiment machine, and calculating to obtain uniaxial compressive strength UCS of the rock;
s3, butting the two disc samples along the slicing surfaces, testing the shear strength under the action of normal load along the contact surfaces, and calculating to obtain the shear strength of the contact surfaces of the disc samples;
1/20 for maximum normal load no higher than the uniaxial compressive strength UCS;
s4, jointing, fitting and fixing the two disc samples along the splitting surfaces, placing the disc samples into a pressure-resistant closed container filled with drilling fluid, and applying pressure and temperature to the closed container for a period of time;
s5, taking the two disc samples out of the closed container, placing the two disc samples in a direct shear box, carrying out a shear strength test under the action of normal load along a contact surface, and measuring the shear strength between the contact surfaces of the disc samples after the action of the drilling fluid;
s6, calculating a friction angle between the contact surfaces of the disc samples after the action of the drilling fluid and a cohesive force increment between the contact surfaces of the disc samples after the action of the drilling fluid according to the shear strength between the contact surfaces of the disc samples after the action of the drilling fluid;
s7, calculating the increase range of the shearing strength of the drilling fluid and the increase range of the friction angle of the drilling fluid by the aid of the shearing strength of the contact surfaces of the disc samples, the shearing strength of the contact surfaces of the disc samples after the drilling fluid acts and the friction angle of the contact surfaces of the disc samples after the drilling fluid acts, and evaluating the capacity of the drilling fluid for solidifying the broken surrounding rock of the well wall according to the increase of the cohesive force between the contact surfaces of the disc samples after the drilling fluid acts, the increase range of the shearing strength of the drilling fluid and the increase range of the friction angle of the drilling fluid.
Further: the diameter of the cylindrical sample in the step S1 is 50mm, and the length is 50 mm.
Further: the standard plunger sample in the step S2 has a diameter of 25mm and a length of 50 mm.
Further: the normal load in the steps S3 and S5 comprises 0MPa,
And σnMaxWhere σ isnMaxIs the maximum normal load.
Further: the calculation formula of the shear strength of the contact surface of the disc sample in the step S3 is as follows:
in the above formula, τfsShear strength, σ, of contact surface of disc specimennIn order for the normal stress to be applied,
the friction angle of the contact surface of the disc sample.
Further: in the step S4, the applied pressure is equal to the formation pressure or the drilling fluid pressure, and the applied temperature is equal to the actual formation temperature.
Further: the calculation formula of the friction angle between the contact surfaces of the disc samples after the drilling fluid acts in the step S6 is as follows:
in the above formula, τdfShear strength, sigma, between contact surfaces of disc samples after action of drilling fluidnIn order for the normal stress to be applied,
angle of friction between contact surfaces of disc samples after application of drilling fluid, CdfThe cohesive force between the contact surfaces of the disc samples is increased after the drilling fluid acts.
Further: the calculation formula of the increase of the drilling fluid to the shear strength and the increase of the drilling fluid to the friction angle in the step S7 is as follows:
in the above formula, CτFor the drilling fluid to increase the magnitude of the shear strength, τdfFor the shear strength, tau, between the contact surfaces of the disc samples after the action of the drilling fluidfsThe shear strength of the contact surface of the disc specimen,
for the magnitude of the increase in the drilling fluid to friction angle,
the friction angle between the contact surfaces of the disc samples after the drilling fluid acts,
the friction angle of the contact surface of the disc sample.
The invention has the beneficial effects that: the method for evaluating the surrounding rock breaking capacity of the drilling fluid consolidation well wall provided by the invention realizes quantitative evaluation of the drilling fluid for improving the shear strength among the broken blocks, and provides reliable mechanical parameters for the well wall stability of the broken stratum. Meanwhile, a scientific and effective experimental method is provided for optimizing the performance of the drilling fluid and optimizing the drilling fluid, a powerful support is provided for the establishment of a fractured formation well wall stabilizing system technology, and the method has important significance for safe and efficient drilling of deep oil and gas.
Drawings
FIG. 1 is a flow chart of the present invention;
FIG. 2 is a graph illustrating uniaxial compression test results for a rock sample according to an embodiment of the present invention;
FIG. 3 is a schematic diagram illustrating a shear strength test result under different normal loads in an embodiment of the present invention;
FIG. 4 is a schematic diagram of a shear strength test result under different normal loads after the drilling fluid acts in the embodiment of the invention.
Detailed Description
The following description of the embodiments of the present invention is provided to facilitate the understanding of the present invention by those skilled in the art, but it should be understood that the present invention is not limited to the scope of the embodiments, and it will be apparent to those skilled in the art that various changes may be made without departing from the spirit and scope of the invention as defined and defined in the appended claims, and all matters produced by the invention using the inventive concept are protected.
As shown in FIG. 1, the method for evaluating the surrounding rock crushing capacity of the well wall consolidated by the drilling fluid comprises the following steps:
s1, obtaining fresh and complete underground drilling coring identical to the lithology of a fractured stratum, drilling a cylindrical sample, uniformly cutting the cylindrical sample into two disc samples with the diameter of 50mm and the length of 20-25 mm along a central line, and marking the two disc cutting surfaces with A, B respectively; and the length and the diameter of the disc sample are tested, the apparent structure observation is carried out, and the development characteristics of structural planes such as bedding, cracks and the like are described.
S2, drilling a standard plunger sample through well drilling and coring, wherein the diameter of the standard plunger sample is 25mm, the length of the standard plunger sample is 50mm, performing uniaxial compression test on the standard plunger sample by using a rock mechanics experiment machine, and calculating to obtain the uniaxial compression strength UCS of the rock; as shown in FIG. 2, it can be seen from the experimental results that the uniaxial compressive strength UCS was 62.7 MPa.
S3, butting the two disc samples along the slicing surfaces, and carrying out a shear strength test under the action of normal load along the contact surfaces, wherein the normal load comprises a load of 0MPa,And σnMaxWhere σ isnMaxThe maximum normal load is obtained, and the shear strength of the contact surface of the disc sample is obtained through calculation;
the calculation formula of the shear strength of the contact surface of the disc sample is as follows:
in the above formula, τfsShear strength, σ, of contact surface of disc specimennIn order for the normal stress to be applied,
the friction angle of the contact surface of the disc sample.
The normal stresses applied by the initial shear strength test were set to 0.1MPa, 0.20MPa, and 0.40MPa, respectively, on the principle that the maximum normal load was not higher than 1/20 for the uniaxial compressive strength UCS and was as low as possible. As shown in FIG. 3, the shear strengths were 0.0840MPa, 0.1253MPa, and 0.2810MPa, respectively. From the test results, the internal friction angle (shear strength) was calculated to be 34.5 °.
S4, jointing, fitting and fixing the two disc samples along the splitting surfaces, placing the disc samples into a pressure-resistant closed container filled with drilling fluid, and applying pressure and temperature to the closed container for a period of time; the applied pressure is equal to the formation pressure or drilling fluid pressure and the temperature is the actual temperature of the formation. And keeping the temperature and the pressure constant, and allowing the drilling fluid to act on the disc sample for 1 hour.
S5, taking out the two disc samples from the closed container, placing the disc samples in a direct shear box, carrying out shear strength tests under the normal load action of 0.10MPa, 0.20MPa and 0.40MPa along the contact surfaces, and measuring the shear strength between the contact surfaces of the disc samples after the drilling fluid action, wherein the shear strength is 0.1280MPa, 0.1693MPa and 0.3676MPa respectively, and the shear strength results under the normal stress action are shown in figure 4.
S6, calculating a friction angle between the contact surfaces of the disc samples after the action of the drilling fluid and a cohesive force increment between the contact surfaces of the disc samples after the action of the drilling fluid according to the shear strength between the contact surfaces of the disc samples after the action of the drilling fluid;
the calculation formula of the friction angle between the contact surfaces of the disc samples after the drilling fluid acts is as follows:
in the above formula, τdfShear strength, sigma, between contact surfaces of disc samples after action of drilling fluidnIn order for the normal stress to be applied,
angle of friction between contact surfaces of disc samples after application of drilling fluid, CdfThe cohesive force between the contact surfaces of the disc samples is increased after the drilling fluid acts.
The friction angle between the contact surfaces of the disc samples is 39.57 degrees through calculation, and the cohesion increment between the contact surfaces of the disc samples after the drilling fluid acts is 0.0283 MPa.
S7, calculating the increase range of the shearing strength of the drilling fluid and the increase range of the friction angle of the drilling fluid by the aid of the shearing strength of the contact surfaces of the disc samples, the shearing strength of the contact surfaces of the disc samples after the drilling fluid acts and the friction angle of the contact surfaces of the disc samples after the drilling fluid acts, and evaluating the capacity of the drilling fluid for solidifying the broken surrounding rock of the well wall according to the increase of the cohesive force between the contact surfaces of the disc samples after the drilling fluid acts, the increase range of the shearing strength of the drilling fluid and the increase range of the friction angle of the drilling fluid.
The calculation formula of the increase amplitude of the drilling fluid to the shearing strength and the increase amplitude of the drilling fluid to the friction angle is as follows:
in the above formula, CτFor the drilling fluid to increase the magnitude of the shear strength, τdfFor the shear strength, tau, between the contact surfaces of the disc samples after the action of the drilling fluidfsThe shear strength of the contact surface of the disc specimen,
for the magnitude of the increase in the drilling fluid to friction angle,the friction angle between the contact surfaces of the disc samples after the drilling fluid acts,
angle of friction for contact surface of disc specimen
Increase in shear Strength Cτ52.3 percent, 36.2 percent and 31.2 percent under the conditions of normal stress of 0.10MPa, 0.20MPa and 0.40MPa respectively; drilling fluidIncrease of friction angle under cementation or consolidation
The content was 14.2%.
Claims (8)
1. The method for evaluating the capacity of the drilling fluid for solidifying the borehole wall to crush the surrounding rock is characterized by comprising the following steps of:
s1, obtaining fresh and complete underground drilling coring which is the same as the lithology of the broken stratum, drilling a cylindrical sample, and uniformly splitting the cylindrical sample into two disc samples along the central line;
s2, drilling a standard plunger sample through drilling coring, performing uniaxial compression test on the standard plunger sample by using a rock mechanics experiment machine, and calculating to obtain uniaxial compressive strength UCS of the rock;
s3, butting the two disc samples along the slicing surfaces, testing the shear strength under the action of normal load along the contact surfaces, and calculating to obtain the shear strength of the contact surfaces of the disc samples;
1/20 for maximum normal load no higher than the uniaxial compressive strength UCS;
s4, jointing, fitting and fixing the two disc samples along the splitting surfaces, placing the disc samples into a pressure-resistant closed container filled with drilling fluid, and applying pressure and temperature to the closed container for a period of time;
s5, taking the two disc samples out of the closed container, placing the two disc samples in a direct shear box, carrying out a shear strength test under the action of normal load along a contact surface, and measuring the shear strength between the contact surfaces of the disc samples after the action of the drilling fluid;
s6, calculating a friction angle between the contact surfaces of the disc samples after the action of the drilling fluid and a cohesive force increment between the contact surfaces of the disc samples after the action of the drilling fluid according to the shear strength between the contact surfaces of the disc samples after the action of the drilling fluid;
s7, calculating the increase range of the shearing strength of the drilling fluid and the increase range of the friction angle of the drilling fluid by the aid of the shearing strength of the contact surfaces of the disc samples, the shearing strength of the contact surfaces of the disc samples after the drilling fluid acts and the friction angle of the contact surfaces of the disc samples after the drilling fluid acts, and evaluating the capacity of the drilling fluid for solidifying the broken surrounding rock of the well wall according to the increase of the cohesive force between the contact surfaces of the disc samples after the drilling fluid acts, the increase range of the shearing strength of the drilling fluid and the increase range of the friction angle of the drilling fluid.
2. The method for evaluating the capacity of the drilling fluid for consolidating the wall and breaking the surrounding rock as claimed in claim 1, wherein the diameter of the cylindrical sample in the step S1 is 50mm, and the length of the cylindrical sample is 50 mm.
3. The method for evaluating the capacity of the drilling fluid for consolidating the wall of the well to crush the surrounding rock as claimed in claim 1, wherein the diameter of the standard plunger sample in the step S2 is 25mm, and the length of the standard plunger sample is 50 mm.
4. The method for evaluating the capacity of the drilling fluid for breaking the surrounding rock of the consolidated well wall of the claim 1, wherein the normal loads in the steps S3 and S5 both comprise 0MPa,
And σnMaxWhere σ isnMaxIs the maximum normal load.
5. The method for evaluating the ability of the drilling fluid to consolidate the borehole wall and break the surrounding rock according to claim 1, wherein the calculation formula of the shear strength of the contact surface of the disc sample in the step S3 is as follows:
in the above formula, τfsShear strength, σ, of contact surface of disc specimennIn order for the normal stress to be applied,
the friction angle of the contact surface of the disc sample.
6. The method as claimed in claim 1, wherein the pressure applied in step S4 is equal to the formation pressure or the drilling fluid pressure, and the applied temperature is the actual temperature of the formation.
7. The method for evaluating the ability of the drilling fluid to solidify the well wall and break the surrounding rock according to claim 1, wherein the calculation formula of the friction angle between the contact surfaces of the disc samples after the drilling fluid acts in the step S6 is as follows:
in the above formula, τdfShear strength, sigma, between contact surfaces of disc samples after action of drilling fluidnIn order for the normal stress to be applied,angle of friction between contact surfaces of disc samples after application of drilling fluid, CdfThe cohesive force between the contact surfaces of the disc samples is increased after the drilling fluid acts.
8. The method for evaluating the ability of the drilling fluid to solidify the well wall and crush the surrounding rock according to claim 1, wherein the calculation formula of the increase of the drilling fluid to the shear strength and the increase of the drilling fluid to the friction angle in the step S7 is as follows:
in the above formula, CτFor the drilling fluid to increase the magnitude of the shear strength, τdfFor the shear strength, tau, between the contact surfaces of the disc samples after the action of the drilling fluidfsFor disc sample connectionThe shear strength of the contact surface is high,
for the magnitude of the increase in the drilling fluid to friction angle,
the friction angle between the contact surfaces of the disc samples after the drilling fluid acts,the friction angle of the contact surface of the disc sample.
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| CN201911026896.XA CN110761779B (en) | 2019-10-26 | 2019-10-26 | Method for evaluating surrounding rock crushing capability of drilling fluid consolidation well wall |
| PCT/CN2020/114848 WO2021077938A1 (en) | 2019-10-26 | 2020-09-11 | Method of evaluating capability of drilling fluid to consolidate well wall and break surrounding rock |
| CA3120909A CA3120909C (en) | 2019-10-26 | 2020-09-11 | Method of evaluating capability of drilling fluid to consolidate well wall and break surrounding rock |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021077938A1 (en) * | 2019-10-26 | 2021-04-29 | 西南石油大学 | Method of evaluating capability of drilling fluid to consolidate well wall and break surrounding rock |
| CN113255174A (en) * | 2021-07-15 | 2021-08-13 | 西南石油大学 | Drilling tooth mechanics calculation method considering rock dynamic strength and mixed crushing mode |
| CN115653567A (en) * | 2022-08-16 | 2023-01-31 | 吉林大学 | Experimental device and method for evaluating well wall stability effect |
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| US11733136B2 (en) | 2021-12-10 | 2023-08-22 | Saudi Arabian Oil Company | Fluid sensitivity evaluation method for superior water-based mud design |
| CN114839024B (en) * | 2022-07-04 | 2022-09-20 | 中国矿业大学(北京) | Method for testing and evaluating characteristics of fractured rock mass while drilling |
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| CN108387685A (en) * | 2018-01-09 | 2018-08-10 | 中国石油大学(华东) | The method and apparatus of the weak consolidated formation drilling fluid stabilizing borehole evaluation of effect of deep water superficial part |
| WO2018185095A1 (en) * | 2017-04-03 | 2018-10-11 | Repsol, S.A. | Method of estimating the region of damage due to collapse in the wall of a borehole during the drilling operation |
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| US9835746B2 (en) * | 2013-08-24 | 2017-12-05 | Schlumberger Technology Corporation | Formation stability modeling |
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| CN107014746A (en) * | 2017-03-30 | 2017-08-04 | 西南石油大学 | A kind of evaluation method of broken formation drilling fluid Reinforcing Shaft ability |
| CN110761779B (en) * | 2019-10-26 | 2021-03-23 | 西南石油大学 | Method for evaluating surrounding rock crushing capability of drilling fluid consolidation well wall |
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2019
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| WO2018185095A1 (en) * | 2017-04-03 | 2018-10-11 | Repsol, S.A. | Method of estimating the region of damage due to collapse in the wall of a borehole during the drilling operation |
| CN109653736A (en) * | 2017-10-11 | 2019-04-19 | 中国石油化工股份有限公司 | A kind of experimental provision and method for appraisal drilling liquid caving-preventing characteristic |
| CN108387685A (en) * | 2018-01-09 | 2018-08-10 | 中国石油大学(华东) | The method and apparatus of the weak consolidated formation drilling fluid stabilizing borehole evaluation of effect of deep water superficial part |
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| WO2021077938A1 (en) * | 2019-10-26 | 2021-04-29 | 西南石油大学 | Method of evaluating capability of drilling fluid to consolidate well wall and break surrounding rock |
| CN113255174A (en) * | 2021-07-15 | 2021-08-13 | 西南石油大学 | Drilling tooth mechanics calculation method considering rock dynamic strength and mixed crushing mode |
| CN115653567A (en) * | 2022-08-16 | 2023-01-31 | 吉林大学 | Experimental device and method for evaluating well wall stability effect |
Also Published As
| Publication number | Publication date |
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| WO2021077938A1 (en) | 2021-04-29 |
| CA3120909A1 (en) | 2021-04-29 |
| CN110761779B (en) | 2021-03-23 |
| CA3120909C (en) | 2023-09-19 |
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