Method for regulating well drilling liquid granularity distribution

A particle size distribution and drilling fluid technology, applied in drilling composition, chemical instruments and methods, earthwork drilling and production, etc., can solve the problems that affect the plugging effect and do not consider the impact, so as to increase the production of single well and reduce the filtration rate. The effect of loss and good reservoir

Inactive Publication Date: 2015-04-15
CHINA PETROCHEMICAL CORP +1
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  • Application Information

AI Technical Summary

Problems solved by technology

It only considers the matching of the blocking agent particles and formation pore throats, and does not consider the impact of the particle size distribution of the drilling fluid on site on the filling process, which will inevitably affect the selection of the particle size and mixing ratio of the blocking agent particles. Influence, affecting the final blocking effect

Method used

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  • Method for regulating well drilling liquid granularity distribution
  • Method for regulating well drilling liquid granularity distribution
  • Method for regulating well drilling liquid granularity distribution

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Secondly, using the particle size distribution data of the drilling fluid and the plugging and shielding agent, the following mathematical model is used to draw the square root coordinate diagram of cumulative volume % to particle size,

[0026]

[0027] In the formula, y is the particle fraction content smaller than the particle size d; d is any particle size, unit μm; n is the model parameter; d L is the maximum particle size in the particle system, unit μm; d S is the smallest particle size in the particle system, in μm;

[0028] Third, according to the maximum pore throat diameter D of the reservoir 90 , (100%, (D 90 ) 1 / 2 ) and the origin as the oil conservation baseline;

[0029] Fourth, change the particle size or / and ratio of the drilling fluid or / and the blocking and shielding agent so that the cumulative volume % of the drilling fluid and different blocking and shielding agents to the square root of the particle size curve is closer to the oil conservat...

Embodiment 2

[0032] Example 3:

Embodiment 3

[0034] The particle size distribution data of drilling fluid and plugging and shielding agent were measured by laser particle size analyzer.

[0035] Example 4:

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PUM

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Abstract

The invention belongs to the technical field of reservoir stratum protection in petroleum and gas, and geologic prospecting well drilling, and particularly relates to a method for regulating well drilling liquid granularity distribution. The method for regulating the well drilling liquid granularity distribution includes: analyzing granularity distribution curves of well drilling liquid and blocking and shielding agents according to the maximum pore throat diameter D90 of a target reservoir stratum, and screening out particle diameter proportions of the well drilling liquid and the blocking and shielding agents. The method for regulating the well drilling liquid granularity distribution has the advantages of enabling filling of the well drilling liquid to conform to an ideal filling rule by analyzing well drilling liquid granularity on the scene and supplementing the blocking and shielding agents different in grain diameter proportion, and achieving the effects of reducing filtration loss of the well drilling liquid and reducing invasion of filter liquid. According to the method for regulating the well drilling liquid granularity distribution, a curve of a relationship between accumulative volumes (%) and grain diameter square roots is drawn by considering data of the well drilling liquid granularity distribution, and then a result finally obtained is true and reliable, conforms to actual situations on the scene, and therefore the reservoir stratum can be protected well, and an output of a single well is improved.

Description

technical field [0001] The invention belongs to the technical field of reservoir protection in petroleum and natural gas and geological exploration drilling, in particular to a method for adjusting the particle size distribution of drilling fluid. Background technique [0002] Rational design of drilling fluid is one of the key technologies to achieve harmless well completion, and optimizing the particle size of the plugging and shielding agent (also called temporary plugging agent) used in the drilling fluid to match the pore throat of the formation is another key technology. key to this technology. Shielding temporary blocking technology has been widely promoted and applied in China, and achieved good results. However, this technology selects the particle size of the temporary plugging agent according to the average pore throat diameter of the reservoir, so it is difficult to effectively plug the large pore throats that contribute greatly to the permeability of oil and ga...

Claims

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Application Information

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IPC IPC(8): E21B33/13C09K8/42
CPCE21B33/13C09K8/426
Inventor 李斌乔军何兴贵李公让刘宝锋张敬辉李海斌武学芹于雷张虹王莉萍
Owner CHINA PETROCHEMICAL CORP
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