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Borehole cleaning liquid and preparation method thereof

A technology for cleaning liquids and boreholes, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve problems such as narrow application range, and achieve the effect of high-efficiency suspension

Active Publication Date: 2014-07-02
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the composition of the drilling and completion fluid described in this patent is relatively simple, and the scope of application is narrow, and it is mainly used for reservoir protection of fractured oil and gas reservoirs

Method used

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  • Borehole cleaning liquid and preparation method thereof
  • Borehole cleaning liquid and preparation method thereof
  • Borehole cleaning liquid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] First, add bentonite to water, configure bentonite base slurry with a bentonite content of 3%, and cure for 24 hours. Then add 0.3% polyacrylamide dry powder and 0.5% carboxymethylcellulose sodium salt (low viscosity) in sequence, and stir at high speed for 20 minutes. Finally, add 0.1% ultra-short fibers with a length of 2 mm and a diameter of 5 μm, and stir at high speed for 20 minutes. The rheological properties and API filtration loss were measured at room temperature, and the experimental results are shown in Table 1.

[0027] Table 1

[0028]

Embodiment 2

[0030] First, add 0.15-0.3% sodium carbonate to water, then add bentonite, prepare bentonite base slurry with 6% bentonite content, and cure for 24 hours. Then add 0.5% potassium polyacryloylate, 2% carboxymethyl sulfonated phenolic resin SMP-2 and 2% hydrolyzed polyacrylonitrile ammonium salt in sequence, stir at high speed for 8 minutes step by step during the addition process, and then add 50% recrystallized stone. Finally, add 3% ultra-short fibers with a length of 20 mm and a diameter of 50 μm, and stir at high speed for 10 min. The rheological properties and API filtration loss were measured at room temperature, and the experimental results are shown in Table 2.

[0031] Table 2

[0032]

Embodiment 3

[0034] First, a bentonite base slurry with a mass fraction of 4% was prepared and cured for 30 hours. Then add 0.3% polyacrylamide dry powder and 2% carboxymethylsulfonated phenolic resin SMP-2 in sequence, and stir at high speed for 20 minutes. Finally, add 0.2% ultra-short fibers with a length of 5 mm and a diameter of 10 μm, and stir at high speed for 20 minutes. The rheological properties and API fluid loss were measured at room temperature, and the experimental results are shown in Table 3.

[0035] table 3

[0036]

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Abstract

The invention relates to a borehole cleaning liquid for a petroleum exploration drilling well and a preparation method thereof. The borehole cleaning liquid is composed of bentonite base mud, at least one polymer treating agent performing a flocculation function, at least one filtrate loss reducer performing a filtrate loss reducing function, an ultra-short fiber, a weighting agent and water, wherein bentonite in the bentonite base mud accounts for 3 to 6% of the amount of water, the polymer treating agent performing the flocculation function accounts for 0.3 to 0.5% of the massic volume fraction of the base mud, the loss reducer performing the filtrate loss reducing function accounts for 0.5 to 4% of the massic volume fraction of the base mud, the ultra-short fiber accounts for 0.1 to 3% of the massic volume fraction of the base mud, and the amount of the weighting agent depends on needs. The borehole cleaning liquid can effectively suspend and carry rock debris and remove rock debris beds in the drilling process of horizontal wells and large-displacement wells.

Description

technical field [0001] The invention relates to the field of drilling fluid for exploration drilling, in particular to a wellbore cleaning fluid and a preparation method for suspending and carrying cuttings and removing cuttings beds in horizontal wells and extended-reach wells. Background technique [0002] With the deepening of oil and gas exploration and development, horizontal well / extended reach well drilling technology is more and more widely used in the development process of beach oilfields, offshore oilfields and oil and gas reservoirs with extremely complex ground conditions. Due to the long horizontal section, it is difficult to carry cuttings, and it is easy to form a cuttings bed, which leads to complex situations downhole. Therefore, the problem of borehole purification is a prominent problem in the application of horizontal well / extended reach well technology. In the construction of horizontal wells / extended reach wells at home and abroad, the commonly used dr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/14C09K8/03
CPCC09K8/206C09K8/24C09K2208/08
Inventor 于雷乔军张敬辉李公让赵怀珍曹胜利
Owner CHINA PETROLEUM & CHEM CORP
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