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Oil-based stuck freeing fluid for well drilling

An oil-based anti-jamming and drilling technology, which is applied in the field of oil-based anti-jamming liquid, can solve the problems of long soaking time and low jamming efficiency, and achieve the effects of short soaking time, convenient material procurement, and low comprehensive cost of jamming

Active Publication Date: 2009-09-16
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the above technical problems, the present invention proposes an oil-based jam release fluid suitable for drilling. The invention overcomes the defects of long immersion time and low jam release efficiency of traditional and foreign conventional oil-based jam release fluids. , and can quickly and effectively relieve the pressure difference adhesion stuck pipe accident occurred during drilling

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The invention discloses an oil-based jam-free fluid for well drilling, which is prepared by mixing the following components in weight percent: 4% of organic soil, 1% of main emulsifier, 0.5% of auxiliary emulsifier, 4% of anti-corrosion Card agent, 5% quicklime, 25% fast penetrating agent, and the rest is diesel. After adopting such a technical scheme, it has the characteristics of strong penetration ability, fast dehydration speed of mud cake and remarkable lubricating performance when dealing with differential pressure sticking. It has the advantages of simple construction technology and relatively low overall cost of card removal. Successfully achieved the time to quickly and effectively relieve the differential pressure stuck pipe accident.

Embodiment 2

[0024] As a preferred embodiment of the present invention, the present invention comprises the following components by weight: 5% organic soil, 1.5% primary emulsifier, 1% secondary emulsifier, 5% anti-seize agent , 6% quicklime, 30% fast penetrating agent, and the rest is diesel.

[0025] During the drilling process, if pressure differential sticking occurs, it can be prepared directly at the drilling site, ready to use, especially after KT is added, it can be pumped into the wellbore within one hour.

[0026] Since a larger amount of fast penetrating agent is added in this solution, the soaking time of the prepared oil-based anti-jam solution is shorter, usually only 30 minutes, which overcomes the limitations of traditional and foreign conventional oil-based anti-jam solutions. The defect of long immersion time and high efficiency of jam release can more quickly and effectively relieve the pressure difference adhesion sticking accident that occurs during drilling.

Embodiment 4

[0030] As the best implementation mode of the present invention, on the basis of Examples 1, 2 and 3, an appropriate amount of barite is also added in the oil-based anti-jamming solution, and the amount of barite is mainly to meet the requirements of different densities. The range can safely use the anti-jamming liquid, usually by adding 5%-300% barite relative to the weight percentage of the anti-jamming liquid to adjust the density of the anti-jamming liquid. The diesel oil is commercially available common 0# diesel oil, which itself has a certain destructive effect on the mud cake of water-based drilling fluid, and it can also dissolve oil-soluble solid phase substances and pasty substances. The organoclay is a commercially available industrial grade 928 type, which is mainly for the adjustment of rheology and also for the stability of the system. The main emulsifier is commercially available industrial-grade SP-80 (chemical name Sphen 80), which intensifies the emulsificat...

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PUM

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Abstract

The invention discloses an oil-based stuck freeing fluid for well drilling, characterized by consisting of the following mixed ingredients based on weight percent: 4%-5% of organic soil, 1%-1.5% of primary emulsion, 0.5%-1% of secondary emulsion, 4%-5% of an anti-stuck agent, 5%-6% of quicklime and the balances of diesel oil and a quick penetrant. The invention overcomes the defects of long immersion time and inferior stuck freeing efficiency in the conventional and foreign normal oil-based stuck freeing fluids at present, and can rapidly and efficiently settle the accident of adhesion differential pressure sticking that happens in drilling.

Description

technical field [0001] The invention relates to the technical field of petroleum drilling, in particular to an oil-based jam-releasing fluid for drilling. Background technique [0002] With the continuous expansion of the exploration field, the number of special craft wells such as ultra-deep wells, highly deviated wells, and horizontal wells has increased sharply. The drilling and production are restricted by various factors, resulting in the objective existence of high pressure differences in the same open hole section. Accidents of stuck drills occur frequently. [0003] During drilling, once the sticking occurs due to differential pressure, the common way to release the sticking is to soak the oil-based sticking release agent. However, the domestic traditional and imported oil-based sticking release agents usually take more than several hours to release the sticking effect after entering the well. Some do not even play the role of unblocking, the soaking time is long an...

Claims

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Application Information

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IPC IPC(8): C09K8/34
Inventor 张坤李家龙李朝川黄平郑建昆张远彬董耘李建辉秦宗伦
Owner BC P INC CHINA NAT PETROLEUM CORP
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