Nanometer drilling fluid

A drilling fluid and nanoemulsion technology, applied in the field of oil drilling engineering, can solve problems such as affecting the efficiency and quality of oil drilling, unable to effectively block formation pores, unable to effectively maintain wellbore stability, etc., to achieve excellent reservoir protection performance, reduce The effect of exfoliative exfoliation, blocking surface hydration and osmotic hydration

Inactive Publication Date: 2009-09-23
XI'AN PETROLEUM UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to solve these problems, people have applied a variety of mud shale anti-slump drilling fluids in recent years. However, because the particle size of conventional anti-slump drilling fluids does not match the formation pore size, they cannot effectively seal the formation pores, and rapidly Form a layer of isolation film to prevent the drilling fluid filtrate from invading the formation near the well wall and prevent pressure transmission, which cannot effectively maintain the stability of the well wall and seriously affect the efficiency and quality of oil drilling

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] To apply nano drilling fluid of the present invention in T306 well, need 190m 3 Nano-drilling fluid with a water content of 900kg / m 3 , bentonite content is 40kg / m 3 , nanoemulsion JDL-3 is 25kg / m 3 , the MMH of the positive charge is 2kg / m 3 , polymer PAM is 3kg / m 3 , sulfonated asphalt FT-1 is 10kg / m 3 , sulfonated phenolic resin SMP is 15kg / m 3 , anti-salt and anti-temperature loss agent LS-1 is 15kg / m 3 , flow regulator DS-2 is 10kg / m 3 And sodium hydroxide NaOH is 8kg / m 3 , circulate through the mud pump during the drilling process.

[0013] Implementation results: T306 was drilled to a depth of 4,332 meters. The whole well went smoothly during the drilling process. No shale wall collapse occurred. The electrical survey was successful once, and the completion operation went smoothly. The average diameter expansion rate of the shale section was 6.3%.

Embodiment 2

[0015] Applying the nano-drilling fluid of the present invention in the L981 well requires 200m 3 Nano-drilling fluid with a water content of 900kg / m 3 , bentonite content is 44kg / m 3 , nanoemulsion JDL-3 is 26.5kg / m 3 , the positive gel MMH is 2.4kg / m 3 , polymer PAM is 3.5kg / m 3 , sulfonated asphalt FT-1 is 12kg / m 3 , sulfonated phenolic resin SMP is 16kg / m 3 , anti-salt and anti-temperature loss agent LS-1 is 16kg / m 3 , flow regulator DS-2 is 12kg / m 3 And sodium hydroxide NaOH is 8.5kg / m 3 , circulate through the mud pump during the drilling process.

[0016] Implementation results: L981 was drilled to a depth of 4,340 meters. The whole well was drilled smoothly without shale collapse. The electric survey was successful once, and the completion operation was smooth. The average diameter expansion rate of the shale section was 5.9%.

Embodiment 3

[0018] Applying the nano-drilling fluid of the present invention in the L985 well requires 210m 3 Nano-drilling fluid with a water content of 900kg / m 3 , bentonite content is 48kg / m 3 , nanoemulsion JDL-3 is 28kg / m 3 , the positive charge MMH is 2.8kg / m 3 , polymer PAM is 4kg / m 3 , sulfonated asphalt FT-1 is 13.5kg / m 3 , sulfonated phenolic resin SMP is 18kg / m 3 , anti-salt and anti-temperature loss agent LS-1 is 18kg / m 3 , flow regulator DS-2 is 13.5kg / m 3 And sodium hydroxide NaOH is 9.5kg / m 3 , circulate through the mud pump during the drilling process.

[0019] Implementation results: L985 was drilled to a depth of 4,290 meters. The whole well was drilled smoothly without shale collapse. The electrical survey was successful once, and the completion operation was smooth. The average diameter expansion rate of the shale section was 6.9%.

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Abstract

The invention relates to nanometer drilling fluid. The concentration of the nanometer drilling fluid comprises 900kg / m<3> of water, 40-50kg / m<3> of bentonite, 25-30kg / m<3> of nanometer emulsion JDL-3, 2-3kg / m<3> of cationic gel MMH, 3-5kg / m<3> of high molecular polymer PAM, 10-15kg / m<3> of sulfonated gilsonite FT-1, 15-20kg / m<3> of sulfonated phenolic resin SMP, 15-20kg / m<3> of salt and temperature resistant fluid loss agent LS-1, 10-15kg / m<3> of flow type regulating agent DS-2 and 8-10kg / m<3> of sodium hydroxide (NaOH). The nanometer drilling fluid has good colloid dispersivity and high heat stability, improves the rheology of the drilling fluid, increases the compactness of mud cakes, improves the thickness of the mud cakes, quickly forms a layer of nanometer film on a well wall, prevents the drilling fluid from invading stratums near the well wall and pressure from being transmitted and has good anti-caving performance and good storage layer protection performance.

Description

technical field [0001] The invention relates to petroleum drilling engineering, in particular to a nano-drilling fluid suitable for preventing collapse of well walls in strong water-sensitive mud shale formations. Background technique [0002] Wellbore instability in strong water-sensitive shale is a world-class problem encountered in the drilling process. Due to strong water-sensitive shale formations, complex accidents such as tripping resistance, large-section reaming and pipe sticking often occur during drilling. , Electrical logging, sidewall coring, and nuclear magnetic resonance operations encountered obstructions during drilling operations, and even oil and gas wells were scrapped. In order to solve these problems, people have applied a variety of mud shale anti-slump drilling fluids in recent years. However, because the particle size of conventional anti-slump drilling fluids does not match the formation pore size, they cannot effectively seal the formation pores, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/24
Inventor 屈展沈建文王俊奇王佩平
Owner XI'AN PETROLEUM UNIVERSITY
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