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Strongly inhibitory solid-free polyamine-formate drilling fluid system

A formate, strong inhibition technology, applied in the field of petrochemical drilling, can solve the problems of insufficient research on polyamine solid-free drilling fluids

Active Publication Date: 2012-04-25
CHINA PETROCHEMICAL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At present, the domestic research on new polyamine drilling fluid system has just started, and the research on new polyamine solid-free drilling fluid is even less

Method used

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  • Strongly inhibitory solid-free polyamine-formate drilling fluid system

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The swellability test of the sample was carried out in accordance with the evaluation of SY / T6335-1997 of the Chinese oil and gas industry standard. So the instrument is the NP-3 shale expansion tester.

[0029] Weigh 8.00g of secondary bentonite (diameter 0.15-0.044mm) dried at 105°C ± 3°C for 4 hours, and make a compressed tablet (pressure 10MPa, time 5min) on a press. Put the compressed tablets into the shale dilatometer, add a certain amount of water, and measure the expansion rate of the shale compressed tablets after soaking in the test solution.

Embodiment 2

[0031] Weigh 1.5g polyamine sample, add water to 100g, make a polyamine solution with a mass concentration of 1.5%, where the polyamine structure is,

[0032] R 1 , R 2 Is an ethyl group, and m+n is 2.

[0033] The swellability test of the sample was carried out in accordance with the evaluation of SY / T6335-1997 of the Chinese oil and gas industry standard. So the instrument is the NP-3 shale expansion tester.

[0034] Weigh 8.00g of secondary bentonite (diameter 0.15-0.044mm) dried at 105°C ± 3°C for 4 hours, and make a compressed tablet (pressure 10MPa, time 5min) on a press. Put the tablet into the shale dilatometer, add a certain mass percentage of polyamine inhibitor solution, and measure the expansion rate of the shale tablet after soaking in the test solution.

Embodiment 3

[0036] Weigh 2.5g polyamine sample, add water to 100g, make a polyamine solution with a mass concentration of 2.5%, where the polyamine structure is,

[0037] R 1 , R 2 Is an ethyl group, and m+n is 2.

[0038] The swellability test of the sample was carried out in accordance with the evaluation of SY / T6335-1997 of the Chinese oil and gas industry standard. So the instrument is the NP-3 shale expansion tester.

[0039] Weigh 8.00g of secondary bentonite (diameter 0.15-0.044mm) dried at 105°C ± 3°C for 4 hours, and make a compressed tablet (pressure 10MPa, time 5min) on a press. Put the tablet into the shale dilatometer, add a certain mass percentage of polyamine inhibitor solution, and measure the expansion rate of the shale tablet after soaking in the test solution.

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Abstract

The invention belongs to the technical field of petrochemical industry well drilling and relates to a strongly inhibitory solid-free polyamine-formate drilling fluid system. The polyamine-formate drilling fluid system contains strongly inhibitory polyamine shale inhibitor and usually comprises necessary finishing agents like filtrate reducer, polymer coating agent, tackifier and lubricant, etc. The system contains no solid phase, and uses formate as a weighting agent. The polyamine-formate drilling fluid system comprises 0.1-5% of shale inhibitor, 0.1-5% of filtrate reducer, 0.1-5% of coatingagent, 0.1-5% of tackifier, 0.1-5% of lubricant, weighting agent formate added according to actual requirement during well drilling and the balance of water for preparing the drilling fluid. And routine drilling fluid finishing agents like plugging agent and pH conditioning agent can be added according to on-site conditions on the well drilling spot. The drilling fluid system of the invention hasstrong inhibition effect on water-sensitive mud shale; besides, as the drilling fluid system contains no solid-phase particles like clay and barite, damage on a hydrocarbon reservoir is reduced substantially.

Description

technical field [0001] The invention belongs to the technical field of petrochemical drilling, and relates to a strong inhibitory solid-free polyamine-formate drilling fluid system used in the petroleum drilling process. Background technique [0002] Shale inhibitors play a very important role in the drilling of oil and gas wells, especially in the drilling of oil wells in high-slurry, high-water-sensitive formations and unstable formations. Due to the serious problem of shale hydration (surface adsorption and osmotic adsorption), leading to There are a series of problems such as shale spalling, wellbore expansion, formation of sand bridges or inability to run to the bottom, stuck pipe, and difficulty in wellbore cleaning. [0003] Domestic traditional shale inhibitors mainly include KCl, sulfonated pitch, potassium humate and various quaternary ammonium salts. In recent years, some new inhibitors have appeared, such as: cationic inhibitors, zwitterionic inhibitors, MMH pos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/12
Inventor 袁俊秀逯贵广徐冬梅王康黄冬杨智中朱魁金钢
Owner CHINA PETROCHEMICAL CORP
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