Polyamine drilling fluid

A technology of polyamine drilling and polyamine, applied in the direction of drilling composition, chemical instruments and methods, etc., can solve the problems of downhole complexity, instability of wellbore wall, and insufficient suppression ability of high water-sensitive formations

Active Publication Date: 2012-03-28
CHINA PETROCHEMICAL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these inhibitors are not capable of inhibiting high-slurry and high-water-sensitivity formations. In Xinjiang and western Sichuan, the wellbore stability problem is still a bottleneck problem that plagues the exploration and development of deep wells in these areas. It leads to downhole complexity and further induces accidents in the well

Method used

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  • Polyamine drilling fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] In accordance with the China Petroleum and Natural Gas Industry Standard Evaluation SY / T6335-1997, the sample expansion test was carried out. So the instrument is NP-3 shale expansion tester.

[0028] Weigh 8.00g of secondary bentonite (0.15-0.044mm in diameter) dried at 105°C±3°C for 4h, and make a tablet on a press (pressure 10MPa, time 5min). Put the tablet into the shale dilatometer, add a certain amount of water, and measure the expansion rate of the mud shale tablet after soaking in the test solution.

Embodiment 2

[0030] Weigh 0.6g polyamine sample, add water to 100g, and make a polyamine solution with a mass concentration of 0.6%.

[0031] Wherein the polyamine structure is,

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

[0033] In accordance with the China Petroleum and Natural Gas Industry Standard Evaluation SY / T6335-1997, the sample expansion test was carried out. So the instrument is NP-3 shale expansion tester.

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

Embodiment 3

[0036] Weigh 0.6g polyamine sample, add water to 100g, and make a polyamine solution with a mass concentration of 0.6%.

[0037] Wherein the polyamine structure is,

[0038] R 1 , R 2 is an ethyl group, m+n is 18.

[0039] In accordance with the China Petroleum and Natural Gas Industry Standard Evaluation SY / T6335-1997, the sample expansion test was carried out. So the instrument is NP-3 shale expansion tester.

[0040] Weigh 8.00g of secondary bentonite (0.15-0.044mm in diameter) dried at 105°C±3°C for 4h, and make a tablet on a press (pressure 10MPa, time 5min). Put the compressed tablet into a shale dilatometer, add a certain mass percentage of polyamine inhibitor solution, and measure the expansion rate of the mud shale compressed tablet after soaking in the test solution.

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Abstract

The invention belongs to the field of petrochemical drilling technology, and relates to polyamines drilling fluid used in the petroleum drilling process. The polyamines drilling fluid mainly contains 0.1-5% of shale inhibitor, 0.1-5% of fluid loss additive, 0.1-5% of coating agent, 0.1-5% of lubricating agent, 0-5% of thickening agent, 0-5% of plugging agent, 1-10% of slurry compounding soil, and pH regulator and weighting agent which are blended and added according to the need; and the polyamines drilling fluid also contains the balance of water used for preparing the drilling fluid. The polyamines drilling fluid has stronger capability of inhibiting hydrous expansion and hydrous disintegration of bentonite, has good rheological property and high-temperature resistance, and is applicable to oil reservoir and oil gas drilling engineering with high water sensitivity and higher clay content.

Description

technical field [0001] The invention belongs to the technical field of petrochemical drilling, and provides a polyamine drilling fluid used for drilling engineering in high-slurry, high-water-sensitive formations and unstable formations. 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 in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/22C09K8/24
Inventor 袁俊秀黄冬朱魁王康逯贵广徐冬梅杨智中金钢
Owner CHINA PETROCHEMICAL CORP
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