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Low-viscosity high-shear high-density oil-base drilling fluid

An oil-based drilling fluid, high-density technology, applied in the field of drilling, can solve the problems of easy high temperature thickening failure, high plastic viscosity, low shear force, etc., to achieve easy rheological properties, good temperature resistance, easy operation and maintenance. Effect

Inactive Publication Date: 2016-07-06
CNPC SICHUAN GASOLINEEUM GEOPHYSICAL PROSPECTING ENG TECH RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the problems of low shear force, high plastic viscosity and easy high-temperature thickening failure existing in the existing high-density oil-based drilling fluid

Method used

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  • Low-viscosity high-shear high-density oil-base drilling fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Measure 320mL of white oil in a 500mL high stirring cup, add 12.0g of emulsifier G326 and 8.0g of calcium hydroxide (accurate to 0.0lg) while stirring with a high-speed stirrer, and slowly add 80mL of CaCl after stirring for 10 minutes 2 Brine, 12.0g fluid loss reducer G328, 2.0g viscosifier G336-VIS and 6.0g shearing agent G322-MOD, total high-speed stirring for 90min, interrupt once every 20min to scrape off the slurry adhering to the cup wall, and finally add Barite to achieve the required drilling fluid density.

[0026] Test 1: The rheological performance test of the oil-based drilling fluid of embodiment 1 under different densities

[0027] According to the above steps, the density is 1.6g / cm3 3 , 1.8g / cm 3 , 2.0g / cm 3 and 2.2g / cm 3 After hot rolling at 150°C for 16 hours, perform the following performance tests according to the regulations in "GB / T16783.2-2012 Oil and Gas Industry Drilling Fluid Field Test Part 2 Oil-based Drilling Fluid", the results are sho...

Embodiment 2

[0048] Measure 340mL of white oil into a 500mL high stirring cup, add 12.0g of emulsifier G326 and 8.0g of calcium hydroxide (accurate to 0.0lg) while stirring with a high-speed stirrer, and slowly add 60mL of CaCl after stirring for 10 minutes 2 Brine, 8.0g fluid loss reducer G328, 2.0g viscosifier G336-VIS, and 8.0g shear lifter G322-MOD were stirred at a high speed for 90 minutes, interrupted every 20 minutes to scrape off the slurry adhering to the cup wall. That is, the oil-based drilling fluid of the present invention is obtained.

[0049] Test 5: Comparative test of the rheological properties of the drilling fluid at different ratios (mass ratio of viscosifier to shear raising agent) of Example 2.

[0050] The oil-based drilling fluid formula is as follows: the mass percentage ratio of base oil to calcium chloride brine is 80:20, 3.0% emulsifier, 2.0% calcium hydroxide, and 2.0% fluid loss reducer based on the total weight of oil-based drilling fluid , Cutting agent, t...

Embodiment 3

[0053] Measure 360mL of base oil into a 500mL high stirring cup, add 9.0g of emulsifier G326 and 12.0g of calcium hydroxide (accurate to 0.0lg) while stirring with a high-speed stirrer, slowly add 40mL of CaCl after stirring for 10min 2 Brine, 12.0g of fluid loss additive G328, 3.0g of viscosifier G336-VIS and 6.0g of shearing agent G322-MOD were stirred at high speed for 90 minutes in total, interrupted every 20 minutes to scrape off the slurry adhering to the cup wall. That is, the oil-based drilling fluid of the present invention is obtained.

[0054] Test 6: Comparative test of the rheological properties of oil-based drilling fluids formulated with different base oils in Example 3

[0055] The formula of embodiment 3 uses different base oils to prepare density 2.0g / cm respectively 3 After hot rolling at 150°C for 16 hours, perform the following performance tests according to the provisions in "GB / T16783.2-2012 Oil and Gas Industry Drilling Fluid Field Test Part 2 Oil-base...

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Abstract

The invention provides a low-viscosity high-shear high-density oil-base drilling fluid which is prepared from the following raw materials in percentage by weight: 30-80% of base oil, 10-30% of CaCl2 salt water, 3-6% of composite emulsifier G326-HEM, 2-5% of fluid loss additive G328, 1-5% of calcium hydroxide, 0.5-1% of tackifier G336-VIS, 1.5-5% of shear strength improving agent and the balance of barite. The low-viscosity high-shear high-density oil-base drilling fluid solves the problem of overhigh thickness of the high-density oil-base drilling fluid since the viscosity of the system greatly increases as the shear force of the high-density oil-base drilling fluid increases in the past, has the advantages of higher movable shear force, lower plastic viscosity and favorable rheological properties, and is suitable for requirements of the horizontal segment construction of the shale gas horizontal well for the solid-carrying behavior of the oil-base drilling fluid.

Description

technical field [0001] The invention belongs to the technical field of drilling, and in particular relates to a low-viscosity, high-shear high-density oil-based drilling fluid formula, which is mainly suitable for shale gas horizontal well construction. Background technique [0002] With the large-scale development of unconventional gas reservoirs marked by shale gas at home and abroad, the application of oil-based drilling fluids is becoming more and more extensive. Compared with traditional water-based drilling fluids, oil-based drilling fluids are widely used in shale gas drilling because of their good inhibitory, lubricating, and rheological properties. [0003] In order to obtain higher production in the process of shale gas exploration and development, the horizontal well mode is mostly used. In order to enhance anti-slump performance and well control requirements, high-density oil-based drilling fluid is usually used. Traditional oil-based drilling fluids generally ...

Claims

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Application Information

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IPC IPC(8): C09K8/32
CPCC09K8/32
Inventor 王京光杨斌张小平丁磊赵海锋寄晓宁王国庆凡帆
Owner CNPC SICHUAN GASOLINEEUM GEOPHYSICAL PROSPECTING ENG TECH RES INST
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