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Preparation method of synthetic base drilling fluid

An oil-based drilling fluid and synthetic-based technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of easy collapse, poor inhibition ability, shale hydration expansion, etc. Good rheological properties, low aromatic content

Inactive Publication Date: 2013-04-03
CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

my country's shale gas reservoirs are rich in resources. Judging from the current pilot test wells in the Sichuan Basin, the main feature of shale is that it is easy to collapse. The synthetic base drilling fluid represented by the above-mentioned patent documents has poor inhibition ability and is easy to cause shale gas. Due to the hydration expansion of rocks, synthetic base drilling fluids cannot effectively solve the problem of borehole collapse during the drilling of shale gas exploration wells and development wells

Method used

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  • Preparation method of synthetic base drilling fluid
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  • Preparation method of synthetic base drilling fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] As a preferred application example of the present invention, the main application in the shale gas development of the Changning block in Sichuan is a synthetic base drilling fluid formed from a synthetic base as the main raw material. The formulation of the drilling fluid of the present invention is:

[0036] 70% synthetic base + 3.0% organic soil + 3.0% main emulsifier + 3.0% auxiliary emulsifier + 0.1% wetting agent + 0.9% flow regulator + 2.0% CaO + 10% CaCl 2 Aqueous solution + 5.0% fluid loss agent + 3.0% anti-collapse plugging agent; (among which CaCl 2 The mass concentration of the aqueous solution is 20%).

[0037] The steps to apply this formula to a specific preparation method are as follows:

[0038] a. Under stirring conditions, add organic soil, main emulsifier, auxiliary emulsifier, wetting agent, flow modifier, and quicklime into the synthetic base fluid according to the formula, and stir for 30 minutes;

[0039] b. The preparation mass concentration is 20% CaCl 2...

Embodiment 2

[0044] As another preferred application example of the present invention, the main application in the Fushun and Jinqiu blocks of the Sichuan Shell project is a synthetic base drilling fluid formed from a synthetic base as the main raw material. The formulation of the drilling fluid of the present invention is:

[0045] 65% synthetic base+4.0% organic soil+4.0% primary emulsifier+3.0% secondary emulsifier+0.1% wetting agent+0.9% flow regulator+2.0%CaO+12%CaCl 2 Aqueous solution + 6.0% fluid loss agent + 3.0% anti-collapse plugging agent; (among which CaCl 2 The mass concentration of the aqueous solution is 20%).

[0046] The steps to apply this formula to a specific preparation method are as follows:

[0047] a. Under stirring conditions, add organic soil, main emulsifier, auxiliary emulsifier, wetting agent, flow modifier, and quicklime into the synthetic base fluid according to the formula, and stir for 30 minutes;

[0048] b. The preparation mass concentration is 20% CaCl 2 Solution...

Embodiment 3

[0053] As the best embodiment of the present invention, the present invention discloses a method for preparing synthetic-based drilling fluid, which includes the following steps:

[0054] a. Under stirring conditions, by weight percentage, wetting 2.0%~4.0% of organic soil, 3.0%~5.0% of main emulsifier, 2.0%~4.0% of auxiliary emulsifier, 0.1%~0.2% of wetting Adding agent, 0.5%~2.0% flow regulator, 2.0%~3.0% CaO to 60~70% synthetic base, stirring for 30min;

[0055] b. The preparation mass concentration is 20% CaCl 2 Solution to make CaCl 2 completely dissolved;

[0056] c. Under stirring conditions, reduce the weight percentage of 10% to 15% CaCl 2 The solution is slowly added to the synthetic base;

[0057] d. Add 4.0% to 6.0% by weight fluid loss agent and 2.0% to 3.0% anti-collapse plugging agent to the synthetic base under stirring conditions;

[0058] e. Add barite to the synthetic base to achieve the required density and form synthetic base drilling fluid.

[0059] The said anti-...

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Abstract

The invention discloses a preparation method of a synthetic base drilling fluid. The preparation method comprises the steps of a. adding 2.0%-4.0% of organic soil, 3.0%-5.0% of main emulsifier, 2.0%-4.0% of auxiliary emulsifier, 0.1%-0.2% of wetting agent, 0.5%-2.0% of flow pattern conditioning agent and 2.0%-3.0% of CaO to 60-70% of synthetic base in percent by weight under a stirring condition, and stirring for 30min; b. preparing a CaCl2 solution with the mass concentration of 20%, and enabling CaCl2 to completely dissolve; c. slowly adding 10%-15% of CaCl2 aqueous solution in percent by weight to the synthetic base under a stirring condition; and d. adding 4.0%-6.0% of filtrate-loss reducer and 2.0%-3.0% of anti-sloughing blocking agent in percent by weight to the synthetic base under a stirring condition to form the synthetic base drilling fluid. The preparation method is simple in processing steps and easy in operation. The synthetic base drilling fluid prepared by the method has the characteristics of strong anti-sloughing inhibition capability, good salt and calcium erosion resistance performance and obvious lubrication performance.

Description

[0001] technical field [0002] The invention is used in the drilling engineering of deep wells, ultra-deep wells, special wells, complex wells and shale gas wells, and belongs to the technical field of petroleum and natural gas synthesis base drilling fluid development. Background technique [0003] With the continuous expansion of exploration fields, the number of deep wells, ultra-deep wells, special wells and complex wells continues to increase. Whether at home or abroad, oil exploration and development are gradually developing in deep formations and offshore. The formation conditions encountered are becoming increasingly complex and the drilling depth is increasing. In recent years, with the increase in the number of horizontal wells, process wells, and underbalanced wells, drilling has become more and more difficult. Especially in highly water-sensitive formations, drilling with water-based drilling fluids may easily lead to well wall collapse. Therefore, the existing ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/32
Inventor 王睿陈俊斌欧阳伟王兰贺海高强王娟
Owner CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD
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