Site treatment technique for environment-friendly polyether alcohol amine drilling fluid

A polyether alcohol amine, on-site treatment technology, applied in earthwork drilling, wellbore flushing, wellbore/well parts, etc., can solve problems such as repeated fluctuations in rheological properties, large consumption of drilling fluid materials, and impact on environmental performance. Achieve the effect of smooth water supply of drilling fluid pump, weak foaming phenomenon and heavy workload

Active Publication Date: 2016-11-16
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, due to the phenomenon of viscosity increase in the field application of polyalcohol drilling fluid, the rheological properties fluctuate repeatedly, the consumption of drilling fluid materials is large, and in high-temperature deep well operations, in order to improve the temperature resistance of the drilling fluid on site, non-environmental protection and high temperature resistance treatment are often used Agent-assisted construction affects its environmental protection performance

Method used

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  • Site treatment technique for environment-friendly polyether alcohol amine drilling fluid
  • Site treatment technique for environment-friendly polyether alcohol amine drilling fluid

Examples

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Comparison scheme
Effect test

Embodiment 1

[0017] Take the field construction of a certain H-XX well in Jiangsu Oilfield as an example to further illustrate the field construction method of the present invention.

[0018] Well H-XX was completed with a drilling depth of 5050m, predicted formation temperature at the bottom of the well was 142°C, three open hole sections were opened at 3150m, the maximum well deviation was 57°, and the horizontal displacement was 831.31m. The drilling fluid system of ordinary soil slurry + composite metal ion polymer is used in the first section of 0-495m well depth, and the composite metal ion polymer drilling fluid system is used in the second section of 495-1900m well depth. In case of collapsible mudstone and sand-mudstone interbedded.

[0019] 1. Drilling fluid requirements for the third open-hole well section: implement technical measures for drilling fluid in the block, and take the collapse prevention of the whole well section and ensure the wellbore regulation as the focus of dr...

Embodiment 2

[0036] The present invention is further illustrated by taking the field construction of a certain Z-XX well in Jiangsu Oilfield as an example.

[0037] Well Z-XX has been drilled to a depth of 5605m, the predicted formation temperature at the bottom of the well is 149°C, the maximum well deviation is 62°, and the horizontal displacement is 1203.5m. Drilling with clean water in the 0-196m well depth of the first well opening section, ordinary soil slurry + composite metal ion polymer drilling fluid system in the 196-1802m well drilling section of the second well opening section, and composite metal ion polymer drilling fluid system in the 1802-2967m well opening section of the third well opening section , the 2967-5605m well depth of the fourth well section adopts the environment-friendly polyether alcohol amine drilling fluid system.

[0038] 1. Mixing and conversion of drilling fluid: Drill the cement plug four times, drain the contaminated drilling fluid, dilute with clean w...

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Abstract

The invention relates to a site treatment technique for environment-friendly polyether alcohol amine drilling fluid and belongs to the field of exploitation of oil and gas fields. The site treatment technique for the environment-friendly polyether alcohol amine drilling fluid comprises the stage of mixing and converting, the stage of performance maintenance and the stage of well completion preparation. According to the stage of mixing and converting, drilling is conducted to a deep shale well section, the content of bentonite in original well slurry is reduced to be 20-30 g/l, formate and a tackifier are added into the well slurry till the mass content of the formate reaches 3% and the mass content of the tackifier reaches 0.2%, 400-500 kg of polyether polyols is supplemented into the drilling fluid each circulation cycle to guarantee that the mass content of the polyether polyols in the drilling fluid is 1.5%-2.0%, a capsulating agent, a polyamine inhibitor, a filtrate reducer and an anti-collapse agent are then sequentially added till the mass content of the capsulating agent in the drilling fluid reaches 0.2%-0.3%, the mass content of the polyamine inhibitor in the drilling fluid reaches 0.2%, the mass content of the filtrate reducer in the drilling fluid reaches 2% and the mass content of the anti-collapse agent in the drilling fluid reaches 1.5%, and are full circulated, the PH value of the mixture is regulated to 8-9 with caustic soda after system conversion is completed, and then the drilling fluid is thickened to the required density. The site treatment technique can be applied to drilling processes in different strata to achieve effective lubricating, prevent drilling tools from getting stuck and stabilize well walls.

Description

technical field [0001] The invention relates to the technical field of oil and gas field exploitation, in particular to an on-site treatment process of an environment-friendly polyether alcohol amine drilling fluid. Background technique [0002] With the continuous expansion of the exploration field, exploration is gradually developing in the direction of "low, deep and hidden". The formation conditions encountered are becoming more and more complex, and the well temperature is getting higher and higher. At the same time, the development of drilling fluid technology is restricted by environmental protection laws, regulations and policies. Under such circumstances, it is imperative to apply a drilling fluid system that meets the needs of drilling engineering safety and environmental protection. [0003] At present, widely used water-based drilling fluid systems, such as composite metal ion drilling fluid system, polysulfonate drilling fluid system, KCl / polymer drilling fluid ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B21/06
CPCE21B21/062
Inventor 宋碧涛杨雪山王媛媛睢文云陈军薛芸
Owner CHINA PETROLEUM & CHEM CORP
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