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High-temperature-resistant high-density solid-phase-free formate drilling fluid system

A high-density, solid-free technology, applied in the field of oil drilling, can solve problems such as the unsystematic development of solid-free drilling fluid systems, and achieve good reservoir protection performance, improved stability, and strong inhibitory effects

Active Publication Date: 2015-12-09
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0007] At present, there have been many domestic researches on the high-temperature and high-density drilling fluid system formed by traditional weighting materials, but the research on the solid-free drilling fluid system using organic salts as weighting materials has not been carried out systematically.

Method used

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Embodiment 1

[0022] Embodiment 1 prepares a kind of density 2.30g / cm by the prescription of table 1 3 High-temperature resistant high-density solid-phase formate-free drilling fluid system and its performance test.

[0023] Table 1

[0024]

[0025] 1. Indoor preparation procedure

[0026] (1) According to the formula determined above, weigh various treatment agents; each preparation amount is 4*350ml or 8*350ml;

[0027] (2) During preparation, mix potassium formate and cesium formate in a high-speed shear mixer at a speed of 1500rpm for 10 minutes, then increase the speed to 6000rpm, and slowly add viscosifiers and fluid loss additives at intervals of 5 minutes , Graphite, Potassium Carbonate, Potassium Bicarbonate, Magnesium Oxide, Seawater, and Calcium Carbonate are added within the last 3 minutes. The entire preparation process ensures that all components are added within 45 minutes and mixed uniformly to obtain the product;

[0028] (3) The temperature during mixing shall not e...

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Abstract

The invention discloses a high-temperature-resistant high-density solid-phase-free formate drilling fluid system. The drilling fluid system is prepared from the following compositions in percent by mass: 0.8-1.1% of a tackifier, 0.5-1.0% of a filtrate reducer, 1-2% of a first temporary blocking agent, 1.4-2.2% of a second temporary blocking agent, 0.4-0.9% of a buffering agent, 0.1-0.4% of an anti-oxidant, 45-87% of a weighting agent, and the balance seawater. The system density is 2.0-2.3 g / cm<3>. The drilling fluid system possesses the temperature resistance reaching to 200 DEG C and the density up to 2.3 g / cm<3>, and possesses relatively strong stability, inhibition property, lubricity, storage-layer protection property, degradability, no toxicity and harm to environment under the conditions of high temperature and high density.

Description

technical field [0001] The invention relates to a drilling fluid, in particular to a high-temperature-resistant high-density solid-phase-free drilling fluid system, which belongs to the technical field of petroleum drilling. Background technique [0002] As the world's demand for oil resources continues to increase and conventional easy-to-exploit oil resources are further developed, the exploration and development of oil resources is developing in high-temperature, high-pressure and other difficult areas. [0003] High-density drilling fluid can hold down the formation, maintain the stability of the well wall and prevent accidents such as overflow and blowout. Therefore, high-density drilling fluid is of great significance to the exploration and development of deep formation oil and gas reservoirs. [0004] High temperature will cause the drilling fluid to ferment, thicken and lose efficacy, which will lead to drastic changes in the performance of the drilling fluid, and it...

Claims

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Application Information

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IPC IPC(8): C09K8/12
CPCC09K8/12C09K2208/34
Inventor 谢玉洪董星亮李中黄熠李炎军张超吴江杨仲涵陈浩东王巍张可王泽峰谢露
Owner CHINA NAT OFFSHORE OIL CORP
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