Water-based drilling fluid for stabilizing shale

A water-based drilling fluid and shale technology, applied in the field of water-based drilling fluid, can solve the problems of high cost and environmental pollution, and achieve the effects of low cost, high viscosity and shear force, and improved plugging capacity

Active Publication Date: 2014-04-16
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Oil-based drilling fluids are commonly used in shale drilling at home and abroad. Although they can better solve the problem of wellbore stability, there are problems such as high cost and environmental pollution.

Method used

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  • Water-based drilling fluid for stabilizing shale
  • Water-based drilling fluid for stabilizing shale

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] This Example 1 mainly reflects: (1) the preparation method and basic performance parameters (rheology and fluid loss) of water-based drilling fluid for stabilizing shale; (2) thermal stability evaluation of water-based drilling fluid for stabilizing shale ; (3) XRD analysis results of shale rock samples in Yanchang Oilfield; (4) Changes in expansion of shale rock samples in Yanchang Oilfield after contact with water-based drilling fluid for stable shale; (5) Shale rock samples in Yanchang Oilfield Rolling recovery rate results after contact with water-based drilling fluid for stable shale; (6) Changes of rheological parameters (apparent viscosity and plastic viscosity) of water-based drilling fluid for stable shale under high temperature and high pressure conditions; (7 ) Analysis of filtration performance of water-based drilling fluid for stable shale under high temperature and high pressure conditions; (8) Lubrication performance of water-based drilling fluid for stabl...

Embodiment 2

[0095] This example mainly reflects: (1) The preparation and basic performance parameters (rheology and fluid loss) of the water-based drilling fluid system for stable shale; (2) The water-based drilling fluid for stable shale was heated at 120°C for 16 hours The basic performance parameters in the future.

[0096] The water-based drilling fluid for stabilizing shale prepared in this example, the parts by mass of each component in the drilling fluid are: calculated by the addition amount per 100 milliliters of water, 5 grams of sodium bentonite, 1.5 grams of shale inhibitor gram, 0.5 gram of tackifier, 0.2 gram of flow regulator, 0.9 gram of fluid loss control agent, 2.5 grams of anti-high temperature treatment agent, 9.33 grams of bridging agent, 2.2 grams of plugging agent, and 1.3 grams of anti-slumping agent. Wherein: the shale inhibitor is sulfonated asphalt sodium salt. The thickener is polyanionic cellulose. The flow regulator is xanthan gum. The fluid loss control a...

Embodiment 3

[0110] The water-based drilling fluid for stabilizing shale prepared in this example, the parts by mass of each component in the drilling fluid are: calculated by the addition amount per 100 milliliters of water, 5 grams of sodium bentonite, 1.6 grams of shale inhibitor gram, 0.7 gram of tackifier, 0.1 gram of flow regulator, 0.7 gram of fluid loss reducer, 2.3 gram of anti-high temperature treatment agent, 10.67 gram of bridging agent, 1.8 gram of plugging agent, 1.1 gram of anti-slump agent. Wherein: the shale inhibitor is sulfonated asphalt sodium salt. The thickener is polyanionic cellulose. The flow regulator is xanthan gum. The fluid loss control agent is modified starch. The high temperature resistant treatment agent is lignite resin. The bridging agent is a nano-silica dispersion liquid with a mass concentration of 30%, and the particle diameter of the nano-silica particles in the dispersion liquid is 10-20 nm. The leak-stopping agent is nano-calcium carbonate, and...

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Abstract

The invention provides water-based drilling fluid for stabilizing shale. The drilling fluid is formed by mixing sodium-based bentonite, a shale inhibitor, a tackifier, a flow-pattern adjusting agent, a filtrate reducer, a high-temperature-resisting processing agent, a bridging agent, bridging particle and an anti-collapse agent. Calculated by the addition quantity in every 100 parts of water, the water-based drilling fluid comprises the following components in parts by mass: 5 parts of sodium-based bentonite, 1.5 to 1.8 parts of shale inhibitor, 0.5 to 0.7 part of tackifier, 0.1 to 0.2 part of flow-pattern adjusting agent, 0.7 to 0.9 part of filtrate reducer, 2.3 to 2.5 parts of high-temperature-resisting processing agent, 9.33 to 10.67 parts of bridging agent, 1.8 to 2.2 parts of bridging particle and 1.1 to 1.3 parts of anti-collapse agent. The drilling fluid is good in rheological property, filtrate reduction property and lubricating property and strong in inhabitation property, so that the requirement of the shale gas horizontal well drilling cuttings carrying and wall stability requirement can be met, and the probability of drilling seizure can be reduced.

Description

technical field [0001] The invention relates to a water-based drilling fluid, in particular to a drilling fluid capable of stabilizing shale, which is suitable for drilling horizontal wells of shale gas. Background technique [0002] During the drilling of shale gas horizontal wells, problems such as wellbore instability, high friction, and high torque are prone to occur, and "cuttings beds" are easily formed. Therefore, drilling fluids are required to have excellent rheology, low filtration, good lubricity, Requirements such as strong resistance and good plugging performance. [0003] Oil-based drilling fluid is commonly used in shale drilling at home and abroad. Although it can better solve the problem of wellbore stability, it has problems such as high cost and environmental pollution. Therefore, the research and development of water-based drilling fluids for shale gas horizontal wells deserves attention. In China, the mandatory water-based drilling fluid system is main...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/20C09K8/16C09K8/03
CPCC09K8/16C09K8/206C09K2208/12C09K2208/18C09K2208/28C09K2208/34
Inventor 蔡记华袁野常德武史亚运
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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