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Water-based drilling fluid for low-temperature formation drilling

A drilling fluid and water-based technology, which is applied in the field of water-based drilling fluid and low-temperature formation drilling water-based drilling fluid, can solve the problems of comprehensive performance such as wellbore stability and hydrate inhibitory filtration performance, etc., and achieve good The effects of wellbore stability, good hydrate inhibition, and good fluid loss wall building

Inactive Publication Date: 2016-04-20
中石化石油工程技术服务有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the drilling fluid only evaluates and optimizes the rheological properties, without considering comprehensive properties such as wellbore stability, hydrate inhibition, and fluid loss performance.

Method used

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  • Water-based drilling fluid for low-temperature formation drilling
  • Water-based drilling fluid for low-temperature formation drilling

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1: preparation of seawater-based deep-water drilling fluid system, including the following components by weight:

[0023] 3kg of sodium-based bentonite is used for slurry preparation; 3kg of polyethylene glycol and 5kg of KCl are used for shale inhibitor; 0.2kg of xanthan gum and 0.5kg of viscoelastic surfactant cetyltrimethylammonium chloride are used as flow regulator The coating inhibitor uses cationic polyacrylamide 0.1kg; the fluid loss reducer uses polyanionic cellulose and starch, among which: polyanionic cellulose 0.5kg; starch 2.5kg; the lubricant uses vegetable oil ester lubricant SD-505: 1kg; hydrate inhibitor using NaCl: 10kg; seawater is recorded as 100kg.

Embodiment 2

[0025] Prepare the clay-free seawater-based deepwater drilling fluid system, including the following components by weight percentage:

[0026] Sodium bentonite 0kg is used for slurry preparation; shale inhibitor is polyethylene glycol 3kg; coating inhibitor is partially hydrolyzed polyacrylamide 0.2kg; flow regulator is xanthan gum 0.4kg; Anionic cellulose 0.5kg; starch 1.5kg; sulfonated phenolic resin 4kg; hydrate inhibitor using NaCl: 20kg; mineral oil 2kg; barite 20kg; seawater is recorded as 100kg.

Embodiment 3

[0027] Embodiment 3: preparation of seawater-based deep-water drilling fluid system, including the following components by weight:

[0028] Calcium-based bentonite 4kg is used for slurry preparation; polyethylene glycol 0.3kg and potassium chloride 0.7kg are used as shale inhibitor; xanthan gum 2kg and viscoelastic surfactant cetyl trimethyl chloride are used as flow regulator Ammonium chloride 3kg; cationic polyacrylamide 0.5kg used as coating inhibitor; polyanionic cellulose and starch used as fluid loss control agent, among which: polyanionic cellulose 3kg; starch 7kg; lubricant used vegetable oil ester lubricant SD-505 : 1kg; hydrate inhibitor using NaCl: 40kg; seawater is recorded as 100kg.

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Abstract

The invention relates to a water-based drilling fluid for low-temperature formation drilling. The technical solution of the invention is that the water-based drilling fluid is prepared with the following components in parts by weight: 100 parts of water, 0 to 4 parts of mixing soil, 0.1 to 5 parts of flow pattern regulator, 1 to 8 parts of shale inhibitor, 0.05 to 0.5 parts of encapsulating and inhibiting agent, 3 to 10 parts of filtrate reducer, 10 to 40 parts of hydrate inhibitor, 1 to 2 parts of lubricant and 0 to 100 parts of barite. The water-based drilling fluid has the following advantages: (1) the drilling fluid disclosed by the invention has good fluidity under the low temperature of negative 5DEG C, the plastic viscosity is less than or equal to 40mPa.s, and the yield point is less than or equal to 25Pa; (2) the drilling fluid disclosed by the invention has good borehole wall stability and filtration and wall-building properties, the swelling rate of clay can be deceased by about 70 to 90 percent, and the highest shale recovery ratio reaches 88.2 percent (21.1 percent for clean water); the API filtration loss is less than or equal to 5mL; (3) the drilling fluid disclosed by the invention has good hydrate inhibition property, and no hydrate is produced after the drilling fluid is mixed for 16 hours under the conditions of negative 5DEG C and 15MPa; (4) the lubricating coefficient of the drilling fluid disclosed by the invention is less than 0.1, which can meet the requirement of drilling operation.

Description

technical field [0001] The invention relates to a drilling fluid for oil and natural gas development, in particular to a water-based drilling fluid for drilling in low-temperature formations, which is applied to deep-water oceans and low-temperature formations in permafrost zones. Background technique [0002] Marine deep-water oil, gas and gas hydrate resources are rich and have great potential; tundra zones also contain rich gas hydrate resources. Compared with land or shallow sea drilling, drilling in deep ocean and permafrost ultra-low temperature formations faces many special technical problems, and the drilling fluid must have the following characteristics: (1) Good low temperature rheology. With the increase of water depth, the seawater temperature is getting lower and lower, and the lowest seabed temperature in the Gulf of Mexico, the South my country Sea and West African waters is 2~4°C. The low temperature causes the viscosity and shear force of the drilling fluid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/24
CPCC09K8/24C09K2208/12C09K2208/22C09K2208/34
Inventor 陈二丁邱正松赵欣郭保雨邱维清张海青王明亮严波钟汉毅柴金鹏
Owner 中石化石油工程技术服务有限公司
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