Oil-based drilling fluid for protecting shale gas reservoir

An oil-based drilling fluid and shale gas technology, applied in the field of oil drilling engineering, can solve the problems of filtrate entry, reservoir damage, and poor sealing performance, and achieve the effect of preventing damage and stabilizing the well wall

Inactive Publication Date: 2017-03-22
中石化石油工程技术服务有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, only 325-mesh calcium carbonate and 1250-mesh calcium carbonate powder are not very effective in sealing, and the filtrate will enter the reservoir, causing the reservoir to be destroyed

Method used

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  • Oil-based drilling fluid for protecting shale gas reservoir
  • Oil-based drilling fluid for protecting shale gas reservoir

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] An oil-based drilling fluid for protecting shale gas reservoirs includes 70 parts of 3# white oil and 30 parts of 26% calcium chloride aqueous solution in parts by volume; and

[0030] Based on the total volume of 3# white oil and 26% calcium chloride aqueous solution, by mass volume ratio (g / ml), also include 2.0% main emulsifier, 1.0% secondary emulsifier, 1.5% lime, 2.5% Organoclay, 2% viscosifier, 3.0% fluid loss control agent, 2.0% plugging agent, 2.0% reservoir protection agent, 30% weighting agent;

[0031] The reservoir protection agent is in parts by weight, and the particle size is 200 mesh calcium carbonate: 300 mesh magnesium oxide: 500 mesh magnesium carbonate: 800 mesh calcium carbonate: 1200 mesh magnesium carbonate: 2000 mesh magnesium oxide is 1:3:2.5: 5:5:2 compound mixture;

[0032] The main emulsifier is a compound mixture of long-chain alkyl fatty alcohol amide nonionic surfactant and modified benzene sulfonate at a ratio of 65:35 by volume;

[00...

Embodiment 2

[0042] An oil-based drilling fluid for protecting shale gas reservoirs, in parts by volume, comprising 90 parts of gas oil, 10 parts of 35% calcium chloride aqueous solution; and

[0043] Based on the total volume of gaseous oil and 35% calcium chloride aqueous solution, by mass volume ratio (g / ml), it also includes 1.0% main emulsifier, 0.5% secondary emulsifier, 1.0% lime, 1.0% organic Soil, 1.0% viscosifier, 1.0% fluid loss control agent, 1.0% plugging agent, 3.0% reservoir protection agent, 70% weighting agent;

[0044] According to the ratio of parts by weight, the reservoir protection agent has a particle size of 500 mesh calcium carbonate: 500 mesh magnesium oxide: 500 mesh magnesium carbonate: 800 mesh calcium carbonate: 800 mesh magnesium carbonate: 1000 mesh magnesium oxide: 1:1:1:5 :5:7 compound mixture;

[0045] The main emulsifier is a compound mixture of long-chain alkyl fatty alcohol amide nonionic surfactant and modified benzene sulfonate at a ratio of 50:50 b...

Embodiment 3

[0055] An oil-based drilling fluid for protecting shale gas reservoirs includes 80 parts of 0# diesel oil and 20 parts of 25% calcium chloride aqueous solution in parts by volume; and

[0056] Based on the total volume of 0# diesel oil and 25% calcium chloride aqueous solution, by mass volume ratio (g / ml), also include 3.0% main emulsifier, 1.5% auxiliary emulsifier, 3.0% lime, 3.0% Organic clay, 3.0% viscosifier, 5.0% fluid loss control agent, 3.0% plugging agent, 8.0% reservoir protection agent, 85% weighting agent;

[0057] According to the ratio of parts by weight, the reservoir protection agent has a particle size of 800 mesh calcium carbonate: 800 mesh magnesium oxide: 1000 mesh magnesium carbonate: 1000 mesh calcium carbonate: 1000 mesh magnesium carbonate: 1500 mesh magnesium oxide is 1:1:2:2 :2:4 compound mixture;

[0058] The main emulsifier is a compound mixture of long-chain alkyl fatty alcohol amide nonionic surfactant and modified benzene sulfonate at a ratio of...

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Abstract

The invention discloses an oil-based drilling fluid for protecting a shale gas reservoir, wherein the oil-based drilling fluid includes, in parts by volume, 70-90 parts of base oil and 10-30 parts of an aqueous phase; based on the total volume of the base oil and the aqueous phase, the oil-based drilling fluid further includes the components by the mass/volume ratio: 1-3% of a main emulsifier, 0.5-1.5% of an auxiliary emulsifier, 1-3% of lime, 1-3% of organic soil, 1-3% of a tackifier, 1-5% of a filtration loss reduction agent, 1-3% of a plugging agent, 3-8% of a reservoir protective agent, and 0-100% of a weighting agent, wherein the reservoir protective agent is a compound mixture of calcium carbonate, magnesium oxide and magnesium carbonate. The drilling fluid has relatively good inhibition and lubrication performance, and can protect the shale gas reservoir.

Description

technical field [0001] The invention relates to the field of petroleum drilling engineering, in particular to an oil-based drilling fluid used for protecting shale gas reservoirs in long horizontal sections. Background technique [0002] Drilling fluid refers to the general term for various circulating fluids that meet the needs of drilling with its multiple functions during the oil and gas drilling process. Hydrodynamics, protection of oil and gas layers, etc. are important components of drilling engineering technology. Oil-based drilling fluid system is usually used for drilling long horizontal sections of shale gas. Oil-based drilling fluids refer to drilling fluids with oil as the continuous phase. However, due to the special geological conditions of the reservoir, the long construction period, and the special drilling technology, the long-term immersion of the horizontal section of the long open-hole section in the drilling fluid will cause great damage to the reservoi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/36C09K8/467C09K8/487
CPCC09K8/36C09K8/467C09K8/487C09K2208/34
Inventor 游云武章文斌危胜宏吴雪平刘衍前代红民吕成冬李思熊潇方琴
Owner 中石化石油工程技术服务有限公司
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