Fresh water-based micro bubble drilling fluid for drilling coal bed gas

A coalbed methane and drilling fluid technology, applied in the field of drilling fluids, can solve the problems of too many gas-type fluid production equipment, leakage, and difficulty in matching the leakage channels of plugging materials, achieves good compatibility, prevents gas-liquid stratification, and is beneficial to rock breaking effect

Active Publication Date: 2012-05-16
CHINA UNITED COALBED METHANE +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The main purpose of the present invention is to provide a freshwater based drilling fluid for coalbed methane drilling, aiming at the problems of the existing drilling fluids, such as difficulty in matching plugging materials and lost passages, and many on-site producing equipment for gas-type fluids. Micro-bubble drilling fluid to solve the leakage problem in the process of coalbed methane drilling

Method used

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  • Fresh water-based micro bubble drilling fluid for drilling coal bed gas

Examples

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Effect test

Embodiment 1

[0030] Embodiment 1, preparation of fresh water-based micro-bubble drilling fluid for coalbed methane drilling

[0031] The formula is: 400g of fresh water, 0.80g of sodium carbonate, 0.40g of sodium hydroxide, 0.40g of basic zinc carbonate, 1.60g of a flow regulator (composed of xanthan collagen and sodium tetraborate in a ratio of 1:1 by mass and part), hair Foaming agent 1.20g (composed of lauryl dimethyl amine oxide and sodium α-alkenyl sulfonate at a mass ratio of 2:1), stabilizer 1.60g (composed of petroleum ether, sorbitol oleate and The diol is composed in a ratio of parts by mass of 3:2:5). The mass ratio of each component is water: sodium carbonate: sodium hydroxide: basic zinc carbonate: flow regulator: foaming agent: stabilizer is 100:0.2:0.1:0.1:0.4:0.3:0.4.

[0032] According to the above formula, add sodium carbonate, sodium hydroxide, basic zinc carbonate, flow regulator, foaming agent and stabilizer to the fresh water in sequence under agitation to obtain fre...

Embodiment 2

[0033] Embodiment 2, preparation of fresh water-based micro-bubble drilling fluid for coalbed methane drilling

[0034] The formula is: 400g of fresh water, 0.80g of sodium carbonate, 0.40g of sodium hydroxide, 0.40g of basic zinc carbonate, 1.20g of flow regulator (consisting of xanthan gum and boric acid in a ratio of 2:1 by weight and number), foaming 0.80g of agent (composed of lauryl dimethyl amine oxide and sodium α-alkenyl sulfonate in a ratio of 1:1 by mass), 0.40g of stabilizer (composed of petroleum ether, sorbitol oleate and dodecyl Alcohols are composed in a ratio of parts by mass of 1:2:7). The mass ratio of each component is water: sodium carbonate: sodium hydroxide: basic zinc carbonate: flow regulator: foaming agent: stabilizer is 100:0.2:0.1:0.1:0.3:0.2:0.1.

[0035] The low-temperature microbubble drilling fluid for offshore oil drilling was prepared according to the method in Example 1, which was marked as 2# drilling fluid.

Embodiment 3

[0036] Embodiment 3, preparation of fresh water-based micro-bubble drilling fluid for coalbed methane drilling

[0037] The formula is: 400g of fresh water, 0.80g of sodium carbonate, 0.40g of sodium hydroxide, 0.80g of basic zinc carbonate, 1.20g of a flow regulator (composed of xanthan collagen and sodium tetraborate in a ratio of 2:1 in mass and parts), hair Foaming agent 0.80g (composed of lauryl dimethyl amine oxide and sodium α-alkenyl sulfonate at a mass ratio of 1:1), stabilizer 0.80g (composed of petroleum ether, sorbitol oleate and The diol is composed of the mass fraction ratio of 2:2:6). The mass ratio of each component is water: sodium carbonate: sodium hydroxide: basic zinc carbonate: flow regulator: foaming agent: stabilizer is 100:0.2:0.1:0.2:0.3:0.2:0.2.

[0038] The low-temperature microbubble drilling fluid for offshore oil drilling was prepared according to the method in Example 1, which was marked as 3# drilling fluid.

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Abstract

The invention relates to a fresh water-based micro bubble drilling fluid for drilling coal bed gas. The fresh water-based micro bubble drilling fluid for drilling the coal bed gas is prepared from fresh water, sodium carbonate, sodium hydroxide, basic zinc carbonate, a flow pattern regulator, a foaming agent and a stabilizing agent. The main performance of the fresh water-based micro bubble drilling fluid for drilling the coal bed gas is not lower than that of a drilling fluid used in the conventional coal bed gas drilling process, and the drilling fluid has a good leakage controlling and leakage plugging effect, solves the problem that a low pressure easily-leaked coal bed is easily leaked in the drilling process, and can effectively improve the bearing capacity of a stratum; when the coal bed is not drilled and leaked, the drilling fluid has various engineering properties required by drilling; and when a leaked coal bed is met, the drilling fluid automatically plugs the stratum and drilling is continued; through the proportion of a treatment agent, the poor soil solid-phase contamination resistance and calcium resistance of the drilling fluid are improved; and the properties of the drilling fluid are easy to maintain.

Description

technical field [0001] The invention relates to a drilling fluid, in particular to a freshwater-based microbubble drilling fluid for coalbed methane drilling. Background technique [0002] Drilling fluid is one of the necessary materials used to balance formation pressure and ensure safe and smooth drilling during drilling. During the drilling process, lost circulation is the phenomenon that a large amount of drilling fluid leaks into the formation when the formation pressure is lower than the fluid column pressure. Lost circulation will cause downhole accidents or complex situations, resulting in prolonged construction time, increased operating costs, and even the scrapping of drilled wells, resulting in serious waste of resources and huge economic losses. In 2003, the cost of leak plugging alone in the world was about 800 million U.S. dollars, and did not include the investment in post-treatment accidents caused by downhole accidents caused by well circulation. CBM exist...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/38C09K8/42E21B43/00E21B33/10
CPCY02P20/141
Inventor 郭本广傅小康孟尚志刘一楠郑力会赵军曹园莫日和韩子轩
Owner CHINA UNITED COALBED METHANE
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