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Low-corrosion low-solid phase high-inhibition drilling fluid and preparation method thereof

A low-solid-phase, strong-inhibition technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of low-corrosion drilling tools, corrosion, etc., to achieve increased liquid viscosity, low overall cost, and reduced corrosion rate Effect

Active Publication Date: 2015-07-08
CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the above-mentioned problems existing in the drilling fluid used in the existing horizontal well drilling technology, and to provide a low-corrosion, low-solid and strong-inhibition drilling fluid and a preparation method. The present invention has good liquid phase weighting ability to achieve low solid phase It has the characteristics of strong inhibition and low corrosion, which can solve the current corrosion problem of drilling tools

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A drilling fluid with low corrosion, low solid phase and strong inhibition, including the following substances in mass percentage:

[0042] Inorganic soluble weighting agent 10%;

[0043] Viscosity raising agent 0.1%;

[0044] Filtrate reducer 0.5%;

[0045] Alkalinity control agent 0.1%;

[0046] Oxygen scavenger 0.5%;

[0047] Corrosion inhibitor 0.1%;

[0048] Preservatives 0.03%;

[0049] The balance is water.

[0050] In the present invention, the inorganic soluble weighting agent is composed of sodium sulfate as a weighting agent, sodium sulfite as an oxygen scavenger and a weighting agent, potassium sulfate as an inhibitor and a weighting agent, and the ratio of the components is 28:1 : 11. Sodium sulfite is used as an oxygen scavenger and weighting agent, and diethylhydroxylamine oxygen scavenger should be added separately. Oxygen effect can control the oxygen content in the drilling fluid below 2.0mg / m, which is better than using any one of them alone to...

Embodiment 2

[0064] This embodiment is basically the same as the above-mentioned embodiment, the main differences are as follows:

[0065] A drilling fluid with low corrosion, low solid phase and strong inhibition, including the following substances in mass percentage:

[0066] Inorganic soluble weighting agent 20%;

[0067] Viscosity raising agent 0.3%;

[0068] Filtrate reducer 1.0%;

[0069] Alkalinity control agent 0.3%;

[0070] Oxygen scavenger 0.8%;

[0071] Corrosion inhibitor ~ 0.2%;

[0072] Preservatives 0.05%;

[0073] The balance is water.

[0074] In the present invention, the fluid loss control agent is two kinds of carboxymethyl starch or hydroxypropyl starch according to any ratio.

[0075] A drilling fluid with low corrosion, low solid phase and strong inhibition and a preparation method thereof, comprising the following steps:

[0076] a. According to the proportion, add fluid loss reducer and viscosity enhancer respectively into the water, stir well and mix ...

Embodiment 3

[0081] This embodiment is basically the same as the above-mentioned embodiment, the main differences are as follows:

[0082] A drilling fluid with low corrosion, low solid phase and strong inhibition, including the following substances in mass percentage:

[0083] Inorganic soluble weighting agent 15%;

[0084] Viscosity raising agent 0.2%;

[0085] Filtrate reducer 0.7%;

[0086] Alkalinity control agent 0.2%;

[0087] Oxygen scavenger 0.6%;

[0088] Corrosion inhibitor 0.15%;

[0089] Preservatives 0.04%;

[0090] The balance is water.

[0091] The present invention also includes 1.0-2.0% of lubricant, the lubricant is polyoxyethylene castor oil, but not limited to polyoxyethylene castor oil, any one with equivalent properties can be used.

[0092] A drilling fluid with low corrosion, low solid phase and strong inhibition and a preparation method thereof, comprising the following steps:

[0093] a. According to the proportion, add fluid loss reducer and viscosit...

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Abstract

The invention discloses a low-corrosion low-solid phase high-inhibition drilling fluid and a preparation method thereof. The low low-corrosion low-solid phase high-inhibition drilling fluid comprises the following materials in percentage by weight: 10%-20% of soluble weighting agents, 0.1%-0.3% of viscosifiers, 0.5%-1.0% of fluid loss additives, 0.1%-0.3% of alkalinity control agents, 0.5%-0.8% of deoxidizers, 0.1%-0.2% of inhibitors, 0.03%-0.05% of preservatives and the balance of water. The low low-corrosion low-solid phase high-inhibition drilling fluid disclosed by the invention has good liquid-phase weighting capability, realizes the low-solid phase and high-inhibition characteristic and can solve the corrosion problem of the traditional drilling tool due to a low-corrosion characteristic.

Description

technical field [0001] The invention relates to a drilling fluid formula and preparation method in drilling operations in oil and gas fields, which is a low-corrosion, low-solid, strong-inhibition drilling fluid suitable for horizontal well drilling, especially for drilling in complex lithological heterogeneous formations with long horizontal sections and Preparation. Background technique [0002] With the extensive application of long horizontal well drilling technology around the world, the unique geological factors of reservoirs, such as: extremely developed carbonaceous mudstone and coal seam, high degree of hydration and easy collapse of mud shale; trajectory adjustment due to reservoir heterogeneity Frequent drilling, coupled with complex formations, makes downhole cleaning more difficult, and the torque is too high (more than 30KN.m) when drilling in the horizontal section exceeding 1,000 meters, which poses a great threat to safe drilling. [0003] In order to solve...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/12
Inventor 林海郑玉辉张振活涂海海赵建震陈磊董海东崔贵涛赵向阳蒋振伟凡帆郝超曲波赵雷
Owner CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD
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