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Salt resistant and temperature resistant starch type drilling fluid loss agent and preparation method thereof

A filtrate reducer and starch technology, applied in chemical instruments and methods, drilling compositions, etc., can solve problems such as difficulty in meeting performance requirements, avoid gelatinization and agglomeration, increase etherification degree, and reduce energy consumption little effect

Inactive Publication Date: 2019-10-25
湖北江汉利达石油物资装备有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these ordinary natural polymers or natural modified polymer fluid loss control agents are difficult to meet the performance requirements of the mud system required by the saturated brine system in saline formations

Method used

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  • Salt resistant and temperature resistant starch type drilling fluid loss agent and preparation method thereof
  • Salt resistant and temperature resistant starch type drilling fluid loss agent and preparation method thereof
  • Salt resistant and temperature resistant starch type drilling fluid loss agent and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0033]Embodiment 1: A salt-resistant and temperature-resistant starch drilling fluid loss reducer, its formula components and contents are as shown in Table 1 (1 parts by weight=1kg or 1 parts by weight=1g), the present embodiment uses 1 part by weight = 1 g as an example. Wherein the starch is cornstarch, the chloroacetic acid is a crystalline powder, and the sodium hydroxide is a flake solid. The preparation process of the salt-resistant and temperature-resistant starch drilling fluid loss reducer comprises the following steps:

[0034] S1. Starch pretreatment: Add starch to the reaction kneader at room temperature, add puffing treatment agent to the starch at a rate of v=1-1.2 parts / min while stirring, and always keep the added weight of alum and baking soda The ratio of the number of parts is 2:1, and the stirring time t1 is 30 minutes until the stirring and mixing are uniform to obtain the expanded starch;

[0035] S2. Starch alkalization: adding sodium hydroxide to the...

Embodiment 2

[0040] Embodiment 2: A salt-resistant and temperature-resistant starch-based fluid loss reducer for drilling wells. The difference between this embodiment and Embodiment 1 is that its formula components and their contents are as shown in Table 1 (1 parts by weight=1kg), t1 is 35min, and t2 is 75min.

Embodiment 3

[0041] Embodiment 3: A salt-resistant and temperature-resistant starch-based fluid loss reducer for drilling wells. The difference between this embodiment and Embodiment 1 is that its formula components and their contents are as shown in Table 1 (1 parts by weight=1kg), t1 is 40min, and t2 is 90min.

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Abstract

The invention discloses a salt resistant and temperature resistant starch type drilling fluid loss agent and a preparation method thereof, and relates to the technical field of fluid loss agents. Theformula is prepared from the following components in parts by weight: 100-125 parts of starch, 30-60 parts of an expansion treatment agent, 10-20 parts of sodium hydroxide, and 25-50 parts of chloroacetic acid, wherein the expansion treatment agents include alums and sodium bicarbonate; the preparation method of the salt resistant and temperature resistant starch type drilling fluid loss agent includes the following steps of S1, starch pretreatment, S2, starch alkalization, S3, starch etherification, and S4, dispersion drying. The salt resistant and temperature resistant starch type drilling fluid loss agent has the technical effects of high ability of resistance to saturated salt water and good temperature resistance.

Description

technical field [0001] The invention relates to the technical field of fluid loss reducers, in particular to a salt-resistant and temperature-resistant starch drilling fluid loss reducer and a preparation method thereof. Background technique [0002] Drilling fluid is one of the most used oilfield chemicals, and fluid loss control agent is a very important additive in drilling fluid. When the fluid loss of drilling fluid is too large, it will not only lead to the loss of drilling fluid, but also lead to the collapse of the well wall and the pollution of the reservoir and other serious consequences. The fluid loss reducer mainly forms a flexible, thin and dense filter cake with low permeability on the well wall, which can significantly reduce the drilling fluid fluid loss, maintain a stable well wall, and ensure fast and safe drilling. However, in some high-salt formations, the rhythmic layer of salt rock and gypsum rock is more than 1,500 meters thick, and the deep well is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B31/12C09K8/035
CPCC08B31/12C09K8/035
Inventor 范广潜陈连明刘绍美杨仕民
Owner 湖北江汉利达石油物资装备有限公司
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