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Starch filtrate reducer for drilling fluid and preparing method thereof

A fluid loss control agent and drilling fluid technology, applied in chemical instruments and methods, drilling compositions, etc., can solve problems such as the inability to fully meet the requirements of drilling fluid reservoir protection, achieve easy implementation and popularization, reduce filtration The effect of good failure effect and low production cost

Inactive Publication Date: 2016-03-23
CHINA NAT OFFSHORE OIL CORP +2
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Among the commonly used fluid loss additives for drilling fluids, only starch and modified starch fluid loss additives can meet the basic requirements of reservoir protection, but the common raw starch, pregelatinized starch, cross-linked starch, grafted starch, etc. Modified starch cannot fully meet the requirements of drilling fluid for reservoir protection

Method used

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  • Starch filtrate reducer for drilling fluid and preparing method thereof
  • Starch filtrate reducer for drilling fluid and preparing method thereof

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preparation example Construction

[0023] The preparation method of an embodiment of the above-mentioned starch fluid loss reducer for drilling fluid comprises the following steps:

[0024] Take each raw material by mass parts;

[0025] The raw materials are uniformly mixed to obtain the starch fluid loss reducer for drilling fluid. Mixing can be performed in a kneader.

[0026] The preparation method of another embodiment of the above-mentioned starch fluid loss reducer for drilling fluid comprises the following steps:

[0027] Slurry preparation: put an appropriate amount of water in a container, measure the total mass of water and water as 100 parts, add 20-30 parts of starch, then add high-temperature stabilizer and alkalinity regulator in sequence according to the proportion, and mix to form a slurry . In the slurry preparation step, 20-30 parts by mass of starch are added, and 90-99 parts in the starch fluid loss control raw material. For example, 20-30 parts of starch are added to 70-80 parts by mass...

Embodiment 1

[0032] The following raw materials were weighed in parts by mass: 70 parts of potato starch, 20 parts of tapioca starch, 7 parts of canna starch, and 3 parts of magnesium oxide.

[0033] Mix uniformly with a kneader to obtain the starch fluid loss reducer for drilling fluid.

Embodiment 2

[0035] Weigh the following raw materials in parts by mass: 60 parts of potato starch, 30 parts of tapioca starch, 5 parts of canna starch, 7 parts of betel nut starch, and 5 parts of magnesium oxide.

[0036] Mix uniformly with a kneader to obtain the starch fluid loss reducer for drilling fluid.

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Abstract

The invention discloses a starch filtrate reducer for drilling fluid and a preparing method thereof. The starch filtrate reducer for the drilling fluid is prepared from, by mass, 90-99 parts of starch, 0-5 parts of high-temperature stabilizer and 1-5 parts of alkalinity modifier, wherein the starch comprises one or more of potato starch, tapioca starch, canna edulis ker starch and colocasia esculenta starch. The starch filtrate reducer for the drilling fluid has the advantages of being good in filtrate reducing effect, good in reservoir protection effect, capable of being liquefied and the like; a reservoir stratum section drilling fluid system prepared from the starch filtrate reducer has automatic flowback performance, liquefiable performance and the like, has no harm to a reservoir stratum, and is beneficial for protecting the reservoir stratum.

Description

technical field [0001] The invention relates to a starch fluid loss reducer for drilling fluid, in particular to a starch fluid loss reducer for drilling fluid and a preparation method thereof. Background technique [0002] Drilling fluid is an important fluid in drilling engineering. It is directly related to the safety and quality of drilling, and plays a vital role in the efficiency and level of oil recovery in an oil field. Excessive drilling fluid loss is one of the important reasons for wellbore instability and reservoir protection, especially in the process of horizontal well drilling, the reservoir protection of drilling fluid is very important, often determines whether an oil field can be economically developed , and the drilling fluid fluid loss control agent plays a key role in the protection of the reservoir. [0003] Among the commonly used fluid loss additives for drilling fluids, only starch and modified starch fluid loss additives can meet the basic requirem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/03
CPCC09K8/03
Inventor 张伟国许明标韦红术张俊斌林海春魏裕森
Owner CHINA NAT OFFSHORE OIL CORP
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