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Drilling fluid additive, drilling fluid and drilling method

A drilling fluid and additive technology, applied in wellbore/well components, chemical instruments and methods, earth-moving drilling, etc., can solve the problems of inability to match zeta potential, low zeta potential value, poor stabilization effect, etc. The effect is good, the composition is simple, and the drilling efficiency is improved

Active Publication Date: 2016-05-04
PETROCHINA CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a drilling fluid additive, a drilling fluid and a drilling method, which are used to solve the problem of low zeta potential value and low cation concentration of the drilling fluid in the prior art, which cannot be matched with the zeta potential of each layer of the formation, and the stabilization effect is not good. Technical defects such as poor salt resistance

Method used

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  • Drilling fluid additive, drilling fluid and drilling method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 1. Bentonite slurry

[0026] To the mixing water (Cl - content <6000mg / l) by adding a small amount of NaOH and decalcifying agent CPN to make the pH 9-10, add bentonite for drilling fluid according to the ratio of 90kg bentonite per cubic meter of water (1000L), stir, cycle and age for later use .

[0027] 2. Drilling fluid additives

[0028] The first additive comprises 3 parts of cationic inhibitor CPI and 26 parts of cationic coating agent CPH-26 according to the weight ratio;

[0029] The second additive comprises 8 parts of cationic inhibitor CPI, 29 parts of cationic coating agent CPH-29 parts and cationic fluid loss reducer CPF-18 parts according to the weight ratio;

[0030] The third additive (i.e. drilling fluid additive) includes the following components according to the weight ratio: 10 parts of cationic inhibitor CPI, 26 parts of cationic coating agent CPH-26 parts, cationic fluid loss reducer CPF-18 parts, cationic fluid loss reducer 2 parts of agent C...

Embodiment 2

[0032] 1. Bentonite slurry

[0033] Add a small amount of NaOH and calcium remover CPN to the slurry preparation water to make the pH 9-10, add bentonite for drilling fluid at the ratio of 100kg bentonite per cubic meter of water, stir, cycle and age before use.

[0034] 2. Drilling fluid additives

[0035] The first additive comprises 2 parts of cationic inhibitor CPI and 28 parts of cationic coating agent CPH-2 according to the weight ratio;

[0036] The second additive comprises 6 parts of cationic inhibitor CPI, 10 parts of cationic coating agent CPH-2 and 110 parts of cationic fluid loss reducer CPF according to the weight ratio;

[0037] The third additive includes the following components according to the weight ratio: 6 parts of cationic inhibitor CPI, 28 parts of cationic coating agent CPH, 110 parts of cationic fluid loss reducer CPF, 3 parts of cationic fluid loss reducer CPF, cationic 2 parts of blocking agent CPA.

Embodiment 3

[0039] 1. Bentonite slurry

[0040] Add a small amount of NaOH and calcium remover CPN to the slurry preparation water to make the pH 9-10, add bentonite for drilling fluid at a ratio of 80kg bentonite per cubic meter of water, stir, cycle and age before use.

[0041] 2. Drilling fluid additives

[0042] The first additive comprises 4 parts of cationic inhibitor CPI and 24 parts of cationic coating agent CPH-2 according to the weight ratio;

[0043] The second additive includes 10 parts of cationic inhibitor CPI, 28 parts of cationic coating agent CPH-28 parts and cationic fluid loss reducer CPF-16 parts according to the weight ratio;

[0044] The third additive includes the following components according to the weight ratio: 15 parts of cationic inhibitor CPI, 24 parts of cationic coating agent CPH, 14 parts of cationic coating agent CPH, 15 parts of cationic fluid loss reducer CPF, cationic 1 part of fluid loss reducer CPF, 1 part of cationic plugging agent CPA.

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Abstract

The present invention provides a drilling fluid additive, a drilling fluid and a drilling method. The drilling fluid additive comprises, by weight, 5-15 parts of a cationic inhibitor CPI, 4-8 parts of a cationic coating agent CPH-2, 5-10 parts of a cationic filtrate reducer CPF-1, 1-3 parts of a cationic filtrate reducer CPF, and 1-2 parts of a cationic plugging agent CPA. According to the present invention, the drilling fluid containing the drilling fluid additive has characteristics of high electric potential, good well wall stabilizing effect and good salt performance, and is especially suitable for the high-density balance stratum in the salt layer.

Description

technical field [0001] The invention belongs to the technical field of drilling, and in particular relates to a drilling fluid additive, a drilling fluid and a drilling method. Background technique [0002] Drilling is the project of using mechanical equipment to drill the formation into cylindrical holes with a certain depth. Drilling fluid is a circulating flushing medium used in the hole during drilling. It has various functions such as cleaning the bottom of the well, carrying cuttings, balancing the pressure of the well wall and formation, cooling and lubricating the drill bit and drill string, and hydraulically breaking rocks. Drilling fluid usually includes base slurry (such as bentonite slurry) and additives, which are mainly used to improve and adjust the performance of drilling fluid, such as weighting agent, inhibitor, coating agent, fluid loss reducer, lubricant, plugging agent, etc. [0003] During the drilling process, the stability of the borehole wall is usu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/035C09K8/24C09K8/22C09K8/20E21B21/00
Inventor 滕学清周志世秦宏德李宁孙俊贺江红李家学沈勤长陈林于连成王泽华张克勤杨川张欢庆
Owner PETROCHINA CO LTD
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