Water-based drilling fluid for drilling, and preparation method and purpose thereof

A drilling fluid and water-based technology, applied in the field of drilling water-based drilling fluid and its preparation, can solve the problems of unstable oil-based drilling fluid cost, failure to obtain core hole wall, etc. The effect of inhibiting dissolution

Inactive Publication Date: 2014-12-17
BEIJING INST OF EXPLORATION ENG
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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a water-based drilling fluid for drilling, which overcomes the problems in the prior art that the water-based drilling fluid is prone to failure to get the core or the hole wall is unstable due to the expansion of the pore diameter and the cost of the oil-based drilling fluid is high. defect

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  • Water-based drilling fluid for drilling, and preparation method and purpose thereof
  • Water-based drilling fluid for drilling, and preparation method and purpose thereof
  • Water-based drilling fluid for drilling, and preparation method and purpose thereof

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Embodiment Construction

[0019] The principles and features of the present invention are described below in conjunction with the following examples, which are only used to explain the present invention and are not intended to limit the scope of the present invention.

[0020] The preparation method of water-based drilling fluid for drilling in Example 1 to Example 6 of the present invention is as follows: take bentonite and partially hydrolyzed polyacrylamide in parts by weight, dissolve them in equal parts of water respectively, stir evenly, and then add the above two solutions after mixing Calcium chloride, magnesium chloride, viscosifier, fluid loss reducer and defoamer can be prepared by fully stirring evenly, which is suitable for water-based drilling fluid for drilling of potassium rock ore bodies containing episprite.

[0021] The weight ratio of each raw material described in embodiment 1 to embodiment 6 is shown in table 1.

[0022] See Table 2 for the measurement data of the effect of adding...

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Abstract

The invention relates to a water-based drilling fluid for drilling and a preparation method and purpose thereof. The drilling fluid comprises the following raw materials by weight: 100 portions of water, 50-150 portions of calcium chloride, 40-100 portions of magnesium chloride, 1-10 portions of bentonite, 0.1-0.5 portion of partially hydrolyzed polyacrylamide, 0.1-0.5 portion of tackifier, 0.1-5 portions of a filtration reducing agent and 1-5 portions of a defoaming agent. The water-based drilling fluid for drilling of the invention can effectively inhibit dissolving capacity of potassium chloride and tachhydrite, can greatly improve rock core recovery rate of potassium rock ore containing tachhydrite when used in drilling of potassium rock ore containing tachhydrite and has strong inhibition. The invention is conducive to the stability of the hole wall, and can provide technical support for the construction of potassium salt drilling in our country.

Description

technical field [0001] The invention relates to a water-based drilling fluid for drilling, a preparation method and application thereof, and belongs to the field of drilling fluids. Background technique [0002] At present, saturated brine drilling fluid is generally used when drilling potash ore bodies. The main component of potassium rock ore bodies is potassium chloride. Due to the high solubility of potassium chloride, the use of saturated brine drilling fluid generally has the problem of low core recovery rate. When the potash ore body contains epispar, the core cannot be obtained, or the hole wall is unstable due to the expansion of the hole diameter. This is because the main components of epispar are calcium chloride and magnesium chloride, which have extremely high solubility and are greatly affected by temperature. When there are spars in the formation, in order to ensure the quality of coring, generally only oil-based drilling fluid can be used to complete the dr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/24
CPCC09K8/24
Inventor 陶士先付帆王永全黄卫东熊正强纪卫军柳福德
Owner BEIJING INST OF EXPLORATION ENG
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