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Brine-based drilling fluid and preparation method thereof

A preparation method, drilling fluid technology, applied in the direction of chemical instruments and methods, drilling composition, etc., can solve the problem of engraving and testing its performance, to avoid clay softening and drill bit balling, increase drilling cost and drilling time, anti-pollution It can reduce the probability of sticking, reduce the drilling time and reduce the cost.

Pending Publication Date: 2021-12-31
YANGTZE UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation cost of oil-based drilling fluid is much higher than that of water-based drilling fluid, and it will have a serious impact on the ecological environment near the well site when used, and the ROP of oil-based drilling fluid is generally low, resulting in low ROP and bit life. Short stubborn problem greatly increases drilling cost and drilling time
The high-performance water-based drilling fluid is not only environmentally friendly, but its production cost is lower than that of oil-based drilling fluids. The strength and stability of the wall of the rock well, its performance needs to be checked at all times during use to avoid clay softening and ball bagging of the drill bit, and the anti-pollution and temperature resistance performance is poor

Method used

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  • Brine-based drilling fluid and preparation method thereof
  • Brine-based drilling fluid and preparation method thereof
  • Brine-based drilling fluid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The brine base drilling fluid described in the present embodiment 1 is constituted by the following components in mass percentage:

[0035] 1% fluid loss reducer JHFR-HP, 0.2% lubricant JHFD-S, 4% bentonite, 20%~84% special calcium chloride weighting agent, and the balance is water.

[0036] For the brine-based drilling fluid obtained in Example 1, the curve of the viscosity of the brine-based drilling fluid tested at 80°C as a function of density is as follows: figure 1 shown (see figure 1 ).

[0037] From figure 1 It is clearly seen that when the density of the brine drilling fluid of embodiment 1 reaches 1.60g / cm 3 When , the viscosity of the brine drilling fluid system can reach 200mPa·s, fully meeting the sand-carrying requirements during on-site drilling.

Embodiment 2

[0039] Each component of the brine base drilling fluid described in the present embodiment 2 is calculated according to the following mass percentages:

[0040] 0.5%~2% of JHFR-HP, 0.10% of JHFR-S, 50% of special calcium chloride weighting agent, 4% of bentonite, and the balance is water.

[0041] The preparation of the brine base drilling fluid of embodiment 2:

[0042] Step 1, a) Weigh respectively 0.5% JHFR-HP, 0.10% JHFR-S, 50% special calcium chloride weighting agent, 4% bentonite and water by mass percentage;

[0043] b) Weigh and weigh 1% of JHFR-HP, 0.10% of JHFR-S, 50% of special calcium chloride weighting agent, 4% of bentonite and water in percentage by mass;

[0044] c) Weigh and weigh 1.5% of JHFR-HP, 0.10% of JHFR-S, 50% of special calcium chloride weighting agent, 4% of bentonite and water according to mass percentage;

[0045] d) Weigh and weigh 2% of JHFR-HP, 0.10% of JHFR-S, 50% of special calcium chloride weighting agent, 4% of bentonite and water accordin...

Embodiment 3

[0052] The brine base drilling fluid described in the present embodiment 3 is made up of following mass percentage:

[0053] JHFR-HP: 1%;

[0054] JHFR-S: 0.05%~0.20%;

[0055] Bentonite: 2%;

[0056] Special calcium chloride weighting agent: 70%;

[0057] The preparation of the brine base drilling fluid of embodiment 3:

[0058] Step 1, a) Weigh 1% of JHFR-HP, 0.05% of JHFR-S, 70% of special calcium chloride weighting agent, 2% of bentonite and water by mass percentage;

[0059] b) Weigh 1% of JHFR-HP, 0.10% of JHFR-S, 70% of special calcium chloride weighting agent, 2% of bentonite and water according to mass percentage;

[0060] c) Weigh 1% of JHFR-HP, 0.15% of JHFR-S, 70% of special calcium chloride weighting agent, 2% of bentonite and water according to mass percentage;

[0061] d) Weigh 1% of JHFR-HP, 0.20% of JHFR-S, 70% of special calcium chloride weighting agent, 2% of bentonite and water according to mass percentage;

[0062] Step 2. Put the weighed special cal...

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Abstract

The invention relates to a brine-based drilling fluid and a preparation method thereof, and belongs to the technical field of petroleum and natural gas drilling engineering. The brine-based drilling fluid is prepared from JHFR-HP, JHFR-S, bentonite and a special calcium chloride weighting agent according to a certain mass percent, the preparation method is simple and convenient to operate, an ideal semi-permeable membrane is formed on the surface of clay for shale drilling operation, the situation that shale absorbs free water, consequently, the strength and near-well stress of the shale are greatly changed is effectively avoided, and the stability of the well wall is greatly improved; performance detection does not need to be conducted all the time during operation, temperature resistance is good, pollution resistance is high, the mechanical rotating speed is high, the service life of the drill bit is long, preparation and maintenance are convenient, rheological property is appropriate, collapse resistance is good, and cost is effectively reduced. The problems that an existing oil-based drilling fluid is high in preparation cost, prone to causing environmental pollution, low in drilling speed and short in drill bit service life, and the water-based drilling fluid is poor in pollution resistance and temperature resistance, the operation process needs to be detected all the time and use is inconvenient are solved.

Description

technical field [0001] The invention relates to a brine-based drilling fluid and a preparation method thereof, belonging to the technical field of oil and gas drilling engineering. Background technique [0002] In recent years, with the sharp increase in demand for oil resources in my country, the exploitation of unconventional reservoirs such as shale and tight sandstone has become the focus. During the drilling operation, the instability of the well wall often leads to a series of problems such as low ROP, stuck pipe, poor cementing conditions, large wear of the drill pipe, and collapse of the borehole or wellbore, which not only increases the drilling cycle, but also increases the cost of drilling fluid , Improper handling and even vicious accidents may occur. The "low pressure, low permeability, and low yield" development status of shale and tight sandstone forces people to try their best to reduce exploration and development costs in order to obtain better economic ben...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/16
CPCC09K8/16
Inventor 宋永涛余维初樊平天肖想松高健津周东魁张颖舒文明吴爱斌周五余镭李玉敏杨世楚
Owner YANGTZE UNIVERSITY
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