Potassium carbonate polyamine drilling fluid

A potassium carbonate polyamine drilling and drilling fluid technology, which is applied in the field of drilling fluid, can solve the problems of increased salinity of drilling fluid, lower use efficiency of other treatment agents, and no positive contribution to performance, so as to reduce the tendency of absorbing water, Strong inhibitory ability, the effect of inhibiting hydration

CN101747876AInactive Publication Date: 2010-06-23WESTERN DRILLING KELAMAYI DRILLING TECH INST
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2010-06-23
Estimated Expiration
Not applicable · inactive patent
Patent Text Reader

Abstract

The invention relates to a potassium carbonate polyamine drilling fluid used for the petroleum drilling process. The potassium carbonate polyamine drilling fluid mainly comprises 1-60 percent of potassium carbonate, 0.5-25 percent of calcium oxide, 0.5-5 percent of polyamine shale inhibiting agent, 0-5 percent of bentonite, 0.5-3 percent of filter reducer, 0.1-0.5 percent of coating agent, 0.1-0.8 percent of tackifier, 0.5-5 percent of plugging agent, 0.1-2 percent of lubricating agent and a proper amount of weighing agent (added according to the requirement). The potassium carbonate polyamine drilling fluid can provide K+ with high concentration and has strong inhibiting capability on shale; the potassium carbonate and the calcium oxide react in equal mole ratio to generate micrometer and nanometer calcium carbonate superfine powder, thus CO32-anions generated by dissolving the potassium carbonate can be removed, the mineralization can be reduced and the influence of high mineralization on the action efficiency of other processing agents can be eliminated; and by matching, the calcium carbonate superfine powder can be deformed into asphalt and paraffin particles which can be usedfor plugging a microcrack shale stratum.
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Description

technical field

[0001] The invention relates to a drilling fluid used in the field of petroleum drilling engineering, which belongs to a drilling fluid which has a strong inhibitory effect on strong water-sensitive mud shale formations. technical background

[0002] Drilling fluid is a working fluid that has many functions during drilling, such as carrying and removing cuttings, cooling and lubricating the drill bit, balancing formation pressure, protecting the stability of the wellbore wall and protecting the oil layer from damage. Its performance directly affects drilling efficiency and downhole drilling. Safety and cost control are important components of drilling engineering technology.

[0003] In drilling engineering, we often encounter strong water-sensitive mud shale formations, which are likely to cause complex accidents such as bit bagging, well wall collapse, well diameter reduction, torque increase, and drilling tool jamming, which will bring great harm to drilli...

Examples

Embodiment 1

[0025] Potassium carbonate polyamine drilling fluid is prepared by the following components (weight volume percentage)

[0026] Tap water + 1.2% polyanionic cellulose + 0.5% CHM + 0.2% XC + 10% potassium carbonate + 4% calcium oxide + 2% polyamine + 5% emulsified asphalt + 0.5% RH101 (low fluorescence lubricant) + 35% weight spar

Embodiment 2

[0028] Potassium carbonate polyamine drilling fluid is prepared by the following components (weight volume percentage)

[0029] Tap water + 1.5% polyanionic cellulose + 0.5% CHM + 0.2% XC + 20% potassium carbonate + 8% calcium oxide + 2% polyamine + 5% emulsified asphalt + 0.5% RH101 (low fluorescence lubricant) + 35% weight spar

Embodiment 3

[0031] 4% bentonite slurry + 1.2% polyanionic cellulose + 0.5% CHM + 0.1% XC + 10% potassium carbonate + 4% calcium oxide + 2% polyamine + 5% emulsified asphalt + 0.5% RH101 (low fluorescence lubricant) + 35% barite

[0032] Potassium carbonate polyamine drilling fluid performance table

[0033] drilling fluid

Experimental conditions

D

FL

PV

YP

gel

Example 1

120℃ hot rolling for 16h

1.33

3.2

24

12

3 / 7

Example 2

120℃ hot rolling for 16h

1.36

3

26

9

2 / 6

Example 3

120℃ hot rolling for 16h

1.34

2.4

32

14

3 / 15

[0034] D: Drilling fluid density, g / cm 3

[0035] FL: API filtration loss, mL

[0036] PV: plastic viscosity of drilling fluid, mPa s

[0037] YP: dynamic shear force of drilling fluid, Pa

[0038] Gel: drilling fluid initial shear force / drilling fluid final shear force, Pa