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Carbonate drilling fluid

A drilling fluid and carbonate technology, applied in the direction of drilling composition, chemical instruments and methods, etc., can solve hidden dangers, well wall collapse and downhole safety issues, achieve good plugging performance, reduce drilling costs, and prevent dissolution Effect

Active Publication Date: 2015-01-14
CNPC XIBU DRILLING ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention provides a kind of carbonate drilling fluid, overcomes above-mentioned deficiencies in the prior art, and it can effectively solve the problem that the existing drilling fluid encounters a large section containing CO 3 2- 、HCO 3 - Formation or soluble carbonates and bicarbonates cause well wall collapse and cause a series of downhole safety hazards

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Example 1, the carbonate drilling fluid contains 8% to 20% soluble bicarbonate, 0.5% to 10% inhibitor, 0.1% to 5% plugging agent, 0.5% to 5% bentonite, and 0.5% to 5% bentonite by weight percentage. Loss agent 0.2% to 6%, coating agent 0.1% to 0.5%, weighting agent 0.5% to 70%, and the rest of water.

[0016] Below is the further optimization or / and improvement to above-mentioned embodiment 1:

[0017] According to requirements, the carbonate drilling fluid also contains 0.1% to 1.5% of a flow pattern regulator or / and 0.1% to 2% of a lubricant by weight percentage.

[0018] The soluble bicarbonate salt is sodium bicarbonate or potassium bicarbonate, as required. The soluble bicarbonate is most preferably sodium bicarbonate. At 20°C, the solubility of sodium bicarbonate and potassium bicarbonate in 100g of water are 9.6g and 33.7g respectively. CO in the carbonate drilling fluid obtained by the present invention 3 2- 、HCO 3 - soluble Ca in rock salt formations 2+...

Embodiment 2

[0023] Example 2, the difference with Example 1 is: Example 2 contains 63.8% water by weight percentage, bentonite 4%, zwitterionic polymer 0.2%, carboxymethyl starch 0.5%, hydrolyzed polyacrylonitrile ammonium salt 0.5% , Potassium-calcium compound inhibitor 5%, sulfonated phenolic resin 3%, cationic modified asphalt 5%, sodium bicarbonate 10%, barite 8%.

Embodiment 3

[0024] Embodiment 3, the difference with embodiment 1 and 2 is: embodiment 3 contains water 61.8% by weight percentage, bentonite 4%, zwitterionic polymer 0.2%, carboxymethyl starch 0.5%, hydrolyzed polyacrylonitrile ammonium salt 0.5%, potassium chloride 7%, sulfonated phenolic resin 3%, cationic modified pitch 5%, sodium bicarbonate 10%, barite 8%.

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Abstract

The invention relates to the technical field of drilling fluid for petroleum drilling, in particular to carbonate drilling fluid. The carbonate drilling fluid comprises the following components in percentage by weight: 8 percent to 20 percent of soluble bicarbonate, 0.5 percent to 10 percent of inhibitor, 0.1 percent to 5 percent of formation sealant and 0.5 percent to 5 percent of bentonite. According to the invention, when a soluble carbonate and soluble bicarbonate rock salt stratum is drilled, by a CO3<2-> and HCO3<-> ionization-solubility equilibrium principle, the carbonate drilling fluid obtained by the invention and CO3<2-> and HCO<3> in the rock salt stratum are enabled to reach the ionization-solubility equilibrium, so that the rock salt stratum is prevented from being dissolved and the aims of stable well wall and regular borehole diameter are fulfilled; and the carbonate drilling fluid has the characteristics of strong capacity of resisting to CO3<2-> and HCO3<-> pollution, strong hydrate inhibition capacity, good plugging property, good lubricity, stable high temperature performance, small damage to a reservoir and no pollution, so that the working efficiency is improved, the drilling cost is reduced and a series of underground potential safety hazards are reduced.

Description

technical field [0001] The invention relates to the technical field of drilling fluid for petroleum drilling, and relates to a carbonate drilling fluid. Background technique [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] Salt-gypsum formation is a general term for rock salt (alkali metal and alkaline earth metal chloride) formation and gypsum salt (sulfate) formation. In the salt-gypsum layer, there are also a large number of other minerals, such as common quartz, feldspar, carbonate rock salt and various clay minerals. Salt-gypsum layer is a formation that is often encountere...

Claims

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Application Information

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IPC IPC(8): C09K8/16
Inventor 黄治中李称心乔东宇郑义平王凤军
Owner CNPC XIBU DRILLING ENG
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