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Potassium-calcium composite ion inhibitor for well drilling liquid

A technology of composite ions and drilling fluids, which is applied to drilling compositions, chemical instruments and methods, etc., can solve the problems of increasing salinity, deterioration of drilling fluid rheological properties and wall-building properties, and increasing drilling fluid costs, etc. Achieve the effect of reducing filtration loss and protecting oil and gas layers

Inactive Publication Date: 2006-03-29
WESTERN DRILLING KELAMAYI DRILLING TECH INST
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  • Summary
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Problems solved by technology

However, because a single inorganic salt or organic salt inevitably contains a large number of anions, while increasing the salinity, the real useful cations do not increase, and the inhibitory effect on the drilling fluid is not enhanced, which leads to the rheological change of the drilling fluid. and wall-building deterioration
In order to adjust the performance of the drilling fluid, a large amount of treatment agent must be added, which increases the cost of the drilling fluid

Method used

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  • Potassium-calcium composite ion inhibitor for well drilling liquid
  • Potassium-calcium composite ion inhibitor for well drilling liquid
  • Potassium-calcium composite ion inhibitor for well drilling liquid

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Embodiment Construction

[0052]Potassium carbonate, calcium oxide, and iron lignosulfonate whose dry product mass ratio is 1:1:1 are prepared according to the following steps.

[0053] Step 1: Potassium carbonate will be dissolved in appropriate amount of H 2 O, then add anti-flocculation agent, and stir evenly under normal temperature conditions, so that the two substances can fully react chemically;

[0054] Step 2: Add calcium oxide to the substance obtained by the reaction in step 1, and stir evenly under normal temperature conditions to make it fully chemically reacted;

[0055] Step 3: Bake the substance obtained in step 2 until it is completely dry;

[0056] Step 4: Grinding and grinding the material obtained after baking in step 3 until passing through a 40# sieve cloth to obtain the present invention.

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Abstract

The composite potassium-calcium ion inhibitor for well drilling liquid consists of potassium carbonate, calcium oxide and at least one reflocculant through chemical reaction. The reflocculant includes lignin compound, lignin complex or humic acid. The composite potassium-calcium ion inhibitor has potassium ion as inhibiting ion and calcium ion as auxiliary inhibiting ion. The present invention provides inhibiting well drilling liquid with one kind treating agent with high inhibition, no useless acid radical ion, no side effect on the well drilling liquid and no negative effect on well drilling operation.

Description

technical field [0001] The invention relates to an inhibitor for drilling fluid, in particular to a potassium-calcium compound ion inhibitor for drilling fluid. Background technique [0002] With the gradual decline of world oil and natural gas reserves and the increasing consumption of oil and gas, oil drilling is becoming more and more difficult. It is mainly manifested in that with the depletion of oil and gas reserves in shallow reservoirs, the exploitation depth of oil wells continues to deepen, the complex formations encountered by drilling increase, and the drilling cost increases greatly. [0003] At present, in the field of oil drilling in the world and domestically, the instability of the shale well section wall has always been a problem that has not been completely solved by drilling technology. A large number of field practices have shown that in many difficult wells, the difficulty lies in the inability to solve the problem of wellbore instability in shale well...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/52
Inventor 黄治忠刘亚峰
Owner WESTERN DRILLING KELAMAYI DRILLING TECH INST
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