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Positive electricity production well treatment liquid and its preparation method

A technology for producing wells and treating fluids, which is applied in the fields of drilling fluids and completion fluids in oil drilling and well completion, and can solve problems such as the inability to inhibit the expansion and dispersion of clay in the oil layer, the increase in the amount of waste completion fluid, and the increase in clay content. Achieve the effects of improving the recovery value of oil layer permeability, increasing drilling speed and inhibiting dispersion

Active Publication Date: 2005-05-25
CHINA PETROLEUM & CHEM CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As mentioned above, the negatively charged system can easily hydrate, swell and disperse the clay particles. When the completion fluid comes into contact with the oil layer, it will inevitably cause damage to the oil and gas layer; the tiny solid particles will block the deep part of the oil and gas layer. reduce crude oil production
Moreover, all minerals in the oil layer contain clay, and this completion fluid cannot inhibit the swelling and dispersion of the oil layer clay, resulting in an increase in the clay content in the completion fluid. surroundings

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Example 1 The following components are used to prepare solid-free positive drilling fluid, perforating fluid, well flushing fluid, fracturing fluid, spacer fluid or gravel packing fluid:

[0044] 1% cationic polyacrylamide (CPAM)

[0045] 2% cationic starch (NCP)

[0046] The balance is water.

[0047] Wherein the cationic polyacrylamide, cationic starch and water are added into the reactor at room temperature (25° C.), and stirred thoroughly to obtain an aqueous composition.

Embodiment 2

[0048] Example 2 Add 0.5% aluminum chloride as an electrical stabilizer to the formula in Example 1, and use the same method to prepare solid-phase positive drilling fluid, perforating fluid, well flushing fluid, fracturing fluid, and spacer fluid or gravel pack fluid.

Embodiment 3

[0049] Example 3 Add 0.3% xanthan gum as a colloidal stabilizer to the formula in Example 2, and use the same method to prepare solid-free positive drilling fluid, perforating fluid, well flushing fluid, fracturing fluid, spacer fluid or gravel pack fluid.

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PUM

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Abstract

The invention provides a positively charged water-based production well treatment fluid system, which is equipped with a cationic fluid loss reducer while using a cationic viscosifier, and is optionally equipped with a positively charged production well treatment fluid Slurry compounding agent, electrical stabilizer, colloidal stabilizer, lubricant, oil reservoir protection agent and / or weighting agent make the production well treatment fluid system positively charged, and this positively charged production well treatment fluid can well solve the " To deal with the contradiction between "fluid stability" and "wellbore stability", it has the characteristics of strong ability to inhibit clay dispersion, good effect of protecting oil and gas layers, fast drilling speed, regular wellbore, and good salt resistance. The present invention also relates to the preparation method of the production well treatment fluid system and its use as drilling fluid and well completion fluid for oil drilling and well completion.

Description

technical field [0001] The invention relates to an electropositive production well treatment fluid used in oil drilling, well completion, workover, fracturing or production stimulation operations and a preparation method thereof. More specifically, the present invention relates to a drilling fluid and completion fluid used in oil drilling and well completion. Background technique [0002] When the production well treatment fluid is used as a drilling fluid for drilling, it has been faced with how to better solve the contradiction between "borehole wall stability", protection of oil and gas layers and "drilling fluid performance stability". Generally speaking, the anion system (negative charge) drilling fluid is beneficial to the stability of the drilling fluid itself, and the negative charge clay mineral is easy to expand and disperse in the drilling fluid. This expansion and dispersion effect is not conducive to the stability of the well wall. The stability and protection ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
Inventor 苏长明刘汝山许卫平关增臣于培志刘修善李家芬郭保雨崔迎春郭才轩李静
Owner CHINA PETROLEUM & CHEM CORP
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