Potassium metasilicate polymeric alcohol water base drilling fluid

A technology of potassium silicate and drilling fluid, which is applied in drilling compositions, chemical instruments and methods to achieve the effects of good rheology, good lubricity and strong inhibition.

Inactive Publication Date: 2012-03-28
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem with this system is that there is no instrument for detecting the concentration of potassium and calcium ions on site, resulting in insufficient content of potassium and calcium ions in the actual drilling, which seriously affects the anti-slump performance of this type of drilling fluid. In high-density drilling fluid, this The problem is more prominent
Usually, silicates and polyalcohols are added to the drilling fluid system as inhibitors and lubricants respectively, and they are not used in combination

Method used

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  • Potassium metasilicate polymeric alcohol water base drilling fluid
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  • Potassium metasilicate polymeric alcohol water base drilling fluid

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Embodiment 1: the preparation method of potassium silicate polyalcohol water-based drilling fluid:

[0013] The preparation method of the potassium silicate polyalcohol water-based drilling fluid is: firstly measure 1000 grams of tap water and add 40 grams of sodium bentonite, stir at a low speed for 60 minutes, then stir at a high speed for 30 minutes, maintain at room temperature for 24 hours, then add 40 grams of sodium bentonite under high-speed electric stirring. Add 6 grams of powdery instant potassium silicate FP-V and stir for 5 minutes, add 6 grams of viscosifier HV-CMC and stir for 5 minutes, add 4 grams of fluid loss reducer JT888 and stir for 5 minutes, add 20 grams of polymeric alcohol JLX-B-S and stir for 5 minutes, add 8 grams Stir with KCl for 5 minutes, then slowly add 40% NaOH dropwise to adjust the pH to 11.5, and continue stirring for 15 minutes to obtain the potassium silicate polyalcohol water-based drilling fluid.

Embodiment 2

[0014] Embodiment 2: rheological performance evaluation

[0015] The basic properties of the potassium silicate polyalcohol drilling fluid system before and after aging were evaluated. The potassium silicate polyalcohol drilling fluid system was aged for 16 hours at different temperatures, cooled to room temperature, and then stirred for 5 minutes to measure the apparent viscosity AV and plasticity of the system. Properties such as viscosity PV, dynamic shear force YP and fluid loss, the experimental results are shown in Table 2:

[0016] Table 2 Evaluation of rheological properties of drilling fluids

[0017]

[0018] Remark: Potassium silicate drilling fluid system formula: 4% soil slurry + 4% FP-V + 0.4% HV-CMC + 0.4% JT888 + 1% KCl + appropriate amount of NaOH (concentration is 40%, adjust pH to 11.5), potassium silicate polymerization Alcohol drilling fluid system formula: 4% soil slurry + 4% FP-V + 0.4% HV-CMC + 0.4% JT888 + 3% JLX-B-S + 1% KCl + appropriate amount...

Embodiment 3

[0020] Embodiment 3: performance evaluation of wall-building by loss of water

[0021] The water-losing wall-building property of drilling fluid is an important performance of drilling fluid, which has a very important influence on the stability of the wellbore wall in loose, broken and water-unstable formations. In this paper, the water loss and wall-building properties of the potassium silicate polyalcohol drilling fluid system were evaluated, and the experimental results are shown in Table 3:

[0022] Table 3 Drilling fluid system loss of water wall building performance

[0023]

[0024] It is not difficult to see from the experimental data in Table 3 that the API dehydration, HTHP dehydration and mud cake thickness of the two systems after aging are all increased compared with those before aging, but after adding polyalcohol, the API dehydration, HTHP and mud cake thickness of the system increased. The dehydration of the cake has improved. It can be seen that the adso...

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Abstract

The invention relates to a potassium metasilicate polymeric alcohol water base drilling fluid for preventing collapse and tool sticking in oil and gas field drilling operation. The drilling fluid overcomes complex situations easily caused by high temperature and pressure under a deep well and a super deep well. A technical scheme is as below: raw materials for preparing the drilling fluid comprise 40-60 parts of sodium bentonite, 40-60 parts of powder instant potassium metasilicate, 3-6 parts of tackifier, 4-6 parts of fluid loss additive, 20-40 parts of plugging agent, 8-13 parts of KCl and 1000 parts of tap water, wherein a NaOH adjusting system has a pH of 11.5. A preparation method of the drilling fluid comprises the following steps: taking 1000g of tap water; adding sodium bentonite, powder instant potassium metasilicate, tackifier, fluid loss additive, plugging agent and KCl; adjusting a pH to 11.5 by a 40% NaOH and continuing stirring for 15 min to obtain the potassium metasilicate polymeric alcohol water base drilling fluid. The product of the invention has good rheological property, water loss wall-building property, strong inhibition, good plugging capability, good lubricity and good heat stability, and can satisfy requirements of safe well drilling under complex conditions.

Description

technical field [0001] The invention relates to a method for suppressing the hydration of a strongly water-sensitive formation (a formation with high montmorillonite content) used in high-temperature and high-pressure drilling operations in oil and gas fields, reducing the diameter shrinkage of the formation due to hydration, and preventing weak water-sensitivity Potassium silicate polyalcohol water-based drilling fluid with stable rheology for formation blockage and collapse caused by pressure transmission, capillary pressure, hydration, etc. Background technique [0002] In recent years, my country's oil drilling development has gradually developed from shallow to deep, from simple to complex. Due to the relatively high downhole temperature and pressure in deep and ultra-deep wells, especially when drilling in complex formations, the performance of downhole drilling fluids is prone to large changes, which can easily lead to some downhole complex situations, such as collap...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/24
Inventor 王平全白杨
Owner SOUTHWEST PETROLEUM UNIV
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