Shale strong-inhibition nano plugging water-based drilling fluid

A water-based drilling fluid, strong suppression technology, applied in the direction of drilling composition, chemical instruments and methods, etc., can solve the problems of poor wellbore stability, high temperature gelation, poor pollution resistance, etc., and achieve strong suppression plugging capacity, reduced collapse pressure, good plugging effect

Active Publication Date: 2017-05-10
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Advantages and disadvantages of water-based drilling fluids compared with conventional drilling fluids. The advantages of water-based drilling fluids are: ①Environmental protection; Poor wall stability; ②The thermal stability is relatively poor, and it is easy to gel at high temperature; ③Poor pollution resistance (solid phase and CO 2 、H 2 S gas pollution), heavy maintenance and processing workload; ④ Insufficient lubrication and anti-seize ability; ⑤ Poor sealing effect of cracks

Method used

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  • Shale strong-inhibition nano plugging water-based drilling fluid

Examples

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Comparison scheme
Effect test

example 1

[0018] Example 1: Preparation method of water-based drilling fluid with strong inhibitory nano-plugging for shale.

[0019] The preparation method of the water-based drilling fluid with strong inhibitory nano-sealing for shale is:

[0020] First measure 1000 grams of tap water and heat it up to 70°C, add 40 grams of bentonite and stir for 10 minutes under electric stirring at a low speed of 500r / min; then add 2 grams of sodium carbonate, stir for 20 minutes, pre-hydrate for 24 hours at normal temperature and pressure, and then stir for 15 minutes Add 7 grams of tackifier 80A-51 and stir for 5 minutes; then add 150 grams of polyacrylamide potassium salt and stir for 10 minutes, add 20 grams of fluid loss reducer HDF and stir for 10 minutes, add 0.5 grams of viscosity reducer XY27 and stir for 5 minutes, add Stir 50 grams of calcium carbonate powder (1250 mesh: 1500 mesh: 2000 mesh = 1:3:1) for 20 minutes, add 50 grams of polyalcohol and stir for 5 minutes; then measure 200 gram...

example 2

[0021] Example 2: The rolling recovery rate of the drilling fluid system of the present invention was measured by using an XGRL-2 type roller heating furnace.

[0022] (1) Rolling recovery rate experiment

[0023] Table 2 Rolling recovery test results of water-based drilling fluid system with strong inhibitory nano-plugging for shale

[0024] Drilling Fluid Formula Experimental conditions Recovery mass (g) Recovery rate(%) Clear water + 50g red bed soil 180℃ / 16h 5.64 11.28 Strong inhibitory nano drilling fluid system for shale+50g 180℃ / 16h 49.16 98.32

[0025] Note: 1) The red layer soil is Sichuan red layer soil debris, and the shale outcrop is Chang 7 shale outcrop, all of which are 6-10 mesh, and the recovery rate is over 40 mesh; 2) The results in the table are all 2 times The mean of the experimental data.

[0026] (2) Linear expansion experiment

[0027] Table 3 Experimental results of linear expansion of water-based drilling fluid s...

example 3

[0030] Example 3: The plugging performance of the drilling fluid system of the present invention was evaluated by using the simulated shale formation permeability mud cake.

[0031] Table 4 Plugging experiment results of water-based drilling fluid system with strong inhibitory nano-plugging for shale

[0032]

[0033] Note: 1) The plugging agent refers to calcium carbonate, polyalcohol, and nano-silica; 2) The results in the table are the average of the data of two experiments.

[0034] From Table 2, Table 3, and Table 4, the rolling recovery rate and linear expansion rate experiments of the shale inhibitory nano-plugging water-based drilling fluid show that the rolling recovery rate is above 98.32%, and the 16h linear expansion rate is only 22.56%. Inhibition of hydration dispersion and expansion, and when the system contains nano-silica and calcium carbonate with a certain particle size ratio, the permeability of the simulated formation is reduced by 48.59%, which greatly...

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Abstract

The invention relates to a shale strong-inhibition nano plugging water-based drilling fluid. The shale strong-inhibition nano plugging water-based drilling fluid is particularly applicable to drilling of long horizontal shale well sections with developing microfracture. The shale strong-inhibition nano plugging water-based drilling fluid is composed of, by weight part, 36-48 parts of bentonite, 1.8-2.4 parts of sodium carbonate, 6.3-8.4 parts of tackifier 80A-51, 135-180 parts of potassium polyacrylamide, 18-24 parts of filtrate reducer HDF, 0.45-0.6 part of viscosity reducer XY-270, 45-60 parts of calcium carbonate, 18-24 parts of lubricant RH-220, 45-60 parts of polymeric alcohol, 13.5-18 parts of nano silicon dioxide, 18-24 parts of potassium chloride and 900-1200 of tap water. The preparation method of the shale strong-inhibition nano plugging water-based drilling fluid comprises preparing clay basic mud; at a stirring speed of 500 r / min, adding in the tackifier and then sequentially adding in the other materials; adjusting the system pH at 10-11 and the density at 1.35 g / cm3 to obtained the shale strong-inhibition nano plugging water-based drilling fluid. The shale strong-inhibition nano plugging water-based drilling fluid is good in rheological property, capable of achieving strong-inhibition nano plugging and good in thermal stability, thereby being applicable to shale drilling.

Description

technical field [0001] The invention relates to a strong inhibitory nanometer plugging water-based drilling fluid for drilling shale, which has a strong effect of inhibiting shale clay hydration dispersion and plugging, and is especially suitable for shale long horizontal wells with micro-fractures section of drilling. Background technique [0002] During the drilling of shale gas horizontal wells, wellbore instability has always been a difficult problem for oil drilling. Due to the strong water sensitivity of shale and the development of formation fractures, how to use drilling fluid technology to inhibit the hydration expansion of mud shale clay, seal the fine, micro-nano pores and fractures of shale, prevent drilling fluid or filtrate from entering the formation, and reduce the hydration caused by hydration. Or the impact of capillary force on shale formations, preventing shale borehole wall collapse fundamentally solves the wellbore stability problem in shale drilling. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/467C09K8/487C09K8/14
CPCC09K8/14C09K8/467C09K8/487C09K2208/34
Inventor 白杨敬玉娟王平全陈婷陶鹏石晛李玉彬杨萍胡亚琴
Owner SOUTHWEST PETROLEUM UNIV
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