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Amphoteric potassium-based polyalcohol water-based drilling fluid for drilling shale

An amphoteric potassium-based drilling fluid technology, which is applied to drilling compositions, chemical instruments and methods, etc., can solve the problems of poor pollution resistance, low cost, high temperature gelation, etc., and achieve easy handling, low cost, and easy handling easy effect

Active Publication Date: 2015-05-06
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The advantages and disadvantages of water-based drilling fluids compared with oil-based drilling fluids are as follows: ①Environmental protection; Wellbore stability is poor; 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

Method used

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  • Amphoteric potassium-based polyalcohol water-based drilling fluid for drilling shale
  • Amphoteric potassium-based polyalcohol water-based drilling fluid for drilling shale
  • Amphoteric potassium-based polyalcohol water-based drilling fluid for drilling shale

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0013] Example 1: A preparation method of an amphoteric potassium-based polyalcohol water-based drilling fluid for drilling into shale.

[0014] First measure 1000 grams of tap water, raise the water temperature to 65°C, add 40 grams of bentonite for drilling fluid under electric stirring at a low speed of 600r / min, stir for 10 minutes and add 3 grams of Na 2 CO 3 Stir for another 30 minutes, after prehydration at normal temperature and pressure for 24 hours, add 2 grams of zwitterionic polymer coating agent FA367 under low speed 500r / min electric stirring and stir for 5 minutes, add 2 grams of zwitterionic polymer viscosity reducer XY-27 and stir 5 minutes, add 400 grams of potassium formate and stir for 5 minutes, add 50 grams of high-gloss calcium carbonate C-L501 and stir for 15 minutes, add 1 gram of calcium oxide and stir for 15 minutes, add 30 grams of drilling fluid and use polyalcohol lubricant JHJC-3 and stir for 5 minutes; add 30 grams of drilling fluid The liquid ...

example 2

[0015] 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.

[0016] Table 2 Experimental results of the rolling recovery rate of the amphoteric potassium-based polyalcohol water-based drilling fluid

[0017] Drilling Fluid Formula

Experimental conditions

Recovery mass (g)

Recovery rate(%)

Clear water + 50g red bed soil

100℃ / 16h

5.64

11.28

Low-density water-based drilling fluid system + 50g red bed soil

100℃ / 16h

46.23

92.46

[0018] Note: The red bed soil is Sichuan red bed soil debris

[0019] Table 3 Experimental results of the linear expansion of the amphoteric potassium-based polyalcohol water-based drilling fluid

[0020]

[0021] From Table 2 and Table 3, the rolling recovery rate and linear expansion rate experiments of the amphoteric potassium-based polyalcohol water-based drilling fluid show that the ...

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Abstract

The invention relates to an amphoteric potassium-based polyalcohol water-based drilling fluid for drilling shale, which overcomes a problem that a well wall is unstable when a water-based drilling fluid drills into a shale ground layer, restrains the shale ground layer from being hydrated and collapsed, and effectively seals shale micro-nano apertures. According to the technical scheme adopted by the invention, the drilling liquid is prepared from the following raw material components by mass (unit: g): 900-1000 g of tap water, 40-60 g of bentonite, 1-3 g of Na2CO3, 2-4 g of an amphoteric ionic polymer coating agent FA367, 1-2 g of an amphoteric ionic polymer viscosity reducer XY-27, 300-400 g of potassium formate, 50-60 g of highlight calcium carbonate C-L501, 0.5-1 g of calcium oxide, 30-40 g of a lubricating agent JHJC-3, 20-30 g of paraffin emulsion JHNP, 10-20 g of polyalcohol JHGC; and 40% alkaline liquor is prepared by NaOH, the pH of the system is regulated to be 9, and the system is uniformly stirred to prepare the amphoteric potassium-based polyalcohol water-based drilling fluid. The water-based drilling fluid is low in cost, good in inhibition performance and used for drilling a shale long horizontal section with microfracture development.

Description

technical field [0001] The invention relates to an amphoteric potassium-based polyalcohol water-based drilling fluid used for drilling shale during shale gas development and drilling, and is particularly suitable for drilling long horizontal well sections of shale with micro-fractures. Background technique [0002] At present, oil-based drilling fluids are commonly used in shale gas wells at home and abroad. Because oil-based drilling fluids can increase the capillary pressure of water-wet shale and prevent drilling fluids from invading shale, oil-based drilling fluids and synthetic-based drilling fluids can be used. Effectively solve the problem of well wall instability. In dealing with the wellbore stability of shale gas horizontal wells, the use of oil-based drilling fluid system is currently the most effective measure abroad. But even if oil-based drilling fluid is used, for shale formations with developed fractures or beddings, it is necessary to strengthen the pluggin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/24
CPCC09K8/24C09K2208/10C09K2208/34
Inventor 白杨王平全王波杜敬国时海涛余冰洋
Owner SOUTHWEST PETROLEUM UNIV
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