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A high-density water-based drilling fluid for shale gas horizontal wells

A technology for water-based drilling fluids and horizontal wells, applied in drilling compositions, chemical instruments and methods, etc., can solve the problems of difficult regulation of rheological properties, poor temperature resistance, and weak plugging properties, and achieve the Denaturation is easy to control, excellent inhibition performance, high recovery effect

Active Publication Date: 2019-01-18
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the existing water-based drilling fluid problems of weak plugging, poor inhibition, poor lubricity under high-density conditions, difficult control of rheological properties, and poor temperature resistance

Method used

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  • A high-density water-based drilling fluid for shale gas horizontal wells
  • A high-density water-based drilling fluid for shale gas horizontal wells
  • A high-density water-based drilling fluid for shale gas horizontal wells

Examples

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preparation example Construction

[0031] A method for preparing a high-density water-based drilling fluid for shale gas horizontal wells, comprising the following steps: adding a formula amount of shielding temporary plugging agent, anti-slump inhibitor, solid Lubricant, anti-mud bag cleaner, potassium chloride, sodium hydroxide, fluid loss reducer, flow regulator and barite, accumulatively high-speed stirring for 90 minutes, interrupted every 20 minutes to scrape off the slurry adhered to the cup wall , the high-density water-based drilling fluid for shale gas horizontal wells can be prepared.

[0032] Compared with oil-based drilling fluid and conventional water-based drilling fluid, the high-density water-based drilling fluid prepared by the present invention has the following outstanding advantages: 1. Excellent plugging performance and inhibition performance can meet the requirements of shale and carbonaceous mudstone on drilling Its anti-slump performance is equivalent to that of oil-based drilling fluid...

Embodiment 1

[0036]Measure 300mL tap water into a 500mL high stirring cup, add 6% shielding temporary blocking agent, 5% anti-slump inhibitor, 5% solid lubricant, 5% anti-mud bag cleaner, 25% Potassium Chloride, 0.5% Sodium Hydroxide, 3% Fluid Loss Control Agent, 0.5% Flow Pattern Regulator and 50% Barite, accumulatively stirred at high speed for 90 minutes, interrupted every 20 minutes to scrape off the adhesion on the cup wall The slurry can be used to prepare the high-density water-based drilling fluid for shale gas horizontal wells according to the present invention.

Embodiment 2

[0038] Measure 300mL tap water into a 500mL high stirring cup, add 6% shielding temporary blocking agent G314, 3% anti-slump inhibitor G319, 5% solid lubricant G338, 3% anti-mud bag while stirring with a high-speed stirrer Cleaner G318, 20% Potassium Chloride, 0.3% Sodium Hydroxide, 2.2% Fluid Loss Control Agent, 0.5% Flow Pattern Regulator XCD and 60% Barite, total high-speed stirring for 90 minutes, interrupt once every 20 minutes to scrape off sticky The slurry attached to the wall of the cup. That is, the water-based drilling fluid of the present invention is obtained.

[0039] Test 1: the test of the inhibiting performance of the prepared water-based drilling fluid according to Example 2

[0040] The density of the water-based drilling fluid prepared according to Example 2 is 2.2g / cm 3 , the inhibition performance of the high-density water-based drilling fluid was compared with other types of drilling fluid after hot rolling at 150°C for 16 hours, the results are as fol...

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Abstract

The invention provides high-density water-based drilling fluid for a shale gas horizontal well. The high-density water-based drilling fluid is prepared from, by mass, 3.0%-6.0% of temporary shielding agent, 1.0%-5.0% of inhibitory anti-collapse agent, 2%-5% of solid lubricant, 1.0%-5.0% of balling cleaner, 10%-25% of potassium chloride, 0.1%-0.5% of sodium hydroxide, 1.0%-4.0% of filtrate reducer, 0.2%-0.5% of fluid type modifier, 50%-80% of barite and the balance water. The prepared high-density water-based drilling fluid for the shale gas horizontal well still has excellent blocking and inhibiting performance under the conditions of shale and carbonaceous mudstone, still has good lubricating performance, de-filtration performance and rheological performance under the high-density high-solid-phase condition, can meet the requirements of the shale gas horizontal well, a carbonaceous mudstone horizontal well and construction of other horizontal wells on instable formation for the water-based drilling fluid, and replaces oil-based drilling liquid, and low-cost development of shale gas resources is promoted in the political and economic environment of long-term low oil price.

Description

technical field [0001] The invention relates to a drilling fluid for exploration drilling, in particular to a high-density water-based drilling fluid for shale gas horizontal well construction and a preparation method thereof. Background technique [0002] With the large-scale development of unconventional gas reservoirs marked by shale gas at home and abroad, the application of oil-based drilling fluids is becoming more and more extensive. Compared with traditional water-based drilling fluids, oil-based drilling fluids are widely used in shale gas drilling because of their good inhibitory, lubricating, and rheological properties. [0003] However, oil-based drilling fluids generally have the problems of heavy pollution, difficult disposal of oil-based drilling cuttings, and high cost of oil-based drilling fluids. Compared with oil-based drilling fluid, water-based drilling fluid has the advantages of less pollution and lower cost. Shale gas horizontal wells can use oil-ba...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/12
CPCC09K8/12C09K2208/12C09K2208/28C09K2208/34
Inventor 王京光杨斌张小平赵海峰寄晓宁丁磊王国庆吴满祥刘伟王勇强曹辉张长庚郭康赵向阳俞浩杰张雅楠涂海海
Owner BC P INC CHINA NAT PETROLEUM CORP
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