Water-based drilling fluid suitable for shale gas development

A water-based drilling fluid and shale gas technology, which is applied in the field of drilling fluids, can solve the problems that the oil-based drilling fluid cannot reach the same level, the water-based drilling fluid system has a high lubrication coefficient, and cannot meet the requirements of shale gas development and drilling. Achieve the effect of improving suspension stability, improving shale stability, and improving lubricating performance

Inactive Publication Date: 2016-01-20
SINOPEC JIANGHAN OILFIELD SERVICE CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The above water-based drilling fluid systems all have certain shortcomings and deficiencies: ① only consider the wellbore stability of shale from the perspective of inhibitors, which is not targeted; ② the high-temperature and high-pressure filtration of the water-based drilling flui

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0038] Example 1:

[0039] A comparative example is prepared from the following components (based on water in percentage by volume)

[0040] Fresh water+4% sulfonated tall oil+3% polyamine+2% sulfonated asphalt+3% shale plugging agent+3% nano plugging agent+2% hydroxypropyl starch+2 % Nano fumed silica + 0.2% cutting agent + 0.3% sodium hydroxide + 80% barite, ρ=1.50g / cm 3

Example Embodiment

[0041] Example 2:

[0042] A comparative example is prepared from the following components (based on water in percentage by volume)

[0043] Fresh water + 4% polyoxypropylene fatty acid ester + 3% polyquaternary ammonium salt + 2% oxidized asphalt + 3% shale plugging agent + 3% nano plugging agent + 1% sulfonated starch + 3% sodium silicate+0.1% xanthan gum+0.3% potassium hydroxide+130% barite, ρ=1.8g / cm 3

Example Embodiment

[0044] Example 3:

[0045] A comparative example is prepared from the following components (based on water in percentage by volume)

[0046] Fresh water + 5% alkyl benzene sulfonamide + 3% amino polyol + 3% natural asphalt + 3% shale plugging agent + 4% nano plugging agent + 1% low viscosity polyanion Cellulose + 1% sodium aluminate + 0.1% guar gum + 0.3% potassium carbonate + 150% iron ore powder, ρ=2.2g / cm 3 .

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PUM

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Abstract

The invention provides a water-based drilling fluid suitable for shale gas development. The water-based drilling fluid is prepared from the following raw materials in volume on the basis of water: 100 percent of water, 2 to 6 percent of lubricating agents, 1 to 5 percent of inhibitors, 1 to 5 percent of blocking anti-collapse agents, 1 to 5 percent of shale blocking agents, 1 to 5 percent of nanometer blocking agents, 1 to 3 percent of fluid loss additives, 1 to 3 percent of additives, 0 to 0.4 percent of shearing potentiator, 0.1 to 0.6 percent of pH regulator and 0 to 300 percent of weighting agents. The water-based drilling fluid has low filter loss, shale cracks can be effectively blocked, and the stability of a well wall is increased; the lubricating performance is good, and the problems of friction and torque caused by a shale gas horizontal well are preferably solved; the rheological property is excellent.

Description

technical field [0001] The invention relates to a drilling fluid used in the field of petroleum drilling engineering, in particular to a water-based drilling fluid suitable for shale gas development and drilling. Background technique [0002] The exploration and development of shale gas has gradually emerged in China, forming a certain scale of exploration and development, and entering a stage of rapid development. At present, the common drilling fluid is oil-based drilling fluid. Oil-based drilling fluid has excellent shale stability and lubricating properties, and has strong pollution resistance and can be recycled. It has become an essential key technology for shale gas development. . However, the disadvantages of high cost and environmental protection of oil-based drilling fluid are also particularly prominent. Therefore, it is particularly important to study a set of water-based drilling fluid system suitable for shale gas drilling in combination with the geological ch...

Claims

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Application Information

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IPC IPC(8): C09K8/12
CPCC09K8/12C09K8/514C09K2208/18C09K2208/34
Inventor 杨国圣游云武许明标由福昌
Owner SINOPEC JIANGHAN OILFIELD SERVICE CORP
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