Novel environment-friendly slickwater for shale gas
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A technology for slick water and shale gas, which is applied in the field of new environmentally friendly slick water for shale gas, can solve the problems of matrix permeability damage, environmental pollution, and support fracture conductivity damage, etc., and achieves high conductivity and small damage. Effect
Inactive Publication Date: 2015-05-20
AOFEI BEIJING PETROLEUM TECH
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Problems solved by technology
[0002] In the process of exploration and development of unconventional oil and gas reservoirs, due to the low porosity and low permeability characteristics of the reservoirs, most unconventional oil and gas reservoirs need to implement hydraulic fracturing to achieve industrial production value, but a large number of fracturing fluid damage proves that Conventional polymer fracturing fluid system damages the permeability of the matrix by more than 30%, seriously affecting the stimulation effect of fracturing; an
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Embodiment 1
[0019] A kind of shale gas novel environment-friendly slick water preparation method, according to weight percentage, proportioning is as follows:
[0020] Drag reducing agent 0.05%;
[0021] Drainage aid 0.1%;
[0022] Fungicide 0.2%;
[0023] Clay stabilizer 0.5%;
[0024] The balance is clear water.
[0025] The shale gas new-type environmentally friendly slick water of this embodiment is obtained by adding drag reducing agent, drainage aid, bactericide, clay stabilizer and clear water into the container according to the weight percentage of the above ingredients, and mixing and stirring to a uniform state.
Embodiment 2
[0026] Embodiment 2: As described in embodiment 1, the difference is the composition of slick water.
[0027] According to weight percentage, proportioning is as follows:
[0028] Drag reducing agent 0.08%;
[0029] Drainage aid 0.2%;
[0030] Fungicide 0.3%;
[0031] Clay stabilizer 0.9%; the balance is clear water.
Embodiment 3
[0032] Embodiment 3: As described in embodiment 1, the difference is the composition of slick water.
[0033] According to weight percentage, proportioning is as follows:
[0034] Drag reducing agent 0.12%;
[0035] Drainage aid 0.2%;
[0036] Fungicide 0.4%;
[0037] Clay stabilizer 1.3%; the balance is clear water.
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Abstract
The invention discloses a novel environment-friendly slickwater for shale gas. The slickwater comprises the following components in percentage by weight: 0.05%-0.15% of a resistance-reducing agent, 0.1%-0.3% of a discharge aiding agent, 0.2%-0.5% of a bactericide, 0.5%-1.5% of a clay stabilizer and the balance of clear water, wherein the resistance-reducing agent is a polyacrylamide emulsion; the discharge aiding agent is a mixture of cetyl trimethyl ammonium chloride and fatty alcohol; the bactericide is a mixture of sodium chloride and acrolein; and the clay stabilizer is potassium chloride. The slickwater is small harm to unconventional reservoir, clean, environment friendly and free of pollution and has higher proppant fracture conductivity so that longer effective fractures can be produced; and for unconventional oil and gas fields, the slickwater fracturing is an important measure to exploit the oil and gas fields and is also an effective way to reduce the oil production cost and increase mining-employed reserves.
Description
technical field [0001] The invention relates to the technical field of unconventional oil and gas field exploitation, in particular to a new type of environmentally friendly slippery water for shale gas. Background technique [0002] In the process of exploration and development of unconventional oil and gas reservoirs, due to the low porosity and low permeability characteristics of the reservoirs, most unconventional oil and gas reservoirs need to implement hydraulic fracturing to achieve industrial production value, but a large number of fracturing fluid damage proves that Conventional polymer fracturing fluid system damages the matrix permeability by more than 30%, which seriously affects the stimulation effect of fracturing; and also causes great damage to underground reservoirs. As the fracturing fluid leaks out, the cross-linking fluid is concentrated many times in the proppant-filled fractures. If the concentrated cross-linked polymer does not degrade after constructi...
Claims
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Application Information
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