CN103573244A - Method for fracturing guanidine gum in coal bed gas development based on low-temperature gum breaking - Google Patents
Method for fracturing guanidine gum in coal bed gas development based on low-temperature gum breaking Download PDFInfo
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- CN103573244A CN103573244A CN201310512525.9A CN201310512525A CN103573244A CN 103573244 A CN103573244 A CN 103573244A CN 201310512525 A CN201310512525 A CN 201310512525A CN 103573244 A CN103573244 A CN 103573244A
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Abstract
The invention relates to a method for fracturing guanidine gum in coal bed gas development based on low-temperature gum breaking, belongs to a method suitable for coal bed gas yield increment mining of low-permeability soft coal bed, and mainly solves the technical problems of low gas yield and poor flow conductivity of a conventional coal bed gas mining method. According to the technical scheme, the method comprises the following steps: 1) injecting a drilled gas bleeding well with a pre-ahead fluid-active water through a pump to enable coal bed to generate cracks, wherein the filling pressure is higher than the coal bed fracturing pressure; 2) injecting a sand-carrying fluid; 3) injecting a displacement fluid; 4) stopping the pump for more than 10 minutes, and measuring coal bed pressure drop; 5) injecting a gum breaking agent; 6) filling a displacement fluid. The method has the advantages of long and wide producing gaps, good flow conductivity and high gas yield.
Description
Technical field
The present invention relates to a kind of method that in cbm development based under the broken glue of low temperature, guanidine glue laminated is split, it belongs to a kind of coal-bed-gas production-increase exploitation method that is applicable to hyposmosis soft seam.
Background technology
Coal bed gas, Main Ingredients and Appearance is methane (CH
4), be and a kind of clean energy resource gas of coal association, wherein 90% left and right is to be adsorbed in matrix of coal with adsorbed state, 10% left and right is free between crack with free state.China's coal bed gas resource amount approximately 36.8 trillion m
3, occupy third place in the world, suitable with China's natural gas reserves.It is develop and useedd making up the deficiency of China's conventional energy resource, fundamentally eliminate the disasters such as the gas explosion that causes in coal production, Gas Outburst, reduce the environment pollution that a large amount of drawing-off gas cause and the energy resource structure of improving China, accelerating China, to take coal be that main energy resource system is gradually to the conversion process of the mode of sustainable development of environmentally friendlyization, form the new industry of clear energy sources, all there is important strategic importance.
China is not only coal resources big country, and coal bed gas resource is also extremely abundant, but up to now, the total experiment situation from the whole nation, and most coalbed gas loggings yield poorly, production decline is fast, are difficult to form stable industrialness source of the gas.Its main cause is that the general permeability in China coal seam reset pressure low, that exploit shallow coal bed gas is not high, desorption rate is slow, makes coal bed gas desorb and the migration in coal seam thereof very difficult.Abroad cbm development facts have proved, pressure break, gas injection and slot are three key links in Coal-bed gas stimulation technology.Adopt at present pressure break to improve the mode of permeability, often after pressure break, initial gas production increases to some extent, but the just decay of very fast gas production, therefore simple pressure break has some limitations improving the output of coal bed gas.
Pressure break is the Main Yield-increasing method in hyposmosis, extra-low permeability oil, gas field, is also the main method of cbm development, and wherein main employing is that riverfrac treatment and guanidine glue laminated are split.But China's overwhelming majority coal seam " three is low " situation in low-permeability, low reservoir pressure, low saturation, and ature of coal is softer, belong to soft seam, coal seam temperature lower (generally at 10～20 ℃), adopt traditional guanidine glue laminated to split can to exist fracturing liquid rubber-breaking not in time, not thorough, particularly fracturing fluid injection pressure is greater than coal seam pressure, fracturing fluid leak, guanidine glue forms filter cake in fracture faces, can reduce the problem of flow conductivity.
Summary of the invention
The object of the invention is to solve the low and poor technical problem of flow conductivity of gas production that the method for existing exploiting coal bed methane exists, a kind of method that in the cbm development based under the broken glue of low temperature that seam is long, flow conductivity is strong and gas production is high, guanidine glue laminated is split of making is provided.
For solving the problems of the technologies described above, the technical solution used in the present invention is:
The method that in cbm development under the broken glue of low temperature, guanidine glue laminated is split, it comprises the following steps:
1) injecting pre-prepad fluid, is active water Injection Well under by pump by pre-prepad fluid to the extraction well that completes drilling well, makes generation crack, coal seam, injection pressure ﹥ coal seam fracture pressure, and it is 0.5m that pre-prepad fluid injects discharge capacity
3/ min～10m
3/ min, pre-prepad fluid injection rate is 5m
3～500m
3;
2) inject load fluid, the average sand ratio of load fluid is more than 10%, and it is 0.5m that load fluid injects discharge capacity
3/ min～10m
3/ min, load fluid injection rate 5m
3～500m
3;
3) inject displacement fluid, described displacement fluid is active water, and it is 0.5m that active water injects discharge capacity
3/ min～10m
3/ min, active water injection rate 5m
3～500m
3;
4) termination of pumping, surveys coal seam pressure drop, and the termination of pumping time is more than 10min;
5) inject gel breaker, it is 0.5m that gel breaker injects discharge capacity
3/ min～10m
3/ min, gel breaker injection rate 5m
3～500m
3;
6) inject displacement fluid, it is 0.5m that displacement fluid injects discharge capacity
3/ min～10m
3/ min, displacement fluid injection rate 5m
3～500m
3.
Another breaks based on low temperature the method that in the cbm development under glue, guanidine glue laminated is split the present invention, and it comprises the following steps:
1) injecting pre-prepad fluid, is active water Injection Well under by pump by pre-prepad fluid to the extraction well that completes drilling well, makes generation crack, coal seam, injection pressure ﹥ coal seam fracture pressure, and it is 0.5m that pre-prepad fluid injects discharge capacity
3/ min～10m
3/ min, pre-prepad fluid injection rate is 5m
3～500m
3;
2) inject prepad fluid, described prepad fluid is viscous liquid, and the viscosity of viscous liquid is 5～500mPa.s, and it is 0.5m that viscous liquid injects discharge capacity
3/ min～10m
3/ min, viscous liquid injection rate 1m
3～500m
3;
3) inject load fluid, the average sand ratio of load fluid is more than 10%, and it is 0.5m that load fluid injects discharge capacity
3/ min～10m
3/ min, load fluid injection rate 5m
3～500m
3;
4) inject displacement fluid, described displacement fluid is active water, and it is 0.5m that active water injects discharge capacity
3/ min～10m
3/ min, active water injection rate 5m
3～500m
3;
5) termination of pumping, surveys coal seam pressure drop, and the termination of pumping time is more than 10min;
6) inject gel breaker, it is 0.5m that gel breaker injects discharge capacity
3/ min～10m
3/ min, gel breaker injection rate 5m
3～500m
3;
7) inject displacement fluid, it is 0.5m that displacement fluid injects discharge capacity
3/ min～10m
3/ min, displacement fluid injection rate 5m
3～500m
3.
Another breaks based on low temperature the method that in the cbm development under glue, guanidine glue laminated is split the present invention, and it comprises the following steps:
1) inject prepad fluid, to the extraction well that completes drilling well by pump by under prepad fluid Injection Well, make generation crack, coal seam, injection pressure ﹥ coal seam fracture pressure, described prepad fluid is viscous liquid, and the viscosity of viscous liquid is 5～500mPa.s, and it is 0.5m that viscous liquid injects discharge capacity
3/ min～10m
3/ min, viscous liquid injection rate 1m
3～500m
3;
2) inject gel breaker, it is 0.5m that gel breaker injects discharge capacity
3/ min～10m
3/ min, gel breaker injection rate 1m
3～500m
3;
3) inject insulating liquid, described insulating liquid is active water, and it is 0.5m that insulating liquid injects discharge capacity
3/ min～10m
3/ min, insulating liquid injection rate 0.5m
3～500m
3;
4) inject load fluid, the average sand ratio of load fluid is more than 10%, and it is 0.5m that load fluid injects discharge capacity
3/ min～10m
3/ min, load fluid injection rate 5m
3～500m
3;
5) inject displacement fluid, described displacement fluid is active water, and it is 0.5m that active water injects discharge capacity
3/ min～10m
3/ min, active water injection rate 5m
3～500m
3;
6) termination of pumping, surveys coal seam pressure drop, and the termination of pumping time is more than 10min;
7) inject gel breaker, it is 0.5m that gel breaker injects discharge capacity
3/ min～10m
3/ min, gel breaker injection rate 5m
3～500m
3;
8) inject displacement fluid, it is 0.5m that displacement fluid injects discharge capacity
3/ min～10m
3/ min, displacement fluid injection rate 5m
3～500m
3.
Another breaks based on low temperature the method that in the cbm development under glue, guanidine glue laminated is split again in the present invention, and it comprises the following steps:
1) inject prepad fluid, to the extraction well that completes drilling well by pump by under prepad fluid Injection Well, make generation crack, coal seam, injection pressure ﹥ coal seam fracture pressure, described prepad fluid is viscous liquid, and the viscosity of viscous liquid is 5～500mPa.s, and it is 0.5m that viscous liquid injects discharge capacity
3/ min～10m
3/ min, viscous liquid injection rate 1m
3～500m
3;
2) inject load fluid, the average sand ratio of load fluid is more than 10%, and it is 0.5m that load fluid injects discharge capacity
3/ min～10m
3/ min, load fluid injection rate 5m
3～500m
3;
3) inject displacement fluid, described displacement fluid is active water, and it is 0.5m that active water injects discharge capacity
3/ min～10m
3/ min, active water injection rate 5m
3～500m
3;
4) termination of pumping, surveys coal seam pressure drop, and the termination of pumping time is more than 10min;
5) inject gel breaker, it is 0.5m that gel breaker injects discharge capacity
3/ min～10m
3/ min, HRS gel breaker injection rate 5m
3～500m
3;
6) inject displacement fluid, it is 0.5m that displacement fluid injects discharge capacity
3/ min～10m
3/ min, displacement fluid injection rate 5m
3～500m
3.
Described gel breaker is any one in oxidants product or acidification of oil field series products.
Because the present invention has adopted technique scheme, solved the low and poor technical problem of flow conductivity of gas production that existing exploitation method exists, therefore, compare with background technology, the present invention have advantages of make seam long, make that seam is wide, flow conductivity is strong and gas production is high.
The specific embodiment
Embodiment 1
The method that in a kind of cbm development based under the broken glue of low temperature in the present embodiment, guanidine glue laminated is split, it comprises the following steps:
1) injecting pre-prepad fluid, is active water Injection Well under by pump by pre-prepad fluid to the extraction well that completes drilling well, makes generation crack, coal seam, injection pressure ﹥ coal seam fracture pressure, and it is 0.5m that pre-prepad fluid injects discharge capacity
3/ min, pre-prepad fluid injection rate is 5m
3;
2) inject load fluid, the average sand ratio of load fluid is more than 10%, and it is 0.5m that load fluid injects discharge capacity
3/ min, load fluid injection rate 5m
3;
3) inject displacement fluid, described displacement fluid is active water, and it is 0.5m that active water injects discharge capacity
3/ min, active water injection rate 5m
3;
4) termination of pumping, surveys coal seam pressure drop, and the termination of pumping time is more than 10min;
5) inject gel breaker, described gel breaker is oxidants product, and it is 0.5m that gel breaker injects discharge capacity
3/ min, gel breaker injection rate 5m
3;
6) inject displacement fluid, it is 0.5m that displacement fluid injects discharge capacity
3/ min, displacement fluid injection rate 5m
3.
Embodiment 2
The method that in a kind of cbm development based under the broken glue of low temperature in the present embodiment, guanidine glue laminated is split, it comprises the following steps:
1) injecting pre-prepad fluid, is active water Injection Well under by pump by pre-prepad fluid to the extraction well that completes drilling well, makes generation crack, coal seam, injection pressure ﹥ coal seam fracture pressure, and it is 10m that pre-prepad fluid injects discharge capacity
3/ min, pre-prepad fluid injection rate is 500m
3;
2) inject load fluid, the average sand ratio of load fluid is more than 10%, and it is 10m that load fluid injects discharge capacity
3/ min, load fluid injection rate 500m
3;
3) inject displacement fluid, described displacement fluid is active water, and it is 10m that active water injects discharge capacity
3/ min, active water injection rate 500m
3;
4) termination of pumping, surveys coal seam pressure drop, and the termination of pumping time is more than 10min;
5) inject gel breaker, described gel breaker is oxidants product, and it is 10m that gel breaker injects discharge capacity
3/ min, gel breaker injection rate 500m
3;
6) inject displacement fluid, it is 10m that displacement fluid injects discharge capacity
3/ min, displacement fluid injection rate 500m
3.
Embodiment 3
The method that in a kind of cbm development based under the broken glue of low temperature in the present embodiment, guanidine glue laminated is split, it comprises the following steps:
1) injecting pre-prepad fluid, is active water Injection Well under by pump by pre-prepad fluid to the extraction well that completes drilling well, makes generation crack, coal seam, injection pressure ﹥ coal seam fracture pressure, and it is 5m that pre-prepad fluid injects discharge capacity
3/ min, pre-prepad fluid injection rate is 150m
3;
2) inject load fluid, the average sand ratio of load fluid is more than 10%, and it is 4m that load fluid injects discharge capacity
3/ min, load fluid injection rate 48m
3;
3) inject displacement fluid, described displacement fluid is active water, and it is 4m that active water injects discharge capacity
3/ min, active water injection rate 8m
3;
4) termination of pumping, surveys coal seam pressure drop, and the termination of pumping time is more than 10min;
5) inject gel breaker, described gel breaker is oxidants product, and it is 5m that gel breaker injects discharge capacity
3/ min, gel breaker injection rate 100m
3;
6) inject displacement fluid, it is 4m that displacement fluid injects discharge capacity
3/ min, displacement fluid injection rate 32m
3.
Embodiment 4
The method that in a kind of cbm development based under the broken glue of low temperature in the present embodiment, guanidine glue laminated is split, it comprises the following steps:
1) injecting pre-prepad fluid, is active water Injection Well under by pump by pre-prepad fluid to the extraction well that completes drilling well, makes generation crack, coal seam, injection pressure ﹥ coal seam fracture pressure, and it is 0.5m that pre-prepad fluid injects discharge capacity
3/ min, pre-prepad fluid injection rate is 5m
3;
2) inject prepad fluid, described prepad fluid is viscous liquid, and the viscosity of viscous liquid is 5～500mPa.s, and it is 0.5m that viscous liquid injects discharge capacity
3/ min, viscous liquid injection rate 1m
3;
3) inject load fluid, the average sand ratio of load fluid is more than 10%, and it is 0.5m that load fluid injects discharge capacity
3/ min, load fluid injection rate 5m
3;
4) inject displacement fluid, described displacement fluid is active water, and it is 0.5m that active water injects discharge capacity
3/ min, active water injection rate 5m
3;
5) termination of pumping, surveys coal seam pressure drop, and the termination of pumping time is more than 10min;
6) inject gel breaker, described gel breaker is oxidants product, and it is 0.5m that gel breaker injects discharge capacity
3/ min, gel breaker injection rate 5m
3;
7) inject displacement fluid, it is 0.5m that displacement fluid injects discharge capacity
3/ min, displacement fluid injection rate 5m
3.
Embodiment 5
The method that in a kind of cbm development based under the broken glue of low temperature in the present embodiment, guanidine glue laminated is split, it comprises the following steps:
1) injecting pre-prepad fluid, is active water Injection Well under by pump by pre-prepad fluid to the extraction well that completes drilling well, makes generation crack, coal seam, injection pressure ﹥ coal seam fracture pressure, and it is 10m that pre-prepad fluid injects discharge capacity
3/ min, pre-prepad fluid injection rate is 500m
3;
2) inject prepad fluid, described prepad fluid is viscous liquid, and the viscosity of viscous liquid is 5～500mPa.s, and it is 10m that viscous liquid injects discharge capacity
3/ min, viscous liquid injection rate 500m
3;
3) inject load fluid, the average sand ratio of load fluid is more than 10%, and it is 10m that load fluid injects discharge capacity
3/ min, load fluid injection rate 500m
3;
4) inject displacement fluid, described displacement fluid is active water, and it is 10m that active water injects discharge capacity
3/ min, active water injection rate 500m
3;
5) termination of pumping, surveys coal seam pressure drop, and the termination of pumping time is more than 10min;
6) inject gel breaker, described gel breaker is oxidants product, and it is 10m that gel breaker injects discharge capacity
3/ min, gel breaker injection rate 500m
3;
7) inject displacement fluid, it is 10m that displacement fluid injects discharge capacity
3/ min, displacement fluid injection rate 500m
3.
Embodiment 6
The method that in a kind of cbm development based under the broken glue of low temperature in the present embodiment, guanidine glue laminated is split, it comprises the following steps:
1) injecting pre-prepad fluid, is active water Injection Well under by pump by pre-prepad fluid to the extraction well that completes drilling well, makes generation crack, coal seam, injection pressure ﹥ coal seam fracture pressure, and it is 5m that pre-prepad fluid injects discharge capacity
3/ min, pre-prepad fluid injection rate is 150m
3;
2) inject prepad fluid, described prepad fluid is viscous liquid, and the viscosity of viscous liquid is 5～500mPa.s, and it is 4m that viscous liquid injects discharge capacity
3/ min, viscous liquid injection rate 40m
3;
3) inject load fluid, the average sand ratio of load fluid is more than 10%, and it is 4m that load fluid injects discharge capacity
3/ min, load fluid injection rate 44m
3;
4) inject displacement fluid, described displacement fluid is active water, and it is 4m that active water injects discharge capacity
3/ min, active water injection rate 10m
3;
5) termination of pumping, surveys coal seam pressure drop, and the termination of pumping time is more than 10min;
6) inject gel breaker, described gel breaker is oxidants product, and it is 5m that gel breaker injects discharge capacity
3/ min, gel breaker injection rate 110m
3;
7) inject displacement fluid, it is 4m that displacement fluid injects discharge capacity
3/ min, displacement fluid injection rate 36m
3.
Embodiment 7
The method that in a kind of cbm development based under the broken glue of low temperature in the present embodiment, guanidine glue laminated is split, it comprises the following steps:
1) inject prepad fluid, to the extraction well that completes drilling well by pump by under prepad fluid Injection Well, make generation crack, coal seam, injection pressure ﹥ coal seam fracture pressure, described prepad fluid is viscous liquid, and the viscosity of viscous liquid is 5～500mPa.s, and it is 0.5m that viscous liquid injects discharge capacity
3/ min, viscous liquid injection rate 1m
3;
2) inject gel breaker, described gel breaker is oxidants product, and it is 0.5m that gel breaker injects discharge capacity
3/ min, gel breaker injection rate 1m
3;
3) inject insulating liquid, described insulating liquid is active water, and it is 0.5m that insulating liquid injects discharge capacity
3/ min, insulating liquid injection rate 0.5m
3;
4) inject load fluid, the average sand ratio of load fluid is more than 10%, and it is 0.5m that load fluid injects discharge capacity
3/ min, load fluid injection rate 5m
3;
5) inject displacement fluid, described displacement fluid is active water, and it is 0.5m that active water injects discharge capacity
3/ min, active water injection rate 5m
3;
6) termination of pumping, surveys coal seam pressure drop, and the termination of pumping time is more than 10min;
7) inject gel breaker, described gel breaker is oxidants product, and it is 0.5m that gel breaker injects discharge capacity
3/ min, gel breaker injection rate 5m
3;
8) inject displacement fluid, it is 0.5m that displacement fluid injects discharge capacity
3/ min, displacement fluid injection rate 5m
3.
Embodiment 8
The method that in a kind of cbm development based under the broken glue of low temperature in the present embodiment, guanidine glue laminated is split, it comprises the following steps:
1) inject prepad fluid, to the extraction well that completes drilling well by pump by under prepad fluid Injection Well, make generation crack, coal seam, injection pressure ﹥ coal seam fracture pressure, described prepad fluid is viscous liquid, and the viscosity of viscous liquid is 5～500mPa.s, and it is 10m that viscous liquid injects discharge capacity
3/ min, viscous liquid injection rate 500m
3;
2) inject gel breaker, described gel breaker is oxidants product, and it is 10m that gel breaker injects discharge capacity
3/ min, gel breaker injection rate 500m
3;
3) inject insulating liquid, described insulating liquid is active water, and it is 10m that insulating liquid injects discharge capacity
3/ min, insulating liquid injection rate 500m
3;
4) inject load fluid, the average sand ratio of load fluid is more than 10%, and it is 10m that load fluid injects discharge capacity
3/ min, load fluid injection rate 500m
3;
5) inject displacement fluid, described displacement fluid is active water, and it is 10m that active water injects discharge capacity
3/ min, active water injection rate 500m
3;
6) termination of pumping, surveys coal seam pressure drop, and the termination of pumping time is more than 10min;
7) inject gel breaker, described gel breaker is oxidants product, and it is 10m that gel breaker injects discharge capacity
3/ min, gel breaker injection rate 500m
3;
8) inject displacement fluid, it is 10m that displacement fluid injects discharge capacity
3/ min, displacement fluid injection rate 500m
3.
Embodiment 9
The method that in a kind of cbm development based under the broken glue of low temperature in the present embodiment, guanidine glue laminated is split, it comprises the following steps:
1) inject prepad fluid, to the extraction well that completes drilling well by pump by under prepad fluid Injection Well, make generation crack, coal seam, injection pressure ﹥ coal seam fracture pressure, described prepad fluid is viscous liquid, and the viscosity of viscous liquid is 5～500mPa.s, and it is 4m that viscous liquid injects discharge capacity
3/ min, viscous liquid injection rate 48m
3;
2) inject gel breaker, described gel breaker is oxidants product, and it is 5m that gel breaker injects discharge capacity
3/ min, gel breaker injection rate 110m
3;
3) inject insulating liquid, described insulating liquid is active water, and it is 5m that insulating liquid injects discharge capacity
3/ min, insulating liquid injection rate 50m
3;
4) inject load fluid, the average sand ratio of load fluid is more than 10%, and it is 4m that load fluid injects discharge capacity
3/ min, load fluid injection rate 44m
3;
5) inject displacement fluid, described displacement fluid is active water, and it is 4m that active water injects discharge capacity
3/ min, active water injection rate 10m
3;
6) termination of pumping, surveys coal seam pressure drop, and the termination of pumping time is more than 10min;
7) inject gel breaker, described gel breaker is oxidants product, and it is 5m that gel breaker injects discharge capacity
3/ min, gel breaker injection rate 115m
3;
8) inject displacement fluid, it is 4m that displacement fluid injects discharge capacity
3/ min, displacement fluid injection rate 40m
3.
Embodiment 10
The method that in a kind of cbm development based under the broken glue of low temperature in the present embodiment, guanidine glue laminated is split, it comprises the following steps:
1) inject prepad fluid, to the extraction well that completes drilling well by pump by under prepad fluid Injection Well, make generation crack, coal seam, injection pressure ﹥ coal seam fracture pressure, described prepad fluid is viscous liquid, and the viscosity of viscous liquid is 5～500mPa.s, and it is 0.5m that viscous liquid injects discharge capacity
3/ min, viscous liquid injection rate 1m
3;
2) inject load fluid, the average sand ratio of load fluid is more than 10%, and it is 0.5m that load fluid injects discharge capacity
3/ min, load fluid injection rate 5m
3;
3) inject displacement fluid, described displacement fluid is active water, and it is 0.5m that active water injects discharge capacity
3/ min, active water injection rate 5m
3;
4) termination of pumping, surveys coal seam pressure drop, and the termination of pumping time is more than 10min;
5) inject gel breaker, described gel breaker is oxidants product, and it is 0.5m that gel breaker injects discharge capacity
3/ min, gel breaker injection rate 5m
3;
6) inject displacement fluid, it is 0.5m that displacement fluid injects discharge capacity
3/ min, displacement fluid injection rate 5m
3.
Embodiment 11
The method that in a kind of cbm development based under the broken glue of low temperature in the present embodiment, guanidine glue laminated is split, it comprises the following steps:
1) inject prepad fluid, to the extraction well that completes drilling well by pump by under prepad fluid Injection Well, make generation crack, coal seam, injection pressure ﹥ coal seam fracture pressure, described prepad fluid is viscous liquid, and the viscosity of viscous liquid is 5～500mPa.s, and it is 10m that viscous liquid injects discharge capacity
3/ min, viscous liquid injection rate 500m
3;
2) inject load fluid, the average sand ratio of load fluid is more than 10%, and it is 10m that load fluid injects discharge capacity
3/ min, load fluid injection rate 500m
3;
3) inject displacement fluid, described displacement fluid is active water, and it is 10m that active water injects discharge capacity
3/ min, active water injection rate 500m
3;
4) termination of pumping, surveys coal seam pressure drop, and the termination of pumping time is more than 10min;
5) inject gel breaker, described gel breaker is oxidants product, and it is 10m that gel breaker injects discharge capacity
3/ min, gel breaker injection rate 500m
3;
6) inject displacement fluid, it is 10m that displacement fluid injects discharge capacity
3/ min, displacement fluid injection rate 500m
3.
Embodiment 12
The method that in a kind of cbm development based under the broken glue of low temperature in the present embodiment, guanidine glue laminated is split, it comprises the following steps:
1) inject prepad fluid, to the extraction well that completes drilling well by pump by under prepad fluid Injection Well, make generation crack, coal seam, injection pressure ﹥ coal seam fracture pressure, described prepad fluid is viscous liquid, and the viscosity of viscous liquid is 5～500mPa.s, and it is 4m that viscous liquid injects discharge capacity
3/ min, viscous liquid injection rate 44m
3;
2) inject load fluid, the average sand ratio of load fluid is more than 10%, and it is 4m that load fluid injects discharge capacity
3/ min, load fluid injection rate 56m
3;
3) inject displacement fluid, described displacement fluid is active water, and it is 4m that active water injects discharge capacity
3/ min, active water injection rate 12m
3;
4) termination of pumping, surveys coal seam pressure drop, and the termination of pumping time is more than 10min;
5) inject gel breaker, described gel breaker is oxidants product, and it is 5m that gel breaker injects discharge capacity
3/ min, gel breaker injection rate 120m
3;
6) inject displacement fluid, it is 4m that displacement fluid injects discharge capacity
3/ min, displacement fluid injection rate 32m
3.
Gel breaker in above-described embodiment is that oxidants product can also replace with acidification of oil field series products.
Claims (5)
1. the method that in the cbm development based under the broken glue of low temperature, guanidine glue laminated is split, is characterized in that: it comprises the following steps:
1) injecting pre-prepad fluid, is active water Injection Well under by pump by pre-prepad fluid to the extraction well that completes drilling well, makes generation crack, coal seam, injection pressure ﹥ coal seam fracture pressure, and it is 0.5m that pre-prepad fluid injects discharge capacity
3/ min～10m
3/ min, pre-prepad fluid injection rate is 5m
3～500m
3;
2) inject load fluid, the average sand ratio of load fluid is more than 10%, and it is 0.5m that load fluid injects discharge capacity
3/ min～10m
3/ min, load fluid injection rate 5m
3～500m
3;
3) inject displacement fluid, described displacement fluid is active water, and it is 0.5m that active water injects discharge capacity
3/ min～10m
3/ min, active water injection rate 5m
3～500m
3;
4) termination of pumping, surveys coal seam pressure drop, and the termination of pumping time is more than 10min;
5) inject gel breaker, it is 0.5m that gel breaker injects discharge capacity
3/ min～10m
3/ min, gel breaker injection rate 5m
3～500m
3;
6) inject displacement fluid, it is 0.5m that displacement fluid injects discharge capacity
3/ min～10m
3/ min, displacement fluid injection rate 5m
3～500m
3.
2. the method that in the cbm development based under the broken glue of low temperature, guanidine glue laminated is split, is characterized in that: it comprises the following steps:
1) injecting pre-prepad fluid, is active water Injection Well under by pump by pre-prepad fluid to the extraction well that completes drilling well, makes generation crack, coal seam, injection pressure ﹥ coal seam fracture pressure, and it is 0.5m that pre-prepad fluid injects discharge capacity
3/ min～10m
3/ min, pre-prepad fluid injection rate is 5m
3～500m
3;
2) inject prepad fluid, described prepad fluid is viscous liquid, and the viscosity of viscous liquid is 5～500mPa.s, and it is 0.5m that viscous liquid injects discharge capacity
3/ min～10m
3/ min, viscous liquid injection rate 1m
3～500m
3;
3) inject load fluid, the average sand ratio of load fluid is more than 10%, and it is 0.5m that load fluid injects discharge capacity
3/ min～10m
3/ min, load fluid injection rate 5m
3～500m
3;
4) inject displacement fluid, described displacement fluid is active water, and it is 0.5m that active water injects discharge capacity
3/ min～10m
3/ min, active water injection rate 5m
3～500m
3;
5) termination of pumping, surveys coal seam pressure drop, and the termination of pumping time is more than 10min;
6) inject gel breaker, it is 0.5m that gel breaker injects discharge capacity
3/ min～10m
3/ min, gel breaker injection rate 5m
3～500m
3;
7) inject displacement fluid, it is 0.5m that displacement fluid injects discharge capacity
3/ min～10m
3/ min, displacement fluid injection rate 5m
3～500m
3.
3. the method that in the cbm development based under the broken glue of low temperature, guanidine glue laminated is split, is characterized in that: it comprises the following steps:
1) inject prepad fluid, to the extraction well that completes drilling well by pump by under prepad fluid Injection Well, make generation crack, coal seam, injection pressure ﹥ coal seam fracture pressure, described prepad fluid is viscous liquid, and the viscosity of viscous liquid is 5～500mPa.s, and it is 0.5m that viscous liquid injects discharge capacity
3/ min～10m
3/ min, viscous liquid injection rate 1m
3～500m
3;
2) inject gel breaker, it is 0.5m that gel breaker injects discharge capacity
3/ min～10m
3/ min, gel breaker injection rate 1m
3～500m
3;
3) inject insulating liquid, described insulating liquid is active water, and it is 0.5m that insulating liquid injects discharge capacity
3/ min～10m
3/ min, insulating liquid injection rate 0.5m
3～500m
3;
4) inject load fluid, the average sand ratio of load fluid is more than 10%, and it is 0.5m that load fluid injects discharge capacity
3/ min～10m
3/ min, load fluid injection rate 5m
3～500m
3;
5) inject displacement fluid, described displacement fluid is active water, and it is 0.5m that active water injects discharge capacity
3/ min～10m
3/ min, active water injection rate 5m
3～500m
3;
6) termination of pumping, surveys coal seam pressure drop, and the termination of pumping time is more than 10min;
7) inject gel breaker, it is 0.5m that gel breaker injects discharge capacity
3/ min～10m
3/ min, gel breaker injection rate 5m
3～500m
3;
8) inject displacement fluid, it is 0.5m that displacement fluid injects discharge capacity
3/ min～10m
3/ min, displacement fluid injection rate 5m
3～500m
3.
4. the method that in the cbm development based under the broken glue of low temperature, guanidine glue laminated is split, is characterized in that: it comprises the following steps:
1) inject prepad fluid, to the extraction well that completes drilling well by pump by under prepad fluid Injection Well, make generation crack, coal seam, injection pressure ﹥ coal seam fracture pressure, described prepad fluid is viscous liquid, and the viscosity of viscous liquid is 5～500mPa.s, and it is 0.5m that viscous liquid injects discharge capacity
3/ min～10m
3/ min, viscous liquid injection rate 1m
3～500m
3;
2) inject load fluid, the average sand ratio of load fluid is more than 10%, and it is 0.5m that load fluid injects discharge capacity
3/ min～10m
3/ min, load fluid injection rate 5m
3～500m
3;
3) inject displacement fluid, described displacement fluid is active water, and it is 0.5m that active water injects discharge capacity
3/ min～10m
3/ min, active water injection rate 5m
3～500m
3;
4) termination of pumping, surveys coal seam pressure drop, and the termination of pumping time is more than 10min;
5) inject gel breaker, it is 0.5m that gel breaker injects discharge capacity
3/ min～10m
3/ min, gel breaker injection rate 5m
3～500m
3;
6) inject displacement fluid, it is 0.5m that displacement fluid injects discharge capacity
3/ min～10m
3/ min, displacement fluid injection rate 5m
3～500m
3.
5. the method that in a kind of cbm development based under the broken glue of low temperature according to claim 3, guanidine glue laminated is split, is characterized in that: described gel breaker is any one in acidifying series products of oxidants product or oil field.
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| CN201310512525.9A CN103573244A (en) | 2013-10-25 | 2013-10-25 | Method for fracturing guanidine gum in coal bed gas development based on low-temperature gum breaking |
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Application publication date: 20140212 |