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Fracturing method for reservoirs based on schistose propping agents and gas wetting reversal agents

A wetting reversal and proppant technology, applied in the field of reservoir fracturing, can solve the problems of decreased conductivity of coalbed methane, poor effect, and reduction of seepage channels, etc., and achieves improved conductivity, increased flow channels, The effect of increasing production

Inactive Publication Date: 2018-06-22
CHINA UNIV OF GEOSCIENCES (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] For example, the on-site coalbed methane hydraulic fracturing development effect is not good, because the traditional fracturing proppant is more likely to be embedded in the coal seam, resulting in a decrease in the conductivity of the coalbed methane; The influence of coal seam or ordinary traditional proppant is usually water-wet or moderately wet, so that water will adhere to the surface of coal seam or proppant, reducing the seepage channel, resulting in a decrease in the conductivity of coalbed methane

Method used

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  • Fracturing method for reservoirs based on schistose propping agents and gas wetting reversal agents
  • Fracturing method for reservoirs based on schistose propping agents and gas wetting reversal agents
  • Fracturing method for reservoirs based on schistose propping agents and gas wetting reversal agents

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Embodiment 1

[0032] This embodiment is coal seam hydraulic fracturing, such as Figure 4 As shown, the gas-wetting reversal agent is added to the pre-fluid of the water tanker 9, and the sheet-like proppant is mixed with the sand-carrying fluid and the pre-fluid in the pump truck 10 to form a fracturing fluid, and the coal seam is fracturing through the wellbore 13. Hydraulic fracturing, forming a plurality of fracturing fractures 12 . After determining the target coal seam, the average hydraulic fracturing displacement of CBM Vertical Well 11 is 8-10m 3 / min, the amount of fracturing fluid is determined according to the scale of the site, the ratio of pre-fluid and sand-carrying fluid is about 1:1, and 0.1% of the total weight of the fracturing pre-fluid is added to the fracturing pre-fluid. According to the site conditions, choose 0.01% concentration of sodium lauryl sulfate to add to the pre-fluid to promote the fracturing hydraulic pressure to enter the soft coal seam and crush the co...

Embodiment 2

[0053] The gas wetting reversal agent is added to the pre-fluid of the water tanker, and the coal gangue sheet-like proppant is mixed with the sand-carrying fluid and the pre-fluid in the pump truck to form a fracturing fluid, and the coal seam is hydraulically fractured through the wellbore. Multiple fractures are formed. After determining the target coal seam, the average hydraulic fracturing displacement of the CBM vertical well is about 8m 3 / min, the amount of fracturing fluid is determined according to the scale of the site, the ratio of pre-fluid and sand-carrying fluid is about 1:1, and 0.01% of the total weight of the fracturing pre-fluid is added to the fracturing pre-fluid. According to the site conditions, choose 1% sodium lauryl sulfate to add to the pre-fluid to promote the fracturing hydraulic pressure to enter the soft coal seam and crush coal, and reduce the pump pressure; if the total pre-fluid is 1000m 3 Then you need to use about 100kg sodium lauryl sulfat...

Embodiment 3

[0055] The gas wetting reversal agent is added to the pre-fluid of the water tanker, and the coal gangue sheet-like proppant is mixed with the sand-carrying fluid and the pre-fluid in the pump truck to form a fracturing fluid, and the coal seam is hydraulically fractured through the wellbore. Multiple fractures are formed. After determining the target coal seam, the average hydraulic fracturing displacement of the CBM vertical well is about 10m 3 / min, the amount of fracturing fluid is determined according to the scale of the site, the ratio of pre-fluid and sand-carrying fluid is about 1:1, and 0.0001% of the total weight of the fracturing pre-fluid is added to the fracturing pre-fluid. According to the site conditions, 10% sodium lauryl sulfate is added to the pre-fluid to promote the fracturing hydraulic pressure into the soft coal seam and crush the coal, and reduce the pump pressure; if the total pre-fluid is 1000m 3 Then you need to use about 100kg of sodium lauryl sulf...

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Abstract

The invention discloses a fracturing method for reservoirs (including hydrocarbon reservoirs, coal seams and so on) based on schistose propping agents and gas wetting reversal agents. When the fracturing method for the reservoirs is applied, schistose (including gangues, walnut shells and so on) propping agents with the total weight of the propping agents being 1.0%-99.0% are added to sand-carrying fluid, and others are traditional spherical (including quartz sand, ceramic particles, and so on) propping agents; gas wetting reversal agents which accounts for 0.0%-10.0% of the total weight of fracturing prepad fluid are added to the fracturing prepad fluid; and the wettability of the surfaces of the propping agents are changed into aerophily by adopting the gas wetting reversal agents, namely, gas wetting. According to the fracturing method for the reservoirs (including the hydrocarbon reservoirs, the coal seams and so on) based on the schistose propping agents and the gas wetting reversal agents, the gas extraction effect such as coal-bed methane wells or downhole hydraulic fracturing is improved through the fracturing method, fracturing fluid adding the gas wetting reversal agents,and the schistose propping agents, so that the flow conductivity of coal-bed methane is improved, and then the production of the coal-bed methane is increased effectively.

Description

technical field [0001] The invention relates to a reservoir fracturing method, in particular to a reservoir fracturing method based on a sheet-like proppant and a gas-wetting reversal agent. Background technique [0002] With the depletion of traditional energy sources such as oil and natural gas, more and more new energy sources such as coalbed methane and shale gas have attracted more and more attention. Nowadays, fracturing, such as hydraulic fracturing, is often used to develop geological energy reservoirs. [0003] Taking coal seams as an example, because the permeability of most coal seams is very low, it is far from enough to rely on the side of the wellbore cylinder as the exhaust surface, so artificially enhanced pressurization measures must be taken, including hydraulic fracturing of coal seams, horizontal drilling Vent holes and cave stress relief, etc. The development of coalbed methane using a whole set of technological processes with drilling hydraulic fractur...

Claims

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Application Information

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IPC IPC(8): E21B43/267
CPCE21B43/267
Inventor 李克文贾霖周建斌闫志铭王永伟董润平
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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