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Laboratory preparation method for CO2 foam fracturing fluid for coal-bed gas well and prepared foam fracturing fluid system

A foam fracturing fluid, coalbed methane well technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of difficult evaluation of foam performance, immature foam preparation methods, etc., and achieves good foaming effect and heavy results. The effect of strong instantiation and sufficient foaming degree

Inactive Publication Date: 2020-03-06
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] It is an object of the present invention to address the current CO 2 The foam preparation method is immature and needs to be carried out in a closed environment, resulting in CO 2 Foam properties are difficult to evaluate; provide a coalbed methane well CO 2 Laboratory preparation method of foam fracturing fluid, which method is carried out under non-confined conditions

Method used

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  • Laboratory preparation method for CO2 foam fracturing fluid for coal-bed gas well and prepared foam fracturing fluid system
  • Laboratory preparation method for CO2 foam fracturing fluid for coal-bed gas well and prepared foam fracturing fluid system

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Coalbed methane well CO provided by the invention 2 The laboratory preparation method of foam fracturing fluid, the steps are as follows:

[0030] S1. Add foaming agent into distilled water, stir until completely dissolved, then add foam stabilizer, stir until completely dissolved to make base liquid.

[0031] S2. Install the base liquid 5 in the foaming container 1, install the agitator 2 in the foaming container, and use a gas delivery hose 3, one end of which is connected to the liquid carbon dioxide storage tank 4, and the other end is inserted into the foaming container 1, For specific preparation equipment, see figure 1 .

[0032] S3. Insert the hose port below the base fluid level, and feed CO at 5L / min 2 Gas for 10 minutes, discharge the dissolved air in the base liquid, and increase CO 2 Solubility in foam base fluid.

[0033] S4. Lift the hose port to a position 1cm above the base liquid level, and feed CO at 10L / min 2 Gas for 5 minutes, remove the air i...

Embodiment 2

[0036] Coalbed methane well CO provided by the invention 2 The laboratory preparation method of foam fracturing fluid, the steps are as follows:

[0037] S1. Add foaming agent into distilled water, stir until completely dissolved, then add foam stabilizer, stir until completely dissolved to make base liquid.

[0038] S2. Put the base liquid 5 in the foaming container 1, the foaming container has a sealed cover plate 6, and the agitator 2 is installed above the cover plate, and the stirring shaft of the agitator is inserted into the liquid in the foaming container from the center hole of the cover plate. Below the surface, an air inlet 7 and an air outlet 8 are respectively provided on the cover plate. One end of the hose 3 is inserted into the foaming container through the air inlet, and the other end of the hose is connected to the liquid carbon dioxide storage tank 4 . The air is removed from the air outlet, see the specific preparation device figure 1 .

[0039] S3. Inse...

Embodiment 3

[0043] A kind of coalbed methane well CO prepared according to the preparation method of embodiment 1 2 The foam fracturing fluid system includes a gas phase and a liquid phase, and the foam quality is 81.65%; the gas phase is carbon dioxide; based on the total weight of the liquid phase as 100%, the liquid phase includes the following components in weight percentage: 0.2% foaming agent dodecylbenzene Sodium sulfonate, 0.2% foam stabilizer sodium lauryl polyoxyethylene ether sulfate, and the balance is distilled water. This liquid phase is referred to as the base fluid.

[0044] Pour the prepared foam liquid into the graduated cylinder and press the stopwatch to count the time. The volume of the foam liquid in the graduated cylinder is 545ml at this time, and the calculated foam quality is 81.65%. When the volume of the precipitated liquid in the graduated cylinder reaches 50ml, count the reading of the stopwatch at this time For 5min plus 15s, the half-life is 315s.

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Abstract

The invention discloses a laboratory preparation method for CO2 foam fracturing fluid for a coal-bed gas well. The laboratory preparation method comprises the following steps that S1, base fluid containing a foaming agent and a foam stabilizing agent is prepared; S2, the base fluid is put in a foaming container, a stirrer is installed in the foaming container, a gas delivery hose is employed, andone end of the hose is connected with a liquid carbon dioxide storage tank, and the other end of the hose is inserted into the foaming container; S3, the port of the hose is inserted into a position below the fluid level of the base fluid, and CO2 gas is introduced to remove air dissolved in the base fluid, and the dissolved quantity of CO2 in the foam base fluid is increased; S4, the port of thehose is lifted to a position above the fluid level of the base fluid for 1 cm, and the CO2 gas is introduced to remove air in the upper space of the foaming container; and S5, the port of the hose islifted to a position adjacent to a mouth of the foaming container, and the CO2 gas is further introduced, and meanwhile, the stirrer is started to perform stirring for foaming to form the CO2 foam fracturing fluid. Compared with a CO2 foam preparation method under a conventional airtight condition, the laboratory preparation method has the advantages that foaming space in a non-airtight conditionis unlimited, and the foaming property of the system can be accurately evaluated.

Description

technical field [0001] The invention relates to the technical field of coalbed methane exploitation, in particular to a coalbed methane well CO 2 A method for preparing foam fracturing fluid under non-sealed conditions and the prepared foam fracturing fluid system. Background technique [0002] my country is rich in coalbed methane resources, and its geological reserves rank third in the world. With the growth of resource demand and the improvement of mining technology, the exploration and development of coalbed methane are also increasing. The main component of coalbed methane is methane, which is an efficient and pollution-free clean energy. Its reasonable use can reduce the emission of "greenhouse gas", so it has been paid more and more attention by people. [0003] Coal seams are significantly different from conventional reservoirs in reservoir physical properties. The physical properties of coal seams are greatly affected by tectonic movement and compaction. Frequen...

Claims

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Application Information

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IPC IPC(8): C09K8/68C09K8/70
CPCC09K8/604C09K8/665C09K8/68C09K8/703
Inventor 杨兆中宋峙潮白小东李小刚贾敏
Owner SOUTHWEST PETROLEUM UNIV
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