A kind of preparation method of biological glue for fracturing

Abstract

The invention discloses a preparation method for biological glue for fracturing. The method is realized through the following steps: step 1: preparing a water phase from the following components in parts by weight: 40 to 88 parts of water, 2 to 10 parts of rosin-based polyoxyethylene sodium sulfosuccinate monoester and 10 to 50 parts of acrylamide; step 2: preparing an oil phase from the followingcomponents in parts by weight: 90 to 99 parts of white oil and 1 to 10 parts of Span 80; step 3: preparing emulsion from the following components in parts by weight: 30 to 60 parts of the water phaseprepared by the step 1 and 40 to 70 parts of the oil phase prepared by the step 2; under a stirring state, slowly adding the water phase into the oil phase; after adding the water phase, performing circular emulsifying for 1 to 3 times by utilizing a homogenization emulsifying pump; step 4: carrying out a polymerization reaction: adding the emulsion prepared by the step 3 into a reaction kettle with a stirrer; performing stirring and introducing nitrogen gas for 10 minutes or more; adding 0.005 to 0.1 part of an oxidant and raising the temperature to be 35 to 45 DEG C; then slowly dropwise adding 0.005 to 0.1 part of a reducing agent and completing the adding after 2 to 5 hours; and after completing the adding of the reducing agent, preserving heat at 35 to 45 DEG C for 1 hour, so as to prepare the biological glue.

Description

[0001] 1. Technical field: [0002] The invention belongs to the technical field of fracturing fluid for hydraulic fracturing of oil and gas wells, and in particular relates to a preparation method of biological glue for fracturing. [0003] 2. Background technology: [0004] Hydraulic fracturing of oil and gas wells is to use surface high-pressure pumps to inject fracturing fluid containing chemical agents into the well at a displacement that greatly exceeds the absorption capacity of the formation, and then suffocate high pressure near the bottom of the well. When this pressure exceeds the ground stress near the borehole wall and the tensile strength of the rock, fractures are formed in the formation. If there are proppants such as quartz sand and ceramsite in the liquid, after the pump is stopped, the liquid will return to the ground under the pressure of the formation pressure, while the proppant will stay in the formation and form in the formation with sufficient length, c...

AI Technical Summary

Problems solved by technology

[0009] However, guar gum fracturing fluid also has obvious disadvantages: more types of additives are required in the preparation process, high gel-breaking residue, easy to be corrupted and deteriorated, high construction friction, and difficulties in large-displacement operations

However, the construction friction is still high, and many additives are required in the preparation process. The salt resistance is poor, and it is not suitable for the reuse of gel-breaking flowback fluid.

[0012] Hydrophobic high-molecular polymer fracturing fluid requires few additives in the preparation process, but its sand-carrying performance is poor, and it swells slowly in brine, so it is not suitable for the reuse of gel-breaking flowback fluid

[0013] Hydrophobic surfactants require fewer additives in the preparation process of fracturing fluids, swell quickly in brine, and are suitable for reuse of gel-breaking flowback fluids; but they are expensive, have poor temperature resistance, and limited use conditions

[0014] Xanthan gum-based polymer bio-glue has good salt resistance, and the prepared fracturing fluid has low friction, but poor sand-carrying property and temperature resistance

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