A kind of polymer type non-crosslinking self-steering acidifying diverting agent and preparation method thereof
A technology of acidification diversion and non-crosslinking, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., and can solve problems such as secondary damage to formations and increased polymer viscosity
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[0047] Preferably, the preparation method of the polymer-type non-crosslinked self-steering acidification steering agent includes the following steps:
[0048] 1) By mole percentage, dissolve blocks a, b, c, and d in water in sequence to obtain mixed solution A;
[0049] 2) Use an alkaline regulator to adjust the pH of the mixed solution A within the range of 7-9, and add 0.20~0.30% initiator of the total monomer mass to the mixed solution A to initiate the polymerization reaction, where the polymerization reaction is between 45-55 ℃, under the protection of nitrogen for 5-7h, the gel-like product is obtained;
[0050] 3) After washing the obtained gel product with ethanol for 3-5 times, it is dried at 45-55° C. for 20-24 hours and pulverized to obtain a polymer-type non-crosslinked self-steering acidification steering agent.
[0051] Wherein, in step 2), the alkalinity regulator is selected from one of sodium bicarbonate, disodium hydrogen phosphate, calcium hydroxide or sodium hydro...
Embodiment 1
[0054] A polymer type non-crosslinking self-steering acidification steering agent, including blocks a, b, c, d, in mole percentage:
[0055] a accounts for 95%, b accounts for 1%, c accounts for 3%, and d accounts for 1%. The preparation method is as follows:
[0056] 1) Dissolve blocks a, b, c, and d in water in sequence according to the above mole percentages to obtain mixed solution A;
[0057] 2) Use an alkaline regulator to adjust the pH of the mixed solution A, and add the initiator to the mixed solution A to initiate the polymerization reaction to obtain a gel-like product;
[0058] 3) Washing, drying, and pulverizing the obtained gel product to obtain a polymer-type non-crosslinked self-steering acidification steering agent.
[0059] Among them, the alkaline regulator used in step 2) is sodium hydroxide, and the pH value of the mixed solution A is adjusted to 8; the initiator is azobisisobutamidine hydrochloride, and its dosage is the total mass of the monomer 0.20%, the initi...
Embodiment 2
[0061] A polymer type non-crosslinked self-steering acidification steering agent, including blocks a, b, c, and d, calculated by weight percentage:
[0062] a accounts for 95%, b accounts for 1%, c accounts for 3%, and d accounts for 1%.
[0063] The preparation method is the same as that described in Example 1. Among them, the alkaline regulator used in step 2) is sodium bicarbonate, and the pH value of the mixed solution A is adjusted to 7; the initiator is azobisisobutamidine hydrochloride, and its dosage is the total mass of the monomer 0.30%, the initiator was added to the mixed solution A to initiate the polymerization reaction, where the polymerization reaction was carried out at 50° C. under the protection of nitrogen for 6 hours to obtain a gel-like product. Wherein, in step 3), the obtained gel product is washed 3 times with ethanol and dried at 50° C. for 23 hours to obtain a polymer-type non-crosslinked self-steering acidification steering agent.
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