Isolating and temporary-plugging well-repair working fluid for offshore oilfield and preparation method for isolating and temporary-plugging well-repair working fluid
A working fluid, offshore oil field technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of cement plugging, inability to flow back, unsatisfactory gel breaking effect, etc. Overcome the limited effect and avoid the effect of cement blocking the formation
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Embodiment 1
[0026] Example 1. Preparation and performance evaluation of working fluid for isolation temporary plugging and workover in offshore oilfields
[0027] 1. Preparation of working fluid for isolation temporary plugging and workover in offshore oilfields
[0028] The quality ratio of raw materials is as follows:
[0029] The mass ratio of clear water, sodium dodecylbenzenesulfonate, sodium fatty alcohol polyoxyethylene ether sulfate, sodium carboxymethyl starch, sodium carboxymethylcellulose and sodium trimetaphosphate is 1000:3:2:22:4 :20.
[0030] (1) At 20°C, add sodium dodecylbenzenesulfonate and sodium fatty alcohol polyoxyethylene sulfate (its molecular formula RO(CH 2 CH 2 O)n-SO 3 In Na, n is 2, and R is an alkyl group with 12 carbon atoms);
[0031] (2) At 20°C, slowly add sodium carboxymethyl starch (relative molecular weight is 200,000) and sodium carboxymethyl cellulose (relative molecular weight is 242.16) to the system treated in step (1), and the addition proce...
Embodiment 2
[0048] Example 2. Preparation and performance evaluation of working fluid for isolation temporary plugging and workover in offshore oilfields
[0049] 1. Preparation of working fluid for isolation temporary plugging and workover in offshore oilfields
[0050] The quality ratio of raw materials is as follows:
[0051] The mass ratio of clear water, sodium dodecylbenzenesulfonate, sodium fatty alcohol polyoxyethylene ether sulfate, sodium carboxymethyl starch, sodium carboxymethylcellulose and sodium trimetaphosphate is 1000:3:3:20:3 :20.
[0052] (1) At 20°C, add sodium dodecylbenzenesulfonate and sodium fatty alcohol polyoxyethylene sulfate (its molecular formula RO(CH 2 CH 2 O)n-SO 3 In Na, n is 3, and R is an alkyl group with 15 carbon atoms);
[0053] (2) At 20°C, slowly add sodium carboxymethyl starch (relative molecular weight is 300,000) and sodium carboxymethyl cellulose (relative molecular weight is 242.16) to the system treated in step (1), and the addition proce...
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