Shallow-layer plugging agent
A plugging agent and shallow layer technology, which is applied in the direction of drilling composition, chemical instruments and methods, etc., can solve the problems of drilling bit on the original well casing, low success rate of cement operation, and increased operating cost.
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[0016] The present invention is further described below.
[0017] A shallow plugging agent, with oil well cement as the base, adding fluid loss reducer, dispersant, active agent and modifier, the specific formula is: oil well cement as the base; fluid loss reducer 0.3% to 1.2% (mass percentage); dispersant 0.3% to 1.0% (mass percentage); active agent 0.1% to 1.0% (mass percentage); modifier 2.0% to 4.0% (mass percentage).
[0018] The water loss reducer is SZ type water loss reducer or HR.RC800 water loss reducer, the dispersant is SZA-2 or SXY, the active agent is SN-2, and the modifier is SX-1.
[0019] The shallow layer plugging agent is 1.85-1.95g / cm 3 .
[0020] In the formula of the shallow leakage plugging agent, 0.3% (mass percentage) of fluid loss reducer SZ1-2 is added to wells with a depth of less than 1000 meters; 0.6% (mass percentage); add fluid loss reducer SZ1-2 to 1.0% (mass percentage) in wells with a depth of 2000-3000 meters; add fluid loss reducer SZ1-2...
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