Novel reverse circulation drilling method
A drilling method and reverse circulation technology, applied in drilling equipment and methods, drilling compositions, chemical instruments and methods, etc., can solve problems such as difficulty in guaranteeing construction quality and drilling quality, and achieve hole formation good indicators
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[0034] Such as figure 1 As shown, the present invention discloses a novel reverse circulation drilling method, comprising the following steps:
[0035] Step 1, setting a circulation tank; the circulation tank includes a slurry tank and a sedimentation tank, and the slurry tank is connected to the top of the sedimentation tank;
[0036] Step 2, configure the mud; the mud uses a bentonite composition, in terms of mass fraction, the bentonite composition includes 4-8 parts of bentonite, 0.004-0.008 parts of carboxymethyl cellulose, 0.1-0.4 parts of soda ash, ferrochrome wood 0.1-0.3 parts of sulfonic acid sodium salt dispersant, 0.003 parts of polyacrylamide flocculant, 100 parts of water; the bentonite composition also includes a weighting agent, and the weighting agent is barite, galena, perlite , at least one of limestone, the addition of the weighting agent is determined according to the soil density of the construction site;
[0037] Step 3, drilling; during the drilling o...
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