Drilling flushing liquid with excellent anti-collapse performance and preparation method thereof

Abstract

The invention discloses a drilling flushing liquid with excellent anti-collapse performance and a preparation method thereof. Each cubic meter of the drilling flushing liquid is prepared from, by weight, 12.5-50 kg of a matrix, 0.8-1.2 kg of sodium hydroxide, 1.8-2.2 kg of carboxymethyl cellulose, 0.4-0.6 kg of potassium polyacrylate, 5-15 kg of a fluid loss reducer and 1.2-1.8 kg of a liquid lubricant, wherein the matrix is selected from bentonite and/or calcium carbonate. According to the stratum conditions of a Qinghai Muli coal field, the anti-collapse drilling flushing liquid which is more simplified in formula but better in effect is obtained through a new test method and has the advantages that type selection and proportioning are scientific and reasonable, the anti-collapse performance is excellent, the preparation process is simple, and the production cost is low.

Description

technical field [0001] The invention relates to the field of drilling flushing fluid, in particular to a drilling flushing fluid with excellent anti-collapse performance. Background technique [0002] In core drilling, to ensure high-quality, fast and safe drilling, the correct selection and use of flushing fluid play a very important role, so the flushing fluid is called "blood" in the drilling process. Its functions are as follows: 1. Clean the bottom of the hole, suspend and carry rock powder, and prevent the rapid sedimentation of rock powder and cause buried drilling accidents. 2. Cool the drill bit and improve the service life of the drill bit. 3. Lubricate the drill bit and drill tool, reduce the vibration of the drill tool, reduce the load on the power machine of the drill rig, and make the drill bit work smoothly. 4. Form a mud skin to protect the hole wall and effectively prevent the hole wall from expanding and collapsing. 5. Convey the core. 6. When turbo dri...

AI Technical Summary

Problems solved by technology

[0006] The current drilling problem in the Muli Coalfield is that the Middle Jurassic oil shale in the Muli Coalfield is relatively thick, with a large dip angle and serious fragmentation, and hole wall collapse accidents are very easy to occur when encountering water, resulting in more common and serious hole wall collapse. , the existing anti-slump flushing fluid is difficult to play a good anti-slump effect on the Muli coalfield