A kind of high temperature hard rubber recyclable foam drilling fluid and preparation method thereof

Abstract

The invention discloses a high-temperature hard rubber recyclable foam drilling fluid and a preparation method thereof. 0.2~0.8 parts of low molecular weight anti-high temperature foam stabilizer, 1~2 parts of bubble film density reducing agent and 0.1~0.2 parts of high temperature wetting agent are pre-prepared into high temperature resistant hard rubber base liquid in clear water, and then the temperature resistant sodium bentonite is mixed. 0~3 parts of alkaline regulator, 0.3~0.5 parts of high temperature foaming agent, 0.1~0.5 parts of high temperature and salt resistant fluid loss reducer and 1~3 parts of high temperature resin fluid loss reducer and mixed evenly. Add it into the high temperature resistant base liquid while stirring, and stir it with a low-speed strong stirrer for 5 to 7 hours. The invention has low solid phase content, strong membrane structure, excellent foam stabilization effect under high temperature environment, improves the recirculation times of the completion fluid after the micro-foam drilling fluid and the loss-stopping effect under high temperature and high pressure, and makes the recirculatable micro-foam drilling and completion fluid safe. It is efficiently used in the exploitation of medium, high temperature and low pressure oil and gas resources, geothermal wells or salt gypsum layers, etc., to meet the drilling needs of deep and ultra-deep wells.

Description

technical field [0001] The invention relates to the technical field of leakage prevention and plugging of drilling engineering, in particular to a foam drilling fluid with high temperature resistance and strong membrane structure, which can be recycled on the ground and in the wellbore and a preparation method thereof. Background technique [0002] Foam drilling fluid is a low-density key drilling fluid technology for low-pressure and malignant leakage formations. The main development is the inflatable foam drilling fluid technology and the recirculating foam drilling fluid technology. [0003] The inflatable foam drilling fluid cannot be recycled in the well. It enters the well after being foamed by special equipment at the wellhead. After the foam fluid returns to the wellhead, it is separated from liquid, gas and solid by physical degassing or chemical defoaming, and then added to the recovered base fluid. The foaming agent or special treatment agent is re-inflated and f...

AI Technical Summary

Problems solved by technology

[0007] In order to solve the shortcomings of the existing foam drilling fluid such as short half-life of foam after high temperature and high requirements for additional equipment on site, insufficient service life of recirculating foam drilling fluid, few cycles, or high content of bentonite, the present invention provides a high-temperature hard glue recirculating foam drilling Liquid and its preparation method, in order to improve the surface strength of the microfoam system, enhance the film elasticity of the microfoam in the high temperature and pressure environment of the wellbore and the bottom of the well, prolong the half-life of the foam, and increase the cycle times of the microfoam drilling fluid technology

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