Non-sulfonation high temperature resisting and filtrate loss reduction type water-based drilling fluid

Abstract

The invention relates to non-sulfonation high temperature resisting and filtrate loss reduction type water-based drilling fluid. A formula of the drilling fluid provided by the invention comprises the following components based on 100 percent of the weight: 1 percent to 4 percent of bentonite, 0.25 percent to 3 percent of CCM (compound liquid of xanthan gum and N,N'-methylene-bisacrylamide), 2 percent to 4 percent to NMPS (carboxy styrene-butadiene latex), 0.5 percent to 2 percent of MMC (cation emulsified asphalt), 3 percent to 5 percent of Na2CO3, 0.25 percent to 1 percent of DM (high temperature resisting and filtrate loss reduction dispersion liquid) and the balance of water. The drilling fluid provided by the invention has high temperature resisting and filtrate loss reduction performance; a researched synthetic material of the high temperature resisting and filtrate loss reduction type water-based drilling fluid is easy to obtain and low in construction cost, so that the synthetic material is suitable for large-scale industrial production and has oilfield application potential. Furthermore, a drilling fluid system responds to the call on environment protection of China, and the whole system abandons a polysulfonate treatment agent.

Description

technical field [0001] The invention relates to the field of petroleum drilling, in particular to a non-sulfonated high-temperature-resistant and fluid-loss-reducing water-based drilling fluid. Background technique [0002] In recent decades of exploration and development, the crude oil in the shallow section has basically been developed, except for a small amount of oil layers that have not been discovered or exploited. At present, my country's main productive reservoirs are mainly located in deep well sections, for example, the Tarim deep well in my country is as deep as 8408m. With the deepening of oil development and drilling, the downhole high temperature and high pressure environment is inevitable. In addition, experimental research and field construction show that a substantial increase in temperature and pressure will significantly increase the fluid loss of commonly used drilling fluid systems. A large amount of drilling fluid fluid loss will cause hydration expan...

AI Technical Summary

Problems solved by technology

In addition, experimental research and field construction have shown that a substantial increase in temperature and pressure will significantly increase the fluid loss of commonly used drilling fluid systems

A large amount of drilling fluid fluid loss will cause hydration expansion and dispersion of shale, block seepage channels, cause pipe sticking, and in severe cases, easily cause well wall instability

Images