At Shengquan district of Turpan-Hami oil fields, collapsing salt-gypsous strata are encountered in oil drilling and Cl - content in the drilling fluids used is high (2×10 4～5×10 4 mg/L and up to 7.8×10 4 mg/L in some cases). The quality of well cementing jobs performed is unsatisfactory.
Through the experiment, we established the effective solidification method at the waste drilling liquid of Jilin Oilfield, and probed into the impact on solidification effect of the single reagent. Through cross-over experiment a best solidification constitutes of 1.5%A+1.0%B+15.0C%+8.0%D is confirmed.
At high temperature or SRB or electrolytic action, the sulfonated high molecular compound of water --based drilling mud conditioning agent is degraded releasing out H_2S. The corrosion products are Fe_9S_8 at room temperature, and FeS when temperature is above 60℃. The derived H_2S is also hazard.
In this article we will consider percolation of the drilling mud through the crust.
The calculations take into account the presence of a drilling mud filtrate penetration zone in the neighborhood of the well.
The test method is successfully verified using a color comparator or a minireflectometer with a red light-emitting diode as applied to samples of natural water from drilling mud flows and aqueous solutions containing 1,1-dimethylhydrazine.
An approximate one-dimensional theory of the process of transport of heavy solid rock particles by the flow of drilling mud in a vertical well is proposed.
This fact has been suggested for use in creation of colmatage barriers that prevent penetration of drilling mud into strata.