Automatic control system and method for well cementing annulus pressure

Abstract

The invention discloses an automatic control system and method for the well cementing annulus pressure, and relates to technical field of petroleum engineering well cementing. The automatic control system comprises a pressure compensation pump, a hydraulic throttle valve, a pressure sensor and a data collection control center, and the data collection control center automatically controls opening and closing of the pressure compensation pump and the hydraulic throttle valve by comparing the value Pi of the annulus pressure transmitted by the pressure sensor and the preset value Pt of the annulus pressure, so that automatic control and adjustment of the well cementing annular pressure are achieved. According to the automatic control system and method for the well cementing annulus pressure,the cement cementing quality of well cementing of an oil and gas well can be improved, well cementing engineering is prevent from being failed, the leasing cost of cement trucks in the process of wellcementing and waiting for cement setting can also be saved, the situation that a well team leader is on guard and duty is not required, and significant comprehensive benefits are achieved.

Description

technical field [0001] The invention relates to the technical field of petroleum engineering well cementing, in particular to an automatic control system and method for cementing annular pressure. Background technique [0002] In the cementing of oil and gas wells, after cementing, in order to prevent reservoir fluid (oil, gas, water, etc.) The pressure drop that develops during solidification. [0003] In actual production, after the cement injection is completed, the annulus is closed first, and then the cement truck is used to pressurize the annulus through the kill manifold. When the pressure value reaches the preset value, the valve of the kill manifold is closed and the cement truck is disassembled. However, due to the high formation temperature, the cement slurry displaced into the annulus is heated up. At the same time, due to the heat release during the cement slurry physical and chemical reaction, the cement slurry in the annulus further heats up, resulting in an ...

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Problems solved by technology

[0004] In the process of realizing the present invention, the inventors found at least the following problems in the prior art: due to the manual operation of the opening degree of the hydraulic plate valve on the kill manifold, the pressure in the annulus fluctuates too much, which in turn affects the annulus The cementing quality of the cement sheath reduces the success rate of oil and gas well cementing construction

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