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An automatic control system and method for cementing annular pressure

An automatic control system and annular pressure technology, which is applied in earthwork drilling, wellbore/well components, sealing/isolation, etc., can solve the problems of reducing the success rate of oil and gas well cementing construction, excessive fluctuations in annular pressure, and affecting Problems such as the cement annulus cementation quality in the annulus, achieving significant comprehensive benefits, saving rental costs, and improving cement cementation quality

Active Publication Date: 2020-10-09
PETROCHINA CO LTD
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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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  • An automatic control system and method for cementing annular pressure

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Embodiment Construction

[0046] In order to make the technical solutions and advantages of the present invention clearer, the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings. Unless otherwise defined, all technical terms used in the embodiments of the present invention have the same meanings as commonly understood by those skilled in the art.

[0047] An embodiment of the present invention provides an automatic control system for cementing annular pressure. The automatic control system is used to control the annular pressure of the oil well annulus through a well control manifold. The well control manifold includes a kill manifold 1, a node A flow manifold 2 and a pressure gauge 3 for measuring the annular pressure, the automatic control system includes:

[0048] A pressure compensation pump 4 arranged on the kill manifold 1;

[0049] a hydraulic throttle valve 6 arranged on the throttle manifold 2; and

[0050] A pressure ...

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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 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B33/13
CPCE21B33/13
Inventor 谯世均王波黄成贵张闯钟原姜双奎牛刚强
Owner PETROCHINA CO LTD
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