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Fine pressure control well cementing operation method

A fine and cementing technology, which is applied in earthwork drilling, wellbore/well components, sealing/isolation, etc., to achieve fine control of wellhead pressure, ensure downhole pressure, and improve cementing quality

Inactive Publication Date: 2019-04-16
CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to address the defects and deficiencies of the above-mentioned prior art, and to provide a precise pressure-controlled cementing operation method, which can effective

Method used

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  • Fine pressure control well cementing operation method

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Embodiment Construction

[0026] As shown in the figure, as the best embodiment of the present invention, its steps include:

[0027] Step 1: Prepare the wellhead sealing device matching the outer diameter of the running string;

[0028] Step 2: Use conventional cementing software to optimize the design of precise pressure-controlled cementing construction parameters to ensure that the bottom hole pressure is within the safe operating density window;

[0029] Step 3: Run the cementing string under pressure to the design well depth according to the design of fine pressure-controlled cementing, turn on the pump to circulate exhaust, and adjust the density of the drilling fluid in the wellbore to the design value;

[0030] Step 4: After the density of the drilling fluid in the wellbore is stable, stop the pump, add pressure at the wellhead through the fine pressure control surface equipment to ensure the stability of the downhole pressure, and connect to the cementing construction equipment;

[0031] Ste...

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Abstract

The invention discloses a fine pressure control well cementing operation method. The method comprises the following steps of preparing a wellhead sealing device matched with the outer diameter of a tubular column which is put down; conducting optimizing design on fine pressure control well cementing construction parameters through conventional well cementing software; according to fine pressure control well cementing design, putting a well cementing pipe string with pressure to a designed well depth, starting a pump for circular exhaust, and adjusting the density of drilling fluid of a well shaft to a designed value; after the density of the drilling fluid of the well shaft is stable, shutting down the pump, supplying pressure at a wellhead through fine pressure control ground equipment toguarantee the stability of the pressure under the well, and connecting well cementing construction equipment; pumping pre-pad fluid, cement paste, post-pad fluid and drilling fluid according to the fine pressure control well cementing construction design, after the liquid is pumped, the fine pressure control ground equipment gets involved, the under-well pressure reduction value caused by pump stopping is compensated for, and the stability of the pressure under the well is guaranteed; pressure continues to be supplied to the wellhead until cement is set, and then the pressure is relieved. Bymeans of the method, the complicated problem that spraying missing is caused by pressure fluctuation under the well in the construction process of the strata can be effectively solved, and the well cementing quality of the deep well is greatly improved.

Description

technical field [0001] The invention relates to the field of well cementing operations of sulfur-containing oil and gas wells, in particular to a method for cementing operations of narrow safe and airtight windows in sulfur-containing formations. Background technique [0002] As exploration and development gradually move towards deep and complex formations, drilling operations are faced with more complex leaks and blowouts. Precision managed pressure drilling has become an important tool to solve the problems of leaks and blowouts. played an important role. However, in the process of well cementing, there are also complicated situations of blowout leakage. Due to the sensitivity of formation pressure, in order to ensure the safety of well control, when the formation is stabilized by conventional methods, it is easy to cause circulation time during the process of well killing, casing running and pumping cement slurry. Severe leakage or even the return of the wellhead makes i...

Claims

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Application Information

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IPC IPC(8): E21B33/13E21B33/03
CPCE21B33/03E21B33/13
Inventor 梁玉林李枝林陆灯云杨玻庞平江迎军肖润德左星唐国军李照
Owner CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD
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