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Well completion formate liquid for well drilling

A formate and completion fluid technology, applied in the field of drilling and completion fluids, can solve problems such as oil and gas formation pollution, and achieve the effects of improving temperature resistance, low viscosity and strong inhibition.

Inactive Publication Date: 2005-06-22
DAQING PETROLEUM ADMINISTRATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the serious pollution of oil and gas layers by existing well completion fluids, the present invention provides a formate drilling and completion fluid, which is beneficial to protect oil and gas layers and stabilize the borehole wall

Method used

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  • Well completion formate liquid for well drilling

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Example 1: The drilling and completion fluid of the above scheme 1 was used to carry out on-site construction on Daqing Songfangtun 210-154. The result was that the sealed well diameter was regular, the well diameter was close to a straight line, the average borehole expansion rate was less than 8%, and the well logging was successful once. The cementing quality is high quality, and the density of the drilling and completion fluid is controlled at 1.20g / cm 3 The water loss is less than 5ml, meeting the requirements of the completion fluid in terms of density required for well control, temperature required for storage, and chemical compatibility between the completion fluid and the formation. The average oil production intensity is 2.32t / d.m, which is conducive to protecting the reservoir layer drilling and completion fluid, suitable for popularization and application.

Embodiment 2

[0018] Embodiment 2: Use the drilling and completion fluid of the above scheme 2 to carry out on-site construction of Daqing Songfangtun 212-156, and the viscosity of the drilling fluid is controlled at less than 55g / cm 3 Within the range, the cuttings carrying ability is strong, the sand returning effect is good, there is no pipe sticking phenomenon, the logging is successful once, and the cementing quality reaches 92%, which meets the density required for well control, the temperature required for storage and the completion fluid. The chemical compatibility between the liquid and the formation requires little damage to the oil and gas layer, which is conducive to the anti-collapse and stability of the well wall.

Embodiment 3

[0019] Example 3: Daqing Zhao 9-39 was applied on-site using the drilling and completion fluid of the above scheme 3. The completed drilling depth was 1595-1615 meters, the drilling cycle was 4-5 days, and the average ROP of the scraper bit was 36.2 meters / hour, the average ROP of the PDC bit is 20.1 m / h, and the average ROP of the whole well is 30.3 m / h. Compared with other wells in the same block, the ROP is equivalent, the wellbore in the sealing section is regular, and the hole expansion rate Less than 6%, it is beneficial to ensure the cementing quality.

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Abstract

The invention relates to formate salt drilling and completion fluid used in the technical field of petroleum geological exploration and development. It solves the problem that existing drilling and completion fluids cause serious pollution to oil and gas layers. It is characterized in that: the ingredients and proportions are as follows in parts by weight: 0.2-0.8 parts of anti-salt coating agent, 1.5-5.5 parts of anti-salt inhibitor, 2-6.2 parts of anti-slumping agent, and 1.7-6.8 parts of anti-salt blocking agent 2.0-16.0 parts of formate, 0.5-3.0 parts of anti-salt viscosity reducer and 67-87 parts of water. The drilling and completion fluid has the characteristics of protecting oil and gas layers and stabilizing the well wall, with stable performance, strong inhibition, non-corrosiveness, and is conducive to the smooth progress of drilling construction.

Description

Technical field: [0001] The invention relates to a drilling and completion fluid used in the technical field of petroleum geological exploration and development, which belongs to the formate drilling and completion fluid. Background technique: [0002] In the drilling process, in order to ensure the quality of drilling and completion, in addition to the use of some special mechanical equipment, some special fluids are also required. This fluid is the drilling and completion fluid. The liquid used in the whole process of oil well production must not only meet the requirements of the process, but also effectively protect the oil layer. For example, the drilling and completion fluid for drilling oil layers should not only stabilize the well wall, but also have a certain liquid column pressure to balance the stress in the ground and prevent fluid from invading into the well to cause well kicks and blowouts; Quality, keep the wellbore stable, prevent differential pressure sticki...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B33/12
Inventor 宋瑞宏顾永福王淑华
Owner DAQING PETROLEUM ADMINISTRATION