Anti-collapse and leakproof drilling fluid and construction method thereof

A construction method and drilling fluid technology, applied in the field of petroleum drilling, can solve problems such as the inability to use liquid column pressure to support the well wall, the inability to effectively block the leaky layer channel, and the high-inclination well section without increasing the density, so as to achieve the goal of suppressing the well The effect of reducing the occurrence of collapse, shortening the drilling cycle, and reducing the drilling cycle

Active Publication Date: 2014-09-17
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

[0005] 1. Lost circulation occurred in the Yanchangdi, Liujiagou and Shihezi formations in the Sulige block, especially the Liujiagou formation has low pressure bearing capacity and low solid phase content in the drilling fluid. Effective plugging of leaky layer channels, difficult plugging, long plugging well section, lo

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  • Anti-collapse and leakproof drilling fluid and construction method thereof

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Embodiment 1

[0046] Aiming at the geological characteristics of the Mesozoic Triassic strata, the present invention provides an anti-slump and anti-leakage drilling fluid, which is characterized in that: the composition of the drilling fluid per cubic meter is: 1.5-2kg polyanionic cellulose, 20-30kg Drilling fluid anti-salt fluid loss agent, 25-30kg water-dispersed emulsified asphalt powder, 30-40kg superfine calcium carbonate, 50-60kg sodium formate, 1-1.5kg sodium hydroxide, 30-40kg potassium chloride, and the balance is clear water .

[0047] In this embodiment, sodium hydroxide is added to the drilling fluid to adjust the pH of the drilling fluid to 8-9.

[0048] In this embodiment, the drilling fluid is directly compounded and used.

Embodiment 2

[0050] An anti-collapse and anti-leakage drilling fluid is characterized in that: the composition of the drilling fluid per cubic meter is: 1.5kg polyanionic cellulose, 20kg drilling fluid anti-salt fluid loss reducer, 25kg water-dispersible emulsified asphalt powder, 30kg ultrafine Calcium carbonate, 50kg sodium formate, 1kg sodium hydroxide, 30kg potassium chloride, and the balance is clear water.

[0051] In this embodiment, sodium hydroxide is added to the drilling fluid to adjust the pH of the drilling fluid to 8-9.

[0052] In this embodiment, the drilling fluid is directly compounded and used.

Embodiment 3

[0054] An anti-collapse and anti-leakage drilling fluid is characterized in that: the composition of the drilling fluid per cubic meter is: 2kg / m 3 Polyanionic cellulose 30kg drilling fluid anti-salt fluid loss reducer, 30kg water-dispersed emulsified asphalt powder, 40kg superfine calcium carbonate, 60kg sodium formate, 1.5kg sodium hydroxide, 40kg potassium chloride, and the balance is clear water.

[0055] In this embodiment, sodium hydroxide is added to the drilling fluid to adjust the pH of the drilling fluid to 8-9.

[0056] In this embodiment, the drilling fluid is directly compounded and used.

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Abstract

The invention relates to the technical field of petroleum drilling, and particularly relates to anti-collapse and leakproof drilling fluid and a construction method thereof, which are applicable to a Mesozoic Triassic stratum having the characteristics of low loading capacity, repeated block leakage and large leaking stoppage difficulty. The drilling fluid is composed of polyanionic cellulose, a drilling fluid salt-resistant filtrate-loss reducer, water dispersible emulsified asphalt powder, ultrafine calcium carbonate, sodium formate, sodium hydroxide, potassium chloride and water. Due to the application of a salt-poor low soil phase, the sealing capacity of a mud cake is improved and the loading capacity of the stratum is enhanced; low density is effectively controlled, and the probability of induced lost circulation is reduced; and the pump delivery is reduced, and the erosion of the drilling fluid to the wall of a well is reduced, thereby protecting the wall of the well from collapsing. According to the invention, through enhancing the loading capacity of the stratum, the low density is effectively controlled, the pump delivery is reduced, the probability of lost circulation is reduced, the drilling cycle of the block is greatly reduced, and the drilling cycle is shortened by over 50%.

Description

technical field [0001] The invention relates to the technical field of petroleum drilling, in particular to an anti-slump and anti-leakage drilling fluid and a construction method thereof, which are suitable for Mesozoic Triassic strata with low pressure bearing capacity, repeated block leakage and great difficulty in plugging. Background technique [0002] The Sulige block is mainly distributed in the Ordos Basin of the Inner Mongolia Autonomous Region. The geological structure of this block belongs to the Yishan slope, in which the Yanchang Formation and Liujiagou Formation belong to the Mesozoic Triassic strata, and the lithology of the Yanchang Formation is mainly gray-green, dark Mudstone and gray sandstone are interbedded, and the burial depth is about 1500-2300 meters. The lithology of the Liujiagou Formation is mainly gray-purple and gray-white massive sandstone, and the burial depth is about 2500-2950 meters. The upper part of the Shihezi Formation is a set of conti...

Claims

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Application Information

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IPC IPC(8): C09K8/10C09K8/48
CPCC09K8/10C09K8/206C09K8/48C09K8/487E21B21/003
Inventor 陈华杨勇平石崇东王社利孙志强刘乃春贾彦强刘思远王凯侯博付红卫吴瑞鹏
Owner BC P INC CHINA NAT PETROLEUM CORP
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