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Mountain flour plugging method

A plugging method and stone powder technology, applied in chemical instruments and methods, earthwork drilling, wellbore/well components, etc., can solve the problems of inability to form an overall blockage body and insufficient blockage strength, and achieve high pressure bearing capacity, Improve the success rate and anti-breaking ability, improve the effect of matching ability

Inactive Publication Date: 2014-01-01
CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] In order to solve the above technical problems, the present invention proposes a stone powder plugging method. This method can ensure that stone powder and plugging materials of different grades can enter the leakage layer and stay there, and the formed plugging has high overall strength and can form Good plugging overall, which solves the problem of insufficient blockage strength in the prior art and cannot form an overall blockage body, greatly improving the plugging success rate and burst resistance

Method used

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  • Mountain flour plugging method

Examples

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Effect test

Embodiment 1

[0031] The invention discloses a stone powder composite bridge plug plugging method. The stone powder composite bridge plug plugging slurry is prepared through a drilling fluid mixing tank, which is composed of A high fluid loss agent XHD, B stone powder, C bridging agent and water, wherein , high fluid loss agent accounts for 14-20% of the total water weight, stone powder accounts for 50-100% of the total water weight, and bridging agent accounts for 10-15% of the total water weight. The volume of the slurry mixing tank is generally 30-40m3, put two-thirds of the total amount of clean water in the slurry mixing tank, and start the agitator on the slurry mixing tank at the same time, and the drilling pump circulates through the hydraulic mixing funnel tank with a displacement of 1.8 cubic meters per minute According to the feeding sequence of A, B and C, prepare in the hydraulic mixing funnel. After the preparation, the plugging slurry should be put into the well as soon as pos...

Embodiment 2

[0038] Prepare stone powder composite bridge plug plugging slurry through the slurry mixing tank of drilling fluid, the volume of the mixing slurry tank is 30-40m 3 , put two-thirds of the total amount of clean water in the mud mixing tank, and start the agitator on the mud mixing tank at the same time, and the drilling pump circulates in the mud mixing tank through the hydraulic mixing funnel with a displacement of 1.8 cubic meters per minute. Add fluid loss agent, accounting for 14-20% of the total water weight, add stone powder, accounting for 50-100% of the total water weight, and finally add bridging agent, accounting for 10-15% of the total water weight. , After the preparation, the plugging slurry should be put into the well as soon as possible. If the time exceeds 4 hours, the stratification is serious and partly solidified.

Embodiment 3

[0040]On the basis of Example 2, the bare drill pipe is lowered to 10-30 meters above the leakage zone, and the internal volume of the drilling tool is calculated, and the leakage plugging slurry in the tank is evenly pumped by the drilling pump at a speed of 1.8 cubic meters per minute. Plugging slurry. Measure the amount of plugging slurry entering the well and the amount of drilling fluid returning out of the tank every minute, and calculate the loss.

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Abstract

The invention discloses a mountain flour plugging method and particularly relates to the field of petroleum drilling. In the method disclosed by the invention, plugging slurry for a mountain flour composite bridge plug is prepared by utilizing a proportioning tank filled with a drilling fluid; the plugging slurry in a funnel tank is mixed through water power to be circularly prepared by utilizing a drilling pump with the discharge capacity of 1.8 squares / minute; a naked drill rod descends to 10-30 meters at the top of a leakage layer; the plugging slurry in the tank is uniformly pumped through the drilling pump at the speed 1.8 squares / minute; and a large quantity of plugging slurry enters the leakage layer to reach pressure bearing requirements in a well-close extrusion mode. The method disclosed by the invention can ensure that different grades of mountain flour and plugging materials can enter the leakage layer and can be maintained; the intensity of a formed plugging object integrate is high; a better plugging integrate can be formed; and the condition that an integral plugging body cannot be formed because the existing plugging intensity in the prior art is insufficient is better solved, thereby enabling the plugging success rate and the crush resistance to be greatly improved.

Description

technical field [0001] The invention relates to the technical field of petroleum drilling, in particular to a stone powder composite bridge plugging method. Background technique [0002] With the large-scale development of oil and gas fields in the Ordos Basin, there will be more and more horizontal wells. However, there are leakage zones in the Yanchang and Liujiagou Formation in the northern Shaanxi block and the Sulige block. In order to stabilize the wellbore in the deviated section of the horizontal well, it is necessary to increase the density to stabilize the wellbore. The density should be increased to 1.25g / cm3. The improvement increases the probability and difficulty of leakage. [0003] Due to the long and many lost intervals, especially after the drilling fluid density increases, the Yanchang Formation and Liujiagou Formation are prone to loss. The lost intervals are long, and some wells have lost intervals as long as hundreds of meters, and there is no fixe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B33/13C09K8/42
Inventor 吴付频张建卿陈华张健刘乃春
Owner CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD
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