High pressure-resistant leak stoppage agent and leak stoppage slurry containing same

A plugging agent, anti-high pressure technology, applied in the field of plugging agents, can solve the problems of small particle size of plugging materials, reducing the success rate of plugging, small crack opening size, etc., to achieve high plugging capacity and pressure bearing capacity, improve The success rate of plugging and the effect of improving the effect of plugging

Active Publication Date: 2011-01-26
北京奥凯立科技发展股份有限公司
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the field implementation of the conventional bridging plugging method, the plugging success rate is only 40% to 60%. The main reasons are as follows: 1. The size of the crack opening in the leaking layer is large, and the particle size of the plugging material is small. In particular, the particle size of the hard particle material is small, so it is difficult to form bridges in the cracks
2. The size of the fracture opening is small. When bridging and plugging, the large particle material will form a door-sealing phenomenon at the crack opening, which hinders the entry of smaller materials and forms a bridge plug, which is blocked on the surface. Under the action of collision, liquid flow scourin

Method used

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  • High pressure-resistant leak stoppage agent and leak stoppage slurry containing same
  • High pressure-resistant leak stoppage agent and leak stoppage slurry containing same
  • High pressure-resistant leak stoppage agent and leak stoppage slurry containing same

Examples

Experimental program
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Effect test

Example Embodiment

[0019] Example 1 (Evaluation of the performance of the anti-high pressure plugging agent of the present invention)

[0020] The anti-high pressure plugging agent of this embodiment is composed of soybean particles, walnut shell powder, vermiculite, peanut shell powder, cement and drilling fluid flocculation coating agent LHB-105, and the mass percentage is: 10 mesh soybean particles 26%, The ratio of 10 mesh walnut shell powder 31.5%, 10 mesh vermiculite 7.3%, 10 mesh peanut shell powder 2.3%, cement 22.3% and drilling fluid flocculation coating agent LHB-10510.6% are prepared as an anti-high pressure plugging agent. Mix and stir well Then perform the following performance evaluation:

[0021] 1. Thickening experiment

[0022] The experiment was carried out on a cement slurry thickening instrument. Because the experiment needs to be static, the experiment was carried out by measuring the consistency every two hours. The thickening experiment formula is as follows:

[0023] 1#: 6% hyd...

Example Embodiment

[0067] Example 2

[0068] A well was drilled to a cementing depth of 4190m on December 31, 2006. After electrical surveys, the borehole was drilled with a centralizer and the hole was drilled to a depth of 3887.10m and lost circulation (drilling fluid density 1.50g / cm) 3 ), the average leakage velocity is 24m 3 / h, continue to draw to the depth of the well 3890.48m, the wellhead will return, and the drilling will be plugged with plugging slurry.

[0069] According to the need to prepare plugging slurry, the added anti-high pressure plugging agent is 4 g% per 100 milliliters of base slurry, the compound plugging agent FDJ is 6 grams, and the SDL of the sealing while drilling agent is 5 Grams. The anti-high pressure plugging agent is composed of soybean particles, walnut shell powder, vermiculite, peanut shell powder, cement and drilling fluid flocculation coating agent LHB-105, and the mass percentage is: 10 mesh soybean particles 26%, 10 The target walnut shell powder is 31.5%, 10...

Example Embodiment

[0071] Example 3

[0072] A well was drilled down to a depth of 3499.67m on December 08, 2006, and encountered resistance. The pump was started and the drilling fluid density was 1.42g / cm. 3 . Due to the serious collapse of the well, it is very difficult to delineate the hole. In order to control the downhole collapse, the density of the drilling fluid was increased to 1.46g / cm 3 Later, the borehole was cut to the depth of 3724.30m and the leak was found, and the hole was cut to the depth of 3729.50m, the wellhead was lost, and the drilling was stopped with plugging slurry.

[0073] Mixing plugging slurry according to needs, adding the anti-high pressure plugging agent to each 100 ml of base slurry is 3 grams, adding the composite plugging agent FDJ is 9 grams, and adding the MWD plugging agent SDL is 3 grams . The anti-high pressure plugging agent is composed of soybean particles, walnut shell powder, vermiculite, peanut shell powder, cement and drilling fluid flocculation coati...

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Abstract

The invention relates to a high pressure-resistant leak stoppage agent and leak stoppage slurry containing the same. The high pressure-resistant leak stoppage agent consists of the following components in percentage by mass: 25.0 to 27.0 percent of soybean particles, 31.0 to 32.0 percent of walnut shell flour, 7.1 to 7.5 percent of vermiculite, 2.1 to 2.5 percent of peanut hull meal, 22.0 to 22.5percent of cement and 10.0 to 11.0 percent of flocculation coating agent LHB-105 for drilling fluid. The leak stoppage slurry consists of base slurry and the high pressure-resistant leak stoppage agent, wherein 3 to 9 grams of high pressure-resistant leak stoppage agent is added into every 100 milliliters of base slurry. The leak stoppage agent and the leak stoppage slurry stop leaking by combining chemical leak stoppage with particle bridging leak stoppage, so that the technical problems of aperture leak, crack leak and fracture leak under a well can be solved. The leak stoppage agent and the leak stoppage slurry are suitable for severe well leakage caused by a pore formation, a crack formation, a long-section broken formation and the like and can be applied to leak layer construction ofwhich the leak position is difficultly determined.

Description

technical field [0001] The invention relates to a lost circulation agent used in petroleum exploration and drilling, in particular to a high-pressure anti-high pressure lost circulation agent and a lost circulation slurry containing the anti-high pressure lost circulation agent. Background technique [0002] Lost circulation exists to varying degrees in the process of oil and gas drilling in China, especially when drilling in fractured formations. Therefore, it is necessary to implement effective drilling leakage prevention and plugging technology, and the indispensable basic substance for implementing this technology is the plugging material. At present, the most widely used and low-cost plugging material is bridging plugging. During the field implementation of the conventional bridging plugging method, the plugging success rate is only 40% to 60%. The main reasons are as follows: 1. The size of the crack opening in the leaking layer is large, and the particle size of the ...

Claims

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Application Information

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IPC IPC(8): C09K8/467
Inventor 冯素敏韩晓华王铁林周文欣卢胜娟
Owner 北京奥凯立科技发展股份有限公司
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