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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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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the field implementation of conventional bridging plugging methods, the plugging success rate is only 40% to 60%. The main reasons are as follows: 1. The size of the crack opening in the leakage 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 will hinder the entry of smaller materials and form a bridge plug, which is blocked on the surface. Under the action of collision, liquid flow scouring, tripping and pulling, and tripping and suction, the large particle material of the sealed door is separated from the crack, and another leakage occurs
[0003] Therefore, in drilling engineering, sometimes because the fracture width and pore size of the lost formation cannot be accurately grasped, the formulation of the plugging agent cannot be optimized and determined, which increases the uncertainty of successful construction and reduces the success rate of plugging
Moreover, due to the existence of more plugging materials, not only the viscosity is too high, which is not conducive to pumping, the actual application value of on-site construction is lost, but also the on-site labor intensity is increased.

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
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1 (performance evaluation of anti-high pressure leakage plugging agent of the present invention)

[0020] The anti-high pressure plugging agent in this example 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%, 31.5% of 10-mesh walnut shell powder, 7.3% of 10-mesh vermiculite, 2.3% of 10-mesh peanut shell powder, 22.3% of cement and 10.6% of flocculation coating agent LHB-105 for drilling fluid to prepare anti-high pressure plugging agent, mix and stir evenly 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 still, the method of measuring the consistency every two hours was used for the experiment. The formula for the thickening experiment is as follows...

Embodiment 2

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

[0069] Mix plugging slurry according to needs, add the anti-high pressure plugging agent in every 100 milliliters of base slurry to 4 g%, add the composite plugging agent FDJ to 6 grams, add the described while drilling plugging agent SDL to 5 gram. The anti-high pressure plugging agent is composed of soybean granules, walnut shell powder, vermiculite, peanut shell powder, cement and drilling fluid flocculation coating agent LHB-105, and the mass percentage is: 10 mesh soybean granules 26%, 10 31.5% of purpose walnut shell po...

Embodiment 3

[0072] A well was drilled down to a depth of 3499.67m on December 8, 2006 and encountered obstruction. The pump was turned on to remark and the drilling fluid density was 1.42g / cm 3 . Due to the relatively serious well collapse in the underground, it is very difficult to draw the hole. In order to control downhole collapse, the drilling fluid density was increased to 1.46g / cm 3 Afterwards, lost circulation was found by reaming in the interval to a well depth of 3724.30m, and continued reaming to a depth of 3729.50m. The wellhead lost its return, and the drill was tripped out with plugging slurry.

[0073] Prepare plugging slurry as needed, add 3 grams of the anti-high pressure plugging agent, 9 grams of the composite plugging agent FDJ, and 3 grams of the drilling-while-drilling plugging agent SDL per 100 ml of base slurry . The anti-high pressure plugging agent is composed of soybean particles, walnut shell powder, vermiculite, peanut shell powder, cement and drilling flui...

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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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