Efficient-dehydration lost circulation additive

A plugging agent, high fluid loss technology, applied in drilling compositions, chemical instruments and methods, etc., can solve the problems of aging resistance, sticking, waste of drilling fluid, etc., and achieve high mechanical strength and pressure bearing capacity. High, good blocking effect

Inactive Publication Date: 2015-04-29
CNPC BOHAI DRILLING ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The above-mentioned Chinese patent 201110261289.9 contains solidified materials such as cement in the plugging agent, and the formed plugging layer is very strong. Not only does it need to drill the plug, which wastes drilling time, but also the cement pollutes the drilling fluid, resulting in a waste of drilling fluid, and may occur during drilling construction. "Stuck drill" accident
In the above-mentioned Chinese patent 201210564469.9, the fibers in the plugging agent are selected from one or both of wood chips and paper chips. The fiber material is easy to deteriorate and mold in the formation, and is not anti-aging. The formed packing layer cannot permanently seal the leaky layer, resulting in another missing

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] 60kg of 600-100 mesh calcium carbonate, 15kg of 200-320 mesh gypsum, 5kg of 0.075-0.85mm carbon fiber, 14kg of 0.1-1mm asbestos powder, 5kg of 20-60 mesh marble particles, 1kg of 1-6mm polypropylene fiber.

Embodiment 2

[0014] 200-325 mesh quicklime 65kg, 50-200 mesh graphite powder 10kg, 0.075-0.85mm carbon fiber 3kg, montmorillonite 12kg, 20-60 mesh calcite particles 7kg, 1-6mm polyurethane fiber 3kg.

Embodiment 3

[0016] Main material 70kg, filter aid 10kg, 0.075-0.85mm carbon fiber 3kg, suspending agent 10kg, bridging material 5kg, fiber material 2kg, the main material is 70% 600-100 mesh calcium carbonate and 30% 200-325 mesh The mixture of quicklime, the filter aid is a mixture of 40% 200-320 mesh gypsum and 60% 50-200 mesh graphite powder, the suspending agent is a mixture of 30% montmorillonite and 70% 0.1-1mm asbestos powder, The bridging material is a mixture of 40% 20-60 mesh marble particles and 60% 20-60 mesh calcite particles, and the fiber material is a mixture of 60% 1-6mm polypropylene fibers and 40% 1-6mm polyurethane fibers.

[0017] All the above examples are prepared by a mixer. After mixing the plugging materials, add 25 parts (weight) of the plugging agent to every 100 parts (weight) of clean water and mix well, then perform performance evaluation, see Table 1-3.

[0018] performance evaluation

[0019] 1. Dehydration

[0020] Rapid water loss and high fluid loss a...

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PUM

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Abstract

The invention relates to an efficient-dehydration lost circulation additive, which comprises the following components in percentage by weight: 60%-70% of a main body material, 10%-15% of a filter aid, 3%-5% of a carbon fiber, 10%-15% of a suspending agent, 5%-8% of a bridge material and 1%-3% of a net fiber material. The raw materials are mixed evenly to form the efficient-dehydration lost circulation additive. The lost circulation additive has the characteristics of high loading capacity, good aging resistance, good plugging property and the like, can be aggravated by barite powder, and can be used for solving the problem of porous or fractured non-reservoir and reservoir losses.

Description

technical field [0001] The invention relates to the technical field of oil drilling engineering plugging, in particular to a high-efficiency filter loss plugging agent. Background technique [0002] Lost circulation is a complex downhole situation in which various working fluids flow into the formation under the action of pressure difference during various downhole operations such as drilling, cementing, testing or workover. The occurrence of lost circulation not only consumes drilling time and loss of drilling fluid, but also may cause a series of complex situations such as pipe sticking, blowout, and well collapse. In severe cases, the wellbore will be scrapped and cause major economic losses. The commonly used plugging material is bridging plugging material. The main disadvantage of bridging plugging materials is that it is difficult to reasonably match the particle size of the plugging agent with the pore throat diameter of the lost formation when the size of the underg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/467
CPCC09K8/48C09K8/426C09K2208/08
Inventor 侯士立黄达全刘光艳王伟忠田增艳王禹刘强马艺飞
Owner CNPC BOHAI DRILLING ENG
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