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Temporary blocking agent for hydrocarbon reservoir crack

A technology for oil and gas reservoirs and temporary plugging agents, which is applied in drilling compositions, chemical instruments and methods, etc., can solve the problems of poor temporary plugging pertinence, narrow temporary plugging range, and low temporary plugging rate, etc. The effect of shielding temporary blocking, wide temporary blocking range, and small addition amount

Inactive Publication Date: 2008-11-26
浙江仁智股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its disadvantages are that it cannot effectively temporarily plug the situation where the geological conditions are complex, the fracture voids and throats are significantly different, and the fracture development is uneven. The temporary plugging is not targeted, the temporary plugging rate is low, and the temporary plugging range is narrow.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Embodiment 1, oil and gas reservoir fracture temporary plugging agent is produced according to the following proportioning and process:

[0012] (1) 15% of 1000 order calcium carbonate, 10% of 600 order calcium carbonate, 15% of 400 order calcium carbonate, 20% of 100 order calcium carbonate, and 5% of 60 order calcium carbonate are mixed in the reactor, stirred for 1~2 hours, The temperature is controlled at 20-40°C.

[0013] (2) Add 20% of plant fibers smaller than 2mm into (1) and mix evenly, stir for 0.5-1 hour, and control the temperature at 20-40°C.

[0014] (3) Mix and disperse 15% oxidized asphalt into (2) uniformly and stir for 0.5-1 hour, and control the temperature at 20-40°C.

[0015] The performance index of the temporary plugging agent gained in the present embodiment is as follows after testing:

[0016] project

Embodiment 2

[0017] Embodiment 2: The oil and gas reservoir fracture temporary plugging agent is produced according to the following proportions and industrial production:

[0018] (1) 15% of 1000 order calcium carbonate, 5% of 600 order calcium carbonate, 20% of 400 order calcium carbonate, 10% of 100 order calcium carbonate, 15% of 60 order calcium carbonate. Mix in the reaction kettle and stir for 1 to 2 hours.

[0019] (2) Add 15% plant fiber into (1) and mix evenly, and stir for 0.5-1 hour.

[0020] (3) Mix and disperse 20% oxidized asphalt into (2) evenly and stir for 0.5-1 hour.

[0021] The performance index of the temporary plugging agent gained in the present embodiment is as follows after testing:

[0022] project

[0023] The present invention is actually applied in Well 565 of Chuanxiao Well and Well of Chuanjiang 566. After adding the fracture temporary plugging agent of the present invention, it has a good leak prevention and plugging effect, and there are no do...

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PUM

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Abstract

The invention relates to a hydrocarbon zone protective agent specific to fractured hydrocarbon zone in oil and gas drilling, in particular to a fractured temporary plugging additive, which is mixed by the components with the following mixture ratio: 40-85 percent of 60-1100 meshes of calcium carbonate superfine powder, 10-40 percent of plant fibers and 5-20 percent of oxidized asphalt. After the temporary plugging additive of the invention enters the stratum with the drillingfluid, a layer of compact and tenacious mud cake is quickly formed near the well wall for ensuring the original permeability of the stratum near the well wall to rapidly reduce to be nearly zero, thus preventing the intrusion of drilling fluid filter, various finishing agents, rock debris and the like which causes the reduction of oil and gas yield and capacity. The temporary plugging additive of the invention reaches more than 99 percent of temporary plugging rate to fractured core and more than 80 percent of pressure flowback and acidification flowback rate. Furthermore, the temporary plugging additive is characterized by wild temporary plugging range, little dosage, low cost and no pollution, thus being an ideal hydrocarbon zone protective agent.

Description

(1) Technical field [0001] The invention is an oil and gas layer protection agent for fractured oil and gas reservoirs in oil and gas drilling. (2) Background technology [0002] With the increase of the world's energy demand and the development of drilling technology, it is inevitable to continuously improve energy production and recovery. For fractured oil and gas reservoirs, when drilling into fractures, drilling fluid filtrate, various treatment agents, cuttings, etc. invade deeper formations, which will cause the permeability of the reservoir to decrease, resulting in a decrease in oil and gas production and productivity. Therefore, storage protection should be implemented in the drilling of fractured oil and gas reservoirs. At present, superfine calcium carbonate is generally used as a temporary plugging agent for oil and gas reservoirs as reservoir protection agent. Its disadvantages are that it cannot be effectively temporarily blocked in the case of complex geolog...

Claims

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Application Information

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IPC IPC(8): C09K8/516
Inventor 张军汪建军温银武杨飞罗健生段春兰林科君周雪刘大海
Owner 浙江仁智股份有限公司
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