Impervious blocking agent

A plugging agent and non-permeable technology, which is applied in the direction of drilling composition, chemical instruments and methods, etc., can solve problems such as aggravating oil layer pore blockage, oil layer pore damage, and affecting oil production, achieving significant plugging effect and retention Temporary plugging, reducing the effect of excessive water loss

Inactive Publication Date: 2013-05-22
DAQING HEZHENG CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Drilling fluid is the blood of drilling and a necessary working fluid in drilling, but the drilling fluid will cause damage to the pores of the oil layer. When drilling the oil and gas layers, the fine particles in the drilling fluid such as bentonite particles, finer barite powder particles, The finer drill cuttings particles will invade deep into the pores and cracks to block the pores and cracks. This effect is harmful to the formation containing oil or natural gas. After the fine particles enter the pores of the oil layer, they will accumulate and block the pores, making the oil unable to circulate. Exploitation of oil; the deeper the fine particles enter the pores of the formation, the greater the damage to the oil formation; in addition, the water and chemicals that penetrate into the pores of the oil formation will cause the mud shale particles and clay or mudstone in the formation to be damaged. Soaking and swelling aggravate the clogging of the pores of the oil layer; in addition, the water that penetrates into the pores sometimes forms a water lock to block the pores of the oil layer so that the oil cannot flow

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Select 40g of superfine calcium carbonate powder with a particle size range of 800-1250 mesh as the accumulation material, and select 60g of wollastonite fibers with a diameter range of 5-20 microns and an aspect ratio of 3-20 as bridging reinforcement materials. A product is obtained by mixing the materials evenly. The plugging agent can plug the oil layer pores of 10-40 microns.

Embodiment 2

[0014] Select 50g of superfine calcium carbonate powder with a particle size range of 300-500 mesh as the accumulation material, select 30g of wollastonite fiber with a diameter range of 10-30 microns and an aspect ratio of 3-20 as a bridging reinforcement material, and select a diameter range 10-30 microns and 5g of poplar wood fibers with an aspect ratio of 3-20, 10g of plant glue-soaked nanmu powder, 5g of diluent JN-A, and uniformly mixing the above materials to obtain the product. The plugging agent can plug micro-cracks and pores of 30-80 microns.

Embodiment 3

[0016] Select 50g of superfine calcium carbonate powder with a particle size range of 200-400 mesh as the accumulation material, select 40g of wollastonite fiber with a diameter range of 80-200 microns and an aspect ratio of 3-20 as the bridging reinforcement material, and select the diameter range The product is prepared by mixing the above materials evenly with 10g of poplar wood fibers with a micron size of 100-200 and an aspect ratio of 3-20. The plugging agent can plug micro-cracks of 150-300 microns.

[0017] Verify the non-permeable plugging agent in the above Example 3: select 40-60 mesh quartz sand to simulate the size of pores and micro-cracks, use a special instrument for oil drilling to test the plugging effect, and use the quartz sand After drying, put it into a transparent quartz glass test tube with a height of 150-200mm and compact it. Prepare the drilling fluid according to the weight ratio of water: bentonite = 1000:80-100, then add 5% of the sample to the p...

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Abstract

The invention relates to an impervious blocking agent, and belongs to the technical field of oilfield drilling. The impervious blocking agent comprises the following components in percentage by weight: 40-80% of superfine calcium carbonate, 20-60% of fiber material, 0-10% of vegetable glue and 0-10% of diluter. With the adoption of the impervious blocking agent, the filter loss of drilling fluid can be reduced, the pore space of an oil layer is blocked, an oil gas layer is protected, and the sealing quality of a micro-crack oil layer and high-permeability oil layer well cementation is improved.

Description

Technical field [0001] The invention involves a blocking agent in the field of oil field drilling technology, especially a non -penetrating blocking agent. Background technique [0002] In the process of oil and natural gas drilling, in order to carry the needs of drilling rock chips, lubrication and cooling drills, and balanced strata pressure, a drilling fluid should be used.Drilling liquid is composed of pussy soil, water, chemical additives, aggravated materials (such as heavy crystal powder), and rock particles drilled out.During drilling, the drilling fluid plays a very important role. The drilling solution can also prevent the strata from collapsed. By losing water to the strata, a layer of filter cake is formed on the wall of the well to protect the well.Drilling liquid is the blood of drilling, a necessary working solution in the drilling, but the drilling fluid will cause damage to the pores of the oil layer. When drilling the oil and gas layer, the fine particles in th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/42
Inventor 刘志文高玉华
Owner DAQING HEZHENG CHEM
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