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A wash fluid for drilling into a field

Patent:

Abstract

A wash fluid is proposed, used in drilling wells in water and a content of 3-5% by weight starch products. To speed up destruction of the starch products, to the fluid are added amylolytic enzymes in the amount of 0.01-0.1 percent by weight of the starch products' weight. To lower the use of starch products, up to 3% clay can be added to the fluid. The wash fluid is prepared directly at the work site. Dry powder of modified starch is mixed with cold water until a colloidal solution is obtained. Such a wash fluid preserves the required structural-mechanical properties for 3-5 days, which ensures prompt drilling into the waterbearing layer and installation of the filter. Then, during the work process, 5-6 hours before the moment required for lowering the viscosity, to the wash fluid is added the amylolytic enzyme; under its influence, the starch molecules split up, and the viscosity drops sharply. Using this wash fluid enables a reduction in well construction times from the beginning of drilling to the end of development of the water-bearing layer, and a rise in outputs and well service lives by reducing sedimentation of the water-bearing formation and elimination of down times during  More>>
Publication Date:
Jan 18, 1979
Product Type:
Patent
Report Number:
SU 2165709
Reference Number:
EDB-83-146806
Resource Relation:
Patent File Date: Filed date 22 Jul 1975; Other Information: PAT-APPL-642352
Subject:
02 PETROLEUM; 03 NATURAL GAS; DRILLING FLUIDS; CHEMICAL COMPOSITION; CHEMICAL PREPARATION; CLAYS; ENZYMES; QUANTITY RATIO; SEDIMENTATION; STARCH; VISCOSITY; WASHING; WELL COMPLETION; WELL DRILLING; CARBOHYDRATES; CLEANING; DRILLING; FLUIDS; ORGANIC COMPOUNDS; POLYSACCHARIDES; REAGENTS; SACCHARIDES; SYNTHESIS; 020300* - Petroleum- Drilling & Production; 030300 - Natural Gas- Drilling, Production, & Processing
OSTI ID:
6000622
Country of Origin:
USSR
Language:
Russian
Availability:
Plenum Publishing Corp., New York, NY.
Submitting Site:
HEDB
Size:
Pages: v
Announcement Date:

Patent:

Citation Formats

Belyakov, V M, Badzhurak, R F, Koptelova, Ye K, Rogovoy, V K, and Sapozhnikov, N G. A wash fluid for drilling into a field. USSR: N. p., 1979. Web.
Belyakov, V M, Badzhurak, R F, Koptelova, Ye K, Rogovoy, V K, & Sapozhnikov, N G. A wash fluid for drilling into a field. USSR.
Belyakov, V M, Badzhurak, R F, Koptelova, Ye K, Rogovoy, V K, and Sapozhnikov, N G. 1979. "A wash fluid for drilling into a field." USSR.
@misc{etde_6000622,
title = {A wash fluid for drilling into a field}
author = {Belyakov, V M, Badzhurak, R F, Koptelova, Ye K, Rogovoy, V K, and Sapozhnikov, N G}
abstractNote = {A wash fluid is proposed, used in drilling wells in water and a content of 3-5% by weight starch products. To speed up destruction of the starch products, to the fluid are added amylolytic enzymes in the amount of 0.01-0.1 percent by weight of the starch products' weight. To lower the use of starch products, up to 3% clay can be added to the fluid. The wash fluid is prepared directly at the work site. Dry powder of modified starch is mixed with cold water until a colloidal solution is obtained. Such a wash fluid preserves the required structural-mechanical properties for 3-5 days, which ensures prompt drilling into the waterbearing layer and installation of the filter. Then, during the work process, 5-6 hours before the moment required for lowering the viscosity, to the wash fluid is added the amylolytic enzyme; under its influence, the starch molecules split up, and the viscosity drops sharply. Using this wash fluid enables a reduction in well construction times from the beginning of drilling to the end of development of the water-bearing layer, and a rise in outputs and well service lives by reducing sedimentation of the water-bearing formation and elimination of down times during work required while waiting for destruction of the starch wash fluid under natural conditions.}
place = {USSR}
year = {1979}
month = {Jan}
}