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Drilling mortar

Abstract

A method is proposed for producing stable drilling mortar from drilled rock which makes it possible to stabilize the walls of the borehole and to maintain producing horizons of oil and gas wells in an undisturbed state. The proposed drilling mortar includes 5-12 wt.-% dry modified calcium lignosulfonate in the form of a solution containing about 30% dry matter with the addition of 0.1 wt.-% anti-foaming agent consisting of C/sub 19/-C/sub 20/ alcohol dissolved in a light petroleum product; cream of milk with about 10 wt.-% Ca(OH)/sub 2/ in a quantity sufficient for reducing the pH value of the ions down to 10.5; sodium chloride in amounts from 5 mg to 100 ml (aqueous phase); ordinarily used agents for ensuring the necessary density, viscosity, and filterability. For example, the preparation of the drilling fluid begins with the processing under laboratory conditions of lignosulfonic pulp obtained in the production of yeast fodder with the following characteristics: specific density, 1.15 kgf/dm/sup 3/; water content, 67% (according to the Dean and Stark method); pH 4.0. In the vessel is placed 1000 cm/sup 3/ lignosulfonic pulp containing 33% dry matter, and the pulp is heated to 90-95/sup 0/C by means of a water bath.  More>>
Publication Date:
Jan 30, 1979
Product Type:
Patent
Report Number:
RO 77324
Reference Number:
EDB-83-109666
Resource Relation:
Patent File Date: Filed date 18 Jan 1974; Other Information: PAT-APPL-65200
Subject:
03 NATURAL GAS; 02 PETROLEUM; DRILLING FLUIDS; CHEMICAL PREPARATION; NATURAL GAS WELLS; OIL WELLS; BOREHOLES; DRILLING; MORTARS; ROCK DRILLING; STABILIZATION; WALLS; CAVITIES; FLUIDS; SYNTHESIS; WELLS; 030200* - Natural Gas- Reserves, Geology, & Exploration; 020300 - Petroleum- Drilling & Production
OSTI ID:
6034227
Country of Origin:
Romania
Language:
Rumanian
Availability:
Plenum Publishing Corp., New York, NY.
Submitting Site:
HEDB
Size:
Pages: v
Announcement Date:

Citation Formats

Theodorescu, V, and Ditulescu, E. Drilling mortar. Romania: N. p., 1979. Web.
Theodorescu, V, & Ditulescu, E. Drilling mortar. Romania.
Theodorescu, V, and Ditulescu, E. 1979. "Drilling mortar." Romania.
@misc{etde_6034227,
title = {Drilling mortar}
author = {Theodorescu, V, and Ditulescu, E}
abstractNote = {A method is proposed for producing stable drilling mortar from drilled rock which makes it possible to stabilize the walls of the borehole and to maintain producing horizons of oil and gas wells in an undisturbed state. The proposed drilling mortar includes 5-12 wt.-% dry modified calcium lignosulfonate in the form of a solution containing about 30% dry matter with the addition of 0.1 wt.-% anti-foaming agent consisting of C/sub 19/-C/sub 20/ alcohol dissolved in a light petroleum product; cream of milk with about 10 wt.-% Ca(OH)/sub 2/ in a quantity sufficient for reducing the pH value of the ions down to 10.5; sodium chloride in amounts from 5 mg to 100 ml (aqueous phase); ordinarily used agents for ensuring the necessary density, viscosity, and filterability. For example, the preparation of the drilling fluid begins with the processing under laboratory conditions of lignosulfonic pulp obtained in the production of yeast fodder with the following characteristics: specific density, 1.15 kgf/dm/sup 3/; water content, 67% (according to the Dean and Stark method); pH 4.0. In the vessel is placed 1000 cm/sup 3/ lignosulfonic pulp containing 33% dry matter, and the pulp is heated to 90-95/sup 0/C by means of a water bath. To the heated pulp 33 cm/sup 3/ formic acid at a 40-% concentration is added by mixing. The specific temperature of the pulp is maintained in the constant mixing process for two hours. Then the cream of milk containing 10 wt.-% Ca(OH)/sub 2/ is added to raise the pH to 10.5. The cooled product is calcium lignosulfonate. To produce a stable form of the drilling mortar, 750 g clay and 10 g trass gel are added to a vessel containing 1500 cm/sup 3/ fresh water by means of mixing. The resulting dispersed mass remains at rest for 12 hours for purposes of hydration. Then 2 g of an anti-foaming agent dissolved in 6 cm/sup 3/ benzene is introduced to 1000 cm/sup 3/ modified calcium lignosulfonate produced by the above method.}
place = {Romania}
year = {1979}
month = {Jan}
}