Matrix treatment employs new acid system for stimulation and control of fines migration in sandstone formations

Conference · Sun Jan 01 04:00:00 EST 1978 · Soc. Pet. Eng. AIME, Pap.; (United States)

OSTI ID:6638265

Thomas, R L; Crowe, C W

A new retarded acid system, employing fluoboric acid (HBF/sub 4/), has been developed to stimulate problem sandstone formations. This treatment is designed to overcome a commonly observed problem in which wells initially respond to matrix acidizing but show rapid production declines following treatment. These rapids declines are generally attributed to migration of clays and other fines. The fluoboric acid slowly hydrolyzes to generate hydrofluoric acid (HF). The HBF/sub 4/ system reacts more slowly than conventional mud acid and, thus, penetrates a greater distance into the formation before spending. The HBF/sub 4/ also acts to stabilize clays and other fines by chemically fusing them to each other and to the sand grains. As a result, fines are stabilized against dispersion by incompatible fluids and mechanical dislodgment. The effectiveness of this stimulation and clay control method is demonstrated by core test studies. The control mechanism is illustrated by scanning electron microscope (SEM) studies and X-ray analysis of treated clays.Field tests demonstrate the effectiveness of this treatment for increasing production and controlling fines migration. (17 refs.)

• Research Organization: Dowell Div Dow Chemical Co
• OSTI ID: 6638265
• Report Number(s): CONF-781003-
• Conference Information: Journal Name: Soc. Pet. Eng. AIME, Pap.; (United States) Journal Volume: SPE-7566
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
ACIDIZATION
ADDITIVES
CLAYS
ENHANCED RECOVERY
FIELD TESTS
MIGRATION
OIL WELLS
RECOVERY
STIMULATION
TESTING
WELL STIMULATION
WELLS