| (19) |
 |
|
(11) |
EP 0 562 879 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
02.03.1994 Bulletin 1994/09 |
| (43) |
Date of publication A2: |
|
29.09.1993 Bulletin 1993/39 |
| (22) |
Date of filing: 26.03.1993 |
|
|
| (84) |
Designated Contracting States: |
|
DE DK FR GB NL SE |
| (30) |
Priority: |
27.03.1992 GB 9206780
|
| (71) |
Applicant: HEPWORTH MINERALS & CHEMICALS LIMITED |
|
Sandbach
Cheshire CW11 0SS (GB) |
|
| (72) |
Inventors: |
|
- Meredith, William Clive Stening
Norfolk PE31 8NF (GB)
- Loose, Peter James
Staithe
Norfolk (GB)
|
| (74) |
Representative: Harrison, Gordon Donald et al |
|
FORRESTER & BOEHMERT
Franz-Joseph-Strasse 38
80801 München
80801 München (DE) |
|
| |
|
| (54) |
Method of sustaining fractures radiating from a well bore and compositions for use
in the method |
(57) There is introduced into fractures radiating from a well bore proppant grains coated
with a resin composition. The grains are suspended in a gell which includes a breaker
for the gell. The resin composition is covered by a protective layer which is less
reactive with respect to the breaker than is the resin composition.