SECURITIES AND EXCHANGE COMMISSION
                              Washington, DC 20549



                                    FORM 8-K



                             Current Report Pursuant
                          to Section 13 or 15(d) of the
                         Securities Exchange Act of 1934



    Date of report (Date of earliest event reported)        April 8, 2002
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                               UNOCAL CORPORATION
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             (Exact name of registrant as specified in its charter)



                                    Delaware
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                 (State or Other Jurisdiction of Incorporation)



    1-8483                                   95-3825062
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(Commission File Number)                (I.R.S. Employer Identification No.)



2141 Rosecrans Avenue, Suite 4000, El Segundo, California         90245
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(Address of Principal Executive Offices)                       (Zip Code)



                                 (310) 726-7600
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              (Registrant's Telephone Number, Including Area Code)



Item 5.           Other Events.

Unocal tests Ranggas oil discovery on deepwater Rapak PSC offshore Indonesia
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Unocal   Corporation   announced  that  its  Unocal  Rapak,   Ltd.,   subsidiary
successfully  tested  an  appraisal  well in the  deepwater  Ranggas  oil  field
offshore Indonesia. The Ranggas-4 appraisal well flowed at a daily rate of 8,158
barrels of oil and 6.4 million cubic feet of gas from a single interval  between
10,174 feet and 10,224 feet true vertical depth subsea (TVD). The drillstem test
had  flowing  tubing  pressure of 1,223  pounds per square inch on a  56/64-inch
choke.

The Ranggas-4  well  encountered  181 feet of net oil pay and 57 feet of net gas
pay. The well was drilled in 5,208 feet of water to 11,252 feet TVD. The well is
located 2.4 miles north of the Ranggas-1  discovery  well and 1.2 miles south of
the  Ranggas-3  appraisal  well.  The test  results are another step towards the
future possible  commercialization of the Company's third deepwater oil field in
Indonesia.  The company plans to spud the Ranggas-5  appraisal well, also on the
main Ranggas structure, before the end of April 2002.

Two wells were  drilled  recently to test  structures  on both the north and the
west parts of the large  central  Ranggas  prospect.  The Ranggas  Utara-1  well
encountered  33 feet of net oil pay and 44 feet of net gas  pay.  The  well  was
drilled in 5,258 feet of water to 12,650 feet TVD. The well is located 2.5 miles
north of the Ranggas-3 well. This  accumulation was deemed  sub-commercial as an
independent  development  at this time,  but it  demonstrates  the potential for
additional hydrocarbons to the north of the Ranggas field.

The Ranggas West-1 well encountered 85 feet of net gas pay in two intervals. The
well was  drilled to 9,955 feet TVD in 4,483 feet of water.  The well is located
2.9 miles west of Ranggas-3. This accumulation could most likely be tied back to
the  future  Ranggas  development  facilities  via a  single  subsea  well.  Oil
potential remains in the southern  extension of this trend.  Several  additional
prospects  on trend or  adjacent  to the main  Ranggas  structure  remain  to be
drilled.  This includes the Api prospect where the Api-1 well is currently being
drilled.

Unocal Rapak is operator of the Rapak production-sharing contract area and holds
an 80 percent working  interest.  Under the terms of the PSCs,  Unocal Indonesia
Company and its  affiliates,  including  Unocal Rapak,  Ltd., as  contractors to
Pertamina, the Indonesia national oil company, are entitled to varying shares of
the oil and gas produced from commercial discoveries.

Provision for Environmental Remediation
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The Company  anticipates  that its first quarter 2002 reported net earnings will
include a provision of  approximately  $30 million  ($20 million  after tax) for
additional  reserves for  environmental  remediation.  Substantially  all of the
provision,  which  results  from  the  Company's  regular  quarterly  review  of
remediation  obligations,  relates to formerly operated sites,  sites previously
sold with retained responsibilities and other inactive sites.


Forward-looking  statements  and  estimates  regarding  future  drilling  plans,
possible  development  activities,  and projected  provisions for  environmental
reserves in this filing are based on assumptions about engineering, geophysical,
geological studies, operational, market, competitive, regulatory, environmental,
political and other considerations.  Actual results could differ materially as a
result of factors  discussed  in Unocal 's 2001  Annual  Report on Form 10-K and
subsequent reports.

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Pursuant  to the  requirements  of the  Securities  Exchange  Act of  1934,  the
registrant  has duly  caused  this  report  to be  signed  on its  behalf by the
undersigned, thereunto duly authorized.




                                                 UNOCAL CORPORATION
                                                   (Registrant)




Date:  April 8, 2002                        By:  /s/ JOE D. CECIL
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                                                  Joe D. Cecil
                                                  Vice President and Comptroller

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