Sidepocket mandrel apparatus and methods
First Claim
1. A sidepocket mandrel apparatus, comprising:
- a mandrel body formed of a resin-based material, the mandrel body defining a through-bore and an enlargement axially offset from the through-bore; and
a valve receiving pocket formed of a rigid material and secured within the offset enlargement of the mandrel body so as to be substantially parallel to but axially offset from said through-bore.
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Accused Products
Abstract
A sidepocket mandrel apparatus including a mandrel body formed of a resin-based material, such as, for example, fiberglass. The mandrel body defines a through-bore and an enlargement axially offset from the through-bore. A valve receiving pocket formed of a rigid material is secured within the offset enlargement of the mandrel body so as to be substantially parallel to but axially offset from said through-bore. Such pocket may, for example, be formed of stainless steel or of a composite plastic material.
The sidepocket mandrel is formed by machining a valve receiving pocket from a rigid material. The valve receiving pocket is removably secured on a substantially cylindrical molding rod, together with at least one removable mold piece, the molding rod and removable mold pieces defining a desired inner shape of the sidepocket mandrel. Fiberglass is then wound around the valve receiving pocket, molding rod, and removable mold pieces to form a fiberglass mandrel body. The molding rod and mold pieces are removed from the fiberglass mandrel body, the fiberglass is cured, and the fiberglass is thereafter machined to form threads adjacent each end of the mandrel body.
21 Citations
21 Claims
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1. A sidepocket mandrel apparatus, comprising:
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a mandrel body formed of a resin-based material, the mandrel body defining a through-bore and an enlargement axially offset from the through-bore; and a valve receiving pocket formed of a rigid material and secured within the offset enlargement of the mandrel body so as to be substantially parallel to but axially offset from said through-bore. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A sidepocket mandrel apparatus, comprising:
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a mandrel body formed of a fiberglass material, the mandrel body defining a substantially linear through-bore and an enlargement axially offset from the through-bore; and a valve receiving pocket formed of a rigid material and secured within the offset enlargement of the mandrel body so as to be substantially parallel to but axially offset from said through-bore. - View Dependent Claims (11, 12, 13, 14)
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15. A method for producing a sidepocket mandrel, the method comprising the steps of:
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machining a valve receiving pocket from a rigid material; removably securing the valve receiving pocket on a substantially cylindrical molding rod; securing at least one removable mold piece on the molding rod adjacent the valve receiving pocket, said molding rod and removable mold pieces defining a desired inner shape of the sidepocket mandrel; winding fiberglass around the valve receiving pocket, molding rod, and removable mold pieces to form a fiberglass mandrel body; removing the molding rod and mold pieces from the fiberglass mandrel body; curing the fiberglass; and machining the fiberglass to form threads adjacent each end of the mandrel body. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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Specification