摘要:
The embodiments described herein generally relate to a fluid pressure pulse generating apparatus with a primary seal assembly, back up seal assembly and pressure compensation device. The pressure compensation device comprises a membrane support and a longitudinally extending membrane system. The membrane support has a longitudinally extending bore therethrough for receiving a driveshaft of the fluid pressure pulse generating apparatus. The longitudinally extending membrane system comprising a longitudinally extending outer membrane sleeve and a longitudinally extending inner membrane sleeve with the inner membrane sleeve positioned inside the outer membrane sleeve. The membrane system is sealed to the membrane support to allow flexing of the membrane system in response to fluid pressure on either an inner longitudinal surface of the membrane system or an outer longitudinal surface of the membrane system and to prevent fluid on the inner longitudinal surface mixing with fluid on the outer longitudinal surface.
摘要:
By using reactive shaped charges, a dynamic underbalance effect associated with detonation of a perforating system is enhanced without compromising shot density. Fewer shaped charges can be loaded to achieve the same or better effective shot density as a gun fully loaded with conventional shaped charges, thereby increasing the free volume within the gun while creating debris-free tunnels with fractured tips and substantially eliminating the crushed zone surrounding each perforated tunnel. Further, the strength and grade of gun steel required to construct the gun can be reduced without compromising the amount the gun swells following detonation.
摘要:
A downhole pump (24) and perforator gun (54) are run simultaneously down a well on a tubing string (16), and the gun (54) fired under underbalance conditions. A slip joint (35) reduces vertical mechanical shock transmitted through the tubing string (46) to the pump (34) on firing: centralisers (56, 58) minimize whiplash vibration, and lateral shock absorber (60) absorbs radial shock.
摘要:
Apparatus for perforating a well casing (6) containing fluid therein and for controlling the flow of fluids into said apparatus from said casing and from an earth formation behind the casing, comprises a conduit string (4) extending from the top of said well thereinto; packing means (12) set in said casing in said well dividing said casing into an upper portion located above said packer means and a lower portion located below said packer means; vent means (8) located below said packer means in said lower portion of said well and connected to said packer means, said vent means being in an initially closed position preventing the flow of fluid into said apparatus; and actuating means (10) connected to said conduit string and located above said packer in said upper portion of said well, said actuating means having a portion thereof engaging said packer means and a portion thereof for actuating said vent means for allowing the flow of fluid into said apparatus, said actuating means responsive to the differential in fluid pressure of said fluid within said casing above said packer means in the annulus between the interior of said casing and the exterior of said conduit string and the fluid pressure of the fluid within said apparatus.
摘要:
Apparatus for attenuating a shock in a tool string, such as from an explosive, includes a body (28) which is inextensible, the body having means (34,36) for connecting it serially in a tool string, and an intermediate section (38) for undergoing plastic deformation to dissipate the shock energy. In a particular embodiment, the plastic deformation and serial energy dissipation occur in a hollow unitary body (28) having a cylindrical wall in which are defined a plurality of longitudinally spaced circumferential grooves (42).
摘要:
Apparatus for perforating a well casing (6) containing fluid therein and for controlling the flow of fluids into said apparatus from said casing and from an earth formation behind the casing, comprises a conduit string (4) extending from the top of said well thereinto; packing means (12) set in said casing in said well dividing said casing into an upper portion located above said packer means and a lower portion located below said packer means; vent means (8) located below said packer means in said lower portion of said well and connected to said packer means, said vent means being in an initially closed position preventing the flow of fluid into said apparatus; and actuating means (10) connected to said conduit string and located above said packer in said upper portion of said well, said actuating means having a portion thereof engaging said packer means and a portion thereof for actuating said vent means for allowing the flow of fluid into said apparatus, said actuating means responsive to the differential in fluid pressure of said fluid within said casing above said packer means in the annulus between the interior of said casing and the exterior of said conduit string and the fluid pressure of the fluid within said apparatus.
摘要:
A compensator 1 for supporting an explosive severing device 2 in a bore hole 3 below a well head (not shown) and for damping forces arising on explosion of the explosive severing device 2 in the bore hole. The compensator 1 comprises two parts 4 (Figs. 1 to 4) and 5 (Figs. 5 and 6) mounted for relative longitudinal slidable motion. One part 4 has means 6 for supporting the explosive device 2 in the bore hole 3, and at least one of the parts (in this case both parts 4 and 5) has means in the form of through holes 7 for dissipating laterally, upwardly directed forces arising on explosion of the device in the bore hole.
摘要:
A technique facilitates mitigation of shock loads. Subterranean communication systems may comprise components susceptible to various shock loads. A shock mitigation system (30) is physically coupled with the subterranean communication system (28) to mitigate such shock loads. The shock mitigation system (30) comprises components selected to enable reduction of various effects of shock loads, e.g. shock loads resulting from perforating procedures, which could otherwise be detrimental to continued operation of the subterranean communication system.
摘要:
A technique facilitates mitigation of shock loads. Subterranean communication systems may comprise components susceptible to various shock loads. A shock mitigation system (30) is physically coupled with the subterranean communication system (28) to mitigate such shock loads. The shock mitigation system (30) comprises components selected to enable reduction of various effects of shock loads, e.g. shock loads resulting from perforating procedures, which could otherwise be detrimental to continued operation of the subterranean communication system.