Magnetic suspension densimeter including means to vary float volume and weight专利检索-电流测量探头传感器与探测器专利检索查询-专利查询网

Magnetic suspension densimeter including means to vary float volume and weight

阅读：526发布：2022-05-10

专利汇可以提供Magnetic suspension densimeter including means to vary float volume and weight专利检索，专利查询，专利分析的服务。并且An illustrative embodiment of the present invention includes methods and apparatus for making in situ determinations of the density or specific gravity of fluids in a well borehole. A magnetically suspendable float type densimeter carried on a sonde is suspended in the borehole and a series of three measure currents to the suspension coils made. A first measure of the float together with an internal and an external inertia block is combined with second and third measures made with only the internal inertia block and then only the external inertia block influencing the measure current. The three measure current signals are then combined to derive a signal proportional to the fluid density which may be recorded as a function of borehole depth.，下面是Magnetic suspension densimeter including means to vary float volume and weight专利的具体信息内容。

权利要求

1. A process for measuring in situ the density or specific gravity of fluids in a well borehole comprising the steps of: passing a magnetically suspendable float member through the fluid filled borehole; providing a sequence of at least three suspension currents through the suspension coils of said magnetically suspendable float member while simultaneously varying the apparent weight and then the apparent weight and volume of said float member; measuring said three suspension current to provide signals representative of the current required to suspend said float member against the forces of buoyancy and gravity in at least three weight, volume configurations; and combining said representative signals to generate a signal representative of the density or specific gravity of the borehole fluid.

2. The method of claim 1 wherein the steps are repeated successively at different depth levels in the borehole and the density or specific gravity signal is recorded as a function of the depth of the float in the borehole.

3. The process of claim 1 wherein the step of varying the apparent weight and volume of said float member is performed by magnetically suspending a portion of said float member which is exposed to the borehole fluid independently of the remainder of said float member.

4. The process of claim 1 wherein the step of varying the apparent weight of said float member is performed by magnetically suspending a portion of said float member which is not exposed to the borehole fluid independently of the remainder of said float member.

5. The method of claim 1 wherein the step of combining said representative signals to generate a signal representative of the density or specific gravity of the borehole fluid is performed by forming a linear combination of the three signals representative of the suspension current in the three different weight, volume configurations.

6. Apparatus for measuring in situ the density or specific gravity of fluids in a well borehole comprising: a body member sized for passage in a well bore; a magnetically suspendable float member carried by said body member and exposed to the buoyant action of the borehole fluid and mounted for axial motion relative to said body member; means for varying simultaneously the weight and volume of said float member; means for varying the weight alone of said float member; means for measuring the suspension current necessary to suspend said float member in at least three different weight, volume configurations in the borehole fluid and for generating signals representative Thereof; and means for combining said representative signals to provide an output signal representative of the density or specific gravity of the borehole fluid.

7. The apparatus of claim 6 and further including means for moving said body member through the borehole and for recording said output signal as a function of depth in the borehole.

8. The apparatus of claim 6 wherein said means for simultaneously varying the weight and volume of said float member comprises magnetic inertia block means coupled to said member and exposed to the borehole fluid but adapted for movement with respect to said float member and means for supplying magnetic forces to independently suspend said inertia block and to thereby decouple it from said float member.

9. The apparatus of claim 8 wherein the mean composite density of said inertia block is as small as possible.

10. The apparatus of claim 6 wherein said means for varying the weight alone of said float member comprises magnetic inertia block means coupled to said member and not exposed to the borehole fluid but adapted for movement with respect to said float member, and means for supplying magnetic forces to independently suspend said inertia block and to thereby decouple it from said float member.

11. The apparatus of claim 6 wherein said magnetically suspendable float member is suspendable by a magnetic field produced in plural suspension windings, said suspension windings being arranged so that the current required to pass therethrough for suspending said float member is a linear function of the apparent weight of said float member in the borehole fluid.

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