Abstract: The present invention provides an oil and gas reservoir electronic logging overflow safety control wireline hanger which comprises a body (1) and a wireline clamping apparatus. Threads (5) are provided on a part of the outer surface of the upper end of the body (1). An entry opening (12) extending along a vertical direction is provided in the body (1) to receive the wireline. A tapering-down, truncated cone shaped passage (2) is provided inside the body (1). A detachable support apparatus (9) is fixed on the upper part of the body (1). The wireline clamping apparatus comprises two wedges (3), and each has a sector shaped cross-section and tapering-down truncated cone shape corresponding to the passage (2). The wedges are symmetrically fixed inside the passage (2) so that a wireline hole (4), with a diameter less than that of the wireline, is formed between the two wedges (3).

Abstract: Disclosed is a method for extracting high acyl gellan from the fermentation broth containing gellan gum with a low production cost and high quality of products, comprising the following steps: (1) Treatment of the fermentation broth with an enzyme; (2) flocculation of the treated fermentation broth with acid; (3) wash of the fiber-like material; and (4) drying and milling.

Abstract: The present invention provides an oil and gas reservoir electronic logging overflow safety control wireline hanger which comprises a body (1) and a wireline clamping apparatus. Threads (5) are provided on a part of the outer surface of the upper end of the body (1). An entry opening (12) extending along a vertical direction is provided in the body (1) to receive the wireline. A tapering-down, truncated cone shaped passage (2) is provided inside the body (1). A detachable support apparatus (9) is fixed on the upper part of the body (1). The wireline clamping apparatus comprises two wedges (3), and each has a sector shaped cross-section and tapering-down truncated cone shape corresponding to the passage (2). The wedges are symmetrically fixed inside the passage (2) so that a wireline hole (4), with a diameter less than that of the wireline, is formed between the two wedges (3).

Abstract: The present invention relates to a post extraction process for preparing low acyl gellan, comprising the steps: deacylation treatment of gellan gum-containing fermentation broth, enzyme treatment, flocculation of low acyl gellan gum with divalent or polyvalent metal cations, clarification treatment of gellan gum solution, dehydration treatment of gellan gum solution, removal of divalent or polyvalent cations and decoloration, and drying and milling. Preferably, the process comprises the step of formulating a proper amount of chelating agent/acid system before the drying and milling step to chelate the added additional divalent cations added during the use of gellan gum, and at the same time to keep the pH value in a relatively stable condition. The present invention also provides the various low acyl gellan gums prepared by the above methods. The product has the following characteristics: a good appearance, a high transmittancy, and high gel strength.

Abstract: The present invention relates to a post extraction process for preparing low acyl gellan, comprising the steps: deacylation treatment of gellan gum-containing fermentation broth, enzyme treatment, flocculation of low acyl gellan gum with divalent or polyvalent metal cations, clarification treatment of gellan gum solution, dehydration treatment of gellan gum solution, removal of divalent or polyvalent cations and decoloration, and drying and milling. Preferably, the process comprises the step of formulating a proper amount of chelating agent/acid system before the drying and milling step to chelate the added additional divalent cations added during the use of gellan gum, and at the same time to keep the pH value in a relatively stable condition. The present invention also provides the various low acyl gellan gums prepared by the above methods. The product has the following characteristics: a good appearance, a high transmittancy, and high gel strength.

Abstract: Disclosed is a method for extracting high acyl gellan from the fermentation broth containing gellan gum with a low production cost and high quality of products, comprising the following steps: (1) Treatment of the fermentation broth with an enzyme; (2) flocculation of the treated fermentation broth with acid; (3) wash of the fiber-like material; and (4) drying and milling.