A system and method and apparatus includes a cylinder having corresponding end caps and wherein each end cap includes at least one corresponding gas port and a floating piston disposed within the cylinder, the floating piston including at least one seal, the at least one seal being operative to form a seal between the floating piston and an inner surface of the cylinder.

A liquid suction pump comprising: a drive pipe to receive a liquid drive flow for the pump; a liquid conduit with first and second liquid delivery arms to provide pumped liquid, and a connecting valve arrangement between the arms. First and second pump inlets to the arms have respective first and second one-way inlet valves. The valve arrangement has a valve inlet coupled to the drive pipe and valve outlets coupled to the arms to alternately close off a liquid connection between the valve inlet and respective arms. A compliant element is coupled to the drive pipe. The drive flow oscillates in pressure/flow rate due to alternate switching of the valves. A compliance of the compliant element is such that a geometry of the suction pump in combination with the compliance defines a resonant condition, and the oscillation is at a resonant frequency of the pump.

The device (100) for compressing a low-pressure gas comprises: at least one compression chamber (105) comprising: an inlet (110) for low-pressure gas, an outlet (115) for high-pressure gas, an inlet (120) for fluid, an outlet (125) for fluid, and a piston (130) located between the gas inlet and outlet, on the one hand, and the fluid inlet and outlet, on the other hand; a fluid movement means (135) positioned on a fluid circuit connecting a fluid outlet and a fluid inlet of a compression chamber; and a means (165) for measuring the gas pressure inside the compression chamber and a circuit (160) to recirculate gas to the inlet of a compression chamber when the measured pressure is less than a predefined limit value.

The device (100) for compressing a low-pressure gas comprises: at least one compression chamber (105) comprising: an inlet (110) for low-pressure gas, an outlet (115) for high-pressure gas, an inlet (120) for fluid, an outlet (125) for fluid, and a piston (130) located between the gas inlet and outlet, on the one hand, and the fluid inlet and outlet, on the other hand; a fluid movement means (135) positioned on a fluid circuit connecting a fluid outlet and a fluid inlet of a compression chamber; and a means (165) for measuring the gas pressure inside the compression chamber and a circuit (160) to recirculate gas to the inlet of a compression chamber when the measured pressure is less than a predefined limit value.

An improved free piston assembly for use in combination with a plunger lift assembly is provided. The piston assembly includes a sleeve member, a retention sleeve, and a flow restriction member. The sleeve member has an inner surface defining an opening for the flow of formation fluids. The opening includes a first section and a second section. The retention sleeve is configured to be affixed to the first section of the opening. The flow restriction member is not latched to the sleeve member and is configured to have an interference fit with the retention sleeve. The interference fit provides a force that is sufficient to overcome the force of gravity on the flow restriction member when formation fluid forces acting on the flow restriction member are decreased or removed. The second section of the opening is configured to prevent the passage of the flow restriction member.

An improved free piston assembly for use in combination with a plunger lift assembly is provided. The piston assembly includes a sleeve member, a retention sleeve, and a flow restriction member. The sleeve member has an inner surface defining an opening for the flow of formation fluids. The opening includes a first section and a second section. The retention sleeve is configured to be affixed to the first section of the opening. The flow restriction member is not latched to the sleeve member and is configured to have an interference fit with the retention sleeve. The interference fit provides a force that is sufficient to overcome the force of gravity on the flow restriction member when formation fluid forces acting on the flow restriction member are decreased or removed. The second section of the opening is configured to prevent the passage of the flow restriction member.

An improved free piston assembly for use in combination with a plunger lift assembly is provided. The piston assembly includes a sleeve member, a retention sleeve, and a flow restriction member. The sleeve member has an inner surface defining an opening for the flow of formation fluids. The opening includes a first section and a second section. The retention sleeve is configured to be affixed to the first section of the opening. The flow restriction member is not latched to the sleeve member and is configured to have an interference fit with the retention sleeve. The interference fit provides a force that is sufficient to overcome the force of gravity on the flow restriction member when formation fluid forces acting on the flow restriction member are decreased or removed. The second section of the opening is configured to prevent the passage of the flow restriction member.

An improved free piston assembly for use in combination with a plunger lift assembly is provided. The piston assembly includes a sleeve member, a retention sleeve, and a flow restriction member. The sleeve member has an inner surface defining an opening for the flow of formation fluids. The opening includes a first section and a second section. The retention sleeve is configured to be affixed to the first section of the opening. The flow restriction member is not latched to the sleeve member and is configured to have an interference fit with the retention sleeve. The interference fit provides a force that is sufficient to overcome the force of gravity on the flow restriction member when formation fluid forces acting on the flow restriction member are decreased or removed. The second section of the opening is configured to prevent the passage of the flow restriction member.

Disclosed is an ultrahigh-pressure homogenizing integrated device and a cell disruptor. The ultrahigh-pressure homogenizing integrated device includes a long oil cylinder, a main connecting sleeve, a high-pressure cylinder homogenizing main body, an auxiliary connecting sleeve and a short oil cylinder, which are sequentially and coaxially arranged. An upper part of the high-pressure cylinder homogenizing main body is provided with a feeding hole communicated with a high-pressure cavity; and the feeding hole is connected with an integrated feeding device. A pressurizing plunger rod in the high-pressure cavity of the high-pressure cylinder homogenizing main body is connected with a piston rod of the long oil cylinder; and a homogenizing valve arranged in the inner cavity, which is communicated with the high-pressure cavity, of the high-pressure cylinder homogenizing main body, is connected with an ejector rod of the short oil cylinder.

Disclosed is an ultrahigh-pressure homogenizing integrated device and a cell disruptor. The ultrahigh-pressure homogenizing integrated device includes a long oil cylinder, a main connecting sleeve, a high-pressure cylinder homogenizing main body, an auxiliary connecting sleeve and a short oil cylinder, which are sequentially and coaxially arranged. An upper part of the high-pressure cylinder homogenizing main body is provided with a feeding hole communicated with a high-pressure cavity; and the feeding hole is connected with an integrated feeding device. A pressurizing plunger rod in the high-pressure cavity of the high-pressure cylinder homogenizing main body is connected with a piston rod of the long oil cylinder; and a homogenizing valve arranged in the inner cavity, which is communicated with the high-pressure cavity, of the high-pressure cylinder homogenizing main body, is connected with an ejector rod of the short oil cylinder.