Due to the high viscosity of crude oil in well with heavy heavy oil, relatively poor quality of crude oil and poor performance of conventional water injection, the technical staff of Gudong Oil Production Plant in Shengli Oilfield has been proved via feasibility and field test in the past half year, Widely used to prove that the process of mining scattered heavy oil blocks have better adaptability and achieved good results.
Hydraulic jet pump structure: Hydraulic jet pump into the pump seat, pump two parts. Pump core is divided into lifting assembly, pump and pressure measuring parts of three parts. The core of the pump core is the nozzle, throat and diffuser. Pump down to the design depth with the tubing. Pump core can be positive and negative power cycle through the liquid to achieve the purpose of investment and promotion.
Hydraulic jet pump works: Hydraulic jet pump is based on Venti principle of work, that is, high pressure hydrodynamic fluid, after flow control and metering, down from the wellhead along the tubing, pump down to reach the hydraulic pump drive jet pump work; when the high pressure fluid Through the nozzle, due to the throttling effect of the nozzle, the pressure drops sharply around the nozzle to form a low pressure zone. The submerged pressure enters the "negative pressure" zone of the jet pump under the action of submerged pressure and enters into the throat pipe after being mixed with the adjusting jet at the exit of the nozzle. Diffuser. In the throat, diffuser, formation fluid from the high-pressure fluid to obtain energy, the energy can be converted to pressure energy, the pressure value of the mixture along the tubing annular space raised to the ground.
The advantages and disadvantages of hydraulic jet pump production process:
Advantages: there is no partial wear phenomenon, the power fluid temperature is high (above 70 ℃), easy to handle, the treated power fluid will not corrode the tubular structure phenomenon, the process of some sand carrying oil production, easy management, inspection Piston pump can be washed out by the power, saving operating costs.
Disadvantages: Ground supporting the need for 2 sets of power pumps, requires 50 cubic meters of storage tank two, covers an area larger.
Hydraulic jet pump production process is a rodless oil production method, there is no sucker rod, high corrosive wells and eccentric partial wear serious wells, there is no wear of the rod tube to overcome the sucker rod eccentric wear and sucker off The occurrence of such phenomena. Its main components are made of wear-resistant and corrosion-resistant materials. The main part of the pump core is made of high-quality stainless steel. The niobium alloy is used as the nozzle, which fundamentally solves the problem of formation fluid corrosion and can greatly improve the service life of the pump. At the same time, jet pump hydrodynamic salinity of 6000-7000 mg / L, play a dilution of formation fluid, extending the life of the tubing.
For shallow depth of reservoir, high original formation pressure, higher formation permeability, and strong liquid supply well, it ensures high suction pressure for jet pump production and adapts to the characteristics of large liquid extraction range.
Hydraulic jet pump compact structure, the ground flow is simple, easy to construct, high reliability, the quality of the power fluid is not high. Because there is no contact between the well fluid and the pump barrel, the applicability of the sand well is strong. It has the advantages of ordinary technology not replaceable by the oil pump. The site is easy to implement, easy to operate and has no environmental pollution. And, with the deepening research and understanding of jetting technology, the existing jetting technology has not only been applied in many non-direct oil fields such as downhole oil production, drainage of acid in the underground, Has also been widely used.
Gudong Oilfield KD641 block oil area of ​​1.45 square kilometers, the effective thickness of 9.1 meters, 2.6 million tons of petroleum geology. The KD641 oil well has scattered distribution of oil-bearing sand bodies, with a small sandstone distribution area with an average porosity of 35.9% and a permeability of 1.08 Darcy. It is a heavy oil reservoir with high porosity and high permeability. The block is shallow in oil reserves with a reservoir depth of 1334-1418 meters and a ground viscosity of about 8163 millipascal / second. The 7-port water jet pump well in this block has achieved a success rate and efficiency of 100% since its full operation in November 2006. The average daily well water per well is 17.2t / d, the daily oil is 8.3t / d and the water content is 51.9% , Achieved a better development results.
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