Study Of In-depth Profile Control And Adaptability In Conglomerate Reservoir In Karamay Oilfield

Due to the special nature of the conglomerate reservoir, in recent years, scientists have done a lot of research to conglomerate reservoir, including deep profile control technology as an advanced tertiary oil recovery method is widely used.Oilfield produced water were (especially water injection development of oilfields) common problem in the development process, water plugging and profile control technology has been oilfield water injection to Improve the effect of oil field development and an effective means of reservoir stable. But conventional water plugging and profile control technology, due to the high concentration of chemicals in the system, Gelling speed fast, can only improve the water injection profile and production profile in the vicinity of the wellbore. A large number of laboratory experiments and field tests show that to solve the crossflow and flow around the problem, and further improve recovery, the need for deep profile control.After years of study of the large number of scholars, In-depth drive technology much has been achieved in the tune flooding agent development, construction technology and mechanism of providing effective technical support for the oil field to maintain efficient development. With the oil field water flooding the continuous improvement of the level of development, the development faced by the various contradictions become more prominent, deep tone for different formation conditions and the exploitation phase drive chemical agents and the corresponding process technology required to improve. This requires researchers to continue to carry out a lot of research work.Currently,deep profile control measures carried out by Karamay Oilfield polymer gel system hold a dominant position and therefore to carry out the conglomerate reservoir with polymer gel In-depth drive system adaptability research, proven polymer gel in the conglomerate reservoir percolation behavior and strength and core porosity and permeability adaptability, development flooding agent has a good performance and compatibility surfactant has great scientific significance, the project’s research conglomerate reservoir In-depth drive system of choice, the injection volume and construction parameters design has important guiding significance.In this paper,Badaowan Formation in QizhongDong Area reservoir step deep profile for research purposes. Conglomerate Reservoir-Seventh district oilfield reservoir geological characteristics and development status quo extensive field investigation and sampling information and on-site analysis and feasibility studies, proposed "stepwise deep profile control and displacement method". Evaluated and screened polymer formation salinity conditions polymer gel performance, best polymer gel system. Polymer gel system, through a lot of physical model experiments to study the transfer drive system dynamic and static gelling and Mobility, the polymer gel formulations and permeability matching relations and migration characteristics of the cores optimized control and oil displacement technology parameters; Finally, the flooding experiments has been optimized injection volume, proposed deep profile control and displacement method in Badaowan Formation in QizhongDong Area of Karamay oilfiled, the findings are as follows:1analysis the Badaowan Formation in QizhongDong Area reservoir injection water quality, injection wate salinity22893.15mg/L of the area, the total amount of calcium and magnesium ions430.15mg/L. taking into account the area water quality and the formation temperature, The intended application of the block of two polymer gel system gelling properties of static and dynamic. For organic chromium cross-linked system, Static gelling time is adjustable in20to36hours. For phenol-aldehyde system, static gelling time may be extended to60h. under oscillation conditions, the two sol gel time was extended into a gel strength decreased, the same polymer concentration of phenol-aldehyde system into a gel strength is lower than the organic chromium system. As the oscillation speed increases, the cross-linking system into the adhesive is getting smaller and smaller; organic chromium cross-linking system in150r/min’s speed basic can gel; when the speed reaches100to150r/min, phenol-aldehyde system not into gel.2Polymer cross-linked system in the static and dynamic of the cores into gel and spread not only the initial viscosity of the polymer gel, and the core permeability, strength and permeability matching exists, obtained polymer gel formulations and permeability of Matching relationship. For the core permeability about0.5μm2, optional0.1%polymer phenol-aldehyde system; for core penetration in about1μm2,the optional0.2%chromium polymer cross-linked system or0.2%polymer phenol-aldehyde system; for core penetration in about3μm2,the optional0.2%chromium polymer cross-linked system or0.3%polymer phenol-aldehyde system; for core penetration in about5μm2,the optional0.3%chromium polymer cross-linked system; for core penetration in about7μm2, polymer cross-linked system can not be used alone as profile control slug.3Analysis of the transport properties of the polymer gel system in the core. For gel matched permeability, sol with good liquidity, after gelling can be moved-and can effectively plug the back-end. 4By flooding experiments to obtain the optimum injection volume. The lower permeability, the larger for the enhanced oil recovery for the organic chromium polymer cross-linked system drive; the same formula polymer concentration, low permeability core gel system of viscoelastic vortex displacement effect more obvious. The displacement effect of the gel system plays a major role in the high injection volume, the gel in the subsequent water-drive under the action of the migration changed the formation micro-pressure field distribution, the microscopic change in the formation pore residual oil adhesive Power distribution, destruction of oil droplets force balance, and promote the flow of residual oil. The combined injection pressure increases、 percolation behavior parameters and secondary water flooding process EOR, from the economic point of view, the injection volume was0.3-0.5PV more appropriate.5In this paper experiment research of the same type of the reservoir (conglomerates reservoir) enhanced oil recovery ways and methods, and for the conglomerate reservoir development provide technical reserves.