VARIABLE SLIPPAGE PUMP

VARIABLE SLIPPAGE PUMP

Dover Artificial Lift, part of Dover Energy, is a team of industry-leading companies that utilize their collective resources to help oil & gas producers optimize revenues, profitability, safety and environmental compliance through high-quality production, completion, gathering and control systems. Dover Artificial Lift delivers the latest technologies, innovations and solutions in rod lift, plunger lift, gas lift, hydraulic lift, progressing cavity pump, surface production equipment, well site controls and analytic tools. Our expanding production offering consists of brands with industryleading quality, performance and reputation. 2

Variable Slippage Pump (VSP) Equalize Pressure. Eliminate Gas Lock. Enhance Production. Harbison-Fischer is the global leader in downhole reciprocating pumps and related equipment for the upstream oil and gas market. We are proud to be the industry leader in service, quality and technology for more than seven decades. The patented Variable Slippage Pump is a sucker-rod-drawn, positivedisplacement pump which operates on the principle of pressure equalization just before the plunger reaches the top of the upstroke. Existing pump designs rely on the ability of the pump to produce high pressure in the compression chamber during the downstroke. This high pressure is needed to open the traveling valve and allow fluid and gas to flow through the plunger for lifting to the surface on the upstroke. Failure of the traveling valve to open on the downstroke in gassy wells causes a gas locked condition and no production. The VSP has a gradual taper in the upper barrel. As the plunger enters this taper near the top of the upstroke, slippage increases past the plunger, and pressure is equalized above and below the plunger and traveling valve. As a result, when the plunger starts downward, the traveling valve opens easily since high pressure in the compression chamber has already been achieved. Designed specifically to prevent the productionhalting, and revenue-damaging, gas lock condition in pumping systems Increased minimum polished-rod load allows for greater sucker-rod life, a reduction in necessary interventions and greater pump uptimes Available in abrasion and corrosion-resistant materials and coatings, to ensure maximum product durability and lifespan 3

The Variable Slippage Pump Advantage The VSP is designed to eliminate Gas Pound and Gas Lock conditions How a Typical Downhole Pump Works Gas Pound Gas Lock Gas Pound occurs when the level of gas in a pump causes ineffective compression below the plunger. When this gas is compressed to a certain point, it will violently meet with the liquid in the pump, causing a production-damaging hydraulic shock to reverberate through the system. Gas Lock occurs when so much gas is present below a pump s plunger that it becomes impossible to achieve proper compression. As a result, the pump s traveling valve cannot open and production is completely halted. Typical pumps aren t designed to address gas pound or lock. As a result, any gas that enters the pump can accumulate, making it increasingly difficult for the pump to achieve ideal fluid compression, internal pressure or production. PAIN POINTS Gas lock and gas pound, which are common conditions in gassy well environments, can greatly reduce or even stop a well s production. When gas enters a pump, it cannot effectively compress fluid on its downstroke, which prevents it from being carried to the surface. If fluid cannot reach the surface, production can be inefficient or nonexistent. OUR SOLUTION RESULTS By actively combating gas lock and gas pound, the VSP promotes steady, consistent production, a higher average production rate, and increased well profit. This is especially true in gassy well environments, which face substantial risk of inefficient or halted production due to gas lock. 4 The VSP actively counteracts gas lock and gas pound during its normal operation by allowing a small amount of fluid to slip back down the pump on its upstroke. This fluid mixes with any gas in the pump, equalizing pressure, and allows the pump to compress fluid effectively. While this fluid slippage slightly decreases maximum production, it allows for a steadier production rate, and higher net production.

How the VSP Works In typical pumps, gas can accumulate in the cavity below the plunger. This makes it impossible for the pump to compress properly. In the VSP, fluid is able to slip from above the plunger down into the cavity below. This fluid helps equalize pressure and allows the pump to maintain efficient production. The tapered barrel at the top of the VSP allows a small amount of fluid to slip back down into the pump during its upstroke. This fluid then enters the cavity below the plunger and mixes with the gas to equalize the pressure in the pump. This allows the pump to maintain compression and steady production. ELIMINATES GAS LOCK & GAS POUND The VSP s tapered barrel equalizes in-pump pressure during its upstroke to allow for compression and production, preventing gas lock or gas pound. CUSTOM BUILT Each VSP pump is built to meet the specific needs of the well in which it will be installed, enhancing product lifespan and efficiency. SEAMLESS FIT Industry-standard components allow the VSP to fit into nearly any well and make for a simple installation process. CLIENT SATISFACTION Almost 100% of VSP customers re-order the product when the equipment reaches the end of its lifespan or for their other wells. EFFICIENCY FOCUSED The VSP is designed to promote steady and consistent production, especially in gassy wells. LONGEVITY The VSP s increased minimum load on the polished rod allows for enhanced sucker rod life. 5

Technical Specs 8 Variable Slippage Pump (VSP) pump is available in all standard configurations of sucker-rod pumps that are compatible with spraymetal plungers. For severe sand conditions that will stick to the pump it is recommended to use a Top Sand Seal. Part Number Tubing Size & Pump Bore 9 Item Description No. Req d. 2-3/8" x 1-1/16" 2-3/8" x 1-1/4" 2-7/8" x 1-1/2" 2-7/8" x 1-3/4" 1 Bushing, Valve Rod 1 60E2 60K2 60K2 60L2 1 2 Rod, Valve 1 65E* 65K* 65K* 65K* 10 Plunger Assembly 3 Coupling, Top Plunger 1 4-84B1 4-84C5 4-84E2 4-84H1 4 Plunger 1 60-252B* 60-252C* 60-252E* 60-252H* 5 Cage, Closed Plunger 1 4-131B2-45 22-903C2-45 22-903E2-45 22903H2-45 2 6 Ball & Seat 1 2B4 2C2 2E2 2H2 7 Plug Seat 1 1-146B11 1-146C11 1-146E11 1-146H11 8 Guide, Rod 1 72E1 72E12 72K1 72K1 9 Coupling, Extension 1 527B3* 527C* 527E* 527H* 11 10 Barrel, VSP 1 416-5504 416-5501 416-5502 416-5503 3 Barrel Assembly 11 Barrel 1 426B3* 426C* 426E* 426H* 12 Coupling, Extension 1 527B3* 527C* 527E* 527H* 13 Cage, Closed Barrel 1 22-358E22-45 22-358E22-45 22-358K22-45 22-358K22-45 12 14 Ball & Seat 1 2H2 2H2 2L2 2L2 13 14 15 16 4 Seating Assembly, 3-cup 15 Mandrel 1 95H1 95H1 95L1 95L1 16 Cup, Seating 3 180-190J+30 180-190J+30 180-190L+70 180-190L+70 17 Spacer 2 175H1 175H1 175L1 175L1 18 Locknut 1 156H1 156H1 156L1 156L1 19 Coupling 1 163H21 163H21 163L21 163L21 17 18 19 5 6 7 Seating Nipple Nipple, Seating 1 299K312 299K312 299M312 299M312 * Specify the following: - Barrel length (feet) - Extension length (inches) - Plunger length (feet) and minus size (in thousands of an inch) - Valve rod or pull tube length (inches) Nipple I.D. 1 1.780" 1.780" 2.280" 2.280 6

Tubing Size 2-3/8" 2-3/8" 2-7/8" 2-7/8 Pump Bore 1-1/16" 1-1/4" 1-1/2" 1-3/4" Bore Factor.132.182.262.357 Barrel O.D. 1.437 1.625 1.875 2.125 Extension O.D. 1.750 1.750 2.250 2.250 7

To learn more about the Harbison-Fischer Variable Slippage Pump (VSP), visit: www.doverals.com 202.1